/****************************************************************************
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** Copyright (C) 2016 The Qt Company Ltd.
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**
** This file is part of the QtWebEngine module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
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#ifndef RENDER_WIDGET_HOST_VIEW_QT_DELEGATE_WIDGET_H
#define RENDER_WIDGET_HOST_VIEW_QT_DELEGATE_WIDGET_H

#include "render_widget_host_view_qt_delegate.h"
#include "web_contents_adapter_client.h"

#include <QAccessibleWidget>
#include <QQuickItem>
#include <QQuickWidget>

QT_BEGIN_NAMESPACE
class QWebEnginePage;
class QWebEngineView;
class QWebEngineViewAccessible;
class QWebEnginePagePrivate;
QT_END_NAMESPACE

namespace QtWebEngineCore {

// Useful information keyboard and mouse QEvent propagation.
// A RenderWidgetHostViewQtDelegateWidget instance initialized as a popup will receive
// no keyboard focus (so all keyboard QEvents will be sent to the parent RWHVQD instance),
// but will still receive mouse input (all mouse QEvent moves and clicks will be given to the popup
// RWHVQD instance, and the mouse interaction area covers the surface of the whole parent
// QWebEngineView, and not only the smaller surface that an HTML select popup would occupy).
class RenderWidgetHostViewQtDelegateWidget : public QQuickWidget, public RenderWidgetHostViewQtDelegate {
    Q_OBJECT
public:
    RenderWidgetHostViewQtDelegateWidget(RenderWidgetHostViewQtDelegateClient *client, QWidget *parent = 0);
    ~RenderWidgetHostViewQtDelegateWidget();

    void initAsPopup(const QRect&) override;
    QRectF viewGeometry() const override;
    QRect windowGeometry() const override;
    void setKeyboardFocus() override;
    bool hasKeyboardFocus() override;
    void lockMouse() override;
    void unlockMouse() override;
    void show() override;
    void hide() override;
    bool isVisible() const override;
    QWindow* window() const override;
    QSGTexture *createTextureFromImage(const QImage &) override;
    QSGLayer *createLayer() override;
    QSGImageNode *createImageNode() override;
    QSGRectangleNode *createRectangleNode() override;
    void update() override;
    void updateCursor(const QCursor &) override;
    void resize(int width, int height) override;
    void move(const QPoint &screenPos) override;
    void inputMethodStateChanged(bool editorVisible, bool passwordInput) override;
    void setInputMethodHints(Qt::InputMethodHints) override;
    void setClearColor(const QColor &color) override;
    bool copySurface(const QRect &, const QSize &, QImage &) override;
    void unhandledWheelEvent(QWheelEvent *ev) override;

protected:
    bool event(QEvent *event) override;
    void resizeEvent(QResizeEvent *resizeEvent) override;
    void showEvent(QShowEvent *) override;
    void hideEvent(QHideEvent *) override;
    void closeEvent(QCloseEvent *event) override;

    QVariant inputMethodQuery(Qt::InputMethodQuery query) const override;

private slots:
    void onWindowPosChanged();
    void connectRemoveParentBeforeParentDelete();
    void removeParentBeforeParentDelete();

private:
    friend QWebEnginePagePrivate;

    RenderWidgetHostViewQtDelegateClient *m_client;
    QScopedPointer<QQuickItem> m_rootItem;
    bool m_isPopup;
    QColor m_clearColor;
    QList<QMetaObject::Connection> m_windowConnections;
    QWebEnginePage *m_page = nullptr;
    QMetaObject::Connection m_parentDestroyedConnection;
};

#if QT_CONFIG(accessibility)
class RenderWidgetHostViewQtDelegateWidgetAccessible : public QAccessibleWidget
{
public:
    RenderWidgetHostViewQtDelegateWidgetAccessible(RenderWidgetHostViewQtDelegateWidget *o, QWebEngineView *view);

    bool isValid() const override;
    QAccessibleInterface *focusChild() const override;
    int childCount() const override;
    QAccessibleInterface *child(int index) const override;
    int indexOfChild(const QAccessibleInterface *child) const override;

private:
    QWebEngineViewAccessible *viewAccessible() const;
    QWebEngineView *m_view;
};
#endif // QT_CONFIG(accessibility)

} // namespace QtWebEngineCore

#endif