Interface DragSource.PrepareCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

DragSource

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public static interface DragSource.PrepareCallback
extends FunctionPointer

Functional interface declaration of the PrepareCallback callback.

See Also:

• run(double, double)

Method Summary

Modifier and Type	Method	Description
ContentProvider	run(double x, double y)	Emitted when a drag is about to be initiated.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(MemorySegment, double, double) method.
default MemorySegment	upcall(MemorySegment sourceDragSource, double x, double y)	The upcall method is called from native code.

Method Details

run

ContentProvider run(double x,
 double y)

Emitted when a drag is about to be initiated.

It returns the GdkContentProvider to use for the drag that is about to start. The default handler for this signal returns the value of the Gtk.DragSource:content property, so if you set up that property ahead of time, you don't need to connect to this signal.

upcall

default MemorySegment upcall(MemorySegment sourceDragSource,
 double x,
 double y)

The upcall method is called from native code. The parameters are marshaled and run(double, double) is executed.

toCallback

default MemorySegment toCallback(Arena arena)

Creates a native function pointer to the upcall(MemorySegment, double, double) method.

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the arena in which the function pointer is allocated

Returns:

the native function pointer