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Eclipse Draw2d
3.3

org.eclipse.draw2d
Class LightweightSystem

java.lang.Object
  extended by
org.eclipse.draw2d.LightweightSystem

public class LightweightSystem
extends java.lang.Object

The LightweightSystem is the link between SWT and Draw2d. It is the component that provides the ability for Figures to be hosted on an SWT Canvas.

Normal procedure for using a LightweightSystem:

  1. Create an SWT Canvas.
  2. Create a LightweightSystem passing it that Canvas.
  3. Create a Draw2d Figure and call setContents(IFigure). This Figure will be the top-level Figure of the Draw2d application.


Nested Class Summary
protected  class LightweightSystem.EventHandler
          Listener used to get all necessary events from the Canvas and pass them on to the EventDispatcher.
protected  class LightweightSystem.RootFigure
          The figure at the root of the LightweightSystem.
 
Constructor Summary
LightweightSystem ()
          Constructs a LightweightSystem without a Canvas.
LightweightSystem (Canvas c)
          Constructs a LightweightSystem on Canvas c.
 
Method Summary
protected  void addListeners ()
          Adds SWT listeners to the LightWeightSystem's Canvas.
protected  void controlResized ()
          Resizes and revalidates the root figure when the control is resized.
protected   LightweightSystem.EventHandler createEventHandler ()
          Returns a new instance of this LightweightSystem's EventHandler.
protected   LightweightSystem.RootFigure createRootFigure ()
          Creates and returns the root figure.
protected   EventDispatcher getEventDispatcher ()
          Returns this LightwightSystem's EventDispatcher.
  IFigure getRootFigure ()
          Returns this LightweightSystem's root figure.
  UpdateManager getUpdateManager ()
          Returns this LightweightSystem's UpdateManager.
protected  void init ()
          Initializes this LightweightSystem by setting the root figure.
 void paint (GC gc)
          Invokes this LightweightSystem's UpdateManager to paint this LightweightSystem's Canvas and contents.
 void setContents ( IFigure figure)
          Sets the contents of the LightweightSystem to the passed figure.
 void setControl (Canvas c)
          Sets the LightweightSystem's control to the passed Canvas.
 void setEventDispatcher ( EventDispatcher dispatcher)
          Sets this LightweightSystem's EventDispatcher.
protected  void setRootPaneFigure ( LightweightSystem.RootFigure root)
          Sets this LightweightSystem's root figure.
 void setUpdateManager ( UpdateManager um)
          Sets this LightweightSystem's UpdateManager.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

LightweightSystem

public LightweightSystem(Canvas c)
Constructs a LightweightSystem on Canvas c.

Parameters:
c - the canvas
Since:
2.0

LightweightSystem

public LightweightSystem()
Constructs a LightweightSystem without a Canvas.

Method Detail

addListeners

protected void addListeners()
Adds SWT listeners to the LightWeightSystem's Canvas. This allows for SWT events to be dispatched and handled by its EventDispatcher.

WARNING: This method should not be overridden.

Since:
2.0

controlResized

protected void controlResized()
Resizes and revalidates the root figure when the control is resized.


getEventDispatcher

protected 
EventDispatcher getEventDispatcher()
Returns this LightwightSystem's EventDispatcher.

Returns:
the event dispatcher
Since:
2.0

getRootFigure

public 
IFigure getRootFigure()
Returns this LightweightSystem's root figure.

Returns:
the root figure
Since:
2.0

createEventHandler

protected final 
LightweightSystem.EventHandler createEventHandler()
Returns a new instance of this LightweightSystem's EventHandler.

Returns:
the newly created event handler
Since:
2.0

createRootFigure

protected 
LightweightSystem.RootFigure createRootFigure()
Creates and returns the root figure.

Returns:
the newly created root figure

getUpdateManager

public 
UpdateManager getUpdateManager()
Returns this LightweightSystem's UpdateManager.

Returns:
the update manager
Since:
2.0

init

protected void init()
Initializes this LightweightSystem by setting the root figure.


paint

public void paint(GC gc)
Invokes this LightweightSystem's UpdateManager to paint this LightweightSystem's Canvas and contents.

Parameters:
gc - the GC used for painting
Since:
2.0

setContents

public void setContents(
IFigure figure)
Sets the contents of the LightweightSystem to the passed figure. This figure should be the top-level Figure in a Draw2d application.

Parameters:
figure - the new root figure
Since:
2.0

setControl

public void setControl(Canvas c)
Sets the LightweightSystem's control to the passed Canvas.

Parameters:
c - the canvas
Since:
2.0

setEventDispatcher

public void setEventDispatcher(
EventDispatcher dispatcher)
Sets this LightweightSystem's EventDispatcher.

Parameters:
dispatcher - the new event dispatcher
Since:
2.0

setRootPaneFigure

protected void setRootPaneFigure(
LightweightSystem.RootFigure root)
Sets this LightweightSystem's root figure.

Parameters:
root - the new root figure

setUpdateManager

public void setUpdateManager(
UpdateManager um)
Sets this LightweightSystem's UpdateManager.

Parameters:
um - the new update manager
Since:
2.0

Eclipse Draw2d
3.3

Copyright (c) IBM Corp. and others 2000, 2007. All Rights Reserved.

 
 
  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire