TreeViewItem上的WPF TreeView PreviewMouseDown

Question

如果我在TreeViewItem上处理PreviewMouseDown事件，我会在TreeViewItem上点击所有内容，包括左边的小+/-框（Windows XP）。我怎么能区分呢？

我尝试了以下内容：

// 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);
}

我所追求的只是单击树视图项，不包括它似乎包含的额外位。

Answer 1

如果我的理解是正确的，e.OriginalSource应包含您实际点击的控件。确保它是一个TextBlock（或TreeView中的实际内容）。你也可以使用类似this post的东西来确定OriginalSource属于哪个TreeViewItem，如果你是偏执狂。

Answer 2

我的解决方案是使用SelectionItemChanged事件，似乎避免了+/-按钮的问题。