org.jhotdraw.draw
Class DragHandle

java.lang.Object
  org.jhotdraw.draw.AbstractHandle
      org.jhotdraw.draw.DragHandle

All Implemented Interfaces:

java.awt.event.KeyListener, java.util.EventListener, FigureListener, Handle

public class DragHandle
extends AbstractHandle

A handle that changes the location of the owning figure, the handle covers all visible points of the figure.

Usually, DragHandle is not needed, because of the DragTracker in the SelectionTool. Use a (subclass of) DragHandle, if you want to implement figure specific drag behavior. A CompositeFigure can create DragHandle's for all its child figures, to support dragging of child figures without having to decompose the CompositeFigure.

Version:

1.0 July 24, 2007 Created.

Author:

Werner Randelshofer

Field Summary

Fields inherited from class org.jhotdraw.draw.AbstractHandle

listenerList, view

Constructor Summary

DragHandle(Figure owner)
Creates a new instance.

Method Summary

protected java.awt.Rectangle	basicGetBounds()
boolean	contains(java.awt.Point p) Tests if a point is contained in the handle.
void	draw(java.awt.Graphics2D g) Draws nothing.
java.awt.Cursor	getCursor() Returns a cursor for the handle.
void	trackEnd(java.awt.Point anchor, java.awt.Point lead, int modifiersEx) Tracks the end of the interaction.
void	trackStart(java.awt.Point anchor, int modifiersEx) Tracks the start of the interaction.
void	trackStep(java.awt.Point anchor, java.awt.Point lead, int modifiersEx) Tracks a step of the interaction.

Methods inherited from class org.jhotdraw.draw.AbstractHandle

addHandleListener, areaInvalidated, attributeChanged, createSecondaryHandles, dispose, drawCircle, drawDiamond, drawRectangle, figureAdded, figureChanged, figureHandlesChanged, figureRemoved, figureRequestRemove, fireAreaInvalidated, fireHandleRequestRemove, fireHandleRequestSecondaryHandles, fireUndoableEditHappened, getBounds, getDrawingArea, getHandlesize, getOwner, getToolTipText, getView, invalidate, isCombinableWith, keyPressed, keyReleased, keyTyped, removeHandleListener, setView, trackDoubleClick, updateBounds, viewTransformChanged

Methods inherited from class java.lang.Object

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

Constructor Detail

DragHandle

public DragHandle(Figure owner)

Creates a new instance.

Method Detail

draw

public void draw(java.awt.Graphics2D g)

Draws nothing. Drag Handles have no visual appearance of their own.

Specified by:

draw in interface Handle

Overrides:

draw in class AbstractHandle

trackStart

public void trackStart(java.awt.Point anchor,
                       int modifiersEx)

Description copied from interface: Handle

Tracks the start of the interaction. The default implementation does nothing.

Parameters:

anchor - the position where the interaction started

trackStep

public void trackStep(java.awt.Point anchor,
                      java.awt.Point lead,
                      int modifiersEx)

Description copied from interface: Handle

Tracks a step of the interaction.

Parameters:

anchor - the position where the interaction started

lead - the current position

trackEnd

public void trackEnd(java.awt.Point anchor,
                     java.awt.Point lead,
                     int modifiersEx)

Description copied from interface: Handle

Tracks the end of the interaction.

Parameters:

anchor - the position where the interaction started

lead - the current position

contains

public boolean contains(java.awt.Point p)

Description copied from interface: Handle

Tests if a point is contained in the handle.

Specified by:

contains in interface Handle

Overrides:

contains in class AbstractHandle

basicGetBounds

protected java.awt.Rectangle basicGetBounds()

Specified by:

basicGetBounds in class AbstractHandle

getCursor

public java.awt.Cursor getCursor()

Returns a cursor for the handle.

Specified by:

getCursor in interface Handle

Overrides:

getCursor in class AbstractHandle