iOS: Return correct QLocale from QIOSInputContext

Ensure we return a correct QLocale on iOS by overriding
QPlatformInputContext::locale().

A broader implementation involving subclassing QSystemLocale
will be done in dev.

Task-number: QTBUG-48772
Change-Id: I5250bdad320cbe66d63456926f6eab6fc2865424
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>

src/plugins/platforms/ios/qiosinputcontext.h

@@ -36,6 +36,7 @@
 
 #include <UIKit/UIKit.h>
 
+#include <QtCore/qlocale.h>
 #include <QtGui/qevent.h>
 #include <QtGui/qtransform.h>
 #include <qpa/qplatforminputcontext.h>
@@ -46,6 +47,7 @@ const char kImePlatformDataReturnKeyType[] = "returnKeyType";
 
 QT_BEGIN_NAMESPACE
 
+@class QIOSLocaleListener;
 @class QIOSKeyboardListener;
 @class QIOSTextInputResponder;
 @protocol KeyboardState;
@@ -92,6 +94,8 @@ public:
     void reset() Q_DECL_OVERRIDE;
     void commit() Q_DECL_OVERRIDE;
 
+    QLocale locale() const Q_DECL_OVERRIDE;
+
     void clearCurrentFocusObject();
 
     void setFocusObject(QObject *object) Q_DECL_OVERRIDE;
@@ -112,6 +116,7 @@ public:
 private:
     UIView* scrollableRootView();
 
+    QIOSLocaleListener *m_localeListener;
     QIOSKeyboardListener *m_keyboardHideGesture;
     QIOSTextInputResponder *m_textResponder;
     KeyboardState m_keyboardState;

src/plugins/platforms/ios/qiosinputcontext.mm

@@ -56,6 +56,39 @@ static QUIView *focusView()
 
 // -------------------------------------------------------------------------
 
+@interface QIOSLocaleListener : NSObject
+@end
+
+@implementation QIOSLocaleListener
+
+- (id)init
+{
+    if (self = [super init]) {
+        NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
+        [notificationCenter addObserver:self
+            selector:@selector(localeDidChange:)
+            name:NSCurrentLocaleDidChangeNotification object:nil];
+    }
+
+    return self;
+}
+
+- (void)dealloc
+{
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+    [super dealloc];
+}
+
+- (void)localeDidChange:(NSNotification *)notification
+{
+    Q_UNUSED(notification);
+    QIOSInputContext::instance()->emitLocaleChanged();
+}
+
+@end
+
+// -------------------------------------------------------------------------
+
 @interface QIOSKeyboardListener : UIGestureRecognizer <UIGestureRecognizerDelegate> {
   @private
     QIOSInputContext *m_context;
@@ -285,6 +318,7 @@ QIOSInputContext *QIOSInputContext::instance()
 
 QIOSInputContext::QIOSInputContext()
     : QPlatformInputContext()
+    , m_localeListener([QIOSLocaleListener new])
     , m_keyboardHideGesture([[QIOSKeyboardListener alloc] initWithQIOSInputContext:this])
     , m_textResponder(0)
 {
@@ -298,6 +332,7 @@ QIOSInputContext::QIOSInputContext()
 
 QIOSInputContext::~QIOSInputContext()
 {
+    [m_localeListener release];
     [m_keyboardHideGesture.view removeGestureRecognizer:m_keyboardHideGesture];
     [m_keyboardHideGesture release];
 
@@ -657,3 +692,8 @@ void QIOSInputContext::commit()
     [m_textResponder unmarkText];
     [m_textResponder notifyInputDelegate:Qt::ImSurroundingText];
 }
+
+QLocale QIOSInputContext::locale() const
+{
+    return QLocale(QString::fromNSString([[NSLocale currentLocale] objectForKey:NSLocaleIdentifier]));
+}