How to get mouse double click event from only the title of QGroupBox?

[abdoemr11]

Hi
I had a QGroupBox and I wanted to do some action when I double click on it, However I want to restrict the area of interaction to only the title of QGroupBox not his body nor the widget inside it. Is there an easy way to achive that?

[JoeCFD]

Override mouseevent in subclass of qgroupbox and check the position of the mouse event. If it is inside title area, do your thing. Otherwise, nothing.

[eyllanesc]

@abdoemr11 Demo:

#include <QApplication>
#include <QGroupBox>
#include <QRadioButton>
#include <QVBoxLayout>
#include <QStyle>
#include <QMouseEvent>
#include <QStyleOptionGroupBox>

#include <QDebug>

class GroupBox: public QGroupBox{
public:
    using QGroupBox::QGroupBox;
protected:
    void mouseDoubleClickEvent(QMouseEvent *event){
        QGroupBox::mouseDoubleClickEvent(event);
        QStyleOptionGroupBox box;
        initStyleOption(&box);
        QStyle::SubControl sc = style()->hitTestComplexControl(QStyle::CC_GroupBox, &box, event->pos(), this);
        if(sc & QStyle::SC_GroupBoxLabel){
            qDebug() << "clicked" << title();
        }
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    GroupBox groupBox("Exclusive Radio Buttons");

    QRadioButton *radio1 = new QRadioButton("Radio button 1");
    QRadioButton *radio2 = new QRadioButton("Radio button 2");
    QRadioButton *radio3 = new QRadioButton("Radio button 3");

    radio1->setChecked(true);

    QVBoxLayout *vbox = new QVBoxLayout;
    vbox->addWidget(radio1);
    vbox->addWidget(radio2);
    vbox->addWidget(radio3);
    vbox->addStretch(1);
    groupBox.setLayout(vbox);

    groupBox.show();

    return a.exec();
}

[JonB]

@eyllanesc said in How to get mouse double click event from only the title of QGroupBox?:

QStyle::SubControl sc = style()->hitTestComplexControl(QStyle::CC_GroupBox, &box, event->pos(), this);

Interesting, I had not heard of QStyle::hitTestComplexControl().

However the docs there state "Note that the position is expressed in screen coordinates." But QMouseEvent::pos() says "Returns the position of the mouse cursor, relative to the widget that received the event." Is there not an issue here using event->pos()?

[eyllanesc]

@JonB Maybe it is a bug in the docs, I have used this method several times in other applications. And if you check the mousePressEvent method of QGroupBox you will see that it uses it in the same way that I did

[JonB]

@eyllanesc said in How to get mouse double click event from only the title of QGroupBox?:

I have used this method several times in other applications.

Then that's fine. I had wondered whether event->globalPos() might have been necessary. Maybe I misunderstand the docs anyway, I take "screen coordinates" to mean "relative to screen" but maybe that's not the same thing as "(0,0) is top-left of screen".

It's still a nice method to avoid having to figure out what is where on a widget oneself!

[abdoemr11]

@eyllanesc Thanks man your solution is elegant. Thx again