Check if cursor is near a widget's edges

[swurl]

What would be the best way to go around checking if the cursor is near a widget's edges and determining which direction it is, without the use of massive if-blocks?

[ChrisW67]

This is one way:

    void mouseMoveEvent(QMouseEvent *event) {
        QRect r = rect() - QMargins(20, 20, 20, 20);
        // ^^^ assumes the client area is big enough to shrink 40 pixels.  Example only.
        const bool nearEdge = !r.contains(event->pos());
        // ^^^ near any edge
        const bool nearEdgeL = nearEdge && (event->pos().x() < r.left());
        const bool nearEdgeR = nearEdge && (event->pos().x() > r.right());
        const bool nearEdgeT = nearEdge && (event->pos().y() < r.top());
        const bool nearEdgeB = nearEdge && (event->pos().y() > r.bottom());
        // ^^^ More than one of these can true at the same time in corners
        qDebug() << nearEdge << nearEdgeL << nearEdgeR << nearEdgeT << nearEdgeB;
        QWidget::mouseMoveEvent(event);
    }

[swurl]

@ChrisW67 I figured this out on my own, but that's essentially what I came up with, additionally creating flags for the resize direction. Thanks!