html_headimpl.cpp

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/**
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 1999 Lars Knoll ([e-mail])
 *           (C) 1999 Antti Koivisto ([e-mail])
 *           (C) 2001 Dirk Mueller ([e-mail])
 * Copyright (C) 2003 Apple Computer, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
// -------------------------------------------------------------------------

#include "html/html_headimpl.h"
#include "html/html_documentimpl.h"
#include "xml/dom_textimpl.h"

#include "khtmlview.h"
#include "khtml_part.h"

#include "misc/htmlhashes.h"
#include "misc/loader.h"
#include "misc/helper.h"

#include "css/cssstyleselector.h"
#include "css/css_stylesheetimpl.h"
#include "css/csshelper.h"

#include <kurl.h>
#include <kdebug.h>

using namespace DOM;
using namespace khtml;

HTMLBaseElementImpl::HTMLBaseElementImpl(DocumentPtr *doc)
    : HTMLElementImpl(doc)
{
}

HTMLBaseElementImpl::~HTMLBaseElementImpl()
{
}

NodeImpl::Id HTMLBaseElementImpl::id() const
{
    return ID_BASE;
}

void HTMLBaseElementImpl::parseHTMLAttribute(HTMLAttributeImpl *attr)
{
    switch(attr->id())
    {
    case ATTR_HREF:
	m_href = khtml::parseURL(attr->value());
	process();
	break;
    case ATTR_TARGET:
	m_target = attr->value();
	process();
	break;
    default:
        HTMLElementImpl::parseHTMLAttribute(attr);
    }
}

void HTMLBaseElementImpl::insertedIntoDocument()
{
    HTMLElementImpl::insertedIntoDocument();
    process();
}

void HTMLBaseElementImpl::removedFromDocument()
{
    HTMLElementImpl::removedFromDocument();

    // Since the document doesn't have a base element...
    // (This will break in the case of multiple base elements, but that's not valid anyway (?))
    getDocument()->setBaseURL( QString::null );
    getDocument()->setBaseTarget( QString::null );
}

void HTMLBaseElementImpl::process()
{
    if (!inDocument())
	return;

    if(!m_href.isEmpty() && getDocument()->part())
	getDocument()->setBaseURL( KURL( getDocument()->part()->url(), m_href.string() ).url() );

    if(!m_target.isEmpty())
	getDocument()->setBaseTarget( m_target.string() );

    // ### should changing a document's base URL dynamically automatically update all images, stylesheets etc?
}

// -------------------------------------------------------------------------

HTMLLinkElementImpl::HTMLLinkElementImpl(DocumentPtr *doc)
    : HTMLElementImpl(doc)
{
    m_sheet = 0;
    m_loading = false;
    m_cachedSheet = 0;
    m_alternate = false;
    m_disabledState = 0;
}

HTMLLinkElementImpl::~HTMLLinkElementImpl()
{
    if(m_sheet) m_sheet->deref();
    if(m_cachedSheet) m_cachedSheet->deref(this);
}

NodeImpl::Id HTMLLinkElementImpl::id() const
{
    return ID_LINK;
}

void HTMLLinkElementImpl::setDisabledState(bool _disabled)
{
    int oldDisabledState = m_disabledState;
    m_disabledState = _disabled ? 2 : 1;
    if (oldDisabledState != m_disabledState) {
        // If we change the disabled state while the sheet is still loading, then we have to
        // perform three checks:
        if (isLoading()) {
            // Check #1: If the sheet becomes disabled while it was loading, and if it was either
            // a main sheet or a sheet that was previously enabled via script, then we need
            // to remove it from the list of pending sheets.
            if (m_disabledState == 2 && (!m_alternate || oldDisabledState == 1))
                getDocument()->stylesheetLoaded();

            // Check #2: An alternate sheet becomes enabled while it is still loading.
            if (m_alternate && m_disabledState == 1)
                getDocument()->addPendingSheet();

            // Check #3: A main sheet becomes enabled while it was still loading and
            // after it was disabled via script.  It takes really terrible code to make this
            // happen (a double toggle for no reason essentially).  This happens on
            // virtualplastic.net, which manages to do about 12 enable/disables on only 3
            // sheets. :)
            if (!m_alternate && m_disabledState == 1 && oldDisabledState == 2)
                getDocument()->addPendingSheet();

            // If the sheet is already loading just bail.
            return;
        }

        // Load the sheet, since it's never been loaded before.
        if (!m_sheet && m_disabledState == 1)
            process();
        else
            getDocument()->updateStyleSelector(); // Update the style selector.
    }
}

void HTMLLinkElementImpl::parseHTMLAttribute(HTMLAttributeImpl *attr)
{
    switch (attr->id())
    {
    case ATTR_REL:
        m_rel = attr->value();
        process();
        break;
    case ATTR_HREF:
        m_url = getDocument()->completeURL( khtml::parseURL(attr->value()).string() );
	process();
        break;
    case ATTR_TYPE:
        m_type = attr->value();
	process();
        break;
    case ATTR_MEDIA:
        m_media = attr->value().string().lower();
        process();
        break;
    case ATTR_DISABLED:
        setDisabledState(!attr->isNull());
        break;
    default:
        HTMLElementImpl::parseHTMLAttribute(attr);
    }
}

void HTMLLinkElementImpl::process()
{
    if (!inDocument())
        return;

    QString type = m_type.string().lower();
    QString rel = m_rel.string().lower();

    KHTMLPart* part = getDocument()->part();

    // IE extension: location of small icon for locationbar / bookmarks
#if APPLE_CHANGES
    if ( part && rel == "shortcut icon" && !m_url.isEmpty() && !part->parentPart())
    	part->browserExtension()->setIconURL( KURL(m_url.string()) );

    // Mozilla extension to IE extension: icon specified with type
    if ( part && rel == "icon" && !m_url.isEmpty() && !part->parentPart())
    	part->browserExtension()->setTypedIconURL( KURL(m_url.string()), type );
#else
    // Uses both "shortcut icon" and "icon"

    if ( part && rel.contains("icon") && !m_url.isEmpty() && !part->parentPart())
        part->browserExtension()->setIconURL( KURL(m_url.string()) );
#endif

    // Stylesheet
    // This was buggy and would incorrectly match <link rel="alternate">, which has a different specified meaning. -dwh
    if(m_disabledState != 2 && (type.contains("text/css") || rel == "stylesheet" || (rel.contains("alternate") && rel.contains("stylesheet"))) && getDocument()->part()) {
        // no need to load style sheets which aren't for the screen output
        // ### there may be in some situations e.g. for an editor or script to manipulate
	// also, don't load style sheets for standalone documents
        if( m_media.isNull() || m_media.contains("screen") || m_media.contains("all") || m_media.contains("print") ) {
            m_loading = true;

            // Add ourselves as a pending sheet, but only if we aren't an alternate
            // stylesheet.  Alternate stylesheets don't hold up render tree construction.
            m_alternate = rel.contains("alternate");

            QString chset = getAttribute( ATTR_CHARSET ).string();
            if (m_cachedSheet)
                m_cachedSheet->deref(this);
            m_cachedSheet = getDocument()->docLoader()->requestStyleSheet(m_url, chset);
            if (m_cachedSheet) {
                if (!isAlternate())
                    getDocument()->addPendingSheet();
                m_cachedSheet->ref(this);
            } else
                m_loading = false;

        }
    }
    else if (m_sheet) {
        // we no longer contain a stylesheet, e.g. perhaps rel or type was changed
        m_sheet->deref();
        m_sheet = 0;
        getDocument()->updateStyleSelector();
    }
}

void HTMLLinkElementImpl::insertedIntoDocument()
{
    HTMLElementImpl::insertedIntoDocument();
    process();
}

void HTMLLinkElementImpl::removedFromDocument()
{