Class LightweightSystem

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

public class LightweightSystem extends 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.
  • Constructor Details

    • 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 Details

    • 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