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

  

    

1 private delegate bool DoWorkDelegate();  2  3  4         public Form1()  5         {
     6             InitializeComponent();  7  8             this.loadingPanel1.OnRotateStateChanged += new LoadingPanel.RotateStateChangedHandler(loadingPanel1_OnRotateStateChanged);  9         } 10 11         void loadingPanel1_OnRotateStateChanged() 12         {
    13             this.Invoke(new Action(delegate() 14             {
    15                 this.lblTip.Visible = !this.lblTip.Visible; 16                 this.btnAsync.Enabled = !this.btnAsync.Enabled; 17             })); 18         } 19 20         private bool DoWork() 21         {
    22             System.Threading.Thread.Sleep(5000); 23             return true; 24         } 25 26         private void DoWorkCallBack(IAsyncResult ar) 27         {
    28             AsyncResult result = (AsyncResult)ar; 29             DoWorkDelegate caller = (DoWorkDelegate)result.AsyncDelegate; 30             bool bResult = caller.EndInvoke(ar); 31 32             this.loadingPanel1.Stop(); 33         } 34 35         private void btnAsync_Click(object sender, EventArgs e) 36         {
    37             DoWorkDelegate doWorkDelegate = this.DoWork; 38             doWorkDelegate.BeginInvoke(new AsyncCallback(DoWorkCallBack), null); 39             this.loadingPanel1.Start(); 40         }

    示例源码： 

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