def OnPaint(self):
if not self._win_paint_broken:
try:
win = self._win
dc, ps = win.BeginPaint()
try:
win_update_rect = ps[2]
if not empty_rect(win_update_rect):
#print "DrawableContainer.OnPaint: win_update_rect =", win_update_rect ###
scroll_offset = self._win_scroll_offset()
view_update_rect = offset_rect(win_update_rect, scroll_offset)
if self._double_buffer:
dx, dy = rect_topleft(view_update_rect)
width, height = rect_size(view_update_rect)
buffer = gdi.Bitmap(width, height)
canvas = Canvas._from_win_image(buffer)
canvas.translate(-dx, -dy)
self.draw(canvas, view_update_rect)
graphics = gdi.Graphics.from_dc(dc)
src_rect = (0, 0, width, height)
graphics.DrawImage_rr(buffer, win_update_rect, src_rect)
else:
self._win_prepare_dc(dc)
canvas = Canvas._from_win_dc(dc)
self.draw(canvas, view_update_rect)
finally:
win.EndPaint(ps)
except Exception:
self._win_paint_broken = True
raise
def OnPaint(self):
if not self._win_paint_broken:
try:
win = self._win
dc, ps = win.BeginPaint()
try:
win_update_rect = ps[2]
if not empty_rect(win_update_rect):
#print "DrawableContainer.OnPaint: win_update_rect =", win_update_rect ###
scroll_offset = self._win_scroll_offset()
view_update_rect = offset_rect(win_update_rect,
scroll_offset)
if self._double_buffer:
dx, dy = rect_topleft(view_update_rect)
width, height = rect_size(view_update_rect)
#GDIPlus draw large image in very bad performance
#use GDI instead
#buffer = gdi.Bitmap(width, height)
#canvas = Canvas._from_win_image(buffer)
#canvas.translate(-dx, -dy)
#self.draw(canvas, view_update_rect)
#graphics = gdi.Graphics.from_dc(dc)
#src_rect = (0, 0, width, height)
#graphics.DrawImage_rr(buffer, win_update_rect, src_rect)
c_dc = dc.CreateCompatibleDC(dc)
c_dm = ui.CreateBitmap()
c_dm.CreateCompatibleBitmap(dc, width, height)
old = c_dc.SelectObject(c_dm)
c_dc.SetViewportOrg((-dx, -dy))
canvas = Canvas._from_win_dc(c_dc)
self.draw(canvas, view_update_rect)
l, t = rect_topleft(win_update_rect)
dc.BitBlt((l, t), (width, height), c_dc, (0, 0),
win32con.SRCCOPY)
c_dc.SelectObject(old)
else:
self._win_prepare_dc(dc)
canvas = Canvas._from_win_dc(dc)
self.draw(canvas, view_update_rect)
finally:
win.EndPaint(ps)
except Exception:
self._win_paint_broken = True
raise
def invalidate_frame(self, rect):
# Below is a logic to invalidate just the frame, not the whole rect.
# This is to fight flicker. A better fix is to use double buffering.
# If fixed, all of this could be just: self.invalidate_rect(rect)
w, h = rect_size(rect)
topleft = rect_topleft(rect)
topright = add_pt(topleft, (w-1, 0))
botleft = add_pt(topleft, (0, h-1))
self.invalidate_rect(rect_sized(topleft, (1, h)))
self.invalidate_rect(rect_sized(topleft, (w, 1)))
self.invalidate_rect(rect_sized(topright, (1, h)))
self.invalidate_rect(rect_sized(botleft, (w, 1)))
