解决文本框实时校验慢的方法

public class TestWindow extends ApplicationWindow
{
    
    public TestWindow(Shell parentShell)
    {
        super(parentShell);
    }
    
    @Override
    protected Control createContents(Composite parent)
    {
        Composite clientArea = new Composite(parent, SWT.NONE);
        clientArea.setLayout(new RowLayout());
        Text text = new Text((Composite)clientArea, SWT.NONE);
        text.addModifyListener(new MyModifyListener());
        
        return clientArea;
    }
    
    /**
     * @param args
     */
    public static void main(String[] args)
    {
        
       TestWindow testWindow = new TestWindow(Display.getDefault().getActiveShell());
       testWindow.setBlockOnOpen(true);
       testWindow.open();
        
    }
    
    /**
     * 自定义校验类
      * ModifyListener是文本被修改后触发和VerifyListener是将要修改文本时触发,可以通过设置VerifyEvent的doit属性决定是否修改文本
     */
    private class MyModifyListener implements ModifyListener
    {
        private UIJob modifyJob = null;
        
        @Override
        public void modifyText(ModifyEvent e)
        {
            if (null != modifyJob)
            {
                // 取消安排旧修改的校验Job
                modifyJob.cancel();
            }
            
            modifyJob = new UIJob("Validate Job Title") //$NON-NLS-1$
                {
                    @Override
                    protected IStatus runInUIThread(IProgressMonitor monitor)
                    {
                        if (monitor.isCanceled())
                        {
                            return Status.OK_STATUS;
                        }
                        
                        // TODO 这儿是校验逻辑
                        // 注意当逻辑中涉及到界面控件时，要先判断控件是否非空且未被销毁
                        
                        return Status.OK_STATUS;
                    }
                };
            
            // 安排对最新修改的校验Job
            modifyJob.schedule(500);
        }
    }
}