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/*
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
*
* 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 "core/html/HTMLMeterElement.h"
#include "bindings/core/v8/ExceptionMessages.h"
#include "bindings/core/v8/ExceptionState.h"
#include "bindings/core/v8/ExceptionStatePlaceholder.h"
#include "core/HTMLNames.h"
#include "core/dom/ExceptionCode.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/frame/UseCounter.h"
#include "core/html/parser/HTMLParserIdioms.h"
#include "core/html/shadow/MeterShadowElement.h"
#include "core/layout/LayoutMeter.h"
#include "core/layout/LayoutTheme.h"
namespace blink {
using namespace HTMLNames;
HTMLMeterElement::HTMLMeterElement(Document& document)
: LabelableElement(meterTag, document)
{
UseCounter::count(document, UseCounter::MeterElement);
}
HTMLMeterElement::~HTMLMeterElement()
{
}
PassRefPtrWillBeRawPtr<HTMLMeterElement> HTMLMeterElement::create(Document& document)
{
RefPtrWillBeRawPtr<HTMLMeterElement> meter = adoptRefWillBeNoop(new HTMLMeterElement(document));
meter->ensureUserAgentShadowRoot();
return meter.release();
}
LayoutObject* HTMLMeterElement::createLayoutObject(const ComputedStyle& style)
{
switch (style.appearance()) {
case ContinuousCapacityLevelIndicatorPart:
UseCounter::count(document(), UseCounter::MeterElementWithContinuousCapacityAppearance);
break;
case DiscreteCapacityLevelIndicatorPart:
UseCounter::count(document(), UseCounter::MeterElementWithDiscreteCapacityAppearance);
break;
case MeterPart:
UseCounter::count(document(), UseCounter::MeterElementWithMeterAppearance);
break;
case NoControlPart:
UseCounter::count(document(), UseCounter::MeterElementWithNoneAppearance);
break;
case RatingLevelIndicatorPart:
UseCounter::count(document(), UseCounter::MeterElementWithRatingAppearance);
break;
case RelevancyLevelIndicatorPart:
UseCounter::count(document(), UseCounter::MeterElementWithRelevancyAppearance);
break;
default:
break;
}
if (openShadowRoot() || !LayoutTheme::theme().supportsMeter(style.appearance()))
return LayoutObject::createObject(this, style);
return new LayoutMeter(this);
}
void HTMLMeterElement::parseAttribute(const QualifiedName& name, const AtomicString& oldValue, const AtomicString& value)
{
if (name == valueAttr || name == minAttr || name == maxAttr || name == lowAttr || name == highAttr || name == optimumAttr)
didElementStateChange();
else
LabelableElement::parseAttribute(name, oldValue, value);
}
double HTMLMeterElement::value() const
{
double value = getFloatingPointAttribute(valueAttr, 0);
return std::min(std::max(value, min()), max());
}
void HTMLMeterElement::setValue(double value)
{
setFloatingPointAttribute(valueAttr, value);
}
double HTMLMeterElement::min() const
{
return getFloatingPointAttribute(minAttr, 0);
}
void HTMLMeterElement::setMin(double min)
{
setFloatingPointAttribute(minAttr, min);
}
double HTMLMeterElement::max() const
{
return std::max(getFloatingPointAttribute(maxAttr, std::max(1.0, min())), min());
}
void HTMLMeterElement::setMax(double max)
{
setFloatingPointAttribute(maxAttr, max);
}
double HTMLMeterElement::low() const
{
double low = getFloatingPointAttribute(lowAttr, min());
return std::min(std::max(low, min()), max());
}
void HTMLMeterElement::setLow(double low)
{
setFloatingPointAttribute(lowAttr, low);
}
double HTMLMeterElement::high() const
{
double high = getFloatingPointAttribute(highAttr, max());
return std::min(std::max(high, low()), max());
}
void HTMLMeterElement::setHigh(double high)
{
setFloatingPointAttribute(highAttr, high);
}
double HTMLMeterElement::optimum() const
{
double optimum = getFloatingPointAttribute(optimumAttr, (max() + min()) / 2);
return std::min(std::max(optimum, min()), max());
}
void HTMLMeterElement::setOptimum(double optimum)
{
setFloatingPointAttribute(optimumAttr, optimum);
}
HTMLMeterElement::GaugeRegion HTMLMeterElement::gaugeRegion() const
{
double lowValue = low();
double highValue = high();
double theValue = value();
double optimumValue = optimum();
if (optimumValue < lowValue) {
// The optimum range stays under low
if (theValue <= lowValue)
return GaugeRegionOptimum;
if (theValue <= highValue)
return GaugeRegionSuboptimal;
return GaugeRegionEvenLessGood;
}
if (highValue < optimumValue) {
// The optimum range stays over high
if (highValue <= theValue)
return GaugeRegionOptimum;
if (lowValue <= theValue)
return GaugeRegionSuboptimal;
return GaugeRegionEvenLessGood;
}
// The optimum range stays between high and low.
// According to the standard, <meter> never show GaugeRegionEvenLessGood in this case
// because the value is never less or greater than min or max.
if (lowValue <= theValue && theValue <= highValue)
return GaugeRegionOptimum;
return GaugeRegionSuboptimal;
}
double HTMLMeterElement::valueRatio() const
{
double min = this->min();
double max = this->max();
double value = this->value();
if (max <= min)
return 0;
return (value - min) / (max - min);
}
void HTMLMeterElement::didElementStateChange()
{
m_value->setWidthPercentage(valueRatio()*100);
m_value->updatePseudo();
if (LayoutMeter* layoutMeter = this->layoutMeter())
layoutMeter->updateFromElement();
}
LayoutMeter* HTMLMeterElement::layoutMeter() const
{
if (layoutObject() && layoutObject()->isMeter())
return toLayoutMeter(layoutObject());
LayoutObject* layoutObject = userAgentShadowRoot()->firstChild()->layoutObject();
return toLayoutMeter(layoutObject);
}
void HTMLMeterElement::didAddUserAgentShadowRoot(ShadowRoot& root)
{
ASSERT(!m_value);
RefPtrWillBeRawPtr<MeterInnerElement> inner = MeterInnerElement::create(document());
root.appendChild(inner);
RefPtrWillBeRawPtr<MeterBarElement> bar = MeterBarElement::create(document());
m_value = MeterValueElement::create(document());
m_value->setWidthPercentage(0);
m_value->updatePseudo();
bar->appendChild(m_value);
inner->appendChild(bar);
}
void HTMLMeterElement::willAddFirstAuthorShadowRoot()
{
ASSERT(RuntimeEnabledFeatures::authorShadowDOMForAnyElementEnabled());
lazyReattachIfAttached();
}
DEFINE_TRACE(HTMLMeterElement)
{
visitor->trace(m_value);
LabelableElement::trace(visitor);
}
} // namespace blink