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下面的代码创建一个带有列表框的框架来拖放。 我想了解在下面的行代码..Python框架 - 列表框
FileAndTextDropTarget是class..This类被称为有2个功能 - OnFileDrop & OnTextDrop..My问题是OnFileDrop或OnTextDrop怎么叫没有参数文件或文本传递..
self.dt = FileAndTextDropTarget（self.OnFileDrop， self.OnTextDrop）
代码：
class DropTargetFrame(wx.Frame):
pdb.set_trace()
def __init__(self, parent, id=wx.ID_ANY, title="",
pos=wx.DefaultPosition, size=wx.DefaultSize,
style=wx.DEFAULT_FRAME_STYLE,
name="DropTargetFrame"):
super(DropTargetFrame, self).__init__(parent, id,
title, pos,
size, style,
name)
# Attributes
choices = ["Drag and Drop Text or Files here",]
self.list = wx.ListBox(self,
choices=choices)
self.dt = FileAndTextDropTarget(self.OnFileDrop,
self.OnTextDrop)
self.list.SetDropTarget(self.dt)
# Setup
self.CreateStatusBar()
def OnFileDrop(self, files):
self.PushStatusText("Files Dropped")
for f in files:
self.list.Append(f)
def OnTextDrop(self, text):
self.PushStatusText("Text Dropped")
self.list.Append(text)
class FileAndTextDropTarget(wx.PyDropTarget):
"""Drop target capable of accepting dropped files and text"""
def __init__(self, file_callback, text_callback):
assert callable(file_callback)
assert callable(text_callback)
super(FileAndTextDropTarget, self).__init__()
# Attributes
self.fcallback = file_callback # Drop File Callback
self.tcallback = text_callback # Drop Text Callback
self._data = None
self.txtdo = None
self.filedo = None
# Setup
self.InitObjects()
def InitObjects(self):
"""Initializes the text and file data objects"""
self._data = wx.DataObjectComposite()
self.txtdo = wx.TextDataObject()
self.filedo = wx.FileDataObject()
self._data.Add(self.txtdo, False)
self._data.Add(self.filedo, True)
self.SetDataObject(self._data)
def OnData(self, x_cord, y_cord, drag_result):
"""Called by the framework when data is dropped on the target"""
if self.GetData():
data_format = self._data.GetReceivedFormat()
if data_format.GetType() == wx.DF_FILENAME:
self.fcallback(self.filedo.GetFilenames())
else:
self.tcallback(self.txtdo.GetText())
return drag_result