gov.nasa.worldwind.util.tree
Class DragControl

java.lang.Object
  gov.nasa.worldwind.avlist.AVListImpl
      gov.nasa.worldwind.util.AbstractHotSpot
          gov.nasa.worldwind.util.tree.TreeHotSpot
              gov.nasa.worldwind.util.tree.DragControl

All Implemented Interfaces:

AVList, SelectListener, HotSpot, KeyListener, MouseListener, MouseMotionListener, MouseWheelListener, EventListener

Direct Known Subclasses:

ScrollBar.ScrollKnob, ScrollFrame

public abstract class DragControl
extends TreeHotSpot

A TreeHotSpot that can handle drag events.

Field Summary

protected boolean	dragging
protected Point	dragRefPoint

Fields inherited from class gov.nasa.worldwind.util.tree.TreeHotSpot

parent

Fields inherited from class gov.nasa.worldwind.util.AbstractHotSpot

active

Constructor Summary

DragControl(HotSpot parent)
Create a drag control.

Method Summary

protected void	beginDrag(Point point) Called when a drag begins.
protected abstract void	drag(Point point) Called for each point within a drag action.
protected void	endDrag() Called when a drag action ends.
boolean	isDragging() Is the control currently dragging?
void	selected(SelectEvent event) Handle a SelectEvent and call beginDrag(java.awt.Point), drag(java.awt.Point), endDrag() as appropriate.

Methods inherited from class gov.nasa.worldwind.util.tree.TreeHotSpot

mouseClicked, mousePressed, mouseReleased, mouseWheelMoved

Methods inherited from class gov.nasa.worldwind.util.AbstractHotSpot

getCursor, isActive, isConsumed, keyPressed, keyReleased, keyTyped, mouseDragged, mouseEntered, mouseExited, mouseMoved, setActive

Methods inherited from class gov.nasa.worldwind.avlist.AVListImpl

addPropertyChangeListener, addPropertyChangeListener, clearList, copy, firePropertyChange, firePropertyChange, getBooleanValue, getBooleanValue, getChangeSupport, getDoubleValue, getDoubleValue, getEntries, getIntegerValue, getIntegerValue, getLongValue, getLongValue, getRestorableStateForAVPair, getStringValue, getStringValue, getStringValue, getValue, getValues, hasKey, removeKey, removePropertyChangeListener, removePropertyChangeListener, setValue, setValues

Methods inherited from class java.lang.Object

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

Field Detail

dragging

protected boolean dragging

dragRefPoint

protected Point dragRefPoint

Constructor Detail

DragControl

public DragControl(HotSpot parent)

Create a drag control.

Parameters:

parent - The screen area that contains this drag control. Input events that cannot be handled by this object will be passed to the parent. May be null.

Method Detail

beginDrag

protected void beginDrag(Point point)

Called when a drag begins. This implementation saves the first drag point to dragRefPoint.

Parameters:

point - Point at which dragging started.

drag

protected abstract void drag(Point point)

Called for each point within a drag action.

Parameters:

point - Current drag point.

endDrag

protected void endDrag()

Called when a drag action ends. This implementation sets dragRefPoint to null.

isDragging

public boolean isDragging()

Is the control currently dragging?

Returns:

True if the control is dragging.

selected

public void selected(SelectEvent event)

Handle a SelectEvent and call beginDrag(java.awt.Point), drag(java.awt.Point), endDrag() as appropriate. Subclasses may override this method if they need to handle events other than drag events.

Specified by:

selected in interface SelectListener

Specified by:

selected in interface HotSpot

Overrides:

selected in class TreeHotSpot

Parameters:

event - Select event.