blankscreen.cpp

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#include "blankscreen.h"

#include <QApplication>
#include <QProcess>
#include <QDesktopWidget>
#include <QTimer>

#include <X11/Xlib.h>

struct BlankScreen_Sysdep {
   Display *dpy;
};

BlankScreen::BlankScreen() : QDialog(nullptr)
{
   _sysdep = new BlankScreen_Sysdep;
   _sysdep->dpy = XOpenDisplay(nullptr);
   if (_sysdep->dpy == nullptr)
      return;

   setWindowFlags(Qt::WindowStaysOnTopHint | Qt::X11BypassWindowManagerHint | Qt::FramelessWindowHint);
   setStyleSheet("background-color:#000");

   _locked = false;
   auto *upper = new QTimer(this);
   connect(upper, &QTimer::timeout, this, &BlankScreen::timer_moveToTop);
   upper->start(1111);
}

BlankScreen::~BlankScreen()
{
   unlock();
   if (_sysdep->dpy != nullptr) {
      XCloseDisplay(_sysdep->dpy);
   }
   delete _sysdep;
}

bool BlankScreen::lock(const QString& message)
{
   if (_locked)
      return true;
   if (_sysdep->dpy == nullptr)
      return false;

   _message = message;

   this->setGeometry(QApplication::desktop()->geometry());
   this->showFullScreen();
   this->activateWindow();
   this->raise();

   // grabbing of keyboard and mouse
#
   XGrabKeyboard(_sysdep->dpy, DefaultRootWindow(_sysdep->dpy), false, GrabModeAsync, GrabModeAsync, CurrentTime);
   XGrabPointer(_sysdep->dpy, DefaultRootWindow(_sysdep->dpy), false, 0, GrabModeAsync, GrabModeAsync, None, 0, CurrentTime);


   QProcess ungrabP;
   ungrabP.start("/bin/bash", QStringList() << "/opt/openslx/pvs2/kb-lock.sh");
   ungrabP.waitForFinished();

   _locked = true;
   return true;
}

bool BlankScreen::unlock()
{
   this->hide();
   if (!_locked)
      return true;
   if (_sysdep->dpy == nullptr)
      return false;

   // ungrabbing of keyboard and mouse
   XUngrabPointer(_sysdep->dpy, CurrentTime);
   XUngrabKeyboard(_sysdep->dpy, CurrentTime);

   XFlush(_sysdep->dpy);

   /* start the kb-unlock.sh script */
   QProcess regrabP;
   regrabP.start("/bin/bash", QStringList() << "/opt/openslx/pvs2/kb-unlock.sh");
   regrabP.waitForFinished();

   _locked = false;
   return true;
}

void BlankScreen::timer_moveToTop()
{
   if (this->isHidden())
      return;
   activateWindow();
   raise();
}