Re: wx.lib.agw.aui.AuiNotebook => Tab drag/drop bug

Hmm, I have some code that does mouse capture, and I couldn't get
HasCapture to work either (written maybe 10 years ago???  never re-examined
it).  I just added a "self.captured" state, changing it explicitly when I
capture and release, then added an event handler to change the state when I
don't get that explicit enter/leave event.  I suspect HasCapture is missing
something like this?

>>> self.Bind(wx.EVT_MOUSE_CAPTURE_LOST, self.OnCaptureLost)


On Thu, Nov 24, 2016 at 9:48 AM, Harald Hanöfner <[email protected]> wrote:

> If you want drag-and-drop a tab of a wx.lib.agw.aui.AuiNotebook the
> application hangs after releasing the left mouse and the following error
> message occurs.
> (Environment: Python 3.5.2 | wxPython_Phoenix-3.0.3.
> dev2680+55dda48-cp35-cp35m-win32.whl | Windows 10)
>
> Traceback (most recent call last):
>   File "C:\Program Files (x86)\Python 3.5\lib\site-packages\wx\lib\
> agw\aui\auibook.py", line 2023, in OnLeftUp
>     self.ReleaseMouse()
> wx._core.wxAssertionError: C++ assertion "!wxMouseCapture::stack.empty()"
> failed at ..\..\src\common\wincmn.cpp(3319) in wxWindowBase::ReleaseMouse
> (): Releasing mouse capture but capture stack empty?
>
> When I look into the code I see the following there:
>
> 2022            if self.HasCapture():
> 2023                self.ReleaseMouse()
>
> Very surprising, because the mouse releasing is checked before the call!?
> I have no idea why that exception raised. With python 2.7 and wxPython
> 3.0.2.0 this code makes no problems.
>
> A similar problem I have sometimes when I move the whole application
> window. Then I get the following error message.
>
> Traceback (most recent call last):
>   File "C:\Program Files (x86)\Python 3.5\lib\site-packages\wx\lib\
> agw\aui\framemanager.py", line 9219, in OnLeftUp
>     self._frame.ReleaseMouse()
> wx._core.wxAssertionError: C++ assertion "!wxMouseCapture::stack.empty()"
> failed at ..\..\src\common\wincmn.cpp(3319) in wxWindowBase::ReleaseMouse
> (): Releasing mouse capture but capture stack empty?
>
> But that error only appears very seldom and not predictable. But the
> problem is the same as above => with calling the method ReleaseMouse()
> despite of a previous HasCapture() check.
>
> Hope somebody can help me. Thanks!
>
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