Package gov.nasa.worldwind.util

Class BasicDragger

java.lang.Object

gov.nasa.worldwind.util.BasicDragger

All Implemented Interfaces:

SelectListener, java.util.EventListener

public class BasicDragger
extends java.lang.Object
implements SelectListener

Interprets mouse input via the DragSelectEvent for notifying picked objects implementing the Draggable interface. This version uses the Draggable interface for dragging but retains the original behavior of the BasicDragger when the PickedObject implements either the Movable or Movable2 interface.

For objects not yet implementing the Draggable interface the legacy dragging functionality will be used.

Field Summary

Fields

Modifier and Type	Field	Description
protected DragContext	dragContext	The DragContext for dragging operations.
protected boolean	dragging	Indicates if the dragger is currently dragging.
protected double	dragRefAltitude
protected java.awt.Point	dragRefCursorPoint
protected Vec4	dragRefObjectPoint
protected WorldWindow	wwd	The WorldWindow this dragger will utilize for the Globe, View, and SceneController objects.

Constructor Summary

Constructors

Constructor	Description
BasicDragger(WorldWindow wwd)	Creates a dragging controller which converts SelectEvents to the Draggable interface.

Method Summary

Modifier and Type	Method	Description
protected void	dragLegacy(SelectEvent event)	Legacy drag approach, provided for objects not yet implementing the Draggable interface.
protected void	fireDrag(DragSelectEvent dragEvent)	Propagates the DragContext to the picked object if it implements Draggable, Movable, or Movable2.
boolean	isDragging()	Returns if the dragger is currently executing a dragging operation.
void	selected(SelectEvent event)

Methods inherited from class java.lang.Object

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

Field Detail

wwd

protected WorldWindow wwd

The WorldWindow this dragger will utilize for the Globe, View, and SceneController objects.

dragging

protected boolean dragging

Indicates if the dragger is currently dragging.

dragContext

protected DragContext dragContext

The DragContext for dragging operations. Initialized on AVKey.DRAG_BEGIN.

dragRefObjectPoint

protected Vec4 dragRefObjectPoint

dragRefCursorPoint

protected java.awt.Point dragRefCursorPoint

dragRefAltitude

protected double dragRefAltitude

Constructor Detail

BasicDragger

public BasicDragger(WorldWindow wwd)

Creates a dragging controller which converts SelectEvents to the Draggable interface.

Parameters:

wwd - the WorldWindow this drag controller should be associated with.

Throws:

java.lang.IllegalArgumentException - if the provided WorldWindow is null.

Method Detail

isDragging

public boolean isDragging()

Returns if the dragger is currently executing a dragging operation.

Returns:

true if a drag operation is executing.

selected

public void selected(SelectEvent event)

Specified by:

selected in interface SelectListener

fireDrag

protected void fireDrag(DragSelectEvent dragEvent)

Propagates the DragContext to the picked object if it implements Draggable, Movable, or Movable2.

Parameters:

dragEvent - the DragContext to deliver to the selected object.

Throws:

java.lang.IllegalArgumentException - if the DragContext is null.

dragLegacy

protected void dragLegacy(SelectEvent event)

Legacy drag approach, provided for objects not yet implementing the Draggable interface.

Parameters:

event - the current SelectEvent.