Class PropertyAction

java.lang.Object

org.javagi.base.ProxyInstance

org.gnome.gobject.TypeInstance

org.gnome.gobject.GObject

org.gnome.gio.PropertyAction

All Implemented Interfaces:

Action, Proxy

@Generated("org.javagi.JavaGI")
public class PropertyAction
extends GObject
implements Action

A GPropertyAction is a way to get a Action with a state value reflecting and controlling the value of a GObject property.

The state of the action will correspond to the value of the property. Changing it will change the property (assuming the requested value matches the requirements as specified in the GObject.ParamSpec).

Only the most common types are presently supported. Booleans are mapped to booleans, strings to strings, signed/unsigned integers to int32/uint32 and floats and doubles to doubles.

If the property is an enum then the state will be string-typed and conversion will automatically be performed between the enum value and ‘nick’ string as per the GObject.EnumValue table.

Flags types are not currently supported.

Properties of object types, boxed types and pointer types are not supported and probably never will be.

Properties of GLib.Variant types are not currently supported.

If the property is boolean-valued then the action will have a NULL parameter type, and activating the action (with no parameter) will toggle the value of the property.

In all other cases, the parameter type will correspond to the type of the property.

The general idea here is to reduce the number of locations where a particular piece of state is kept (and therefore has to be synchronised between). GPropertyAction does not have a separate state that is kept in sync with the property value — its state is the property value.

For example, it might be useful to create a Action corresponding to the visible-child-name property of a GtkStack so that the current page can be switched from a menu. The active radio indication in the menu is then directly determined from the active page of the GtkStack.

An anti-example would be binding the active-id property on a GtkComboBox. This is because the state of the combo box itself is probably uninteresting and is actually being used to control something else.

Another anti-example would be to bind to the visible-child-name property of a GtkStack if this value is actually stored in Settings. In that case, the real source of the value is* Settings. If you want a Action to control a setting stored in Settings, see Settings.createAction(String) instead, and possibly combine its use with Settings.bind(String, GObject, String, Set).

Since:

2.38

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	PropertyAction.Builder<B extends PropertyAction.Builder<B>>	Inner class implementing a builder pattern to construct a GObject with properties.

Nested classes/interfaces inherited from class GObject

GObject.NotifyCallback, GObject.ObjectClass

Nested classes/interfaces inherited from interface Action

Action.Action$Impl, Action.ActionInterface

Constructor Summary

Constructors

Constructor	Description
PropertyAction()	Create a new PropertyAction.
PropertyAction(MemorySegment address)	Create a PropertyAction instance for the provided memory address.
PropertyAction(String name, GObject object, String propertyName)	Creates a GAction corresponding to the value of property propertyName on object.

Method Summary

Modifier and Type	Method	Description
protected PropertyAction	asParent()	Return this instance as if it were its parent type.
static PropertyAction.Builder<? extends PropertyAction.Builder>	builder()	A PropertyAction.Builder object constructs a PropertyAction with the specified properties.
static MemoryLayout	getMemoryLayout()	The memory layout of the native struct.
static @Nullable Type	getType()	Get the GType of the PropertyAction class.

Methods inherited from class GObject

addToggleRef, addWeakPointer, bindProperty, bindProperty, bindProperty, bindPropertyFull, bindPropertyFull, bindPropertyWithClosures, bindPropertyWithClosures, compatControl, connect, connect, connect, constructed, disconnect, dispatchPropertiesChanged, dispose, dupData, dupQdata, emit, emitNotify, finalize_, forceFloating, freezeNotify, get, getData, getProperty, getProperty, getProperty, getQdata, getv, interfaceFindProperty, interfaceInstallProperty, interfaceListProperties, isFloating, newInstance, newInstance, newv, notify, notify, notifyByPspec, onNotify, ref, refSink, removeToggleRef, removeWeakPointer, replaceData, replaceQdata, runDispose, set, setData, setDataFull, setProperty, setProperty, setProperty, setQdata, setQdataFull, setv, stealData, stealQdata, takeRef, thawNotify, unref, watchClosure, weakRef, weakUnref, withProperties

Methods inherited from class TypeInstance

callParent, callParent, cast, getPrivate, readGClass, writeGClass

Methods inherited from class ProxyInstance

equals, handle, hashCode

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface Action

activate, changeState, getEnabled, getName, getParameterType, getState, getStateHint, getStateType

Methods inherited from interface Proxy

handle

Constructor Details

PropertyAction

public PropertyAction(MemorySegment address)

Create a PropertyAction instance for the provided memory address.

Parameters:

address - the memory address of the native object

PropertyAction

public PropertyAction(String name,
 GObject object,
 String propertyName)

Creates a GAction corresponding to the value of property propertyName on object.

The property must be existent and readable and writable (and not construct-only).

This function takes a reference on object and doesn't release it until the action is destroyed.

Parameters:

name - the name of the action to create

object - the object that has the property to wrap

propertyName - the name of the property

Since:

2.38

PropertyAction

public PropertyAction()

Create a new PropertyAction.

Method Details

getType

public static @Nullable Type getType()

Get the GType of the PropertyAction class.

Returns:

the GType

getMemoryLayout

public static MemoryLayout getMemoryLayout()

The memory layout of the native struct.

Returns:

the memory layout

asParent

protected PropertyAction asParent()

Return this instance as if it were its parent type. Comparable to the Java super keyword, but ensures the parent typeclass is also used in native code.

Overrides:

asParent in class GObject

Returns:

the instance as if it were its parent type

builder

public static PropertyAction.Builder<? extends PropertyAction.Builder> builder()

A PropertyAction.Builder object constructs a PropertyAction with the specified properties. Use the various set...() methods to set properties, and finish construction with PropertyAction.Builder.build().

Returns:

the builder object