/*

 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)

 * Copyright (C) 2000 Dirk Mueller (mueller@kde.org)

 * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.

 *

 * 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 "config.h"

#include "RenderReplaced.h"

#include "RenderBlock.h"

#include "RenderLayer.h"

using namespace std;

namespace WebCore {

typedef WTF::HashMap<const RenderReplaced*, IntRect> OverflowRectMap;

static OverflowRectMap* gOverflowRectMap = 0;

RenderReplaced::RenderReplaced(Node* node)

    : RenderBox(node)

    , m_intrinsicSize(300, 150)

    , m_selectionState(SelectionNone)

    , m_hasOverflow(false)

{

    setReplaced(true);

}

RenderReplaced::RenderReplaced(Node* node, const IntSize& intrinsicSize)

    : RenderBox(node)

    , m_intrinsicSize(intrinsicSize)

    , m_selectionState(SelectionNone)

    , m_hasOverflow(false)

{

    setReplaced(true);

}

RenderReplaced::~RenderReplaced()

{

    if (m_hasOverflow)

        gOverflowRectMap->remove(this);

}

bool RenderReplaced::shouldPaint(PaintInfo& paintInfo, int& tx, int& ty)

{

    if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseOutline && paintInfo.phase != PaintPhaseSelfOutline 

            && paintInfo.phase != PaintPhaseSelection)

        return false;

    if (!shouldPaintWithinRoot(paintInfo))

        return false;

    // if we're invisible or haven't received a layout yet, then just bail.

    if (style()->visibility() != VISIBLE)

        return false;

    int currentTX = tx + m_x;

    int currentTY = ty + m_y;

    // Early exit if the element touches the edges.

    int top = currentTY + overflowTop();

    int bottom = currentTY + overflowHeight();

    if (isSelected() && m_inlineBoxWrapper) {

        int selTop = ty + m_inlineBoxWrapper->root()->selectionTop();

        int selBottom = ty + selTop + m_inlineBoxWrapper->root()->selectionHeight();

        top = min(selTop, top);

        bottom = max(selBottom, bottom);

    }

    int os = 2 * maximalOutlineSize(paintInfo.phase);

    if (currentTX + overflowLeft() >= paintInfo.rect.right() + os || currentTX + overflowWidth() <= paintInfo.rect.x() - os)

        return false;

    if (top >= paintInfo.rect.bottom() + os || bottom <= paintInfo.rect.y() - os)

        return false;

    return true;

}

void RenderReplaced::calcPrefWidths()

{

    ASSERT(prefWidthsDirty());

    int width = calcReplacedWidth() + paddingLeft() + paddingRight() + borderLeft() + borderRight();

    if (style()->width().isPercent() || (style()->width().isAuto() && style()->height().isPercent())) {

        m_minPrefWidth = 0;

        m_maxPrefWidth = width;

    } else

        m_minPrefWidth = m_maxPrefWidth = width;

    setPrefWidthsDirty(false);

}

short RenderReplaced::lineHeight(bool, bool) const

{

    return height() + marginTop() + marginBottom();

}

short RenderReplaced::baselinePosition(bool, bool) const

{

    return height() + marginTop() + marginBottom();

}

int 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).

// NOTE: Yet, "select" elements can have any number of "option" elements

// as children, so this "0 or 1" idea does not really hold up.

int RenderReplaced::caretMaxOffset() const 

{ 

    return 1; 

}

unsigned RenderReplaced::caretMaxRenderedOffset() const

{

    return 1; 

}

VisiblePosition RenderReplaced::positionForCoordinates(int x, int y)

{

    InlineBox* box = inlineBoxWrapper();

    if (!box)

        return VisiblePosition(element(), 0, DOWNSTREAM);

    // FIXME: This code is buggy if the replaced element is relative positioned.

    RootInlineBox* root = box->root();

    int top = root->topOverflow();

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

    if (y + yPos() < top)

        return VisiblePosition(element(), caretMinOffset(), DOWNSTREAM); // coordinates are above

    if (y + yPos() >= bottom)

        return VisiblePosition(element(), caretMaxOffset(), DOWNSTREAM); // coordinates are below

    if (element()) {

        if (x <= width() / 2)

            return VisiblePosition(element(), 0, DOWNSTREAM);

        return VisiblePosition(element(), 1, DOWNSTREAM);

    }

    return RenderBox::positionForCoordinates(x, y);

}

IntRect RenderReplaced::selectionRect(bool clipToVisibleContent)

{

    ASSERT(!needsLayout());

    if (!isSelected())

        return IntRect();

    if (!m_inlineBoxWrapper)

        // We're a block-level replaced element.  Just return our own dimensions.

        return absoluteBoundingBoxRect();

    RenderBlock* cb =  containingBlock();

    if (!cb)

        return IntRect();

    RootInlineBox* root = m_inlineBoxWrapper->root();

    IntRect rect(0, root->selectionTop() - yPos(), width(), root->selectionHeight());

    if (clipToVisibleContent)

        computeAbsoluteRepaintRect(rect);

    else {

        int absx, absy;

        absolutePositionForContent(absx, absy);

        rect.move(absx, absy);

    }

    return rect;

}

void RenderReplaced::setSelectionState(SelectionState s)

{

    m_selectionState = s;

    if (m_inlineBoxWrapper) {

        RootInlineBox* line = m_inlineBoxWrapper->root();

        if (line)

            line->setHasSelectedChildren(isSelected());

    }

    containingBlock()->setSelectionState(s);

}

bool RenderReplaced::isSelected() const

{

    SelectionState s = selectionState();

    if (s == SelectionNone)

        return false;

    if (s == SelectionInside)

        return true;

    int selectionStart, selectionEnd;

    selectionStartEnd(selectionStart, selectionEnd);

    if (s == SelectionStart)

        return selectionStart == 0;

    int end = element()->hasChildNodes() ? element()->childNodeCount() : 1;

    if (s == SelectionEnd)

        return selectionEnd == end;

    if (s == SelectionBoth)

        return selectionStart == 0 && selectionEnd == end;

    ASSERT(0);

    return false;

}

IntSize RenderReplaced::intrinsicSize() const

{

    return m_intrinsicSize;

}

void RenderReplaced::setIntrinsicSize(const IntSize& size)

{

    m_intrinsicSize = size;

}

void RenderReplaced::adjustOverflowForBoxShadow()

{

    if (ShadowData* boxShadow = style()->boxShadow()) {

        if (!gOverflowRectMap)

            gOverflowRectMap = new OverflowRectMap();

        IntRect shadow = borderBox();

        shadow.move(boxShadow->x, boxShadow->y);

        shadow.inflate(boxShadow->blur);

        shadow.unite(borderBox());

        gOverflowRectMap->set(this, shadow);

        m_hasOverflow = true;

        return;

    }

    if (m_hasOverflow) {

        gOverflowRectMap->remove(this);

        m_hasOverflow = false;

    }

}

int RenderReplaced::overflowHeight(bool includeInterior) const

{

    if (m_hasOverflow) {

        IntRect *r = &gOverflowRectMap->find(this)->second;

        return r->height() + r->y();

    }

    return height();

}

int RenderReplaced::overflowWidth(bool includeInterior) const

{

    if (m_hasOverflow) {

        IntRect *r = &gOverflowRectMap->find(this)->second;

        return r->width() + r->x();

    }

    return width();

}

int RenderReplaced::overflowLeft(bool includeInterior) const

{

    if (m_hasOverflow)

        return gOverflowRectMap->get(this).x();

    return 0;

}

int RenderReplaced::overflowTop(bool includeInterior) const

{

    if (m_hasOverflow)

        return gOverflowRectMap->get(this).y();

    return 0;

}

IntRect RenderReplaced::overflowRect(bool includeInterior) const

{

    if (m_hasOverflow)

        return gOverflowRectMap->find(this)->second;

    return borderBox();

}

}