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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2001 Dirk Mueller (mueller (at) kde.org)
      5  * Copyright (C) 2003, 2010 Apple Inc. All rights reserved.
      6  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  */
     22 
     23 #include "config.h"
     24 #include "core/html/HTMLTitleElement.h"
     25 
     26 #include "HTMLNames.h"
     27 #include "bindings/v8/ExceptionStatePlaceholder.h"
     28 #include "core/dom/Document.h"
     29 #include "core/dom/Text.h"
     30 #include "core/rendering/style/RenderStyle.h"
     31 #include "core/rendering/style/StyleInheritedData.h"
     32 #include "wtf/text/StringBuilder.h"
     33 
     34 namespace WebCore {
     35 
     36 using namespace HTMLNames;
     37 
     38 inline HTMLTitleElement::HTMLTitleElement(const QualifiedName& tagName, Document* document)
     39     : HTMLElement(tagName, document)
     40 {
     41     ASSERT(hasTagName(titleTag));
     42     setHasCustomStyleCallbacks();
     43     ScriptWrappable::init(this);
     44 }
     45 
     46 PassRefPtr<HTMLTitleElement> HTMLTitleElement::create(const QualifiedName& tagName, Document* document)
     47 {
     48     return adoptRef(new HTMLTitleElement(tagName, document));
     49 }
     50 
     51 Node::InsertionNotificationRequest HTMLTitleElement::insertedInto(ContainerNode* insertionPoint)
     52 {
     53     HTMLElement::insertedInto(insertionPoint);
     54     if (inDocument() && !isInShadowTree())
     55         document()->setTitleElement(textWithDirection(), this);
     56     return InsertionDone;
     57 }
     58 
     59 void HTMLTitleElement::removedFrom(ContainerNode* insertionPoint)
     60 {
     61     HTMLElement::removedFrom(insertionPoint);
     62     if (insertionPoint->inDocument() && !insertionPoint->isInShadowTree())
     63         document()->removeTitle(this);
     64 }
     65 
     66 void HTMLTitleElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
     67 {
     68     HTMLElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
     69     if (inDocument() && !isInShadowTree())
     70         document()->setTitleElement(textWithDirection(), this);
     71 }
     72 
     73 void HTMLTitleElement::attach(const AttachContext& context)
     74 {
     75     HTMLElement::attach(context);
     76     // If after attaching nothing called styleForRenderer() on this node we
     77     // manually cache the value. This happens if our parent doesn't have a
     78     // renderer like <optgroup> or if it doesn't allow children like <select>.
     79     if (!m_style)
     80         updateNonRenderStyle();
     81 }
     82 
     83 void HTMLTitleElement::detach(const AttachContext& context)
     84 {
     85     m_style.clear();
     86     HTMLElement::detach(context);
     87 }
     88 
     89 void HTMLTitleElement::updateNonRenderStyle()
     90 {
     91     m_style = document()->styleForElementIgnoringPendingStylesheets(this);
     92 }
     93 
     94 RenderStyle* HTMLTitleElement::nonRendererStyle() const
     95 {
     96     return m_style.get();
     97 }
     98 
     99 PassRefPtr<RenderStyle> HTMLTitleElement::customStyleForRenderer()
    100 {
    101     // styleForRenderer is called whenever a new style should be associated
    102     // with an Element so now is a good time to update our cached style.
    103     updateNonRenderStyle();
    104     return m_style;
    105 }
    106 
    107 void HTMLTitleElement::didRecalcStyle(StyleChange)
    108 {
    109     if (isInShadowTree())
    110         return;
    111 
    112     document()->setTitleElement(textWithDirection(), this);
    113 }
    114 
    115 String HTMLTitleElement::text() const
    116 {
    117     StringBuilder result;
    118 
    119     for (Node *n = firstChild(); n; n = n->nextSibling()) {
    120         if (n->isTextNode())
    121             result.append(toText(n)->data());
    122     }
    123 
    124     return result.toString();
    125 }
    126 
    127 StringWithDirection HTMLTitleElement::textWithDirection()
    128 {
    129     TextDirection direction = LTR;
    130     if (m_style)
    131         direction = m_style->direction();
    132     return StringWithDirection(text(), direction);
    133 }
    134 
    135 void HTMLTitleElement::setText(const String &value)
    136 {
    137     RefPtr<Node> protectFromMutationEvents(this);
    138 
    139     int numChildren = childNodeCount();
    140 
    141     if (numChildren == 1 && firstChild()->isTextNode())
    142         toText(firstChild())->setData(value);
    143     else {
    144         // We make a copy here because entity of "value" argument can be Document::m_title,
    145         // which goes empty during removeChildren() invocation below,
    146         // which causes HTMLTitleElement::childrenChanged(), which ends up Document::setTitle().
    147         String valueCopy(value);
    148 
    149         if (numChildren > 0)
    150             removeChildren();
    151 
    152         appendChild(document()->createTextNode(valueCopy.impl()), IGNORE_EXCEPTION);
    153     }
    154 }
    155 
    156 }
    157