Expose the number of X screen through the QXcbScreenFunctions

X screen corresponds to Qt virtual desktop, and RandR output
corresponds to QScreen. There can be more than one X screen,
so we need a way to get the number of X screen for QScreen,
in particular for the right implementation of some methods
in QX11Info.

Change-Id: Ib5e38703bf11ae08bb283f26a7b7b15f1a5e8671
Reviewed-by: Shawn Rutledge <shawn.rutledge@theqtcompany.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/plugins/platforms/xcb/qxcbnativeinterface.cpp b/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
index f6bd878bde..96239a0f20 100644
--- a/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
+++ b/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
@@ -48,6 +48,7 @@
 
 #include <QtPlatformHeaders/qxcbwindowfunctions.h>
 #include <QtPlatformHeaders/qxcbintegrationfunctions.h>
+#include <QtPlatformHeaders/qxcbscreenfunctions.h>
 
 #ifndef QT_NO_DBUS
 #include "QtPlatformSupport/private/qdbusmenuconnection_p.h"
@@ -367,6 +368,10 @@ QFunctionPointer QXcbNativeInterface::platformFunction(const QByteArray &functio
     if (function == QXcbWindowFunctions::visualIdIdentifier()) {
         return QFunctionPointer(QXcbWindowFunctions::VisualId(QXcbWindow::visualIdStatic));
     }
+
+    if (function == QXcbScreenFunctions::virtualDesktopNumberIdentifier())
+        return QFunctionPointer(QXcbScreenFunctions::VirtualDesktopNumber(QXcbScreen::virtualDesktopNumberStatic));
+
     return Q_NULLPTR;
 }