com.tensegrity.gui.swt.graph
Class ObserverRunnable

java.lang.Object
  com.tensegrity.gui.swt.graph.ObserverRunnable

All Implemented Interfaces:

java.lang.Runnable

public abstract class ObserverRunnable

extends java.lang.Object

implements java.lang.Runnable

This class can be used in an SWT context to implement the Observer.update(Observable, Object) method on custom Observer. The SWT thread model will not allow modifying SWT objects outside of the UI-Thread, so custom observers need to execute their update code into this UI-Thread. This can be done by mean of the Display.syncExec(java.lang.Runnable) or Display.asyncExec(java.lang.Runnable) methods. For a typical example on how one should use this class, see the implementation of SwtGraphPanel.update(Observable, Object). It does the following; public void update(Observable o, Object arg) { Runnable thread = new ObserverRunnable(o, arg) { public void run() { viewScrollingController.updateSliders(); //more code follow .. } }; getDisplay().syncExec(thread); } For more information, one can refer two the following FAQ entry: uithread

Version:

$Id: ObserverRunnable.java,v 1.1 2004/03/26 15:46:13 SebastienGuyon Exp $

Author:

S�bastien Guyon

Constructor Summary

protected

ObserverRunnable(Observable o, java.lang.Object arg) Initializes instances of ObserverRunnable with the passed Observable information.

Method Summary

protected java.lang.Object	getArg() Provides access to the Observable additional arguments.
protected Observable	getObservable() Provides access to the Observable.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Runnable

run

Constructor Detail

ObserverRunnable

protected ObserverRunnable(Observable o,
                           java.lang.Object arg)

Initializes instances of ObserverRunnable with the passed Observable information.

Parameters:

o - an Observable

arg - additional arguments from the Observable

Method Detail

getArg

protected java.lang.Object getArg()

Provides access to the Observable additional arguments.

Returns:

Returns the Observable additional arguments.

getObservable

protected Observable getObservable()

Provides access to the Observable.

Returns:

Returns the Observable.