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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 "HTMLTitleElement.h"
     25 
     26 #include "Document.h"
     27 #include "HTMLNames.h"
     28 #include "RenderStyle.h"
     29 #include "Text.h"
     30 
     31 namespace WebCore {
     32 
     33 using namespace HTMLNames;
     34 
     35 inline HTMLTitleElement::HTMLTitleElement(const QualifiedName& tagName, Document* document)
     36     : HTMLElement(tagName, document)
     37 {
     38     ASSERT(hasTagName(titleTag));
     39 }
     40 
     41 PassRefPtr<HTMLTitleElement> HTMLTitleElement::create(const QualifiedName& tagName, Document* document)
     42 {
     43     return adoptRef(new HTMLTitleElement(tagName, document));
     44 }
     45 
     46 void HTMLTitleElement::insertedIntoDocument()
     47 {
     48     HTMLElement::insertedIntoDocument();
     49     document()->setTitleElement(m_title, this);
     50 }
     51 
     52 void HTMLTitleElement::removedFromDocument()
     53 {
     54     HTMLElement::removedFromDocument();
     55     document()->removeTitle(this);
     56 }
     57 
     58 void HTMLTitleElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
     59 {
     60     m_title = textWithDirection();
     61     if (inDocument())
     62         document()->setTitleElement(m_title, this);
     63     HTMLElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
     64 }
     65 
     66 String HTMLTitleElement::text() const
     67 {
     68     String val = "";
     69 
     70     for (Node *n = firstChild(); n; n = n->nextSibling()) {
     71         if (n->isTextNode())
     72             val += static_cast<Text*>(n)->data();
     73     }
     74 
     75     return val;
     76 }
     77 
     78 StringWithDirection HTMLTitleElement::textWithDirection()
     79 {
     80     TextDirection direction = LTR;
     81     if (RenderStyle* style = computedStyle())
     82         direction = style->direction();
     83     else if (RefPtr<RenderStyle> style = styleForRenderer())
     84         direction = style->direction();
     85     return StringWithDirection(text(), direction);
     86 }
     87 
     88 void HTMLTitleElement::setText(const String &value)
     89 {
     90     ExceptionCode ec = 0;
     91     int numChildren = childNodeCount();
     92 
     93     if (numChildren == 1 && firstChild()->isTextNode())
     94         static_cast<Text*>(firstChild())->setData(value, ec);
     95     else {
     96         // We make a copy here because entity of "value" argument can be Document::m_title,
     97         // which goes empty during removeChildren() invocation below,
     98         // which causes HTMLTitleElement::childrenChanged(), which ends up Document::setTitle().
     99         String valueCopy(value);
    100 
    101         if (numChildren > 0)
    102             removeChildren();
    103 
    104         appendChild(document()->createTextNode(valueCopy.impl()), ec);
    105     }
    106 }
    107 
    108 }
    109