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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.InsideXY(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"
bg_colour = wxColour(57, 115, 57) # matches the bg image
font = wxFont(15, wxROMAN, wxNORMAL, wxBOLD)
textExtent = self.GetFullTextExtent(text, font)
bmp = wxEmptyBitmap(textExtent[0], textExtent[1])
dc = wxMemoryDC()
dc.SelectObject(bmp)
dc.SetBackground(wxBrush(bg_colour, wxSOLID))
dc.Clear()
dc.SetTextForeground(wxRED)
dc.SetFont(font)
dc.DrawText(text, 0, 0)
dc.SelectObject(wxNullBitmap)
mask = wxMaskColour(bmp, bg_colour)
bmp.SetMask(mask)
shape = DragShape(bmp)
shape.pos = wxPoint(5, 100)
shape.text = "Some dragging text"
self.shapes.append(shape)
bmp = images.getTheKidBitmap()
shape = DragShape(bmp)
shape.pos = wxPoint(200, 5)
self.shapes.append(shape)
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)
EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
def OnLeaveWindow(self, evt):
pass
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 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 = 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 = wxPanel(nb, -1)
canvas = DragCanvas(win, -1)
def onSize(evt, panel=win, canvas=canvas): canvas.SetSize(panel.GetSize())
EVT_SIZE(win, onSize)
return win
#----------------------------------------------------------------------
overview = """\
"""
if __name__ == '__main__':
import sys,os
import run
run.main(['', os.path.basename(sys.argv[0])])
|
