org.jhotdraw.draw.event

Class FigureEvent

java.lang.Object

java.util.EventObject

org.jhotdraw.draw.event.FigureEvent

All Implemented Interfaces:

java.io.Serializable

public class FigureEvent
extends java.util.EventObject

An EventObject sent to FigureListeners. Design Patterns

Observer
State changes of figures can be observed by other objects. Specifically CompositeFigure observes area invalidations and remove requests of its child figures. DrawingView also observes area invalidations of its drawing object. Subject: Figure; Observer: FigureListener; Event: FigureEvent; Concrete Observer: CompositeFigure, DrawingView.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
FigureEvent(Figure source, AttributeKey attribute, java.lang.Object oldValue, java.lang.Object newValue) Constructs an event for the given source Figure.
FigureEvent(Figure source, java.awt.geom.Rectangle2D.Double invalidatedArea) Constructs an event for the given source Figure.

Method Summary

Modifier and Type	Method and Description
AttributeKey	getAttribute()
Figure	getFigure() Gets the changed figure
java.awt.geom.Rectangle2D.Double	getInvalidatedArea() Gets the bounds of the invalidated area on the drawing.
java.lang.Object	getNewValue()
java.lang.Object	getOldValue()

Methods inherited from class java.util.EventObject

getSource, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

FigureEvent

public FigureEvent(Figure source,
                   java.awt.geom.Rectangle2D.Double invalidatedArea)

Constructs an event for the given source Figure.

Parameters:

invalidatedArea - The bounds of the invalidated area on the drawing.

FigureEvent

public FigureEvent(Figure source,
                   AttributeKey attribute,
                   @Nullable
                   java.lang.Object oldValue,
                   @Nullable
                   java.lang.Object newValue)

Constructs an event for the given source Figure.

Method Detail

getFigure

public Figure getFigure()

Gets the changed figure

getInvalidatedArea

@Nullable
public java.awt.geom.Rectangle2D.Double getInvalidatedArea()

Gets the bounds of the invalidated area on the drawing.

getAttribute

public AttributeKey getAttribute()

getOldValue

@Nullable
public java.lang.Object getOldValue()

getNewValue

@Nullable
public java.lang.Object getNewValue()