1.使用事件过滤器实现
 
bool QUIWidget::eventFilter(QObject *watched, QEvent *event)
{
    static QPoint mousePoint;
    static bool mousePressed = false;

    QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(event);
    if (mouseEvent->type() == QEvent::MouseButtonPress) {
        if (mouseEvent->button() == Qt::LeftButton) {
            mousePressed = true;
            mousePoint = mouseEvent->globalPos() - this->pos();
        }
    } else if (mouseEvent->type() == QEvent::MouseButtonRelease) {
        mousePressed = false;
    } else if (mouseEvent->type() == QEvent::MouseMove) {
        if (mousePressed && (mouseEvent->buttons() && Qt::LeftButton)) {
            if (this->property("canMove").toBool()) {
                this->move(mouseEvent->globalPos() - mousePoint);
            }
        }
    } else if (mouseEvent->type() == QEvent::MouseButtonDblClick) {
        //以下写法可以将双击识别限定在标题栏
        if (this->btnMenu_Max->isVisible() && watched == this->widgetTitle) {
            //if (this->btnMenu_Max->isVisible()) {
            this->on_btnMenu_Max_clicked();
        }
    }

    return QWidget::eventFilter(watched, event);
}
 
看最后一段:
 
(mouseEvent->type() == QEvent::MouseButtonDblClick) {
        //下面可以写自己的代码
        //以下写法可以将双击识别限定在标题栏
        if (this->btnMenu_Max->isVisible() && watched == this->widgetTitle) {
            //if (this->btnMenu_Max->isVisible()) {
            this->on_btnMenu_Max_clicked();
        }
    }
 
2.安装过滤器
 
this->widgetTitle->installEventFilter(this);

原文链接：http://blog.csdn.net/humanking7/article/details/52752544
 

 
 
引子
 
用MFC写的程序，双击标题栏，程序会最大化，再次双击程序还原，如何禁止这样响应呢？
 
其实这是需要自己对 WM_NCLBUTTONDBLCLK 的消息进行处理。
 
具体做法
 
重载 DefWindowProc( ) 函数，过滤WM_NCLBUTTONDBLCLK在HTCAPTION区的响应即可。
 
这种做法就是，将消息在实现这个功能之前将它过滤掉。
 
在 类向导 上，重载 虚函数 “ DefWindowProc( ) ”，在里面过滤掉 WM_NCLBUTTONDBLCLK在HTCAPTION区的响应。
 
代码
 

LRESULT CStationSheet::DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
    //add qfx 2015.10.7
    switch(message)
    {
    case WM_NCLBUTTONDBLCLK: 
        if(HTCAPTION==wParam) 
        { 
            return 0; 
        }
    }

    return CBCGPPropertySheet::DefWindowProc(message, wParam, lParam);
}
 

 

protected override void WndProc(ref Message m)
{           
    if (m.Msg==0x112)
    {
        switch ((int) m.WParam)
        {
            //禁止双击标题栏关闭窗体
            case 0xF063:
            case 0xF093:
                m.WParam = IntPtr.Zero;
                break;

            //禁止拖拽标题栏还原窗体
            case 0xF012:
            case 0xF010:
                m.WParam = IntPtr.Zero;
                break;

           //禁止双击标题栏
            case 0xf122:
                m.WParam = IntPtr.Zero;
                break;

            //禁止关闭按钮
            case 0xF060:
                m.WParam = IntPtr.Zero;
                break;

            //禁止最大化按钮
            case 0xf020:
                m.WParam = IntPtr.Zero;
                break;

            //禁止最小化按钮
            case 0xf030:
                m.WParam = IntPtr.Zero;
                break;

            //禁止还原按钮
            case 0xf120:
                m.WParam = IntPtr.Zero;
                break;
           }
    }           
    base.WndProc(ref m);
}
 
 

widget.h
 
 
 
virtual bool event(QEvent *event);
 
 
　　
 
widget.cpp
 
 
 
bool Widget::event(QEvent *event)
{
    if (event->type() == QEvent::NonClientAreaMouseButtonDblClick)
                qDebug() << "title double clicked event";
    return QWidget::event(event);
}