Mouse event problem

[cheyanne]

how can i get the coordinates feedback if i click the left button on my qgraphicscene.

void MainWindow::mousePressEvent(QMouseEvent *event)
{
    if(event->button() ==  Qt::LeftButton )
   {
       //im not sure what code i should put in here
    }
}

void MainWindow::mousePressEvent(QMouseEvent *event)
{
    if(event->button() ==  Qt::LeftButton )
   {
       //im not sure what code i should put in here
    }
}

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[Lykurg]

What's about QMouseEvent::globalPos() and QMouseEvent::pos()?

[cheyanne]

im able to get the coordinates from the mainwindow, which mean (0,0) is at the top left of the mainwindow, how do i set (0,0) at the top left of my qgraphicsview?

[Lykurg]

then see QWidget::mapTo() or QWidget::mapFrom().

[cheyanne]

i cant get it, you have any source codes as reference ?? how about you tell me if i can enable mouse event only in my qgraphicsview?

[Lykurg]

Only because today it is Christmas eve! (normally it shouldn't be a problem for you, to write a small demo app, where you can play around.)

#include <QtGui>
 
class Main : public QWidget
{
    Q_OBJECT
public:
    Main(QWidget *parent = 0) : QWidget(parent) {
        m_green = new QWidget(this);
        QPalette p = m_green->palette();
        p.setColor(QPalette::Window, Qt::green);
        m_green->setPalette(p);
        m_green->setAutoFillBackground(true);
        m_green->setMinimumSize(50, 50);
 
        QHBoxLayout *l = new QHBoxLayout;
        l->addWidget(m_green);
        l->setContentsMargins(100, 100, 100, 100);
        setLayout(l);
    }
    virtual ~Main() {}
protected:
    void mousePressEvent(QMouseEvent *e) {
        qWarning() << Q_FUNC_INFO;
        qWarning() << "  pos:" << e->pos();
        qWarning() << " gpos:" << e->globalPos();
        qWarning() << "child:"
                   << m_green->mapFromParent(e->pos())
                   << m_green->mapFromGlobal(e->globalPos())
                   << m_green->mapFrom(this, e->pos());
    }
private:
    QWidget *m_green;
};
 
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    Main w;
    w.show();
 
    return a.exec();
}
 
#include "main.moc"

#include <QtGui>

class Main : public QWidget
{
    Q_OBJECT
public:
    Main(QWidget *parent = 0) : QWidget(parent) {
        m_green = new QWidget(this);
        QPalette p = m_green->palette();
        p.setColor(QPalette::Window, Qt::green);
        m_green->setPalette(p);
        m_green->setAutoFillBackground(true);
        m_green->setMinimumSize(50, 50);

        QHBoxLayout *l = new QHBoxLayout;
        l->addWidget(m_green);
        l->setContentsMargins(100, 100, 100, 100);
        setLayout(l);
    }
    virtual ~Main() {}
protected:
    void mousePressEvent(QMouseEvent *e) {
        qWarning() << Q_FUNC_INFO;
        qWarning() << "  pos:" << e->pos();
        qWarning() << " gpos:" << e->globalPos();
        qWarning() << "child:"
                   << m_green->mapFromParent(e->pos())
                   << m_green->mapFromGlobal(e->globalPos())
                   << m_green->mapFrom(this, e->pos());
    }
private:
    QWidget *m_green;
};


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    Main w;
    w.show();

    return a.exec();
}

#include "main.moc"

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[cheyanne]

thanks how about mouseevent only in qgraphicsview? not anywhere else. Can this be done ?

[Lykurg]

yes, but you will find out yourself... By reading the documentation.

[cheyanne]

Do I use mouse area?