[PyQt] How can I capture some mouse events but ignore others?

[Marc Nations]

On Fri, Mar 6, 2009 at 12:05 PM, Jim Bublitz <jbublitz at nwinternet.com>wrote:

> - Show quoted text -
> On Friday 06 March 2009 09:06:03 am Andreas Pakulat wrote:
> > On 06.03.09 08:40:17, Jim Bublitz wrote:
> > > On Friday 06 March 2009 06:53:01 am Marc Nations wrote:
> > > > Hi,
> > > > I'm trying to create a custom table which pops up a menu when the
> > > > user right clicks. This part works ok. It looks like this:
> > > >
> > > > class Table(QtGui.QTableWidget):
> > > >     def __init__(self, parent,  gui):
> > > >         QtGui.QTableWidget.__init__(self, parent)
> > > >         self.gui = gui
> > > >
> > > >     def mouseReleaseEvent(self, event):
> > > >         if event.button() == QtCore.Qt.RightButton:
> > > >             self.rightClickMenu(event)
> > > >
> > > >
> > > >     def rightClickMenu(self,  event):
> > > >         pos = event.pos
> > > >         self.gui.ui.menuEdit.popup(QtGui.QCursor.pos())
> > > >
> > > >
> > > > The problem is that the default before of left click is changed,
> > > > and I can't reset it. Without the mods the left clicks acts where
> > > > if a multiple selection is made then clicking on another table
> > > > cell de-selects all the previous items (unless a modifier key is
> > > > used). With the above method, once multiple selections are made
> > > > then it basically goes into <shift> mode and all previous
> > > > selections are kept. I can't figure out a way to turn that off.
> > > >
> > > > Is there a way to cherry pick which mouse events you want and
> > > > ignore the rest, basically letting them keep their default
> > > > behavior? Because it looks like once the function is taken over
> > > > then the default behaviors are lost.
> > >
> > > Look at QWidget.contextMenuEvent - it catches only right clicks.
> > > Overload that.
> > >
> > > If you want to grab those on the vertical or horizontal headers, I
> > > think you'll have to install an event filter on the respective
> > > QHeaderViews (QObject.installEventFilter) and grab only
> > > QContextMenuEvents for those objects.
> >
> > The header views are qwidgets as well, so I don't see why that would
> > be necessary.
>
> Because you'd have to subclass them and replace the QTableWidget's
> original headers. It seems easier to install an event filter, but
> either method would work.
>
> > Apart from that, its even possible without overriding any base class,
> > using QWidget.setContextMenuPolicy (set to Qt.CustomContextMenu) and
> > catching the customContextMenuRequested() signal from the same
> > widget.
>
> That's probably easier than installing an event filter - wasn't aware of
> that.
>
> Jim
>


Got it working. Here's the code for posterity:


        tableWidget.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
        QtCore.QObject.connect(tableWidget,
QtCore.SIGNAL("customContextMenuRequested(QPoint)"), self.contextMenu)

    def contextMenu(self,  event):
        self.gui.ui.menuEdit.popup(QtGui.QCursor.pos())


Deceptively simple, but solves both problems. I don't have to sub-class the
Table Widget, and I can simply borrow a menu I created with Qt Designer and
not have to add it all in manually. Awesome.

Thanks for all the help.
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