John Hunter schrieb:
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
I attached a patch for the wx backend. Nearly everything has already
been implemented. Instead of the new 'leave_notify_event' leaving the
figure triggered a fake motion_event. I changed this.
If a mouse button is pressed while leaving the figure the behaviour is
somewhat strange. First, a figure_leave_event is emitted. Then, further
moving the mouse outside the figure a new figure_enter_event is created.
This is the case since all mouse events, also movements outside the
window, are captured as long as a mouse button is pressed. This is a
very convenient behaviour for panning/zooming. However, when finally
releasing the mouse button no figure_leave_event is triggered. With the
GTK backend such an event is created.
So what should be the desired behaviour?
Gregor
Index: backend_wx.py
===================================================================
--- backend_wx.py (revision 6465)
+++ backend_wx.py (working copy)
@@ -1263,10 +1263,10 @@
FigureCanvasBase.motion_notify_event(self, x, y, guiEvent=evt)
def _onLeave(self, evt):
- """Mouse has left the window; fake a motion event."""
+ """Mouse has left the window."""
evt.Skip()
- FigureCanvasBase.motion_notify_event(self, -1, -1, guiEvent=evt)
+ FigureCanvasBase.leave_notify_event(self, guiEvent = evt)
########################################################################
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