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      1 /**
      2  * (C) 1999-2003 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2004, 2006 Apple Computer, Inc.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 #include "config.h"
     21 #include "StyleSheet.h"
     22 
     23 #include "MediaList.h"
     24 #include "Node.h"
     25 
     26 namespace WebCore {
     27 
     28 StyleSheet::StyleSheet(StyleSheet* parentSheet, const String& originalURL, const KURL& finalURL)
     29     : StyleList(parentSheet)
     30     , m_parentNode(0)
     31     , m_originalURL(originalURL)
     32     , m_finalURL(finalURL)
     33     , m_disabled(false)
     34 {
     35 }
     36 
     37 StyleSheet::StyleSheet(Node* parentNode, const String& originalURL, const KURL& finalURL)
     38     : StyleList(0)
     39     , m_parentNode(parentNode)
     40     , m_originalURL(originalURL)
     41     , m_finalURL(finalURL)
     42     , m_disabled(false)
     43 {
     44 }
     45 
     46 StyleSheet::StyleSheet(StyleBase* owner, const String& originalURL, const KURL& finalURL)
     47     : StyleList(owner)
     48     , m_parentNode(0)
     49     , m_originalURL(originalURL)
     50     , m_finalURL(finalURL)
     51     , m_disabled(false)
     52 {
     53 }
     54 
     55 StyleSheet::~StyleSheet()
     56 {
     57     if (m_media)
     58         m_media->setParent(0);
     59 
     60     // For style rules outside the document, .parentStyleSheet can become null even if the style rule
     61     // is still observable from JavaScript. This matches the behavior of .parentNode for nodes, but
     62     // it's not ideal because it makes the CSSOM's behavior depend on the timing of garbage collection.
     63     for (unsigned i = 0; i < length(); ++i) {
     64         ASSERT(item(i)->parent() == this);
     65         item(i)->setParent(0);
     66     }
     67 }
     68 
     69 StyleSheet* StyleSheet::parentStyleSheet() const
     70 {
     71     return (parent() && parent()->isStyleSheet()) ? static_cast<StyleSheet*>(parent()) : 0;
     72 }
     73 
     74 void StyleSheet::setMedia(PassRefPtr<MediaList> media)
     75 {
     76     if (m_media)
     77         m_media->setParent(0);
     78 
     79     m_media = media;
     80     m_media->setParent(this);
     81 }
     82 
     83 KURL StyleSheet::completeURL(const String& url) const
     84 {
     85     // Always return a null URL when passed a null string.
     86     // FIXME: Should we change the KURL constructor to have this behavior?
     87     // See also Document::completeURL(const String&)
     88     if (url.isNull())
     89         return KURL();
     90     return KURL(baseURL(), url);
     91 }
     92 
     93 }
     94