TreeViewItem上的WPF TreeView PreviewMouseDown

Question

如果我在TreeViewItem上處理PreviewMouseDown事件，那麼我會點擊TreeViewItem的左側（Windows XP）包含的小+/-框來獲取事件。我如何區分這一點？

我試過如下：

// We've had a single click on a tree view item 
// Unfortunately this is the WHOLE tree item, including the +/- 
// symbol to the left. The tree doesn't do a selection, so we 
// have to filter this out... 
MouseDevice device = e.Device as MouseDevice; 

// This is bad. The whole point of WPF is for the code 
// not to know what the UI has - yet here we are testing for 
// it as a workaround. Sigh... 

// This is broken - if you click on the +/- on a item, it shouldn't 
// go on to be processed by OnTreeSingleClick... ho hum! 
if (device.DirectlyOver.GetType() != typeof(Path)) 
{ 
    OnTreeSingleClick(sender); 
} 

我後是不包括它似乎包括額外的比特樹型視圖項目只是單一的點擊。

Answer 1

我的解決方案是使用SelectionItemChanged事件，似乎避免了+/-按鈕的問題。

Answer 2

如果我的理解是正確的，e.OriginalSource應該包含您控制的實際上點擊。確保它是一個TextBlock（或其他任何實際在你的TreeView中）。如果您是偏執狂的，您也可以使用類似this post的東西來確定OriginalSource屬於哪個TreeViewItem。