org.jhotdraw.draw
Class NullHandle

java.lang.Object
  org.jhotdraw.draw.AbstractHandle
      org.jhotdraw.draw.LocatorHandle
          org.jhotdraw.draw.NullHandle

All Implemented Interfaces:

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

public class NullHandle
extends LocatorHandle

A handle that doesn't change the owned figure. Its only purpose is to show feedback that a figure is selected.

Version:

1.0 2003-12-01 Derived from JHotDraw 5.4b1.

Author:

Werner Randelshofer

Field Summary

Fields inherited from class org.jhotdraw.draw.AbstractHandle

listenerList, view

Constructor Summary

NullHandle(Figure owner, Locator locator)
Creates a new instance.

Method Summary

static void	addLeadHandles(Figure f, java.util.Collection<Handle> handles) Creates handles for each lead of a figure and adds them to the provided collection.
void	draw(java.awt.Graphics2D g) Draws this handle.
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.LocatorHandle

basicGetBounds, getLocation, getLocationOnDrawing

Methods inherited from class org.jhotdraw.draw.AbstractHandle

addHandleListener, areaInvalidated, attributeChanged, contains, 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

NullHandle

public NullHandle(Figure owner,
                  Locator locator)

Creates a new instance.

Method Detail

getCursor

public java.awt.Cursor getCursor()

Description copied from class: AbstractHandle

Returns a cursor for the handle.

Specified by:

getCursor in interface Handle

Overrides:

getCursor 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

addLeadHandles

public static void addLeadHandles(Figure f,
                                  java.util.Collection<Handle> handles)

Creates handles for each lead of a figure and adds them to the provided collection.

draw

public void draw(java.awt.Graphics2D g)

Draws this handle. Null Handles are drawn as unfilled rectangles.

Specified by:

draw in interface Handle

Overrides:

draw in class AbstractHandle