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.
Sets the text of tooltip to be the given string, which is marked up with the Pango text markup language. 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.
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.
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 #GtkTable, this function will
pick default packing parameters that may not be correct. So
consider functions such as gtk_box_pack_start() and
gtk_table_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.
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_RUN_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() 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.
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.
This function replaces gtk_container_focus() from GTK+ 1.2. It was necessary to check that the child was visible, sensitive, and focusable before calling gtk_container_focus(). gtk_widget_child_focus() returns %FALSE if the widget is not currently in a focusable state, so there's no need for those checks.
direction of focus movement
Emits a #GtkWidget::child-notify signal for the
child property `child_property` on `widget`.This is the analogue of g_object_notify() for child properties.
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.
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().
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, in order to notify the layout of changes to the base direction or font of this widget, you must call pango_layout_context_changed() in response to the #GtkWidget::style-set and #GtkWidget::direction-changed signals for 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. Equivalent to gtk_object_destroy(), except that you don't have to cast the widget to #GtkObject. When a widget is destroyed, it will break any references it holds to other objects. If the widget is inside a container, the widget will be removed from the container. If the widget is a toplevel (derived from #GtkWindow), it will be removed from the list of toplevels, and the reference GTK+ holds to it will be removed. Removing a widget from its container or the list of toplevels results in the widget being finalized, unless you've added additional references to the widget with g_object_ref().
In most cases, only toplevel widgets (windows) require explicit destruction, because when you destroy a toplevel its children will be destroyed as well.
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.
In GTK+ 1.2, this function would immediately render the
region area of a widget, by invoking the virtual draw method of a
widget. In GTK+ 2.0, the draw method is gone, and instead
gtk_widget_draw() simply invalidates the specified region of the
widget, then updates the invalid region of the widget immediately.
Usually you don't want to update the region immediately for
performance reasons, so in general gtk_widget_queue_draw_area() is
a better choice if you want to draw a region of a widget.
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.
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().
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 whether the event box window is above or below the windows of its child. See gtk_event_box_set_above_child() for details.
Returns the accessible object that describes the widget to an assistive technology.
If no accessibility library is loaded (i.e. no ATK implementation library is
loaded via
The documentation of the
Gets the first ancestor of widget with type widget_type. For example,
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::expose-event handler.
See gtk_widget_set_app_paintable()
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().
a #GtkRequisition to be filled in
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()).
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 for the widget (a bitfield containing flags from the #GdkEventMask enumeration). These are the events that the widget will receive.
Retrieves the extension events the widget will receive; see gdk_input_set_extension_events().
Retrieves the horizontal focus adjustment for the container. See gtk_container_set_focus_hadjustment ().
Retrieves the vertical focus adjustment for the container. See gtk_container_set_focus_vadjustment().
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().
Whether the widget is mapped.
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() and gtk_widget_hide_all() will affect this widget.
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.
If you create and keep a #PangoLayout using this context, you must deal with changes to the context by calling pango_layout_context_changed() on the layout in response to the #GtkWidget::style-set and #GtkWidget::direction-changed signals for the widget.
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 are not
#GTK_NO_WINDOW widgets, and are relative to widget->allocation.x,
widget->allocation.y for widgets that are #GTK_NO_WINDOW widgets.
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 alyways treated as default widget
withing its toplevel when it has the focus, even if another widget
is the default.
See gtk_widget_set_receives_default().
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.
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 intead. See
gtk_widget_set_size_request(). To get the size a widget will
actually use, call gtk_widget_size_request() instead of
this function.
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();
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 check if the %TOPLEVEL flags is set on the result. |[ GtkWidget *toplevel = gtk_widget_get_toplevel (widget); if (gtk_widget_is_toplevel (toplevel)) { /* Perform action on toplevel. */ }
Determines whether the widget is visible. Note that this doesn't take into account whether the widget's parent is also visible or the widget is obscured in any way.
See gtk_widget_set_visible().
Returns whether the event box has a visible window. See gtk_event_box_set_visible_window() for details.
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
Causes widget to become the default widget. widget must have the
%GTK_CAN_DEFAULT flag set; typically you have to set this flag
yourself by calling widget,
%TRUE)
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.
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.
Reverses the effects of gtk_widget_show(), causing the widget to be hidden (invisible to the user).
Recursively hides a widget and any child widgets.
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.
Sets an input shape for this widget's GDK window. This allows for windows which react to mouse click in a nonrectangular region, see gdk_window_input_shape_combine_mask() for more information.
shape to be added, or %NULL to remove an existing shape
X position of shape mask with respect to window
Y position of shape mask with respect to window
Computes the intersection of a widget's area and area, storing
the intersection in intersection, and returns %TRUE if there was
an intersection. intersection may be %NULL if you're only
interested in whether there was an intersection.
a rectangle
rectangle to store intersection of widget and area
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 sensntive
Determines whether widget is a toplevel widget. Currently only
#GtkWindow and #GtkInvisible are toplevel widgets. Toplevel
widgets have no parent widget.
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 %TRUE for %GTK_DIR_TAB_FORWARD and %GTK_DIR_TAB_BACKWARD. For the other values of #GtkDirectionType, it looks at the #GtkSettings:gtk-keynav-cursor-only setting and returns %FALSE if the setting is %TRUE. This way the entire user interface becomes cursor-navigatable on input devices such as mobile phones which only have cursor keys but no tab key.
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().
Returns a newly allocated list of the widgets, normally labels, for which this widget is a 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
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.
The default handler for this signal activates the widget if
group_cycling is %FALSE, and just grabs the focus if group_cycling
is %TRUE.
%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 #GtkWidget: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 overriden if a style is explicitely set on the widget using gtk_widget_set_style(). The #GtkRcStyle structure 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.
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 an expose event, it must send synthetic expose events to all children that don't have their own #GdkWindows. This function provides a convenient way of doing this. A container, when it receives an expose event, calls gtk_container_propagate_expose() once for each child, passing in the event the container received.
gtk_container_propagate_expose() takes care of deciding whether an expose event needs to be sent to the child, intersecting the event's area with the child area, and sending the event.
In most cases, a container can simply either simply inherit the #GtkWidget::expose implementation from #GtkContainer, or, do some drawing and then chain to the ::expose implementation from #GtkContainer.
Note that the ::expose-event signal has been replaced by a ::draw signal in GTK+ 3, and consequently, gtk_container_propagate_expose() has been replaced by gtk_container_propagate_draw(). The GTK+ 3 migration guide for hints on how to port from ::expose-event to ::draw.
a child of container
a expose event sent to container
This function does the same as gtk_widget_queue_draw().
This function is no longer different from gtk_widget_queue_draw_area(), though it once was. Now it just calls gtk_widget_queue_draw_area(). Originally gtk_widget_queue_clear_area() would force a redraw of the background for %GTK_NO_WINDOW widgets, and gtk_widget_queue_draw_area() would not. Now both functions ensure the background will be redrawn.
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
Equivalent to calling gtk_widget_queue_draw_area() for the entire area of a widget.
Invalidates the rectangular area of widget defined by x, y,
width and height by calling gdk_window_invalidate_rect() 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, or gdk_window_invalidate_rect() directly, to schedule a redraw of a #GtkDrawingArea or some portion thereof.
Frequently you can just call gdk_window_invalidate_rect() or gdk_window_invalidate_region() instead of this function. Those functions will invalidate only a single window, instead of the widget and all its children.
The advantage of adding to the invalidated region compared to simply drawing immediately is efficiency; using an invalid region ensures that you only have to redraw one time.
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
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.
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::expose-event. 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().
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 while it's not inside
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 mnemnic label for widget with gtk_widget_add_mnemonic_label().
A convenience function that uses the theme engine and RC file
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. 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
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.
Recursively resets the shape on this widget and its descendants.
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 signals on a widget. This function is not normally used directly. The only time it is used is when propagating an expose event to a child %NO_WINDOW widget, and that is normally done using gtk_container_propagate_expose().
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);
@param event a #GdkEvent of type GDK_FOCUS_CHANGE
Set whether the event box window is positioned above the windows of its child, as opposed to below it. If the window is above, all events inside the event box will go to the event box. If the window is below, events in windows of child widgets will first got to that widget, and then to its parents.
The default is to keep the window below the child.
%TRUE if the event box window is above the windows of its child
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 whether the application intends to draw on the widget in an #GtkWidget::expose-event 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. If this is not suitable (e.g. because you want to make a transparent window using an RGBA visual), you can work around this by doing: |[ gtk_widget_realize (window); gdk_window_set_back_pixmap (window->window, NULL, FALSE); gtk_widget_show (window);
@param appPaintable %TRUE if the application will paint on the widget
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, one approach is to create a #GtkAlignment widget, call gtk_widget_set_size_request() to give it a size, and place it on the side of the container as a spacer.
amount of blank space to leave
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 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 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.
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
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 explicitely 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_paint_region() and gdk_window_end_paint() are called automatically around expose events sent to the widget. gdk_window_begin_paint() diverts all drawing to a widget's window to an offscreen buffer, and gdk_window_end_paint() 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_paint()).
%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 #GTK_NO_WINDOW widgets; to get events on those widgets, place them inside a #GtkEventBox and receive events on the event box.
event mask
Sets the extension events mask to mode. See #GdkExtensionMode
and gdk_input_set_extension_events().
bitfield of extension events to receive
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 manualy 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
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 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.
Marks the widget as being realized.
This function should only ever be called in a derived widget's "map" or "unmap" implementation.
%TRUE to mark the widget as mapped
Widgets can be named, which allows you to refer to them from a gtkrc file. You can apply a style to widgets with a particular name in the gtkrc file. See the documentation for gtkrc files (on the same page as the docs for #GtkRcStyle).
Note that widget names are separated by periods in paths (see gtk_widget_path()), so names with embedded periods may cause confusion.
name for the widget
Sets the #GtkWidget:no-show-all property, which determines whether calls to gtk_widget_show_all() and gtk_widget_hide_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
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 property on an object.
the name of the property to set
the value
Marks the widget as being realized.
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 %NO_WINDOW widgets 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
%NO_WINDOW widget that 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
For widgets that support scrolling, sets the scroll adjustments and returns %TRUE. For widgets that don't support scrolling, does nothing and returns %FALSE. Widgets that don't support scrolling can be scrolled by placing them in a #GtkViewport, which does support scrolling.
an adjustment for horizontal scrolling, or %NULL
an adjustment for vertical scrolling, or %NULL
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 width by height. You can use this function to
force a widget to be either larger or smaller 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.
Widgets can't actually be allocated a size less than 1 by 1, but you can pass 0,0 to this function to mean "as small as possible."
width widget should request, or -1 to unset
height widget should request, or -1 to unset
Sets the #GtkStyle for a widget (widget->style). You probably don't
want to use this function; it interacts badly with themes, because
themes work by replacing the #GtkStyle. Instead, use
gtk_widget_modify_style().
a #GtkStyle, or %NULL to remove the effect of a previous gtk_widget_set_style() and go back to the default style
Sets markup as the contents of the tooltip, which is marked up with
the Pango text markup language.
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, usually yellow, 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.
If the custom window should have the default theming it needs to have the name "gtk-tooltip", see gtk_widget_set_name().
Sets the position of a widget. The funny "u" in the name comes from the "user position" hint specified by the X Window System, and exists for legacy reasons. This function doesn't work if a widget is inside a container; it's only really useful on #GtkWindow.
Don't use this function to center dialogs over the main application window; most window managers will do the centering on your behalf if you call gtk_window_set_transient_for(), and it's really not possible to get the centering to work correctly in all cases from application code. But if you insist, use gtk_window_set_position() to set #GTK_WIN_POS_CENTER_ON_PARENT, don't do the centering manually.
Note that although x and y can be individually unset, the position
is not honoured unless both x and y are set.
x position; -1 to unset x; -2 to leave x unchanged
y position; -1 to unset y; -2 to leave y unchanged
Sets the minimum size of a widget; that is, the widget's size
request will be width by height. You can use this function to
force a widget to be either larger or smaller than it is. The
strange "usize" name dates from the early days of GTK+, and derives
from X Window System terminology. In many 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 usize will force them
to leave the window at least as large as the usize. 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.
minimum width, or -1 to unset
minimum height, or -1 to unset
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
Set whether the event box uses a visible or invisible child window. The default is to use visible windows.
In an invisible window event box, the window that the event box creates is a %GDK_INPUT_ONLY window, which means that it is invisible and only serves to receive events.
A visible window event box creates a visible (%GDK_INPUT_OUTPUT) window that acts as the parent window for all the widgets contained in the event box.
You should generally make your event box invisible if you just want to trap events. Creating a visible window may cause artifacts that are visible to the user, especially if the user is using a theme with gradients or pixmaps.
The main reason to create a non input-only event box is if you want to set the background to a different color or draw on it.
boolean value
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.
Sets a shape for this widget's GDK window. This allows for transparent windows etc., see gdk_window_shape_combine_mask() for more information.
shape to be added, or %NULL to remove an existing shape
X position of shape mask with respect to window
Y position of shape mask with respect 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 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.
See also gtk_widget_get_child_requisition().
a #GtkRequisition to be filled in
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
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).
Inverse of gtk_widget_ref(). Equivalent to g_object_unref().
Removes a focus chain explicitly set with gtk_container_set_focus_chain().
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 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
Removes a colormap pushed with gtk_widget_push_colormap().
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.
Here is a simple example: |[ gtk_widget_push_composite_child (); scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment); gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar"); gtk_widget_pop_composite_child (); gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window)); g_object_ref (scrolled_window->hscrollbar);
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 or not the widget is double buffered.