1 files changed, 23 insertions, 4 deletions

diff --git a/src/gui/kernel/qapplication.cpp b/src/gui/kernel/qapplication.cpp
index a2c058a..438a17e 100644
--- a/src/gui/kernel/qapplication.cpp
+++ b/src/gui/kernel/qapplication.cpp
@@ -187,8 +187,10 @@ QApplicationPrivate::QApplicationPrivate(int &argc, char **argv, QApplication::T
     directPainters = 0;
 #endif
 
+#ifndef QT_NO_GESTURES
     gestureManager = 0;
     gestureWidget = 0;
+#endif // QT_NO_GESTURES
 
 #if defined(Q_WS_X11) || defined(Q_WS_WIN)
     move_cursor = 0;
@@ -780,6 +782,9 @@ void QApplicationPrivate::construct(
 
     qt_is_gui_used = (qt_appType != QApplication::Tty);
     process_cmdline();
+    // the environment variable has the lowest precedence of runtime graphicssystem switches
+    if (graphics_system_name.isEmpty())
+        graphics_system_name = QString::fromLocal8Bit(qgetenv("QT_GRAPHICSSYSTEM"));
     // Must be called before initialize()
     qt_init(this, qt_appType
 #ifdef Q_WS_X11
@@ -1560,10 +1565,18 @@ QStyle* QApplication::setStyle(const QString& style)
     on-screen widgets and QPixmaps. The available systems are \c{"native"},
     \c{"raster"} and \c{"opengl"}.
 
-    This function call overrides both the application commandline
-    \c{-graphicssystem} switch and the configure \c{-graphicssystem} switch.
+    There are several ways to set the graphics backend, in order of decreasing
+    precedence:
+    \list
+        \o the application commandline \c{-graphicssystem} switch
+        \o QApplication::setGraphicsSystem()
+        \o the QT_GRAPHICSSYSTEM environment variable
+        \o the Qt configure \c{-graphicssystem} switch
+    \endlist
+    If the highest precedence switch sets an invalid name, the error will be
+    ignored and the default backend will be used.
 
-    \warning This function must be called before the QApplication constructor
+    \warning This function is only effective before the QApplication constructor
     is called.
 
     \note The \c{"opengl"} option is currently experimental.
@@ -3707,6 +3720,7 @@ bool QApplication::notify(QObject *receiver, QEvent *e)
 #endif // !QT_NO_WHEELEVENT || !QT_NO_TABLETEVENT
     }
 
+#ifndef QT_NO_GESTURES
     // walk through parents and check for gestures
     if (d->gestureManager) {
         switch (e->type()) {
@@ -3751,7 +3765,7 @@ bool QApplication::notify(QObject *receiver, QEvent *e)
             }
         }
     }
-
+#endif // QT_NO_GESTURES
 
     // User input and window activation makes tooltips sleep
     switch (e->type()) {
@@ -4256,6 +4270,7 @@ bool QApplication::notify(QObject *receiver, QEvent *e)
         res = d->notify_helper(receiver, e);
         break;
 
+#ifndef QT_NO_GESTURES
     case QEvent::NativeGesture:
     {
         // only propagate the first gesture event (after the GID_BEGIN)
@@ -4334,6 +4349,7 @@ bool QApplication::notify(QObject *receiver, QEvent *e)
         }
         break;
     }
+#endif // QT_NO_GESTURES
     default:
         res = d->notify_helper(receiver, e);
         break;
@@ -5297,6 +5313,7 @@ void QApplication::setInputContext(QInputContext *inputContext)
     }
     delete QApplicationPrivate::inputContext;
     QApplicationPrivate::inputContext = inputContext;
+    QApplicationPrivate::inputContext->setParent(this);
 }
 
 /*!
@@ -5766,6 +5783,7 @@ Q_GUI_EXPORT void qt_translateRawTouchEvent(QWidget *window,
     QApplicationPrivate::translateRawTouchEvent(window, deviceType, touchPoints);
 }
 
+#ifndef QT_NO_GESTURES
 QGestureManager* QGestureManager::instance()
 {
     QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();
@@ -5773,6 +5791,7 @@ QGestureManager* QGestureManager::instance()
         qAppPriv->gestureManager = new QGestureManager(qApp);
     return qAppPriv->gestureManager;
 }
+#endif // QT_NO_GESTURES
 
 // These pixmaps approximate the images in the Windows User Interface Guidelines.