org.jhotdraw.draw
Class DragTracker

java.lang.Object
  org.jhotdraw.beans.AbstractBean
      org.jhotdraw.draw.AbstractTool
          org.jhotdraw.draw.DragTracker

All Implemented Interfaces:

java.awt.event.KeyListener, java.awt.event.MouseListener, java.awt.event.MouseMotionListener, java.io.Serializable, java.lang.Cloneable, java.util.EventListener, Tool

public class DragTracker
extends AbstractTool

DragTracker implements interactions with the content area of a Figure.

The DragTracker handles one of the three states of the SelectionTool. It comes into action, when the user presses the mouse button over the content area of a Figure.

Version:

2.0.1 2007-11-05 Fixed a null pointer exception in method mousePressed which occured, when the user deselected the selected figure using shift-click.
2.0 2006-01-14 Changed to support double precision coordinates.
1.0 2003-12-01 Derived from JHotDraw 5.4b1.

Author:

Werner Randelshofer

See Also:

SelectionTool, Serialized Form

Field Summary

protected Figure	anchorFigure
protected java.awt.geom.Point2D.Double	anchorOrigin The anchorOrigin holds the origin of all dragged figures of the mousePressed event.
protected java.awt.geom.Point2D.Double	anchorPoint The anchorPoint holds the location of the mouse of the mousePressed event.
protected java.awt.geom.Rectangle2D.Double	dragRect The drag rectangle encompasses the bounds of all dragged figures.
protected java.awt.geom.Point2D.Double	previousOrigin The previousOrigin holds the origin of all dragged figures of the previous mouseDragged event.
protected java.awt.geom.Point2D.Double	previousPoint The previousPoint holds the location of the mouse of the previous mouseDragged event.

Fields inherited from class org.jhotdraw.draw.AbstractTool

anchor, editor, isWorking, listenerList

Fields inherited from class org.jhotdraw.beans.AbstractBean

propertySupport

Constructor Summary

DragTracker(Figure figure)
Creates a new instance.

Method Summary

void	mouseDragged(java.awt.event.MouseEvent evt)
void	mouseMoved(java.awt.event.MouseEvent evt)
void	mousePressed(java.awt.event.MouseEvent evt)
void	mouseReleased(java.awt.event.MouseEvent evt)

Methods inherited from class org.jhotdraw.draw.AbstractTool

activate, addToolListener, addUndoableEditListener, constrainPoint, constrainPoint, createActionMap, createInputMap, deactivate, draw, editCopy, editCut, editDelete, editDuplicate, editPaste, fireAreaInvalidated, fireAreaInvalidated, fireToolDone, fireToolStarted, getActionMap, getDrawing, getEditor, getInputMap, getView, isActive, keyPressed, keyReleased, keyTyped, mouseClicked, mouseEntered, mouseExited, removeToolListener, removeUndoableEditListener, setActionMap, setInputMap, updateCursor, viewToDrawing

Methods inherited from class org.jhotdraw.beans.AbstractBean

addPropertyChangeListener, addPropertyChangeListener, clone, firePropertyChange, firePropertyChange, firePropertyChange, removePropertyChangeListener, removePropertyChangeListener

Methods inherited from class java.lang.Object

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

Field Detail

anchorFigure

protected Figure anchorFigure

dragRect

protected java.awt.geom.Rectangle2D.Double dragRect

The drag rectangle encompasses the bounds of all dragged figures.

previousOrigin

protected java.awt.geom.Point2D.Double previousOrigin

The previousOrigin holds the origin of all dragged figures of the previous mouseDragged event. This coordinate is constrained using the Constrainer of the DrawingView.

anchorOrigin

protected java.awt.geom.Point2D.Double anchorOrigin

The anchorOrigin holds the origin of all dragged figures of the mousePressed event.

previousPoint

protected java.awt.geom.Point2D.Double previousPoint

The previousPoint holds the location of the mouse of the previous mouseDragged event. This coordinate is not constrained using the Constrainer of the DrawingView.

anchorPoint

protected java.awt.geom.Point2D.Double anchorPoint

The anchorPoint holds the location of the mouse of the mousePressed event. This coordinate is not constrained using the Constrainer of the DrawingView.

Constructor Detail

DragTracker

public DragTracker(Figure figure)

Creates a new instance.

Method Detail

mouseMoved

public void mouseMoved(java.awt.event.MouseEvent evt)

Specified by:

mouseMoved in interface java.awt.event.MouseMotionListener

Overrides:

mouseMoved in class AbstractTool

mousePressed

public void mousePressed(java.awt.event.MouseEvent evt)

Specified by:

mousePressed in interface java.awt.event.MouseListener

Overrides:

mousePressed in class AbstractTool

mouseDragged

public void mouseDragged(java.awt.event.MouseEvent evt)

mouseReleased

public void mouseReleased(java.awt.event.MouseEvent evt)

Specified by:

mouseReleased in interface java.awt.event.MouseListener

Overrides:

mouseReleased in class AbstractTool