/*
   Copyright (C) 1997 Martin Jones (mjones@kde.org)
             (C) 1998 Waldo Bastian (bastian@kde.org)
             (C) 1998, 1999 Torben Weis (weis@kde.org)
             (C) 1999 Lars Knoll (knoll@kde.org)
             (C) 1999 Antti Koivisto (koivisto@kde.org)
   Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#ifndef FrameView_h
#define FrameView_h

#include "ScrollView.h"
#include "IntSize.h"
#include <wtf/Forward.h>
#include <wtf/OwnPtr.h>

namespace WebCore {

class Color;
class Event;
class EventTargetNode;
class Frame;
class FrameViewPrivate;
class IntRect;
class PlatformMouseEvent;
class Node;
class RenderLayer;
class RenderObject;
class RenderPartObject;
class String;

template <typename T> class Timer;

class FrameView : public ScrollView {
public:
    FrameView(Frame*);

    // On the Mac, FrameViews always get their size from the underlying NSView,
    // so passing in a size is nonsensical.
#if !PLATFORM(MAC)
    FrameView(Frame*, const IntSize& initialSize);
#endif

    virtual ~FrameView();

    Frame* frame() const { return m_frame.get(); }
    void clearFrame();

    void ref() { ++m_refCount; }
    void deref() { if (!--m_refCount) delete this; }
    bool hasOneRef() { return m_refCount == 1; }

    int marginWidth() const { return m_margins.width(); } // -1 means default
    int marginHeight() const { return m_margins.height(); } // -1 means default
    void setMarginWidth(int);
    void setMarginHeight(int);

    virtual void setVScrollbarMode(ScrollbarMode);
    virtual void setHScrollbarMode(ScrollbarMode);
    virtual void setScrollbarsMode(ScrollbarMode);

    void layout(bool allowSubtree = true);
    bool didFirstLayout() const;
    void layoutTimerFired(Timer<FrameView>*);
    void scheduleRelayout();
    void scheduleRelayoutOfSubtree(RenderObject*);
    void unscheduleRelayout();
    bool layoutPending() const;

    RenderObject* layoutRoot(bool onlyDuringLayout = false) const;
    int layoutCount() const;

    // These two helper functions just pass through to the RenderView.
    bool needsLayout() const;
    void setNeedsLayout();

    bool needsFullRepaint() const;
    void repaintRectangle(const IntRect&, bool immediate);

    void resetScrollbars();

    void clear();

    bool isTransparent() const;
    void setTransparent(bool isTransparent);

    Color baseBackgroundColor() const;
    void setBaseBackgroundColor(Color);

    virtual bool shouldUpdateWhileOffscreen() const;
    void setShouldUpdateWhileOffscreen(bool);

    void adjustViewSize();
    void initScrollbars();
    
    virtual IntRect windowClipRect() const;
    IntRect windowClipRect(bool clipToContents) const;
    IntRect windowClipRectForLayer(const RenderLayer*, bool clipToLayerContents) const;

    virtual void scrollRectIntoViewRecursively(const IntRect&);
    virtual void setContentsPos(int x, int y);

    String mediaType() const;
    void setMediaType(const String&);

    void setUseSlowRepaints();

    void addSlowRepaintObject();
    void removeSlowRepaintObject();

    void beginDeferredRepaints();
    void endDeferredRepaints();

#if ENABLE(DASHBOARD_SUPPORT)
    void updateDashboardRegions();
#endif
    void updateControlTints();

    void restoreScrollbar();

    void scheduleEvent(PassRefPtr<Event>, PassRefPtr<EventTargetNode>, bool tempEvent);
    void pauseScheduledEvents();
    void resumeScheduledEvents();
    void postLayoutTimerFired(Timer<FrameView>*);

    bool wasScrolledByUser() const;
    void setWasScrolledByUser(bool);

    void addWidgetToUpdate(RenderPartObject*);
    void removeWidgetToUpdate(RenderPartObject*);

    // FIXME: This function should be used by all platforms, but currently depends on ScrollView::children,
    // which not all platforms have. Once FrameView and ScrollView are merged, this #if should be removed.
#if PLATFORM(WIN) || PLATFORM(GTK) || PLATFORM(QT)
    void layoutIfNeededRecursive();
#endif

private:
    void init();

    virtual bool isFrameView() const;

    bool scrollTo(const IntRect&);

    bool useSlowRepaints() const;

    void applyOverflowToViewport(RenderObject*, ScrollbarMode& hMode, ScrollbarMode& vMode);

    void updateOverflowStatus(bool horizontalOverflow, bool verticalOverflow);

    void dispatchScheduledEvents();
    void performPostLayoutTasks();

    unsigned m_refCount;
    IntSize m_size;
    IntSize m_margins;
    OwnPtr<HashSet<RenderPartObject*> > m_widgetUpdateSet;
    RefPtr<Frame> m_frame;
    FrameViewPrivate* d;
};

}

#endif
