/*

    Copyright (C) Research In Motion Limited 2010. 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

    aint 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.

*/

#include "config.h"

#if ENABLE(SVG)

#include "RenderSVGShadowTreeRootContainer.h"

#include "MouseEvent.h"

#include "SVGShadowTreeElements.h"

#include "SVGUseElement.h"

namespace WebCore {

RenderSVGShadowTreeRootContainer::RenderSVGShadowTreeRootContainer(SVGUseElement* node)

    : RenderSVGTransformableContainer(node)

    , m_recreateTree(false)

{

}

RenderSVGShadowTreeRootContainer::~RenderSVGShadowTreeRootContainer()

{

    if (m_shadowRoot && m_shadowRoot->attached())

        m_shadowRoot->detach();

}

void RenderSVGShadowTreeRootContainer::updateStyle(Node::StyleChange change)

{

    if (m_shadowRoot && m_shadowRoot->attached())

        m_shadowRoot->recalcStyle(change);

}

void RenderSVGShadowTreeRootContainer::updateFromElement()

{

    bool hadExistingTree = m_shadowRoot;

    SVGUseElement* useElement = static_cast<SVGUseElement*>(node());

    if (!m_shadowRoot) {

        ASSERT(!m_recreateTree);

        m_shadowRoot = new SVGShadowTreeRootElement(document(), useElement);

        useElement->buildPendingResource();

    }

    ASSERT(m_shadowRoot->shadowParentNode() == useElement);

    bool shouldRecreateTree = m_recreateTree;

    if (m_recreateTree) {

        ASSERT(hadExistingTree);

        if (m_shadowRoot->attached())

            m_shadowRoot->detach();

        m_shadowRoot->removeAllChildren();

        m_recreateTree = false;

    }

    // Only rebuild the shadow tree, if we a) never had a tree or b) we were specifically asked to do so

    // If the use element is a pending resource, and a) or b) is true, do nothing, and wait for the use

    // element to be asked to buildPendingResource(), this will call us again, with m_recreateTrue=true.

    if ((shouldRecreateTree || !hadExistingTree) && !useElement->isPendingResource()) {

        useElement->buildShadowAndInstanceTree(m_shadowRoot.get());

        // Attach shadow root element

        m_shadowRoot->attachElement(style(), renderArena());

        // Attach subtree, as if it was a regular non-shadow tree

        for (Node* child = m_shadowRoot->firstChild(); child; child = child->nextSibling())

            child->attach();

    }

    ASSERT(!m_recreateTree);

    RenderSVGTransformableContainer::updateFromElement();

}

void RenderSVGShadowTreeRootContainer::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)

{

    RenderSVGTransformableContainer::styleDidChange(diff, oldStyle);

    if (RenderObject* shadowRootRenderer = m_shadowRoot ? m_shadowRoot->renderer() : 0)

        shadowRootRenderer->setStyle(style());

}

Node* RenderSVGShadowTreeRootContainer::rootElement() const

{

    return m_shadowRoot.get();

}

}

#endif