From 2220a26450eea133815e91bed7d1a71c848a99cc Mon Sep 17 00:00:00 2001
From: Friedemann Kleint <Friedemann.Kleint@digia.com>
Date: Mon, 25 Aug 2014 17:13:26 +0200
Subject: [PATCH] WIP: Query input method hints in Windows QPA plugin.

TODO: Does not work; there does not seem to be a way to
cancel the composition once WM_IME_STARTCOMPOSITION is received.
Canceling in WM_IME_COMPOSITION does not work either, it immediately
restarts.

Task-number: QTBUG-40691
Change-Id: Idcab144e9d7dd77f6ead7ac2ee8219b8417d6e4b
---
 .../platforms/windows/qwindowsinputcontext.cpp     | 26 +++++++++++++++++-----
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/src/plugins/platforms/windows/qwindowsinputcontext.cpp b/src/plugins/platforms/windows/qwindowsinputcontext.cpp
index f8676c3..68ad4b0 100644
--- a/src/plugins/platforms/windows/qwindowsinputcontext.cpp
+++ b/src/plugins/platforms/windows/qwindowsinputcontext.cpp
@@ -334,12 +334,26 @@ bool QWindowsInputContext::startComposition(HWND hwnd)
     QWindow *window = qApp->focusWindow();
     if (!window)
         return false;
-    qCDebug(lcQpaInputMethods) << __FUNCTION__ << fo << window;
-    if (!fo || QWindowsWindow::handleOf(window) != hwnd)
-        return false;
-    initContext(hwnd, fo);
-    startContextComposition();
-    return true;
+    bool startComposition = false;
+    do {
+        if (!fo || QWindowsWindow::handleOf(window) != hwnd)
+            break;
+        const QVariant hintsV = QInputMethod::queryFocusObject(Qt::ImHints, QVariant());
+        if (!hintsV.isValid()) // QQuickRootItem, etc do not have the query method.
+            break;
+        const Qt::InputMethodHints hints(hintsV.toInt());
+        if (hints.testFlag(Qt::ImhHiddenText))
+            break;
+        startComposition = true;
+    } while (false);
+    qCDebug(lcQpaInputMethods) << __FUNCTION__ << fo << window << "startComposition=" << startComposition;
+    if (startComposition) {
+        initContext(hwnd, fo);
+        startContextComposition();
+    } else {
+        imeNotifyCancelComposition(hwnd);
+    }
+    return startComposition;
 }
 
 void QWindowsInputContext::startContextComposition()
-- 
1.9.4.msysgit.0