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org.eclipse.draw2d
Class LightweightSystem

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

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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.

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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

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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

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controlResized

protected void controlResized()

Resizes and revalidates the root figure when the control is resized.

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getEventDispatcher

protected 
EventDispatcher getEventDispatcher()

Returns this LightwightSystem's EventDispatcher.

Returns:

the event dispatcher

Since:

2.0

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getRootFigure

public 
IFigure getRootFigure()

Returns this LightweightSystem's root figure.

Returns:

the root figure

Since:

2.0

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createEventHandler

protected final 
LightweightSystem.EventHandler createEventHandler()

Returns a new instance of this LightweightSystem's EventHandler.

Returns:

the newly created event handler

Since:

2.0

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createRootFigure

protected 
LightweightSystem.RootFigure createRootFigure()

Creates and returns the root figure.

Returns:

the newly created root figure

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getUpdateManager

public 
UpdateManager getUpdateManager()

Returns this LightweightSystem's UpdateManager.

Returns:

the update manager

Since:

2.0

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init

protected void init()

Initializes this LightweightSystem by setting the root figure.

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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

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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

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setControl

public void setControl(Canvas c)

Sets the LightweightSystem's control to the passed Canvas.

Parameters:

c - the canvas

Since:

2.0

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setEventDispatcher

public void setEventDispatcher(
EventDispatcher dispatcher)

Sets this LightweightSystem's EventDispatcher.

Parameters:

dispatcher - the new event dispatcher

Since:

2.0

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setRootPaneFigure

protected void setRootPaneFigure(
LightweightSystem.RootFigure root)

Sets this LightweightSystem's root figure.

Parameters:

root - the new root figure

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setUpdateManager

public void setUpdateManager(
UpdateManager um)

Sets this LightweightSystem's UpdateManager.

Parameters:

um - the new update manager

Since:

2.0

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