学步园

    在VS2008下封装WinForm自定义Loading控件。

 

     AutoCircle.cs封装了旋转的圆形，直接在里面添加Label的话，计算圆形扇面的方法有点小复杂，所以在LoadingPanel.cs将AutoCircle和Label封装在一起。该控件中提供了当LoadingPanel状态变化时的事件public event RotateStateChangedHandler OnRotateStateChanged，当打开或关闭LoadingPanel时，可以用此事件来禁用/开启页面其他控件或做其他处理。

    LoadingPanel暴露了几个属性可以对AutoCircle进行外观的设置

  

    

private delegate bool DoWorkDelegate();


        public Form1()
        {
            InitializeComponent();

            this.loadingPanel1.OnRotateStateChanged += new LoadingPanel.RotateStateChangedHandler(loadingPanel1_OnRotateStateChanged);
        }

        void loadingPanel1_OnRotateStateChanged()
        {
            this.Invoke(new Action(delegate()
            {
                this.lblTip.Visible = !this.lblTip.Visible;
                this.btnAsync.Enabled = !this.btnAsync.Enabled;
            }));
        }

        private bool DoWork()
        {
            System.Threading.Thread.Sleep(5000);
            return true;
        }

        private void DoWorkCallBack(IAsyncResult ar)
        {
            AsyncResult result = (AsyncResult)ar;
            DoWorkDelegate caller = (DoWorkDelegate)result.AsyncDelegate;
            bool bResult = caller.EndInvoke(ar);

            this.loadingPanel1.Stop();
        }

        private void btnAsync_Click(object sender, EventArgs e)
        {
            DoWorkDelegate doWorkDelegate = this.DoWork;
            doWorkDelegate.BeginInvoke(new AsyncCallback(DoWorkCallBack), null);
            this.loadingPanel1.Start();
        }

    示例源码： 

    下载地址：http://files.cnblogs.com/lichence/CustomizedLoading.rar

    个人学习，仅供参考