我需要用閃爍的TreeNode實現自己的TreeView。我的原型是:如何在TreeView中重繪節點(WinForms)
public class BlinkTreeView : TreeView
{
private int blinkInterval;
private bool blinkState;
[Category("Behavior"), Browsable(true)]
public Icon BlinkIcon { get; set; }
[Category("Behavior"), Browsable(true)]
public Icon SelectedBlinkIcon { get; set; }
[Category("Behavior"), Browsable(true), DefaultValue(1000)]
public int BlinkInterval {
get
{
return blinkInterval;
}
set
{
blinkInterval = value;
if (value > 0)
{
blinkTimer.Interval = value;
blinkTimer.Start();
}
else
{
blinkTimer.Stop();
blinkState = false;
Invalidate();
}
}
}
private Timer blinkTimer;
public BlinkTreeView()
: base()
{
blinkTimer = new Timer();
blinkTimer.Tick += new EventHandler(blinkTimer_Tick);
blinkState = false;
this.DrawMode = TreeViewDrawMode.OwnerDrawAll;
}
void blinkTimer_Tick(object sender, EventArgs e)
{
if (BlinkInterval > 0)
{
blinkState = !blinkState;
}
else
{
blinkState = false;
}
Invalidate();
}
protected override void OnDrawNode(DrawTreeNodeEventArgs e)
{
e.DrawDefault = true;
base.OnDrawNode(e);
if (blinkState)
{
//here i want to draw blinked item, but i can't redraw item icons and text.
}
}
}
在OnDrawNode我不能重繪節點的圖標和文本。 任何想法如何解決這個問題?
這是什麼問題?你有什麼例外嗎? – 2009-09-10 08:13:16
不,剛纔e.Graphics我可以在base.OnDrawNode(e)繪製的圖像下繪製; – Chernikov 2009-09-10 08:22:30