--- /dev/null
+# 11/15/2003 - Jeff Grimmett (grimmtooth@softhome.net)
+#
+# o Updated for wx namespace
+#
+
+import wx
+import images
+
+#----------------------------------------------------------------------
+
+class DragShape:
+ def __init__(self, bmp):
+ self.bmp = bmp
+ self.pos = (0,0)
+ self.shown = True
+ self.text = None
+ self.fullscreen = False
+
+ def HitTest(self, pt):
+ rect = self.GetRect()
+ return rect.InsideXY(pt.x, pt.y)
+
+ def GetRect(self):
+ return wx.Rect(self.pos[0], self.pos[1],
+ self.bmp.GetWidth(), self.bmp.GetHeight())
+
+ def Draw(self, dc, op = wx.COPY):
+ if self.bmp.Ok():
+ memDC = wx.MemoryDC()
+ memDC.SelectObject(self.bmp)
+
+ dc.Blit((self.pos[0], self.pos[1]),
+ (self.bmp.GetWidth(), self.bmp.GetHeight()),
+ memDC, (0, 0), op, True)
+
+ return True
+ else:
+ return False
+
+
+
+#----------------------------------------------------------------------
+
+class DragCanvas(wx.ScrolledWindow):
+ def __init__(self, parent, ID):
+ wx.ScrolledWindow.__init__(self, parent, ID)
+ self.shapes = []
+ self.dragImage = None
+ self.dragShape = None
+ self.hiliteShape = None
+
+ self.SetCursor(wx.StockCursor(wx.CURSOR_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 = (5, 5)
+ shape.fullscreen = True
+ self.shapes.append(shape)
+
+ # Make a shape from some text
+ text = "Some Text"
+ bg_colour = wx.Colour(57, 115, 57) # matches the bg image
+ font = wx.Font(15, wx.ROMAN, wx.NORMAL, wx.BOLD)
+ textExtent = self.GetFullTextExtent(text, font)
+
+ # create a bitmap the same size as our text
+ bmp = wx.EmptyBitmap(textExtent[0], textExtent[1])
+
+ # 'draw' the text onto the bitmap
+ dc = wx.MemoryDC()
+ dc.SelectObject(bmp)
+ dc.SetBackground(wx.Brush(bg_colour, wx.SOLID))
+ dc.Clear()
+ dc.SetTextForeground(wx.RED)
+ dc.SetFont(font)
+ dc.DrawText(text, (0, 0))
+ dc.SelectObject(wx.NullBitmap)
+ mask = wx.MaskColour(bmp, bg_colour)
+ bmp.SetMask(mask)
+ shape = DragShape(bmp)
+ shape.pos = (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 = (x, 5)
+ self.shapes.append(shape)
+ x = x + 80
+
+
+ self.Bind(wx.EVT_ERASE_BACKGROUND, self.OnEraseBackground)
+ self.Bind(wx.EVT_PAINT, self.OnPaint)
+ self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
+ self.Bind(wx.EVT_LEFT_UP, self.OnLeftUp)
+ self.Bind(wx.EVT_MOTION, self.OnMotion)
+ self.Bind(wx.EVT_LEAVE_WINDOW, self.OnLeaveWindow)
+
+
+ # We're not doing anything here, but you might have reason to.
+ # for example, if you were dragging something, you might elect to
+ # 'drop it' when the cursor left the window.
+ def OnLeaveWindow(self, evt):
+ pass
+
+
+ # tile the background bitmap
+ def TileBackground(self, dc):
+ 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
+
+
+ # Go through our list of shapes and draw them in whatever place they are.
+ def DrawShapes(self, dc):
+ for shape in self.shapes:
+ if shape.shown:
+ shape.Draw(dc)
+
+ # This is actually a sophisticated 'hit test', but in this
+ # case we're also determining which shape, if any, was 'hit'.
+ def FindShape(self, pt):
+ for shape in self.shapes:
+ if shape.HitTest(pt):
+ return shape
+ return None
+
+ # Remove a shape from the display
+ def EraseShape(self, shape, dc):
+ r = shape.GetRect()
+ dc.SetClippingRect(r)
+ self.TileBackground(dc)
+ self.DrawShapes(dc)
+ dc.DestroyClippingRegion()
+
+ # Clears the background, then redraws it. If the DC is passed, then
+ # we only do so in the area so designated. Otherwise, it's the whole thing.
+ def OnEraseBackground(self, evt):
+ dc = evt.GetDC()
+
+ if not dc:
+ dc = wxClientDC(self)
+ rect = self.GetUpdateRegion().GetBox()
+ dc.SetClippingRect(rect)
+ self.TileBackground(dc)
+
+ # Fired whenever a paint event occurs
+ def OnPaint(self, evt):
+ dc = wx.PaintDC(self)
+ self.PrepareDC(dc)
+ self.DrawShapes(dc)
+
+ # Left mouse button is down.
+ def OnLeftDown(self, evt):
+ # Did the mouse go down on one of our shapes?
+ shape = self.FindShape(evt.GetPosition())
+
+ # If a shape was 'hit', then set that as the shape we're going to
+ # drag around. Get our start position. Dragging has not yet started.
+ # That will happen once the mouse moves, OR the mouse is released.
+ if shape:
+ self.dragShape = shape
+ self.dragStartPos = evt.GetPosition()
+
+ # Left mouse button up.
+ def OnLeftUp(self, evt):
+ if not self.dragImage or not self.dragShape:
+ self.dragImage = None
+ self.dragShape = None
+ return
+
+ # Hide the image, end dragging, and nuke out the drag image.
+ self.dragImage.Hide()
+ self.dragImage.EndDrag()
+ self.dragImage = None
+
+ dc = wx.ClientDC(self)
+
+ if self.hiliteShape:
+ self.hiliteShape.Draw(dc)
+ self.hiliteShape = None
+
+ # reposition and draw the shape
+
+ # Note by jmg 11/28/03
+ # Here's the original:
+ #
+ # self.dragShape.pos = self.dragShape.pos + evt.GetPosition() - self.dragStartPos
+ #
+ # So if there are any problems associated with this, use that as
+ # a starting place in your investigation. I've tried to simulate the
+ # wx.Point __add__ method here -- it won't work for tuples as we
+ # have now from the various methods
+ #
+ # There must be a better way to do this :-)
+ #
+
+ self.dragShape.pos = (
+ self.dragShape.pos[0] + evt.GetPosition()[0] - self.dragStartPos[0],
+ self.dragShape.pos[1] + evt.GetPosition()[1] - self.dragStartPos[1]
+ )
+
+ self.dragShape.shown = True
+ self.dragShape.Draw(dc)
+ self.dragShape = None
+
+ # The mouse is moving
+ def OnMotion(self, evt):
+ # Ignore mouse movement if we're not dragging.
+ if not self.dragShape or not evt.Dragging() or not evt.LeftIsDown():
+ return
+
+ # if we have a shape, but haven'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 = wx.ClientDC(self)
+ self.dragShape.shown = False
+ self.EraseShape(self.dragShape, dc)
+
+
+ if self.dragShape.text:
+ self.dragImage = wx.DragString(self.dragShape.text,
+ wx.StockCursor(wx.CURSOR_HAND))
+ else:
+ self.dragImage = wx.DragImage(self.dragShape.bmp,
+ wx.StockCursor(wx.CURSOR_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 = wx.ClientDC(self)
+ self.hiliteShape.Draw(dc)
+ self.hiliteShape = None
+
+ if hiliteNew:
+ dc = wx.ClientDC(self)
+ self.hiliteShape = onShape
+ self.hiliteShape.Draw(dc, wx.INVERT)
+
+ # 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 = wx.Panel(nb, -1)
+ canvas = DragCanvas(win, -1)
+
+ def onSize(evt, panel=win, canvas=canvas):
+ canvas.SetSize(panel.GetSize())
+
+ win.Bind(wx.EVT_SIZE, onSize)
+ return win
+
+#----------------------------------------------------------------------
+
+
+
+overview = """\
+DragImage is used when you wish to drag an object on the screen, and a simple
+cursor is not enough.
+
+On Windows, the WIN32 API is used to do achieve smooth dragging. On other
+platforms, <code>GenericDragImage</code> is used. Applications may also prefer to use
+<code>GenericDragImage</code> on Windows, too.
+
+<b>wxPython note</b>: wxPython uses <code>GenericDragImage</code> on all
+platforms, but uses the <code>DragImage</code> name.
+
+To use this class, when you wish to start dragging an image, create a
+<code>DragImage</code> object and store it somewhere you can access it as the
+drag progresses. Call BeginDrag to start, and EndDrag to stop the drag. To move
+the image, initially call Show and then Move. If you wish to update the screen
+contents during the drag (for example, highlight an item as in the example), first
+call Hide, update the screen, call Move, and then call Show.
+
+You can drag within one window, or you can use full-screen dragging either across
+the whole screen, or just restricted to one area of the screen to save resources.
+If you want the user to drag between two windows, then you will need to use
+full-screen dragging.
+
+"""
+
+
+if __name__ == '__main__':
+ import sys,os
+ import run
+ run.main(['', os.path.basename(sys.argv[0])])
+
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