<![CDATA[Mouse tracking on QGraphicsView]]>Hello!

I have a class derivated of QGraphicsView. I had to enable the mouse tracking property because I have to get the mouse position coordinates. Now, the problem is that when I move the mouse on the QGraphicsView, I can move the image inside "without clicking it".

How could I disable this first click?

]]>https://forum.qt.io/topic/78628/mouse-tracking-on-qgraphicsviewRSS for NodeSat, 11 Apr 2026 01:25:55 GMTWed, 26 Apr 2017 08:10:52 GMT60<![CDATA[Reply to Mouse tracking on QGraphicsView on Mon, 05 Jun 2017 07:22:06 GMT]]>@dheerendra Yes, exactly, this is my problem. Thank you for translate my question haha.

]]>https://forum.qt.io/post/397304https://forum.qt.io/post/397304Mon, 05 Jun 2017 07:22:06 GMT<![CDATA[Reply to Mouse tracking on QGraphicsView on Fri, 02 Jun 2017 14:02:06 GMT]]>Let me rephrase your question. You have QGraphicsView & inside the You have image with GraphicsItem. Based on the mouse click you would like to move the image. Since you have enabled mouse tracking, without clicking also image is moving. Is that the correct problem statement ?
If yes, you would like do something like, without first click image should not move. Is that correct ?

]]>https://forum.qt.io/post/397027https://forum.qt.io/post/397027Fri, 02 Jun 2017 14:02:06 GMT<![CDATA[Reply to Mouse tracking on QGraphicsView on Fri, 02 Jun 2017 11:57:20 GMT]]>@dheerendra This is my code section:

    /* MODO POR DEFECTO (ZOOM) ****************************************************************************** */
    if (graphicMode == ZOOM_MODE) {
    //if (sceneMode == NoMode) {
        QPointF pos = this->mapToScene(event->pos());
        int _posX = pos.x();
        int _posY = pos.y();
        if (this->hasMouseTracking() && !item->pixmap().isNull()) {
            if (_posX >= 0 && _posX <= this->imageData.cols && _posY >= 0 && _posY <= this->imageData.rows)
                if (analysisMode)
                    emit sendPos(this->mapToScene(event->pos()), this->imageTemp.ptr<double>(_posY)[_posX]);/************/
                else emit sendPos(this->mapToScene(event->pos()), asignaTemperatura(C1*(double)this->imageData.ptr<short>(event->pos().y())[event->pos().x()] + C0, 1, tabla_L_T1));
            else {
                QPoint badPos(-1,-1);
                emit sendPos(badPos, -1);
            }
        }
        if (_pan)
        {
            horizontalScrollBar()->setValue(horizontalScrollBar()->value() - (event->x() - _panStartX));
            verticalScrollBar()->setValue(verticalScrollBar()->value() - (event->y() - _panStartY));
            _panStartX = event->x();
            _panStartY = event->y();
            event->accept();
            return;
        }

        event->ignore();
    }

Thank you very much!

]]>https://forum.qt.io/post/396998https://forum.qt.io/post/396998Fri, 02 Jun 2017 11:57:20 GMT<![CDATA[Reply to Mouse tracking on QGraphicsView on Wed, 26 Apr 2017 12:45:23 GMT]]>If image moves means u must be setting image coordinates with mouse move coordinates. Can u paste the sample code ?

]]>https://forum.qt.io/post/390067https://forum.qt.io/post/390067Wed, 26 Apr 2017 12:45:23 GMT<![CDATA[Reply to Mouse tracking on QGraphicsView on Wed, 26 Apr 2017 11:30:07 GMT]]>Thank you very much for answer me but this fix doesn't work. The problem is: at first, when I move the mouse, the image moves too, but, when I click the image, the movement stops, and I want to stop the movement always.

]]>https://forum.qt.io/post/390055https://forum.qt.io/post/390055Wed, 26 Apr 2017 11:30:07 GMT<![CDATA[Reply to Mouse tracking on QGraphicsView on Wed, 26 Apr 2017 11:26:32 GMT]]>@ivanicy

Try setting to false,l setflag()

setFlag(QGraphicsItem::ItemIsMovable, false);
]]>https://forum.qt.io/post/390050https://forum.qt.io/post/390050Wed, 26 Apr 2017 11:26:32 GMT