Bug 144590 [Accessibility] BIRT custom controls should support active accessibility
Description: BIRT custom controls should support active accessibility. There are some custom controls in BIRT GUI. In Eclipse, when implementing a custom control you should also implement some or all of (as they apply to your control) org.eclipse.swt.accessibility.AccessibleListener, org.eclipse.swt.accessibility.AccessibleControlListener and org.eclipse.swt.accessibility.AccessibleTextListener. Also, the custom control can notify Active Accessibility of changes within the control using org.eclipse.swt.accessibility.Accessible methods such as setFocus(), selectionChanged(), textCaretMoved(), textChanged() and textSelectionChanged().
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/graphics/ImageCanvas.java
sourceImage = null;
		}
		if ( data != null )
			sourceImage = new Image( getDisplay( ), data );
		syncScrollBars( );
	}
	/**
	 * Adjust the image onto the canvas
	 */
	public void fitCanvas( )
	{
		if ( sourceImage == null )
			return;
		Rectangle imageBound = sourceImage.getBounds( );
		Rectangle destRect = getClientArea( );
		double sx = (double) destRect.width / (double) imageBound.width;
		double sy = (double) destRect.height / (double) imageBound.height;
		double s = Math.min( sx, sy );
		double dx = 0.5 * destRect.width;
		double dy = 0.5 * destRect.height;
		centerZoom( dx, dy, s, new AffineTransform( ) );
	}
	/**
	 * Show the image with the original size
	 */
	public void showOriginal( )
	{
		if ( sourceImage == null )
			return;
		transform = new AffineTransform( );