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I would like to be able to intercept QGIS panels (QDockWidgets) closings.

I read the API online help but i don't clearly understand it.Is there any usable close signal linked with dockWidgets?

In a next step i would like to implement my own QDockWidgets with their own behaviour but ... how can i achieve this for existing integrated QGIS panels?

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    Have you tried the visibilityChanged or destroyed signal for your purposes? doc.qt.io/archives/qt-4.8/qdockwidget.html Also, what QGIS and Qt version? – Spacedman Apr 11 '18 at 13:31
  • I am on QGIS 2.18 so far. visibilityChanged seems to fit my needs. destroyed signal doesn't seem to give anything ... – snaileater Apr 11 '18 at 19:21
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Are you trying to do so from the Python console, or are you actually working on QGIS source code?

In any case, QDockWidget does not emit a signal when closing. You should write your own class, derived from QDockWidget, and reimplement the closeEvent method, which is called whenever the widget is closed.

From there, you can emit a custom signal, if you need to notify the close event to the outside world.

  • yeah that's what i feared ... and no similar signal or inherited one ? does that mean there is nothing to do with the existing QGIS panels ? Maybe replace them with my customized one ? My aim is to develop a plug-in but i make some tests in the console. Thanks – snaileater Apr 11 '18 at 10:59
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    Not that I'm aware of. But if you already have a pointer to that panel you can check its status with the visible() property. – Sergio Monteleone Apr 11 '18 at 12:51
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As S Monteleone pointed out there's no direct signal emitted by a QDockWidget when it's closed. However, there's still a close event fired. This means you can install a Qt event filter on the widget which intercepts close events and emits it's own signal to indicate that the dock was closed.

You'll need to do some reading on event filters - they are quite a powerful concept in Qt.

  • Thanks ! i'll work on this ... i'm playing with the visibilityChanged signal so far since destroyed signal doesn't seem to give anything visible ... – snaileater Apr 11 '18 at 19:18

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