Propagate unhandled key events to the QtWebEngine view's parent

This allows applications to receive unhandled key events from the page
by setting an event handler on the view's parent widget/item, like
it was possible with QtWebKit.

This is different in that events first have to asynchronously go
through the QtWebEngineProcess. If the WebEngine view has the
keyboard focus, the events will be consumed inconditionally by the
RenderWidgetHostViewQtDelegates, and a copy will be resent to the
view's parent if it wasn't consumed.

This sends it to the parent instead of the QWebEngineView directly
since those are only unhandled events, unlike with other widgets
where you can first intercept events. It is done that way also in
cases where the QWebEngineView would be be the focus widget directly
in the future, instead of the RWHV.

If applications want to intercept key events before they reach the
page, they need to use an event filter on the QWebEngineView's
children or globally on the application.

Change-Id: I3b48f5212d3f238a1c0497cec1db6ae3badbad26
Reviewed-by: Andras Becsi <andras.becsi@theqtcompany.com>

1 files changed, 97 insertions, 0 deletions

diff --git a/src/core/native_web_keyboard_event_qt.cpp b/src/core/native_web_keyboard_event_qt.cpp
new file mode 100644
index 000000000..072b4dd9d
--- /dev/null
+++ b/src/core/native_web_keyboard_event_qt.cpp
@@ -0,0 +1,97 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/public/browser/native_web_keyboard_event.h"
+#include <QKeyEvent>
+
+namespace {
+
+// We need to copy |os_event| in NativeWebKeyboardEvent because it is
+// queued in RenderWidgetHost and may be passed and used
+// RenderViewHostDelegate::HandledKeybardEvent after the original aura
+// event is destroyed.
+gfx::NativeEvent CopyEvent(gfx::NativeEvent event)
+{
+    return event ? reinterpret_cast<gfx::NativeEvent>(new QKeyEvent(*reinterpret_cast<QKeyEvent*>(event))) : 0;
+}
+
+void DestroyEvent(gfx::NativeEvent event)
+{
+    delete reinterpret_cast<QKeyEvent*>(event);
+}
+
+}  // namespace
+
+using blink::WebKeyboardEvent;
+
+namespace content {
+
+NativeWebKeyboardEvent::NativeWebKeyboardEvent()
+    : os_event(0),
+      skip_in_browser(false)
+{
+}
+
+NativeWebKeyboardEvent::NativeWebKeyboardEvent(gfx::NativeEvent native_event)
+    : os_event(CopyEvent(native_event)),
+      skip_in_browser(false)
+{
+}
+
+NativeWebKeyboardEvent::NativeWebKeyboardEvent(const NativeWebKeyboardEvent& other)
+    : WebKeyboardEvent(other),
+    os_event(CopyEvent(other.os_event)),
+    skip_in_browser(other.skip_in_browser)
+{
+}
+
+NativeWebKeyboardEvent& NativeWebKeyboardEvent::operator=(const NativeWebKeyboardEvent& other) {
+    WebKeyboardEvent::operator=(other);
+    DestroyEvent(os_event);
+    os_event = CopyEvent(other.os_event);
+    skip_in_browser = other.skip_in_browser;
+    return *this;
+}
+
+NativeWebKeyboardEvent::~NativeWebKeyboardEvent() {
+    DestroyEvent(os_event);
+}
+
+}  // namespace content