wx.TreeCtrl拖放，复制和移动 [英] wx.TreeCtrl drag and drop, copy and move

问题描述

我正在尝试在wx.TreeCtrl上实现拖放，我需要处理
复制和移动操作（如果用户按住CTRL按钮）。

首先，我搜索了维基一个例子，我被困惑为
要使用的方法..我应该使用DropSource / DropTarget还是只需
句柄EVT_TREE_BEGIN_DRAG和EVT_TREE_END_DRAG？

如果是后者，我该如何判断用户是否要求移动
操作？

I'm trying to implement drag and drop on a wx.TreeCtrl and I need to handle both "copy" and "move" operations (if the user keeps CTRL pressed).
First of all, I searched the wiki for an example and I'm confused as to which method to use.. Should I use DropSource/DropTarget or just handle EVT_TREE_BEGIN_DRAG and EVT_TREE_END_DRAG?
If the latter, how can I tell if the user is requesting a "move" operation?

（wxPython 2.8.9.1在Ubuntu Jaunty上）

(wxPython 2.8.9.1 on Ubuntu Jaunty)

推荐答案

从使用wxWidgets进行跨平台GUI编程阅读相关段落，为我提供了解决问题的必要洞察力问题:)

最后我去了第一个解决方案（DropSource / DropTarget），所以：

Reading the relevant paragraph from Cross-Platform GUI Programming with wxWidgets gave me the necessary insight to solve the issue :)
In the end I went for the first solution (DropSource/DropTarget), so:

tree.SetDropTarget(MyDropTarget())
tree.Bind(wx.EVT_TREE_BEGIN_DRAG, self.on_drag)
tree.GetMainWindow().Bind(wx.EVT_MOUSE_CAPTURE_LOST, lambda x: None)

（第二个绑定避免了一个神秘的捕获鼠标的窗口拖动时没有处理wxEVT_MOUSE_CAPTURE_LOST）

(The second bind avoids a mysterious "window that captured the mouse didn't process wxEVT_MOUSE_CAPTURE_LOST" on dragging)

def on_drag(self, evt):
   # No evt.Allow() here, I won't use TreeCtrl's internal DND support
   item = evt.GetItem()
   if item == self.tree.GetRootItem():
      return
   dropsrc = wx.DropSource(self)
   # Populate dropsource
   # ...
   dropsrc.DoDragDrop(wx.Drag_AllowMove)

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