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Eclipse Draw2d
3.3

org.eclipse.draw2d
Class DeferredUpdateManager

java.lang.Object
  extended by

org.eclipse.draw2d.UpdateManager
      extended by
org.eclipse.draw2d.DeferredUpdateManager

public class DeferredUpdateManager
extends UpdateManager

An UpdateManager that asynchronously updates the affected figures.


Nested Class Summary
protected  class DeferredUpdateManager.UpdateRequest
          Calls performUpdate().
 
Constructor Summary
DeferredUpdateManager ()
          Empty constructor.
DeferredUpdateManager ( GraphicsSource gs)
          Constructs a new DererredUpdateManager with the given GraphicsSource.
 
Method Summary
 void addDirtyRegion ( IFigure figure, int x, int y, int w, int h)
          Adds a dirty region (defined by the rectangle x, y, w, h) to the update queue.
 void addInvalidFigure ( IFigure f)
          Adds the given figure to the update queue.
protected   Graphics getGraphics ( Rectangle region)
          Returns a Graphics object for the given region.
 void performUpdate ()
          Performs the update.
 void performUpdate ( Rectangle exposed)
          Adds the given exposed region to the update queue and then performs the update.
 void performValidation ()
          Performs a partial update if supported (validation only).
protected  void queueWork ()
          Posts an DeferredUpdateManager.UpdateRequest using Display#asyncExec(Runnable).
protected  void releaseGraphics ( Graphics graphics)
          Releases the graphics object, which causes the GraphicsSource to flush.
protected  void repairDamage ()
          Repaints the dirty regions on the update queue and calls UpdateManager.firePainting(Rectangle, Map), unless there are no dirty regions.
 void runWithUpdate (java.lang.Runnable runnable)
          Adds the given runnable and queues an update if an update is not under progress.
protected  void sendUpdateRequest ()
          Fires the UpdateRequest to the current display asynchronously.
 void setGraphicsSource ( GraphicsSource gs)
          Sets the graphics source.
 void setRoot ( IFigure figure)
          Sets the root figure.
protected  void validateFigures ()
          Validates all invalid figures on the update queue and calls UpdateManager.fireValidating() unless there are no invalid figures.
 
Methods inherited from class org.eclipse.draw2d. UpdateManager
addDirtyRegion, addUpdateListener, dispose, firePainting, fireValidating, isDisposed, removeUpdateListener
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DeferredUpdateManager

public DeferredUpdateManager()
Empty constructor.


DeferredUpdateManager

public DeferredUpdateManager(
GraphicsSource gs)
Constructs a new DererredUpdateManager with the given GraphicsSource.

Parameters:
gs - the graphics source
Method Detail

addDirtyRegion

public void addDirtyRegion(
IFigure figure,
                           int x,
                           int y,
                           int w,
                           int h)
Adds a dirty region (defined by the rectangle x, y, w, h) to the update queue. If the figure isn't visible or either the width or height are 0, the method returns without queueing the dirty region.

Specified by:
addDirtyRegion in class UpdateManager
Parameters:
figure - the figure that contains the dirty region
x - the x coordinate of the dirty region
y - the y coordinate of the dirty region
w - the width of the dirty region
h - the height of the dirty region

addInvalidFigure

public void addInvalidFigure(
IFigure f)
Adds the given figure to the update queue. Invalid figures will be validated before the damaged regions are repainted.

Specified by:
addInvalidFigure in class UpdateManager
Parameters:
f - the invalid figure

getGraphics

protected 
Graphics getGraphics(
Rectangle region)
Returns a Graphics object for the given region.

Parameters:
region - the region to be repainted
Returns:
the Graphics object

performUpdate

public void performUpdate()
Performs the update. Validates the invalid figures and then repaints the dirty regions.

Specified by:
performUpdate in class UpdateManager
See Also:
validateFigures(), repairDamage()

performValidation

public void performValidation()
Description copied from class: UpdateManager
Performs a partial update if supported (validation only). Fires notification to listeners that validation has been performed. By default this method calls UpdateManager.performUpdate(). Subclasses should override this method to support validation without repainting.

Overrides:
performValidation in class UpdateManager
See Also:
UpdateManager.performValidation()

performUpdate

public void performUpdate(
Rectangle exposed)
Adds the given exposed region to the update queue and then performs the update.

Specified by:
performUpdate in class UpdateManager
Parameters:
exposed - the exposed region

queueWork

protected void queueWork()
Posts an DeferredUpdateManager.UpdateRequest using Display#asyncExec(Runnable). If work has already been queued, a new request is not needed.


sendUpdateRequest

protected void sendUpdateRequest()
Fires the UpdateRequest to the current display asynchronously.

Since:
3.2

releaseGraphics

protected void releaseGraphics(
Graphics graphics)
Releases the graphics object, which causes the GraphicsSource to flush.

Parameters:
graphics - the graphics object

repairDamage

protected void repairDamage()
Repaints the dirty regions on the update queue and calls UpdateManager.firePainting(Rectangle, Map), unless there are no dirty regions.


runWithUpdate

public void runWithUpdate(java.lang.Runnable runnable)
Adds the given runnable and queues an update if an update is not under progress.

Overrides:
runWithUpdate in class UpdateManager
Parameters:
runnable - the runnable

setGraphicsSource

public void setGraphicsSource(
GraphicsSource gs)
Sets the graphics source.

Specified by:
setGraphicsSource in class UpdateManager
Parameters:
gs - the graphics source

setRoot

public void setRoot(
IFigure figure)
Sets the root figure.

Specified by:
setRoot in class UpdateManager
Parameters:
figure - the root figure

validateFigures

protected void validateFigures()
Validates all invalid figures on the update queue and calls UpdateManager.fireValidating() unless there are no invalid figures.


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