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| - | Wikipedia:
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| - | In computer graphical user interfaces, drag-and-drop is the action of (or support for the action of) clicking on a virtual object and dragging it to a different location or onto another virtual object. In general, it can be used to invoke many kinds of actions, or create various types of associations between two abstract objects.
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| - | Drag and drop functionality is one of the most visible aspects of the graphical user interface.
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| - | Drag and drop operation enables you to do complex things intuitively.
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| - | In drag and drop we basically drag some data from a data source to a data target. So we must have:
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| - | * Some data
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| - | * A data source
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| - | * A data target
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| - | In wxPython we have two predefined data targets. <b>wx.TextDropTarget</b> and <b>wx.FileDropTarget</b>.
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| - | __TOC__
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| - | === wx.TextDropTarget ===
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| - | [[image: wxPython_faq_dragdrop.png | center]]
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| - | <source lang="python">
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| - | #!/usr/bin/python
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| - | # dragdrop.py
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| - | import os
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| - | import wx
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| - | class MyTextDropTarget(wx.TextDropTarget):
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| - | def __init__(self, object):
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| - | wx.TextDropTarget.__init__(self)
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| - | self.object = object
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| - | def OnDropText(self, x, y, data):
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| - | self.object.InsertStringItem(0, data)
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| - | class DragDrop(wx.Frame):
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| - | def __init__(self, parent, id, title):
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| - | wx.Frame.__init__(self, parent, id, title, size=(650, 500))
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| - | splitter1 = wx.SplitterWindow(self, -1, style=wx.SP_3D)
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| - | splitter2 = wx.SplitterWindow(splitter1, -1, style=wx.SP_3D)
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| - | self.dir = wx.GenericDirCtrl(splitter1, -1, dir='/home/', style=wx.DIRCTRL_DIR_ONLY)
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| - | self.lc1 = wx.ListCtrl(splitter2, -1, style=wx.LC_LIST)
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| - | self.lc2 = wx.ListCtrl(splitter2, -1, style=wx.LC_LIST)
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| - | dt = MyTextDropTarget(self.lc2)
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| - | self.lc2.SetDropTarget(dt)
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| - | self.Bind(wx.EVT_LIST_BEGIN_DRAG, self.OnDragInit, id=self.lc1.GetId())
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| - | tree = self.dir.GetTreeCtrl()
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| - | splitter2.SplitHorizontally(self.lc1, self.lc2)
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| - | splitter1.SplitVertically(self.dir, splitter2)
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| - | self.Bind(wx.EVT_TREE_SEL_CHANGED, self.OnSelect, id=tree.GetId())
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| - | self.OnSelect(0)
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| - | self.Centre()
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| - | self.Show(True)
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| - | def OnSelect(self, event):
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| - | list = os.listdir(self.dir.GetPath())
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| - | self.lc1.ClearAll()
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| - | self.lc2.ClearAll()
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| - | for i in range(len(list)):
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| - | if list[i][0] != '.':
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| - | self.lc1.InsertStringItem(0, list[i])
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| - | def OnDragInit(self, event):
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| - | text = self.lc1.GetItemText(event.GetIndex())
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| - | tdo = wx.TextDataObject(text)
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| - | tds = wx.DropSource(self.lc1)
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| - | tds.SetData(tdo)
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| - | tds.DoDragDrop(True)
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| - | app = wx.App()
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| - | DragDrop(None, -1, 'dragdrop.py')
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| - | app.MainLoop()
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| - | </source>
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| - | === wx.FileDropTarget ===
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| - | One of the advantages of the GUI over the console is it's intuitiveness. You can learn a GUI program easier than a console application. You often do not need a manual. On the other hand, some graphical operations are too complex. For example, deleting a file by dragging it and droping it to the trash basket is very intuitive and easy to understand, but actually most people just press the delete key. (shift + delete) It is more effective. In our next example we explore a graphical operation, that is very handy. In most GUI text editors, you can open a file by simply dragging it from the file manager and dropping it on the editor.
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| - | <source lang="python">
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| - | #!/usr/bin/python
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| - | # filedrop.py
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| - | import wx
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| - | class FileDrop(wx.FileDropTarget):
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| - | def __init__(self, window):
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| - | wx.FileDropTarget.__init__(self)
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| - | self.window = window
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| - | def OnDropFiles(self, x, y, filenames):
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| - | for name in filenames:
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| - | try:
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| - | file = open(name, 'r')
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| - | text = file.read()
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| - | self.window.WriteText(text)
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| - | file.close()
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| - | except IOError, error:
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| - | dlg = wx.MessageDialog(None, 'Error opening file\n' + str(error))
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| - | dlg.ShowModal()
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| - | except UnicodeDecodeError, error:
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| - | dlg = wx.MessageDialog(None, 'Cannot open non ascii files\n' + str(error))
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| - | dlg.ShowModal()
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| - | class DropFile(wx.Frame):
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| - | def __init__(self, parent, id, title):
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| - | wx.Frame.__init__(self, parent, id, title, size = (450, 400))
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| - | self.text = wx.TextCtrl(self, -1, style = wx.TE_MULTILINE)
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| - | dt = FileDrop(self.text)
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| - | self.text.SetDropTarget(dt)
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| - | self.Centre()
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| - | self.Show(True)
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| - | app = wx.App()
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| - | DropFile(None, -1, 'filedrop.py')
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| - | app.MainLoop()
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| - | </source>
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| - | [[Категория:wxWidgets]]
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| - | [[Категория:Python]]
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