Question

I’ve got a QComboBox with a custom list object.

The custom list object has a custom mousePressEvent so that when the user click on one of the circles with a +/- (a twisty), the list is expanded/collapsed.

When I use the list with the combo box, when the user clicks on a twisty, the list is expanded/collapsed, but the selection is changed, and the list is hidden. How can I filter this so that when the user click on a twisty, the selection is not changed, and the list not hidden.

Additional screenshots

All of the nodes collapsed:

List hidden:

Answer 1

QT has a eventFilter that ‘captures’ QEvent.MouseButtonRelease. So what I have done is installed my own eventFilter that filters QEvent.MouseButtonRelease events if the user click on a node.

In my list object I have the following method:

def mousePressEvent (self, e):     self.colapse_expand_click = False     if <user clicked node>:         colapse_expand_node()         e.accept ()         self.colapse_expand_click = True 

The mousePressEvent runs before mouseReleaseEvent.

Then in the custom combobox, I filter the event:

class RevisionSelectorWidget(QtGui.QComboBox):     def __init__(self, parent = None):         QtGui.QComboBox.__init__(self, parent)          self.log_list = RevisionSelectorLogList(self)         self.setView(self.log_list)         self.log_list.installEventFilter(self)         self.log_list.viewport().installEventFilter(self)      def eventFilter(self, object, event):         if event.type() == QtCore.QEvent.MouseButtonRelease:             if self.log_list.colapse_expand_click:                 return True         return False