c#treeview点击节点闪烁

 treeview失去焦点时，点击节点闪烁<pre name="code" class="html">  public partial class Sandpic : Form
{

public Sandpic()
{

InitializeComponent();
Load += new EventHandler(Form1_Load);
}

//窗体

  private void Form1_Load(object sender, EventArgs e)        {            SetupBlinkTreeView();         

private void SetupBlinkTreeView(){while (!this.IsHandleCreated) ;//每秒闪烁BlinkTreeNodeRenderer bt1 = new BlinkTreeNodeRenderer(treeView3, 10);BlinkTreeNodeRenderer bt2 = new BlinkTreeNodeRenderer(treeView4, 10);BlinkTreeNodeRenderer bt3 = new BlinkTreeNodeRenderer(goaltreeView, 10);BlinkTreeNodeRenderer bt4 = new BlinkTreeNodeRenderer(TempletreeView, 10);//每秒闪烁10次//  BlinkTreeNodeRenderer bt2 = new BlinkTreeNodeRenderer(treeView4, 10);//每秒闪烁25次// BlinkTreeNodeRenderer bt3 = new BlinkTreeNodeRenderer(treeView3, 25);}}public class BlinkTreeNodeRenderer{private TreeView treeView;private System.Threading.Thread th;private int blinkRate;private bool isBlink = false;public BlinkTreeNodeRenderer(TreeView treeView){Initialize(treeView, 1);}public BlinkTreeNodeRenderer(TreeView treeView, int blinkRate){Initialize(treeView, blinkRate);}private void Initialize(TreeView treeView, int blinkRate){if (blinkRate < 0 || blinkRate > 1000){throw new ArgumentOutOfRangeException("blinkRate", "blinkRate应大于0且小于1000");}this.treeView = treeView;this.blinkRate = blinkRate;this.treeView.HideSelection = false;this.treeView.DrawMode = TreeViewDrawMode.OwnerDrawText;this.treeView.DrawNode += new DrawTreeNodeEventHandler(treeView_DrawNode);this.treeView.Disposed += new EventHandler(treeView_Disposed);this.th = new System.Threading.Thread(new System.Threading.ThreadStart(Blink));this.th.IsBackground = true;this.th.Start();}// 一定的时间间隔更改isBlink的值，并使当前选择节点区域无效（不用对整个控件无效），发送绘制消息private void Blink(){int sleepTime = 1000 / blinkRate;while (true){System.Threading.Thread.Sleep(sleepTime);isBlink = !isBlink;treeView.BeginInvoke(new MethodInvoker(delegate(){if (treeView.SelectedNode != null && treeView.Focused){treeView.Invalidate(treeView.SelectedNode.Bounds);}}));}}private void treeView_DrawNode(object sender, DrawTreeNodeEventArgs e){//设置为false由用户绘制而非操作系统绘制e.DrawDefault = false;if ((e.State & TreeNodeStates.Selected) != 0 || (e.State & TreeNodeStates.Focused) != 0){//判断节点是否已选择或者已获得焦点，如果是true则绘制高亮显示、焦点框e.Graphics.FillRectangle(new SolidBrush(SystemColors.Highlight), e.Bounds);using (Pen focusedPen = new Pen(Color.Black)){focusedPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;Rectangle focusedBounds = e.Bounds;focusedBounds.Size = new Size(e.Bounds.Width - 1, e.Bounds.Height - 1);e.Graphics.DrawRectangle(focusedPen, focusedBounds);}//节点根据isBlink状态绘制显示文本if (isBlink || !treeView.Focused){TextRenderer.DrawText(e.Graphics, e.Node.Text, e.Node.NodeFont, e.Bounds, Color.White);}}else{//绘制未被选择的其余节点TextRenderer.DrawText(e.Graphics, e.Node.Text, e.Node.NodeFont, e.Bounds, e.Node.ForeColor);}}private void treeView_Disposed(object sender, EventArgs e){th.Abort();th = null;}}