Eclipse Plug-in Developer Guide (Galileo) - DropTargetEffect (Eclipse Platform API Specification)

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Eclipse Platform
Release 3.5

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org.eclipse.swt.dnd
Class DropTargetEffect


java.lang.Object
  

org.eclipse.swt.dnd.DropTargetAdapter
      
org.eclipse.swt.dnd.DropTargetEffect

All Implemented Interfaces:: EventListener, DropTargetListener, org.eclipse.swt.internal.SWTEventListener

Direct Known Subclasses:: StyledTextDropTargetEffect, TableDropTargetEffect, TreeDropTargetEffect

public class DropTargetEffect
extends DropTargetAdapter
extends DropTargetAdapter

This class provides a default drag under effect during a drag and drop. The current implementation does not provide any visual feedback.

The drop target effect has the same API as the DropTargetAdapter so that it can provide custom visual feedback when a DropTargetEvent occurs.

Classes that wish to provide their own drag under effect can extend the DropTargetEffect and override any applicable methods in DropTargetAdapter to display their own drag under effect.

The feedback value is either one of the FEEDBACK constants defined in class DND which is applicable to instances of this class, or it must be built by bitwise OR'ing together (that is, using the int "|" operator) two or more of those DND effect constants.

Feedback:: FEEDBACK_EXPAND, FEEDBACK_INSERT_AFTER, FEEDBACK_INSERT_BEFORE, FEEDBACK_NONE, FEEDBACK_SELECT, FEEDBACK_SCROLL

Since:: 3.3
See Also:: DropTargetAdapter, DropTargetEvent, Sample code and further information

Constructor Summary

DropTargetEffect ( Control control)
          Creates a new DropTargetEffect to handle the drag under effect on the specified Control.

Method Summary

Control getControl ()
          Returns the Control which is registered for this DropTargetEffect.

Widget getItem (int x, int y)
          Returns the item at the given x-y coordinate in the receiver or null if no such item exists.

Methods inherited from class org.eclipse.swt.dnd. DropTargetAdapter

dragEnter, dragLeave, dragOperationChanged, dragOver, drop, dropAccept

Methods inherited from class java.lang. Object

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

Constructor Detail

DropTargetEffect

public DropTargetEffect(
Control control)

Creates a new DropTargetEffect to handle the drag under effect on the specified Control.

Parameters:

control - the Control over which the user positions the cursor to drop the data

Throws:



IllegalArgumentException

ERROR_NULL_ARGUMENT - if the control is null

Method Detail

getControl

public 
Control getControl()

Returns the Control which is registered for this DropTargetEffect. This is the control over which the user positions the cursor to drop the data.

Returns:: the Control which is registered for this DropTargetEffect

getItem

public 
Widget getItem(int x,
                      int y)

Returns the item at the given x-y coordinate in the receiver or null if no such item exists. The x-y coordinate is in the display relative coordinates.

Parameters:: x - the x coordinate used to locate the item; y - the y coordinate used to locate the item
Returns:: the item at the given x-y coordinate, or null if the coordinate is not in a selectable item