qt常用鼠标事件

头文件

protected:
    void paintEvent(QPaintEvent* ) override;
    void mouseMoveEvent(QMouseEvent *e) override;
    void mousePressEvent(QMouseEvent *e) override;
    void mouseReleaseEvent(QMouseEvent *) override;

private:
    Ui::MainInterface *ui;
    QPoint press_point;//鼠标按下去的点
    bool is_move;

源文件

void MainInterface::paintEvent(QPaintEvent *)
{
    QPixmap pixmap = QPixmap(QApplication::applicationDirPath() + QString("/") + XX_MAINFRAME_BACKGROUND).scaled(this->size());
    QPainter painter(this);
    painter.drawPixmap(this->rect(), pixmap);
}

void MainInterface::mouseMoveEvent(QMouseEvent *e)
{
    if((e->buttons() == Qt::LeftButton) && is_move)
    {
        QWidget::mousePressEvent(e);
        QPoint mouseP = e->globalPos();
        QPoint endP(mouseP.x() - press_point.x(), mouseP.y() - press_point.y());
        this->move(endP);
    }
}

void MainInterface::mousePressEvent(QMouseEvent *e)
{
    is_move = true;
    press_point = QPoint();
    QWidget::mousePressEvent(e);
    QPoint mouseP = e->globalPos();
    int x = this->geometry().topLeft().x();
    int y = this->geometry().topLeft().y();
    int x_w = mouseP.x() - x;
    int y_w = mouseP.y() - y;
    press_point.setX(x_w);
    press_point.setY(y_w);
}

void MainInterface::mouseReleaseEvent(QMouseEvent *)
{
    if(is_move)
    {
        is_move = false;
    }
}