html_imageimpl.cpp

konqueror3 embedded版本, KDE环境下的当家浏览器的嵌入式版本源码包.

/**
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 1999 Lars Knoll ([e-mail])
 *           (C) 1999 Antti Koivisto ([e-mail])
 *
 * 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., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "html/html_imageimpl.h"
#include "html/html_formimpl.h"
#include "html/html_documentimpl.h"

#include "misc/htmlhashes.h"
#include "khtmlview.h"
#include "khtml_part.h"

#include <kstringhandler.h>
#include <kglobal.h>
#include <kdebug.h>

#include "rendering/render_image.h"
#include "rendering/render_flow.h"
#include "css/cssstyleselector.h"
#include "css/cssproperties.h"
#include "css/cssvalues.h"
#include "css/csshelper.h"
#include "xml/dom2_eventsimpl.h"

#include <qstring.h>
#include <qpoint.h>
#include <qregion.h>
#include <qptrstack.h>
#include <qimage.h>
#include <qpointarray.h>

using namespace DOM;
using namespace khtml;

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

HTMLImageElementImpl::HTMLImageElementImpl(DocumentPtr *doc, HTMLFormElementImpl *f)
    : HTMLElementImpl(doc), ismap(false), loadEventSent(true), m_image(0), m_form(f)
{
    if (m_form)
        m_form->registerImgElement(this);
}

HTMLImageElementImpl::~HTMLImageElementImpl()
{
    if (getDocument())
        getDocument()->removeImage(this);

    if (m_image)
        m_image->deref(this);

    if (m_form)
        m_form->removeImgElement(this);
}

NodeImpl::Id HTMLImageElementImpl::id() const
{
    return ID_IMG;
}

void HTMLImageElementImpl::parseAttribute(AttributeImpl *attr)
{
    switch (attr->id())
    {
    case ATTR_ALT:
        setChanged();
        break;
    case ATTR_SRC: {
        setChanged();

        //Start loading the image already, to generate events
        DOMString url = attr->value();
        if (!url.isEmpty()) { //### why do we not hide or something when setting this?
            CachedImage* newImage = getDocument()->docLoader()->requestImage(khtml::parseURL(url));
            if (newImage && newImage != m_image) {
                loadEventSent = false;
                if (m_image)
                    m_image->deref(this);
                m_image = newImage;
                m_image->ref(this);
            }
        }
    }
    break;
    case ATTR_WIDTH:
        if (!attr->value().isEmpty())
            addCSSLength(CSS_PROP_WIDTH, attr->value());
        else
            removeCSSProperty(CSS_PROP_WIDTH);
        break;
    case ATTR_HEIGHT:
        if (!attr->value().isEmpty())
            addCSSLength(CSS_PROP_HEIGHT, attr->value());
        else
            removeCSSProperty(CSS_PROP_HEIGHT);
        break;
    case ATTR_BORDER:
        // border="noborder" -> border="0"
        if(attr->value().toInt()) {
            addCSSLength(CSS_PROP_BORDER_WIDTH, attr->value());
            addCSSProperty( CSS_PROP_BORDER_TOP_STYLE, CSS_VAL_SOLID );
            addCSSProperty( CSS_PROP_BORDER_RIGHT_STYLE, CSS_VAL_SOLID );
            addCSSProperty( CSS_PROP_BORDER_BOTTOM_STYLE, CSS_VAL_SOLID );
            addCSSProperty( CSS_PROP_BORDER_LEFT_STYLE, CSS_VAL_SOLID );
        } else {
             removeCSSProperty( CSS_PROP_BORDER_WIDTH );
             removeCSSProperty( CSS_PROP_BORDER_TOP_STYLE );
             removeCSSProperty( CSS_PROP_BORDER_RIGHT_STYLE );
             removeCSSProperty( CSS_PROP_BORDER_BOTTOM_STYLE );
             removeCSSProperty( CSS_PROP_BORDER_LEFT_STYLE );
        }
        break;
    case ATTR_VSPACE:
        addCSSLength(CSS_PROP_MARGIN_TOP, attr->value());
        addCSSLength(CSS_PROP_MARGIN_BOTTOM, attr->value());
        break;
    case ATTR_HSPACE:
        addCSSLength(CSS_PROP_MARGIN_LEFT, attr->value());
        addCSSLength(CSS_PROP_MARGIN_RIGHT, attr->value());
        break;
    case ATTR_ALIGN:
	addHTMLAlignment( attr->value() );
	break;
    case ATTR_VALIGN:
	addCSSProperty(CSS_PROP_VERTICAL_ALIGN, attr->value().lower());
        break;
    case ATTR_USEMAP:
        if ( attr->value()[0] == '#' )
            usemap = attr->value();
        else {
            QString url = getDocument()->completeURL( khtml::parseURL( attr->value() ).string() );
            // ### we remove the part before the anchor and hope
            // the map is on the same html page....
            usemap = url;
        }
        m_hasAnchor = attr->val() != 0;
    case ATTR_ISMAP:
        ismap = true;
        break;
    case ATTR_ONABORT: // ### add support for this
        setHTMLEventListener(EventImpl::ABORT_EVENT,
	    getDocument()->createHTMLEventListener(attr->value().string(), "onabort", this));
        break;
    case ATTR_ONERROR:
        setHTMLEventListener(EventImpl::ERROR_EVENT,
	    getDocument()->createHTMLEventListener(attr->value().string(), "onerror", this));
        break;
    case ATTR_ONLOAD:
        setHTMLEventListener(EventImpl::LOAD_EVENT,
	    getDocument()->createHTMLEventListener(attr->value().string(), "onload", this));
        break;
    case ATTR_NOSAVE:
	break;
    case ATTR_NAME:
        if (inDocument() && m_name != attr->value()) {
            getDocument()->underDocNamedCache().remove(m_name.string(),        this);
            getDocument()->underDocNamedCache().add   (attr->value().string(), this);
        }
        m_name = attr->value();
        //fallthrough
    default:
        HTMLElementImpl::parseAttribute(attr);
    }
}

void HTMLImageElementImpl::notifyFinished(CachedObject *finishedObj)
{
    if (m_image == finishedObj) {
        getDocument()->dispatchImageLoadEventSoon(this);
    }
}

void HTMLImageElementImpl::dispatchLoadEvent()
{
    if (!loadEventSent) {
        loadEventSent = true;
        if (m_image->isErrorImage()) {
            dispatchHTMLEvent(EventImpl::ERROR_EVENT, false, false);
        } else {
            dispatchHTMLEvent(EventImpl::LOAD_EVENT, false, false);
        }
    }
}

DOMString HTMLImageElementImpl::altText() const
{
    // lets figure out the alt text.. magic stuff
    // http://www.w3.org/TR/1998/REC-html40-19980424/appendix/notes.html#altgen
    // also heavily discussed by Hixie on bugzilla
    DOMString alt( getAttribute( ATTR_ALT ) );
    // fall back to title attribute
    if ( alt.isNull() )
        alt = getAttribute( ATTR_TITLE );
#if 0
    if ( alt.isNull() ) {
        QString p = KURL( getDocument()->completeURL( getAttribute(ATTR_SRC).string() ) ).prettyURL();
        int pos;
        if ( ( pos = p.findRev( '.' ) ) > 0 )
            p.truncate( pos );
        alt = DOMString( KStringHandler::csqueeze( p ) );
    }
#endif

    return alt;
}

void HTMLImageElementImpl::attach()
{
    assert(!attached());
    assert(!m_render);
    assert(parentNode());

    RenderStyle* _style = getDocument()->styleSelector()->styleForElement(this);
    _style->ref();
    if (parentNode()->renderer() && parentNode()->renderer()->childAllowed() &&
        _style->display() != NONE)
    {
        m_render = new (getDocument()->renderArena()) RenderImage(this);
        m_render->setStyle(_style);
        parentNode()->renderer()->addChild(m_render, nextRenderer());
    }
    _style->deref();
    
    NodeBaseImpl::attach();
    if (m_render)
        m_render->updateFromElement();
}

void HTMLImageElementImpl::removedFromDocument()
{
    getDocument()->underDocNamedCache().remove(m_name.string(), this);
    HTMLElementImpl::removedFromDocument();
}

void HTMLImageElementImpl::insertedIntoDocument()
{
    getDocument()->underDocNamedCache().add(m_name.string(), this);
    HTMLElementImpl::insertedIntoDocument();
}

void HTMLImageElementImpl::removeId(const QString& id)
{
    getDocument()->underDocNamedCache().remove(id, this);
    HTMLElementImpl::removeId(id);
}

void HTMLImageElementImpl::addId   (const QString& id)
{
    getDocument()->underDocNamedCache().add(id, this);
    HTMLElementImpl::addId(id);
}


long HTMLImageElementImpl::width() const
{
    if (!m_render) {
        DOMString widthAttr = getAttribute(ATTR_WIDTH);
        if (!widthAttr.isNull())
            return widthAttr.toInt();