com.allen_sauer.gwt.dnd.client.drop
Class AbsolutePositionDropController

java.lang.Object
  com.allen_sauer.gwt.dnd.client.drop.AbstractDropController
      com.allen_sauer.gwt.dnd.client.drop.AbstractPositioningDropController
          com.allen_sauer.gwt.dnd.client.drop.AbsolutePositionDropController

All Implemented Interfaces:

DropController

Direct Known Subclasses:

BoundaryDropController, GridConstrainedDropController, SwtAbsoluteDropController

public class AbsolutePositionDropController
extends AbstractPositioningDropController

A DropController which allows a draggable widget to be placed at specific (absolute) locations on an AbsolutePanel drop target.

Field Summary

protected int	dropTargetClientHeight
protected int	dropTargetClientWidth
protected int	dropTargetOffsetX
protected int	dropTargetOffsetY

Constructor Summary

AbsolutePositionDropController(com.google.gwt.user.client.ui.AbsolutePanel dropTarget)
Basic constructor.

Method Summary

void	drop(com.google.gwt.user.client.ui.Widget widget, int left, int top) Programmatically drop a widget on our drop target while obeying the constraints of this controller.
protected java.util.List<Draggable>	getDraggableList()
void	onDrop(DragContext context) Called when the draggable widget or its proxy is dropped on our drop target.
void	onEnter(DragContext context) Called when the draggable widget or its proxy engages our drop target.
void	onLeave(DragContext context) Called when the reference widget stops engaging our drop target by leaving the area of the page occupied by our drop target, or after DropController.onDrop(DragContext) to allow for any cleanup.
void	onMove(DragContext context) Called with each mouse movement while the reference widget is engaging our drop target.

Methods inherited from class com.allen_sauer.gwt.dnd.client.drop.AbstractDropController

getDropTarget, onPreviewDrop

Methods inherited from class java.lang.Object

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

Field Detail

dropTargetClientHeight

protected int dropTargetClientHeight

dropTargetClientWidth

protected int dropTargetClientWidth

dropTargetOffsetX

protected int dropTargetOffsetX

dropTargetOffsetY

protected int dropTargetOffsetY

Constructor Detail

AbsolutePositionDropController

public AbsolutePositionDropController(com.google.gwt.user.client.ui.AbsolutePanel dropTarget)

Basic constructor.

Parameters:

dropTarget - the absolute panel drop target

Method Detail

getDraggableList

protected java.util.List<Draggable> getDraggableList()

drop

public void drop(com.google.gwt.user.client.ui.Widget widget,
                 int left,
                 int top)

Programmatically drop a widget on our drop target while obeying the constraints of this controller.

Parameters:

widget - the widget to be dropped

left - the desired absolute horizontal location relative to our drop target

top - the desired absolute vertical location relative to our drop target

onDrop

public void onDrop(DragContext context)

Description copied from interface: DropController

Called when the draggable widget or its proxy is dropped on our drop target. Implementing classes must attach the draggable widget to our drop target in a suitable manner.

Specified by:

onDrop in interface DropController

Overrides:

onDrop in class AbstractDropController

Parameters:

context - the current drag context

See Also:

DropController.onPreviewDrop(DragContext)

onEnter

public void onEnter(DragContext context)

Description copied from interface: DropController

Called when the draggable widget or its proxy engages our drop target. This occurs when the widget area and the drop target area intersect and there are no drop targets which are descendants of our drop target which also intersect with the widget. If there are, the widget engages with the descendant drop target instead.

Specified by:

onEnter in interface DropController

Overrides:

onEnter in class AbstractDropController

Parameters:

context - the current drag context

See Also:

DropController.onLeave(DragContext)

onLeave

public void onLeave(DragContext context)

Description copied from interface: DropController

Called when the reference widget stops engaging our drop target by leaving the area of the page occupied by our drop target, or after DropController.onDrop(DragContext) to allow for any cleanup.

Specified by:

onLeave in interface DropController

Overrides:

onLeave in class AbstractDropController

Parameters:

context - the current drag context

See Also:

DropController.onEnter(DragContext)

onMove

public void onMove(DragContext context)

Description copied from interface: DropController

Called with each mouse movement while the reference widget is engaging our drop target. DropController.onEnter(DragContext) is called before this method is called.

Specified by:

onMove in interface DropController

Overrides:

onMove in class AbstractDropController

Parameters:

context - the current drag context

See Also:

DropController.onEnter(DragContext), DropController.onLeave(DragContext)