2008/12/2 Darren Dale <dsdale24@…149…>
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?
Ahh, I hadn’t considered this problem. It arises because I am using
mpl location events to trigger the figure enter event. The solution
is to use the gui event for the figure enter event too – basically
the gui needs to call the canvas.enter_notify_event. I added your
patch and modified gtk to handle the enter_notify_event in svn r6468.
Can you update, repatch wx to use it (and Darren qt)?
This is done for qt and qt4. In qt, if you hold the button, leave the figure, enter the second figure, and release the button, the old figure receives the leave event, but the new figure does not receive the enter event. This seems like an issue with qt3, the new figure does receive the enter event with qt4.
with the patched wx backend I observe the same behaviour. The second figure does not recieve an enter event. This might be because the wx backend captures the mouse if a button is pressed, i.e., all mouse events are redirected to the first figure.
I noticed that if one moves the cursor rapidly through the figure and axes, some events are not captured. For example, the cursor is in an axes but the last event the axes received was a leave event. I’m not sure how that could be improved, do you see it as well?
Exactly this behaviour I can’t see with the wx backend. Did I understood correctly: You manage to place the mouse within an axis, without having received a enter event?
With all backends (Wx, GTK, Qt) I manage to leave the figure, without leaving an axis. Either I move very fast, or I stack the figures on screen so that I can leave an axis without touching the space around. We could emit axes_leave_events (to all axes of the figure, or do we keep record which axes has been entered recently?) before emitting a figure_leave_event, or leave this to the users implementation of the figure_leave_event callback. The first solution might lead to a lot of undesired redraws of the figure when leaving the figure if several axes are contained in the figure and each leave_axes callback issues a redraw, like in the example.
On Tue, Dec 2, 2008 at 10:41 AM, John Hunter <jdh2358@…149…> wrote:
On Tue, Dec 2, 2008 at 8:34 AM, Gregor Thalhammer > > > > <gregor.thalhammer@…149…> wrote: