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wxPython:拖放(Drag & drop)

Posted by Ross Wan 于 2008/04/27

       拖放操作,实质上是将数据源(A data source)的一部分数据(Some data)拖放到目的数据处(A data target)。所有,我们必须有:

  • Some data
  • A data source
  • A data target

       wxPython 提供了2个预定义的 data targets:wx.TextDropTarget 和 wx.FileDropTarget。

wx.TextDropTarget

#!/usr/bin/python
# dragdrop.py

import os
import wx

class MyTextDropTarget(wx.TextDropTarget):
    def __init__(self, object):
        wx.TextDropTarget.__init__(self)
        self.object = object

    def OnDropText(self, x, y, data):
        self.object.InsertStringItem(0, data)

class DragDrop(wx.Frame):
    def __init__(self, parent, id, title):
        wx.Frame.__init__(self, parent, id, title, size=(650, 500))

        splitter1 = wx.SplitterWindow(self, -1, style=wx.SP_3D)
        splitter2 = wx.SplitterWindow(splitter1, -1, style=wx.SP_3D)
        self.dir = wx.GenericDirCtrl(splitter1, -1, dir=’/home/’, style=wx.DIRCTRL_DIR_ONLY)
        self.lc1 = wx.ListCtrl(splitter2, -1, style=wx.LC_LIST)
        self.lc2 = wx.ListCtrl(splitter2, -1, style=wx.LC_LIST)

        dt = MyTextDropTarget(self.lc2)
        self.lc2.SetDropTarget(dt)
        self.Bind(wx.EVT_LIST_BEGIN_DRAG, self.OnDragInit, id=self.lc1.GetId())

        tree = self.dir.GetTreeCtrl()

        splitter2.SplitHorizontally(self.lc1, self.lc2)
        splitter1.SplitVertically(self.dir, splitter2)

        self.Bind(wx.EVT_TREE_SEL_CHANGED, self.OnSelect, id=tree.GetId())

        self.OnSelect(0)
        self.Centre()
        self.Show(True)

    def OnSelect(self, event):
        list = os.listdir(self.dir.GetPath())
        self.lc1.ClearAll()
        self.lc2.ClearAll()
        for i in range(len(list)):
            if list[i][0] != ‘.’:
                self.lc1.InsertStringItem(0, list[i])

    def OnDragInit(self, event):
        text = self.lc1.GetItemText(event.GetIndex())
        tdo = wx.TextDataObject(text)
        tds = wx.DropSource(self.lc1)
        tds.SetData(tdo)
        tds.DoDragDrop(True)

app = wx.App()
DragDrop(None, -1, ‘dragdrop.py’)
app.MainLoop()

wx.FileDropTarget

#!/usr/bin/python
# filedrop.py

import wx

class FileDrop(wx.FileDropTarget):
    def __init__(self, window):
        wx.FileDropTarget.__init__(self)
        self.window = window

    def OnDropFiles(self, x, y, filenames):

        for name in filenames:
            try:
                file = open(name, ‘r’)
                text = file.read()
                self.window.WriteText(text)
                file.close()
            except IOError, error:
                dlg = wx.MessageDialog(None, ‘Error opening file\n’ + str(error))
                dlg.ShowModal()
            except UnicodeDecodeError, error:
                dlg = wx.MessageDialog(None, ‘Cannot open non ascii files\n’ + str(error))
                dlg.ShowModal()

class DropFile(wx.Frame):
    def __init__(self, parent, id, title):
        wx.Frame.__init__(self, parent, id, title, size = (450, 400))

        self.text = wx.TextCtrl(self, -1, style = wx.TE_MULTILINE)
        dt = FileDrop(self.text)
        self.text.SetDropTarget(dt)
        self.Centre()
        self.Show(True)

app = wx.App()
DropFile(None, -1, ‘filedrop.py’)
app.MainLoop()

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3条回应 to “wxPython:拖放(Drag & drop)”

  1. Ross Wan said

    翻译自:The wxPython tutorial

  2. Jacky said

    请问如何拖拽 非text和file 数据对象?比如用wx.lib.ogl.RectangleShape 生成的图形对象。

  3. 太棒了
    非常感谢你的工作

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