From 7c5929218d1f79d757cf30b2f5069a1b6cb098e6 Mon Sep 17 00:00:00 2001
From: Friedemann Kleint <Friedemann.Kleint@qt.io>
Date: Fri, 29 Jul 2016 15:00:39 +0200
Subject: [PATCH] WIP: Experimentally launch tabtip.exe/virtual keyboard

TODO: Most likely the wrong approach, ImmAssociateContext(0)
has also been observed to launch it.

Task-number: QTBUG-43190
Change-Id: Ie99a0046baf2b775ce8344728f76e6b6139662a5
---
 .../platforms/windows/qwindowsinputcontext.cpp     |  1 +
 .../platforms/windows/qwindowskeymapper.cpp        | 32 ++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/src/plugins/platforms/windows/qwindowsinputcontext.cpp b/src/plugins/platforms/windows/qwindowsinputcontext.cpp
index 4d4be3d..5135857 100644
--- a/src/plugins/platforms/windows/qwindowsinputcontext.cpp
+++ b/src/plugins/platforms/windows/qwindowsinputcontext.cpp
@@ -228,6 +228,7 @@ void QWindowsInputContext::setFocusObject(QObject *)
 
 void QWindowsInputContext::updateEnabled()
 {
+
     if (!QGuiApplication::focusObject())
         return;
     const QWindow *window = QGuiApplication::focusWindow();
diff --git a/src/plugins/platforms/windows/qwindowskeymapper.cpp b/src/plugins/platforms/windows/qwindowskeymapper.cpp
index 1e58b9b..6373e48 100644
--- a/src/plugins/platforms/windows/qwindowskeymapper.cpp
+++ b/src/plugins/platforms/windows/qwindowskeymapper.cpp
@@ -37,13 +37,17 @@
 #include "qwindowswindow.h"
 #include "qwindowsinputcontext.h"
 
+#include <QtGui/QDesktopServices>
 #include <QtGui/QGuiApplication>
 #include <QtGui/QWindow>
 #include <qpa/qwindowsysteminterface.h>
 #include <private/qguiapplication_p.h>
 #include <private/qhighdpiscaling_p.h>
+#include <QtGui/QInputMethod>
 #include <QtGui/QKeyEvent>
 #include <QtPlatformSupport/private/qwindowsguieventdispatcher_p.h>
+#include <QtCore/QDir>
+#include <QtCore/QUrl>
 
 #if defined(WM_APPCOMMAND)
 #  ifndef FAPPCOMMAND_MOUSE
@@ -89,6 +93,32 @@ QT_BEGIN_NAMESPACE
 
 static void clearKeyRecorderOnApplicationInActive(Qt::ApplicationState state);
 
+static QUrl tabTipBinary()
+{
+    QByteArray programFiles = qgetenv("ProgramFiles");
+    if (QSysInfo::WordSize == 32 && programFiles.endsWith(" (x86)"))
+        programFiles.chop(6); // Lives in 64bit dir.
+    const QString binary = QDir::cleanPath(QFile::decodeName(programFiles))
+        + QStringLiteral("/Common Files/Microsoft Shared/Ink/tabtip.exe");
+    return QFileInfo(binary).isFile() ? QUrl::fromLocalFile(binary) : QUrl();
+}
+
+static void startSoftwareKeyboard(QObject *focusObject)
+{
+    static const QUrl binary = tabTipBinary();
+    if (!focusObject || !binary.isValid()
+        || !QWindowsIntegration::instance()->inputContext()->inputMethodAccepted()) {
+        return;
+    }
+qDebug() <<  focusObject << binary;
+// ## Fixme: Check if keyboard present
+// ## Fixme: Check if running using PSAPI?
+    // Launch via QDesktopServices since using QProcess causes an UAC prompt.
+    static  int n = 0;
+    if (!n++)
+        qDebug() <<     QDesktopServices::openUrl(binary);
+}
+
 QWindowsKeyMapper::QWindowsKeyMapper()
     : m_useRTLExtensions(false), m_keyGrabber(0)
 {
@@ -96,6 +126,8 @@ QWindowsKeyMapper::QWindowsKeyMapper()
     QGuiApplication *app = static_cast<QGuiApplication *>(QGuiApplication::instance());
     QObject::connect(app, &QGuiApplication::applicationStateChanged,
                      app, clearKeyRecorderOnApplicationInActive);
+    QObject::connect(app, &QGuiApplication::focusObjectChanged,
+                     app, startSoftwareKeyboard);
 }
 
 QWindowsKeyMapper::~QWindowsKeyMapper()
-- 
2.8.1.windows.1