qt5base-lts/tests/manual/qcursor/childwidget/main.cpp

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** Copyright (C) 2017 The Qt Company Ltd.
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** This file is part of the test suite of the Qt Toolkit.
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#include <QtWidgets>

class CursorWidget : public QWidget
{
public:
    CursorWidget(QCursor cursor, QColor color)
    :m_cursor(cursor)
    ,m_color(color)
    {
        if (cursor.shape() == Qt::ArrowCursor)
            unsetCursor();
        else
            setCursor(cursor);
    }

    void paintEvent(QPaintEvent *e)
    {
        QPainter p(this);
        p.fillRect(e->rect(), m_color);
    }

    void mousePressEvent(QMouseEvent *)
    {
        // Toggle cursor
        QCursor newCursor = (cursor().shape() == m_cursor.shape()) ? QCursor() : m_cursor;
        if (newCursor.shape() == Qt::ArrowCursor)
            unsetCursor();
        else
            setCursor(newCursor);
    }

private:
    QCursor m_cursor;
    QColor m_color;
};

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    // Test child widgets (one of which is native) with set cursors.
    // Click window to toggle cursor.

    CursorWidget w1((QCursor(Qt::SizeVerCursor)), QColor(Qt::blue).darker());
    w1.resize(200, 200);
    w1.show();

    CursorWidget w2((QCursor(Qt::OpenHandCursor)), QColor(Qt::red).darker());
    w2.setParent(&w1);
    w2.setGeometry(0, 0, 100, 100);
    w2.show();

    CursorWidget w3((QCursor(Qt::IBeamCursor)), QColor(Qt::green).darker());
    w3.winId();
    w3.setParent(&w1);
    w3.setGeometry(100, 100, 100, 100);
    w3.show();

    return app.exec();
}