Use QtPlatformHeaders to set platform specific functionality

This involves exposing a new function in the QPlatformNativeInterface
which gets a public function for QGuiApplication

Proof of concept is done through implementing _NET_WM_WINDOW_TYPE
setters for xcb

Change-Id: Ic9544e775fb71cc9b30273595ec41b1cdb1c9d64
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index 827bf0164b..2d5f717222 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -1413,6 +1413,20 @@ QPlatformNativeInterface *QGuiApplication::platformNativeInterface()
 }
 
 /*!
+    Returns a function pointer from the platformplugin matching \a function
+*/
+QFunctionPointer QGuiApplication::platformFunction(const QByteArray &function)
+{
+    QPlatformIntegration *pi = QGuiApplicationPrivate::platformIntegration();
+    if (!pi) {
+        qWarning() << "QGuiApplication::platformFunction(): Must construct a QGuiApplication before accessing a platform function";
+        return Q_NULLPTR;
+    }
+
+    return pi->nativeInterface() ? pi->nativeInterface()->platformFunction(function) : Q_NULLPTR;
+}
+
+/*!
     Enters the main event loop and waits until exit() is called, and then
     returns the value that was set to exit() (which is 0 if exit() is called
     via quit()).