Detecting left mouse click

[privatepepper]

Hello,
How could I detect a left mouse click on the QGraphicsRectItems and know which QGraphicsRectItem was clicked? I am implementing multiple shortest path algorithms and I visualize them and I want that user could draw "walls".

[Pl45m4]

@privatepepper

There are several posts on how to do this. Use the search :)

https://doc.qt.io/qt-5/qgraphicsitem.html#mousePressEvent

[privatepepper]

I added this line to mainwindow header file

protected:
void mousePressEvent(QGraphicsSceneMouseEvent *mouseevent);

And now I am getting a warning - 'MainWindow::mousePressEvenet' hides overloaded virtual function. So, that means that I need to create a separate class for my QGraphicsScene that has QGraphicsRectItems?

[Pl45m4]

@privatepepper

Just do what's suggested there.
Change your line to:

void mousePressEvent(QGraphicsSceneMouseEvent *mouseevent) override;

[privatepepper]

@Pl45m4 said in Detecting left mouse click:

void mousePressEvent(QGraphicsSceneMouseEvent *mouseevent) override;

Thank you for the reply:), but when I changed my line to yours, I received new error - error: non-virtual member function marked 'override' hides virtual member function

[SGaist]

Hi,

A QMainWindow is not a QGraphicsScene. Take a good look at the method signatures of both these classes.

[privatepepper]

@SGaist

Thanks for the reply:), I will look into that, I thought that there is no difference where you create a
mousePressEvent, oh and by the way, I found another solution, I will loop through QGraphicsRectItem and if that rect isUnderMouse I will paint a wall there.
It's not perfect solution, but at least it works:)

void MainWindow::keyPressEvent(QKeyEvent *event){

    if (event->key() == Qt::Key_Space){

        for (int y = 0; y < height; y++){
            for (int x = 0; x < width; x++){

                if (cells[y][x]->isUnderMouse()){
                    cells[y][x]->setBrush(Qt::red);
                    vec.cells[y][x] = wall;
                }

            }
        }
    }

}