Improved IME handling on Windows.

QWizard sets focus on a widget when switching to a page before the widget
becomes visible, which caused problems with our ime handling which didn't
enable ime correctly. The fix is to refactor the code to enable ime handling
whenever someone tells input context to set focus by calling
QInputContext::setFocusWidget instead of relying on FocusIn/Out events and
duplicating updateImeStatus calls all over Qt..

Task-number: 244604
Reviewed-by: Prasanth Ullattil

5 files changed, 21 insertions, 7 deletions

diff --git a/src/gui/inputmethod/qinputcontext_p.h b/src/gui/inputmethod/qinputcontext_p.h
index 8c1b8de..a5e3d91 100644
--- a/src/gui/inputmethod/qinputcontext_p.h
+++ b/src/gui/inputmethod/qinputcontext_p.h
@@ -84,10 +84,6 @@ public:
     {}
 
     QWidget *focusWidget;
-
-#if defined(Q_WS_WIN) || defined(Q_WS_QWS)
-    static void updateImeStatus(QWidget *w, bool hasFocus);
-#endif
 };
 
 QT_END_NAMESPACE
diff --git a/src/gui/inputmethod/qwininputcontext_p.h b/src/gui/inputmethod/qwininputcontext_p.h
index 38d7e32..c6ad19e 100644
--- a/src/gui/inputmethod/qwininputcontext_p.h
+++ b/src/gui/inputmethod/qwininputcontext_p.h
@@ -83,6 +83,7 @@ public:
     static void TranslateMessage(const MSG *msg);
     static LRESULT DefWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
 
+    static void updateImeStatus(QWidget *w, bool hasFocus);
     static void enablePopupChild(QWidget *w, bool e);
     static void enable(QWidget *w, bool e);
 
diff --git a/src/gui/inputmethod/qwininputcontext_win.cpp b/src/gui/inputmethod/qwininputcontext_win.cpp
index 720f0b8..663184f 100644
--- a/src/gui/inputmethod/qwininputcontext_win.cpp
+++ b/src/gui/inputmethod/qwininputcontext_win.cpp
@@ -753,7 +753,7 @@ inline void enableIme(QWidget *w,  bool value)
 }
 
 
-void QInputContextPrivate::updateImeStatus(QWidget *w, bool hasFocus)
+void QWinInputContext::updateImeStatus(QWidget *w, bool hasFocus)
 {
     if (!w)
         return;
@@ -822,6 +822,15 @@ void QWinInputContext::enable(QWidget *w, bool e)
 
 void QWinInputContext::setFocusWidget(QWidget *w)
 {
+    QWidget *oldFocus = focusWidget();
+    if (oldFocus == w)
+        return;
+    if (w) {
+        QWinInputContext::updateImeStatus(w, true);
+    } else {
+        if (oldFocus)
+            QWinInputContext::updateImeStatus(oldFocus , false);
+    }
     QInputContext::setFocusWidget(w);
     update();
 }
diff --git a/src/gui/inputmethod/qwsinputcontext_p.h b/src/gui/inputmethod/qwsinputcontext_p.h
index 20811da..835cb3f 100644
--- a/src/gui/inputmethod/qwsinputcontext_p.h
+++ b/src/gui/inputmethod/qwsinputcontext_p.h
@@ -87,6 +87,7 @@ public:
     static bool translateIMEvent(QWidget *w, const QWSIMEvent *e);
     static bool translateIMQueryEvent(QWidget *w, const QWSIMQueryEvent *e);
     static bool translateIMInitEvent(const QWSIMInitEvent *e);
+    static void updateImeStatus(QWidget *w, bool hasFocus);
 };
 
 QT_END_NAMESPACE
diff --git a/src/gui/inputmethod/qwsinputcontext_qws.cpp b/src/gui/inputmethod/qwsinputcontext_qws.cpp
index 46ac13d..6180c48 100644
--- a/src/gui/inputmethod/qwsinputcontext_qws.cpp
+++ b/src/gui/inputmethod/qwsinputcontext_qws.cpp
@@ -73,10 +73,17 @@ void QWSInputContext::reset()
 
 void QWSInputContext::setFocusWidget( QWidget *w )
 {
-  QWidget *oldFocus = focusWidget();
+    QWidget *oldFocus = focusWidget();
     if (oldFocus == w)
         return;
 
+    if (w) {
+        QWSInputContext::updateImeStatus(w, true);
+    } else {
+        if (oldFocus)
+            QWSInputContext::updateImeStatus(oldFocus, false);
+    }
+
     if (oldFocus) {
         QWidget *tlw = oldFocus->window();
         int winid = tlw->internalWinId();
@@ -224,7 +231,7 @@ bool QWSInputContext::translateIMEvent(QWidget *w, const QWSIMEvent *e)
 
 Q_GUI_EXPORT void (*qt_qws_inputMethodStatusChanged)(QWidget*) = 0;
 
-void QInputContextPrivate::updateImeStatus(QWidget *w, bool hasFocus)
+void QWSInputContext::updateImeStatus(QWidget *w, bool hasFocus)
 {
     Q_UNUSED(hasFocus);