Make show() default to sane sizing behaviour based on the platform.

Traditionally it's been hard to write a Qt app that behaves sanely
across embedded and desktop platforms, i.e. defaults to fullscreen on
embedded and non-fullscreen on desktop. For Qt 5 we can fix this by
making the behaviour of the default QWindow::show() be customizable by
the platform plugin.

If the application developer wants to override this behaviour he can
still use the explicit showFullScreen(), showNormal() etc functions.

Change-Id: I26a907b404058e345d841c818daefbb57a26d3fd
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>

1 files changed, 18 insertions, 4 deletions

diff --git a/src/gui/kernel/qwindow.cpp b/src/gui/kernel/qwindow.cpp
index 2e724e1b3c..0d08316945 100644
--- a/src/gui/kernel/qwindow.cpp
+++ b/src/gui/kernel/qwindow.cpp
@@ -54,6 +54,8 @@
 
 #include <QtCore/QDebug>
 
+#include <QStyleHints>
+
 QT_BEGIN_NAMESPACE
 
 /*!
@@ -741,30 +743,42 @@ QObject *QWindow::focusObject() const
     return const_cast<QWindow *>(this);
 }
 
+void QWindow::show()
+{
+    if (qApp->styleHints()->showIsFullScreen())
+        showFullScreen();
+    else
+        showNormal();
+}
+
+void QWindow::hide()
+{
+    setVisible(false);
+}
 
 void QWindow::showMinimized()
 {
     setWindowState(Qt::WindowMinimized);
-    show();
+    setVisible(true);
 }
 
 void QWindow::showMaximized()
 {
     setWindowState(Qt::WindowMaximized);
-    show();
+    setVisible(true);
 }
 
 void QWindow::showFullScreen()
 {
     setWindowState(Qt::WindowFullScreen);
-    show();
+    setVisible(true);
     requestActivateWindow();
 }
 
 void QWindow::showNormal()
 {
     setWindowState(Qt::WindowNoState);
-    show();
+    setVisible(true);
 }
 
 bool QWindow::close()