[Qt-interest] mouse buttons

[Zaid Amir]

Have you tried installing an event filter. It would filter any event related
to the QObject that you install it to. You should check the QT documentation
on how to implement an eventFilter.

Regards

-----Original Message-----
From: Frederic Tingaud [mailto:tingaud at gostai.com] 
Sent: Tuesday, March 23, 2010 2:41 PM
To: Erik Kruyt
Cc: z.alamir at genie-soft.com; qt-interest at trolltech.com
Subject: Re: [Qt-interest] mouse buttons

Erik Kruyt a écrit :
> 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
>>
>>
>>
>> _______________________________________________
>> Qt-interest mailing list
>> Qt-interest at trolltech.com
>> http://lists.trolltech.com/mailman/listinfo/qt-interest
>>     
>
>
>
> _______________________________________________
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>   
If you don't have the double click events, is it not because you forgot
to pass the event to QTreeWidget::mousePressEvent() at the end of your
ProjectFrame::mousePressEvent() ?

Otherwise, you need to use a timer when entering mousePressEvent and
compare result to qApp->doubleClickInterval.

-- 
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Frederic TINGAUD

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