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      1 /*
      2  * Copyright (C) 2010, 2011 Nokia Corporation and/or its subsidiary(-ies)
      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 
     21 #include "config.h"
     22 #include "HTMLDetailsElement.h"
     23 
     24 #include "HTMLNames.h"
     25 #include "HTMLSummaryElement.h"
     26 #include "LocalizedStrings.h"
     27 #include "MouseEvent.h"
     28 #include "RenderDetails.h"
     29 #include "Text.h"
     30 
     31 namespace WebCore {
     32 
     33 using namespace HTMLNames;
     34 
     35 PassRefPtr<HTMLDetailsElement> HTMLDetailsElement::create(const QualifiedName& tagName, Document* document)
     36 {
     37     return adoptRef(new HTMLDetailsElement(tagName, document));
     38 }
     39 
     40 HTMLDetailsElement::HTMLDetailsElement(const QualifiedName& tagName, Document* document)
     41     : HTMLElement(tagName, document)
     42     , m_mainSummary(0)
     43     , m_isOpen(false)
     44 {
     45     ASSERT(hasTagName(detailsTag));
     46 }
     47 
     48 RenderObject* HTMLDetailsElement::createRenderer(RenderArena* arena, RenderStyle*)
     49 {
     50     return new (arena) RenderDetails(this);
     51 }
     52 
     53 Node* HTMLDetailsElement::findSummaryFor(ContainerNode* container)
     54 {
     55     for (Node* child = container->firstChild(); child; child = child->nextSibling()) {
     56         if (child->hasTagName(summaryTag))
     57             return child;
     58     }
     59 
     60     return 0;
     61 }
     62 
     63 Node* HTMLDetailsElement::findMainSummary()
     64 {
     65     Node* found = findSummaryFor(this);
     66     if (found) {
     67         removeShadowRoot();
     68         return found;
     69     }
     70 
     71     createShadowSubtree();
     72     found = findSummaryFor(shadowRoot());
     73     ASSERT(found);
     74     return found;
     75 }
     76 
     77 void HTMLDetailsElement::refreshMainSummary(RefreshRenderer refreshRenderer)
     78 {
     79     RefPtr<Node> oldSummary = m_mainSummary;
     80     m_mainSummary = findMainSummary();
     81 
     82     if (oldSummary == m_mainSummary || !attached())
     83         return;
     84 
     85     if (oldSummary && oldSummary->parentNodeForRenderingAndStyle()) {
     86         oldSummary->detach();
     87         oldSummary->attach();
     88     }
     89 
     90     if (refreshRenderer == RefreshRendererAllowed) {
     91         m_mainSummary->detach();
     92         m_mainSummary->attach();
     93     }
     94 }
     95 
     96 void HTMLDetailsElement::createShadowSubtree()
     97 {
     98     if (shadowRoot())
     99         return;
    100 
    101     RefPtr<HTMLSummaryElement> defaultSummary = HTMLSummaryElement::create(summaryTag, document());
    102     ExceptionCode ec = 0;
    103     defaultSummary->appendChild(Text::create(document(), defaultDetailsSummaryText()), ec);
    104     ensureShadowRoot()->appendChild(defaultSummary, ec, true);
    105 }
    106 
    107 
    108 void HTMLDetailsElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
    109 {
    110     HTMLElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
    111     // If childCountDelta is less then zero and the main summary has changed it must be because previous main
    112     // summary was removed. The new main summary was then inside the unrevealed content and needs to be
    113     // reattached to create its renderer. If childCountDelta is not less then zero then a new <summary> element
    114     // has been added and it will be attached without our help.
    115     if (!changedByParser)
    116         refreshMainSummary(childCountDelta < 0 ? RefreshRendererAllowed : RefreshRendererSupressed);
    117 }
    118 
    119 void HTMLDetailsElement::finishParsingChildren()
    120 {
    121     HTMLElement::finishParsingChildren();
    122     refreshMainSummary(RefreshRendererAllowed);
    123 }
    124 
    125 void HTMLDetailsElement::parseMappedAttribute(Attribute* attr)
    126 {
    127     if (attr->name() == openAttr) {
    128         bool oldValue = m_isOpen;
    129         m_isOpen =  !attr->value().isNull();
    130         if (attached() && oldValue != m_isOpen) {
    131             detach();
    132             attach();
    133         }
    134     } else
    135         HTMLElement::parseMappedAttribute(attr);
    136 }
    137 
    138 bool HTMLDetailsElement::childShouldCreateRenderer(Node* child) const
    139 {
    140     return m_isOpen || child == m_mainSummary;
    141 }
    142 
    143 void HTMLDetailsElement::toggleOpen()
    144 {
    145     setAttribute(openAttr, m_isOpen ? nullAtom : emptyAtom);
    146 }
    147 
    148 }
    149