Menu & MenuItem: use widgets as a fallback

This makes context menus available on Windows and KDE. One more reason
to keep the module experimental. In the long run, platforms should
implement QPA menus so that we can remove the undesired dependency.

Change-Id: Ifd2d1e92512a05a95d3e7e7e7c00d712e06ce0cb
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>

1 files changed, 199 insertions, 0 deletions

diff --git a/src/imports/platform/widgets/qwidgetplatformmenu.cpp b/src/imports/platform/widgets/qwidgetplatformmenu.cpp
new file mode 100644
index 00000000..a3faafa0
--- /dev/null
+++ b/src/imports/platform/widgets/qwidgetplatformmenu.cpp
@@ -0,0 +1,199 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Labs Platform module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwidgetplatformmenu_p.h"
+#include "qwidgetplatformmenuitem_p.h"
+#include "qwidgetplatform_p.h"
+
+#include <QtGui/qwindow.h>
+#include <QtWidgets/qmenu.h>
+#include <QtWidgets/qaction.h>
+
+QT_BEGIN_NAMESPACE
+
+QWidgetPlatformMenu::QWidgetPlatformMenu(QObject *parent)
+{
+    setParent(parent);
+
+    static bool available = QWidgetPlatform::isAvailable("menu");
+    if (available) {
+        m_menu.reset(new QMenu);
+        connect(m_menu.data(), &QMenu::aboutToShow, this, &QPlatformMenu::aboutToShow);
+        connect(m_menu.data(), &QMenu::aboutToHide, this, &QPlatformMenu::aboutToHide);
+    }
+}
+
+QWidgetPlatformMenu::~QWidgetPlatformMenu()
+{
+}
+
+QMenu *QWidgetPlatformMenu::menu() const
+{
+    return m_menu.data();
+}
+
+void QWidgetPlatformMenu::insertMenuItem(QPlatformMenuItem *item, QPlatformMenuItem *before)
+{
+    QWidgetPlatformMenuItem *widgetItem = qobject_cast<QWidgetPlatformMenuItem *>(item);
+    if (!widgetItem || !m_menu)
+        return;
+
+    QWidgetPlatformMenuItem *widgetBefore = qobject_cast<QWidgetPlatformMenuItem *>(before);
+    m_menu->insertAction(widgetBefore ? widgetBefore->action() : nullptr, widgetItem->action());
+}
+
+void QWidgetPlatformMenu::removeMenuItem(QPlatformMenuItem *item)
+{
+    QWidgetPlatformMenuItem *widgetItem = qobject_cast<QWidgetPlatformMenuItem *>(item);
+    if (!widgetItem || !m_menu)
+        return;
+
+    m_menu->removeAction(widgetItem->action());
+}
+
+void QWidgetPlatformMenu::syncMenuItem(QPlatformMenuItem *item)
+{
+    Q_UNUSED(item);
+}
+
+void QWidgetPlatformMenu::syncSeparatorsCollapsible(bool enable)
+{
+    Q_UNUSED(enable);
+}
+
+quintptr QWidgetPlatformMenu::tag() const
+{
+    return 0;
+}
+
+void QWidgetPlatformMenu::setTag(quintptr tag)
+{
+    Q_UNUSED(tag);
+}
+
+void QWidgetPlatformMenu::setText(const QString &text)
+{
+    if (m_menu)
+        m_menu->setTitle(text);
+}
+
+void QWidgetPlatformMenu::setIcon(const QIcon &icon)
+{
+    if (m_menu)
+        m_menu->setIcon(icon);
+}
+
+void QWidgetPlatformMenu::setEnabled(bool enabled)
+{
+    if (m_menu)
+        m_menu->menuAction()->setEnabled(enabled);
+}
+
+bool QWidgetPlatformMenu::isEnabled() const
+{
+    return m_menu && m_menu->menuAction()->isEnabled();
+}
+
+void QWidgetPlatformMenu::setVisible(bool visible)
+{
+    if (m_menu)
+        m_menu->menuAction()->setVisible(visible);
+}
+
+void QWidgetPlatformMenu::setMinimumWidth(int width)
+{
+    if (m_menu && width > 0)
+        m_menu->setMinimumWidth(width);
+}
+
+void QWidgetPlatformMenu::setFont(const QFont &font)
+{
+    if (m_menu)
+        m_menu->setFont(font);
+}
+
+void QWidgetPlatformMenu::setMenuType(MenuType type)
+{
+    Q_UNUSED(type);
+}
+
+void QWidgetPlatformMenu::showPopup(const QWindow *window, const QRect &targetRect, const QPlatformMenuItem *item)
+{
+    if (!m_menu)
+        return;
+
+    m_menu->createWinId();
+    QWindow *handle = m_menu->windowHandle();
+    Q_ASSERT(handle);
+    handle->setTransientParent(const_cast<QWindow *>(window));
+
+    QPoint targetPos = targetRect.bottomLeft();
+    if (window)
+        targetPos = window->mapToGlobal(targetPos);
+
+    const QWidgetPlatformMenuItem *widgetItem = qobject_cast<const QWidgetPlatformMenuItem *>(item);
+    m_menu->popup(targetPos, widgetItem ? widgetItem->action() : nullptr);
+}
+
+void QWidgetPlatformMenu::dismiss()
+{
+    if (m_menu)
+        m_menu->close();
+}
+
+QPlatformMenuItem *QWidgetPlatformMenu::menuItemAt(int position) const
+{
+    Q_UNUSED(position);
+    return nullptr;
+}
+
+QPlatformMenuItem *QWidgetPlatformMenu::menuItemForTag(quintptr tag) const
+{
+    Q_UNUSED(tag);
+    return nullptr;
+}
+
+QPlatformMenuItem *QWidgetPlatformMenu::createMenuItem() const
+{
+    return nullptr;
+}
+
+QPlatformMenu *QWidgetPlatformMenu::createSubMenu() const
+{
+    return nullptr;
+}
+
+QT_END_NAMESPACE