Cocoa: Implement QPlatformInputContext::locale().

Listen to NSTextInputContextKeyboardSelectionDidChangeNotification.

Task-number: QTBUG-48772
Change-Id: Icea4ef61fd184edbe65a7f195318832a22c312ab
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@theqtcompany.com>

src/plugins/platforms/cocoa/qcocoainputcontext.h

@@ -35,6 +35,7 @@
 #define QCOCOAINPUTCONTEXT_H
 
 #include <qpa/qplatforminputcontext.h>
+#include <QtCore/QLocale>
 #include <QtCore/QPointer>
 
 QT_BEGIN_NAMESPACE
@@ -50,12 +51,16 @@ public:
 
     void reset() Q_DECL_OVERRIDE;
 
+    QLocale locale() const Q_DECL_OVERRIDE { return m_locale; }
+    void updateLocale();
+
 private Q_SLOTS:
     void connectSignals();
     void focusObjectChanged(QObject *focusObject);
 
 private:
     QPointer<QWindow> mWindow;
+    QLocale m_locale;
 };
 
 QT_END_NAMESPACE

src/plugins/platforms/cocoa/qcocoainputcontext.mm

@@ -36,6 +36,8 @@
 #include "qcocoanativeinterface.h"
 #include "qcocoawindow.h"
 
+#include <Carbon/Carbon.h>
+
 #include <QtCore/QRect>
 #include <QtGui/QGuiApplication>
 #include <QtGui/QWindow>
@@ -76,6 +78,7 @@ QCocoaInputContext::QCocoaInputContext()
     , mWindow(QGuiApplication::focusWindow())
 {
     QMetaObject::invokeMethod(this, "connectSignals", Qt::QueuedConnection);
+    updateLocale();
 }
 
 QCocoaInputContext::~QCocoaInputContext()
@@ -116,4 +119,20 @@ void QCocoaInputContext::focusObjectChanged(QObject *focusObject)
     mWindow = QGuiApplication::focusWindow();
 }
 
+void QCocoaInputContext::updateLocale()
+{
+    TISInputSourceRef source = TISCopyCurrentKeyboardInputSource();
+    CFArrayRef languages = (CFArrayRef) TISGetInputSourceProperty(source, kTISPropertyInputSourceLanguages);
+    if (CFArrayGetCount(languages) > 0) {
+        CFStringRef langRef = (CFStringRef)CFArrayGetValueAtIndex(languages, 0);
+        QString name = QCFString::toQString(langRef);
+        QLocale locale(name);
+        if (m_locale != locale) {
+            m_locale = locale;
+            emitLocaleChanged();
+        }
+        CFRelease(langRef);
+    }
+}
+
 QT_END_NAMESPACE

src/plugins/platforms/cocoa/qnsview.h

@@ -95,6 +95,7 @@ Q_FORWARD_DECLARE_OBJC_CLASS(QT_MANGLE_NAMESPACE(QNSViewMouseMoveHelper));
 - (void)notifyWindowStateChanged:(Qt::WindowState)newState;
 - (void)windowNotification : (NSNotification *) windowNotification;
 - (void)notifyWindowWillZoom:(BOOL)willZoom;
+- (void)textInputContextKeyboardSelectionDidChangeNotification : (NSNotification *) textInputContextKeyboardSelectionDidChangeNotification;
 - (void)viewDidHide;
 - (void)viewDidUnhide;
 

src/plugins/platforms/cocoa/qnsview.mm

@@ -41,6 +41,7 @@
 #include "qcocoahelpers.h"
 #include "qmultitouch_mac_p.h"
 #include "qcocoadrag.h"
+#include "qcocoainputcontext.h"
 #include <qpa/qplatformintegration.h>
 
 #include <qpa/qwindowsysteminterface.h>
@@ -215,6 +216,11 @@ static NSString *_q_NSWindowDidChangeOcclusionStateNotification = nil;
                                           name:NSViewFrameDidChangeNotification
                                           object:self];
 
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                          selector:@selector(textInputContextKeyboardSelectionDidChangeNotification:)
+                                          name:NSTextInputContextKeyboardSelectionDidChangeNotification
+                                          object:nil];
+
     return self;
 }
 
@@ -464,6 +470,15 @@ QT_WARNING_POP
     }
 }
 
+- (void)textInputContextKeyboardSelectionDidChangeNotification : (NSNotification *) textInputContextKeyboardSelectionDidChangeNotification
+{
+    Q_UNUSED(textInputContextKeyboardSelectionDidChangeNotification)
+    if (([NSApp keyWindow] == [self window]) && [[self window] firstResponder] == self) {
+        QCocoaInputContext *ic = qobject_cast<QCocoaInputContext *>(QCocoaIntegration::instance()->inputContext());
+        ic->updateLocale();
+    }
+}
+
 - (void)notifyWindowWillZoom:(BOOL)willZoom
 {
     Qt::WindowState newState = willZoom ? Qt::WindowMaximized : Qt::WindowNoState;