On Thu, Jun 17, 2010 at 11:04 PM, David Smith <davidhsmith...@gmail.com> wrote:
> I have been developing an application using PyQt ant Matplotlib and
> encountered
> a problem with the mouse cursor shape being incorrect. I found a work-around
> that seems to work, but I think this is a bug and the fix needs to go into the
> Matplotlib code base. Here are details.
>
> My application has a central widget used fo r a Matplotlib Figure.
> Additionally there is a menu bar, button bar and two dock panels with
> controls for the plot. I see the following behavior for the cursor:
>
> * On start up, the cursor acts normally on startup provided
> the mouse cursor is not inside the figure widget on start-up.
>
> * Mouse pointer shapes are set by Windows (in this case VISTA)
> and change shape according to location. For example, touching
> the application window's border results in the arrow pointer
> changing shape to a double-headed arrow indicating the border
> can be dragged to adjust the size of the window.
>
> * Once the mouse pointer touches the Matplotlib figure widget
> in any way, the mouse pointer will cease to show the double-arrow
> shape on the window borders - the pointer remains an arrowhead.
> You can still resize the window and the cursor does change to
> a double-arrow when you press the left button.
>
> My workaround for this was to add the following lines of code in my
> application:
>
> def onleave(self):
> QtGui.QApplication.restoreOverrideCursor()
>
> self.fig.canvas.mpl_connect('figure_leave_event', onleave)
>
> I guessed these lines by studying the matplotlib code. Probably they
> need to go somewhere inside the Matplotlib class definitions.
>
> I hope this helps developers to correct this problem. My application
> code is medium-large and I didn't try to build a smaller example. The
> mysterious 3-line workaround solves my problem for the moment.
> Perhaps it will help another PyQt and Matplotlib user and perhaps
> urge developers to fix the problem in the Matplotlib core.
Now that you mention it, I have seen similar behavior. Thanks for the
report, I'll look into it.
Darren
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