Bug 168888 [Wizards] PageTransition classes may need rename/reorg
bundles/org.eclipse.jface/src/org/eclipse/jface/wizard/WizardDialog.java
*/
    private Point calculatePageSizeDelta(IWizardPage page) {
        Control pageControl = page.getControl();
        if (pageControl == null) {
			
            return new Point(0, 0);
		}
        Point contentSize = pageControl.computeSize(SWT.DEFAULT, SWT.DEFAULT,
                true);
        Rectangle rect = pageContainerLayout.getClientArea(pageContainer);
        Point containerSize = new Point(rect.width, rect.height);
        return new Point(Math.max(0, contentSize.x - containerSize.x), Math
                .max(0, contentSize.y - containerSize.y));
    }
    /* (non-Javadoc)
     * Method declared on Dialog.
     */
    protected void cancelPressed() {
        if (activeRunningOperations <= 0) {
            
            
            
            
            setReturnCode(CANCEL);
            close();
        } else {
            cancelButton.setEnabled(false);
        }
    }
    /*