Widget

The base class for all widgets.

GtkWidget is the base class all widgets in GTK derive from. 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 [id@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 [id@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 GtkWidget 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 GtkSizeRequestModes 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:

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 [id@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 of %GTK_ALIGN_BASELINE, 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 [id@gtk_widget_get_allocated_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:

<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:

<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:

<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 required for UI design tools like Glade 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.

An example of a template definition:

<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:

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:

static void
foo_widget_init (FooWidget *self)
{
// ...
gtk_widget_init_template (GTK_WIDGET (self));
}

You can access widgets defined in the template using the [id@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.

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

G_DEFINE_TYPE_WITH_PRIVATE (FooWidget, foo_widget, GTK_TYPE_BOX)

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_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)
{

}

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.

// 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);
}

class Widget : ObjectG , AccessibleIF , BuildableIF , ConstraintTargetIF {

protected

GtkWidget* gtkWidget;

GtkWidget* getWidgetStruct(bool transferOwnership);

void* getStruct();

this(GtkWidget* gtkWidget, bool ownedRef);

mixin AccessibleT!(GtkWidget) ;

mixin BuildableT!(GtkWidget) ;

mixin ConstraintTargetT!(GtkWidget) ;

static GType getType();

static GtkTextDirection getDefaultDirection();

static void setDefaultDirection(GtkTextDirection dir);

void actionSetEnabled(string actionName, bool enabled);

bool activate();

bool activateActionVariant(string name, Variant args);

void activateDefault();

void addController(EventController controller);

void addCssClass(string cssClass);

void addMnemonicLabel(Widget label);

uint addTickCallback(GtkTickCallback callback, void* userData, GDestroyNotify notify);

void allocate(int width, int height, int baseline, Transform transform);

bool childFocus(GtkDirectionType direction);

bool computeBounds(Widget target, Rect outBounds);

bool computeExpand(GtkOrientation orientation);

bool computePoint(Widget target, Point point, Point outPoint);

bool computeTransform(Widget target, Matrix outTransform);

bool contains(double x, double y);

PgContext createPangoContext();

PgLayout createPangoLayout(string text);

bool dragCheckThreshold(int startX, int startY, int currentX, int currentY);

void errorBell();

int getAllocatedBaseline();

int getAllocatedHeight();

int getAllocatedWidth();

void getAllocation(GtkAllocation allocation);

Widget getAncestor(GType widgetType);

bool getCanFocus();

bool getCanTarget();

bool getChildVisible();

Clipboard getClipboard();

string[] getCssClasses();

string getCssName();

Cursor getCursor();

GtkTextDirection getDirection();

Display getDisplay();

Widget getFirstChild();

Widget getFocusChild();

bool getFocusOnClick();

bool getFocusable();

PgFontMap getFontMap();

FontOption getFontOptions();

FrameClock getFrameClock();

GtkAlign getHalign();

bool getHasTooltip();

int getHeight();

bool getHexpand();

bool getHexpandSet();

Widget getLastChild();

LayoutManager getLayoutManager();

bool getMapped();

int getMarginBottom();

int getMarginEnd();

int getMarginStart();

int getMarginTop();

string getName();

NativeIF getNative();

Widget getNextSibling();

double getOpacity();

GtkOverflow getOverflow();

PgContext getPangoContext();

Widget getParent();

void getPreferredSize(Requisition minimumSize, Requisition naturalSize);

Widget getPrevSibling();

Clipboard getPrimaryClipboard();

bool getRealized();

bool getReceivesDefault();

GtkSizeRequestMode getRequestMode();

RootIF getRoot();

int getScaleFactor();

bool getSensitive();

Settings getSettings();

int getSize(GtkOrientation orientation);

void getSizeRequest(int width, int height);

GtkStateFlags getStateFlags();

StyleContext getStyleContext();

ObjectG getTemplateChild(GType widgetType, string name);

string getTooltipMarkup();

string getTooltipText();

GtkAlign getValign();

bool getVexpand();

bool getVexpandSet();

bool getVisible();

int getWidth();

bool grabFocus();

bool hasCssClass(string cssClass);

bool hasDefault();

bool hasFocus();

bool hasVisibleFocus();

void hide();

bool inDestruction();

void initTemplate();

void insertActionGroup(string name, ActionGroupIF group);

void insertAfter(Widget parent, Widget previousSibling);

void insertBefore(Widget parent, Widget nextSibling);

bool isAncestor(Widget ancestor);

bool isDrawable();

bool isFocus();

bool isSensitive();

bool isVisible();

bool keynavFailed(GtkDirectionType direction);

ListG listMnemonicLabels();

void map();

void measure(GtkOrientation orientation, int forSize, int minimum, int natural, int minimumBaseline, int naturalBaseline);

bool mnemonicActivate(bool groupCycling);

ListModelIF observeChildren();

ListModelIF observeControllers();

Widget pick(double x, double y, GtkPickFlags flags);

void queueAllocate();

void queueDraw();

void queueResize();

void realize();

void removeController(EventController controller);

void removeCssClass(string cssClass);

void removeMnemonicLabel(Widget label);

void removeTickCallback(uint id);

void setCanFocus(bool canFocus);

void setCanTarget(bool canTarget);

void setChildVisible(bool childVisible);

void setCssClasses(string[] classes);

void setCursor(Cursor cursor);

void setCursorFromName(string name);

void setDirection(GtkTextDirection dir);

void setFocusChild(Widget child);

void setFocusOnClick(bool focusOnClick);

void setFocusable(bool focusable);

void setFontMap(PgFontMap fontMap);

void setFontOptions(FontOption options);

void setHalign(GtkAlign align_);

void setHasTooltip(bool hasTooltip);

void setHexpand(bool expand);

void setHexpandSet(bool set);

void setLayoutManager(LayoutManager layoutManager);

void setMarginBottom(int margin);

void setMarginEnd(int margin);

void setMarginStart(int margin);

void setMarginTop(int margin);

void setName(string name);

void setOpacity(double opacity);

void setOverflow(GtkOverflow overflow);

void setParent(Widget parent);

void setReceivesDefault(bool receivesDefault);

void setSensitive(bool sensitive);

void setSizeRequest(int width, int height);

void setStateFlags(GtkStateFlags flags, bool clear);

void setTooltipMarkup(string markup);

void setTooltipText(string text);

void setValign(GtkAlign align_);

void setVexpand(bool expand);

void setVexpandSet(bool set);

void setVisible(bool visible);

bool shouldLayout();

void show();

void sizeAllocate(GtkAllocation* allocation, int baseline);

void snapshotChild(Widget child, Snapshot snapshot);

bool translateCoordinates(Widget destWidget, double srcX, double srcY, double destX, double destY);

void triggerTooltipQuery();

void unmap();

void unparent();

void unrealize();

void unsetStateFlags(GtkStateFlags flags);

gulong addOnDestroy(void delegate(Widget) dlg, ConnectFlags connectFlags);

gulong addOnDirectionChanged(void delegate(GtkTextDirection, Widget) dlg, ConnectFlags connectFlags);

gulong addOnHide(void delegate(Widget) dlg, ConnectFlags connectFlags);

gulong addOnKeynavFailed(bool delegate(GtkDirectionType, Widget) dlg, ConnectFlags connectFlags);

gulong addOnMap(void delegate(Widget) dlg, ConnectFlags connectFlags);

gulong addOnMnemonicActivate(bool delegate(bool, Widget) dlg, ConnectFlags connectFlags);

gulong addOnMoveFocus(void delegate(GtkDirectionType, Widget) dlg, ConnectFlags connectFlags);

gulong addOnQueryTooltip(bool delegate(int, int, bool, Tooltip, Widget) dlg, ConnectFlags connectFlags);

gulong addOnRealize(void delegate(Widget) dlg, ConnectFlags connectFlags);

gulong addOnShow(void delegate(Widget) dlg, ConnectFlags connectFlags);

gulong addOnStateFlagsChanged(void delegate(GtkStateFlags, Widget) dlg, ConnectFlags connectFlags);

gulong addOnUnmap(void delegate(Widget) dlg, ConnectFlags connectFlags);

gulong addOnUnrealize(void delegate(Widget) dlg, ConnectFlags connectFlags);

}

Constructors

this this(GtkWidget* gtkWidget, bool ownedRef): Sets our main struct and passes it to the parent class.

Members

Functions

actionSetEnabled void actionSetEnabled(string actionName, bool enabled): Enable or disable an action installed with gtk_widget_class_install_action().
activate bool activate(): For widgets that can be “activated” (buttons, menu items, etc.) this function activates them.
activateActionVariant bool activateActionVariant(string name, Variant args): Looks up the action in the action groups associated with @widget and its ancestors, and activates it.
activateDefault void activateDefault(): Activates the default.activate action from @widget.
addController void addController(EventController controller): Adds @controller to @widget so that it will receive events.
addCssClass void addCssClass(string cssClass): Adds a style class to @widget.
addMnemonicLabel void addMnemonicLabel(Widget label): Adds a widget to the list of mnemonic labels for this widget.
addOnDestroy gulong addOnDestroy(void delegate(Widget) dlg, ConnectFlags connectFlags): Signals that all holders of a reference to the widget should release the reference that they hold.
addOnDirectionChanged gulong addOnDirectionChanged(void delegate(GtkTextDirection, Widget) dlg, ConnectFlags connectFlags): Emitted when the text direction of a widget changes.
addOnHide gulong addOnHide(void delegate(Widget) dlg, ConnectFlags connectFlags): Emitted when @widget is hidden.
addOnKeynavFailed gulong addOnKeynavFailed(bool delegate(GtkDirectionType, Widget) dlg, ConnectFlags connectFlags): Emitted if keyboard navigation fails.
addOnMap gulong addOnMap(void delegate(Widget) dlg, ConnectFlags connectFlags): Emitted when @widget is going to be mapped.
addOnMnemonicActivate gulong addOnMnemonicActivate(bool delegate(bool, Widget) dlg, ConnectFlags connectFlags): Emitted when a widget is activated via a mnemonic.
addOnMoveFocus gulong addOnMoveFocus(void delegate(GtkDirectionType, Widget) dlg, ConnectFlags connectFlags): Emitted when the focus is moved.
addOnQueryTooltip gulong addOnQueryTooltip(bool delegate(int, int, bool, Tooltip, Widget) dlg, ConnectFlags connectFlags): Emitted when the widgets tooltip is about to be shown.
addOnRealize gulong addOnRealize(void delegate(Widget) dlg, ConnectFlags connectFlags): Emitted when @widget is associated with a GdkSurface.
addOnShow gulong addOnShow(void delegate(Widget) dlg, ConnectFlags connectFlags): Emitted when @widget is shown.
addOnStateFlagsChanged gulong addOnStateFlagsChanged(void delegate(GtkStateFlags, Widget) dlg, ConnectFlags connectFlags): Emitted when the widget state changes.
addOnUnmap gulong addOnUnmap(void delegate(Widget) dlg, ConnectFlags connectFlags): Emitted when @widget is going to be unmapped.
addOnUnrealize gulong addOnUnrealize(void delegate(Widget) dlg, ConnectFlags connectFlags): Emitted when the GdkSurface associated with @widget is destroyed.
addTickCallback uint addTickCallback(GtkTickCallback callback, void* userData, GDestroyNotify notify): Queues an animation frame update and adds a callback to be called before each frame.
allocate void allocate(int width, int height, int baseline, Transform transform): This function is only used by GtkWidget subclasses, to assign a size, position and (optionally) baseline to their child widgets.
childFocus bool childFocus(GtkDirectionType direction): Called by widgets as the user moves around the window using keyboard shortcuts.
computeBounds bool computeBounds(Widget target, Rect outBounds): Computes the bounds for @widget in the coordinate space of @target.
computeExpand bool computeExpand(GtkOrientation orientation): Computes whether a container should give this widget extra space when possible.
computePoint bool computePoint(Widget target, Point point, Point outPoint): Translates the given @point in @widget's coordinates to coordinates relative to @target’s coordinate system.
computeTransform bool computeTransform(Widget target, Matrix outTransform): Computes a matrix suitable to describe a transformation from @widget's coordinate system into @target's coordinate system.
contains bool contains(double x, double y): Tests if the point at (@x, @y) is contained in @widget.
createPangoContext PgContext createPangoContext(): Creates a new PangoContext with the appropriate font map, font options, font description, and base direction for drawing text for this widget.
createPangoLayout PgLayout createPangoLayout(string text): Creates a new PangoLayout with the appropriate font map, font description, and base direction for drawing text for this widget.
dragCheckThreshold bool dragCheckThreshold(int startX, int startY, int currentX, int currentY): Checks to see if a drag movement has passed the GTK drag threshold.
errorBell void errorBell(): Notifies the user about an input-related error on this widget.
getAllocatedBaseline int getAllocatedBaseline(): Returns the baseline that has currently been allocated to @widget.
getAllocatedHeight int getAllocatedHeight(): Returns the height that has currently been allocated to @widget.
getAllocatedWidth int getAllocatedWidth(): Returns the width that has currently been allocated to @widget.
getAllocation void getAllocation(GtkAllocation allocation): Retrieves the widget’s allocation.
getAncestor Widget getAncestor(GType widgetType): Gets the first ancestor of @widget with type @widget_type.
getCanFocus bool getCanFocus(): Determines whether the input focus can enter @widget or any of its children.
getCanTarget bool getCanTarget(): Queries whether @widget can be the target of pointer events.
getChildVisible bool getChildVisible(): Gets the value set with gtk_widget_set_child_visible().
getClipboard Clipboard getClipboard(): Gets the clipboard object for @widget.
getCssClasses string[] getCssClasses(): Returns the list of style classes applied to @widget.
getCssName string getCssName(): Returns the CSS name that is used for @self.
getCursor Cursor getCursor(): Queries the cursor set on @widget.
getDirection GtkTextDirection getDirection(): Gets the reading direction for a particular widget.
getDisplay Display getDisplay(): Get the GdkDisplay for the toplevel window associated with this widget.
getFirstChild Widget getFirstChild(): Returns the widgets first child.
getFocusChild Widget getFocusChild(): Returns the current focus child of @widget.
getFocusOnClick bool getFocusOnClick(): Returns whether the widget should grab focus when it is clicked with the mouse.
getFocusable bool getFocusable(): Determines whether @widget can own the input focus.
getFontMap PgFontMap getFontMap(): Gets the font map of @widget.
getFontOptions FontOption getFontOptions(): Returns the cairo_font_options_t used for Pango rendering.
getFrameClock FrameClock getFrameClock(): Obtains the frame clock for a widget.
getHalign GtkAlign getHalign(): Gets the horizontal alignment of @widget.
getHasTooltip bool getHasTooltip(): Returns the current value of the has-tooltip property.
getHeight int getHeight(): Returns the content height of the widget.
getHexpand bool getHexpand(): Gets whether the widget would like any available extra horizontal space.
getHexpandSet bool getHexpandSet(): Gets whether gtk_widget_set_hexpand() has been used to explicitly set the expand flag on this widget.
getLastChild Widget getLastChild(): Returns the widgets last child.
getLayoutManager LayoutManager getLayoutManager(): Retrieves the layout manager used by @widget
getMapped bool getMapped(): Whether the widget is mapped.
getMarginBottom int getMarginBottom(): Gets the bottom margin of @widget.
getMarginEnd int getMarginEnd(): Gets the end margin of @widget.
getMarginStart int getMarginStart(): Gets the start margin of @widget.
getMarginTop int getMarginTop(): Gets the top margin of @widget.
getName string getName(): Retrieves the name of a widget.
getNative NativeIF getNative(): Returns the GtkNative widget that contains @widget.
getNextSibling Widget getNextSibling(): Returns the widgets next sibling.
getOpacity double getOpacity(): #Fetches the requested opacity for this widget.
getOverflow GtkOverflow getOverflow(): Returns the widgets overflow value.
getPangoContext PgContext getPangoContext(): Gets a PangoContext with the appropriate font map, font description, and base direction for this widget.
getParent Widget getParent(): Returns the parent widget of @widget.
getPreferredSize void getPreferredSize(Requisition minimumSize, Requisition naturalSize): Retrieves the minimum and natural size of a widget, taking into account the widget’s preference for height-for-width management.
getPrevSibling Widget getPrevSibling(): Returns the widgets previous sibling.
getPrimaryClipboard Clipboard getPrimaryClipboard(): Gets the primary clipboard of @widget.
getRealized bool getRealized(): Determines whether @widget is realized.
getReceivesDefault bool getReceivesDefault(): Determines whether @widget is always treated as the default widget within its toplevel when it has the focus, even if another widget is the default.
getRequestMode GtkSizeRequestMode getRequestMode(): Gets whether the widget prefers a height-for-width layout or a width-for-height layout.
getRoot RootIF getRoot(): Returns the GtkRoot widget of @widget.
getScaleFactor int getScaleFactor(): Retrieves the internal scale factor that maps from window coordinates to the actual device pixels.
getSensitive bool getSensitive(): Returns the widget’s sensitivity.
getSettings Settings getSettings(): Gets the settings object holding the settings used for this widget.
getSize int getSize(GtkOrientation orientation): Returns the content width or height of the widget.
getSizeRequest void getSizeRequest(int width, int height): Gets the size request that was explicitly set for the widget using gtk_widget_set_size_request().
getStateFlags GtkStateFlags getStateFlags(): Returns the widget state as a flag set.
getStruct void* getStruct(): the main Gtk struct as a void*
getStyleContext StyleContext getStyleContext(): Returns the style context associated to @widget.
getTemplateChild ObjectG getTemplateChild(GType widgetType, string name): Fetch an object build from the template XML for @widget_type in this @widget instance.
getTooltipMarkup string getTooltipMarkup(): Gets the contents of the tooltip for @widget.
getTooltipText string getTooltipText(): Gets the contents of the tooltip for @widget.
getValign GtkAlign getValign(): Gets the vertical alignment of @widget.
getVexpand bool getVexpand(): Gets whether the widget would like any available extra vertical space.
getVexpandSet bool getVexpandSet(): Gets whether gtk_widget_set_vexpand() has been used to explicitly set the expand flag on this widget.
getVisible bool getVisible(): Determines whether the widget is visible.
getWidgetStruct GtkWidget* getWidgetStruct(bool transferOwnership): Get the main Gtk struct
getWidth int getWidth(): Returns the content width of the widget.
grabFocus bool grabFocus(): Causes @widget to have the keyboard focus for the GtkWindow it's inside.
hasCssClass bool hasCssClass(string cssClass): Returns whether @css_class is currently applied to @widget.
hasDefault bool hasDefault(): Determines whether @widget is the current default widget within its toplevel.
hasFocus bool hasFocus(): Determines if the widget has the global input focus.
hasVisibleFocus bool hasVisibleFocus(): Determines if the widget should show a visible indication that it has the global input focus.
hide void hide(): Reverses the effects of gtk_widget_show().
inDestruction bool inDestruction(): Returns whether the widget is currently being destroyed.
initTemplate void initTemplate(): Creates and initializes child widgets defined in templates.
insertActionGroup void insertActionGroup(string name, ActionGroupIF group): Inserts @group into @widget.
insertAfter void insertAfter(Widget parent, Widget previousSibling): Inserts @widget into the child widget list of @parent.
insertBefore void insertBefore(Widget parent, Widget nextSibling): Inserts @widget into the child widget list of @parent.
isAncestor bool isAncestor(Widget ancestor): Determines whether @widget is somewhere inside @ancestor, possibly with intermediate containers.
isDrawable bool isDrawable(): Determines whether @widget can be drawn to.
isFocus bool isFocus(): Determines if the widget is the focus widget within its toplevel.
isSensitive bool isSensitive(): Returns the widget’s effective sensitivity.
isVisible bool isVisible(): Determines whether the widget and all its parents are marked as visible.
keynavFailed bool keynavFailed(GtkDirectionType direction): Emits the ::keynav-failed signal on the widget.
listMnemonicLabels ListG listMnemonicLabels(): Returns the widgets for which this widget is the target of a mnemonic.
map void map(): Causes a widget to be mapped if it isn’t already.
measure void measure(GtkOrientation orientation, int forSize, int minimum, int natural, int minimumBaseline, int naturalBaseline): Measures @widget in the orientation @orientation and for the given @for_size.
mnemonicActivate bool mnemonicActivate(bool groupCycling): Emits the GtkWidget::mnemonic-activate signal.
observeChildren ListModelIF observeChildren(): Returns a GListModel to track the children of @widget.
observeControllers ListModelIF observeControllers(): Returns a GListModel to track the [class@Gtk.EventController]s of @widget.
pick Widget pick(double x, double y, GtkPickFlags flags): Finds the descendant of @widget closest to the screen at the point (@x, @y).
queueAllocate void queueAllocate(): Flags the widget for a rerun of the GtkWidgetClass::size_allocate function.
queueDraw void queueDraw(): Schedules this widget to be redrawn in paint phase of the current or the next frame.
queueResize void queueResize(): Flags a widget to have its size renegotiated.
realize void realize(): Creates the GDK resources associated with a widget.
removeController void removeController(EventController controller): Removes @controller from @widget, so that it doesn't process events anymore.
removeCssClass void removeCssClass(string cssClass): Removes a style from @widget.
removeMnemonicLabel void removeMnemonicLabel(Widget label): Removes a widget from the list of mnemonic labels for this widget.
removeTickCallback void removeTickCallback(uint id): Removes a tick callback previously registered with gtk_widget_add_tick_callback().
setCanFocus void setCanFocus(bool canFocus): Specifies whether the input focus can enter the widget or any of its children.
setCanTarget void setCanTarget(bool canTarget): Sets whether @widget can be the target of pointer events.
setChildVisible void setChildVisible(bool childVisible): Sets whether @widget should be mapped along with its parent.
setCssClasses void setCssClasses(string[] classes): Will clear all style classes applied to @widget and replace them with @classes.
setCursor void setCursor(Cursor cursor): Sets the cursor to be shown when pointer devices point towards @widget.
setCursorFromName void setCursorFromName(string name): Sets a named cursor to be shown when pointer devices point towards @widget.
setDirection void setDirection(GtkTextDirection dir): Sets the reading direction on a particular widget.
setFocusChild void setFocusChild(Widget child): Set @child as the current focus child of @widget.
setFocusOnClick void setFocusOnClick(bool focusOnClick): Sets whether the widget should grab focus when it is clicked with the mouse.
setFocusable void setFocusable(bool focusable): Specifies whether @widget can own the input focus.
setFontMap void setFontMap(PgFontMap fontMap): Sets the font map to use for Pango rendering.
setFontOptions void setFontOptions(FontOption options): Sets the cairo_font_options_t used for Pango rendering in this widget.
setHalign void setHalign(GtkAlign align_): Sets the horizontal alignment of @widget.
setHasTooltip void setHasTooltip(bool hasTooltip): Sets the has-tooltip property on @widget to @has_tooltip.
setHexpand void setHexpand(bool expand): Sets whether the widget would like any available extra horizontal space.
setHexpandSet void setHexpandSet(bool set): Sets whether the hexpand flag will be used.
setLayoutManager void setLayoutManager(LayoutManager layoutManager): Sets the layout manager delegate instance that provides an implementation for measuring and allocating the children of @widget.
setMarginBottom void setMarginBottom(int margin): Sets the bottom margin of @widget.
setMarginEnd void setMarginEnd(int margin): Sets the end margin of @widget.
setMarginStart void setMarginStart(int margin): Sets the start margin of @widget.
setMarginTop void setMarginTop(int margin): Sets the top margin of @widget.
setName void setName(string name): Sets a widgets name.
setOpacity void setOpacity(double opacity): Request the @widget to be rendered partially transparent.
setOverflow void setOverflow(GtkOverflow overflow): Sets how @widget treats content that is drawn outside the widget's content area.
setParent void setParent(Widget parent): Sets @parent as the parent widget of @widget.
setReceivesDefault void setReceivesDefault(bool receivesDefault): Specifies whether @widget will be treated as the default widget within its toplevel when it has the focus, even if another widget is the default.
setSensitive void setSensitive(bool sensitive): Sets the sensitivity of a widget.
setSizeRequest void setSizeRequest(int width, int height): Sets the minimum size of a widget.
setStateFlags void setStateFlags(GtkStateFlags flags, bool clear): Turns on flag values in the current widget state.
setTooltipMarkup void setTooltipMarkup(string markup): Sets @markup as the contents of the tooltip, which is marked up with Pango markup.
setTooltipText void setTooltipText(string text): Sets @text as the contents of the tooltip.
setValign void setValign(GtkAlign align_): Sets the vertical alignment of @widget.
setVexpand void setVexpand(bool expand): Sets whether the widget would like any available extra vertical space.
setVexpandSet void setVexpandSet(bool set): Sets whether the vexpand flag will be used.
setVisible void setVisible(bool visible): Sets the visibility state of @widget.
shouldLayout bool shouldLayout(): Returns whether @widget should contribute to the measuring and allocation of its parent.
show void show(): Flags a widget to be displayed.
sizeAllocate void sizeAllocate(GtkAllocation* allocation, int baseline): Allocates widget with a transformation that translates the origin to the position in @allocation.
snapshotChild void snapshotChild(Widget child, Snapshot snapshot): Snapshot the a child of @widget.
translateCoordinates bool translateCoordinates(Widget destWidget, double srcX, double srcY, double destX, double destY): Translate coordinates relative to @src_widget’s allocation to coordinates relative to @dest_widget’s allocations.
triggerTooltipQuery void triggerTooltipQuery(): Triggers a tooltip query on the display where the toplevel of @widget is located.
unmap void unmap(): Causes a widget to be unmapped if it’s currently mapped.
unparent void unparent(): Dissociate @widget from its parent.
unrealize void unrealize(): Causes a widget to be unrealized (frees all GDK resources associated with the widget).
unsetStateFlags void unsetStateFlags(GtkStateFlags flags): Turns off flag values for the current widget state.

Mixins

__anonymous mixin BuildableT!(GtkWidget): Undocumented in source.
__anonymous mixin ConstraintTargetT!(GtkWidget): Undocumented in source.
__anonymous mixin AccessibleT!(GtkWidget): Undocumented in source.

Static functions

getDefaultDirection GtkTextDirection getDefaultDirection(): Obtains the current default reading direction.
getType GType getType()
setDefaultDirection void setDefaultDirection(GtkTextDirection dir): Sets the default reading direction for widgets.

Variables

gtkWidget GtkWidget* gtkWidget;: the main Gtk struct

Inherited Members

From ObjectG

gObject GObject* gObject;: the main Gtk struct
ownedRef bool ownedRef;: Undocumented in source.
getObjectGStruct GObject* getObjectGStruct(bool transferOwnership): Get the main Gtk struct
getStruct void* getStruct(): the main Gtk struct as a void*
isGcRoot bool isGcRoot;: Undocumented in source.
signals DClosure[gulong] signals;: Undocumented in source.
destroyNotify void destroyNotify(ObjectG obj): Undocumented in source. Be warned that the author may not have intended to support it.
toggleNotify void toggleNotify(ObjectG obj, GObject* object, int isLastRef): Undocumented in source. Be warned that the author may not have intended to support it.
~this ~this(): Undocumented in source.
opCast T opCast()
getDObject RT getDObject(U obj, bool ownedRef): Gets a D Object from the objects table of associations.
removeGcRoot void removeGcRoot(): Undocumented in source. Be warned that the author may not have intended to support it.
setProperty void setProperty(string propertyName, T value)
unref deprecated void unref(ObjectG obj): Undocumented in source. Be warned that the author may not have intended to support it.
doref deprecated ObjectG doref(ObjectG obj): Undocumented in source. Be warned that the author may not have intended to support it.
addOnNotify gulong addOnNotify(void delegate(ParamSpec, ObjectG) dlg, string property, ConnectFlags connectFlags): The notify signal is emitted on an object when one of its properties has been changed. Note that getting this signal doesn't guarantee that the value of the property has actually changed, it may also be emitted when the setter for the property is called to reinstate the previous value.
getType GType getType()
compatControl size_t compatControl(size_t what, void* data)
interfaceFindProperty ParamSpec interfaceFindProperty(TypeInterface gIface, string propertyName): Find the #GParamSpec with the given name for an interface. Generally, the interface vtable passed in as @g_iface will be the default vtable from g_type_default_interface_ref(), or, if you know the interface has already been loaded, g_type_default_interface_peek().
interfaceInstallProperty void interfaceInstallProperty(TypeInterface gIface, ParamSpec pspec): Add a property to an interface; this is only useful for interfaces that are added to GObject-derived types. Adding a property to an interface forces all objects classes with that interface to have a compatible property. The compatible property could be a newly created #GParamSpec, but normally g_object_class_override_property() will be used so that the object class only needs to provide an implementation and inherits the property description, default value, bounds, and so forth from the interface property.
interfaceListProperties ParamSpec[] interfaceListProperties(TypeInterface gIface): Lists the properties of an interface.Generally, the interface vtable passed in as @g_iface will be the default vtable from g_type_default_interface_ref(), or, if you know the interface has already been loaded, g_type_default_interface_peek().
addToggleRef void addToggleRef(GToggleNotify notify, void* data): Increases the reference count of the object by one and sets a callback to be called when all other references to the object are dropped, or when this is already the last reference to the object and another reference is established.
addWeakPointer void addWeakPointer(void* weakPointerLocation): Adds a weak reference from weak_pointer to @object to indicate that the pointer located at @weak_pointer_location is only valid during the lifetime of @object. When the @object is finalized, @weak_pointer will be set to %NULL.
bindProperty Binding bindProperty(string sourceProperty, ObjectG target, string targetProperty, GBindingFlags flags): Creates a binding between @source_property on @source and @target_property on @target. Whenever the @source_property is changed the @target_property is updated using the same value. For instance:
bindPropertyFull Binding bindPropertyFull(string sourceProperty, ObjectG target, string targetProperty, GBindingFlags flags, GBindingTransformFunc transformTo, GBindingTransformFunc transformFrom, void* userData, GDestroyNotify notify): Complete version of g_object_bind_property().
bindPropertyWithClosures Binding bindPropertyWithClosures(string sourceProperty, ObjectG target, string targetProperty, GBindingFlags flags, Closure transformTo, Closure transformFrom): Creates a binding between @source_property on @source and @target_property on @target, allowing you to set the transformation functions to be used by the binding.
dupData void* dupData(string key, GDuplicateFunc dupFunc, void* userData): This is a variant of g_object_get_data() which returns a 'duplicate' of the value. @dup_func defines the meaning of 'duplicate' in this context, it could e.g. take a reference on a ref-counted object.
dupQdata void* dupQdata(GQuark quark, GDuplicateFunc dupFunc, void* userData): This is a variant of g_object_get_qdata() which returns a 'duplicate' of the value. @dup_func defines the meaning of 'duplicate' in this context, it could e.g. take a reference on a ref-counted object.
forceFloating void forceFloating(): This function is intended for #GObject implementations to re-enforce a floating[floating-ref] object reference. Doing this is seldom required: all #GInitiallyUnowneds are created with a floating reference which usually just needs to be sunken by calling g_object_ref_sink().
freezeNotify void freezeNotify(): Increases the freeze count on @object. If the freeze count is non-zero, the emission of "notify" signals on @object is stopped. The signals are queued until the freeze count is decreased to zero. Duplicate notifications are squashed so that at most one #GObject::notify signal is emitted for each property modified while the object is frozen.
getData void* getData(string key): Gets a named field from the objects table of associations (see g_object_set_data()).
getProperty void getProperty(string propertyName, Value value): Gets a property of an object.
getQdata void* getQdata(GQuark quark): This function gets back user data pointers stored via g_object_set_qdata().
getValist void getValist(string firstPropertyName, void* varArgs): Gets properties of an object.
getv void getv(string[] names, Value[] values): Gets @n_properties properties for an @object. Obtained properties will be set to @values. All properties must be valid. Warnings will be emitted and undefined behaviour may result if invalid properties are passed in.
isFloating bool isFloating(): Checks whether @object has a floating[floating-ref] reference.
notify void notify(string propertyName): Emits a "notify" signal for the property @property_name on @object.
notifyByPspec void notifyByPspec(ParamSpec pspec): Emits a "notify" signal for the property specified by @pspec on @object.
doref alias doref = ref_: Undocumented in source.
ref_ ObjectG ref_(): Increases the reference count of @object.
refSink ObjectG refSink(): Increase the reference count of @object, and possibly remove the floating[floating-ref] reference, if @object has a floating reference.
removeToggleRef void removeToggleRef(GToggleNotify notify, void* data): Removes a reference added with g_object_add_toggle_ref(). The reference count of the object is decreased by one.
removeWeakPointer void removeWeakPointer(void* weakPointerLocation): Removes a weak reference from @object that was previously added using g_object_add_weak_pointer(). The @weak_pointer_location has to match the one used with g_object_add_weak_pointer().
replaceData bool replaceData(string key, void* oldval, void* newval, GDestroyNotify destroy, GDestroyNotify oldDestroy): Compares the user data for the key @key on @object with @oldval, and if they are the same, replaces @oldval with @newval.
replaceQdata bool replaceQdata(GQuark quark, void* oldval, void* newval, GDestroyNotify destroy, GDestroyNotify oldDestroy): Compares the user data for the key @quark on @object with @oldval, and if they are the same, replaces @oldval with @newval.
runDispose void runDispose(): Releases all references to other objects. This can be used to break reference cycles.
setData void setData(string key, void* data): Each object carries around a table of associations from strings to pointers. This function lets you set an association.
setDataFull void setDataFull(string key, void* data, GDestroyNotify destroy): Like g_object_set_data() except it adds notification for when the association is destroyed, either by setting it to a different value or when the object is destroyed.
setProperty void setProperty(string propertyName, Value value): Sets a property on an object.
setQdata void setQdata(GQuark quark, void* data): This sets an opaque, named pointer on an object. The name is specified through a #GQuark (retrieved e.g. via g_quark_from_static_string()), and the pointer can be gotten back from the @object with g_object_get_qdata() until the @object is finalized. Setting a previously set user data pointer, overrides (frees) the old pointer set, using #NULL as pointer essentially removes the data stored.
setQdataFull void setQdataFull(GQuark quark, void* data, GDestroyNotify destroy): This function works like g_object_set_qdata(), but in addition, a void (*destroy) (gpointer) function may be specified which is called with @data as argument when the @object is finalized, or the data is being overwritten by a call to g_object_set_qdata() with the same @quark.
setValist void setValist(string firstPropertyName, void* varArgs): Sets properties on an object.
setv void setv(string[] names, Value[] values): Sets @n_properties properties for an @object. Properties to be set will be taken from @values. All properties must be valid. Warnings will be emitted and undefined behaviour may result if invalid properties are passed in.
stealData void* stealData(string key): Remove a specified datum from the object's data associations, without invoking the association's destroy handler.
stealQdata void* stealQdata(GQuark quark): This function gets back user data pointers stored via g_object_set_qdata() and removes the @data from object without invoking its destroy() function (if any was set). Usually, calling this function is only required to update user data pointers with a destroy notifier, for example: |[ void object_add_to_user_list (GObject *object, const gchar *new_string) { // the quark, naming the object data GQuark quark_string_list = g_quark_from_static_string ("my-string-list"); // retrieve the old string list GList *list = g_object_steal_qdata (object, quark_string_list);
thawNotify void thawNotify(): Reverts the effect of a previous call to g_object_freeze_notify(). The freeze count is decreased on @object and when it reaches zero, queued "notify" signals are emitted.
unref void unref(): Decreases the reference count of @object. When its reference count drops to 0, the object is finalized (i.e. its memory is freed).
watchClosure void watchClosure(Closure closure): This function essentially limits the life time of the @closure to the life time of the object. That is, when the object is finalized, the @closure is invalidated by calling g_closure_invalidate() on it, in order to prevent invocations of the closure with a finalized (nonexisting) object. Also, g_object_ref() and g_object_unref() are added as marshal guards to the @closure, to ensure that an extra reference count is held on @object during invocation of the @closure. Usually, this function will be called on closures that use this @object as closure data.
weakRef void weakRef(GWeakNotify notify, void* data): Adds a weak reference callback to an object. Weak references are used for notification when an object is disposed. They are called "weak references" because they allow you to safely hold a pointer to an object without calling g_object_ref() (g_object_ref() adds a strong reference, that is, forces the object to stay alive).
weakUnref void weakUnref(GWeakNotify notify, void* data): Removes a weak reference callback to an object.
clearObject void clearObject(ObjectG objectPtr): Clears a reference to a #GObject.

From AccessibleIF

getAccessibleStruct GtkAccessible* getAccessibleStruct(bool transferOwnership): Get the main Gtk struct
getStruct void* getStruct(): the main Gtk struct as a void*
getType GType getType()
getAccessibleRole GtkAccessibleRole getAccessibleRole(): Retrieves the GtkAccessibleRole for the given GtkAccessible.
resetProperty void resetProperty(GtkAccessibleProperty property): Resets the accessible @property to its default value.
resetRelation void resetRelation(GtkAccessibleRelation relation): Resets the accessible @relation to its default value.
resetState void resetState(GtkAccessibleState state): Resets the accessible @state to its default value.
updatePropertyValue void updatePropertyValue(GtkAccessibleProperty[] properties, Value[] values): Updates an array of accessible properties.
updateRelationValue void updateRelationValue(GtkAccessibleRelation[] relations, Value[] values): Updates an array of accessible relations.
updateStateValue void updateStateValue(GtkAccessibleState[] states, Value[] values): Updates an array of accessible states.

From BuildableIF

getBuildableStruct GtkBuildable* getBuildableStruct(bool transferOwnership): Get the main Gtk struct
getStruct void* getStruct(): the main Gtk struct as a void*
getType GType getType()
getBuildableId string getBuildableId(): Gets the ID of the @buildable object.

From ConstraintTargetIF

getConstraintTargetStruct GtkConstraintTarget* getConstraintTargetStruct(bool transferOwnership): Get the main Gtk struct
getStruct void* getStruct(): the main Gtk struct as a void*
getType GType getType()