from wxPython.wx import * import images #---------------------------------------------------------------------- class DragShape: def __init__(self, bmp): self.bmp = bmp self.pos = wxPoint(0,0) self.shown = true self.text = None self.fullscreen = false def HitTest(self, pt): rect = self.GetRect() return rect.Inside(pt.x, pt.y) def GetRect(self): return wxRect(self.pos.x, self.pos.y, self.bmp.GetWidth(), self.bmp.GetHeight()) def Draw(self, dc, op = wxCOPY): if self.bmp.Ok(): memDC = wxMemoryDC() memDC.SelectObject(self.bmp) dc.Blit(self.pos.x, self.pos.y, self.bmp.GetWidth(), self.bmp.GetHeight(), memDC, 0, 0, op, true) return true else: return false #---------------------------------------------------------------------- class DragCanvas(wxScrolledWindow): def __init__(self, parent, ID): wxScrolledWindow.__init__(self, parent, ID) self.shapes = [] self.dragImage = None self.dragShape = None self.hiliteShape = None self.SetCursor(wxStockCursor(wxCURSOR_ARROW)) self.bg_bmp = images.getBackgroundBitmap() # Make a shape from an image and mask. This one will demo # dragging outside the window bmp = images.getTestStarBitmap() shape = DragShape(bmp) shape.pos = wxPoint(5, 5) shape.fullscreen = true self.shapes.append(shape) # Make a shape from some text text = "Some Text" font = wxFont(15, wxROMAN, wxNORMAL, wxBOLD) textExtent = self.GetFullTextExtent(text, font) bmp = wxEmptyBitmap(textExtent[0], textExtent[1]) dc = wxMemoryDC() dc.SelectObject(bmp) dc.Clear() dc.SetTextForeground(wxRED) dc.SetFont(font) dc.DrawText(text, 0, 0) dc.SelectObject(wxNullBitmap) del dc mask = wxMaskColour(bmp, wxWHITE) bmp.SetMask(mask) shape = DragShape(bmp) shape.pos = wxPoint(5, 100) shape.text = "Some dragging text" self.shapes.append(shape) # Make some shapes from some playing card images. x = 200 for card in ['_01c_', '_12h_', '_13d_', '_10s_']: bmpFunc = getattr(images, "get%sBitmap" % card) bmp = bmpFunc() shape = DragShape(bmp) shape.pos = wxPoint(x, 5) self.shapes.append(shape) x = x + 80 EVT_ERASE_BACKGROUND(self, self.OnEraseBackground) EVT_PAINT(self, self.OnPaint) EVT_LEFT_DOWN(self, self.OnLeftDown) EVT_LEFT_UP(self, self.OnLeftUp) EVT_MOTION(self, self.OnMotion) def TileBackground(self, dc): # tile the background bitmap sz = self.GetClientSize() w = self.bg_bmp.GetWidth() h = self.bg_bmp.GetHeight() x = 0 while x < sz.width: y = 0 while y < sz.height: dc.DrawBitmap(self.bg_bmp, x, y) y = y + h x = x + w def DrawShapes(self, dc): for shape in self.shapes: if shape.shown: shape.Draw(dc) def FindShape(self, pt): for shape in self.shapes: if shape.HitTest(pt): return shape return None def EraseShape(self, shape, dc): r = shape.GetRect() dc.SetClippingRegion(r.x, r.y, r.width, r.height) self.TileBackground(dc) self.DrawShapes(dc) dc.DestroyClippingRegion() def OnEraseBackground(self, evt): dc = evt.GetDC() if not dc: dc = wxClientDC(self) rect = self.GetUpdateRegion().GetBox() dc.SetClippingRegion(rect.x, rect.y, rect.width, rect.height) self.TileBackground(dc) def OnPaint(self, evt): dc = wxPaintDC(self) self.PrepareDC(dc) self.DrawShapes(dc) def OnLeftDown(self, evt): shape = self.FindShape(evt.GetPosition()) if shape: # get ready to start dragging, but wait for the user to # move it a bit first self.dragShape = shape self.dragStartPos = evt.GetPosition() def OnLeftUp(self, evt): if not self.dragImage or not self.dragShape: self.dragImage = None self.dragShape = None return # end the dragging self.dragImage.Hide() self.dragImage.EndDrag() self.dragImage = None dc = wxClientDC(self) if self.hiliteShape: self.hiliteShape.Draw(dc) self.hiliteShape = None # reposition and draw the shape self.dragShape.pos = self.dragShape.pos + evt.GetPosition() - self.dragStartPos self.dragShape.shown = true self.dragShape.Draw(dc) self.dragShape = None def OnMotion(self, evt): if not self.dragShape or not evt.Dragging() or not evt.LeftIsDown(): return # if we have a shape, but havn't started dragging yet if self.dragShape and not self.dragImage: # only start the drag after having moved a couple pixels tolerance = 2 pt = evt.GetPosition() dx = abs(pt.x - self.dragStartPos.x) dy = abs(pt.y - self.dragStartPos.y) if dx <= tolerance and dy <= tolerance: return # erase the shape since it will be drawn independently now dc = wxClientDC(self) self.dragShape.shown = false self.EraseShape(self.dragShape, dc) if self.dragShape.text: self.dragImage = wxDragString(self.dragShape.text, wxStockCursor(wxCURSOR_HAND)) else: self.dragImage = wxDragImage(self.dragShape.bmp, wxStockCursor(wxCURSOR_HAND)) hotspot = self.dragStartPos - self.dragShape.pos self.dragImage.BeginDrag(hotspot, self, self.dragShape.fullscreen) self.dragImage.Move(pt) self.dragImage.Show() # if we have shape and image then move it, posibly highlighting another shape. elif self.dragShape and self.dragImage: onShape = self.FindShape(evt.GetPosition()) unhiliteOld = false hiliteNew = false # figure out what to hilite and what to unhilite if self.hiliteShape: if onShape is None or self.hiliteShape is not onShape: unhiliteOld = true if onShape and onShape is not self.hiliteShape and onShape.shown: hiliteNew = TRUE # if needed, hide the drag image so we can update the window if unhiliteOld or hiliteNew: self.dragImage.Hide() if unhiliteOld: dc = wxClientDC(self) self.hiliteShape.Draw(dc) self.hiliteShape = None if hiliteNew: dc = wxClientDC(self) self.hiliteShape = onShape self.hiliteShape.Draw(dc, wxINVERT) # now move it and show it again if needed self.dragImage.Move(evt.GetPosition()) if unhiliteOld or hiliteNew: self.dragImage.Show() #---------------------------------------------------------------------- def runTest(frame, nb, log): win = DragCanvas(nb, -1) return win #---------------------------------------------------------------------- overview = """\ """