Package ch.bailu.gtk.gtk

Klasse Widget

java.lang.Object
ch.bailu.gtk.type.Type
ch.bailu.gtk.type.Pointer
ch.bailu.gtk.gobject.Object
ch.bailu.gtk.type.PropertyHolder
ch.bailu.gtk.gobject.InitiallyUnowned
ch.bailu.gtk.gtk.Widget
Alle implementierten Schnittstellen:
PointerInterface
Bekannte direkte Unterklassen:
ActionBar, AppChooserButton, AppChooserWidget, AspectFrame, Avatar, Banner, Bin, BottomSheet, Box, BreakpointBin, Button, ButtonContent, Calendar, Carousel, CarouselIndicatorDots, CarouselIndicatorLines, CellView, CenterBox, CheckButton, Clamp, ClampScrollable, ColorButton, ColorChooserWidget, ColorDialogButton, ColumnView, ComboBox, Dialog, DragIcon, DrawingArea, DropDown, EditableLabel, Entry, Expander, FileChooserWidget, Fixed, Flap, FlowBox, FlowBoxChild, FontButton, FontChooserWidget, FontDialogButton, Frame, GLArea, GraphicsOffload, Grid, HeaderBar, HeaderBar, IconView, Image, InfoBar, InlineViewSwitcher, Inscription, Label, LayoutSlot, Leaflet, LevelBar, ListBase, ListBox, ListBoxRow, MediaControls, MenuButton, MultiLayoutView, NavigationPage, NavigationSplitView, NavigationView, Notebook, Overlay, OverlaySplitView, Paned, PasswordEntry, Picture, Popover, PopoverMenuBar, PreferencesGroup, PreferencesPage, ProgressBar, Range, Revealer, ScaleButton, Scrollbar, ScrolledWindow, SearchBar, SearchEntry, Separator, ShortcutLabel, ShortcutsShortcut, SpinButton, Spinner, Spinner, SplitButton, Squeezer, Stack, StackSidebar, StackSwitcher, Statusbar, StatusPage, Switch, TabBar, TabButton, TabOverview, TabView, Text, TextView, ToastOverlay, ToggleGroup, ToolbarView, TreeExpander, TreeView, Video, Viewport, ViewStack, ViewSwitcher, ViewSwitcherBar, ViewSwitcherTitle, Window, WindowControls, WindowHandle, WindowTitle, WrapBox
public class Widget extends InitiallyUnowned
The base class for all widgets.

It manages the widget lifecycle, layout, states and style.

### Height-for-width Geometry Management

GTK uses a height-for-width (and width-for-height) geometry management
system. Height-for-width means that a widget can change how much
vertical space it needs, depending on the amount of horizontal space
that it is given (and similar for width-for-height). The most common
example is a label that reflows to fill up the available width, wraps
to fewer lines, and therefore needs less height.

Height-for-width geometry management is implemented in GTK by way
of two virtual methods:

- [vfunc@Gtk.Widget.get_request_mode]
- [vfunc@Gtk.Widget.measure]

There are some important things to keep in mind when implementing
height-for-width and when using it in widget implementations.

If you implement a direct `GtkWidget` subclass that supports
height-for-width or width-for-height geometry management for itself
or its child widgets, the [vfunc@Gtk.Widget.get_request_mode] virtual
function must be implemented as well and return the widget's preferred
request mode. The default implementation of this virtual function
returns %GTK_SIZE_REQUEST_CONSTANT_SIZE, which means that the widget will
only ever get -1 passed as the for_size value to its
[vfunc@Gtk.Widget.measure] implementation.

The geometry management system will query a widget hierarchy in
only one orientation at a time. When widgets are initially queried
for their minimum sizes it is generally done in two initial passes
in the [enum@Gtk.SizeRequestMode] chosen by the toplevel.

For example, when queried in the normal %GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH mode:

First, the default minimum and natural width for each widget
in the interface will be computed using [method@Gtk.Widget.measure] with an
orientation of %GTK_ORIENTATION_HORIZONTAL and a for_size of -1.
Because the preferred widths for each widget depend on the preferred
widths of their children, this information propagates up the hierarchy,
and finally a minimum and natural width is determined for the entire
toplevel. Next, the toplevel will use the minimum width to query for the
minimum height contextual to that width using [method@Gtk.Widget.measure] with an
orientation of %GTK_ORIENTATION_VERTICAL and a for_size of the just computed
width. This will also be a highly recursive operation. The minimum height
for the minimum width is normally used to set the minimum size constraint
on the toplevel.

After the toplevel window has initially requested its size in both
dimensions it can go on to allocate itself a reasonable size (or a size
previously specified with [method@Gtk.Window.set_default_size]). During the
recursive allocation process it’s important to note that request cycles
will be recursively executed while widgets allocate their children.
Each widget, once allocated a size, will go on to first share the
space in one orientation among its children and then request each child's
height for its target allocated width or its width for allocated height,
depending. In this way a widget will typically be requested its size
a number of times before actually being allocated a size. The size a
widget is finally allocated can of course differ from the size it has
requested. For this reason, `GtkWidget` caches a small number of results
to avoid re-querying for the same sizes in one allocation cycle.

If a widget does move content around to intelligently use up the
allocated size then it must support the request in both
`GtkSizeRequestMode`s even if the widget in question only
trades sizes in a single orientation.

For instance, a [class@Gtk.Label] that does height-for-width word wrapping
will not expect to have [vfunc@Gtk.Widget.measure] with an orientation of
%GTK_ORIENTATION_VERTICAL called because that call is specific to a
width-for-height request. In this case the label must return the height
required for its own minimum possible width. By following this rule any
widget that handles height-for-width or width-for-height requests will
always be allocated at least enough space to fit its own content.

Here are some examples of how a %GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH widget
generally deals with width-for-height requests:

```c
static void
foo_widget_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum_size,
int *natural_size,
int *minimum_baseline,
int *natural_baseline)
{
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
// Calculate minimum and natural width
}
else // VERTICAL
{
if (i_am_in_height_for_width_mode)
{
int min_width, dummy;

// First, get the minimum width of our widget
GTK_WIDGET_GET_CLASS (widget)->measure (widget, GTK_ORIENTATION_HORIZONTAL, -1,
&min_width, &dummy, &dummy, &dummy);

// Now use the minimum width to retrieve the minimum and natural height to display
// that width.
GTK_WIDGET_GET_CLASS (widget)->measure (widget, GTK_ORIENTATION_VERTICAL, min_width,
minimum_size, natural_size, &dummy, &dummy);
}
else
{
// ... some widgets do both.
}
}
}
```

Often a widget needs to get its own request during size request or
allocation. For example, when computing height it may need to also
compute width. Or when deciding how to use an allocation, the widget
may need to know its natural size. In these cases, the widget should
be careful to call its virtual methods directly, like in the code
example above.

It will not work to use the wrapper function [method@Gtk.Widget.measure]
inside your own [vfunc@Gtk.Widget.size_allocate] implementation.
These return a request adjusted by [class@Gtk.SizeGroup], the widget's
align and expand flags, as well as its CSS style.

If a widget used the wrappers inside its virtual method implementations,
then the adjustments (such as widget margins) would be applied
twice. GTK therefore does not allow this and will warn if you try
to do it.

Of course if you are getting the size request for another widget, such
as a child widget, you must use [method@Gtk.Widget.measure]; otherwise, you
would not properly consider widget margins, [class@Gtk.SizeGroup], and
so forth.

GTK also supports baseline vertical alignment of widgets. This
means that widgets are positioned such that the typographical baseline of
widgets in the same row are aligned. This happens if a widget supports
baselines, has a vertical alignment using baselines, and is inside
a widget that supports baselines and has a natural “row” that it aligns to
the baseline, or a baseline assigned to it by the grandparent.

Baseline alignment support for a widget is also done by the
[vfunc@Gtk.Widget.measure] virtual function. It allows you to report
both a minimum and natural size.

If a widget ends up baseline aligned it will be allocated all the space in
the parent as if it was %GTK_ALIGN_FILL, but the selected baseline can be
found via [method@Gtk.Widget.get_baseline]. If the baseline has a
value other than -1 you need to align the widget such that the baseline
appears at the position.

### GtkWidget as GtkBuildable

The `GtkWidget` implementation of the `GtkBuildable` interface
supports various custom elements to specify additional aspects of widgets
that are not directly expressed as properties.

If the widget uses a [class@Gtk.LayoutManager], `GtkWidget` supports
a custom `<layout>` element, used to define layout properties:

```xml
<object class="GtkGrid" id="my_grid">
<child>
<object class="GtkLabel" id="label1">
<property name="label">Description</property>
<layout>
<property name="column">0</property>
<property name="row">0</property>
<property name="row-span">1</property>
<property name="column-span">1</property>
</layout>
</object>
</child>
<child>
<object class="GtkEntry" id="description_entry">
<layout>
<property name="column">1</property>
<property name="row">0</property>
<property name="row-span">1</property>
<property name="column-span">1</property>
</layout>
</object>
</child>
</object>
```

`GtkWidget` allows style information such as style classes to
be associated with widgets, using the custom `<style>` element:

```xml
<object class="GtkButton" id="button1">
<style>
<class name="my-special-button-class"/>
<class name="dark-button"/>
</style>
</object>
```

`GtkWidget` allows defining accessibility information, such as properties,
relations, and states, using the custom `<accessibility>` element:

```xml
<object class="GtkButton" id="button1">
<accessibility>
<property name="label">Download</property>
<relation name="labelled-by">label1</relation>
</accessibility>
</object>
```

### Building composite widgets from template XML

`GtkWidget `exposes some facilities to automate the procedure
of creating composite widgets using "templates".

To create composite widgets with `GtkBuilder` XML, one must associate
the interface description with the widget class at class initialization
time using [method@Gtk.WidgetClass.set_template].

The interface description semantics expected in composite template descriptions
is slightly different from regular [class@Gtk.Builder] XML.

Unlike regular interface descriptions, [method@Gtk.WidgetClass.set_template]
will expect a `<template>` tag as a direct child of the toplevel
`<interface>` tag. The `<template>` tag must specify the “class” attribute
which must be the type name of the widget. Optionally, the “parent”
attribute may be specified to specify the direct parent type of the widget
type; this is ignored by `GtkBuilder` but can be used by UI design tools to
introspect what kind of properties and internal children exist for a given
type when the actual type does not exist.

The XML which is contained inside the `<template>` tag behaves as if it were
added to the `<object>` tag defining the widget itself. You may set properties
on a widget by inserting `<property>` tags into the `<template>` tag, and also
add `<child>` tags to add children and extend a widget in the normal way you
would with `<object>` tags.

Additionally, `<object>` tags can also be added before and after the initial
`<template>` tag in the normal way, allowing one to define auxiliary objects
which might be referenced by other widgets declared as children of the
`<template>` tag.

Since, unlike the `<object>` tag, the `<template>` tag does not contain an
“id” attribute, if you need to refer to the instance of the object itself that
the template will create, simply refer to the template class name in an
applicable element content.

Here is an example of a template definition, which includes an example of
this in the `<signal>` tag:

```xml
<interface>
<template class="FooWidget" parent="GtkBox">
<property name="orientation">horizontal</property>
<property name="spacing">4</property>
<child>
<object class="GtkButton" id="hello_button">
<property name="label">Hello World</property>
<signal name="clicked" handler="hello_button_clicked" object="FooWidget" swapped="yes"/>
</object>
</child>
<child>
<object class="GtkButton" id="goodbye_button">
<property name="label">Goodbye World</property>
</object>
</child>
</template>
</interface>
```

Typically, you'll place the template fragment into a file that is
bundled with your project, using `GResource`. In order to load the
template, you need to call [method@Gtk.WidgetClass.set_template_from_resource]
from the class initialization of your `GtkWidget` type:

```c
static void
foo_widget_class_init (FooWidgetClass *klass)
{
// ...

gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (klass),
"/com/example/ui/foowidget.ui");
}
```

You will also need to call [method@Gtk.Widget.init_template] from the
instance initialization function:

```c
static void
foo_widget_init (FooWidget *self)
{
gtk_widget_init_template (GTK_WIDGET (self));

// Initialize the rest of the widget...
}
```

as well as calling [method@Gtk.Widget.dispose_template] from the dispose
function:

```c
static void
foo_widget_dispose (GObject *gobject)
{
FooWidget *self = FOO_WIDGET (gobject);

// Dispose objects for which you have a reference...

// Clear the template children for this widget type
gtk_widget_dispose_template (GTK_WIDGET (self), FOO_TYPE_WIDGET);

G_OBJECT_CLASS (foo_widget_parent_class)->dispose (gobject);
}
```

You can access widgets defined in the template using the
[method@Gtk.Widget.get_template_child] function, but you will typically declare
a pointer in the instance private data structure of your type using the same
name as the widget in the template definition, and call
[method@Gtk.WidgetClass.bind_template_child_full] (or one of its wrapper macros
[func@Gtk.widget_class_bind_template_child] and [func@Gtk.widget_class_bind_template_child_private])
with that name, e.g.

```c
typedef struct {
GtkWidget *hello_button;
GtkWidget *goodbye_button;
} FooWidgetPrivate;

G_DEFINE_TYPE_WITH_PRIVATE (FooWidget, foo_widget, GTK_TYPE_BOX)

static void
foo_widget_dispose (GObject *gobject)
{
gtk_widget_dispose_template (GTK_WIDGET (gobject), FOO_TYPE_WIDGET);

G_OBJECT_CLASS (foo_widget_parent_class)->dispose (gobject);
}

static void
foo_widget_class_init (FooWidgetClass *klass)
{
// ...
G_OBJECT_CLASS (klass)->dispose = foo_widget_dispose;

gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (klass),
"/com/example/ui/foowidget.ui");
gtk_widget_class_bind_template_child_private (GTK_WIDGET_CLASS (klass),
FooWidget, hello_button);
gtk_widget_class_bind_template_child_private (GTK_WIDGET_CLASS (klass),
FooWidget, goodbye_button);
}

static void
foo_widget_init (FooWidget *widget)
{
gtk_widget_init_template (GTK_WIDGET (widget));
}
```

You can also use [method@Gtk.WidgetClass.bind_template_callback_full] (or
is wrapper macro [func@Gtk.widget_class_bind_template_callback]) to connect
a signal callback defined in the template with a function visible in the
scope of the class, e.g.

```c
// the signal handler has the instance and user data swapped
// because of the swapped="yes" attribute in the template XML
static void
hello_button_clicked (FooWidget *self,
GtkButton *button)
{
g_print ("Hello, world!\n");
}

static void
foo_widget_class_init (FooWidgetClass *klass)
{
// ...
gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (klass),
"/com/example/ui/foowidget.ui");
gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (klass), hello_button_clicked);
}
```

https://docs.gtk.org/gtk4/class.Widget.html

  • Felddetails

  • Konstruktordetails

  • Methodendetails

    • getClassHandler

      public static ClassHandler getClassHandler()

    • actionSetEnabled

      public void actionSetEnabled(@Nonnull Str action_name, boolean enabled)
      Enables or disables an action installed with
      [method@Gtk.WidgetClass.install_action].
      Parameter:
      action_name - action name, such as "clipboard.paste"
      enabled - whether the action is now enabled

    • actionSetEnabled

      public void actionSetEnabled(String action_name, boolean enabled)
      Enables or disables an action installed with
      [method@Gtk.WidgetClass.install_action].
      Parameter:
      action_name - action name, such as "clipboard.paste"
      enabled - whether the action is now enabled

    • activate

      public boolean activate()
      Activates the widget.

      The activation will emit the signal set using
      [method@Gtk.WidgetClass.set_activate_signal]
      during class initialization.

      Activation is what happens when you press <kbd>Enter</kbd>
      on a widget.

      If you wish to handle the activation keybinding yourself,
      it is recommended to use [method@Gtk.WidgetClass.add_shortcut]
      with an action created with [ctor@Gtk.SignalAction.new].

      If @widget is not activatable, the function returns false.
      Gibt zurück:
      true if the widget was activated

    • activateAction

      public boolean activateAction(@Nonnull Str name, @Nullable Str format_string, Object... _ellipsis)
      Activates an action for the widget.

      The action is looked up in the action groups associated with
      @widget and its ancestors.

      This is a wrapper around [method@Gtk.Widget.activate_action_variant]
      that constructs the @args variant according to @format_string.
      Parameter:
      name - the name of the action to activate
      format_string - `GVariant` format string for arguments
      _ellipsis - arguments, as given by format string
      Gibt zurück:
      true if the action was activated

    • activateAction

      public boolean activateAction(String name, String format_string, Object... _ellipsis)
      Activates an action for the widget.

      The action is looked up in the action groups associated with
      @widget and its ancestors.

      This is a wrapper around [method@Gtk.Widget.activate_action_variant]
      that constructs the @args variant according to @format_string.
      Parameter:
      name - the name of the action to activate
      format_string - `GVariant` format string for arguments
      _ellipsis - arguments, as given by format string
      Gibt zurück:
      true if the action was activated

    • activateActionVariant

      public boolean activateActionVariant(@Nonnull Str name, @Nullable Variant args)
      Activates an action for the widget.

      The action is looked up in the action groups associated with
      @widget and its ancestors.

      If the action is in an action group added with
      [method@Gtk.Widget.insert_action_group], the @name is expected
      to be prefixed with the prefix that was used when the group was
      inserted.

      The arguments must match the actions expected parameter type,
      as returned by [method@Gio.Action.get_parameter_type].
      Parameter:
      name - the name of the action to activate
      args - parameters to use
      Gibt zurück:
      true if the action was activated

    • activateActionVariant

      public boolean activateActionVariant(String name, @Nullable Variant args)
      Activates an action for the widget.

      The action is looked up in the action groups associated with
      @widget and its ancestors.

      If the action is in an action group added with
      [method@Gtk.Widget.insert_action_group], the @name is expected
      to be prefixed with the prefix that was used when the group was
      inserted.

      The arguments must match the actions expected parameter type,
      as returned by [method@Gio.Action.get_parameter_type].
      Parameter:
      name - the name of the action to activate
      args - parameters to use
      Gibt zurück:
      true if the action was activated

    • activateDefault

      public void activateDefault()
      Activates the `default.activate` action for the widget.

      The action is looked up in the same was as for
      [method@Gtk.Widget.activate_action].

    • addController

      public void addController(@Nonnull EventController controller)
      Adds an event controller to the widget.

      The event controllers of a widget handle the events that are
      propagated to the widget.

      You will usually want to call this function right after
      creating any kind of [class@Gtk.EventController].
      Parameter:
      controller - an event controller that hasn't been added to a widget yet

    • addCssClass

      public void addCssClass(@Nonnull Str css_class)
      Adds a style class to the widget.

      After calling this function, the widget’s style will match
      for @css_class, according to CSS matching rules.

      Use [method@Gtk.Widget.remove_css_class] to remove the
      style again.
      Parameter:
      css_class - style class to add to @widget, without the leading period

    • addCssClass

      public void addCssClass(String css_class)
      Adds a style class to the widget.

      After calling this function, the widget’s style will match
      for @css_class, according to CSS matching rules.

      Use [method@Gtk.Widget.remove_css_class] to remove the
      style again.
      Parameter:
      css_class - style class to add to @widget, without the leading period

    • addMnemonicLabel

      public void addMnemonicLabel(@Nonnull Widget label)
      Adds a widget to the list of mnemonic labels for this widget.

      See [method@Gtk.Widget.list_mnemonic_labels].

      Note that 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.
      Parameter:
      label - a widget that acts as a mnemonic label for @widget

    • addTickCallback

      public int addTickCallback(Widget.OnTickCallback callback, @Nullable Pointer user_data, Widget.OnDestroyNotify notify)
      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 label),
      then you will have to call [method@Gtk.Widget.queue_resize] or
      [method@Gtk.Widget.queue_draw] yourself.

      [method@Gdk.FrameClock.get_frame_time] should generally be used
      for timing continuous animations and
      [method@Gdk.FrameTimings.get_predicted_presentation_time] should be
      used if you are trying to display isolated frames at particular times.

      This is a more convenient alternative to connecting directly to the
      [signal@Gdk.FrameClock::update] signal of the frame clock, since you
      don't have to worry about when a frame clock is assigned to a widget.

      To remove a tick callback, pass the ID that is returned by this function
      to [method@Gtk.Widget.remove_tick_callback].
      Parameter:
      callback - function to call for updating animations
      user_data - data to pass to @callback
      notify - function to call to free @user_data
      Gibt zurück:
      an ID for this callback

    • allocate

      public void allocate(int width, int height, int baseline, @Nullable Transform transform)
      Assigns size, position, (optionally) a baseline and transform
      to a child widget.

      In this function, the allocation and baseline may be adjusted.
      The given allocation will be forced to be bigger than the
      widget's minimum size, as well as at least 0×0 in size.

      This function is only used by widget implementations.

      For a version that does not take a transform, see
      [method@Gtk.Widget.size_allocate].
      Parameter:
      width - new width
      height - new height
      baseline - new baseline, or -1
      transform - transformation to be applied

    • childFocus

      public boolean childFocus(int direction)
      Called by widgets as the user moves around the window using
      keyboard shortcuts.

      The @direction argument indicates what kind of motion is taking
      place (up, down, left, right, tab forward, tab backward).

      This function calls the [vfunc@Gtk.Widget.focus] virtual function;
      widgets can override the virtual function in order to implement
      appropriate focus behavior.

      The default `focus()` virtual function 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. When returning true, widgets normally call
      [method@Gtk.Widget.grab_focus] to place the focus accordingly;
      when returning false, they don’t modify the current focus location.

      This function is used by custom widget implementations; if you're
      writing an app, you’d use [method@Gtk.Widget.grab_focus] to move
      the focus to a particular widget.
      Parameter:
      direction - direction of focus movement
      Gibt zurück:
      true if focus ended up inside @widget

    • computeBounds

      public boolean computeBounds(@Nonnull Widget target, @Nonnull Rect out_bounds)
      Computes the bounds for @widget in the coordinate space of @target.

      The bounds of widget are (the bounding box of) the region that it is
      expected to draw in. See the [coordinate system](coordinates.html)
      overview to learn more.

      If the operation is successful, true is returned. If @widget has no
      bounds or the bounds cannot be expressed in @target's coordinate space
      (for example if both widgets are in different windows), false is
      returned and @bounds is set to the zero rectangle.

      It is valid for @widget and @target to be the same widget.
      Parameter:
      target - the target widget
      out_bounds - the rectangle taking the bounds
      Gibt zurück:
      true if the bounds could be computed

    • computeExpand

      public boolean computeExpand(int orientation)
      Computes whether a parent widget should give this widget
      extra space when possible.

      Widgets with children should check this, rather than looking at
      [method@Gtk.Widget.get_hexpand] or [method@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.
      Parameter:
      orientation - expand direction
      Gibt zurück:
      whether widget tree rooted here should be expanded

    • computePoint

      public boolean computePoint(@Nonnull Widget target, @Nonnull Point point, @Nonnull Point out_point)
      Translates the given @point in @widget's coordinates to coordinates
      in @target’s coordinate system.

      In order to perform this operation, both widgets must share a
      a common ancestor. If that is not the case, @out_point is set
      to (0, 0) and false is returned.
      Parameter:
      target - the widget to transform into
      point - a point in @widget's coordinate system
      out_point - set to the corresponding coordinates in @target's coordinate system
      Gibt zurück:
      true if @src_widget and @dest_widget have a common ancestor, false otherwise

    • computeTransform

      public boolean computeTransform(@Nonnull Widget target, @Nonnull Matrix out_transform)
      Computes a matrix suitable to describe a transformation from
      @widget's coordinate system into @target's coordinate system.

      The transform can not be computed in certain cases, for example
      when @widget and @target do not share a common ancestor. In that
      case @out_transform gets set to the identity matrix.

      To learn more about widget coordinate systems, see the coordinate
      system [overview](coordinates.html).
      Parameter:
      target - the target widget that the matrix will transform to
      out_transform - location to store the final transformation
      Gibt zurück:
      true if the transform could be computed

    • contains

      public boolean contains(double x, double y)
      Tests if a given point is contained in the widget.

      The coordinates for (x, y) must be in widget coordinates, so
      (0, 0) is assumed to be the top left of @widget's content area.
      Parameter:
      x - X coordinate to test, relative to @widget's origin
      y - Y coordinate to test, relative to @widget's origin
      Gibt zurück:
      true if @widget contains the point (x, y)

    • createPangoContext

      public Context createPangoContext()
      Creates a new `PangoContext` that is configured for the widget.

      The `PangoContext` will have the appropriate font map,
      font options, font description, and base direction set.

      See also [method@Gtk.Widget.get_pango_context].
      Gibt zurück:
      the new `PangoContext`

    • createPangoLayout

      public Layout createPangoLayout(@Nullable Str text)
      Creates a new `PangoLayout` that is configured for the widget.

      The `PangoLayout` will have the appropriate font map,
      font description, and base direction set.

      If you keep a `PangoLayout` created in this way around,
      you need to re-create it when the widgets `PangoContext`
      is replaced. This can be tracked by listening to changes
      of the [property@Gtk.Widget:root] property on the widget.
      Parameter:
      text - text to set on the layout
      Gibt zurück:
      the new `PangoLayout`

    • createPangoLayout

      public Layout createPangoLayout(String text)
      Creates a new `PangoLayout` that is configured for the widget.

      The `PangoLayout` will have the appropriate font map,
      font description, and base direction set.

      If you keep a `PangoLayout` created in this way around,
      you need to re-create it when the widgets `PangoContext`
      is replaced. This can be tracked by listening to changes
      of the [property@Gtk.Widget:root] property on the widget.
      Parameter:
      text - text to set on the layout
      Gibt zurück:
      the new `PangoLayout`

    • disposeTemplate

      public void disposeTemplate(long widget_type)
      Clears the template children for the widget.

      This function is the opposite of [method@Gtk.Widget.init_template],
      and it is used to clear all the template children from a widget
      instance. If you bound a template child to a field in the instance
      structure, or in the instance private data structure, the field will
      be set to `NULL` after this function returns.

      You should call this function inside the `GObjectClass.dispose()`
      implementation of any widget that called [method@Gtk.Widget.init_template].
      Typically, you will want to call this function last, right before
      chaining up to the parent type's dispose implementation, e.g.

      ```c
      static void
      some_widget_dispose (GObject *gobject)
      {
      SomeWidget *self = SOME_WIDGET (gobject);

      // Clear the template data for SomeWidget
      gtk_widget_dispose_template (GTK_WIDGET (self), SOME_TYPE_WIDGET);

      G_OBJECT_CLASS (some_widget_parent_class)->dispose (gobject);
      }
      ```
      Parameter:
      widget_type - the type of the widget to finalize the template for

    • dragCheckThreshold

      public boolean dragCheckThreshold(int start_x, int start_y, int current_x, int current_y)
      Checks to see if a drag movement has passed the GTK drag threshold.
      Parameter:
      start_x - X coordinate of start of drag
      start_y - Y coordinate of start of drag
      current_x - current X coordinate
      current_y - current Y coordinate
      Gibt zurück:
      true if the drag threshold has been passed

    • errorBell

      public void errorBell()
      Notifies the user about an input-related error on the widget.

      If the [property@Gtk.Settings:gtk-error-bell] setting is true,
      it calls [method@Gdk.Surface.beep], otherwise it does nothing.

      Note that the effect of [method@Gdk.Surface.beep] can be configured
      in many ways, depending on the windowing backend and the desktop
      environment or window manager that is used.

    • getAllocatedBaseline

      @Deprecated public int getAllocatedBaseline()
      Veraltet.
      Returns the baseline that has currently been allocated to the widget.

      This function is intended to be used when implementing handlers
      for the `GtkWidget`Class.snapshot() function, and when allocating
      child widgets in `GtkWidget`Class.size_allocate().
      Gibt zurück:
      the baseline of the @widget, or -1 if none

    • getAllocatedHeight

      @Deprecated public int getAllocatedHeight()
      Veraltet.
      Returns the height that has currently been allocated to the widget.

      To learn more about widget sizes, see the coordinate
      system [overview](coordinates.html).
      Gibt zurück:
      the height of the @widget

    • getAllocatedWidth

      @Deprecated public int getAllocatedWidth()
      Veraltet.
      Returns the width that has currently been allocated to the widget.

      To learn more about widget sizes, see the coordinate
      system [overview](coordinates.html).
      Gibt zurück:
      the width of the @widget

    • getAllocation

      @Deprecated public void getAllocation(@Nonnull Rectangle allocation)
      Veraltet.
      Retrieves the widget’s allocation.

      Note, when implementing a layout widget: a widget’s allocation
      will be its “adjusted” allocation, that is, the widget’s parent
      typically calls [method@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.
      [method@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
      [method@Gtk.Widget.size_allocate] allocation, however.

      So a layout widget is guaranteed that its children stay inside
      the assigned bounds, but not that they have exactly the bounds the
      widget assigned.
      Parameter:
      allocation - a pointer to a `GtkAllocation` to copy to

    • getAncestor

      public Widget getAncestor(long widget_type)
      Gets the first ancestor of the 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.

      Note that unlike [method@Gtk.Widget.is_ancestor], this function
      considers @widget to be an ancestor of itself.
      Parameter:
      widget_type - ancestor type
      Gibt zurück:
      the ancestor widget

    • getBaseline

      public int getBaseline()
      Returns the baseline that has currently been allocated to the widget.

      This function is intended to be used when implementing handlers
      for the `GtkWidgetClass.snapshot()` function, and when allocating
      child widgets in `GtkWidgetClass.size_allocate()`.
      Gibt zurück:
      the baseline of the @widget, or -1 if none

    • getCanFocus

      public boolean getCanFocus()
      Determines whether the input focus can enter the widget or any
      of its children.

      See [method@Gtk.Widget.set_can_focus].
      Gibt zurück:
      true if the input focus can enter @widget

    • getCanTarget

      public boolean getCanTarget()
      Queries whether the widget can be the target of pointer events.
      Gibt zurück:
      true if @widget can receive pointer events

    • getChildVisible

      public boolean getChildVisible()
      Gets the value set with [method@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 widget implementations
      and should never be called by an application.
      Gibt zurück:
      true if the widget is mapped with the parent

    • getClipboard

      public Clipboard getClipboard()
      Gets the clipboard object for the widget.

      This is a utility function to get the clipboard object for the
      display that @widget is using.

      Note that this function always works, even when @widget is not
      realized yet.
      Gibt zurück:
      the appropriate clipboard object

    • getColor

      public void getColor(@Nonnull RGBA color)
      Gets the current foreground color for the widget’s style.

      This function should only be used in snapshot
      implementations that need to do custom drawing
      with the foreground color.
      Parameter:
      color - return location for the color

    • getCssClasses

      public Strs getCssClasses()
      Returns the list of style classes applied to the widget.
      Gibt zurück:
      a `NULL`-terminated list of css classes currently applied to @widget

    • getCssName

      public Str getCssName()
      Returns the CSS name of the widget.
      Gibt zurück:
      the CSS name

    • getCursor

      public Cursor getCursor()
      Gets the cursor set on the widget.

      See [method@Gtk.Widget.set_cursor] for details.
      Gibt zurück:
      the cursor that is set on @widget

    • getDirection

      public int getDirection()
      Gets the reading direction for the widget.

      See [method@Gtk.Widget.set_direction].
      Gibt zurück:
      the reading direction for the widget

    • getDisplay

      public Display getDisplay()
      Get the display for the window that the widget belongs to.

      This function can only be called after the widget has been
      added to a widget hierarchy with a `GtkRoot` 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.
      Gibt zurück:
      the display for this widget

    • getFirstChild

      public Widget getFirstChild()
      Returns the widget’s first child.

      This function is primarily meant for widget implementations.
      Gibt zurück:
      the widget's first child

    • getFocusChild

      public Widget getFocusChild()
      Returns the focus child of the widget.
      Gibt zurück:
      the current focus child of @widget

    • getFocusOnClick

      public boolean getFocusOnClick()
      Returns whether the widget should grab focus when it is clicked
      with the mouse.

      See [method@Gtk.Widget.set_focus_on_click].
      Gibt zurück:
      true if the widget should grab focus when it is clicked with the mouse

    • getFocusable

      public boolean getFocusable()
      Determines whether the widget can own the input focus.

      See [method@Gtk.Widget.set_focusable].
      Gibt zurück:
      true if @widget can own the input focus

    • getFontMap

      public FontMap getFontMap()
      Gets the font map of the widget.

      See [method@Gtk.Widget.set_font_map].
      Gibt zurück:
      the font map of @widget

    • getFontOptions

      @Deprecated public FontOptions getFontOptions()
      Veraltet.
      Returns the `cairo_font_options_t` of the widget.

      Seee [method@Gtk.Widget.set_font_options].
      Gibt zurück:
      the `cairo_font_options_t` of widget

    • getFrameClock

      public FrameClock getFrameClock()
      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 [method@Gdk.FrameClock.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
      [method@Gdk.FrameClock.get_frame_time], and then update the animation
      by calling [method@Gdk.FrameClock.get_frame_time] again during each repaint.

      [method@Gdk.FrameClock.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 [method@Gtk.Widget.queue_draw] which invalidates the
      widget (thus scheduling it to receive a draw on the next frame).
      [method@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.
      Gibt zurück:
      the frame clock

    • getHalign

      public int getHalign()
      Gets the horizontal alignment of the widget.

      For backwards compatibility reasons this method will never return
      one of the baseline alignments, but instead it will convert it to
      [enum@Gtk.Align.fill] or [enum@Gtk.Align.center].

      Baselines are not supported for horizontal alignment.
      Gibt zurück:
      the horizontal alignment of @widget

    • getHasTooltip

      public boolean getHasTooltip()
      Returns the current value of the `has-tooltip` property.
      Gibt zurück:
      current value of `has-tooltip` on @widget

    • getHeight

      public int getHeight()
      Returns the content height of the widget.

      This function returns the height passed to its
      size-allocate implementation, which is the height you
      should be using in [vfunc@Gtk.Widget.snapshot].

      For pointer events, see [method@Gtk.Widget.contains].

      To learn more about widget sizes, see the coordinate
      system [overview](coordinates.html).
      Gibt zurück:
      The height of @widget

    • getHexpand

      public boolean getHexpand()
      Gets whether the widget would like any available extra horizontal
      space.

      When a user resizes a window, widgets with expand set to true generally
      receive the extra space. For example, a list or scrollable area
      or document in your window would often be set to expand.

      Widgets with children should use [method@Gtk.Widget.compute_expand]
      rather than this function, to see whether 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.
      Gibt zurück:
      whether hexpand flag is set

    • getHexpandSet

      public boolean getHexpandSet()
      Gets whether the `hexpand` flag has been explicitly set.

      If [property@Gtk.Widget:hexpand] property 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.
      Gibt zurück:
      whether hexpand has been explicitly set

    • getLastChild

      public Widget getLastChild()
      Returns the widget’s last child.

      This function is primarily meant for widget implementations.
      Gibt zurück:
      the widget's last child

    • getLayoutManager

      public LayoutManager getLayoutManager()
      Retrieves the layout manager of the widget.

      See [method@Gtk.Widget.set_layout_manager].
      Gibt zurück:
      the layout manager of @widget

    • getLimitEvents

      public boolean getLimitEvents()
      Gets the value of the [property@Gtk.Widget:limit-events] property.
      Gibt zurück:

    • getMapped

      public boolean getMapped()
      Returns whether the widget is mapped.
      Gibt zurück:
      true if the widget is mapped

    • getMarginBottom

      public int getMarginBottom()
      Gets the bottom margin of the widget.
      Gibt zurück:
      The bottom margin of @widget

    • getMarginEnd

      public int getMarginEnd()
      Gets the end margin of the widget.
      Gibt zurück:
      The end margin of @widget

    • getMarginStart

      public int getMarginStart()
      Gets the start margin of the widget.
      Gibt zurück:
      The start margin of @widget

    • getMarginTop

      public int getMarginTop()
      Gets the top margin of the widget.
      Gibt zurück:
      The top margin of @widget

    • getName

      public Str getName()
      Retrieves the name of a widget.

      See [method@Gtk.Widget.set_name] for the significance of widget names.
      Gibt zurück:
      name of the widget

    • getNative

      public Native getNative()
      Returns the nearest `GtkNative` ancestor of the widget.

      This function will return `NULL` if the widget is not
      contained inside a widget tree with a native ancestor.

      `GtkNative` widgets will return themselves here.
      Gibt zurück:
      the `GtkNative` ancestor of @widget

    • getNextSibling

      public Widget getNextSibling()
      Returns the widget’s next sibling.

      This function is primarily meant for widget implementations.
      Gibt zurück:
      the widget's next sibling

    • getOpacity

      public double getOpacity()
      Fetches the requested opacity for the widget.

      See [method@Gtk.Widget.set_opacity].
      Gibt zurück:
      the requested opacity for this widget

    • getOverflow

      public int getOverflow()
      Returns the widget’s overflow value.
      Gibt zurück:
      The widget's overflow value

    • getPangoContext

      public Context getPangoContext()
      Gets a `PangoContext` that is configured for the widget.

      The `PangoContext` will have the appropriate font map, font description,
      and base direction set.

      Unlike the context returned by [method@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 listening to changes of the
      [property@Gtk.Widget:root] property on the widget.
      Gibt zurück:
      the `PangoContext` for the widget

    • getParent

      public Widget getParent()
      Returns the parent widget of the widget.
      Gibt zurück:
      the parent widget of @widget

    • getPreferredSize

      public void getPreferredSize(@Nullable Requisition minimum_size, @Nullable Requisition natural_size)
      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 `GtkFixed`.

      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 [method@Gtk.Widget.measure] if you want to support baseline alignment.
      Parameter:
      minimum_size - location for storing the minimum size
      natural_size - location for storing the natural size

    • getPrevSibling

      public Widget getPrevSibling()
      Returns the widget’s previous sibling.

      This function is primarily meant for widget implementations.
      Gibt zurück:
      the widget's previous sibling

    • getPrimaryClipboard

      public Clipboard getPrimaryClipboard()
      Gets the primary clipboard of the widget.

      This is a utility function to get the primary clipboard object
      for the display that @widget is using.

      Note that this function always works, even when @widget is not
      realized yet.
      Gibt zurück:
      the appropriate clipboard object

    • getRealized

      public boolean getRealized()
      Determines whether the widget is realized.
      Gibt zurück:
      true if @widget is realized

    • getReceivesDefault

      public boolean getReceivesDefault()
      Determines whether the widget is always treated as the default widget
      within its toplevel when it has the focus, even if another widget
      is the default.

      See [method@Gtk.Widget.set_receives_default].
      Gibt zurück:
      true if @widget acts as the default widget when focused

    • getRequestMode

      public int getRequestMode()
      Gets whether the widget prefers a height-for-width layout
      or a width-for-height layout.

      Single-child widgets generally propagate the preference of
      their child, more complex widgets need to request something
      either in context of their children or in context of their
      allocation capabilities.
      Gibt zurück:
      The `GtkSizeRequestMode` preferred by @widget.

    • getRoot

      public Root getRoot()
      Returns the `GtkRoot` widget of the widget.

      This function will return `NULL` if the widget is not contained
      inside a widget tree with a root widget.

      `GtkRoot` widgets will return themselves here.
      Gibt zurück:
      the root widget of @widget

    • getScaleFactor

      public int getScaleFactor()
      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 [method@Gdk.Surface.get_scale_factor].

      Note that modern systems may support *fractional* scaling,
      where the scale factor is not an integer. On such systems,
      this function will return the next higher integer value,
      but you probably want to use [method@Gdk.Surface.get_scale]
      to get the fractional scale value.
      Gibt zurück:
      the scale factor for @widget

    • getSensitive

      public boolean getSensitive()
      Returns the widget’s sensitivity.

      This function returns the value that has been set using
      [method@Gtk.Widget.set_sensitive]).

      The effective sensitivity of a widget is however determined
      by both its own and its parent widget’s sensitivity.
      See [method@Gtk.Widget.is_sensitive].
      Gibt zurück:
      true if the widget is sensitive

    • getSettings

      public Settings getSettings()
      Gets the settings object holding the settings used for the widget.

      Note that this function can only be called when the `GtkWidget`
      is attached to a toplevel, since the settings object is specific
      to a particular display. If you want to monitor the widget for
      changes in its settings, connect to the `notify::display` signal.
      Gibt zurück:
      the relevant settings object

    • getSize

      public int getSize(int orientation)
      Returns the content width or height of the widget.

      Which dimension is returned depends on @orientation.

      This is equivalent to calling [method@Gtk.Widget.get_width]
      for [enum@Gtk.Orientation.horizontal] or [method@Gtk.Widget.get_height]
      for [enum@Gtk.Orientation.vertical], but can be used when
      writing orientation-independent code, such as when
      implementing [iface@Gtk.Orientable] widgets.

      To learn more about widget sizes, see the coordinate
      system [overview](coordinates.html).
      Parameter:
      orientation - the orientation to query
      Gibt zurück:
      the size of @widget in @orientation

    • getSizeRequest

      public void getSizeRequest(@Nullable Int width, @Nullable Int height)
      Gets the size request that was explicitly set for the widget.

      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 [method@Gtk.Widget.set_size_request].

      To get the size a widget will actually request, call
      [method@Gtk.Widget.measure] instead of this function.
      Parameter:
      width - return location for width
      height - return location for height

    • getStateFlags

      public int getStateFlags()
      Returns the widget state as a flag set.

      It is worth mentioning that the effective [flags@Gtk.StateFlags.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
      [flags@Gtk.StateFlags] to pass to a [class@Gtk.StyleContext]
      method, you should look at [method@Gtk.StyleContext.get_state].
      Gibt zurück:
      the state flags of widget

    • getStyleContext

      @Deprecated public StyleContext getStyleContext()
      Veraltet.
      Returns the style context associated to the widget.

      The returned object is guaranteed to be the same
      for the lifetime of @widget.
      Gibt zurück:
      the widgets style context

    • getTemplateChild

      public Object getTemplateChild(long widget_type, @Nonnull Str name)
      Fetches an object build from the template XML for @widget_type in
      the widget.

      This will only report children which were previously declared
      with [method@Gtk.WidgetClass.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.
      Parameter:
      widget_type - The `GType` to get a template child for
      name - ID of the child defined in the template XML
      Gibt zurück:
      the object built in the template XML with the id @name

    • getTemplateChild

      public Object getTemplateChild(long widget_type, String name)
      Fetches an object build from the template XML for @widget_type in
      the widget.

      This will only report children which were previously declared
      with [method@Gtk.WidgetClass.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.
      Parameter:
      widget_type - The `GType` to get a template child for
      name - ID of the child defined in the template XML
      Gibt zurück:
      the object built in the template XML with the id @name

    • getTooltipMarkup

      public Str getTooltipMarkup()
      Gets the contents of the tooltip for the widget.

      If the tooltip has not been set using
      [method@Gtk.Widget.set_tooltip_markup], this
      function returns `NULL`.
      Gibt zurück:
      the tooltip text

    • getTooltipText

      public Str getTooltipText()
      Gets the contents of the tooltip for the widget.

      If the @widget's tooltip was set using
      [method@Gtk.Widget.set_tooltip_markup],
      this function will return the escaped text.
      Gibt zurück:
      the tooltip text

    • getValign

      public int getValign()
      Gets the vertical alignment of the widget.
      Gibt zurück:
      the vertical alignment of @widget

    • getVexpand

      public boolean getVexpand()
      Gets whether the widget would like any available extra vertical
      space.

      See [method@Gtk.Widget.get_hexpand] for more detail.
      Gibt zurück:
      whether vexpand flag is set

    • getVexpandSet

      public boolean getVexpandSet()
      Gets whether the `vexpand` flag has been explicitly set.

      See [method@Gtk.Widget.get_hexpand_set] for more detail.
      Gibt zurück:
      whether vexpand has been explicitly set

    • getVisible

      public boolean getVisible()
      Determines whether the widget is visible.

      If you want to take into account whether the widget’s
      parent is also marked as visible, use
      [method@Gtk.Widget.is_visible] instead.

      This function does not check if the widget is
      obscured in any way.

      See [method@Gtk.Widget.set_visible].
      Gibt zurück:
      true if the widget is visible

    • getWidth

      public int getWidth()
      Returns the content width of the widget.

      This function returns the width passed to its
      size-allocate implementation, which is the width you
      should be using in [vfunc@Gtk.Widget.snapshot].

      For pointer events, see [method@Gtk.Widget.contains].

      To learn more about widget sizes, see the coordinate
      system [overview](coordinates.html).
      Gibt zurück:
      The width of @widget

    • grabFocus

      public boolean grabFocus()
      Causes @widget to have the keyboard focus for the window
      that it belongs to.

      If @widget is not focusable, or its [vfunc@Gtk.Widget.grab_focus]
      implementation cannot transfer the focus to a descendant of @widget
      that is focusable, it will not take focus and false will be returned.

      Calling [method@Gtk.Widget.grab_focus] on an already focused widget
      is allowed, should not have an effect, and return true.
      Gibt zurück:
      true if focus is now inside @widget

    • hasCssClass

      public boolean hasCssClass(@Nonnull Str css_class)
      Returns whether a style class is currently applied to the widget.
      Parameter:
      css_class - style class, without the leading period
      Gibt zurück:
      true if @css_class is currently applied to @widget

    • hasCssClass

      public boolean hasCssClass(String css_class)
      Returns whether a style class is currently applied to the widget.
      Parameter:
      css_class - style class, without the leading period
      Gibt zurück:
      true if @css_class is currently applied to @widget

    • hasDefault

      public boolean hasDefault()
      Determines whether the widget is the current default widget
      within its toplevel.
      Gibt zurück:
      true if @widget is the current default widget within its toplevel

    • hasFocus

      public boolean hasFocus()
      Determines if the widget has the global input focus.

      See [method@Gtk.Widget.is_focus] for the difference between
      having the global input focus, and only having the focus
      within a toplevel.
      Gibt zurück:
      true if the widget has the global input focus

    • hasVisibleFocus

      public boolean hasVisibleFocus()
      Determines if the widget should show a visible indication that
      it has the global input focus.

      This is a convenience function that takes into account whether
      focus indication should currently be shown in the toplevel window
      of @widget. See [method@Gtk.Window.get_focus_visible] for more
      information about focus indication.

      To find out if the widget has the global input focus, use
      [method@Gtk.Widget.has_focus].
      Gibt zurück:
      true if the widget should display a “focus rectangle”

    • hide

      @Deprecated public void hide()
      Veraltet.
      Reverses the effects of [method.Gtk.Widget.show].

      This is causing the widget to be hidden (invisible to the user).

    • inDestruction

      public boolean inDestruction()
      Returns whether the widget is currently being destroyed.

      This information can sometimes be used to avoid doing
      unnecessary work.
      Gibt zurück:
      true if @widget is being destroyed

    • initTemplate

      public void initTemplate()
      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
      [method@Gtk.WidgetClass.set_template].

      It is important to call this function in the instance initializer
      of a widget subclass and not in `GObject.constructed()` or
      `GObject.constructor()` for two reasons:

      - derived widgets will assume that the composite widgets
      defined by its parent classes have been created in their
      relative instance initializers
      - 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

      A good rule of thumb is to call this function as the first thing in
      an instance initialization function.

    • insertActionGroup

      public void insertActionGroup(@Nonnull Str name, @Nullable ActionGroup group)
      Inserts an action group into the widget's actions.

      Children of @widget that implement [iface@Gtk.Actionable] can
      then be associated with actions in @group by setting their
      “action-name” to @prefix.`action-name`.

      Note that inheritance is defined for individual actions. I.e.
      even if you insert a group with prefix @prefix, actions with
      the same prefix will still be inherited from the parent, unless
      the group contains an action with the same name.

      If @group is `NULL`, a previously inserted group for @name is
      removed from @widget.
      Parameter:
      name - the prefix for actions in @group
      group - an action group

    • insertActionGroup

      public void insertActionGroup(String name, @Nullable ActionGroup group)
      Inserts an action group into the widget's actions.

      Children of @widget that implement [iface@Gtk.Actionable] can
      then be associated with actions in @group by setting their
      “action-name” to @prefix.`action-name`.

      Note that inheritance is defined for individual actions. I.e.
      even if you insert a group with prefix @prefix, actions with
      the same prefix will still be inherited from the parent, unless
      the group contains an action with the same name.

      If @group is `NULL`, a previously inserted group for @name is
      removed from @widget.
      Parameter:
      name - the prefix for actions in @group
      group - an action group

    • insertAfter

      public void insertAfter(@Nonnull Widget parent, @Nullable Widget previous_sibling)
      Sets the parent widget of the widget.

      In contrast to [method@Gtk.Widget.set_parent], this function
      inserts @widget at a specific position into the list of children
      of the @parent widget.

      It will be placed after @previous_sibling, or at the beginning if
      @previous_sibling is `NULL`.

      After calling this function, `gtk_widget_get_prev_sibling (widget)`
      will return @previous_sibling.

      If @parent is already set as the parent widget of @widget, this
      function can also be used to reorder @widget in the child widget
      list of @parent.

      This function is primarily meant for widget implementations; if you are
      just using a widget, you *must* use its own API for adding children.
      Parameter:
      parent - the parent widget to insert @widget into
      previous_sibling - the new previous sibling of @widget

    • insertBefore

      public void insertBefore(@Nonnull Widget parent, @Nullable Widget next_sibling)
      Sets the parent widget of the widget.

      In contrast to [method@Gtk.Widget.set_parent], this function
      inserts @widget at a specific position into the list of children
      of the @parent widget.

      It will be placed before @next_sibling, or at the end if
      @next_sibling is `NULL`.

      After calling this function, `gtk_widget_get_next_sibling (widget)`
      will return @next_sibling.

      If @parent is already set as the parent widget of @widget, this function
      can also be used to reorder @widget in the child widget list of @parent.

      This function is primarily meant for widget implementations; if you are
      just using a widget, you *must* use its own API for adding children.
      Parameter:
      parent - the parent widget to insert @widget into
      next_sibling - the new next sibling of @widget

    • isAncestor

      public boolean isAncestor(@Nonnull Widget ancestor)
      Determines whether the widget is a descendent of @ancestor.
      Parameter:
      ancestor - another `GtkWidget`
      Gibt zurück:
      true if @ancestor contains @widget as a child, grandchild, great grandchild, etc

    • isDrawable

      public boolean isDrawable()
      Determines whether the widget can be drawn to.

      A widget can be drawn if it is mapped and visible.
      Gibt zurück:
      true if @widget is drawable

    • isFocus

      public boolean isFocus()
      Determines if the widget is the focus widget within its
      toplevel.

      This does not mean that the [property@Gtk.Widget:has-focus]
      property is necessarily set; [property@Gtk.Widget:has-focus]
      will only be set if the toplevel widget additionally has the
      global input focus.
      Gibt zurück:
      true if the widget is the focus widget

    • isSensitive

      public boolean isSensitive()
      Returns the widget’s effective sensitivity.

      This means it is sensitive itself and also its
      parent widget is sensitive.
      Gibt zurück:
      true if the widget is effectively sensitive

    • isVisible

      public boolean isVisible()
      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 [method@Gtk.Widget.get_visible] and
      [method@Gtk.Widget.set_visible].
      Gibt zurück:
      true if the widget and all its parents are visible

    • keynavFailed

      public boolean keynavFailed(int direction)
      Emits the [signal@Gtk.Widget::keynav-failed] signal on the widget.

      This function should be called whenever keyboard navigation
      within a single widget hits a boundary.

      The return value of this function should be interpreted
      in a way similar to the return value of
      [method@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
      [method@Gtk.Widget.child_focus] on the widget’s toplevel.

      The default [signal@Gtk.Widget::keynav-failed] handler returns
      false for [enum@Gtk.DirectionType.tab-forward] and
      [enum@Gtk.DirectionType.tab-backward]. For the other values
      of [enum@Gtk.DirectionType] it returns true.

      Whenever the default handler returns true, it also calls
      [method@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
      [class@Gtk.Entry] 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.
      Parameter:
      direction - direction of focus movement
      Gibt zurück:
      true if stopping keyboard navigation is fine, false if the emitting widget should try to handle the keyboard navigation attempt in its parent widget

    • listMnemonicLabels

      public List listMnemonicLabels()
      Returns the widgets for which this widget is the target of a
      mnemonic.

      Typically, these widgets will be labels. See, for example,
      [method@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.
      Gibt zurück:
      the list of mnemonic labels

    • map

      public void map()
      Causes a widget to be mapped if it isn’t already.

      This function is only for use in widget implementations.

    • measure

      public void measure(int orientation, int for_size, @Nullable Int minimum, @Nullable Int natural, @Nullable Int minimum_baseline, @Nullable Int natural_baseline)
      Measures @widget in the orientation @orientation and for the given @for_size.

      As an example, if @orientation is %GTK_ORIENTATION_HORIZONTAL and @for_size
      is 300, this functions will compute the minimum and natural width of @widget
      if it is allocated at a height of 300 pixels.

      See [GtkWidget’s geometry management section](class.Widget.html#height-for-width-geometry-management) for
      a more details on implementing `GtkWidgetClass.measure()`.
      Parameter:
      orientation - the orientation to measure
      for_size - Size for the opposite of @orientation, i.e. if @orientation is %GTK_ORIENTATION_HORIZONTAL, this is the height the widget should be measured with. The %GTK_ORIENTATION_VERTICAL case is analogous. This way, both height-for-width and width-for-height requests can be implemented. If no size is known, -1 can be passed.
      minimum - location to store the minimum size
      natural - location to store the natural size
      minimum_baseline - location to store the baseline position for the minimum size, or -1 to report no baseline
      natural_baseline - location to store the baseline position for the natural size, or -1 to report no baseline

    • mnemonicActivate

      public boolean mnemonicActivate(boolean group_cycling)
      Emits the [signal@Gtk.Widget::mnemonic-activate] signal.
      Parameter:
      group_cycling - true if there are other widgets with the same mnemonic
      Gibt zurück:
      true if the signal has been handled

    • observeChildren

      public ListModel observeChildren()
      Returns a list model to track the children of the widget.

      Calling this function will enable extra internal bookkeeping
      to track children and emit signals on the returned listmodel.
      It may slow down operations a lot.

      Applications should try hard to avoid calling this function
      because of the slowdowns.
      Gibt zurück:
      a list model tracking @widget's children

    • observeControllers

      public ListModel observeControllers()
      Returns a list model to track the event controllers of the widget.

      Calling this function will enable extra internal bookkeeping
      to track controllers and emit signals on the returned listmodel.
      It may slow down operations a lot.

      Applications should try hard to avoid calling this function
      because of the slowdowns.
      Gibt zurück:
      a list model tracking @widget's controllers

    • pick

      public Widget pick(double x, double y, int flags)
      Finds the descendant of the widget closest to a point.

      The point (x, y) must be given in widget coordinates, so (0, 0)
      is assumed to be the top left of @widget's content area.

      Usually widgets will return `NULL` if the given coordinate is not
      contained in @widget checked via [method@Gtk.Widget.contains].
      Otherwise they will recursively try to find a child that does
      not return `NULL`. Widgets are however free to customize their
      picking algorithm.

      This function is used on the toplevel to determine the widget
      below the mouse cursor for purposes of hover highlighting and
      delivering events.
      Parameter:
      x - x coordinate to test, relative to @widget's origin
      y - y coordinate to test, relative to @widget's origin
      flags - flags to influence what is picked
      Gibt zurück:
      the widget's descendant at (x, y)

    • queueAllocate

      public void queueAllocate()
      Flags the widget for a rerun of the [vfunc@Gtk.Widget.size_allocate]
      function.

      Use this function instead of [method@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 [method@Gtk.Widget.set_halign].

      This function is only for use in widget implementations.

    • queueDraw

      public void queueDraw()
      Schedules this widget to be redrawn.

      The redraw will happen in the paint phase
      of the current or the next frame.

      This means @widget's [vfunc@Gtk.Widget.snapshot]
      implementation will be called.

    • queueResize

      public void queueResize()
      Flags a widget to have its size renegotiated.

      This should be called when a widget for some reason has a new
      size request. For example, when you change the text in a
      [class@Gtk.Label], the label 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 [vfunc@Gtk.Widget.size_allocate]
      virtual method. Calls to gtk_widget_queue_resize() from inside
      [vfunc@Gtk.Widget.size_allocate] will be silently ignored.

      This function is only for use in widget implementations.

    • realize

      public void realize()
      Creates the GDK resources associated with a widget.

      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 this function 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
      [signal@Gtk.Widget::realize].

    • removeController

      public void removeController(@Nonnull EventController controller)
      Removes an event controller from the widget.

      The removed event controller will not receive any more events,
      and should not be used again.

      Widgets will remove all event controllers automatically when they
      are destroyed, there is normally no need to call this function.
      Parameter:
      controller - an event controller

    • removeCssClass

      public void removeCssClass(@Nonnull Str css_class)
      Removes a style from the widget.

      After this, the style of @widget will stop matching for @css_class.
      Parameter:
      css_class - style class to remove from @widget, without the leading period

    • removeCssClass

      public void removeCssClass(String css_class)
      Removes a style from the widget.

      After this, the style of @widget will stop matching for @css_class.
      Parameter:
      css_class - style class to remove from @widget, without the leading period

    • removeMnemonicLabel

      public void removeMnemonicLabel(@Nonnull Widget label)
      Removes a widget from the list of mnemonic labels for this widget.

      See [method@Gtk.Widget.list_mnemonic_labels].

      The widget must have previously been added to the list with
      [method@Gtk.Widget.add_mnemonic_label].
      Parameter:
      label - a widget that is a mnemonic label for @widget

    • removeTickCallback

      public void removeTickCallback(int id)
      Removes a tick callback previously registered with
      [method@Gtk.Widget.add_tick_callback].
      Parameter:
      id - an ID returned by [method@Gtk.Widget.add_tick_callback]

    • setCanFocus

      public void setCanFocus(boolean can_focus)
      Sets whether the input focus can enter the widget or
      any of its children.

      Applications should set @can_focus to false to mark a
      widget as for pointer/touch use only.

      Note that having @can_focus be true is only one of the
      necessary conditions for being focusable. A widget must
      also be sensitive and focusable and not have an ancestor
      that is marked as not can-focus in order to receive input
      focus.

      See [method@Gtk.Widget.grab_focus] for actually setting
      the input focus on a widget.
      Parameter:
      can_focus - whether the input focus can enter the widget or any of its children

    • setCanTarget

      public void setCanTarget(boolean can_target)
      Sets whether the widget can be the target of pointer events.
      Parameter:
      can_target - whether this widget should be able to receive pointer events

    • setChildVisible

      public void setChildVisible(boolean child_visible)
      Sets whether the widget should be mapped along with its parent.

      The child visibility can be set for widget before it is added
      to a container with [method@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 widget implementations
      and should never be called by an application.
      Parameter:
      child_visible - whether @widget should be mapped along with its parent

    • setCssClasses

      public void setCssClasses(@Nonnull Strs classes)
      Replaces the current style classes of the widget with @classes.
      Parameter:
      classes - `NULL`-terminated list of style classes

    • setCursor

      public void setCursor(@Nullable Cursor cursor)
      Sets the cursor to be shown when the pointer hovers over
      the widget.

      If the @cursor is `NULL`, @widget will use the cursor
      inherited from its parent.
      Parameter:
      cursor - the new cursor

    • setCursorFromName

      public void setCursorFromName(@Nullable Str name)
      Sets the cursor to be shown when the pointer hovers over
      the widget.

      This is a utility function that creates a cursor via
      [ctor@Gdk.Cursor.new_from_name] and then sets it on @widget
      with [method@Gtk.Widget.set_cursor]. See those functions for
      details.

      On top of that, this function allows @name to be `NULL`, which
      will do the same as calling [method@Gtk.Widget.set_cursor]
      with a `NULL` cursor.
      Parameter:
      name - the name of the cursor

    • setCursorFromName

      public void setCursorFromName(String name)
      Sets the cursor to be shown when the pointer hovers over
      the widget.

      This is a utility function that creates a cursor via
      [ctor@Gdk.Cursor.new_from_name] and then sets it on @widget
      with [method@Gtk.Widget.set_cursor]. See those functions for
      details.

      On top of that, this function allows @name to be `NULL`, which
      will do the same as calling [method@Gtk.Widget.set_cursor]
      with a `NULL` cursor.
      Parameter:
      name - the name of the cursor

    • setDirection

      public void setDirection(int dir)
      Sets the reading direction on the 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
      prevail, except for widgets where the children are arranged in
      an order that is explicitly visual rather than logical (such as
      buttons for text justification).

      If the direction is set to [enum@Gtk.TextDirection.none], then
      the value set by [func@Gtk.Widget.set_default_direction] will be used.
      Parameter:
      dir - the new direction

    • setFocusChild

      public void setFocusChild(@Nullable Widget child)
      Set the focus child of the widget.

      This function is only suitable for widget implementations.
      If you want a certain widget to get the input focus, call
      [method@Gtk.Widget.grab_focus] on it.
      Parameter:
      child - a direct child widget of @widget or `NULL` to unset the focus child

    • setFocusOnClick

      public void setFocusOnClick(boolean focus_on_click)
      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.
      Parameter:
      focus_on_click - whether the widget should grab focus when clicked with the mouse

    • setFocusable

      public void setFocusable(boolean focusable)
      Sets whether the widget can own the input focus.

      Widget implementations should set @focusable to true in
      their init() function if they want to receive keyboard input.

      Note that having @focusable be true is only one of the
      necessary conditions for being focusable. A widget must
      also be sensitive and can-focus and not have an ancestor
      that is marked as not can-focus in order to receive input
      focus.

      See [method@Gtk.Widget.grab_focus] for actually setting
      the input focus on a widget.
      Parameter:
      focusable - whether or not @widget can own the input focus

    • setFontMap

      public void setFontMap(@Nullable FontMap font_map)
      Sets the font map to use for text rendering in the widget.

      The font map is the object that is used to look up fonts.
      Setting a custom font map can be useful in special situations,
      e.g. when you need to add application-specific fonts to the set
      of available fonts.

      When not set, the widget will inherit the font map from its parent.
      Parameter:
      font_map - a `PangoFontMap`

    • setFontOptions

      @Deprecated public void setFontOptions(@Nullable FontOptions options)
      Veraltet.
      Sets the `cairo_font_options_t` used for text rendering
      in the widget.

      When not set, the default font options for the `GdkDisplay`
      will be used.
      Parameter:
      options - a `cairo_font_options_t` struct to unset any previously set default font options

    • setHalign

      public void setHalign(int align)
      Sets the horizontal alignment of the widget.
      Parameter:
      align - the horizontal alignment

    • setHasTooltip

      public void setHasTooltip(boolean has_tooltip)
      Sets the `has-tooltip` property on the widget.
      Parameter:
      has_tooltip - whether or not @widget has a tooltip

    • setHexpand

      public void setHexpand(boolean expand)
      Sets whether the widget would like any available extra horizontal
      space.

      When a user resizes a window, widgets with expand set to 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 [method@Gtk.Widget.compute_expand].
      A widget can decide how the expandability of children affects its
      own expansion 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
      [method@Gtk.Widget.set_hexpand] sets the hexpand-set property (see
      [method@Gtk.Widget.set_hexpand_set]) which causes the widget’s hexpand
      value to be used, rather than looking at children and widget state.
      Parameter:
      expand - whether to expand

    • setHexpandSet

      public void setHexpandSet(boolean set)
      Sets whether the hexpand flag will be used.

      The [property@Gtk.Widget:hexpand-set] property will be set
      automatically when you call [method@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.
      Parameter:
      set - value for hexpand-set property

    • setLayoutManager

      public void setLayoutManager(@Nullable LayoutManager layout_manager)
      Sets the layout manager to use for measuring and allocating children
      of the widget.
      Parameter:
      layout_manager - a layout manager

    • setLimitEvents

      public void setLimitEvents(boolean limit_events)
      Sets whether the widget acts like a modal dialog,
      with respect to event delivery.
      Parameter:
      limit_events - whether to limit events

    • setMarginBottom

      public void setMarginBottom(int margin)
      Sets the bottom margin of the widget.
      Parameter:
      margin - the bottom margin

    • setMarginEnd

      public void setMarginEnd(int margin)
      Sets the end margin of the widget.
      Parameter:
      margin - the end margin

    • setMarginStart

      public void setMarginStart(int margin)
      Sets the start margin of the widget.
      Parameter:
      margin - the start margin

    • setMarginTop

      public void setMarginTop(int margin)
      Sets the top margin of the widget.
      Parameter:
      margin - the top margin

    • setName

      public void setName(@Nonnull Str name)
      Sets a widgets name.

      Setting a name allows you to refer to the widget 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 [class@Gtk.StyleContext].

      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.
      Parameter:
      name - name for the widget

    • setName

      public void setName(String name)
      Sets a widgets name.

      Setting a name allows you to refer to the widget 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 [class@Gtk.StyleContext].

      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.
      Parameter:
      name - name for the widget

    • setOpacity

      public void setOpacity(double opacity)
      Requests the widget to be rendered partially transparent.

      An opacity of 0 is fully transparent and an opacity of 1
      is fully opaque.

      Opacity works on both toplevel widgets and child widgets, although
      there are some limitations: For toplevel widgets, applying opacity
      depends on the capabilities of the windowing system. On X11, this
      has any effect only on X displays with a compositing manager, see
      [method@Gdk.Display.is_composited]. On Windows and Wayland it will
      always work, although setting a window’s opacity after the window
      has been shown may cause some flicker.

      Note that the opacity is inherited through inclusion — if you set
      a toplevel to be partially translucent, all of its content will
      appear translucent, since it is ultimatively rendered on that
      toplevel. The opacity value itself is not inherited by child
      widgets (since that would make widgets deeper in the hierarchy
      progressively more translucent). As a consequence, [class@Gtk.Popover]
      instances and other [iface@Gtk.Native] widgets with their own surface
      will use their own opacity value, and thus by default appear
      non-translucent, even if they are attached to a toplevel that
      is translucent.
      Parameter:
      opacity - desired opacity, between 0 and 1

    • setOverflow

      public void setOverflow(int overflow)
      Sets how the widget treats content that is drawn outside the
      it's content area.

      See the definition of [enum@Gtk.Overflow] for details.

      This setting is provided for widget implementations and
      should not be used by application code.

      The default value is [enum@Gtk.Overflow.visible].
      Parameter:
      overflow - desired overflow value

    • setParent

      public void setParent(@Nonnull Widget parent)
      Sets the parent widget of the widget.

      This takes care of details such as updating the state and style
      of the child to reflect its new location and resizing the parent.
      The opposite function is [method@Gtk.Widget.unparent].

      This function is useful only when implementing subclasses of
      `GtkWidget`.
      Parameter:
      parent - parent widget

    • setReceivesDefault

      public void setReceivesDefault(boolean receives_default)
      Sets whether the widget will be treated as the default
      widget within its toplevel when it has the focus, even if
      another widget is the default.
      Parameter:
      receives_default - whether or not @widget can be a default widget

    • setSensitive

      public void setSensitive(boolean sensitive)
      Sets the sensitivity of the 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.
      Parameter:
      sensitive - true to make the widget sensitive

    • setSizeRequest

      public void setSizeRequest(int width, int height)
      Sets the minimum size of the 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, [method@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.

      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 is
      basically impossible to hardcode a size that will always work.

      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
      properties
      [property@Gtk.Widget:margin-start],
      [property@Gtk.Widget:margin-end],
      [property@Gtk.Widget:margin-top], and
      [property@Gtk.Widget:margin-bottom], but it does include pretty
      much all other padding or border properties set by any subclass
      of `GtkWidget`.
      Parameter:
      width - width @widget should request, or -1 to unset
      height - height @widget should request, or -1 to unset

    • setStateFlags

      public void setStateFlags(int flags, boolean clear)
      Turns on flag values in the current widget state.

      Typical widget states are insensitive, prelighted, etc.

      This function accepts the values [flags@Gtk.StateFlags.dir-ltr] and
      [flags@Gtk.StateFlags.dir-rtl] but ignores them. If you want to set
      the widget's direction, use [method@Gtk.Widget.set_direction].

      This function is for use in widget implementations.
      Parameter:
      flags - state flags to turn on
      clear - whether to clear state before turning on @flags

    • setTooltipMarkup

      public void setTooltipMarkup(@Nullable Str markup)
      Sets the contents of the tooltip for widget.

      @markup must contain Pango markup.

      This function will take care of setting the
      [property@Gtk.Widget:has-tooltip] as a side effect, and of the
      default handler for the [signal@Gtk.Widget::query-tooltip] signal.

      See also [method@Gtk.Tooltip.set_markup].
      Parameter:
      markup - the contents of the tooltip for @widget

    • setTooltipMarkup

      public void setTooltipMarkup(String markup)
      Sets the contents of the tooltip for widget.

      @markup must contain Pango markup.

      This function will take care of setting the
      [property@Gtk.Widget:has-tooltip] as a side effect, and of the
      default handler for the [signal@Gtk.Widget::query-tooltip] signal.

      See also [method@Gtk.Tooltip.set_markup].
      Parameter:
      markup - the contents of the tooltip for @widget

    • setTooltipText

      public void setTooltipText(@Nullable Str text)
      Sets the contents of the tooltip for the widget.

      If @text contains any markup, it will be escaped.

      This function will take care of setting
      [property@Gtk.Widget:has-tooltip] as a side effect,
      and of the default handler for the
      [signal@Gtk.Widget::query-tooltip] signal.

      See also [method@Gtk.Tooltip.set_text].
      Parameter:
      text - the contents of the tooltip for @widget

    • setTooltipText

      public void setTooltipText(String text)
      Sets the contents of the tooltip for the widget.

      If @text contains any markup, it will be escaped.

      This function will take care of setting
      [property@Gtk.Widget:has-tooltip] as a side effect,
      and of the default handler for the
      [signal@Gtk.Widget::query-tooltip] signal.

      See also [method@Gtk.Tooltip.set_text].
      Parameter:
      text - the contents of the tooltip for @widget

    • setValign

      public void setValign(int align)
      Sets the vertical alignment of the widget.
      Parameter:
      align - the vertical alignment

    • setVexpand

      public void setVexpand(boolean expand)
      Sets whether the widget would like any available extra vertical
      space.

      See [method@Gtk.Widget.set_hexpand] for more detail.
      Parameter:
      expand - whether to expand

    • setVexpandSet

      public void setVexpandSet(boolean set)
      Sets whether the vexpand flag will be used.

      See [method@Gtk.Widget.set_hexpand_set] for more detail.
      Parameter:
      set - value for vexpand-set property

    • setVisible

      public void setVisible(boolean visible)
      Sets the visibility state of @widget.

      Note that setting this to true doesn’t mean the widget is
      actually viewable, see [method@Gtk.Widget.get_visible].
      Parameter:
      visible - whether the widget should be shown or not

    • shouldLayout

      public boolean shouldLayout()
      Returns whether the widget should contribute to
      the measuring and allocation of its parent.

      This is false for invisible children, but also
      for children that have their own surface, such
      as [class@Gtk.Popover] instances.
      Gibt zurück:
      true if child should be included in measuring and allocating

    • show

      @Deprecated public void show()
      Veraltet.
      Flags a widget to be displayed.

      Any widget that isn’t shown will not appear on the screen.

      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 widget is shown, it is immediately realized and
      mapped; other shown widgets are realized and mapped when their
      toplevel widget is realized and mapped.

    • sizeAllocate

      public void sizeAllocate(@Nonnull Rectangle allocation, int baseline)
      Allocates widget with a transformation that translates
      the origin to the position in @allocation.

      This is a simple form of [method@Gtk.Widget.allocate].
      Parameter:
      allocation - position and size to be allocated to @widget
      baseline - the baseline of the child, or -1

    • snapshotChild

      public void snapshotChild(@Nonnull Widget child, @Nonnull Snapshot snapshot)
      Snapshots a child of the widget.

      When a widget receives a call to the snapshot function,
      it must send synthetic [vfunc@Gtk.Widget.snapshot] calls
      to all children. This function provides a convenient way
      of doing this. A widget, when it receives a call to its
      [vfunc@Gtk.Widget.snapshot] function, calls
      gtk_widget_snapshot_child() once for each child, passing in
      the @snapshot the widget received.

      This function takes care of translating the origin of @snapshot,
      and deciding whether the child needs to be snapshot.

      It does nothing for children that implement `GtkNative`.
      Parameter:
      child - a child of @widget
      snapshot - snapshot as passed to the widget. In particular, no calls to [method@Gtk.Snapshot.translate] or other transform calls should have been made

    • triggerTooltipQuery

      public void triggerTooltipQuery()
      Triggers a tooltip query on the display of the widget.

    • unmap

      public void unmap()
      Causes a widget to be unmapped if it’s currently mapped.

      This function is only for use in widget implementations.

    • unparent

      public void unparent()
      Removes @widget from its parent.

      This function is only for use in widget implementations,
      typically in dispose.

    • unrealize

      public void unrealize()
      Causes a widget to be unrealized.

      This frees all GDK resources associated with the widget.

      This function is only useful in widget implementations.

    • unsetStateFlags

      public void unsetStateFlags(int flags)
      Turns off flag values for the current widget state.

      See [method@Gtk.Widget.set_state_flags].

      This function is for use in widget implementations.
      Parameter:
      flags - state flags to turn off

    • onDestroy

      public SignalHandler onDestroy(Widget.OnDestroy signal)
      Connect to signal "destroy".
      See Widget.OnDestroy.onDestroy() for signal description.
      Field SIGNAL_ON_DESTROY contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • onDirectionChanged

      public SignalHandler onDirectionChanged(Widget.OnDirectionChanged signal)
      Connect to signal "direction-changed".
      See Widget.OnDirectionChanged.onDirectionChanged(int) for signal description.
      Field SIGNAL_ON_DIRECTION_CHANGED contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • onHide

      public SignalHandler onHide(Widget.OnHide signal)
      Connect to signal "hide".
      See Widget.OnHide.onHide() for signal description.
      Field SIGNAL_ON_HIDE contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • onKeynavFailed

      public SignalHandler onKeynavFailed(Widget.OnKeynavFailed signal)
      Connect to signal "keynav-failed".
      See Widget.OnKeynavFailed.onKeynavFailed(int) for signal description.
      Field SIGNAL_ON_KEYNAV_FAILED contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • onMap

      public SignalHandler onMap(Widget.OnMap signal)
      Connect to signal "map".
      See Widget.OnMap.onMap() for signal description.
      Field SIGNAL_ON_MAP contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • onMnemonicActivate

      public SignalHandler onMnemonicActivate(Widget.OnMnemonicActivate signal)
      Connect to signal "mnemonic-activate".
      See Widget.OnMnemonicActivate.onMnemonicActivate(boolean) for signal description.
      Field SIGNAL_ON_MNEMONIC_ACTIVATE contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • onMoveFocus

      public SignalHandler onMoveFocus(Widget.OnMoveFocus signal)
      Connect to signal "move-focus".
      See Widget.OnMoveFocus.onMoveFocus(int) for signal description.
      Field SIGNAL_ON_MOVE_FOCUS contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • onQueryTooltip

      public SignalHandler onQueryTooltip(Widget.OnQueryTooltip signal)
      Connect to signal "query-tooltip".
      See Widget.OnQueryTooltip.onQueryTooltip(int, int, boolean, ch.bailu.gtk.gtk.Tooltip) for signal description.
      Field SIGNAL_ON_QUERY_TOOLTIP contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • onRealize

      public SignalHandler onRealize(Widget.OnRealize signal)
      Connect to signal "realize".
      See Widget.OnRealize.onRealize() for signal description.
      Field SIGNAL_ON_REALIZE contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • onShow

      public SignalHandler onShow(Widget.OnShow signal)
      Connect to signal "show".
      See Widget.OnShow.onShow() for signal description.
      Field SIGNAL_ON_SHOW contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • onStateFlagsChanged

      public SignalHandler onStateFlagsChanged(Widget.OnStateFlagsChanged signal)
      Connect to signal "state-flags-changed".
      See Widget.OnStateFlagsChanged.onStateFlagsChanged(int) for signal description.
      Field SIGNAL_ON_STATE_FLAGS_CHANGED contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • onUnmap

      public SignalHandler onUnmap(Widget.OnUnmap signal)
      Connect to signal "unmap".
      See Widget.OnUnmap.onUnmap() for signal description.
      Field SIGNAL_ON_UNMAP contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • onUnrealize

      public SignalHandler onUnrealize(Widget.OnUnrealize signal)
      Connect to signal "unrealize".
      See Widget.OnUnrealize.onUnrealize() for signal description.
      Field SIGNAL_ON_UNREALIZE contains original signal name and can be used as resource reference.
      Parameter:
      signal - callback function (lambda).
      Gibt zurück:
      SignalHandler. Can be used to disconnect signal and to release callback function.

    • getDefaultDirection

      public static int getDefaultDirection()
      Obtains the default reading direction.

      See [func@Gtk.Widget.set_default_direction].
      Gibt zurück:
      the current default direction

    • setDefaultDirection

      public static void setDefaultDirection(int dir)
      Sets the default reading direction for widgets.

      See [method@Gtk.Widget.set_direction].
      Parameter:
      dir - the new default direction, either [enum@Gtk.TextDirection.ltr] or [enum@Gtk.TextDirection.rtl]

    • asAccessible

      public Accessible asAccessible()
      Implements interface Accessible. Call this to get access to interface functions.
      Gibt zurück:
      Accessible

    • asBuildable

      public Buildable asBuildable()
      Implements interface Buildable. Call this to get access to interface functions.
      Gibt zurück:
      Buildable

    • asConstraintTarget

      public ConstraintTarget asConstraintTarget()
      Implements interface ConstraintTarget. Call this to get access to interface functions.
      Gibt zurück:
      ConstraintTarget

    • getTypeID

      public static long getTypeID()

    • getParentTypeID

      public static long getParentTypeID()

    • getTypeSize

      public static TypeSystem.TypeSize getTypeSize()

    • getParentTypeSize

      public static TypeSystem.TypeSize getParentTypeSize()

    • getInstanceSize

      public static int getInstanceSize()