Add function QPlatformScreen::platformScreenForWidget

This so there is some logical connection between what screen a widget
belongs to

1 files changed, 15 insertions, 0 deletions

diff --git a/src/gui/kernel/qplatformscreen_qpa.cpp b/src/gui/kernel/qplatformscreen_qpa.cpp
index 5e80ba8..118835f 100644
--- a/src/gui/kernel/qplatformscreen_qpa.cpp
+++ b/src/gui/kernel/qplatformscreen_qpa.cpp
@@ -41,7 +41,11 @@
 
 #include "qplatformscreen_qpa.h"
 #include <QtGui/qapplication.h>
+#include <QtGui/private/qapplication_p.h>
 #include <QtGui/qdesktopwidget.h>
+#include <QtGui/qplatformintegration_qpa.h>
+#include <QtGui/qwidget.h>
+#include <QtGui/private/qwidget_p.h>
 
 /*!
     Return the given top level widget for a given position.
@@ -77,6 +81,17 @@ QSize QPlatformScreen::physicalSize() const
     return QSize(width,height);
 }
 
+Q_GUI_EXPORT extern QWidgetPrivate *qt_widget_private(QWidget *widget);
+QPlatformScreen * QPlatformScreen::platformScreenForWidget(const QWidget *widget)
+{
+    QWidget *window = widget->window();
+    QWidgetPrivate *windowPrivate = qt_widget_private(window);
+    QTLWExtra * topData = windowPrivate->topData();
+    QPlatformIntegration *integration =
+            QApplicationPrivate::platformIntegration();
+    return integration->screens()[topData->screenIndex];
+}
+
 /*!
     \class QPlatformScreen
     \since 4.8