[Qt-interest] mouse buttons

[Erik Kruyt]

This is just what I tried and described in the first place (at the bottom).

For a mouse click or enter the mousePressEvent method is invoked and I can
discriminate between left and right button correctly.

However, the mouseDoubleClickEvent method is not entered when double
clicked. At double clicking the mousePressEvent method is invoked and not
the mouseDoubleClickEvent. I don't see how I know it was a double click. The
event is QMouseEvent and the button is Qt::LeftButton.

The documentation is a mystery for me:
============================================================================
======
void QWidget::mouseDoubleClickEvent (QMouseEvent * event)   [virtual
protected]
This event handler, for event event, can be reimplemented in a subclass to
receive mouse double click events for the widget.

The default implementation generates a normal mouse press event. ?????

Note: The widget will also receive mouse press and mouse release events in
addition to the double click event. It is up to the developer to ensure that
the application interprets these events correctly.  ?????

See also mousePressEvent(), mouseReleaseEvent(), mouseMoveEvent(), event(),
and QMouseEvent.
============================================================================
=====

So the problem remains: how do I catch the double click?.

Erik

> -----Oorspronkelijk bericht-----
> Van: qt-interest-bounces at trolltech.com [mailto:qt-interest-
> bounces at trolltech.com] Namens Zaid Amir
> Verzonden: dinsdag 23 maart 2010 8:07
> Aan: qt-interest at trolltech.com
> Onderwerp: Re: [Qt-interest] mouse buttons
> 
> Hi
> 
> To monitor mouse events you could use the mousePressEvent,
> mouseReleaseEvent
> and mouseMoveEvent which are virtual functions that, when implemented
> in
> your class, immediately capture all the desired mouse events so that
> you can
> do whatever you want with them. You can filter the event even more by
> specifying different functionality for left, middle and right-click
> events.
> You could do this by checking the type of the QMouseEvent as such:
> 
> mousePressEvent ( QMouseEvent * event )
> {
> 	If(event->button() == Qt::MouseButton::LeftButton)
> 		//Do something
> 	Else if (event->button() == Qt::MouseButton::RightButton)
> 		//Do Something Different
> 
> }
> 
> 
> And since QTreeWidget is actually a QObject you could install and event
> filter for that item. Check the part for eventFilter in the
> documentation
> for details and examples on how to use and install an event filter.
> 
> Regards
> 
> Zaid Amir
> 
> Date: Mon, 22 Mar 2010 18:30:30 +0100
> From: "Erik Kruyt" <erik at forcheck.nl>
> Subject: [Qt-interest] mouse buttons
> To: <qt-interest at trolltech.com>
> Message-ID: <009f01cac9e5$5edd5de0$1c9819a0$@nl>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> I want to react differently on a right, left and double mouse button
> click
> in a QTreeWidget.
> 
> QTreeWidget only provides an itemClicked and an itemDoubleclicked
> signal.
> 
> How can I detect if the itemclicked signal was caused by the right or a
> left
> mouse button?
> 
> 
> 
> The documentation of QTreeWidget does not give an answer.
> 
> The documentation of QAbstractItemView::pressed states that you can
> obtain
> the state of the mouse buttons through QApplication::mouseButtons().
> This is
> a static function. I tried this but no buttons are reported to be
> pressed!
> 
> Example of the slot receiving the itemClicked signal:
> 
> 
> 
> void ProjectFrame::itemClicked(QTreeWidgetItem *item, int column)
> 
> {
> 
>     if (column == 0){
> 
>         itemSelected(item);
> 
>         Qt::MouseButtons buttons = QApplication::mouseButtons();
> 
>         if (buttons.testFlag(Qt::RightButton)){
> 
>             popUpMenu->exec(QCursor::pos());
> 
>         }
> 
>     }
> 
> }
> 
> 
> 
> As an alternative I tried to re?mplement mousePressEvent. Now I can
> discriminate between right and left button. However, now I cannot
> discriminate the double mouse click, because the double click starts
> the
> mouseClickEvent instead of the mouseDoubleClickEvent! Moreover, now I
> have
> to implement the item selection and deselections anew.
> 
> 
> 
> So the question is: how can I retrieve the mousebutton clicked in the
> itemClicked signal?
> 
> 
> 
> Erik Kruyt
> 
> 
> 
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