from wxPython.wx import * import cPickle #---------------------------------------------------------------------- class DoodlePad(wxWindow): def __init__(self, parent, log): wxWindow.__init__(self, parent, -1, style=wxSUNKEN_BORDER) self.log = log self.SetBackgroundColour(wxWHITE) self.lines = [] self.x = self.y = 0 self.SetCursor(wxStockCursor(wxCURSOR_PENCIL)) EVT_LEFT_DOWN(self, self.OnLeftDown) EVT_LEFT_UP(self, self.OnLeftUp) EVT_RIGHT_UP(self, self.OnRightUp) EVT_MOTION(self, self.OnMotion) def OnPaint(self, event): dc = wxPaintDC(self) self.DrawSavedLines(dc) def DrawSavedLines(self, dc): dc.BeginDrawing() dc.SetPen(wxPen(wxBLUE, 3)) for line in self.lines: for coords in line: apply(dc.DrawLine, coords) dc.EndDrawing() def OnLeftDown(self, event): if event.ControlDown(): self.StartDragOpperation() else: self.curLine = [] self.x, self.y = event.GetPositionTuple() self.CaptureMouse() def OnLeftUp(self, event): self.lines.append(self.curLine) self.curLine = [] self.ReleaseMouse() def OnRightUp(self, event): self.lines = [] self.Refresh() def OnMotion(self, event): if event.Dragging() and not event.ControlDown(): dc = wxClientDC(self) dc.BeginDrawing() dc.SetPen(wxPen(wxBLUE, 3)) coords = (self.x, self.y) + event.GetPositionTuple() self.curLine.append(coords) apply(dc.DrawLine, coords) self.x, self.y = event.GetPositionTuple() dc.EndDrawing() def StartDragOpperation(self): # pickle the lines list linesdata = cPickle.dumps(self.lines, 1) # create our own data format and use it in a # custom data object ldata = wxCustomDataObject(wxCustomDataFormat("DoodleLines")) ldata.SetData(linesdata) # Also create a Bitmap version of the drawing size = self.GetSize() bmp = wxEmptyBitmap(size.width, size.height) dc = wxMemoryDC() dc.SelectObject(bmp) dc.SetBackground(wxWHITE_BRUSH) dc.Clear() self.DrawSavedLines(dc) dc.SelectObject(wxNullBitmap) # Now make a data object for the bitmap and also a composite # data object holding both of the others. bdata = wxBitmapDataObject(bmp) data = wxDataObjectComposite() data.Add(ldata) data.Add(bdata) # And finally, create the drop source and begin the drag # and drop opperation dropSource = wxDropSource(self) dropSource.SetData(data) self.log.WriteText("Begining DragDrop\n") result = dropSource.DoDragDrop() self.log.WriteText("DragDrop completed: %d\n" % result) #---------------------------------------------------------------------- class DoodleDropTarget(wxPyDropTarget): def __init__(self, window, log): wxPyDropTarget.__init__(self) self.log = log self.dv = window self.data = wxCustomDataObject(wxCustomDataFormat("DoodleLines")) self.SetDataObject(self.data) def OnEnter(self, x, y, d): self.log.WriteText("OnEnter: %d, %d, %d\n" % (x, y, d)) return wxDragCopy def OnLeave(self): self.log.WriteText("OnLeave\n") def OnDrop(self, x, y): self.log.WriteText("OnDrop: %d %d\n" % (x, y)) return true def OnData(self, x, y, d): self.log.WriteText("OnData: %d, %d, %d\n" % (x, y, d)) if self.GetData(): linesdata = self.data.GetData() lines = cPickle.loads(linesdata) self.dv.SetLines(lines) return d #def OnDragOver(self, x, y, d): # self.log.WriteText("OnDragOver: %d, %d, %d\n" % (x, y, d)) # return wxDragCopy class DoodleViewer(wxWindow): def __init__(self, parent, log): wxWindow.__init__(self, parent, -1, style=wxSUNKEN_BORDER) self.log = log self.SetBackgroundColour(wxWHITE) self.lines = [] self.x = self.y = 0 dt = DoodleDropTarget(self, log) self.SetDropTarget(dt) def SetLines(self, lines): self.lines = lines self.Refresh() def OnPaint(self, event): dc = wxPaintDC(self) self.DrawSavedLines(dc) def DrawSavedLines(self, dc): dc.BeginDrawing() dc.SetPen(wxPen(wxRED, 3)) for line in self.lines: for coords in line: apply(dc.DrawLine, coords) dc.EndDrawing() #---------------------------------------------------------------------- class CustomDnDPanel(wxPanel): def __init__(self, parent, log): wxPanel.__init__(self, parent, -1) self.SetFont(wxFont(10, wxSWISS, wxNORMAL, wxBOLD, false)) sizer = wxBoxSizer(wxHORIZONTAL) text = wxStaticText(self, -1, "Draw a little picture in this window\n" "then Ctrl-Drag it to the lower \n" "window or to another application\n" "that accepts BMP's as a drop target.\n\n" "The lower window is accepting a\n" "custom data type that is a pickled\n" "Python list of lines data.") sizer.Add(text, 1, wxALL, 10) insizer = wxBoxSizer(wxVERTICAL) insizer.Add(DoodlePad(self, log), 1, wxEXPAND|wxALL, 5) insizer.Add(DoodleViewer(self, log), 1, wxEXPAND|wxALL, 5) sizer.Add(insizer, 1, wxEXPAND) self.SetAutoLayout(true) self.SetSizer(sizer) #---------------------------------------------------------------------- #---------------------------------------------------------------------- class TestPanel(wxPanel): def __init__(self, parent, log): wxPanel.__init__(self, parent, -1) self.SetAutoLayout(true) sizer = wxBoxSizer(wxVERTICAL) msg = "Custom Drag-And-Drop" text = wxStaticText(self, -1, "", style=wxALIGN_CENTRE) text.SetFont(wxFont(24, wxSWISS, wxNORMAL, wxBOLD, false)) text.SetLabel(msg) w,h = text.GetTextExtent(msg) text.SetSize(wxSize(w,h+1)) text.SetForegroundColour(wxBLUE) sizer.Add(text, 0, wxEXPAND|wxALL, 5) sizer.Add(wxStaticLine(self, -1), 0, wxEXPAND) sizer.Add(CustomDnDPanel(self, log), 1, wxEXPAND) self.SetSizer(sizer) #---------------------------------------------------------------------- def runTest(frame, nb, log): win = TestPanel(nb, log) return win if __name__ == '__main__': import sys class DummyLog: def WriteText(self, text): sys.stdout.write(text) class TestApp(wxApp): def OnInit(self): self.MakeFrame() return true def MakeFrame(self, event=None): frame = wxFrame(None, -1, "Custom Drag and Drop", size=(550,400)) menu = wxMenu() menu.Append(6543, "Window") mb = wxMenuBar() mb.Append(menu, "New") frame.SetMenuBar(mb) EVT_MENU(frame, 6543, self.MakeFrame) panel = TestPanel(frame, DummyLog()) frame.Show(true) self.SetTopWindow(frame) app = TestApp(0) app.MainLoop() #---------------------------------------------------------------------- overview = """\ This demo shows Drag and Drop using a custom data type and a custom data object. A type called "DoodleLines" is created and a Python Pickle of a list is actually transfered in the drag and drop opperation. A second data object is also created containing a bitmap of the image and is made available to any drop target that accepts bitmaps, such as MS Word. The two data objects are combined in a wxDataObjectComposite and the rest is handled by the framework. """