utils/wxPython/demo/DragAndDrop.py

   1
   2 from wxPython.wx import *
   3
   4 #----------------------------------------------------------------------
   5
   6 class ClipTextPanel(wxPanel):
   7     def __init__(self, parent, log):
   8         wxPanel.__init__(self, parent, -1)
   9         self.log = log
  10
  11         #self.SetFont(wxFont(10, wxSWISS, wxNORMAL, wxBOLD, false))
  12
  13         sizer = wxBoxSizer(wxVERTICAL)
  14         sizer.Add(wxStaticText(self, -1,
  15                                "Copy/Paste text to/from\n"
  16                                "this window and other apps"), 0, wxEXPAND|wxALL, 2)
  17
  18         self.text = wxTextCtrl(self, -1, "", style=wxTE_MULTILINE|wxHSCROLL)
  19         sizer.Add(self.text, 1, wxEXPAND)
  20
  21         hsz = wxBoxSizer(wxHORIZONTAL)
  22         hsz.Add(wxButton(self, 6050, " Copy "), 1, wxEXPAND|wxALL, 2)
  23         hsz.Add(wxButton(self, 6051, " Paste "), 1, wxEXPAND|wxALL, 2)
  24         sizer.Add(hsz, 0, wxEXPAND)
  25         sizer.Add(wxButton(self, 6052, " Copy Bitmap "), 0, wxEXPAND|wxALL, 2)
  26
  27         EVT_BUTTON(self, 6050, self.OnCopy)
  28         EVT_BUTTON(self, 6051, self.OnPaste)
  29         EVT_BUTTON(self, 6052, self.OnCopyBitmap)
  30
  31         self.SetAutoLayout(true)
  32         self.SetSizer(sizer)
  33
  34
  35     def OnCopy(self, evt):
  36         self.do = wxTextDataObject()
  37         self.do.SetText(self.text.GetValue())
  38         wxTheClipboard.Open()
  39         wxTheClipboard.SetData(self.do)
  40         wxTheClipboard.Close()
  41
  42
  43     def OnPaste(self, evt):
  44         do = wxTextDataObject()
  45         wxTheClipboard.Open()
  46         success = wxTheClipboard.GetData(do)
  47         wxTheClipboard.Close()
  48         if success:
  49             self.text.SetValue(do.GetText())
  50         else:
  51             wxMessageBox("There is no data in the clipboard in the required format",
  52                          "Error")
  53
  54     def OnCopyBitmap(self, evt):
  55         dlg = wxFileDialog(self, "Choose a bitmap to copy", wildcard="*.bmp")
  56         if dlg.ShowModal() == wxID_OK:
  57             bmp = wxBitmap(dlg.GetFilename(), wxBITMAP_TYPE_BMP)
  58             bmpdo = wxBitmapDataObject(bmp)
  59             wxTheClipboard.Open()
  60             wxTheClipboard.SetData(bmpdo)
  61             wxTheClipboard.Close()
  62
  63             wxMessageBox("The bitmap is now in the Clipboard.  Switch to a graphics\n"
  64                          "editor and try pasting it in...")
  65         dlg.Destroy()
  66
  67 #----------------------------------------------------------------------
  68
  69 class OtherDropTarget(wxPyDropTarget):
  70     def __init__(self, window, log):
  71         wxPyDropTarget.__init__(self)
  72         self.log = log
  73         self.do = wxFileDataObject()
  74         self.SetDataObject(self.do)
  75
  76     def OnEnter(self, x, y, d):
  77         self.log.WriteText("OnEnter: %d, %d, %d\n" % (x, y, d))
  78         return wxDragCopy
  79
  80     #def OnDragOver(self, x, y, d):
  81     #    self.log.WriteText("OnDragOver: %d, %d, %d\n" % (x, y, d))
  82     #    return wxDragCopy
  83
  84     def OnLeave(self):
  85         self.log.WriteText("OnLeave\n")
  86
  87     def OnDrop(self, x, y):
  88         self.log.WriteText("OnDrop: %d %d\n" % (x, y))
  89         return true
  90
  91     def OnData(self, x, y, d):
  92         self.log.WriteText("OnData: %d, %d, %d\n" % (x, y, d))
  93         self.GetData()
  94         self.log.WriteText("%s\n" % self.do.GetFilenames())
  95         return d
  96
  97
  98
  99
 100 class MyFileDropTarget(wxFileDropTarget):
 101     def __init__(self, window, log):
 102         wxFileDropTarget.__init__(self)
 103         self.window = window
 104         self.log = log
 105
 106     def OnDropFiles(self, x, y, filenames):
 107         self.window.SetInsertionPointEnd()
 108         self.window.WriteText("\n%d file(s) dropped at %d,%d:\n" %
 109                               (len(filenames), x, y))
 110         for file in filenames:
 111             self.window.WriteText(file + '\n')
 112
 113
 114
 115 class FileDropPanel(wxPanel):
 116     def __init__(self, parent, log):
 117         wxPanel.__init__(self, parent, -1)
 118
 119         #self.SetFont(wxFont(10, wxSWISS, wxNORMAL, wxBOLD, false))
 120
 121         sizer = wxBoxSizer(wxVERTICAL)
 122         sizer.Add(wxStaticText(self, -1, " \nDrag some files here:"),
 123                   0, wxEXPAND|wxALL, 2)
 124
 125         self.text = wxTextCtrl(self, -1, "",
 126                                style = wxTE_MULTILINE|wxHSCROLL|wxTE_READONLY)
 127         dt = MyFileDropTarget(self, log)
 128         self.text.SetDropTarget(dt)
 129         sizer.Add(self.text, 1, wxEXPAND)
 130
 131         self.SetAutoLayout(true)
 132         self.SetSizer(sizer)
 133
 134
 135     def WriteText(self, text):
 136         self.text.WriteText(text)
 137
 138     def SetInsertionPointEnd(self):
 139         self.text.SetInsertionPointEnd()
 140
 141
 142 #----------------------------------------------------------------------
 143 #----------------------------------------------------------------------
 144
 145 class TestPanel(wxPanel):
 146     def __init__(self, parent, log):
 147         wxPanel.__init__(self, parent, -1)
 148
 149         self.SetAutoLayout(true)
 150         outsideSizer = wxBoxSizer(wxVERTICAL)
 151
 152         msg = "Clipboard / Drag-And-Drop"
 153         text = wxStaticText(self, -1, "", style=wxALIGN_CENTRE)
 154         text.SetFont(wxFont(24, wxSWISS, wxNORMAL, wxBOLD, false))
 155         text.SetLabel(msg)
 156         w,h = text.GetTextExtent(msg)
 157         text.SetSize(wxSize(w,h+1))
 158         text.SetForegroundColour(wxBLUE)
 159         outsideSizer.Add(text, 0, wxEXPAND|wxALL, 5)
 160         outsideSizer.Add(wxStaticLine(self, -1), 0, wxEXPAND)
 161
 162         inSizer = wxBoxSizer(wxHORIZONTAL)
 163         inSizer.Add(ClipTextPanel(self, log), 1, wxEXPAND)
 164         inSizer.Add(FileDropPanel(self, log), 1, wxEXPAND)
 165
 166         outsideSizer.Add(inSizer, 1, wxEXPAND)
 167         self.SetSizer(outsideSizer)
 168
 169
 170 #----------------------------------------------------------------------
 171
 172 def runTest(frame, nb, log):
 173     win = TestPanel(nb, log)
 174     return win
 175
 176 #----------------------------------------------------------------------
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189 overview = """\
 190 This demo shows some examples of data transfer through clipboard or drag and drop. In wxWindows, these two ways to transfer data (either between different applications or inside one and the same) are very similar which allows to implement both of them using almost the same code - or, in other words, if you implement drag and drop support for your application, you get clipboard support for free and vice versa.
 191
 192 At the heart of both clipboard and drag and drop operations lies the wxDataObject class. The objects of this class (or, to be precise, classes derived from it) represent the data which is being carried by the mouse during drag and drop operation or copied to or pasted from the clipboard. wxDataObject is a "smart" piece of data because it knows which formats it supports (see GetFormatCount and GetAllFormats) and knows how to render itself in any of them (see GetDataHere). It can also receive its value from the outside in a format it supports if it implements the SetData method. Please see the documentation of this class for more details.
 193
 194 Both clipboard and drag and drop operations have two sides: the source and target, the data provider and the data receiver. These which may be in the same application and even the same window when, for example, you drag some text from one position to another in a word processor. Let us describe what each of them should do.
 195
 196 """