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**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** This file is part of the QtWebEngine module of the Qt Toolkit.
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** use the contact form at http://qt.digia.com/contact-us.
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** 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
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** 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
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****************************************************************************/

#ifndef RENDER_WIDGET_HOST_VIEW_QT_H
#define RENDER_WIDGET_HOST_VIEW_QT_H

#include "render_widget_host_view_qt_delegate.h"

#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "cc/resources/transferable_resource.h"
#include "content/browser/accessibility/browser_accessibility_manager.h"
#include "content/browser/renderer_host/render_widget_host_view_base.h"
#include "ui/events/gesture_detection/filtered_gesture_provider.h"
#include <QPoint>
#include <QRect>
#include <QtGlobal>
#include <QtGui/qaccessible.h>

#include "delegated_frame_node.h"

QT_BEGIN_NAMESPACE
class QEvent;
class QFocusEvent;
class QHoverEvent;
class QKeyEvent;
class QMouseEvent;
class QTouchEvent;
class QVariant;
class QWheelEvent;
class QAccessibleInterface;
QT_END_NAMESPACE

class WebContentsAdapterClient;

namespace content {
class RenderWidgetHostImpl;
}

struct MultipleMouseClickHelper
{
    QPoint lastPressPosition;
    Qt::MouseButton lastPressButton;
    int clickCounter;
    ulong lastPressTimestamp;

    MultipleMouseClickHelper()
        : lastPressPosition(QPoint())
        , lastPressButton(Qt::NoButton)
        , clickCounter(0)
        , lastPressTimestamp(0)
    {
    }
};

class RenderWidgetHostViewQt
    : public content::RenderWidgetHostViewBase
    , public ui::GestureProviderClient
    , public RenderWidgetHostViewQtDelegateClient
    , public content::BrowserAccessibilityDelegate
    , public base::SupportsWeakPtr<RenderWidgetHostViewQt>
    , public QAccessible::ActivationObserver
{
public:
    RenderWidgetHostViewQt(content::RenderWidgetHost* widget);
    ~RenderWidgetHostViewQt();

    void setDelegate(RenderWidgetHostViewQtDelegate *delegate);
    void setAdapterClient(WebContentsAdapterClient *adapterClient);

    virtual void InitAsChild(gfx::NativeView) Q_DECL_OVERRIDE;
    virtual void InitAsPopup(content::RenderWidgetHostView*, const gfx::Rect&) Q_DECL_OVERRIDE;
    virtual void InitAsFullscreen(content::RenderWidgetHostView*) Q_DECL_OVERRIDE;
    virtual content::RenderWidgetHost* GetRenderWidgetHost() const Q_DECL_OVERRIDE;
    virtual void SetSize(const gfx::Size& size) Q_DECL_OVERRIDE;
    virtual void SetBounds(const gfx::Rect&) Q_DECL_OVERRIDE;
    virtual gfx::Size GetPhysicalBackingSize() const Q_DECL_OVERRIDE;
    virtual gfx::NativeView GetNativeView() const Q_DECL_OVERRIDE;
    virtual gfx::NativeViewId GetNativeViewId() const Q_DECL_OVERRIDE;
    virtual gfx::NativeViewAccessible GetNativeViewAccessible() Q_DECL_OVERRIDE;
    virtual void Focus() Q_DECL_OVERRIDE;
    virtual bool HasFocus() const Q_DECL_OVERRIDE;
    virtual bool IsSurfaceAvailableForCopy() const Q_DECL_OVERRIDE;
    virtual void Show() Q_DECL_OVERRIDE;
    virtual void Hide() Q_DECL_OVERRIDE;
    virtual bool IsShowing() Q_DECL_OVERRIDE;
    virtual gfx::Rect GetViewBounds() const Q_DECL_OVERRIDE;
    virtual bool LockMouse() Q_DECL_OVERRIDE;
    virtual void UnlockMouse() Q_DECL_OVERRIDE;
    virtual void WasShown() Q_DECL_OVERRIDE;
    virtual void WasHidden() Q_DECL_OVERRIDE;
    virtual void MovePluginWindows(const std::vector<content::WebPluginGeometry>&) Q_DECL_OVERRIDE;
    virtual void Blur() Q_DECL_OVERRIDE;
    virtual void UpdateCursor(const content::WebCursor&) Q_DECL_OVERRIDE;
    virtual void SetIsLoading(bool) Q_DECL_OVERRIDE;
    virtual void TextInputStateChanged(const ViewHostMsg_TextInputState_Params& params) Q_DECL_OVERRIDE;
    virtual void ImeCancelComposition() Q_DECL_OVERRIDE;
    virtual void ImeCompositionRangeChanged(const gfx::Range&, const std::vector<gfx::Rect>&) Q_DECL_OVERRIDE;
    virtual void RenderProcessGone(base::TerminationStatus, int) Q_DECL_OVERRIDE;
    virtual void Destroy() Q_DECL_OVERRIDE;
    virtual void SetTooltipText(const base::string16 &tooltip_text) Q_DECL_OVERRIDE;
    virtual void SelectionBoundsChanged(const ViewHostMsg_SelectionBounds_Params&) Q_DECL_OVERRIDE;
    virtual void ScrollOffsetChanged() Q_DECL_OVERRIDE;
    virtual void CopyFromCompositingSurface(const gfx::Rect& src_subrect, const gfx::Size& /* dst_size */, const base::Callback<void(bool, const SkBitmap&)>& callback, const SkBitmap::Config config) Q_DECL_OVERRIDE;
    virtual void CopyFromCompositingSurfaceToVideoFrame(const gfx::Rect& src_subrect, const scoped_refptr<media::VideoFrame>& target, const base::Callback<void(bool)>& callback) Q_DECL_OVERRIDE;
    virtual bool CanCopyToVideoFrame() const Q_DECL_OVERRIDE;
    virtual void AcceleratedSurfaceInitialized(int host_id, int route_id) Q_DECL_OVERRIDE;
    virtual void AcceleratedSurfaceBuffersSwapped(const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params, int gpu_host_id) Q_DECL_OVERRIDE;
    virtual void AcceleratedSurfacePostSubBuffer(const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params, int gpu_host_id) Q_DECL_OVERRIDE;
    virtual void AcceleratedSurfaceSuspend() Q_DECL_OVERRIDE;
    virtual void AcceleratedSurfaceRelease() Q_DECL_OVERRIDE;
    virtual bool HasAcceleratedSurface(const gfx::Size&) Q_DECL_OVERRIDE;
    virtual void OnSwapCompositorFrame(uint32 output_surface_id, scoped_ptr<cc::CompositorFrame> frame) Q_DECL_OVERRIDE;
    virtual void GetScreenInfo(blink::WebScreenInfo* results) Q_DECL_OVERRIDE;
    virtual gfx::Rect GetBoundsInRootWindow() Q_DECL_OVERRIDE;
    virtual gfx::GLSurfaceHandle GetCompositingSurface() Q_DECL_OVERRIDE;
    virtual void ProcessAckedTouchEvent(const content::TouchEventWithLatencyInfo &touch, content::InputEventAckState ack_result) Q_DECL_OVERRIDE;

    // Overridden from RenderWidgetHostViewBase.
    virtual void SelectionChanged(const base::string16 &text, size_t offset, const gfx::Range &range) Q_DECL_OVERRIDE;

    // Overridden from ui::GestureProviderClient.
    virtual void OnGestureEvent(const ui::GestureEventData& gesture) Q_DECL_OVERRIDE;

    // Overridden from RenderWidgetHostViewQtDelegateClient.
    virtual QSGNode *updatePaintNode(QSGNode *) Q_DECL_OVERRIDE;
    virtual void notifyResize() Q_DECL_OVERRIDE;
    virtual void windowBoundsChanged() Q_DECL_OVERRIDE;
    virtual void windowChanged() Q_DECL_OVERRIDE;
    virtual bool forwardEvent(QEvent *) Q_DECL_OVERRIDE;
    virtual QVariant inputMethodQuery(Qt::InputMethodQuery query) const Q_DECL_OVERRIDE;

    void handleMouseEvent(QMouseEvent*);
    void handleKeyEvent(QKeyEvent*);
    void handleWheelEvent(QWheelEvent*);
    void handleTouchEvent(QTouchEvent*);
    void handleHoverEvent(QHoverEvent*);
    void handleFocusEvent(QFocusEvent*);
    void handleInputMethodEvent(QInputMethodEvent*);

#if defined(OS_MACOSX)
    virtual void SetTakesFocusOnlyOnMouseDown(bool flag) Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED }
    virtual void SetActive(bool active) Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED }
    virtual bool IsSpeaking() const Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED; return false; }
    virtual void SpeakSelection() Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED }
    virtual bool PostProcessEventForPluginIme(const content::NativeWebKeyboardEvent& event) Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED; return false; }
    virtual void StopSpeaking() Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED }
    virtual void SetWindowVisibility(bool visible) Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED }
    virtual bool SupportsSpeech() const Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED; return false; }
    virtual void ShowDefinitionForSelection() Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED }
    virtual void WindowFrameChanged() Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED }
#endif // defined(OS_MACOSX)

#if defined(OS_ANDROID)
    virtual void ShowDisambiguationPopup(const gfx::Rect&, const SkBitmap&) Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED }
    virtual void HasTouchEventHandlers(bool) Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED }
#endif // defined(OS_ANDROID)

#if defined(OS_WIN)
#if defined(USE_AURA)
    virtual void SetParentNativeViewAccessible(gfx::NativeViewAccessible accessible_parent) Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED }
    virtual gfx::NativeViewId GetParentForWindowlessPlugin() const Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED return gfx::NativeViewId(); }
#else
    virtual void SetClickthroughRegion(SkRegion *) Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED }
    virtual void WillWmDestroy(void) Q_DECL_OVERRIDE { QT_NOT_YET_IMPLEMENTED }
#endif // defined(USE_AURA)
#endif // defined(OS_WIN)

    // Overridden from content::BrowserAccessibilityDelegate
    virtual void AccessibilitySetFocus(int acc_obj_id) Q_DECL_OVERRIDE;
    virtual void AccessibilityDoDefaultAction(int acc_obj_id) Q_DECL_OVERRIDE;
    virtual void AccessibilityShowMenu(int acc_obj_id) Q_DECL_OVERRIDE { }
    virtual void AccessibilityScrollToMakeVisible(int acc_obj_id, gfx::Rect subfocus) Q_DECL_OVERRIDE;
    virtual void AccessibilityScrollToPoint(int acc_obj_id, gfx::Point point) Q_DECL_OVERRIDE;
    virtual void AccessibilitySetTextSelection(int acc_obj_id, int start_offset, int end_offset) Q_DECL_OVERRIDE;
    virtual bool AccessibilityViewHasFocus() const Q_DECL_OVERRIDE;
    virtual gfx::Rect AccessibilityGetViewBounds() const Q_DECL_OVERRIDE  { return GetViewBounds(); }
    virtual gfx::Point AccessibilityOriginInScreen(const gfx::Rect& bounds) const Q_DECL_OVERRIDE  { return gfx::Point(); }
    virtual void AccessibilityHitTest(const gfx::Point& point) Q_DECL_OVERRIDE  { }
    virtual void AccessibilityFatalError() Q_DECL_OVERRIDE;
    virtual void accessibilityActiveChanged(bool active) Q_DECL_OVERRIDE;

    QAccessibleInterface *GetQtAccessible();

    void didFirstVisuallyNonEmptyLayout();

private:
    void sendDelegatedFrameAck();
    void processMotionEvent(const ui::MotionEvent &motionEvent);
    float dpiScale() const;

    bool IsPopup() const;
    void CreateBrowserAccessibilityManagerIfNeeded();

    content::RenderWidgetHostImpl *m_host;
    ui::FilteredGestureProvider m_gestureProvider;
    base::TimeDelta m_eventsToNowDelta;
    bool m_sendMotionActionDown;
    scoped_ptr<RenderWidgetHostViewQtDelegate> m_delegate;

    QExplicitlySharedDataPointer<DelegatedFrameNodeData> m_frameNodeData;
    cc::ReturnedResourceArray m_resourcesToRelease;
    bool m_needsDelegatedFrameAck;
    bool m_didFirstVisuallyNonEmptyLayout;
    uint32 m_pendingOutputSurfaceId;

    WebContentsAdapterClient *m_adapterClient;
    MultipleMouseClickHelper m_clickHelper;

    ui::TextInputType m_currentInputType;
    QRect m_cursorRect;
    size_t m_anchorPositionWithinSelection;
    size_t m_cursorPositionWithinSelection;

    bool m_initPending;
};

#endif // RENDER_WIDGET_HOST_VIEW_QT_H