Whether to expand in both directions. Setting this sets both #GtkWidget:hexpand and #GtkWidget:vexpand
Whether the widget should grab focus when it is clicked with the mouse.
This property is only relevant for widgets that can take focus.
Before 3.20, several widgets (GtkButton, GtkFileChooserButton, GtkComboBox) implemented this property individually.
How to distribute horizontal space if widget gets extra space, see #GtkAlign
Enables or disables the emission of #GtkWidget::query-tooltip on widget.
A value of %TRUE indicates that widget can have a tooltip, in this case
the widget will be queried using #GtkWidget::query-tooltip to determine
whether it will provide a tooltip or not.
Note that setting this property to %TRUE for the first time will change the event masks of the GdkWindows of this widget to include leave-notify and motion-notify events. This cannot and will not be undone when the property is set to %FALSE again.
Whether to expand horizontally. See gtk_widget_set_hexpand().
Whether to use the #GtkWidget:hexpand property. See gtk_widget_get_hexpand_set().
Sets all four sides' margin at once. If read, returns max margin on any side.
Margin on bottom side of widget.
This property adds margin outside of the widget's normal size request, the margin will be added in addition to the size from gtk_widget_set_size_request() for example.
Margin on end of widget, horizontally. This property supports left-to-right and right-to-left text directions.
This property adds margin outside of the widget's normal size request, the margin will be added in addition to the size from gtk_widget_set_size_request() for example.
Margin on left side of widget.
This property adds margin outside of the widget's normal size request, the margin will be added in addition to the size from gtk_widget_set_size_request() for example.
Margin on right side of widget.
This property adds margin outside of the widget's normal size request, the margin will be added in addition to the size from gtk_widget_set_size_request() for example.
Margin on start of widget, horizontally. This property supports left-to-right and right-to-left text directions.
This property adds margin outside of the widget's normal size request, the margin will be added in addition to the size from gtk_widget_set_size_request() for example.
Margin on top side of widget.
This property adds margin outside of the widget's normal size request, the margin will be added in addition to the size from gtk_widget_set_size_request() for example.
The maximum number of lines to allow per column. This property can be used to influence how the groups in this section are distributed across pages and columns. The default value of 15 should work in for most cases.
The requested opacity of the widget. See gtk_widget_set_opacity() for more details about window opacity.
Before 3.8 this was only available in GtkWindow
The orientation of the orientable.
The scale factor of the widget. See gtk_widget_get_scale_factor() for more details about widget scaling.
A unique name to identify this section among the sections added to the DzlShortcutsWindow. Setting the #DzlShortcutsWindow:section-name property to this string will make this section shown in the DzlShortcutsWindow.
The style of the widget, which contains information about how it will look (colors, etc).
The string to show in the section selector of the DzlShortcutsWindow for this section. If there is only one section, you don't need to set a title, since the section selector will not be shown in this case.
Sets the text of tooltip to be the given string, which is marked up with the [Pango text markup language][PangoMarkupFormat]. Also see gtk_tooltip_set_markup().
This is a convenience property which will take care of getting the tooltip shown if the given string is not %NULL: #GtkWidget:has-tooltip will automatically be set to %TRUE and there will be taken care of #GtkWidget::query-tooltip in the default signal handler.
Note that if both #GtkWidget:tooltip-text and #GtkWidget:tooltip-markup are set, the last one wins.
Sets the text of tooltip to be the given string.
Also see gtk_tooltip_set_text().
This is a convenience property which will take care of getting the tooltip shown if the given string is not %NULL: #GtkWidget:has-tooltip will automatically be set to %TRUE and there will be taken care of #GtkWidget::query-tooltip in the default signal handler.
Note that if both #GtkWidget:tooltip-text and #GtkWidget:tooltip-markup are set, the last one wins.
How to distribute vertical space if widget gets extra space, see #GtkAlign
Whether to expand vertically. See gtk_widget_set_vexpand().
Whether to use the #GtkWidget:vexpand property. See gtk_widget_get_vexpand_set().
A view name to filter the groups in this section by. See #DzlShortcutsGroup:view.
Applications are expected to use the #DzlShortcutsWindow:view-name property for this purpose.
The widget's window if it is realized, %NULL otherwise.
For widgets that can be “activated” (buttons, menu items, etc.)
this function activates them. Activation is what happens when you
press Enter on a widget during key navigation. If widget isn't
activatable, the function returns %FALSE.
Adds widget to container. Typically used for simple containers
such as #GtkWindow, #GtkFrame, or #GtkButton; for more complicated
layout containers such as #GtkBox or #GtkGrid, this function will
pick default packing parameters that may not be correct. So
consider functions such as gtk_box_pack_start() and
gtk_grid_attach() as an alternative to gtk_container_add() in
those cases. A widget may be added to only one container at a time;
you can’t place the same widget inside two different containers.
Note that some containers, such as #GtkScrolledWindow or #GtkListBox, may add intermediate children between the added widget and the container.
Installs an accelerator for this widget in accel_group that causes
accel_signal to be emitted if the accelerator is activated.
The accel_group needs to be added to the widget’s toplevel via
gtk_window_add_accel_group(), and the signal must be of type %G_SIGNAL_ACTION.
Accelerators added through this function are not user changeable during
runtime. If you want to support accelerators that can be changed by the
user, use gtk_accel_map_add_entry() and gtk_widget_set_accel_path() or
gtk_menu_item_set_accel_path() instead.
widget signal to emit on accelerator activation
accel group for this widget, added to its toplevel
GDK keyval of the accelerator
modifier key combination of the accelerator
flag accelerators, e.g. %GTK_ACCEL_VISIBLE
Adds the events in the bitfield events to the event mask for
widget. See gtk_widget_set_events() and the
[input handling overview][event-masks] for details.
an event mask, see #GdkEventMask
Adds a widget to the list of mnemonic labels for this widget. (See gtk_widget_list_mnemonic_labels()). Note the list of mnemonic labels for the widget is cleared when the widget is destroyed, so the caller must make sure to update its internal state at this point as well, by using a connection to the #GtkWidget::destroy signal or a weak notifier.
Queues an animation frame update and adds a callback to be called before each frame. Until the tick callback is removed, it will be called frequently (usually at the frame rate of the output device or as quickly as the application can be repainted, whichever is slower). For this reason, is most suitable for handling graphics that change every frame or every few frames. The tick callback does not automatically imply a relayout or repaint. If you want a repaint or relayout, and aren’t changing widget properties that would trigger that (for example, changing the text of a #GtkLabel), then you will have to call gtk_widget_queue_resize() or gtk_widget_queue_draw_area() yourself.
gdk_frame_clock_get_frame_time() should generally be used for timing continuous animations and gdk_frame_timings_get_predicted_presentation_time() if you are trying to display isolated frames at particular times.
This is a more convenient alternative to connecting directly to the #GdkFrameClock::update signal of #GdkFrameClock, since you don't have to worry about when a #GdkFrameClock is assigned to a widget.
function to call for updating animations
Creates a binding between source_property on source and target_property
on target.
Whenever the source_property is changed the target_property is
updated using the same value. For instance:
g_object_bind_property (action, "active", widget, "sensitive", 0);
Will result in the "sensitive" property of the widget #GObject instance to be updated with the same value of the "active" property of the action #GObject instance.
If flags contains %G_BINDING_BIDIRECTIONAL then the binding will be mutual:
if target_property on target changes then the source_property on source
will be updated as well.
The binding will automatically be removed when either the source or the
target instances are finalized. To remove the binding without affecting the
source and the target you can just call g_object_unref() on the returned
#GBinding instance.
Removing the binding by calling g_object_unref() on it must only be done if
the binding, source and target are only used from a single thread and it
is clear that both source and target outlive the binding. Especially it
is not safe to rely on this if the binding, source or target can be
finalized from different threads. Keep another reference to the binding and
use g_binding_unbind() instead to be on the safe side.
A #GObject can have multiple bindings.
the property on source to bind
the target #GObject
the property on target to bind
flags to pass to #GBinding
Creates a binding between source_property on source and target_property
on target, allowing you to set the transformation functions to be used by
the binding.
This function is the language bindings friendly version of g_object_bind_property_full(), using #GClosures instead of function pointers.
the property on source to bind
the target #GObject
the property on target to bind
flags to pass to #GBinding
a #GClosure wrapping the transformation function from the source to the target, or %NULL to use the default
a #GClosure wrapping the transformation function from the target to the source, or %NULL to use the default
Determines whether an accelerator that activates the signal
identified by signal_id can currently be activated.
This is done by emitting the #GtkWidget::can-activate-accel
signal on widget; if the signal isn’t overridden by a
handler or in a derived widget, then the default check is
that the widget must be sensitive, and the widget and all
its ancestors mapped.
the ID of a signal installed on widget
This function is used by custom widget implementations; if you're writing an app, you’d use gtk_widget_grab_focus() to move the focus to a particular widget, and gtk_container_set_focus_chain() to change the focus tab order. So you may want to investigate those functions instead.
gtk_widget_child_focus() is called by containers as the user moves
around the window using keyboard shortcuts. direction indicates
what kind of motion is taking place (up, down, left, right, tab
forward, tab backward). gtk_widget_child_focus() emits the
#GtkWidget::focus signal; widgets override the default handler
for this signal in order to implement appropriate focus behavior.
The default ::focus handler for a widget should return %TRUE if
moving in direction left the focus on a focusable location inside
that widget, and %FALSE if moving in direction moved the focus
outside the widget. If returning %TRUE, widgets normally
call gtk_widget_grab_focus() to place the focus accordingly;
if returning %FALSE, they don’t modify the current focus location.
direction of focus movement
Emits a #GtkWidget::child-notify signal for the
[child property][child-properties]
child_property on the child.
This is an analogue of g_object_notify() for child properties.
Also see gtk_widget_child_notify().
Emits a #GtkWidget::child-notify signal for the
[child property][child-properties] specified by
pspec on the child.
This is an analogue of g_object_notify_by_pspec() for child properties.
the child widget
the #GParamSpec of a child property instealled on the class of container
Returns the type of the children supported by the container.
Note that this may return %G_TYPE_NONE to indicate that no more children can be added, e.g. for a #GtkPaned which already has two children.
Same as gtk_widget_path(), but always uses the name of a widget’s type, never uses a custom name set with gtk_widget_set_name().
Computes whether a container should give this widget extra space when possible. Containers should check this, rather than looking at gtk_widget_get_hexpand() or gtk_widget_get_vexpand().
This function already checks whether the widget is visible, so visibility does not need to be checked separately. Non-visible widgets are not expanded.
The computed expand value uses either the expand setting explicitly set on the widget itself, or, if none has been explicitly set, the widget may expand if some of its children do.
expand direction
Creates a new #PangoLayout with the appropriate font map, font description, and base direction for drawing text for this widget.
If you keep a #PangoLayout created in this way around, you need to re-create it when the widget #PangoContext is replaced. This can be tracked by using the #GtkWidget::screen-changed signal on the widget.
text to set on the layout (can be %NULL)
This is similar to gtk_buildable_parser_finished() but is
called once for each custom tag handled by the buildable.
a #GtkBuilder
child object or %NULL for non-child tags
the name of the tag
user data created in custom_tag_start
This is called at the end of each custom element handled by the buildable.
#GtkBuilder used to construct this object
child object or %NULL for non-child tags
name of tag
user data that will be passed in to parser functions
This is called for each unknown element under <child>.
a #GtkBuilder used to construct this object
child object or %NULL for non-child tags
name of tag
Destroys a widget.
When a widget is destroyed all references it holds on other objects will be released:
It's expected that all references held on the widget will also
be released; you should connect to the #GtkWidget::destroy signal
if you hold a reference to widget and you wish to remove it when
this function is called. It is not necessary to do so if you are
implementing a #GtkContainer, as you'll be able to use the
#GtkContainerClass.remove() virtual function for that.
It's important to notice that gtk_widget_destroy() will only cause
the widget to be finalized if no additional references, acquired
using g_object_ref(), are held on it. In case additional references
are in place, the widget will be in an "inert" state after calling
this function; widget will still point to valid memory, allowing you
to release the references you hold, but you may not query the widget's
own state.
You should typically call this function on top level widgets, and rarely on child widgets.
See also: gtk_container_remove()
This function sets *widget_pointer to %NULL if widget_pointer !=
%NULL. It’s intended to be used as a callback connected to the
“destroy” signal of a widget. You connect gtk_widget_destroyed()
as a signal handler, and pass the address of your widget variable
as user data. Then when the widget is destroyed, the variable will
be set to %NULL. Useful for example to avoid multiple copies
of the same dialog.
This function is equivalent to gtk_drag_begin_with_coordinates(), passing -1, -1 as coordinates.
The targets (data formats) in which the source can provide the data
A bitmask of the allowed drag actions for this drag
The button the user clicked to start the drag
The event that triggered the start of the drag, or %NULL if none can be obtained.
Initiates a drag on the source side. The function only needs to be used when the application is starting drags itself, and is not needed when gtk_drag_source_set() is used.
The event is used to retrieve the timestamp that will be used internally to
grab the pointer. If event is %NULL, then %GDK_CURRENT_TIME will be used.
However, you should try to pass a real event in all cases, since that can be
used to get information about the drag.
Generally there are three cases when you want to start a drag by hand by calling this function:
During a #GtkWidget::button-press-event handler, if you want to start a drag
immediately when the user presses the mouse button. Pass the event
that you have in your #GtkWidget::button-press-event handler.
During a #GtkWidget::motion-notify-event handler, if you want to start a drag
when the mouse moves past a certain threshold distance after a button-press.
Pass the event that you have in your #GtkWidget::motion-notify-event handler.
During a timeout handler, if you want to start a drag after the mouse button is held down for some time. Try to save the last event that you got from the mouse, using gdk_event_copy(), and pass it to this function (remember to free the event with gdk_event_free() when you are done). If you really cannot pass a real event, pass %NULL instead.
The targets (data formats) in which the source can provide the data
A bitmask of the allowed drag actions for this drag
The button the user clicked to start the drag
The event that triggered the start of the drag, or %NULL if none can be obtained.
The initial x coordinate to start dragging from, in the coordinate space of widget. If -1 is passed, the coordinates are retrieved from event or the current pointer position
The initial y coordinate to start dragging from, in the coordinate space of widget. If -1 is passed, the coordinates are retrieved from event or the current pointer position
Checks to see if a mouse drag starting at (start_x, start_y) and ending
at (current_x, current_y) has passed the GTK+ drag threshold, and thus
should trigger the beginning of a drag-and-drop operation.
X coordinate of start of drag
Y coordinate of start of drag
current X coordinate
current Y coordinate
Add the image targets supported by #GtkSelectionData to
the target list of the drag destination. The targets
are added with info = 0. If you need another value,
use gtk_target_list_add_image_targets() and
gtk_drag_dest_set_target_list().
Add the text targets supported by #GtkSelectionData to
the target list of the drag destination. The targets
are added with info = 0. If you need another value,
use gtk_target_list_add_text_targets() and
gtk_drag_dest_set_target_list().
Add the URI targets supported by #GtkSelectionData to
the target list of the drag destination. The targets
are added with info = 0. If you need another value,
use gtk_target_list_add_uri_targets() and
gtk_drag_dest_set_target_list().
Looks for a match between the supported targets of context and the
dest_target_list, returning the first matching target, otherwise
returning %GDK_NONE. dest_target_list should usually be the return
value from gtk_drag_dest_get_target_list(), but some widgets may
have different valid targets for different parts of the widget; in
that case, they will have to implement a drag_motion handler that
passes the correct target list to this function.
drag context
list of droppable targets, or %NULL to use gtk_drag_dest_get_target_list (widget).
Returns the list of targets this widget can accept from drag-and-drop.
Returns whether the widget has been configured to always emit #GtkWidget::drag-motion signals.
Sets a widget as a potential drop destination, and adds default behaviors.
The default behaviors listed in flags have an effect similar
to installing default handlers for the widget’s drag-and-drop signals
(#GtkWidget::drag-motion, #GtkWidget::drag-drop, ...). They all exist
for convenience. When passing #GTK_DEST_DEFAULT_ALL for instance it is
sufficient to connect to the widget’s #GtkWidget::drag-data-received
signal to get primitive, but consistent drag-and-drop support.
Things become more complicated when you try to preview the dragged data,
as described in the documentation for #GtkWidget::drag-motion. The default
behaviors described by flags make some assumptions, that can conflict
with your own signal handlers. For instance #GTK_DEST_DEFAULT_DROP causes
invokations of gdk_drag_status() in the context of #GtkWidget::drag-motion,
and invokations of gtk_drag_finish() in #GtkWidget::drag-data-received.
Especially the later is dramatic, when your own #GtkWidget::drag-motion
handler calls gtk_drag_get_data() to inspect the dragged data.
There’s no way to set a default action here, you can use the #GtkWidget::drag-motion callback for that. Here’s an example which selects the action to use depending on whether the control key is pressed or not:
static void
drag_motion (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
guint time)
{
GdkModifierType mask;
gdk_window_get_pointer (gtk_widget_get_window (widget),
NULL, NULL, &mask);
if (mask & GDK_CONTROL_MASK)
gdk_drag_status (context, GDK_ACTION_COPY, time);
else
gdk_drag_status (context, GDK_ACTION_MOVE, time);
}
which types of default drag behavior to use
a pointer to an array of #GtkTargetEntrys indicating the drop types that this widget will accept, or %NULL. Later you can access the list with gtk_drag_dest_get_target_list() and gtk_drag_dest_find_target().
a bitmask of possible actions for a drop onto this widget.
Sets this widget as a proxy for drops to another window.
the window to which to forward drag events
the drag protocol which the proxy_window accepts (You can use gdk_drag_get_protocol() to determine this)
If %TRUE, send the same coordinates to the destination, because it is an embedded subwindow.
Sets the target types that this widget can accept from drag-and-drop. The widget must first be made into a drag destination with gtk_drag_dest_set().
list of droppable targets, or %NULL for none
Tells the widget to emit #GtkWidget::drag-motion and #GtkWidget::drag-leave events regardless of the targets and the %GTK_DEST_DEFAULT_MOTION flag.
This may be used when a widget wants to do generic actions regardless of the targets that the source offers.
whether to accept all targets
Clears information about a drop destination set with gtk_drag_dest_set(). The widget will no longer receive notification of drags.
Gets the data associated with a drag. When the data
is received or the retrieval fails, GTK+ will emit a
#GtkWidget::drag-data-received signal. Failure of the retrieval
is indicated by the length field of the selection_data
signal parameter being negative. However, when gtk_drag_get_data()
is called implicitely because the %GTK_DEST_DEFAULT_DROP was set,
then the widget will not receive notification of failed
drops.
the drag context
the target (form of the data) to retrieve
a timestamp for retrieving the data. This will generally be the time received in a #GtkWidget::drag-motion or #GtkWidget::drag-drop signal
Highlights a widget as a currently hovered drop target. To end the highlight, call gtk_drag_unhighlight(). GTK+ calls this automatically if %GTK_DEST_DEFAULT_HIGHLIGHT is set.
Add the writable image targets supported by #GtkSelectionData to
the target list of the drag source. The targets
are added with info = 0. If you need another value,
use gtk_target_list_add_image_targets() and
gtk_drag_source_set_target_list().
Add the text targets supported by #GtkSelectionData to
the target list of the drag source. The targets
are added with info = 0. If you need another value,
use gtk_target_list_add_text_targets() and
gtk_drag_source_set_target_list().
Add the URI targets supported by #GtkSelectionData to
the target list of the drag source. The targets
are added with info = 0. If you need another value,
use gtk_target_list_add_uri_targets() and
gtk_drag_source_set_target_list().
Gets the list of targets this widget can provide for drag-and-drop.
Sets up a widget so that GTK+ will start a drag operation when the user clicks and drags on the widget. The widget must have a window.
the bitmask of buttons that can start the drag
the table of targets that the drag will support, may be %NULL
the bitmask of possible actions for a drag from this widget
Sets the icon that will be used for drags from a particular source to a themed icon. See the docs for #GtkIconTheme for more details.
name of icon to use
Sets the icon that will be used for drags from a particular widget
from a #GdkPixbuf. GTK+ retains a reference for pixbuf and will
release it when it is no longer needed.
the #GdkPixbuf for the drag icon
Sets the icon that will be used for drags from a particular source to a stock icon.
the ID of the stock icon to use
Changes the target types that this widget offers for drag-and-drop. The widget must first be made into a drag source with gtk_drag_source_set().
list of draggable targets, or %NULL for none
Undoes the effects of gtk_drag_source_set().
Removes a highlight set by gtk_drag_highlight() from a widget.
Draws widget to cr. The top left corner of the widget will be
drawn to the currently set origin point of cr.
You should pass a cairo context as cr argument that is in an
original state. Otherwise the resulting drawing is undefined. For
example changing the operator using cairo_set_operator() or the
line width using cairo_set_line_width() might have unwanted side
effects.
You may however change the context’s transform matrix - like with
cairo_scale(), cairo_translate() or cairo_set_matrix() and clip
region with cairo_clip() prior to calling this function. Also, it
is fine to modify the context with cairo_save() and
cairo_push_group() prior to calling this function.
Note that special-purpose widgets may contain special code for rendering to the screen and might appear differently on screen and when rendered using gtk_widget_draw().
Ensures that widget has a style (widget->style).
Not a very useful function; most of the time, if you want the style, the widget is realized, and realized widgets are guaranteed to have a style already.
Notifies the user about an input-related error on this widget. If the #GtkSettings:gtk-error-bell setting is %TRUE, it calls gdk_window_beep(), otherwise it does nothing.
Note that the effect of gdk_window_beep() can be configured in many ways, depending on the windowing backend and the desktop environment or window manager that is used.
Rarely-used function. This function is used to emit the event signals on a widget (those signals should never be emitted without using this function to do so). If you want to synthesize an event though, don’t use this function; instead, use gtk_main_do_event() so the event will behave as if it were in the event queue. Don’t synthesize expose events; instead, use gdk_window_invalidate_rect() to invalidate a region of the window.
Invokes callback on each direct child of container, including
children that are considered “internal” (implementation details
of the container). “Internal” children generally weren’t added
by the user of the container, but were added by the container
implementation itself.
Most applications should use gtk_container_foreach(), rather than gtk_container_forall().
This function is intended for #GObject implementations to re-enforce a [floating][floating-ref] object reference. Doing this is seldom required: all #GInitiallyUnowneds are created with a floating reference which usually just needs to be sunken by calling g_object_ref_sink().
Invokes callback on each non-internal child of container.
See gtk_container_forall() for details on what constitutes
an “internal” child. For all practical purposes, this function
should iterate over precisely those child widgets that were
added to the container by the application with explicit add()
calls.
It is permissible to remove the child from the callback handler.
Most applications should use gtk_container_foreach(), rather than gtk_container_forall().
Stops emission of #GtkWidget::child-notify signals on widget. The
signals are queued until gtk_widget_thaw_child_notify() is called
on widget.
This is the analogue of g_object_freeze_notify() for child properties.
Increases the freeze count on object. If the freeze count is
non-zero, the emission of "notify" signals on object is
stopped. The signals are queued until the freeze count is decreased
to zero. Duplicate notifications are squashed so that at most one
#GObject::notify signal is emitted for each property modified while the
object is frozen.
This is necessary for accessors that modify multiple properties to prevent premature notification while the object is still being modified.
Returns the accessible object that describes the widget to an assistive technology.
If accessibility support is not available, this #AtkObject instance may be a no-op. Likewise, if no class-specific #AtkObject implementation is available for the widget instance in question, it will inherit an #AtkObject implementation from the first ancestor class for which such an implementation is defined.
The documentation of the ATK library contains more information about accessible objects and their uses.
Retrieves the #GActionGroup that was registered using prefix. The resulting
#GActionGroup may have been registered to widget or any #GtkWidget in its
ancestry.
If no action group was found matching prefix, then %NULL is returned.
The “prefix” of the action group.
Returns the baseline that has currently been allocated to widget.
This function is intended to be used when implementing handlers
for the #GtkWidget::draw function, and when allocating child
widgets in #GtkWidget::size_allocate.
Returns the height that has currently been allocated to widget.
This function is intended to be used when implementing handlers
for the #GtkWidget::draw function.
Retrieves the widget’s allocated size.
This function returns the last values passed to gtk_widget_size_allocate_with_baseline(). The value differs from the size returned in gtk_widget_get_allocation() in that functions like gtk_widget_set_halign() can adjust the allocation, but not the value returned by this function.
If a widget is not visible, its allocated size is 0.
Returns the width that has currently been allocated to widget.
This function is intended to be used when implementing handlers
for the #GtkWidget::draw function.
Retrieves the widget’s allocation.
Note, when implementing a #GtkContainer: a widget’s allocation will be its “adjusted” allocation, that is, the widget’s parent container typically calls gtk_widget_size_allocate() with an allocation, and that allocation is then adjusted (to handle margin and alignment for example) before assignment to the widget. gtk_widget_get_allocation() returns the adjusted allocation that was actually assigned to the widget. The adjusted allocation is guaranteed to be completely contained within the gtk_widget_size_allocate() allocation, however. So a #GtkContainer is guaranteed that its children stay inside the assigned bounds, but not that they have exactly the bounds the container assigned. There is no way to get the original allocation assigned by gtk_widget_size_allocate(), since it isn’t stored; if a container implementation needs that information it will have to track it itself.
Gets the first ancestor of widget with type widget_type. For example,
gtk_widget_get_ancestor (widget, GTK_TYPE_BOX) gets
the first #GtkBox that’s an ancestor of widget. No reference will be
added to the returned widget; it should not be unreferenced. See note
about checking for a toplevel #GtkWindow in the docs for
gtk_widget_get_toplevel().
Note that unlike gtk_widget_is_ancestor(), gtk_widget_get_ancestor()
considers widget to be an ancestor of itself.
ancestor type
Determines whether the application intends to draw on the widget in an #GtkWidget::draw handler.
See gtk_widget_set_app_paintable()
Gets the value set by gtk_box_set_baseline_position().
Retrieves the border width of the container. See gtk_container_set_border_width().
Determines whether widget can be a default widget. See
gtk_widget_set_can_default().
Determines whether widget can own the input focus. See
gtk_widget_set_can_focus().
This function is only for use in widget implementations. Obtains
widget->requisition, unless someone has forced a particular
geometry on the widget (e.g. with gtk_widget_set_size_request()),
in which case it returns that geometry instead of the widget's
requisition.
This function differs from gtk_widget_size_request() in that
it retrieves the last size request value from widget->requisition,
while gtk_widget_size_request() actually calls the "size_request" method
on widget to compute the size request and fill in widget->requisition,
and only then returns widget->requisition.
Because this function does not call the “size_request” method, it
can only be used when you know that widget->requisition is
up-to-date, that is, gtk_widget_size_request() has been called
since the last time a resize was queued. In general, only container
implementations have this information; applications should use
gtk_widget_size_request().
Gets the value set with gtk_widget_set_child_visible(). If you feel a need to use this function, your code probably needs reorganization.
This function is only useful for container implementations and never should be called by an application.
Returns the clipboard object for the given selection to
be used with widget. widget must have a #GdkDisplay
associated with it, so must be attached to a toplevel
window.
a #GdkAtom which identifies the clipboard to use. %GDK_SELECTION_CLIPBOARD gives the default clipboard. Another common value is %GDK_SELECTION_PRIMARY, which gives the primary X selection.
Obtains the composite name of a widget.
Gets a named field from the objects table of associations (see g_object_set_data()).
name of the key for that association
Gets the reading direction for a particular widget. See gtk_widget_set_direction().
Get the #GdkDisplay for the toplevel window associated with this widget. This function can only be called after the widget has been added to a widget hierarchy with a #GtkWindow at the top.
In general, you should only create display specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.
Determines whether the widget is double buffered.
See gtk_widget_set_double_buffered()
Returns the event mask (see #GdkEventMask) for the widget. These are the events that the widget will receive.
Note: Internally, the widget event mask will be the logical OR of the event mask set through gtk_widget_set_events() or gtk_widget_add_events(), and the event mask necessary to cater for every #GtkEventController created for the widget.
Retrieves the horizontal focus adjustment for the container. See gtk_container_set_focus_hadjustment ().
Returns whether the widget should grab focus when it is clicked with the mouse. See gtk_widget_set_focus_on_click().
Retrieves the vertical focus adjustment for the container. See gtk_container_set_focus_vadjustment().
Returns the #cairo_font_options_t used for Pango rendering. When not set, the defaults font options for the #GdkScreen will be used.
Obtains the frame clock for a widget. The frame clock is a global “ticker” that can be used to drive animations and repaints. The most common reason to get the frame clock is to call gdk_frame_clock_get_frame_time(), in order to get a time to use for animating. For example you might record the start of the animation with an initial value from gdk_frame_clock_get_frame_time(), and then update the animation by calling gdk_frame_clock_get_frame_time() again during each repaint.
gdk_frame_clock_request_phase() will result in a new frame on the clock, but won’t necessarily repaint any widgets. To repaint a widget, you have to use gtk_widget_queue_draw() which invalidates the widget (thus scheduling it to receive a draw on the next frame). gtk_widget_queue_draw() will also end up requesting a frame on the appropriate frame clock.
A widget’s frame clock will not change while the widget is mapped. Reparenting a widget (which implies a temporary unmap) can change the widget’s frame clock.
Unrealized widgets do not have a frame clock.
Returns the current value of the has-tooltip property. See #GtkWidget:has-tooltip for more information.
Determines whether widget has a #GdkWindow of its own. See
gtk_widget_set_has_window().
Gets whether the widget would like any available extra horizontal space. When a user resizes a #GtkWindow, widgets with expand=TRUE generally receive the extra space. For example, a list or scrollable area or document in your window would often be set to expand.
Containers should use gtk_widget_compute_expand() rather than this function, to see whether a widget, or any of its children, has the expand flag set. If any child of a widget wants to expand, the parent may ask to expand also.
This function only looks at the widget’s own hexpand flag, rather than computing whether the entire widget tree rooted at this widget wants to expand.
Gets whether gtk_widget_set_hexpand() has been used to explicitly set the expand flag on this widget.
If hexpand is set, then it overrides any computed expand value based on child widgets. If hexpand is not set, then the expand value depends on whether any children of the widget would like to expand.
There are few reasons to use this function, but it’s here for completeness and consistency.
Returns whether the box is homogeneous (all children are the same size). See gtk_box_set_homogeneous().
Whether the widget is mapped.
Gets the value of the #GtkWidget:margin-bottom property.
Gets the value of the #GtkWidget:margin-end property.
Gets the value of the #GtkWidget:margin-left property.
Gets the value of the #GtkWidget:margin-right property.
Gets the value of the #GtkWidget:margin-start property.
Gets the value of the #GtkWidget:margin-top property.
Returns the modifier mask the widget’s windowing system backend
uses for a particular purpose.
See gdk_keymap_get_modifier_mask().
the use case for the modifier mask
Returns the current modifier style for the widget. (As set by gtk_widget_modify_style().) If no style has previously set, a new #GtkRcStyle will be created with all values unset, and set as the modifier style for the widget. If you make changes to this rc style, you must call gtk_widget_modify_style(), passing in the returned rc style, to make sure that your changes take effect.
Caution: passing the style back to gtk_widget_modify_style() will normally end up destroying it, because gtk_widget_modify_style() copies the passed-in style and sets the copy as the new modifier style, thus dropping any reference to the old modifier style. Add a reference to the modifier style if you want to keep it alive.
Retrieves the name of a widget. See gtk_widget_set_name() for the significance of widget names.
Returns the current value of the #GtkWidget:no-show-all property, which determines whether calls to gtk_widget_show_all() will affect this widget.
Fetches the requested opacity for this widget. See gtk_widget_set_opacity().
Retrieves the orientation of the orientable.
Gets a #PangoContext with the appropriate font map, font description, and base direction for this widget. Unlike the context returned by gtk_widget_create_pango_context(), this context is owned by the widget (it can be used until the screen for the widget changes or the widget is removed from its toplevel), and will be updated to match any changes to the widget’s attributes. This can be tracked by using the #GtkWidget::screen-changed signal on the widget.
Returns the #GtkWidgetPath representing widget, if the widget
is not connected to a toplevel widget, a partial path will be
created.
Returns a newly created widget path representing all the widget hierarchy
from the toplevel down to and including child.
Obtains the location of the mouse pointer in widget coordinates.
Widget coordinates are a bit odd; for historical reasons, they are
defined as widget->window coordinates for widgets that return %TRUE for
gtk_widget_get_has_window(); and are relative to widget->allocation.x,
widget->allocation.y otherwise.
Retrieves a widget’s initial minimum and natural height.
This call is specific to width-for-height requests.
The returned request will be modified by the GtkWidgetClass::adjust_size_request virtual method and by any #GtkSizeGroups that have been applied. That is, the returned request is the one that should be used for layout, not necessarily the one returned by the widget itself.
Retrieves a widget’s minimum and natural height and the corresponding baselines if it would be given
the specified width, or the default height if width is -1. The baselines may be -1 which means
that no baseline is requested for this widget.
The returned request will be modified by the GtkWidgetClass::adjust_size_request and GtkWidgetClass::adjust_baseline_request virtual methods and by any #GtkSizeGroups that have been applied. That is, the returned request is the one that should be used for layout, not necessarily the one returned by the widget itself.
the width which is available for allocation, or -1 if none
Retrieves a widget’s minimum and natural height if it would be given
the specified width.
The returned request will be modified by the GtkWidgetClass::adjust_size_request virtual method and by any #GtkSizeGroups that have been applied. That is, the returned request is the one that should be used for layout, not necessarily the one returned by the widget itself.
the width which is available for allocation
Retrieves the minimum and natural size of a widget, taking into account the widget’s preference for height-for-width management.
This is used to retrieve a suitable size by container widgets which do not impose any restrictions on the child placement. It can be used to deduce toplevel window and menu sizes as well as child widgets in free-form containers such as GtkLayout.
Handle with care. Note that the natural height of a height-for-width widget will generally be a smaller size than the minimum height, since the required height for the natural width is generally smaller than the required height for the minimum width.
Use gtk_widget_get_preferred_height_and_baseline_for_width() if you want to support baseline alignment.
Retrieves a widget’s initial minimum and natural width.
This call is specific to height-for-width requests.
The returned request will be modified by the GtkWidgetClass::adjust_size_request virtual method and by any #GtkSizeGroups that have been applied. That is, the returned request is the one that should be used for layout, not necessarily the one returned by the widget itself.
Retrieves a widget’s minimum and natural width if it would be given
the specified height.
The returned request will be modified by the GtkWidgetClass::adjust_size_request virtual method and by any #GtkSizeGroups that have been applied. That is, the returned request is the one that should be used for layout, not necessarily the one returned by the widget itself.
the height which is available for allocation
Gets a property of an object.
The value can be:
In general, a copy is made of the property contents and the caller is responsible for freeing the memory by calling g_value_unset().
Note that g_object_get_property() is really intended for language bindings, g_object_get() is much more convenient for C programming.
the name of the property to get
return location for the property value
This function gets back user data pointers stored via g_object_set_qdata().
A #GQuark, naming the user data pointer
Determines whether widget is realized.
Determines whether widget is always treated as the default widget
within its toplevel when it has the focus, even if another widget
is the default.
See gtk_widget_set_receives_default().
Gets whether the widget prefers a height-for-width layout or a width-for-height layout.
#GtkBin widgets generally propagate the preference of their child, container widgets need to request something either in context of their children or in context of their allocation capabilities.
Retrieves the widget’s requisition.
This function should only be used by widget implementations in order to figure whether the widget’s requisition has actually changed after some internal state change (so that they can call gtk_widget_queue_resize() instead of gtk_widget_queue_draw()).
Normally, gtk_widget_size_request() should be used.
Returns the resize mode for the container. See gtk_container_set_resize_mode ().
Get the root window where this widget is located. This function can only be called after the widget has been added to a widget hierarchy with #GtkWindow at the top.
The root window is useful for such purposes as creating a popup #GdkWindow associated with the window. In general, you should only create display specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.
Retrieves the internal scale factor that maps from window coordinates to the actual device pixels. On traditional systems this is 1, on high density outputs, it can be a higher value (typically 2).
See gdk_window_get_scale_factor().
Get the #GdkScreen from the toplevel window associated with this widget. This function can only be called after the widget has been added to a widget hierarchy with a #GtkWindow at the top.
In general, you should only create screen specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.
Returns the widget’s sensitivity (in the sense of returning the value that has been set using gtk_widget_set_sensitive()).
The effective sensitivity of a widget is however determined by both its own and its parent widget’s sensitivity. See gtk_widget_is_sensitive().
Gets the size request that was explicitly set for the widget using
gtk_widget_set_size_request(). A value of -1 stored in width or
height indicates that that dimension has not been set explicitly
and the natural requisition of the widget will be used instead. See
gtk_widget_set_size_request(). To get the size a widget will
actually request, call gtk_widget_get_preferred_size() instead of
this function.
Gets the value set by gtk_box_set_spacing().
Returns the widget state as a flag set. It is worth mentioning
that the effective %GTK_STATE_FLAG_INSENSITIVE state will be
returned, that is, also based on parent insensitivity, even if
widget itself is sensitive.
Also note that if you are looking for a way to obtain the #GtkStateFlags to pass to a #GtkStyleContext method, you should look at gtk_style_context_get_state().
Returns the style context associated to widget. The returned object is
guaranteed to be the same for the lifetime of widget.
Returns %TRUE if widget is multiple pointer aware. See
gtk_widget_set_support_multidevice() for more information.
Fetch an object build from the template XML for widget_type in this widget instance.
This will only report children which were previously declared with gtk_widget_class_bind_template_child_full() or one of its variants.
This function is only meant to be called for code which is private to the widget_type which
declared the child and is meant for language bindings which cannot easily make use
of the GObject structure offsets.
The #GType to get a template child for
The “id” of the child defined in the template XML
Gets the contents of the tooltip for widget.
Gets the contents of the tooltip for widget.
This function returns the topmost widget in the container hierarchy
widget is a part of. If widget has no parent widgets, it will be
returned as the topmost widget. No reference will be added to the
returned widget; it should not be unreferenced.
Note the difference in behavior vs. gtk_widget_get_ancestor();
gtk_widget_get_ancestor (widget, GTK_TYPE_WINDOW)
would return
%NULL if widget wasn’t inside a toplevel window, and if the
window was inside a #GtkWindow-derived widget which was in turn
inside the toplevel #GtkWindow. While the second case may
seem unlikely, it actually happens when a #GtkPlug is embedded
inside a #GtkSocket within the same application.
To reliably find the toplevel #GtkWindow, use gtk_widget_get_toplevel() and call GTK_IS_WINDOW() on the result. For instance, to get the title of a widget's toplevel window, one might use:
static const char *
get_widget_toplevel_title (GtkWidget *widget)
{
GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
if (GTK_IS_WINDOW (toplevel))
{
return gtk_window_get_title (GTK_WINDOW (toplevel));
}
return NULL;
}
Gets the value of the #GtkWidget:valign property.
For backwards compatibility reasons this method will never return
%GTK_ALIGN_BASELINE, but instead it will convert it to
%GTK_ALIGN_FILL. If your widget want to support baseline aligned
children it must use gtk_widget_get_valign_with_baseline(), or
g_object_get (widget, "valign", &value, NULL), which will
also report the true value.
Gets whether the widget would like any available extra vertical space.
See gtk_widget_get_hexpand() for more detail.
Gets whether gtk_widget_set_vexpand() has been used to explicitly set the expand flag on this widget.
See gtk_widget_get_hexpand_set() for more detail.
Determines whether the widget is visible. If you want to take into account whether the widget’s parent is also marked as visible, use gtk_widget_is_visible() instead.
This function does not check if the widget is obscured in any way.
See gtk_widget_set_visible().
Gets n_properties properties for an object.
Obtained properties will be set to values. All properties must be valid.
Warnings will be emitted and undefined behaviour may result if invalid
properties are passed in.
the names of each property to get
the values of each property to get
Makes widget the current grabbed widget.
This means that interaction with other widgets in the same application is blocked and mouse as well as keyboard events are delivered to this widget.
If widget is not sensitive, it is not set as the current
grabbed widget and this function does nothing.
Causes widget to become the default widget. widget must be able to be
a default widget; typically you would ensure this yourself
by calling gtk_widget_set_can_default() with a %TRUE value.
The default widget is activated when
the user presses Enter in a window. Default widgets must be
activatable, that is, gtk_widget_activate() should affect them. Note
that #GtkEntry widgets require the “activates-default” property
set to %TRUE before they activate the default widget when Enter
is pressed and the #GtkEntry is focused.
Causes widget to have the keyboard focus for the #GtkWindow it's
inside. widget must be a focusable widget, such as a #GtkEntry;
something like #GtkFrame won’t work.
More precisely, it must have the %GTK_CAN_FOCUS flag set. Use gtk_widget_set_can_focus() to modify that flag.
The widget also needs to be realized and mapped. This is indicated by the related signals. Grabbing the focus immediately after creating the widget will likely fail and cause critical warnings.
Removes the grab from the given widget.
You have to pair calls to gtk_grab_add() and gtk_grab_remove().
If widget does not have the grab, this function does nothing.
Determines whether the widget is currently grabbing events, so it is the only widget receiving input events (keyboard and mouse).
See also gtk_grab_add().
Determines if the widget style has been looked up through the rc mechanism.
Checks whether there is a #GdkScreen is associated with this widget. All toplevel widgets have an associated screen, and all widgets added into a hierarchy with a toplevel window at the top.
Determines if the widget should show a visible indication that
it has the global input focus. This is a convenience function for
use in ::draw handlers that takes into account whether focus
indication should currently be shown in the toplevel window of
widget. See gtk_window_get_focus_visible() for more information
about focus indication.
To find out if the widget has the global input focus, use gtk_widget_has_focus().
Reverses the effects of gtk_widget_show(), causing the widget to be hidden (invisible to the user).
Utility function; intended to be connected to the #GtkWidget::delete-event signal on a #GtkWindow. The function calls gtk_widget_hide() on its argument, then returns %TRUE. If connected to ::delete-event, the result is that clicking the close button for a window (on the window frame, top right corner usually) will hide but not destroy the window. By default, GTK+ destroys windows when ::delete-event is received.
Returns whether the widget is currently being destroyed. This information can sometimes be used to avoid doing unnecessary work.
Creates and initializes child widgets defined in templates. This function must be called in the instance initializer for any class which assigned itself a template using gtk_widget_class_set_template()
It is important to call this function in the instance initializer of a #GtkWidget subclass and not in #GObject.constructed() or #GObject.constructor() for two reasons.
One reason is that generally derived widgets will assume that parent class composite widgets have been created in their instance initializers.
Another reason is that when calling g_object_new() on a widget with composite templates, it’s important to build the composite widgets before the construct properties are set. Properties passed to g_object_new() should take precedence over properties set in the private template XML.
Inserts group into widget. Children of widget that implement
#GtkActionable can then be associated with actions in group by
setting their “action-name” to
prefix.action-name.
If group is %NULL, a previously inserted group for name is removed
from widget.
the prefix for actions in group
a #GActionGroup, or %NULL
Whether widget can rely on having its alpha channel
drawn correctly. On X11 this function returns whether a
compositing manager is running for widget’s screen.
Please note that the semantics of this call will change in the future if used on a widget that has a composited window in its hierarchy (as set by gdk_window_set_composited()).
Determines whether widget can be drawn to. A widget can be drawn
to if it is mapped and visible.
Checks whether object has a [floating][floating-ref] reference.
Returns the widget’s effective sensitivity, which means it is sensitive itself and also its parent widget is sensitive
Determines whether widget is a toplevel widget.
Currently only #GtkWindow and #GtkInvisible (and out-of-process #GtkPlugs) are toplevel widgets. Toplevel widgets have no parent widget.
Determines whether the widget and all its parents are marked as visible.
This function does not check if the widget is obscured in any way.
See also gtk_widget_get_visible() and gtk_widget_set_visible()
This function should be called whenever keyboard navigation within a single widget hits a boundary. The function emits the #GtkWidget::keynav-failed signal on the widget and its return value should be interpreted in a way similar to the return value of gtk_widget_child_focus():
When %TRUE is returned, stay in the widget, the failed keyboard navigation is OK and/or there is nowhere we can/should move the focus to.
When %FALSE is returned, the caller should continue with keyboard navigation outside the widget, e.g. by calling gtk_widget_child_focus() on the widget’s toplevel.
The default ::keynav-failed handler returns %FALSE for %GTK_DIR_TAB_FORWARD and %GTK_DIR_TAB_BACKWARD. For the other values of #GtkDirectionType it returns %TRUE.
Whenever the default handler returns %TRUE, it also calls gtk_widget_error_bell() to notify the user of the failed keyboard navigation.
A use case for providing an own implementation of ::keynav-failed (either by connecting to it or by overriding it) would be a row of #GtkEntry widgets where the user should be able to navigate the entire row with the cursor keys, as e.g. known from user interfaces that require entering license keys.
direction of focus movement
Lists the closures used by widget for accelerator group connections
with gtk_accel_group_connect_by_path() or gtk_accel_group_connect().
The closures can be used to monitor accelerator changes on widget,
by connecting to the GtkAccelGroup::accel-changed signal of the
#GtkAccelGroup of a closure which can be found out with
gtk_accel_group_from_accel_closure().
Retrieves a %NULL-terminated array of strings containing the prefixes of
#GActionGroup's available to widget.
Returns a newly allocated list of the widgets, normally labels, for which this widget is the target of a mnemonic (see for example, gtk_label_set_mnemonic_widget()).
The widgets in the list are not individually referenced. If you
want to iterate through the list and perform actions involving
callbacks that might destroy the widgets, you
must call g_list_foreach (result, (GFunc)g_object_ref, NULL) first, and then unref all the
widgets afterwards.
This function is only for use in widget implementations. Causes a widget to be mapped if it isn’t already.
Emits the #GtkWidget::mnemonic-activate signal.
%TRUE if there are other widgets with the same mnemonic
Sets the base color for a widget in a particular state. All other style values are left untouched. The base color is the background color used along with the text color (see gtk_widget_modify_text()) for widgets such as #GtkEntry and #GtkTextView. See also gtk_widget_modify_style().
Note that “no window” widgets (which have the %GTK_NO_WINDOW flag set) draw on their parent container’s window and thus may not draw any background themselves. This is the case for e.g. #GtkLabel.
To modify the background of such widgets, you have to set the base color on their parent; if you want to set the background of a rectangular area around a label, try placing the label in a #GtkEventBox widget and setting the base color on that.
the state for which to set the base color
the color to assign (does not need to be allocated), or %NULL to undo the effect of previous calls to of gtk_widget_modify_base().
Sets the background color for a widget in a particular state.
All other style values are left untouched. See also gtk_widget_modify_style().
Note that “no window” widgets (which have the %GTK_NO_WINDOW flag set) draw on their parent container’s window and thus may not draw any background themselves. This is the case for e.g. #GtkLabel.
To modify the background of such widgets, you have to set the background color on their parent; if you want to set the background of a rectangular area around a label, try placing the label in a #GtkEventBox widget and setting the background color on that.
the state for which to set the background color
the color to assign (does not need to be allocated), or %NULL to undo the effect of previous calls to of gtk_widget_modify_bg().
Sets the cursor color to use in a widget, overriding the #GtkWidget cursor-color and secondary-cursor-color style properties.
All other style values are left untouched. See also gtk_widget_modify_style().
the color to use for primary cursor (does not need to be allocated), or %NULL to undo the effect of previous calls to of gtk_widget_modify_cursor().
the color to use for secondary cursor (does not need to be allocated), or %NULL to undo the effect of previous calls to of gtk_widget_modify_cursor().
Sets the foreground color for a widget in a particular state.
All other style values are left untouched. See also gtk_widget_modify_style().
the state for which to set the foreground color
the color to assign (does not need to be allocated), or %NULL to undo the effect of previous calls to of gtk_widget_modify_fg().
Sets the font to use for a widget.
All other style values are left untouched. See also gtk_widget_modify_style().
the font description to use, or %NULL to undo the effect of previous calls to gtk_widget_modify_font()
Modifies style values on the widget.
Modifications made using this technique take precedence over style values set via an RC file, however, they will be overridden if a style is explicitly set on the widget using gtk_widget_set_style(). The #GtkRcStyle-struct is designed so each field can either be set or unset, so it is possible, using this function, to modify some style values and leave the others unchanged.
Note that modifications made with this function are not cumulative with previous calls to gtk_widget_modify_style() or with such functions as gtk_widget_modify_fg(). If you wish to retain previous values, you must first call gtk_widget_get_modifier_style(), make your modifications to the returned style, then call gtk_widget_modify_style() with that style. On the other hand, if you first call gtk_widget_modify_style(), subsequent calls to such functions gtk_widget_modify_fg() will have a cumulative effect with the initial modifications.
Sets the text color for a widget in a particular state.
All other style values are left untouched. The text color is the foreground color used along with the base color (see gtk_widget_modify_base()) for widgets such as #GtkEntry and #GtkTextView. See also gtk_widget_modify_style().
the state for which to set the text color
the color to assign (does not need to be allocated), or %NULL to undo the effect of previous calls to of gtk_widget_modify_text().
Emits a "notify" signal for the property property_name on object.
When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.
Note that emission of the notify signal may be blocked with g_object_freeze_notify(). In this case, the signal emissions are queued and will be emitted (in reverse order) when g_object_thaw_notify() is called.
the name of a property installed on the class of object.
Emits a "notify" signal for the property specified by pspec on object.
This function omits the property name lookup, hence it is faster than g_object_notify().
One way to avoid using g_object_notify() from within the class that registered the properties, and using g_object_notify_by_pspec() instead, is to store the GParamSpec used with g_object_class_install_property() inside a static array, e.g.:
enum
{
PROP_0,
PROP_FOO,
PROP_LAST
};
static GParamSpec *properties[PROP_LAST];
static void
my_object_class_init (MyObjectClass *klass)
{
properties[PROP_FOO] = g_param_spec_int ("foo", "Foo", "The foo",
0, 100,
50,
G_PARAM_READWRITE);
g_object_class_install_property (gobject_class,
PROP_FOO,
properties[PROP_FOO]);
}
and then notify a change on the "foo" property with:
g_object_notify_by_pspec (self, properties[PROP_FOO]);
the #GParamSpec of a property installed on the class of object.
Sets the background color to use for a widget.
All other style values are left untouched. See gtk_widget_override_color().
the state for which to set the background color
the color to assign, or %NULL to undo the effect of previous calls to gtk_widget_override_background_color()
Sets the color to use for a widget.
All other style values are left untouched.
This function does not act recursively. Setting the color of a container does not affect its children. Note that some widgets that you may not think of as containers, for instance #GtkButtons, are actually containers.
This API is mostly meant as a quick way for applications to change a widget appearance. If you are developing a widgets library and intend this change to be themeable, it is better done by setting meaningful CSS classes in your widget/container implementation through gtk_style_context_add_class().
This way, your widget library can install a #GtkCssProvider with the %GTK_STYLE_PROVIDER_PRIORITY_FALLBACK priority in order to provide a default styling for those widgets that need so, and this theming may fully overridden by the user’s theme.
Note that for complex widgets this may bring in undesired results (such as uniform background color everywhere), in these cases it is better to fully style such widgets through a #GtkCssProvider with the %GTK_STYLE_PROVIDER_PRIORITY_APPLICATION priority.
the state for which to set the color
the color to assign, or %NULL to undo the effect of previous calls to gtk_widget_override_color()
Sets the cursor color to use in a widget, overriding the cursor-color and secondary-cursor-color style properties. All other style values are left untouched. See also gtk_widget_modify_style().
Note that the underlying properties have the #GdkColor type,
so the alpha value in primary and secondary will be ignored.
the color to use for primary cursor (does not need to be allocated), or %NULL to undo the effect of previous calls to of gtk_widget_override_cursor().
the color to use for secondary cursor (does not need to be allocated), or %NULL to undo the effect of previous calls to of gtk_widget_override_cursor().
Sets the font to use for a widget. All other style values are left untouched. See gtk_widget_override_color().
the font description to use, or %NULL to undo the effect of previous calls to gtk_widget_override_font()
Sets a symbolic color for a widget.
All other style values are left untouched. See gtk_widget_override_color() for overriding the foreground or background color.
the name of the symbolic color to modify
the color to assign (does not need to be allocated), or %NULL to undo the effect of previous calls to gtk_widget_override_symbolic_color()
Adds child to box, packed with reference to the end of box.
The child is packed after (away from end of) any other child
packed with reference to the end of box.
the #GtkWidget to be added to box
%TRUE if the new child is to be given extra space allocated to box. The extra space will be divided evenly between all children of box that use this option
%TRUE if space given to child by the expand option is actually allocated to child, rather than just padding it. This parameter has no effect if expand is set to %FALSE. A child is always allocated the full height of a horizontal #GtkBox and the full width of a vertical #GtkBox. This option affects the other dimension
extra space in pixels to put between this child and its neighbors, over and above the global amount specified by #GtkBox:spacing property. If child is a widget at one of the reference ends of box, then padding pixels are also put between child and the reference edge of box
Adds child to box, packed with reference to the start of box.
The child is packed after any other child packed with reference
to the start of box.
the #GtkWidget to be added to box
%TRUE if the new child is to be given extra space allocated to box. The extra space will be divided evenly between all children that use this option
%TRUE if space given to child by the expand option is actually allocated to child, rather than just padding it. This parameter has no effect if expand is set to %FALSE. A child is always allocated the full height of a horizontal #GtkBox and the full width of a vertical #GtkBox. This option affects the other dimension
extra space in pixels to put between this child and its neighbors, over and above the global amount specified by #GtkBox:spacing property. If child is a widget at one of the reference ends of box, then padding pixels are also put between child and the reference edge of box
Obtains the full path to widget. The path is simply the name of a
widget and all its parents in the container hierarchy, separated by
periods. The name of a widget comes from
gtk_widget_get_name(). Paths are used to apply styles to a widget
in gtkrc configuration files. Widget names are the type of the
widget by default (e.g. “GtkButton”) or can be set to an
application-specific value with gtk_widget_set_name(). By setting
the name of a widget, you allow users or theme authors to apply
styles to that specific widget in their gtkrc
file. path_reversed_p fills in the path in reverse order,
i.e. starting with widget’s name instead of starting with the name
of widget’s outermost ancestor.
When a container receives a call to the draw function, it must send
synthetic #GtkWidget::draw calls to all children that don’t have their
own #GdkWindows. This function provides a convenient way of doing this.
A container, when it receives a call to its #GtkWidget::draw function,
calls gtk_container_propagate_draw() once for each child, passing in
the cr the container received.
gtk_container_propagate_draw() takes care of translating the origin of cr,
and deciding whether the draw needs to be sent to the child. It is a
convenient and optimized way of getting the same effect as calling
gtk_widget_draw() on the child directly.
In most cases, a container can simply either inherit the #GtkWidget::draw implementation from #GtkContainer, or do some drawing and then chain to the ::draw implementation from #GtkContainer.
a child of container
Cairo context as passed to the container. If you want to use cr in container’s draw function, consider using cairo_save() and cairo_restore() before calling this function.
This function is only for use in widget implementations.
Flags the widget for a rerun of the GtkWidgetClass::size_allocate
function. Use this function instead of gtk_widget_queue_resize()
when the widget's size request didn't change but it wants to
reposition its contents.
An example user of this function is gtk_widget_set_halign().
Mark widget as needing to recompute its expand flags. Call
this function when setting legacy expand child properties
on the child of a container.
See gtk_widget_compute_expand().
Equivalent to calling gtk_widget_queue_draw_area() for the entire area of a widget.
Convenience function that calls gtk_widget_queue_draw_region() on the region created from the given coordinates.
The region here is specified in widget coordinates.
Widget coordinates are a bit odd; for historical reasons, they are
defined as widget->window coordinates for widgets that return %TRUE for
gtk_widget_get_has_window(), and are relative to widget->allocation.x,
widget->allocation.y otherwise.
width or height may be 0, in this case this function does
nothing. Negative values for width and height are not allowed.
x coordinate of upper-left corner of rectangle to redraw
y coordinate of upper-left corner of rectangle to redraw
width of region to draw
height of region to draw
Invalidates the area of widget defined by region by calling
gdk_window_invalidate_region() on the widget’s window and all its
child windows. Once the main loop becomes idle (after the current
batch of events has been processed, roughly), the window will
receive expose events for the union of all regions that have been
invalidated.
Normally you would only use this function in widget implementations. You might also use it to schedule a redraw of a #GtkDrawingArea or some portion thereof.
This function is only for use in widget implementations. Flags a widget to have its size renegotiated; should be called when a widget for some reason has a new size request. For example, when you change the text in a #GtkLabel, #GtkLabel queues a resize to ensure there’s enough space for the new text.
Note that you cannot call gtk_widget_queue_resize() on a widget from inside its implementation of the GtkWidgetClass::size_allocate virtual method. Calls to gtk_widget_queue_resize() from inside GtkWidgetClass::size_allocate will be silently ignored.
This function works like gtk_widget_queue_resize(), except that the widget is not invalidated.
Creates the GDK (windowing system) resources associated with a
widget. For example, widget->window will be created when a widget
is realized. Normally realization happens implicitly; if you show
a widget and all its parent containers, then the widget will be
realized and mapped automatically.
Realizing a widget requires all
the widget’s parent widgets to be realized; calling
gtk_widget_realize() realizes the widget’s parents in addition to
widget itself. If a widget is not yet inside a toplevel window
when you realize it, bad things will happen.
This function is primarily used in widget implementations, and isn’t very useful otherwise. Many times when you think you might need it, a better approach is to connect to a signal that will be called after the widget is realized automatically, such as #GtkWidget::draw. Or simply g_signal_connect () to the #GtkWidget::realize signal.
Increase the reference count of object, and possibly remove the
[floating][floating-ref] reference, if object has a floating reference.
In other words, if the object is floating, then this call "assumes ownership" of the floating reference, converting it to a normal reference by clearing the floating flag while leaving the reference count unchanged. If the object is not floating, then this call adds a new normal reference increasing the reference count by one.
Since GLib 2.56, the type of object will be propagated to the return type
under the same conditions as for g_object_ref().
Computes the intersection of a widget’s area and region, returning
the intersection. The result may be empty, use cairo_region_is_empty() to
check.
a #cairo_region_t, in the same coordinate system as widget->allocation. That is, relative to widget->window for widgets which return %FALSE from gtk_widget_get_has_window(); relative to the parent window of widget->window otherwise.
Registers a #GdkWindow with the widget and sets it up so that the widget receives events for it. Call gtk_widget_unregister_window() when destroying the window.
Before 3.8 you needed to call gdk_window_set_user_data() directly to set this up. This is now deprecated and you should use gtk_widget_register_window() instead. Old code will keep working as is, although some new features like transparency might not work perfectly.
Removes widget from container. widget must be inside container.
Note that container will own a reference to widget, and that this
may be the last reference held; so removing a widget from its
container can destroy that widget. If you want to use widget
again, you need to add a reference to it before removing it from
a container, using g_object_ref(). If you don’t want to use widget
again it’s usually more efficient to simply destroy it directly
using gtk_widget_destroy() since this will remove it from the
container and help break any circular reference count cycles.
Removes an accelerator from widget, previously installed with
gtk_widget_add_accelerator().
accel group for this widget
GDK keyval of the accelerator
modifier key combination of the accelerator
Removes a widget from the list of mnemonic labels for this widget. (See gtk_widget_list_mnemonic_labels()). The widget must have previously been added to the list with gtk_widget_add_mnemonic_label().
a #GtkWidget that was previously set as a mnemonic label for widget with gtk_widget_add_mnemonic_label().
Removes a tick callback previously registered with gtk_widget_add_tick_callback().
an id returned by gtk_widget_add_tick_callback()
A convenience function that uses the theme settings for widget
to look up stock_id and render it to a pixbuf. stock_id should
be a stock icon ID such as #GTK_STOCK_OPEN or #GTK_STOCK_OK. size
should be a size such as #GTK_ICON_SIZE_MENU. detail should be a
string that identifies the widget or code doing the rendering, so
that theme engines can special-case rendering for that widget or
code.
The pixels in the returned #GdkPixbuf are shared with the rest of the application and should not be modified. The pixbuf should be freed after use with g_object_unref().
a stock ID
a stock size (#GtkIconSize). A size of (GtkIconSize)-1 means render at the size of the source and don’t scale (if there are multiple source sizes, GTK+ picks one of the available sizes).
render detail to pass to theme engine
A convenience function that uses the theme engine and style
settings for widget to look up stock_id and render it to
a pixbuf. stock_id should be a stock icon ID such as
#GTK_STOCK_OPEN or #GTK_STOCK_OK. size should be a size
such as #GTK_ICON_SIZE_MENU.
The pixels in the returned #GdkPixbuf are shared with the rest of the application and should not be modified. The pixbuf should be freed after use with g_object_unref().
a stock ID
a stock size (#GtkIconSize). A size of (GtkIconSize)-1 means render at the size of the source and don’t scale (if there are multiple source sizes, GTK+ picks one of the available sizes).
Moves child to a new position in the list of box children.
The list contains widgets packed #GTK_PACK_START
as well as widgets packed #GTK_PACK_END, in the order that these
widgets were added to box.
A widget’s position in the box children list determines where
the widget is packed into box. A child widget at some position
in the list will be packed just after all other widgets of the
same packing type that appear earlier in the list.
the #GtkWidget to move
the new position for child in the list of children of box, starting from 0. If negative, indicates the end of the list
Reset the styles of widget and all descendents, so when
they are looked up again, they get the correct values
for the currently loaded RC file settings.
This function is not useful for applications.
Updates the style context of widget and all descendants
by updating its widget path. #GtkContainers may want
to use this on a child when reordering it in a way that a different
style might apply to it. See also gtk_container_get_path_for_child().
Releases all references to other objects. This can be used to break reference cycles.
This function should only be called from object system implementations.
Very rarely-used function. This function is used to emit an expose event on a widget. This function is not normally used directly. The only time it is used is when propagating an expose event to a windowless child widget (gtk_widget_get_has_window() is %FALSE), and that is normally done using gtk_container_propagate_draw().
If you want to force an area of a window to be redrawn, use gdk_window_invalidate_rect() or gdk_window_invalidate_region(). To cause the redraw to be done immediately, follow that call with a call to gdk_window_process_updates().
Sends the focus change event to widget
This function is not meant to be used by applications. The only time it should be used is when it is necessary for a #GtkWidget to assign focus to a widget that is semantically owned by the first widget even though it’s not a direct child - for instance, a search entry in a floating window similar to the quick search in #GtkTreeView.
An example of its usage is:
GdkEvent *fevent = gdk_event_new (GDK_FOCUS_CHANGE);
fevent->focus_change.type = GDK_FOCUS_CHANGE;
fevent->focus_change.in = TRUE;
fevent->focus_change.window = _gtk_widget_get_window (widget);
if (fevent->focus_change.window != NULL)
g_object_ref (fevent->focus_change.window);
gtk_widget_send_focus_change (widget, fevent);
gdk_event_free (event);
Given an accelerator group, accel_group, and an accelerator path,
accel_path, sets up an accelerator in accel_group so whenever the
key binding that is defined for accel_path is pressed, widget
will be activated. This removes any accelerators (for any
accelerator group) installed by previous calls to
gtk_widget_set_accel_path(). Associating accelerators with
paths allows them to be modified by the user and the modifications
to be saved for future use. (See gtk_accel_map_save().)
This function is a low level function that would most likely be used by a menu creation system like #GtkUIManager. If you use #GtkUIManager, setting up accelerator paths will be done automatically.
Even when you you aren’t using #GtkUIManager, if you only want to set up accelerators on menu items gtk_menu_item_set_accel_path() provides a somewhat more convenient interface.
Note that accel_path string will be stored in a #GQuark. Therefore, if you
pass a static string, you can save some memory by interning it first with
g_intern_static_string().
path used to look up the accelerator
a #GtkAccelGroup.
Sets the widget’s allocation. This should not be used directly, but from within a widget’s size_allocate method.
The allocation set should be the “adjusted” or actual allocation. If you’re implementing a #GtkContainer, you want to use gtk_widget_size_allocate() instead of gtk_widget_set_allocation(). The GtkWidgetClass::adjust_size_allocation virtual method adjusts the allocation inside gtk_widget_size_allocate() to create an adjusted allocation.
Sets whether the application intends to draw on the widget in an #GtkWidget::draw handler.
This is a hint to the widget and does not affect the behavior of the GTK+ core; many widgets ignore this flag entirely. For widgets that do pay attention to the flag, such as #GtkEventBox and #GtkWindow, the effect is to suppress default themed drawing of the widget's background. (Children of the widget will still be drawn.) The application is then entirely responsible for drawing the widget background.
Note that the background is still drawn when the widget is mapped.
%TRUE if the application will paint on the widget
Sets the baseline position of a box. This affects
only horizontal boxes with at least one baseline aligned
child. If there is more vertical space available than requested,
and the baseline is not allocated by the parent then
position is used to allocate the baseline wrt the
extra space available.
a #GtkBaselinePosition
Sets the border width of the container.
The border width of a container is the amount of space to leave around the outside of the container. The only exception to this is #GtkWindow; because toplevel windows can’t leave space outside, they leave the space inside. The border is added on all sides of the container. To add space to only one side, use a specific #GtkWidget:margin property on the child widget, for example #GtkWidget:margin-top.
amount of blank space to leave outside the container. Valid values are in the range 0-65535 pixels.
Specifies whether widget can be a default widget. See
gtk_widget_grab_default() for details about the meaning of
“default”.
whether or not widget can be a default widget.
Specifies whether widget can own the input focus. See
gtk_widget_grab_focus() for actually setting the input focus on a
widget.
whether or not widget can own the input focus.
Sets the way child is packed into box.
the #GtkWidget of the child to set
the new value of the expand child property
the new value of the fill child property
the new value of the padding child property
the new value of the pack-type child property
Sets whether widget should be mapped along with its when its parent
is mapped and widget has been shown with gtk_widget_show().
The child visibility can be set for widget before it is added to a container with gtk_widget_set_parent(), to avoid mapping children unnecessary before immediately unmapping them. However it will be reset to its default state of %TRUE when the widget is removed from a container.
Note that changing the child visibility of a widget does not queue a resize on the widget. Most of the time, the size of a widget is computed from all visible children, whether or not they are mapped. If this is not the case, the container can queue a resize itself.
This function is only useful for container implementations and never should be called by an application.
if %TRUE, widget should be mapped along with its parent.
Sets the widget’s clip. This must not be used directly, but from within a widget’s size_allocate method. It must be called after gtk_widget_set_allocation() (or after chaining up to the parent class), because that function resets the clip.
The clip set should be the area that widget draws on. If widget is a
#GtkContainer, the area must contain all children's clips.
If this function is not called by widget during a ::size-allocate handler,
the clip will be set to widget's allocation.
Sets a widgets composite name. The widget must be a composite child of its parent; see gtk_widget_push_composite_child().
the name to set
Each object carries around a table of associations from strings to pointers. This function lets you set an association.
If the object already had an association with that name, the old association will be destroyed.
Internally, the key is converted to a #GQuark using g_quark_from_string().
This means a copy of key is kept permanently (even after object has been
finalized) — so it is recommended to only use a small, bounded set of values
for key in your program, to avoid the #GQuark storage growing unbounded.
name of the key
data to associate with that key
Enables or disables a #GdkDevice to interact with widget
and all its children.
It does so by descending through the #GdkWindow hierarchy and enabling the same mask that is has for core events (i.e. the one that gdk_window_get_events() returns).
Sets the device event mask (see #GdkEventMask) for a widget. The event
mask determines which events a widget will receive from device. Keep
in mind that different widgets have different default event masks, and by
changing the event mask you may disrupt a widget’s functionality,
so be careful. This function must be called while a widget is
unrealized. Consider gtk_widget_add_device_events() for widgets that are
already realized, or if you want to preserve the existing event
mask. This function can’t be used with windowless widgets (which return
%FALSE from gtk_widget_get_has_window());
to get events on those widgets, place them inside a #GtkEventBox
and receive events on the event box.
Sets the reading direction on a particular widget. This direction controls the primary direction for widgets containing text, and also the direction in which the children of a container are packed. The ability to set the direction is present in order so that correct localization into languages with right-to-left reading directions can be done. Generally, applications will let the default reading direction present, except for containers where the containers are arranged in an order that is explicitly visual rather than logical (such as buttons for text justification).
If the direction is set to %GTK_TEXT_DIR_NONE, then the value set by gtk_widget_set_default_direction() will be used.
the new direction
Widgets are double buffered by default; you can use this function to turn off the buffering. “Double buffered” simply means that gdk_window_begin_draw_frame() and gdk_window_end_draw_frame() are called automatically around expose events sent to the widget. gdk_window_begin_draw_frame() diverts all drawing to a widget's window to an offscreen buffer, and gdk_window_end_draw_frame() draws the buffer to the screen. The result is that users see the window update in one smooth step, and don’t see individual graphics primitives being rendered.
In very simple terms, double buffered widgets don’t flicker, so you would only use this function to turn off double buffering if you had special needs and really knew what you were doing.
Note: if you turn off double-buffering, you have to handle expose events, since even the clearing to the background color or pixmap will not happen automatically (as it is done in gdk_window_begin_draw_frame()).
In 3.10 GTK and GDK have been restructured for translucent drawing. Since then expose events for double-buffered widgets are culled into a single event to the toplevel GDK window. If you now unset double buffering, you will cause a separate rendering pass for every widget. This will likely cause rendering problems - in particular related to stacking - and usually increases rendering times significantly.
%TRUE to double-buffer a widget
Sets the event mask (see #GdkEventMask) for a widget. The event mask determines which events a widget will receive. Keep in mind that different widgets have different default event masks, and by changing the event mask you may disrupt a widget’s functionality, so be careful. This function must be called while a widget is unrealized. Consider gtk_widget_add_events() for widgets that are already realized, or if you want to preserve the existing event mask. This function can’t be used with widgets that have no window. (See gtk_widget_get_has_window()). To get events on those widgets, place them inside a #GtkEventBox and receive events on the event box.
event mask
Sets a focus chain, overriding the one computed automatically by GTK+.
In principle each widget in the chain should be a descendant of the container, but this is not enforced by this method, since it’s allowed to set the focus chain before you pack the widgets, or have a widget in the chain that isn’t always packed. The necessary checks are done when the focus chain is actually traversed.
Sets, or unsets if child is %NULL, the focused child of container.
This function emits the GtkContainer::set_focus_child signal of
container. Implementations of #GtkContainer can override the
default behaviour by overriding the class closure of this signal.
This is function is mostly meant to be used by widgets. Applications can use gtk_widget_grab_focus() to manually set the focus to a specific widget.
Hooks up an adjustment to focus handling in a container, so when a child of the container is focused, the adjustment is scrolled to show that widget. This function sets the horizontal alignment. See gtk_scrolled_window_get_hadjustment() for a typical way of obtaining the adjustment and gtk_container_set_focus_vadjustment() for setting the vertical adjustment.
The adjustments have to be in pixel units and in the same coordinate system as the allocation for immediate children of the container.
an adjustment which should be adjusted when the focus is moved among the descendents of container
Sets whether the widget should grab focus when it is clicked with the mouse. Making mouse clicks not grab focus is useful in places like toolbars where you don’t want the keyboard focus removed from the main area of the application.
whether the widget should grab focus when clicked with the mouse
Hooks up an adjustment to focus handling in a container, so when a child of the container is focused, the adjustment is scrolled to show that widget. This function sets the vertical alignment. See gtk_scrolled_window_get_vadjustment() for a typical way of obtaining the adjustment and gtk_container_set_focus_hadjustment() for setting the horizontal adjustment.
The adjustments have to be in pixel units and in the same coordinate system as the allocation for immediate children of the container.
an adjustment which should be adjusted when the focus is moved among the descendents of container
Sets the #cairo_font_options_t used for Pango rendering in this widget. When not set, the default font options for the #GdkScreen will be used.
a #cairo_font_options_t, or %NULL to unset any previously set default font options.
Sets the has-tooltip property on widget to has_tooltip. See
#GtkWidget:has-tooltip for more information.
whether or not widget has a tooltip.
Specifies whether widget has a #GdkWindow of its own. Note that
all realized widgets have a non-%NULL “window” pointer
(gtk_widget_get_window() never returns a %NULL window when a widget
is realized), but for many of them it’s actually the #GdkWindow of
one of its parent widgets. Widgets that do not create a %window for
themselves in #GtkWidget::realize must announce this by
calling this function with has_window = %FALSE.
This function should only be called by widget implementations, and they should call it in their init() function.
whether or not widget has a window.
Sets whether the widget would like any available extra horizontal space. When a user resizes a #GtkWindow, widgets with expand=TRUE generally receive the extra space. For example, a list or scrollable area or document in your window would often be set to expand.
Call this function to set the expand flag if you would like your widget to become larger horizontally when the window has extra room.
By default, widgets automatically expand if any of their children want to expand. (To see if a widget will automatically expand given its current children and state, call gtk_widget_compute_expand(). A container can decide how the expandability of children affects the expansion of the container by overriding the compute_expand virtual method on #GtkWidget.).
Setting hexpand explicitly with this function will override the automatic expand behavior.
This function forces the widget to expand or not to expand, regardless of children. The override occurs because gtk_widget_set_hexpand() sets the hexpand-set property (see gtk_widget_set_hexpand_set()) which causes the widget’s hexpand value to be used, rather than looking at children and widget state.
whether to expand
Sets whether the hexpand flag (see gtk_widget_get_hexpand()) will be used.
The hexpand-set property will be set automatically when you call gtk_widget_set_hexpand() to set hexpand, so the most likely reason to use this function would be to unset an explicit expand flag.
If hexpand is set, then it overrides any computed expand value based on child widgets. If hexpand is not set, then the expand value depends on whether any children of the widget would like to expand.
There are few reasons to use this function, but it’s here for completeness and consistency.
value for hexpand-set property
Sets the #GtkBox:homogeneous property of box, controlling
whether or not all children of box are given equal space
in the box.
a boolean value, %TRUE to create equal allotments, %FALSE for variable allotments
Marks the widget as being mapped.
This function should only ever be called in a derived widget's “map” or “unmap” implementation.
%TRUE to mark the widget as mapped
Sets the bottom margin of widget.
See the #GtkWidget:margin-bottom property.
the bottom margin
Sets the end margin of widget.
See the #GtkWidget:margin-end property.
the end margin
Sets the left margin of widget.
See the #GtkWidget:margin-left property.
the left margin
Sets the right margin of widget.
See the #GtkWidget:margin-right property.
the right margin
Sets the start margin of widget.
See the #GtkWidget:margin-start property.
the start margin
Sets the top margin of widget.
See the #GtkWidget:margin-top property.
the top margin
Widgets can be named, which allows you to refer to them from a CSS file. You can apply a style to widgets with a particular name in the CSS file. See the documentation for the CSS syntax (on the same page as the docs for #GtkStyleContext).
Note that the CSS syntax has certain special characters to delimit and represent elements in a selector (period, #, >, *...), so using these will make your widget impossible to match by name. Any combination of alphanumeric symbols, dashes and underscores will suffice.
name for the widget
Sets the #GtkWidget:no-show-all property, which determines whether calls to gtk_widget_show_all() will affect this widget.
This is mostly for use in constructing widget hierarchies with externally controlled visibility, see #GtkUIManager.
the new value for the “no-show-all” property
Request the widget to be rendered partially transparent,
with opacity 0 being fully transparent and 1 fully opaque. (Opacity values
are clamped to the [0,1] range.).
This works on both toplevel widget, and child widgets, although there
are some limitations:
For toplevel widgets this depends on the capabilities of the windowing system. On X11 this has any effect only on X screens with a compositing manager running. See gtk_widget_is_composited(). On Windows it should work always, although setting a window’s opacity after the window has been shown causes it to flicker once on Windows.
For child widgets it doesn’t work if any affected widget has a native window, or disables double buffering.
desired opacity, between 0 and 1
Sets the orientation of the orientable.
the orientable’s new orientation.
This function is useful only when implementing subclasses of
#GtkContainer.
Sets the container as the parent of widget, and takes care of
some details such as updating the state and style of the child
to reflect its new location. The opposite function is
gtk_widget_unparent().
Sets a non default parent window for widget.
For #GtkWindow classes, setting a parent_window effects whether
the window is a toplevel window or can be embedded into other
widgets.
For #GtkWindow classes, this needs to be called before the window is realized.
Sets a property on an object.
the name of the property to set
the value
Marks the widget as being realized. This function must only be
called after all #GdkWindows for the widget have been created
and registered.
This function should only ever be called in a derived widget's “realize” or “unrealize” implementation.
%TRUE to mark the widget as realized
Sets the reallocate_redraws flag of the container to the given value.
Containers requesting reallocation redraws get automatically redrawn if any of their children changed allocation.
the new value for the container’s reallocate_redraws flag
Specifies whether widget will be treated as the default widget
within its toplevel when it has the focus, even if another widget
is the default.
See gtk_widget_grab_default() for details about the meaning of “default”.
whether or not widget can be a default widget.
Sets whether the entire widget is queued for drawing when its size allocation changes. By default, this setting is %TRUE and the entire widget is redrawn on every size change. If your widget leaves the upper left unchanged when made bigger, turning this setting off will improve performance.
Note that for widgets where gtk_widget_get_has_window() is %FALSE
setting this flag to %FALSE turns off all allocation on resizing:
the widget will not even redraw if its position changes; this is to
allow containers that don’t draw anything to avoid excess
invalidations. If you set this flag on a widget with no window that
does draw on widget->window, you are
responsible for invalidating both the old and new allocation of the
widget when the widget is moved and responsible for invalidating
regions newly when the widget increases size.
if %TRUE, the entire widget will be redrawn when it is allocated to a new size. Otherwise, only the new portion of the widget will be redrawn.
Sets the resize mode for the container.
The resize mode of a container determines whether a resize request will be passed to the container’s parent, queued for later execution or executed immediately.
the new resize mode
Sets the sensitivity of a widget. A widget is sensitive if the user can interact with it. Insensitive widgets are “grayed out” and the user can’t interact with them. Insensitive widgets are known as “inactive”, “disabled”, or “ghosted” in some other toolkits.
%TRUE to make the widget sensitive
Sets the minimum size of a widget; that is, the widget’s size
request will be at least width by height. You can use this
function to force a widget to be larger than it normally would be.
In most cases, gtk_window_set_default_size() is a better choice for toplevel windows than this function; setting the default size will still allow users to shrink the window. Setting the size request will force them to leave the window at least as large as the size request. When dealing with window sizes, gtk_window_set_geometry_hints() can be a useful function as well.
Note the inherent danger of setting any fixed size - themes, translations into other languages, different fonts, and user action can all change the appropriate size for a given widget. So, it's basically impossible to hardcode a size that will always be correct.
The size request of a widget is the smallest size a widget can accept while still functioning well and drawing itself correctly. However in some strange cases a widget may be allocated less than its requested size, and in many cases a widget may be allocated more space than it requested.
If the size request in a given direction is -1 (unset), then the “natural” size request of the widget will be used instead.
The size request set here does not include any margin from the #GtkWidget properties margin-left, margin-right, margin-top, and margin-bottom, but it does include pretty much all other padding or border properties set by any subclass of #GtkWidget.
width widget should request, or -1 to unset
height widget should request, or -1 to unset
Sets the #GtkBox:spacing property of box, which is the
number of pixels to place between children of box.
the number of pixels to put between children
This function is for use in widget implementations. Turns on flag values in the current widget state (insensitive, prelighted, etc.).
This function accepts the values %GTK_STATE_FLAG_DIR_LTR and %GTK_STATE_FLAG_DIR_RTL but ignores them. If you want to set the widget's direction, use gtk_widget_set_direction().
It is worth mentioning that any other state than %GTK_STATE_FLAG_INSENSITIVE,
will be propagated down to all non-internal children if widget is a
#GtkContainer, while %GTK_STATE_FLAG_INSENSITIVE itself will be propagated
down to all #GtkContainer children by different means than turning on the
state flag down the hierarchy, both gtk_widget_get_state_flags() and
gtk_widget_is_sensitive() will make use of these.
State flags to turn on
Whether to clear state before turning on flags
Enables or disables multiple pointer awareness. If this setting is %TRUE,
widget will start receiving multiple, per device enter/leave events. Note
that if custom #GdkWindows are created in #GtkWidget::realize,
gdk_window_set_support_multidevice() will have to be called manually on them.
%TRUE to support input from multiple devices.
Sets markup as the contents of the tooltip, which is marked up with
the [Pango text markup language][PangoMarkupFormat].
This function will take care of setting #GtkWidget:has-tooltip to %TRUE and of the default handler for the #GtkWidget::query-tooltip signal.
See also the #GtkWidget:tooltip-markup property and gtk_tooltip_set_markup().
the contents of the tooltip for widget, or %NULL
Sets text as the contents of the tooltip. This function will take
care of setting #GtkWidget:has-tooltip to %TRUE and of the default
handler for the #GtkWidget::query-tooltip signal.
See also the #GtkWidget:tooltip-text property and gtk_tooltip_set_text().
the contents of the tooltip for widget
Replaces the default window used for displaying
tooltips with custom_window. GTK+ will take care of showing and
hiding custom_window at the right moment, to behave likewise as
the default tooltip window. If custom_window is %NULL, the default
tooltip window will be used.
Sets whether the widget would like any available extra vertical space.
See gtk_widget_set_hexpand() for more detail.
whether to expand
Sets whether the vexpand flag (see gtk_widget_get_vexpand()) will be used.
See gtk_widget_set_hexpand_set() for more detail.
value for vexpand-set property
Sets the visibility state of widget. Note that setting this to
%TRUE doesn’t mean the widget is actually viewable, see
gtk_widget_get_visible().
This function simply calls gtk_widget_show() or gtk_widget_hide() but is nicer to use when the visibility of the widget depends on some condition.
whether the widget should be shown or not
Sets the visual that should be used for by widget and its children for creating #GdkWindows. The visual must be on the same #GdkScreen as returned by gtk_widget_get_screen(), so handling the #GtkWidget::screen-changed signal is necessary.
Setting a new visual will not cause widget to recreate its windows,
so you should call this function before widget is realized.
Sets a widget’s window. This function should only be used in a widget’s #GtkWidget::realize implementation. The %window passed is usually either new window created with gdk_window_new(), or the window of its parent widget as returned by gtk_widget_get_parent_window().
Widgets must indicate whether they will create their own #GdkWindow by calling gtk_widget_set_has_window(). This is usually done in the widget’s init() function.
Note that this function does not add any reference to window.
Flags a widget to be displayed. Any widget that isn’t shown will not appear on the screen. If you want to show all the widgets in a container, it’s easier to call gtk_widget_show_all() on the container, instead of individually showing the widgets.
Remember that you have to show the containers containing a widget, in addition to the widget itself, before it will appear onscreen.
When a toplevel container is shown, it is immediately realized and mapped; other shown widgets are realized and mapped when their toplevel container is realized and mapped.
Recursively shows a widget, and any child widgets (if the widget is a container).
Shows a widget. If the widget is an unmapped toplevel widget (i.e. a #GtkWindow that has not yet been shown), enter the main loop and wait for the window to actually be mapped. Be careful; because the main loop is running, anything can happen during this function.
This function is only used by #GtkContainer subclasses, to assign a size and position to their child widgets.
In this function, the allocation may be adjusted. It will be forced to a 1x1 minimum size, and the adjust_size_allocation virtual method on the child will be used to adjust the allocation. Standard adjustments include removing the widget’s margins, and applying the widget’s #GtkWidget:halign and #GtkWidget:valign properties.
For baseline support in containers you need to use gtk_widget_size_allocate_with_baseline() instead.
This function is only used by #GtkContainer subclasses, to assign a size, position and (optionally) baseline to their child widgets.
In this function, the allocation and baseline may be adjusted. It will be forced to a 1x1 minimum size, and the adjust_size_allocation virtual and adjust_baseline_allocation methods on the child will be used to adjust the allocation and baseline. Standard adjustments include removing the widget's margins, and applying the widget’s #GtkWidget:halign and #GtkWidget:valign properties.
If the child widget does not have a valign of %GTK_ALIGN_BASELINE the baseline argument is ignored and -1 is used instead.
position and size to be allocated to widget
The baseline of the child, or -1
This function is typically used when implementing a #GtkContainer subclass. Obtains the preferred size of a widget. The container uses this information to arrange its child widgets and decide what size allocations to give them with gtk_widget_size_allocate().
You can also call this function from an application, with some caveats. Most notably, getting a size request requires the widget to be associated with a screen, because font information may be needed. Multihead-aware applications should keep this in mind.
Also remember that the size request is not necessarily the size a widget will actually be allocated.
Remove a specified datum from the object's data associations, without invoking the association's destroy handler.
name of the key
This function gets back user data pointers stored via
g_object_set_qdata() and removes the data from object
without invoking its destroy() function (if any was
set).
Usually, calling this function is only required to update
user data pointers with a destroy notifier, for example:
void
object_add_to_user_list (GObject *object,
const gchar *new_string)
{
// the quark, naming the object data
GQuark quark_string_list = g_quark_from_static_string ("my-string-list");
// retrieve the old string list
GList *list = g_object_steal_qdata (object, quark_string_list);
// prepend new string
list = g_list_prepend (list, g_strdup (new_string));
// this changed 'list', so we need to set it again
g_object_set_qdata_full (object, quark_string_list, list, free_string_list);
}
static void
free_string_list (gpointer data)
{
GList *node, *list = data;
for (node = list; node; node = node->next)
g_free (node->data);
g_list_free (list);
}
Using g_object_get_qdata() in the above example, instead of g_object_steal_qdata() would have left the destroy function set, and thus the partial string list would have been freed upon g_object_set_qdata_full().
A #GQuark, naming the user data pointer
This function attaches the widget’s #GtkStyle to the widget's #GdkWindow. It is a replacement for
|[ widget->style = gtk_style_attach (widget->style, widget->window);
and should only ever be called in a derived widget’s “realize”
implementation which does not chain up to its parent class'
“realize” implementation, because one of the parent classes
(finally #GtkWidget) would attach the style itself.
Gets the value of a style property of widget.
the name of a style property
location to return the property value
Reverts the effect of a previous call to gtk_widget_freeze_child_notify().
This causes all queued #GtkWidget::child-notify signals on widget to be
emitted.
Reverts the effect of a previous call to
g_object_freeze_notify(). The freeze count is decreased on object
and when it reaches zero, queued "notify" signals are emitted.
Duplicate notifications for each property are squashed so that at most one #GObject::notify signal is emitted for each property, in the reverse order in which they have been queued.
It is an error to call this function when the freeze count is zero.
Translate coordinates relative to src_widget’s allocation to coordinates
relative to dest_widget’s allocations. In order to perform this
operation, both widgets must be realized, and must share a common
toplevel.
a #GtkWidget
X position relative to src_widget
Y position relative to src_widget
Triggers a tooltip query on the display where the toplevel of widget
is located. See gtk_tooltip_trigger_tooltip_query() for more
information.
This function is only for use in widget implementations. Causes a widget to be unmapped if it’s currently mapped.
This function is only for use in widget implementations. Should be called by implementations of the remove method on #GtkContainer, to dissociate a child from the container.
This function is only useful in widget implementations.
Causes a widget to be unrealized (frees all GDK resources
associated with the widget, such as widget->window).
Decreases the reference count of object. When its reference count
drops to 0, the object is finalized (i.e. its memory is freed).
If the pointer to the #GObject may be reused in future (for example, if it is an instance variable of another object), it is recommended to clear the pointer to %NULL rather than retain a dangling pointer to a potentially invalid #GObject instance. Use g_clear_object() for this.
Removes a focus chain explicitly set with gtk_container_set_focus_chain().
This function is for use in widget implementations. Turns off flag values for the current widget state (insensitive, prelighted, etc.). See gtk_widget_set_state_flags().
State flags to turn off
Adds widget to container. Typically used for simple containers
such as #GtkWindow, #GtkFrame, or #GtkButton; for more complicated
layout containers such as #GtkBox or #GtkGrid, this function will
pick default packing parameters that may not be correct. So
consider functions such as gtk_box_pack_start() and
gtk_grid_attach() as an alternative to gtk_container_add() in
those cases. A widget may be added to only one container at a time;
you can’t place the same widget inside two different containers.
Note that some containers, such as #GtkScrolledWindow or #GtkListBox, may add intermediate children between the added widget and the container.
Determines whether an accelerator that activates the signal
identified by signal_id can currently be activated.
This is done by emitting the #GtkWidget::can-activate-accel
signal on widget; if the signal isn’t overridden by a
handler or in a derived widget, then the default check is
that the widget must be sensitive, and the widget and all
its ancestors mapped.
the ID of a signal installed on widget
Emits a #GtkWidget::child-notify signal for the
[child property][child-properties] child_property
on widget.
This is the analogue of g_object_notify() for child properties.
Also see gtk_container_child_notify().
the name of a child property installed on the class of widget’s parent
Returns the type of the children supported by the container.
Note that this may return %G_TYPE_NONE to indicate that no more children can be added, e.g. for a #GtkPaned which already has two children.
This is similar to gtk_buildable_parser_finished() but is
called once for each custom tag handled by the buildable.
a #GtkBuilder
child object or %NULL for non-child tags
the name of the tag
user data created in custom_tag_start
This is called at the end of each custom element handled by the buildable.
#GtkBuilder used to construct this object
child object or %NULL for non-child tags
name of tag
user data that will be passed in to parser functions
This is called for each unknown element under <child>.
a #GtkBuilder used to construct this object
child object or %NULL for non-child tags
name of tag
Destroys a widget.
When a widget is destroyed all references it holds on other objects will be released:
It's expected that all references held on the widget will also
be released; you should connect to the #GtkWidget::destroy signal
if you hold a reference to widget and you wish to remove it when
this function is called. It is not necessary to do so if you are
implementing a #GtkContainer, as you'll be able to use the
#GtkContainerClass.remove() virtual function for that.
It's important to notice that gtk_widget_destroy() will only cause
the widget to be finalized if no additional references, acquired
using g_object_ref(), are held on it. In case additional references
are in place, the widget will be in an "inert" state after calling
this function; widget will still point to valid memory, allowing you
to release the references you hold, but you may not query the widget's
own state.
You should typically call this function on top level widgets, and rarely on child widgets.
See also: gtk_container_remove()
Rarely-used function. This function is used to emit the event signals on a widget (those signals should never be emitted without using this function to do so). If you want to synthesize an event though, don’t use this function; instead, use gtk_main_do_event() so the event will behave as if it were in the event queue. Don’t synthesize expose events; instead, use gdk_window_invalidate_rect() to invalidate a region of the window.
Invokes callback on each direct child of container, including
children that are considered “internal” (implementation details
of the container). “Internal” children generally weren’t added
by the user of the container, but were added by the container
implementation itself.
Most applications should use gtk_container_foreach(), rather than gtk_container_forall().
Returns the accessible object that describes the widget to an assistive technology.
If accessibility support is not available, this #AtkObject instance may be a no-op. Likewise, if no class-specific #AtkObject implementation is available for the widget instance in question, it will inherit an #AtkObject implementation from the first ancestor class for which such an implementation is defined.
The documentation of the ATK library contains more information about accessible objects and their uses.
Gets the name of the buildable object.
#GtkBuilder sets the name based on the
[GtkBuilder UI definition][BUILDER-UI]
used to construct the buildable.
Returns a newly created widget path representing all the widget hierarchy
from the toplevel down to and including child.
Retrieves a widget’s initial minimum and natural height.
This call is specific to width-for-height requests.
The returned request will be modified by the GtkWidgetClass::adjust_size_request virtual method and by any #GtkSizeGroups that have been applied. That is, the returned request is the one that should be used for layout, not necessarily the one returned by the widget itself.
Retrieves a widget’s minimum and natural height and the corresponding baselines if it would be given
the specified width, or the default height if width is -1. The baselines may be -1 which means
that no baseline is requested for this widget.
The returned request will be modified by the GtkWidgetClass::adjust_size_request and GtkWidgetClass::adjust_baseline_request virtual methods and by any #GtkSizeGroups that have been applied. That is, the returned request is the one that should be used for layout, not necessarily the one returned by the widget itself.
the width which is available for allocation, or -1 if none
Retrieves a widget’s minimum and natural height if it would be given
the specified width.
The returned request will be modified by the GtkWidgetClass::adjust_size_request virtual method and by any #GtkSizeGroups that have been applied. That is, the returned request is the one that should be used for layout, not necessarily the one returned by the widget itself.
the width which is available for allocation
Retrieves a widget’s initial minimum and natural width.
This call is specific to height-for-width requests.
The returned request will be modified by the GtkWidgetClass::adjust_size_request virtual method and by any #GtkSizeGroups that have been applied. That is, the returned request is the one that should be used for layout, not necessarily the one returned by the widget itself.
Retrieves a widget’s minimum and natural width if it would be given
the specified height.
The returned request will be modified by the GtkWidgetClass::adjust_size_request virtual method and by any #GtkSizeGroups that have been applied. That is, the returned request is the one that should be used for layout, not necessarily the one returned by the widget itself.
the height which is available for allocation
Gets whether the widget prefers a height-for-width layout or a width-for-height layout.
#GtkBin widgets generally propagate the preference of their child, container widgets need to request something either in context of their children or in context of their allocation capabilities.
Causes widget to have the keyboard focus for the #GtkWindow it's
inside. widget must be a focusable widget, such as a #GtkEntry;
something like #GtkFrame won’t work.
More precisely, it must have the %GTK_CAN_FOCUS flag set. Use gtk_widget_set_can_focus() to modify that flag.
The widget also needs to be realized and mapped. This is indicated by the related signals. Grabbing the focus immediately after creating the widget will likely fail and cause critical warnings.
Reverses the effects of gtk_widget_show(), causing the widget to be hidden (invisible to the user).
This function should be called whenever keyboard navigation within a single widget hits a boundary. The function emits the #GtkWidget::keynav-failed signal on the widget and its return value should be interpreted in a way similar to the return value of gtk_widget_child_focus():
When %TRUE is returned, stay in the widget, the failed keyboard navigation is OK and/or there is nowhere we can/should move the focus to.
When %FALSE is returned, the caller should continue with keyboard navigation outside the widget, e.g. by calling gtk_widget_child_focus() on the widget’s toplevel.
The default ::keynav-failed handler returns %FALSE for %GTK_DIR_TAB_FORWARD and %GTK_DIR_TAB_BACKWARD. For the other values of #GtkDirectionType it returns %TRUE.
Whenever the default handler returns %TRUE, it also calls gtk_widget_error_bell() to notify the user of the failed keyboard navigation.
A use case for providing an own implementation of ::keynav-failed (either by connecting to it or by overriding it) would be a row of #GtkEntry widgets where the user should be able to navigate the entire row with the cursor keys, as e.g. known from user interfaces that require entering license keys.
direction of focus movement
This function is only for use in widget implementations. Causes a widget to be mapped if it isn’t already.
Emits the #GtkWidget::mnemonic-activate signal.
%TRUE if there are other widgets with the same mnemonic
Emits a "notify" signal for the property property_name on object.
When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.
Note that emission of the notify signal may be blocked with g_object_freeze_notify(). In this case, the signal emissions are queued and will be emitted (in reverse order) when g_object_thaw_notify() is called.
Invalidates the area of widget defined by region by calling
gdk_window_invalidate_region() on the widget’s window and all its
child windows. Once the main loop becomes idle (after the current
batch of events has been processed, roughly), the window will
receive expose events for the union of all regions that have been
invalidated.
Normally you would only use this function in widget implementations. You might also use it to schedule a redraw of a #GtkDrawingArea or some portion thereof.
Creates the GDK (windowing system) resources associated with a
widget. For example, widget->window will be created when a widget
is realized. Normally realization happens implicitly; if you show
a widget and all its parent containers, then the widget will be
realized and mapped automatically.
Realizing a widget requires all
the widget’s parent widgets to be realized; calling
gtk_widget_realize() realizes the widget’s parents in addition to
widget itself. If a widget is not yet inside a toplevel window
when you realize it, bad things will happen.
This function is primarily used in widget implementations, and isn’t very useful otherwise. Many times when you think you might need it, a better approach is to connect to a signal that will be called after the widget is realized automatically, such as #GtkWidget::draw. Or simply g_signal_connect () to the #GtkWidget::realize signal.
Removes widget from container. widget must be inside container.
Note that container will own a reference to widget, and that this
may be the last reference held; so removing a widget from its
container can destroy that widget. If you want to use widget
again, you need to add a reference to it before removing it from
a container, using g_object_ref(). If you don’t want to use widget
again it’s usually more efficient to simply destroy it directly
using gtk_widget_destroy() since this will remove it from the
container and help break any circular reference count cycles.
Sets, or unsets if child is %NULL, the focused child of container.
This function emits the GtkContainer::set_focus_child signal of
container. Implementations of #GtkContainer can override the
default behaviour by overriding the class closure of this signal.
This is function is mostly meant to be used by widgets. Applications can use gtk_widget_grab_focus() to manually set the focus to a specific widget.
Sets the name of the buildable object.
name to set
Flags a widget to be displayed. Any widget that isn’t shown will not appear on the screen. If you want to show all the widgets in a container, it’s easier to call gtk_widget_show_all() on the container, instead of individually showing the widgets.
Remember that you have to show the containers containing a widget, in addition to the widget itself, before it will appear onscreen.
When a toplevel container is shown, it is immediately realized and mapped; other shown widgets are realized and mapped when their toplevel container is realized and mapped.
Recursively shows a widget, and any child widgets (if the widget is a container).
This function is only used by #GtkContainer subclasses, to assign a size and position to their child widgets.
In this function, the allocation may be adjusted. It will be forced to a 1x1 minimum size, and the adjust_size_allocation virtual method on the child will be used to adjust the allocation. Standard adjustments include removing the widget’s margins, and applying the widget’s #GtkWidget:halign and #GtkWidget:valign properties.
For baseline support in containers you need to use gtk_widget_size_allocate_with_baseline() instead.
This function is only for use in widget implementations. Causes a widget to be unmapped if it’s currently mapped.
This function is only useful in widget implementations.
Causes a widget to be unrealized (frees all GDK resources
associated with the widget, such as widget->window).
This function essentially limits the life time of the closure to
the life time of the object. That is, when the object is finalized,
the closure is invalidated by calling g_closure_invalidate() on
it, in order to prevent invocations of the closure with a finalized
(nonexisting) object. Also, g_object_ref() and g_object_unref() are
added as marshal guards to the closure, to ensure that an extra
reference count is held on object during invocation of the
closure. Usually, this function will be called on closures that
use this object as closure data.
#GClosure to watch
Obtains the current default reading direction. See gtk_widget_set_default_direction().
Find the #GParamSpec with the given name for an
interface. Generally, the interface vtable passed in as g_iface
will be the default vtable from g_type_default_interface_ref(), or,
if you know the interface has already been loaded,
g_type_default_interface_peek().
any interface vtable for the interface, or the default vtable for the interface
name of a property to look up.
Add a property to an interface; this is only useful for interfaces that are added to GObject-derived types. Adding a property to an interface forces all objects classes with that interface to have a compatible property. The compatible property could be a newly created #GParamSpec, but normally g_object_class_override_property() will be used so that the object class only needs to provide an implementation and inherits the property description, default value, bounds, and so forth from the interface property.
This function is meant to be called from the interface's default
vtable initialization function (the class_init member of
#GTypeInfo.) It must not be called after after class_init has
been called for any object types implementing this interface.
If pspec is a floating reference, it will be consumed.
any interface vtable for the interface, or the default vtable for the interface.
the #GParamSpec for the new property
Lists the properties of an interface.Generally, the interface
vtable passed in as g_iface will be the default vtable from
g_type_default_interface_ref(), or, if you know the interface has
already been loaded, g_type_default_interface_peek().
any interface vtable for the interface, or the default vtable for the interface
Creates a new #GtkBox.
the box’s orientation.
the number of pixels to place by default between children.
Creates a new instance of a #GObject subtype and sets its properties.
Construction parameters (see %G_PARAM_CONSTRUCT, %G_PARAM_CONSTRUCT_ONLY) which are not explicitly specified are set to their default values.
the type id of the #GObject subtype to instantiate
an array of #GParameter
Cancels the effect of a previous call to gtk_widget_push_composite_child().
Makes all newly-created widgets as composite children until the corresponding gtk_widget_pop_composite_child() call.
A composite child is a child that’s an implementation detail of the container it’s inside and should not be visible to people using the container. Composite children aren’t treated differently by GTK+ (but see gtk_container_foreach() vs. gtk_container_forall()), but e.g. GUI builders might want to treat them in a different way.
Sets the default reading direction for widgets where the direction has not been explicitly set by gtk_widget_set_direction().
the new default direction. This cannot be %GTK_TEXT_DIR_NONE.
Whether the widget is double buffered.