Source/core/rendering/RenderSelectionInfo.h

/*
 * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
 *           (C) 2000 Antti Koivisto (koivisto@kde.org)
 *           (C) 2000 Dirk Mueller (mueller@kde.org)
 *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 RenderSelectionInfo_h
#define RenderSelectionInfo_h

#include "core/rendering/RenderBox.h"
#include "platform/geometry/IntRect.h"

namespace blink {

class RenderSelectionInfoBase : public NoBaseWillBeGarbageCollected<RenderSelectionInfoBase> {
    WTF_MAKE_NONCOPYABLE(RenderSelectionInfoBase); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
public:
    RenderSelectionInfoBase(RenderObject* o)
        : m_object(o)
        , m_paintInvalidationContainer(o->isRooted() ? o->containerForPaintInvalidation() : nullptr)
        , m_state(o->selectionState())
    {
    }

    void trace(Visitor* visitor)
    {
        visitor->trace(m_object);
        visitor->trace(m_paintInvalidationContainer);
    }

    RenderObject* object() const { return m_object.get(); }

protected:
    RawPtrWillBeMember<RenderObject> m_object;
    RawPtrWillBeMember<const RenderLayerModelObject> m_paintInvalidationContainer;
    RenderObject::SelectionState m_state;
};

// This struct is used when the selection changes to cache the old and new state of the selection for each RenderObject.
class RenderSelectionInfo final : public RenderSelectionInfoBase {
public:
    RenderSelectionInfo(RenderObject* o)
        : RenderSelectionInfoBase(o)
    {
        if (m_paintInvalidationContainer && o->canUpdateSelectionOnRootLineBoxes()) {
            m_rect = o->selectionRectForPaintInvalidation(m_paintInvalidationContainer);
            // FIXME: groupedMapping() leaks the squashing abstraction. See RenderBlockSelectionInfo for more details.
            if (m_paintInvalidationContainer->layer()->groupedMapping())
                RenderLayer::mapRectToPaintBackingCoordinates(m_paintInvalidationContainer, m_rect);
        } else {
            m_rect = LayoutRect();
        }
    }

    LayoutRect absoluteSelectionRect() const
    {
        if (!m_paintInvalidationContainer)
            return LayoutRect();

        FloatQuad absQuad = m_paintInvalidationContainer->localToAbsoluteQuad(FloatRect(m_rect));
        return absQuad.enclosingBoundingBox();
    }

private:
    LayoutRect m_rect; // relative to paint invalidation container
};

} // namespace blink


#endif // RenderSelectionInfo_h