/*
 * Copyright (C) 2006, 2007, 2008, 2009, 2010 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 Publicw
 * 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 "core/layout/LayoutSlider.h"

#include "core/InputTypeNames.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/html/HTMLInputElement.h"
#include "core/html/shadow/ShadowElementNames.h"
#include "core/html/shadow/SliderThumbElement.h"
#include "core/layout/LayoutSliderThumb.h"
#include "wtf/MathExtras.h"

using namespace::std;

namespace blink {

const int LayoutSlider::defaultTrackLength = 129;

LayoutSlider::LayoutSlider(HTMLInputElement* element)
    : LayoutFlexibleBox(element)
{
    // We assume LayoutSlider works only with <input type=range>.
    ASSERT(element->type() == InputTypeNames::range);
}

LayoutSlider::~LayoutSlider()
{
}

int LayoutSlider::baselinePosition(FontBaseline, bool /*firstLine*/, LineDirectionMode, LinePositionMode linePositionMode) const
{
    ASSERT(linePositionMode == PositionOnContainingLine);
    // FIXME: Patch this function for writing-mode.
    return size().height() + marginTop();
}

void LayoutSlider::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
    maxLogicalWidth = LayoutUnit(defaultTrackLength * style()->effectiveZoom());
    if (!style()->width().hasPercent())
        minLogicalWidth = maxLogicalWidth;
}

inline SliderThumbElement* LayoutSlider::sliderThumbElement() const
{
    return toSliderThumbElement(toElement(node())->userAgentShadowRoot()->getElementById(ShadowElementNames::sliderThumb()));
}

void LayoutSlider::layout()
{
    // FIXME: Find a way to cascade appearance.
    // http://webkit.org/b/62535
    LayoutBox* thumbBox = sliderThumbElement()->layoutBox();
    if (thumbBox && thumbBox->isSliderThumb())
        toLayoutSliderThumb(thumbBox)->updateAppearance(styleRef());

    LayoutFlexibleBox::layout();
}

bool LayoutSlider::inDragMode() const
{
    return sliderThumbElement()->active();
}

} // namespace blink