third_party/WebKit/Source/core/html/HTMLTitleElement.cpp

   1 /*
   2  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
   3  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
   4  *           (C) 2001 Dirk Mueller (mueller@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 "bindings/core/v8/ExceptionStatePlaceholder.h"
  27 #include "core/HTMLNames.h"
  28 #include "core/dom/ChildListMutationScope.h"
  29 #include "core/dom/Document.h"
  30 #include "core/dom/Text.h"
  31 #include "core/style/ComputedStyle.h"
  32 #include "core/style/StyleInheritedData.h"
  33 #include "wtf/text/StringBuilder.h"
  34
  35 namespace blink {
  36
  37 using namespace HTMLNames;
  38
  39 inline HTMLTitleElement::HTMLTitleElement(Document& document)
  40     : HTMLElement(titleTag, document)
  41     , m_ignoreTitleUpdatesWhenChildrenChange(false)
  42 {
  43 }
  44
  45 DEFINE_NODE_FACTORY(HTMLTitleElement)
  46
  47 Node::InsertionNotificationRequest HTMLTitleElement::insertedInto(ContainerNode* insertionPoint)
  48 {
  49     HTMLElement::insertedInto(insertionPoint);
  50     if (inDocument() && !isInShadowTree())
  51         document().setTitleElement(this);
  52     return InsertionDone;
  53 }
  54
  55 void HTMLTitleElement::removedFrom(ContainerNode* insertionPoint)
  56 {
  57     HTMLElement::removedFrom(insertionPoint);
  58     if (insertionPoint->inDocument() && !insertionPoint->isInShadowTree())
  59         document().removeTitle(this);
  60 }
  61
  62 void HTMLTitleElement::childrenChanged(const ChildrenChange& change)
  63 {
  64     HTMLElement::childrenChanged(change);
  65     if (inDocument() && !isInShadowTree() && !m_ignoreTitleUpdatesWhenChildrenChange)
  66         document().setTitleElement(this);
  67 }
  68
  69 String HTMLTitleElement::text() const
  70 {
  71     StringBuilder result;
  72
  73     for (Node *n = firstChild(); n; n = n->nextSibling()) {
  74         if (n->isTextNode())
  75             result.append(toText(n)->data());
  76     }
  77
  78     return result.toString();
  79 }
  80
  81 void HTMLTitleElement::setText(const String &value)
  82 {
  83     RefPtrWillBeRawPtr<Node> protectFromMutationEvents(this);
  84     ChildListMutationScope mutation(*this);
  85
  86     // Avoid calling Document::setTitleElement() during intermediate steps.
  87     m_ignoreTitleUpdatesWhenChildrenChange = !value.isEmpty();
  88     removeChildren(OmitSubtreeModifiedEvent);
  89     m_ignoreTitleUpdatesWhenChildrenChange = false;
  90
  91     if (!value.isEmpty())
  92         appendChild(document().createTextNode(value.impl()), IGNORE_EXCEPTION);
  93 }
  94
  95 }