/**
 * Delete a cursor.
 *
 * @param cursor
 *            cursor to delete
 */
public void deleteCursor(ICursor cursor) {
	final IFigure cursorLayer = getFigure(this, CursorLayer.class);
	final LayoutManager layoutManager = cursorLayer.getLayoutManager();
	for (final Object child : cursorLayer.getChildren()) {
		if (cursor.equals(layoutManager.getConstraint((IFigure) child))) {
			deleteCursorFigure((CursorFigure) child);

			for (final ICursorListener listener : fCursorListener) {
				try {
					listener.notifyCursorDeleted(cursor);
				} catch (final Throwable t) {
					// silently ignore
				}
			}

			break;
		}
	}
}
 

protected Dimension calculatePreferredSize( IFigure container, int wHint,
		int hHint )
{		
	Rectangle rect = container.getParent( ).getClientArea( ).getCopy( );
	List list = container.getChildren( );
	if (list.size( ) == 0)
	{
		return Dimension.SINGLETON;
	}
	
	Figure child = (Figure)list.get( 0 );
	
	wHint = Math.max( -1, wHint - container.getInsets( ).getWidth( ) );
	hHint = Math.max( -1, hHint - container.getInsets( ).getHeight( ) );
	
	wHint = Math.max( wHint,rect.width - container.getInsets( ).getWidth( ) );
	hHint = Math.max( hHint, rect.height - container.getInsets( ).getHeight( ) );
	
	if (child instanceof TableFigure && needlayout)
	{
		IFigure tablePane = ( (LayeredPane) ( (LayeredPane) ( (TableFigure) child ).getContents( ) ).getLayer( LayerConstants.PRINTABLE_LAYERS ) ).getLayer( LayerConstants.PRIMARY_LAYER );
		LayoutManager layoutManager = tablePane.getLayoutManager( );
		
		( (TableLayout) layoutManager ).markDirty( );
		container.getBounds( ).width = wHint;
		container.getBounds( ).height = hHint;
		//child.invalidateTree( );
		child.validate( );
		
		//dim = getPreferredSize( container, wHint, hHint ).expand( container.getInsets( ).getWidth( ), container.getInsets( ).getHeight( ) );;
		needlayout = false;
	}
	
	Dimension dim = child.getPreferredSize(wHint, hHint ).expand( container.getInsets( ).getWidth( ), container.getInsets( ).getHeight( ) );

	return dim;
}
 

/**
 * Invalidate should be called whenever visual attributes change
 */
public void invalidate() {
    disposeImage();
    prefSize = null;
    // minSize = null;
    LayoutManager manager = getLayoutManager();
    if (manager != null) {
        manager.invalidate();
    }
    setValid(false);
}
 

@Override
protected LayoutManager createLayoutManager() {
	return new SequenceLayout();
}
 

@Override
protected LayoutManager createLayoutManager() {
	return new ParallelLayout(ILayoutConstants.CONNECTION_RADIUS);
}
 

@Override
protected LayoutManager createLayoutManager() {
	ToolbarLayout layout = new ToolbarLayout();
	layout.setSpacing(ILayoutConstants.VSPACE_BETWEEN_TRACKS);
	return layout;
}
 

@Override
protected LayoutManager createLayoutManager() {
	return new SequenceLayout(ILayoutConstants.MIN_SEGMENT_HEIGHT);
}
 

@Override
protected LayoutManager createLayoutManager() {
	return new SequenceLayout();
}
 

@Override
protected LayoutManager createLayoutManager() {
	return new SequenceLayout();
}
 

@Override
protected LayoutManager createLayoutManager() {
	return new ParallelLayout();
}
 

@Override
protected LayoutManager createLayoutManager() {
	return new CompartmentLayout();
}
 

@Override
protected LayoutManager createLayoutManager() {
	return new ParallelLayout();
}
 

protected LayoutManager getLayoutManager() {
	return new StackLayout();
}
 

protected abstract LayoutManager createLayoutManager();