render_canvas.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 HTML widget for KDE.
 *
 * Copyright (C) 1999-2003 Lars Knoll ([e-mail])
 *           (C) 2003 Apple Computer, Inc.
 *           (C) 2005 Allan Sandfeld Jensen ([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 "rendering/render_canvas.h"
#include "rendering/render_layer.h"
#include "xml/dom_docimpl.h"

#include "khtmlview.h"
#include "khtml_part.h"
#include <kdebug.h>
#include <kglobal.h>

using namespace khtml;

//#define BOX_DEBUG
//#define SPEED_DEBUG

RenderCanvas::RenderCanvas(DOM::NodeImpl* node, KHTMLView *view)
    : RenderBlock(node)
{
    // init RenderObject attributes
    setInline(false);
    setIsAnonymous(false);

    m_view = view;
    // try to contrain the width to the views width

    m_minWidth = 0;
    m_height = 0;

    m_width = m_minWidth;
    m_maxWidth = m_minWidth;

    m_rootWidth = m_rootHeight = 0;
    m_viewportWidth = m_viewportHeight = 0;

    setPositioned(true); // to 0,0 :)

    m_staticMode = false;
    m_pagedMode = false;
    m_printImages = true;

    m_pageTop = 0;
    m_pageBottom = 0;

    m_page = 0;

    m_maximalOutlineSize = 0;

    m_selectionStart = 0;
    m_selectionEnd = 0;
    m_selectionStartPos = -1;
    m_selectionEndPos = -1;

    // Create a new root layer for our layer hierarchy.
    m_layer = new (node->getDocument()->renderArena()) RenderLayer(this);
}

RenderCanvas::~RenderCanvas()
{
    delete m_page;
}

void RenderCanvas::setStyle(RenderStyle* style)
{
    /*
    if (m_pagedMode)
        style->setOverflow(OHIDDEN); */
    RenderBlock::setStyle(style);
}

void RenderCanvas::calcHeight()
{
    if (m_pagedMode || !m_view)
        m_height = m_rootHeight;
    else
        m_height = m_view->visibleHeight();
}

void RenderCanvas::calcWidth()
{
    // the width gets set by KHTMLView::print when printing to a printer.
    if(m_pagedMode || !m_view)
    {
        m_width = m_rootWidth;
        return;
    }

    m_width = m_view ?
                m_view->frameWidth() + paddingLeft() + paddingRight() + borderLeft() + borderRight()
                : m_minWidth;

    if (style()->marginLeft().isFixed())
        m_marginLeft = style()->marginLeft().value();
    else
        m_marginLeft = 0;

    if (style()->marginRight().isFixed())
        m_marginRight = style()->marginRight().value();
    else
        m_marginRight = 0;
}

void RenderCanvas::calcMinMaxWidth()
{
    KHTMLAssert( !minMaxKnown() );

    RenderBlock::calcMinMaxWidth();

    m_maxWidth = m_minWidth;

    setMinMaxKnown();
}

//#define SPEED_DEBUG

void RenderCanvas::layout()
{
    if (m_pagedMode) {
       m_minWidth = m_width;
//        m_maxWidth = m_width;
    }

    m_needsFullRepaint =  markedForRepaint() || !view() || view()->needsFullRepaint() || m_pagedMode;

    setChildNeedsLayout(true);
    setMinMaxKnown(false);
    for(RenderObject* c = firstChild(); c; c = c->nextSibling())
        c->setChildNeedsLayout(true);

#ifdef SPEED_DEBUG
    QTime qt;
    qt.start();
#endif
    if ( recalcMinMax() )
	recalcMinMaxWidths();

#ifdef SPEED_DEBUG
    kdDebug() << "RenderCanvas::calcMinMax time used=" << qt.elapsed() << endl;
    qt.start();
#endif

#ifdef SPEED_DEBUG
    kdDebug() << "RenderCanvas::layout time used=" << qt.elapsed() << endl;
    qt.start();
#endif

    if (m_pagedMode || !m_view) {
        m_width = m_rootWidth;
        m_height = m_rootHeight;
    }
    else
    {
        m_viewportWidth = m_width = m_view->visibleWidth();
        m_viewportHeight = m_height = m_view->visibleHeight();
    }

    RenderBlock::layout();

    int docW = docWidth();
    int docH = docHeight();

    if (!m_pagedMode) {
        bool vss = m_view->verticalScrollBar()->isShown();
        bool hss = m_view->horizontalScrollBar()->isShown();
        QSize s = m_view->viewportSize(docW, docH);

        // content size, with scrollbar hysteresis
        int hDocH = docH;
        int hDocW = docW;

        // if we are about to show a scrollbar, and the document is sized to the viewport w or h,
        // then reserve the scrollbar space so that it doesn't trigger the _other_ scrollbar

        if (!vss && m_width - m_view->verticalScrollBar()->sizeHint().width() == s.width() &&
            docW <= m_width)
            hDocW = kMin( docW, s.width() );

        if (!hss && m_height - m_view->horizontalScrollBar()->sizeHint().height() == s.height() &&
            docH <= m_height)
            hDocH = kMin( docH, s.height() );

        // likewise, if a scrollbar is shown, and we have a cunning plan to turn it off,
        // think again if we are falling downright in the hysteresis zone

        if (vss && s.width() > docW && docW > m_view->visibleWidth())
            hDocW = s.width()+1;

        if (hss && s.height() > docH && docH > m_view->visibleHeight())
            hDocH = s.height()+1;

        m_view->resizeContents(hDocW, hDocH);

        setWidth( m_viewportWidth = s.width() );
        setHeight( m_viewportHeight = s.height() );
    }

    // ### we could maybe do the call below better and only pass true if the docsize changed.
    layoutPositionedObjects( true );

#ifdef SPEED_DEBUG
    kdDebug() << "RenderCanvas::end time used=" << qt.elapsed() << endl;
#endif

//     kdDebug(6040) << "RenderCanvas::resize layer to " << kMax( docW,int( m_width ) ) << "x"  << kMax( docH,m_height ) << endl;

    layer()->resize( kMax( docW,int( m_width ) ), kMax( docH,m_height ) );
    layer()->updateLayerPositions( layer(), needsFullRepaint(), true );

    scheduleDeferredRepaints();
    setNeedsLayout(false);
}

bool RenderCanvas::needsFullRepaint() const
{
    return m_needsFullRepaint || m_pagedMode;
}

void RenderCanvas::repaintViewRectangle(int x, int y, int w, int h)
{
  KHTMLAssert( view() );
  view()->scheduleRepaint( x, y, w, h );
}

bool RenderCanvas::absolutePosition(int &xPos, int &yPos, bool f)
{
    if ( f && m_pagedMode) {
        xPos = 0;
        yPos = m_pageTop;
    }
    else
    if ( f && m_view) {
	xPos = m_view->contentsX();
	yPos = m_view->contentsY();
    }
    else {
        xPos = yPos = 0;
    }
    return true;
}

void RenderCanvas::paint(PaintInfo& paintInfo, int _tx, int _ty)
{
#ifdef DEBUG_LAYOUT
    kdDebug( 6040 ) << renderName() << this << " ::paintObject() w/h = (" << width() << "/" << height() << ")" << endl;
#endif

    // 1. paint background, borders etc
    if(paintInfo.phase == PaintActionElementBackground) {
        paintBoxDecorations(paintInfo, _tx, _ty);
        return;
    }

    // 2. paint contents
    for( RenderObject *child = firstChild(); child; child=child->nextSibling())
        if(!child->layer() && !child->isFloating())
            child->paint(paintInfo, _tx, _ty);

    // 3. paint floats.
    if (paintInfo.phase == PaintActionFloat)
        paintFloats(paintInfo, _tx, _ty);

#ifdef BOX_DEBUG
    if (m_view)
    {
        _tx += m_view->contentsX();
        _ty += m_view->contentsY();
    }

    outlineBox(p, _tx, _ty);
#endif

}

void RenderCanvas::paintBoxDecorations(PaintInfo& paintInfo, int /*_tx*/, int /*_ty*/)
{
    if ((firstChild() && firstChild()->style()->visibility() == VISIBLE) || !view())
        return;

    paintInfo.p->fillRect(paintInfo.r, view()->palette().active().color(QColorGroup::Base));
}

void RenderCanvas::repaintRectangle(int x, int y, int w, int h, bool immediate, bool f)
{
    if (m_staticMode) return;
//    kdDebug( 6040 ) << "updating views contents (" << x << "/" << y << ") (" << w << "/" << h << ")" << endl;

    if (f && m_pagedMode) {
        y += m_pageTop;
    } else
    if ( f && m_view ) {
        x += m_view->contentsX();
        y += m_view->contentsY();
    }

    QRect vr = viewRect();
    QRect ur(x, y, w, h);

    if (m_view && ur.intersects(vr)) {

        if (immediate)
	// ### KWQ's updateContents has an additional parameter "now".
	// It's not clear what the difference between updateContents(...,true)
	// and repaintContents(...) is. As Qt doesn't have this, I'm leaving it out. (LS)
            m_view->updateContents(ur/*, true*/);
        else
            m_view->scheduleRepaint(x, y, w, h);
    }
}

void RenderCanvas::deferredRepaint( RenderObject* o )
{
    m_dirtyChildren.append( o );
}

void RenderCanvas::scheduleDeferredRepaints()
{
    if (!needsFullRepaint()) {
        QValueList<RenderObject*>::const_iterator it;
        for ( it = m_dirtyChildren.begin(); it != m_dirtyChildren.end(); ++it )
            (*it)->repaint();
    }
    //kdDebug(6040) << "scheduled deferred repaints: " << m_dirtyChildren.count() << " needed full repaint: " << needsFullRepaint() << endl;
    m_dirtyChildren.clear();
}

void RenderCanvas::repaint(bool immediate)
{
    if (m_view && !m_staticMode) {
        if (immediate) {
            //m_view->resizeContents(docWidth(), docHeight());
            m_view->unscheduleRepaint();
            if (needsLayout()) {
                m_view->scheduleRelayout();
                return;
            }
	    // ### same as in repaintRectangle
            m_view->updateContents(m_view->contentsX(), m_view->contentsY(),
                                   m_view->visibleWidth(), m_view->visibleHeight()/*, true*/);
        }
        else
            m_view->scheduleRepaint(m_view->contentsX(), m_view->contentsY(),
                                    m_view->visibleWidth(), m_view->visibleHeight());
    }
}