Mouse cursor over QWidget

[bunjee]

Greeting Qt community,

I'm looking for a way to maintain a "cursor hovered" property.

Even when the mouse is pressed or when a window overlaps my QWidget.

Is there a way to check if the cursor is inside a visible part of my QWidget ?

Thanks ♥.

B.A.

[mcosta]

Hi,

you can use setMouseTracking() to enable mouse tracking and implement mouseMoveEvent() to check mouse position.
For example

@
void MyWidget::mouseMoveEvent(QMouseEvent *_event)
{
if (this->rect().contains(_event->pos())) {
// Mouse over Widget
}
else {
// Mouse out of Widget
}
}
@

[jsprenkle]

There's already a css property for hovered. If you're just using it to change the appearance of the widget you can use that without doing any coding.

[jazzycamel]

Another way is to install an event filter and look for the enter and leave events, a trivial example:

@
#include <QtGui>
#include <QtCore>

class Widget : public QWidget {
public:
Widget(QWidget *parent=0) : QWidget(parent) {
installEventFilter(this);

    QVBoxLayout *l=new QVBoxLayout(this);
    label=new QLabel("(Default)", this);
    l->addWidget(label);
}

protected:
bool eventFilter(QObject *object, QEvent *event){
if(object==this && (event->type()==QEvent::Enter || event->type()==QEvent::Leave))
label->setText(event->type()==QEvent::Enter ? "Hovering" : "Not Hovering");
}

private:
QLabel *label;
};

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();

return a.exec();

}
@

[Timmmm]

[quote author="mcosta" date="1365013118"]Hi,

you can use setMouseTracking() to enable mouse tracking and implement mouseMoveEvent() to check mouse position.
@[/quote]

This doesn't work because mouseMoveEvent() isn't called unless the cursor is inside the widget, so your if() condition is always true!

You can theoretically use grabMouse() but I feel like that is a potentially bad way to do what should be fairly simple.

[Timmmm]

-Here is some better code:- See below
@
class MyWidget : public QWidget
{
// ...
protected:
bool event(QEvent* e) override;
// ...
};

bool MyWidget::event(QEvent* e)
{
if (e->type() == QEvent::Enter)
qDebug() << "Enter"; // Or whatever
if (e->type()==QEvent::Leave)
qDebug() << "Leave";

return QWidget::event(e); // Or whatever parent class you have.
}@

Actually screw that - there are already leaveEvent() and enterEvent() functions in QWidget!