Class Drag

java.lang.Object

org.javagi.base.ProxyInstance

org.gnome.gobject.TypeInstance

org.gnome.gobject.GObject

org.gnome.gdk.Drag

All Implemented Interfaces:

Proxy

Direct Known Subclasses:

Drag.Drag$Impl

@Generated("org.javagi.JavaGI")
public abstract class Drag
extends GObject

Represents the source of an ongoing DND operation.

A GdkDrag is created when a drag is started, and stays alive for duration of the DND operation. After a drag has been started with begin(Surface, Device, ContentProvider, Set, double, double), the caller gets informed about the status of the ongoing drag operation with signals on the GdkDrag object.

GTK provides a higher level abstraction based on top of these functions, and so they are not normally needed in GTK applications. See the "Drag and Drop" section of the GTK documentation for more information.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Drag.Builder<B extends Drag.Builder<B>>	Inner class implementing a builder pattern to construct a GObject with properties.
static interface	Drag.CancelCallback	Functional interface declaration of the CancelCallback callback.
static interface	Drag.DndFinishedCallback	Functional interface declaration of the DndFinishedCallback callback.
static class	Drag.Drag$Impl	The Drag$Impl type represents a native instance of the abstract Drag class.
static interface	Drag.DropPerformedCallback	Functional interface declaration of the DropPerformedCallback callback.

Nested classes/interfaces inherited from class GObject

GObject.NotifyCallback, GObject.ObjectClass

Constructor Summary

Constructors

Constructor	Description
Drag()	Create a new Drag.
Drag(MemorySegment address)	Create a Drag instance for the provided memory address.

Method Summary

Modifier and Type	Method	Description
protected Drag	asParent()	Return this instance as if it were its parent type.
static @Nullable Drag	begin(Surface surface, Device device, ContentProvider content, Set<DragAction> actions, double dx, double dy)	Starts a drag and creates a new drag context for it.
static @Nullable Drag	begin(Surface surface, Device device, ContentProvider content, DragAction actions, double dx, double dy)	Starts a drag and creates a new drag context for it.
void	dropDone(boolean success)	Informs GDK that the drop ended.
void	emitCancel(DragCancelReason reason)	Emits the "cancel" signal.
void	emitDndFinished()	Emits the "dnd-finished" signal.
void	emitDropPerformed()	Emits the "drop-performed" signal.
Set<DragAction>	getActions()	Determines the bitmask of possible actions proposed by the source.
ContentProvider	getContent()	Returns the GdkContentProvider associated to the GdkDrag object.
Device	getDevice()	Returns the GdkDevice associated to the GdkDrag object.
Display	getDisplay()	Gets the GdkDisplay that the drag object was created for.
@Nullable Surface	getDragSurface()	Returns the surface on which the drag icon should be rendered during the drag operation.
ContentFormats	getFormats()	Retrieves the formats supported by this GdkDrag object.
static MemoryLayout	getMemoryLayout()	The memory layout of the native struct.
Set<DragAction>	getSelectedAction()	Determines the action chosen by the drag destination.
Surface	getSurface()	Returns the GdkSurface where the drag originates.
static @Nullable Type	getType()	Get the GType of the Drag class.
SignalConnection<Drag.CancelCallback>	onCancel(Drag.CancelCallback handler)	Emitted when the drag operation is cancelled.
SignalConnection<Drag.DndFinishedCallback>	onDndFinished(Drag.DndFinishedCallback handler)	Emitted when the destination side has finished reading all data.
SignalConnection<Drag.DropPerformedCallback>	onDropPerformed(Drag.DropPerformedCallback handler)	Emitted when the drop operation is performed on an accepting client.
void	setHotspot(int hotX, int hotY)	Sets the position of the drag surface that will be kept under the cursor hotspot.

Methods inherited from class GObject

addToggleRef, addWeakPointer, bindProperty, bindProperty, bindProperty, bindPropertyFull, bindPropertyFull, bindPropertyWithClosures, bindPropertyWithClosures, builder, 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

Constructor Details

Drag

public Drag(MemorySegment address)

Create a Drag instance for the provided memory address.

Parameters:

address - the memory address of the native object

Drag

public Drag()

Create a new Drag.

Method Details

getType

public static @Nullable Type getType()

Get the GType of the Drag class.

Returns:

the GType

getMemoryLayout

public static MemoryLayout getMemoryLayout()

The memory layout of the native struct.

Returns:

the memory layout

asParent

protected Drag 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

begin

public static @Nullable Drag begin(Surface surface,
 Device device,
 ContentProvider content,
 Set<DragAction> actions,
 double dx,
 double dy)

Starts a drag and creates a new drag context for it.

This function is called by the drag source. After this call, you probably want to set up the drag icon using the surface returned by getDragSurface().

This function returns a reference to the Drag object, but GTK keeps its own reference as well, as long as the DND operation is going on.

Note: if actions include DragAction.MOVE, you need to listen for the Gdk.Drag::dnd-finished signal and delete the data at the source if getSelectedAction() returns DragAction.MOVE.

Parameters:

surface - the source surface for this drag

device - the device that controls this drag

content - the offered content

actions - the actions supported by this drag

dx - the x offset to device's position where the drag nominally started

dy - the y offset to device's position where the drag nominally started

Returns:

a newly created GdkDrag

begin

public static @Nullable Drag begin(Surface surface,
 Device device,
 ContentProvider content,
 DragAction actions,
 double dx,
 double dy)

Starts a drag and creates a new drag context for it.

This function is called by the drag source. After this call, you probably want to set up the drag icon using the surface returned by getDragSurface().

This function returns a reference to the Drag object, but GTK keeps its own reference as well, as long as the DND operation is going on.

Note: if actions include DragAction.MOVE, you need to listen for the Gdk.Drag::dnd-finished signal and delete the data at the source if getSelectedAction() returns DragAction.MOVE.

Parameters:

surface - the source surface for this drag

device - the device that controls this drag

content - the offered content

actions - the actions supported by this drag

dx - the x offset to device's position where the drag nominally started

dy - the y offset to device's position where the drag nominally started

Returns:

a newly created GdkDrag

dropDone

public void dropDone(boolean success)

Informs GDK that the drop ended.

Passing false for success may trigger a drag cancellation animation.

This function is called by the drag source, and should be the last call before dropping the reference to the drag.

The GdkDrag will only take the first dropDone(boolean) call as effective, if this function is called multiple times, all subsequent calls will be ignored.

Parameters:

success - whether the drag was ultimatively successful

getActions

public Set<DragAction> getActions()

Determines the bitmask of possible actions proposed by the source.

Returns:

the GdkDragAction flags

getContent

public ContentProvider getContent()

Returns the GdkContentProvider associated to the GdkDrag object.

Returns:

The GdkContentProvider associated to drag.

getDevice

public Device getDevice()

Returns the GdkDevice associated to the GdkDrag object.

Returns:

The GdkDevice associated to drag.

getDisplay

public Display getDisplay()

Gets the GdkDisplay that the drag object was created for.

Returns:

a GdkDisplay

getDragSurface

public @Nullable Surface getDragSurface()

Returns the surface on which the drag icon should be rendered during the drag operation.

Note that the surface may not be available until the drag operation has begun. GDK will move the surface in accordance with the ongoing drag operation. The surface is owned by this Drag and will be destroyed when the drag operation is over.

Returns:

the drag surface

getFormats

public ContentFormats getFormats()

Retrieves the formats supported by this GdkDrag object.

Returns:

a GdkContentFormats

getSelectedAction

public Set<DragAction> getSelectedAction()

Determines the action chosen by the drag destination.

Returns:

a GdkDragAction value

getSurface

public Surface getSurface()

Returns the GdkSurface where the drag originates.

Returns:

The GdkSurface where the drag originates

setHotspot

public void setHotspot(int hotX,
 int hotY)

Sets the position of the drag surface that will be kept under the cursor hotspot.

Initially, the hotspot is at the top left corner of the drag surface.

Parameters:

hotX - x coordinate of the drag surface hotspot

hotY - y coordinate of the drag surface hotspot

onCancel

public SignalConnection<Drag.CancelCallback> onCancel(Drag.CancelCallback handler)

Emitted when the drag operation is cancelled.

Parameters:

handler - the signal handler

Returns:

a signal handler ID to keep track of the signal connection

See Also:

• Drag.CancelCallback.run(DragCancelReason)

emitCancel

public void emitCancel(DragCancelReason reason)

Emits the "cancel" signal. See onCancel(Drag.CancelCallback).

onDndFinished

public SignalConnection<Drag.DndFinishedCallback> onDndFinished(Drag.DndFinishedCallback handler)

Emitted when the destination side has finished reading all data.

The drag object can now free all miscellaneous data.

Parameters:

handler - the signal handler

Returns:

a signal handler ID to keep track of the signal connection

See Also:

• Drag.DndFinishedCallback.run()

emitDndFinished

public void emitDndFinished()

Emits the "dnd-finished" signal. See onDndFinished(Drag.DndFinishedCallback).

onDropPerformed

public SignalConnection<Drag.DropPerformedCallback> onDropPerformed(Drag.DropPerformedCallback handler)

Emitted when the drop operation is performed on an accepting client.

Parameters:

handler - the signal handler

Returns:

a signal handler ID to keep track of the signal connection

See Also:

• Drag.DropPerformedCallback.run()

emitDropPerformed

public void emitDropPerformed()

Emits the "drop-performed" signal. See onDropPerformed(Drag.DropPerformedCallback).