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Hi John,
John Hunter wrote:
> On Wed, Nov 26, 2008 at 11:57 AM, Egor Zindy <ez...@gm...> wrote:
>
> 
>> thank you, I'll have to check out the repository to see how I can use the
>> changes.
>>
>> Just a thought: a figure_leave / figure_enter event could be triggered by
>> comparing the currently held axis with event.inaxes (that's what Slider and
>> my bar widget do in _update() ).
>> 
>
> That's exactly how its done. The problem I referred to above (which
> will not affect your use case since you are leaving the axes) occurs
> when you want to connect to a figure leave event and move your mouse
> to a non-mpl window. Then we get no events to compare to the prior.
>
> JDH
> 
The new version attached that fixes a few of the things I was unhappy about:
* radius for clicking the bar now in pixels
* case when mouse pointer is outside the graph now handled correctly.
* commented the methods a bit more (still working on that)
Both these rely on the following two functions:
 #convert from x to xdata
 print self.ax.transData.inverted().transform_point((event.x, event.y))
 #convert from xdata to x
 print self.ax.transData.transform_point((event.xdata, event.ydata))
event.x always returns a value, so I used that to "fix" xdata when the 
cursor is outside the graph
Things I have struggled with (this time):
* there is a toobar.set_cursor() but no toolbar.get_cursor() which would 
be interesting to have to set the cursor back to what it should be 
(rather than arbitrary POINTER type).
* more cursor types would be nice (could do with size_ver and size_hor 
in 
http://wiki.openusability.org/guidelines/index.php/Design_and_Layout:Visual_Design:Cursors).
* took a long time to check out matplotlib from SVN, have yet to check 
the new events out.
* a nice name? (been struggling with that a lot lately!) Is "Bar" OK? or 
maybe "SelectionBar"?
Regards,
Egor

I can have a look at the qt backends, maybe this weekend.
On Wed, Nov 26, 2008 at 2:05 PM, John Hunter <jd...@gm...> wrote:
> I recently added support for a figure/axes enter/leave event. The
> figure enter and axes enter/leave are easy to do with nothing new in
> the backends, just using the native mpl events. The figure leave
> event is harder, because when a user leaves a figure and activates
> another window, mpl gets no events.
>
> To correct this, I added a leave_notify_event method to
> backend_bases.FigureCanvasBase (note this is not an mpl Event) but
> when called it will trigger a callback to those registered to the
> figure_leave_event with the last event that occurred in the window.
>
> I added support for this in gtk by connecting the the gtk signal
> 'leave_notify_event' to the mpl backend method leave_notify_event. If
> you know something about tk, wx or qt event handling, could you add a
> similar method to the appropriate backend? You can follow the example
> in backend_gtk.
>
>
> You can test with examples/event_handling/figure_axes_enter_leave.py
>
> Thanks,
> JDH
>
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