org.artoflife.util.dnd
Class ThumbnailIconDropTargetListener

java.lang.Object
  |
  +--org.artoflife.util.dnd.ThumbnailIconDropTargetListener

All Implemented Interfaces:

java.awt.dnd.DropTargetListener, java.util.EventListener

Direct Known Subclasses:

PopulationViewDropTargetListener

public abstract class ThumbnailIconDropTargetListener

extends java.lang.Object

implements java.awt.dnd.DropTargetListener

Abstract base DropTargetListener can draw a ThumbnailIcon while dragging using a ThumbnailTransferable.

Author:

Steve Meyfroidt

Field Summary

protected java.awt.Rectangle	lastDragImageBounds Used to erase the last image.
protected java.awt.Point	lastMousePosition Used to avoid doing anything if the mouse didn't move.
protected ThumbnailIcon	thumbnailIcon Cache this in dragEnter, unset in dragExit and drop.

Constructor Summary

ThumbnailIconDropTargetListener()

Method Summary

void	dragEnter(java.awt.dnd.DropTargetDragEvent dtde) Initialise everything here so can paint icon while tracking in dragOver.
void	dragExit(java.awt.dnd.DropTargetEvent dte) Must call this from subclass dragExit() implementation.
void	dragOver(java.awt.dnd.DropTargetDragEvent dtde) If got a thumbnail icon to paint then track cursor with it.
void	drop(java.awt.dnd.DropTargetDropEvent dtde) Must call this from subclass drop() implementation.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.awt.dnd.DropTargetListener

dropActionChanged

Field Detail

lastMousePosition

protected java.awt.Point lastMousePosition

Used to avoid doing anything if the mouse didn't move.

lastDragImageBounds

protected java.awt.Rectangle lastDragImageBounds

Used to erase the last image.

thumbnailIcon

protected ThumbnailIcon thumbnailIcon

Cache this in dragEnter, unset in dragExit and drop.

Constructor Detail

ThumbnailIconDropTargetListener

public ThumbnailIconDropTargetListener()

Method Detail

dragEnter

public void dragEnter(java.awt.dnd.DropTargetDragEvent dtde)

Initialise everything here so can paint icon while tracking in dragOver.

Must call this from subclasses after accepting the drag else you will see "No current drop operation" exceptions from the underlying AWT DnD implementation.

Specified by:

dragEnter in interface java.awt.dnd.DropTargetListener

See Also:

DropTargetListener.dragEnter(DropTargetDragEvent)

dragOver

public void dragOver(java.awt.dnd.DropTargetDragEvent dtde)

If got a thumbnail icon to paint then track cursor with it.

Must call this from subclass dragOver implementations.

Specified by:

dragOver in interface java.awt.dnd.DropTargetListener

See Also:

DropTargetListener.dragOver(java.awt.dnd.DropTargetDragEvent)

dragExit

public void dragExit(java.awt.dnd.DropTargetEvent dte)

Must call this from subclass dragExit() implementation.

Specified by:

dragExit in interface java.awt.dnd.DropTargetListener

See Also:

DropTargetListener.dragExit(java.awt.dnd.DropTargetEvent)

drop

public void drop(java.awt.dnd.DropTargetDropEvent dtde)

Must call this from subclass drop() implementation.

Specified by:

drop in interface java.awt.dnd.DropTargetListener

See Also:

DropTargetListener.drop(java.awt.dnd.DropTargetDropEvent)