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Cope with destruction of the window

This commit is contained in:
Guido van Rossum 1998-10-24 14:03:48 +00:00
parent c62cf36e76
commit a96c2d407b
1 changed files with 24 additions and 7 deletions
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31
Tools/idle/turtle.py
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@ -210,12 +210,16 @@ class RawPen:
arrow="last",
capstyle="round",
fill=self._color)
for i in range(1, 1+nhops):
x, y = x0 + dx*i/nhops, y0 + dy*i/nhops
self._canvas.coords(item, x0, y0, x, y)
self._canvas.update()
self._canvas.after(10)
self._canvas.itemconfigure(item, arrow="none")
try:
for i in range(1, 1+nhops):
x, y = x0 + dx*i/nhops, y0 + dy*i/nhops
self._canvas.coords(item, x0, y0, x, y)
self._canvas.update()
self._canvas.after(10)
self._canvas.itemconfigure(item, arrow="none")
except Tk.TclError:
# Probably the window was closed!
return
else:
item = self._canvas.create_line(x0, y0, x1, y1,
width=self._width,
@ -226,6 +230,7 @@ class RawPen:
_root = None
_canvas = None
_pen = None
class Pen(RawPen):
@ -233,13 +238,25 @@ class Pen(RawPen):
global _root, _canvas
if _root is None:
_root = Tk.Tk()
_root.wm_protocol("WM_DELETE_WINDOW", self.destroy)
if _canvas is None:
# XXX Should have scroll bars
_canvas = Tk.Canvas(_root, background="white")
_canvas.pack(expand=1, fill="both")
RawPen.__init__(self, _canvas)
_pen = None
def destroy(self):
global _root, _canvas, _pen
self.clear()
if self is _pen:
_pen = None
root = _root; _root = None
canvas = _canvas; _canvas = None
if root:
try:
root.destroy()
except Tk.TclError:
pass
def _getpen():
global _pen