QT自定义标题栏窗口移动

设置自定义的标题栏需要修改鼠标移动事件，这样窗口才能移动。
有一点点的bug，窗口会突然移动，后续修改。

代码

.h文件

//函数
void mousePressEvent(QMouseEvent *event);
void mouseMoveEvent(QMouseEvent *event);
void mouseReleaseEvent(QMouseEvent *event);

//变量
bool            mPressBool;
QPoint          mouseStartPoint;
QPoint          mwindowTopLeftPoint;
QDockWidget*    mpDockMouse;

.cpp文件

//申请内存并隐藏
mpDockMouse = new QDockWidget(this);
mpDockMouse->hide();

void mTitleBar::mousePressEvent(QMouseEvent *event)
{

    if(event->button() == Qt::LeftButton)
    {
        mPressBool = true;
        //获得鼠标的初始位置
        mouseStartPoint = event->globalPos();
        //获得窗口的初始位置
        mpDockMouse = qobject_cast<QDockWidget*>(parentWidget());
        mwindowTopLeftPoint = mpDockMouse->frameGeometry().topLeft();

    }
}

void mTitleBar::mouseMoveEvent(QMouseEvent *event)
{
    if(mPressBool)
    {
        //获得鼠标移动的距离
        QPoint distance = event->globalPos() - mouseStartPoint;
        //改变窗口的位置
        mpDockMouse = qobject_cast<QDockWidget*>(parentWidget());
        mpDockMouse->move(mwindowTopLeftPoint + distance);
    }
}

void mTitleBar::mouseReleaseEvent(QMouseEvent *event)
{
    if(event->button() == Qt::LeftButton)
    {
        mPressBool = false;
    }
}