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      1 /*
      2  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  */
     19 
     20 #include "config.h"
     21 
     22 #if ENABLE(SVG)
     23 #include "RenderSVGShadowTreeRootContainer.h"
     24 
     25 #include "MouseEvent.h"
     26 #include "SVGShadowTreeElements.h"
     27 #include "SVGUseElement.h"
     28 
     29 namespace WebCore {
     30 
     31 RenderSVGShadowTreeRootContainer::RenderSVGShadowTreeRootContainer(SVGUseElement* node)
     32     : RenderSVGTransformableContainer(node)
     33     , m_recreateTree(false)
     34 {
     35 }
     36 
     37 RenderSVGShadowTreeRootContainer::~RenderSVGShadowTreeRootContainer()
     38 {
     39     if (m_shadowRoot && m_shadowRoot->attached()) {
     40         m_shadowRoot->detach();
     41         m_shadowRoot->clearSVGShadowHost();
     42     }
     43 }
     44 
     45 void RenderSVGShadowTreeRootContainer::updateStyle(Node::StyleChange change)
     46 {
     47     if (m_shadowRoot && m_shadowRoot->attached())
     48         m_shadowRoot->recalcStyle(change);
     49 }
     50 
     51 void RenderSVGShadowTreeRootContainer::updateFromElement()
     52 {
     53     bool hadExistingTree = m_shadowRoot;
     54 
     55     SVGUseElement* useElement = static_cast<SVGUseElement*>(node());
     56     if (!m_shadowRoot) {
     57         ASSERT(!m_recreateTree);
     58         m_shadowRoot = SVGShadowTreeRootElement::create(document(), useElement);
     59         useElement->buildPendingResource();
     60     }
     61 
     62     ASSERT(m_shadowRoot->svgShadowHost() == useElement);
     63 
     64     bool shouldRecreateTree = m_recreateTree;
     65     if (m_recreateTree) {
     66         ASSERT(hadExistingTree);
     67 
     68         if (m_shadowRoot->attached())
     69             m_shadowRoot->detach();
     70 
     71         m_shadowRoot->removeAllChildren();
     72         m_recreateTree = false;
     73     }
     74 
     75     // Only rebuild the shadow tree, if we a) never had a tree or b) we were specifically asked to do so
     76     // If the use element is a pending resource, and a) or b) is true, do nothing, and wait for the use
     77     // element to be asked to buildPendingResource(), this will call us again, with m_recreateTrue=true.
     78     if ((shouldRecreateTree || !hadExistingTree) && !useElement->isPendingResource()) {
     79         useElement->buildShadowAndInstanceTree(m_shadowRoot.get());
     80 
     81         // Attach shadow root element
     82         m_shadowRoot->attachElement(style(), renderArena());
     83 
     84         // Attach subtree, as if it was a regular non-shadow tree
     85         for (Node* child = m_shadowRoot->firstChild(); child; child = child->nextSibling())
     86             child->attach();
     87     }
     88 
     89     ASSERT(!m_recreateTree);
     90     RenderSVGTransformableContainer::updateFromElement();
     91 }
     92 
     93 void RenderSVGShadowTreeRootContainer::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
     94 {
     95     RenderSVGTransformableContainer::styleDidChange(diff, oldStyle);
     96 
     97     if (RenderObject* shadowRootRenderer = m_shadowRoot ? m_shadowRoot->renderer() : 0)
     98         shadowRootRenderer->setStyle(style());
     99 }
    100 
    101 Node* RenderSVGShadowTreeRootContainer::rootElement() const
    102 {
    103     return m_shadowRoot.get();
    104 }
    105 
    106 }
    107 
    108 #endif
    109