render_replaced.cpp

khtml在gtk上的移植版本

/**
 * This file is part of the HTML widget for KDE.
 *
 * Copyright (C) 1999 Lars Knoll ([e-mail])
 * Copyright (C) 2000 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 "render_replaced.h"

#include "render_arena.h"
#include "render_canvas.h"
#include "render_line.h"

#include <assert.h>
#include <qwidget.h>
#include <qpainter.h>
#include <qevent.h>
#include <qapplication.h>

#include "khtml_ext.h"
#include "khtmlview.h"
#include "xml/dom2_eventsimpl.h"
#include "khtml_part.h"
#include "xml/dom_docimpl.h" // ### remove dependency
#include "xml/dom_position.h"
#include <kdebug.h>

using namespace khtml;
using namespace DOM;


RenderReplaced::RenderReplaced(DOM::NodeImpl* node)
    : RenderBox(node)
{
    // init RenderObject attributes
    setReplaced(true);

    m_intrinsicWidth = 200;
    m_intrinsicHeight = 150;
}

bool RenderReplaced::shouldPaint(PaintInfo& i, int& _tx, int& _ty)
{
    if (i.phase != PaintActionForeground && i.phase != PaintActionOutline && i.phase != PaintActionSelection)
        return false;

    if (!shouldPaintWithinRoot(i))
        return false;
        
    // if we're invisible or haven't received a layout yet, then just bail.
    if (style()->visibility() != VISIBLE || m_y <=  -500000)  return false;

    int tx = _tx + m_x;
    int ty = _ty + m_y;

    // Early exit if the element touches the edges.
    int os = 2*maximalOutlineSize(i.phase);
    if ((tx >= i.r.x() + i.r.width() + os) || (tx + m_width <= i.r.x() - os))
        return false;
    if ((ty >= i.r.y() + i.r.height() + os) || (ty + m_height <= i.r.y() - os))
        return false;

    return true;
}

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

#ifdef DEBUG_LAYOUT
    kdDebug( 6040 ) << "RenderReplaced::calcMinMaxWidth() known=" << minMaxKnown() << endl;
#endif

    int width = calcReplacedWidth() + paddingLeft() + paddingRight() + borderLeft() + borderRight();
    if ( style()->width().isPercent() || style()->height().isPercent() ) {
        m_minWidth = 0;
        m_maxWidth = width;
    }
    else
        m_minWidth = m_maxWidth = width;

    setMinMaxKnown();
}

short RenderReplaced::lineHeight( bool, bool ) const
{
    return height()+marginTop()+marginBottom();
}

short RenderReplaced::baselinePosition( bool, bool ) const
{
    return height()+marginTop()+marginBottom();
}

bool RenderReplaced::canHaveChildren() const
{
    // We should not really be a RenderContainer subclass.
    return false;
}

long RenderReplaced::caretMinOffset() const 
{ 
    return 0; 
}

// Returns 1 since a replaced element can have the caret positioned 
// at its beginning (0), or at its end (1).
long RenderReplaced::caretMaxOffset() const 
{ 
    return 1; 
}

unsigned long RenderReplaced::caretMaxRenderedOffset() const
{
    return 1; 
}

Position RenderReplaced::positionForCoordinates(int _x, int _y)
{
    InlineBox *box = inlineBoxWrapper();
    if (!box)
        return Position(element(), 0);

    RootInlineBox *root = box->root();

    int absx, absy;
    containingBlock()->absolutePosition(absx, absy);

    int top = absy + root->topOverflow();
    int bottom = root->nextRootBox() ? absy + root->nextRootBox()->topOverflow() : absy + root->bottomOverflow();

    if (_y < top)
        return Position(element(), caretMinOffset()); // coordinates are above
    
    if (_y >= bottom)
        return Position(element(), caretMaxOffset()); // coordinates are below
    
    if (element()) {
        if (_x <= absx + xPos() + (width() / 2))
            return Position(element(), 0);
        return Position(element(), 1);
    }

    return RenderBox::positionForCoordinates(_x, _y);
}

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

RenderWidget::RenderWidget(DOM::NodeImpl* node)
      : RenderReplaced(node),
	m_deleteWidget(false)
{
#if KWIQ    
    QOBJECT_TYPE(RenderWidget);
#endif    
    m_widget = 0;
    // a replaced element doesn't support being anonymous
    assert(node);
    m_view = node->getDocument()->view();

    // this is no real reference counting, its just there
    // to make sure that we're not deleted while we're recursed
    // in an eventFilter of the widget
    ref();
}

void RenderWidget::detach()
{
    remove();

    if ( m_widget ) {
        if ( m_view )
            m_view->removeChild( m_widget );

        m_widget->removeEventFilter( this );
        m_widget->setMouseTracking( false );
    }

    RenderArena* arena = renderArena();
    if (m_inlineBoxWrapper) {
        if (!documentBeingDestroyed())
            m_inlineBoxWrapper->remove();
        m_inlineBoxWrapper->detach(arena);
    }
    setNode(0);
    deref(arena);
}

RenderWidget::~RenderWidget()
{
    KHTMLAssert( refCount() <= 0 );

    if (m_deleteWidget) {
	delete m_widget;
    }
}

void  RenderWidget::resizeWidget( QWidget *widget, int w, int h )
{
#if !APPLE_CHANGES || KWIQ
    // ugly hack to limit the maximum size of the widget (as X11 has problems if it's bigger)
    h = QMIN( h, 3072 );
    w = QMIN( w, 2000 );
#endif

    if (element() && (widget->width() != w || widget->height() != h)) {
        RenderArena *arena = ref();
        element()->ref();
        widget->resize( w, h );
        element()->deref();
        deref(arena);
    }
}

void RenderWidget::setQWidget(QWidget *widget, bool deleteWidget)
{
    if (widget != m_widget)
    {
        if (m_widget) {
            m_widget->removeEventFilter(this);
            disconnect( m_widget, SIGNAL( destroyed()), this, SLOT( slotWidgetDestructed()));
	    if (m_deleteWidget) {
		delete m_widget;
	    }
            m_widget = 0;
        }
        m_widget = widget;
        if (m_widget) {
            connect( m_widget, SIGNAL( destroyed()), this, SLOT( slotWidgetDestructed()));
            m_widget->installEventFilter(this);
            // if we've already received a layout, apply the calculated space to the
            // widget immediately, but we have to have really been full constructed (with a non-null
            // style pointer).
            if (!needsLayout() && style()) {
		resizeWidget( m_widget,
			      m_width-borderLeft()-borderRight()-paddingLeft()-paddingRight(),
			      m_height-borderLeft()-borderRight()-paddingLeft()-paddingRight() );
            }
            else
                setPos(xPos(), -500000);

#if APPLE_CHANGES
	    if (style()) {
	        if (style()->visibility() != VISIBLE)
                    m_widget->hide();
		else
		    m_widget->show();
	    }
#endif
        }
	m_view->addChild( m_widget, -500000, 0 );
    }
    m_deleteWidget = deleteWidget;
}

void RenderWidget::layout( )
{
    KHTMLAssert( needsLayout() );
    KHTMLAssert( minMaxKnown() );
#if !APPLE_CHANGES || KWIQ // kwiq: relevant?
    if ( m_widget ) {