On Thu, Jul 17, 2008 at 09:46:16AM +0200, David M. Kaplan wrote:
> I don't think the blocking code will be that hard to maintain. It
> basically just depends on events, callback functions and time.sleep. If
> those are cross-platform, then it shouldn't be a problem. But only time
> will tell. My ability and desire to test on multiple platforms is
> limited - I use ubuntu/gnome-gtk/linux 100%.
In addition to your patch you can put start/stop_event_loop
methods into the the canvas. That way backends can specialize
their implementation so they don't need a busy loop while waiting
for the event.
Then you can replace the termination notice in BlockingInput:
- self.done = True
+ self.fig.canvas.stop_event_loop()
and move the busy loop to the backend:
# wait for n clicks
- counter = 0
- while not self.done:
- self.fig.canvas.flush_events()
- time.sleep(0.01)
-
- # check for a timeout
- counter += 1
- if timeout > 0 and counter > timeout/0.01:
- print "ginput timeout";
- break;
+ self.fig.canvas.start_event_loop(timeout=timeout)
In backend_bases.py I have a generic interactive version
based on sleep:
class FigureCanvasBase:
...
def start_event_loop(self, timeout=0):
"""
Run the event loop.
This call blocks until an event callback triggers
stop_event_loop() or the timeout interval is exceeded.
"""
if timeout == 0: timeout = npy.inf
timestep = 0.01
counter = 0
self._looping = True
while self._looping and counter*timestep < timeout:
self.flush_events()
time.sleep(timestep)
counter += 1
def stop_event_loop(self):
"""
Stop the event loop.
The function which started the event loop can now run to completion.
"""
self._looping = False
In the wx canvas this is specialized as:
class FigureCanvasWx(FigureCanvasBase, wx.Panel):
...
def start_event_loop(self, timeout=0):
"""
Run the event loop.
This call blocks until an event callback triggers
stop_event_loop() or the timeout interval is exceeded.
"""
root = self.GetTopLevelParent()
bind(root, wx.EVT_CLOSE, self.stop_event_loop)
id = wx.NewId()
timer = wx.Timer(self, id=id)
if timeout > 0:
timer.Start(timeout*1000, oneShot=True)
bind(self, wx.EVT_TIMER, self.stop_event_loop, id=id)
self._event_loop.Run()
timer.Stop()
def stop_event_loop(self, event=None):
"""
Stop the event loop.
The function which started the event loop can now run to completion.
"""
if self._event_loop.IsRunning():
self._event_loop.Exit()
# Event binding code changed after version 2.5
if wx.VERSION_STRING >= '2.5':
def bind(actor,event,action,**kw):
actor.Bind(event,action,**kw)
else:
def bind(actor,event,action,id=None):
if id is not None:
event(actor, id, action)
else:
event(actor,action)
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