Qt linux下无法移动出屏幕

测试环境: KUbuntu 20.04, Ubuntu 18.04.4

最近做了一个Qt无边框的程序,发现用Qt MouseMoveEvent 代码移动窗体,无法移出屏幕.

经过测试,发现就算带有系统边框,也无法移出屏幕,但是按住系统标题栏进行移动就可以.

 

在网上搜索了很久找到了对应的方法:

原文地址: 

https://www.byteisland.com/linux-qt-%E6%97%A0%E8%BE%B9%E6%A1%86%E7%AA%97%E4%BD%93%E7%9A%84%E7%A7%BB%E5%8A%A8%E4%BB%A5%E5%8F%8A%E7%A6%81%E6%AD%A2%E4%BD%BF%E7%94%A8%E7%AA%97%E4%BD%93%E7%9A%84%E6%9C%80%E5%A4%A7%E5%8C%96/

主要代码:

一.需要安装x11的开发环境
sudo apt install libxau-dev libx11-dev libxext-dev libxtst-dev

二.pro改动:
unix {
    QT += x11extras
    LIBS += -lX11
}

3.#xxxwidget.cpp


#ifdef Q_OS_LINUX

#include 

#include 

#endif
#include 


void xxxx::mousePressEvent(QMouseEvent *e)
{
    if(pMoveWidget && !pMoveWidget->isFullScreen && !pMoveWidget->isMaximized())
    {
         m_pressed = true;
         m_pressedMovePos = pMoveWidget->pos();
         m_pressedPos     = this->mapToGlobal(e->pos());
    }
    e->accept();
}


void xxxx::mouseMoveEvent(QMouseEvent *e)

{

    if(pMoveWidget && m_pressed)

    {

        QPoint pos = this->mapToGlobal(e->pos());

#ifdef Q_OS_LINUX        
        XEvent event;
        memset(&event, 0, sizeof(XEvent));

        Display *display = QX11Info::display();
        event.xclient.type = ClientMessage;
        event.xclient.message_type = XInternAtom(display, "_NET_WM_MOVERESIZE", False);
        event.xclient.display = display;
        //wid 是当前程序的 window id，可以通过 QWidget->wId()获得，QWidget 必须实例化
        event.xclient.window = (XID)(pMoveWidget ->winId());
        event.xclient.format = 32;
        event.xclient.data.l[0] = pos.x();
        event.xclient.data.l[1] = pos.y();
        event.xclient.data.l[2] = 8;
        event.xclient.data.l[3] = Button1;
        event.xclient.data.l[4] = 1;

        XUngrabPointer(display, CurrentTime);
        XSendEvent(display, 
                   QX11Info::appRootWindow(QX11Info::appScreen()),
                   False, 
                   SubstructureNotifyMask | SubstructureRedirectMask,
                   &event);
        XFlush(display);
#else
        pMoveWidget->move(m_pressedMovePos/*按下时的窗口坐标*/ + pos - m_pressedPos/*按下时的屏幕坐标*/);

#endif

    }

    e->accept();

}