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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     aint 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 }
     42 
     43 void RenderSVGShadowTreeRootContainer::updateStyle(Node::StyleChange change)
     44 {
     45     if (m_shadowRoot && m_shadowRoot->attached())
     46         m_shadowRoot->recalcStyle(change);
     47 }
     48 
     49 void RenderSVGShadowTreeRootContainer::updateFromElement()
     50 {
     51     bool hadExistingTree = m_shadowRoot;
     52 
     53     SVGUseElement* useElement = static_cast<SVGUseElement*>(node());
     54     if (!m_shadowRoot) {
     55         ASSERT(!m_recreateTree);
     56         m_shadowRoot = new SVGShadowTreeRootElement(document(), useElement);
     57         useElement->buildPendingResource();
     58     }
     59 
     60     ASSERT(m_shadowRoot->shadowParentNode() == useElement);
     61 
     62     bool shouldRecreateTree = m_recreateTree;
     63     if (m_recreateTree) {
     64         ASSERT(hadExistingTree);
     65 
     66         if (m_shadowRoot->attached())
     67             m_shadowRoot->detach();
     68 
     69         m_shadowRoot->removeAllChildren();
     70         m_recreateTree = false;
     71     }
     72 
     73     // Only rebuild the shadow tree, if we a) never had a tree or b) we were specifically asked to do so
     74     // If the use element is a pending resource, and a) or b) is true, do nothing, and wait for the use
     75     // element to be asked to buildPendingResource(), this will call us again, with m_recreateTrue=true.
     76     if ((shouldRecreateTree || !hadExistingTree) && !useElement->isPendingResource()) {
     77         useElement->buildShadowAndInstanceTree(m_shadowRoot.get());
     78 
     79         // Attach shadow root element
     80         m_shadowRoot->attachElement(style(), renderArena());
     81 
     82         // Attach subtree, as if it was a regular non-shadow tree
     83         for (Node* child = m_shadowRoot->firstChild(); child; child = child->nextSibling())
     84             child->attach();
     85     }
     86 
     87     ASSERT(!m_recreateTree);
     88     RenderSVGTransformableContainer::updateFromElement();
     89 }
     90 
     91 void RenderSVGShadowTreeRootContainer::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
     92 {
     93     RenderSVGTransformableContainer::styleDidChange(diff, oldStyle);
     94 
     95     if (RenderObject* shadowRootRenderer = m_shadowRoot ? m_shadowRoot->renderer() : 0)
     96         shadowRootRenderer->setStyle(style());
     97 }
     98 
     99 }
    100 
    101 #endif
    102