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
transform = af;
		syncScrollBars( );
	}
	/**
	 * Zoom in the image.
	 */
	public void zoomIn( )
	{
		if ( sourceImage == null )
			return;
		Rectangle rect = getClientArea( );
		int w = rect.width, h = rect.height;
		double dx = ( (double) w ) / 2;
		double dy = ( (double) h ) / 2;
		centerZoom( dx, dy, ZOOMIN_RATE, transform );
	}
	/**
	 * Zoom out the image.
	 */
	public void zoomOut( )
	{
		if ( sourceImage == null )
			return;
		Rectangle rect = getClientArea( );
		int w = rect.width, h = rect.height;
		double dx = ( (double) w ) / 2;
		double dy = ( (double) h ) / 2;
		centerZoom( dx, dy, ZOOMOUT_RATE, transform );
	}
}