Added possibleKeys(QKeyEvent *) to QWindowsIntegration

Task-number: QTBUG-26902
Change-Id: I08d244816eae8794b52f244f049ee1fb825dac8b
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/plugins/platforms/windows/qwindowscontext.cpp

@@ -331,6 +331,11 @@ bool QWindowsContext::useRTLExtensions() const
     return d->m_keyMapper.useRTLExtensions();
 }
 
+QList<int> QWindowsContext::possibleKeys(const QKeyEvent *e) const
+{
+    return d->m_keyMapper.possibleKeys(e);
+}
+
 void QWindowsContext::setWindowCreationContext(const QSharedPointer<QWindowCreationContext> &ctx)
 {
     d->m_creationContext = ctx;

src/plugins/platforms/windows/qwindowscontext.h

@@ -60,6 +60,7 @@ class QWindowsMimeConverter;
 struct QWindowCreationContext;
 struct QWindowsContextPrivate;
 class QPoint;
+class QKeyEvent;
 
 #ifndef Q_OS_WINCE
 struct QWindowsUser32DLL
@@ -170,6 +171,7 @@ public:
     unsigned systemInfo() const;
 
     bool useRTLExtensions() const;
+    QList<int> possibleKeys(const QKeyEvent *e) const;
 
     QWindowsMimeConverter &mimeConverter() const;
     QWindowsScreenManager &screenManager();

src/plugins/platforms/windows/qwindowsintegration.cpp

@@ -447,6 +447,11 @@ Qt::KeyboardModifiers QWindowsIntegration::queryKeyboardModifiers() const
     return QWindowsKeyMapper::queryKeyboardModifiers();
 }
 
+QList<int> QWindowsIntegration::possibleKeys(const QKeyEvent *e) const
+{
+    return d->m_context.possibleKeys(e);
+}
+
 QPlatformNativeInterface *QWindowsIntegration::nativeInterface() const
 {
     return &d->m_nativeInterface;

src/plugins/platforms/windows/qwindowsintegration.h

@@ -81,6 +81,7 @@ public:
     virtual QVariant styleHint(StyleHint hint) const;
 
     virtual Qt::KeyboardModifiers queryKeyboardModifiers() const;
+    virtual QList<int> possibleKeys(const QKeyEvent *e) const;
 
     static QWindowsIntegration *instance();
 

src/plugins/platforms/windows/qwindowskeymapper.cpp

@@ -1119,4 +1119,30 @@ Qt::KeyboardModifiers QWindowsKeyMapper::queryKeyboardModifiers()
     return modifiers;
 }
 
+QList<int> QWindowsKeyMapper::possibleKeys(const QKeyEvent *e) const
+{
+    QList<int> result;
+
+    KeyboardLayoutItem *kbItem = keyLayout[e->nativeVirtualKey()];
+    if (!kbItem)
+        return result;
+
+    quint32 baseKey = kbItem->qtKey[0];
+    Qt::KeyboardModifiers keyMods = e->modifiers();
+    if (baseKey == Qt::Key_Return && (e->nativeModifiers() & ExtendedKey)) {
+        result << int(Qt::Key_Enter + keyMods);
+        return result;
+    }
+    result << int(baseKey + keyMods); // The base key is _always_ valid, of course
+
+    for (int i = 1; i < 9; ++i) {
+        Qt::KeyboardModifiers neededMods = ModsTbl[i];
+        quint32 key = kbItem->qtKey[i];
+        if (key && key != baseKey && ((keyMods & neededMods) == neededMods))
+            result << int(key + (keyMods & ~neededMods));
+    }
+
+    return result;
+}
+
 QT_END_NAMESPACE

src/plugins/platforms/windows/qwindowskeymapper.h

@@ -48,6 +48,7 @@
 
 QT_BEGIN_NAMESPACE
 
+class QKeyEvent;
 class QWindow;
 
 struct KeyboardLayoutItem;
@@ -70,6 +71,7 @@ public:
     void setKeyGrabber(QWindow *w)   { m_keyGrabber = w; }
 
     static Qt::KeyboardModifiers queryKeyboardModifiers();
+    QList<int> possibleKeys(const QKeyEvent *e) const;
 
 private:
     bool translateKeyEventInternal(QWindow *receiver, const MSG &msg, bool grab);