[Qt-interest] mouse buttons

[Frederic Tingaud]

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
>>
>>
>>
>> _______________________________________________
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>> 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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