<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">2016-06-17 13:16 GMT+02:00 Andrea Borsic <span dir="ltr"><<a href="mailto:aborsic@ne-scientific.com" target="_blank">aborsic@ne-scientific.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>In C++, a callback can return "true" to stop event
propagation:</div>
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<div> // Description:</div>
<div> // This method invokes an event and return whether the
event was</div>
<div> // aborted or not. If the event was aborted, the return
value is 1,</div>
<div> // otherwise it is 0.</div>
<div> int InvokeEvent(unsigned long event, void *callData);</div>
<div> int InvokeEvent(unsigned long event);</div>
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<div>When this feature was added for C++, it wasn't added to
vtkPythonCommand.cxx (an oversight), so vtkPythonCommand.cxx
would have to be modified to add this behavior for Python.</div>
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<div>Regarding calldata, see the following merge request (now
merged):</div>
<div><a href="https://gitlab.kitware.com/vtk/vtk/merge_requests/1543/commits" target="_blank">https://gitlab.kitware.com/vtk/vtk/merge_requests/1543/commits</a><br>
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<div>If Hasting happens to be reading this, please note that
commit messages should be a wee bit more descriptive...</div>
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<div>I can't say much about the rest. The interactors aren't
my favorite part of VTK.</div>
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<div>I'm also curious, if you don't mind me asking: Have you
used a lot of PyQt+VTK? If so, did you use the interactor
style system or did you forego using it completely?<br>
<br>
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<div>Elvis<br>
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<div> - David</div>
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Hi Elvis,<br>
<br>
I am not entirely sure this answer is relevant. One can customize
the response to particular events in this way:<br>
<br>
1) by registering a call back command with a higher priority w.r.t.
to default observers, with a statement like:<br>
<br>
cmd_id = interactor.AddObserver("LeftButtonPressEvent",
self.MouseButtonCallback, 0.5) # use a priority of 0.5 which should
be higher than default observers (0.0)<br>
<br>
2) by inspecting / acting on the event within the call back command,
and if further processing of the event by other observers (for
example the default interactor) needs to be prevented, by using
something like:<br>
<br>
command = interactor.GetCommand(cmd_id)<br>
command.SetAbortFlag(1)<br>
<br>
the above should stop any further handling of the event.<br>
<br>
This is therefore a possible way of overriding the default behavior
of the interactor associated with render window.<br>
<br>
I am not entirely sure though whether this was the behavior your
were looking for.<br></div></blockquote><div><br></div><div>Thanks a lot. I think in a way this is as close as I'm going to get to what I wanted, but for one thing: I wanted to be able to modify the event (say the x/y of a mouse event) before "passing it on" for further processing, which I don't think is possible.<br><br></div><div>But I think I've realized now that this is probably a bad way of anchieving my goal, and I'm not working on a completely custom interactor style instead (using vtkInteractorStyleUser).<br><br></div><div>Elvis<br></div><div> <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div bgcolor="#FFFFFF" text="#000000">
<br>
Best,<br>
<br>
Andrea<br>
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