QMouseEvent on button click

mrjj

@uruloke
you have to add

protected:
void mousePressEvent(QMouseEvent *eventPress);

to mainwindow .H
and
void mousePressEvent(QMouseEvent *eventPress) {
}
in .cpp

its a virtual function and must be named like this.
It will then be called by system.
What you seems to try is to put MouseEvent *eventPress to a button click.
and it will be zero as it not filled out by system since a buttons click is not the same as mouse click.
so you sort of give it a empty QMouseEvent.

Note its protected: that is important.

uruloke

@mrjj
Ah so if I want it to run when a mouse is pressed I just have to run the mousePressEvent(QMouseEvent *eventPress)inside my onButtonClicked event?

mrjj

@uruloke
well Im not sure I understand.
Why dont you just run when button is clicked ?

mousePressEvent is for click on some spot on mainwindow where no control.

Dont call the mousePressEvent your self. system call it.

uruloke

@mrjj
Ah, yeah I forgot that it was an event :)

void mousePressEvent(QMouseEvent *eventPress) { QPoint p = mapFromGlobal(eventPress->globalPos()); ui->pixMap->setText( QString::number(p.x()) + "," + QString::number(p.x())); }

I get errors on mapFromGlobal now and ui, didn't get that before.

mrjj

@uruloke
try with

eventPress->pos().x();
eventPress->pos().y();

and no mapFromGlobal

oh and make sure its maiwindow::mousePressEvent(...) else it wont compile
if you are in the .cpp file.

uruloke

@mrjj
thanks a lot for the help.
It was just the mapFromGlobal that fucked it up.
It worked when I removed that.

QPoint p = eventPress->globalPos();
ui->pixMap->setText( QString::number(p.x()) + "," + QString::number(p.y()));

mrjj

@uruloke
ok.super.

Can I ask what you are programming ?

uruloke

@mrjj Sure, I am making a program to take screenshots with. So I need the mouse global position to mark the area to screenshot.

mrjj

@uruloke
ahh. such beast. :)
make sure to borrow from
http://doc.qt.io/qt-5/qtwidgets-desktop-screenshot-example.html

uruloke

@mrjj
I will, thanks for everything :)