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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 "config.h"
#include "HTMLMeterElement.h"
#if ENABLE(METER_ELEMENT)
#include "Attribute.h"
#include "ElementIterator.h"
#include "HTMLDivElement.h"
#include "HTMLFormElement.h"
#include "HTMLNames.h"
#include "HTMLParserIdioms.h"
#include "HTMLStyleElement.h"
#include "Page.h"
#include "RenderMeter.h"
#include "RenderTheme.h"
#include "ShadowRoot.h"
#include "UserAgentStyleSheets.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(HTMLMeterElement);
using namespace HTMLNames;
HTMLMeterElement::HTMLMeterElement(const QualifiedName& tagName, Document& document)
: LabelableElement(tagName, document)
{
ASSERT(hasTagName(meterTag));
}
HTMLMeterElement::~HTMLMeterElement() = default;
Ref<HTMLMeterElement> HTMLMeterElement::create(const QualifiedName& tagName, Document& document)
{
Ref<HTMLMeterElement> meter = adoptRef(*new HTMLMeterElement(tagName, document));
meter->ensureUserAgentShadowRoot();
return meter;
}
RenderPtr<RenderElement> HTMLMeterElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
{
if (!RenderTheme::singleton().supportsMeter(style.appearance()))
return RenderElement::createFor(*this, WTFMove(style));
return createRenderer<RenderMeter>(*this, WTFMove(style));
}
bool HTMLMeterElement::childShouldCreateRenderer(const Node& child) const
{
return !is<RenderMeter>(renderer()) && HTMLElement::childShouldCreateRenderer(child);
}
void HTMLMeterElement::parseAttribute(const QualifiedName& name, const AtomString& value)
{
if (name == valueAttr || name == minAttr || name == maxAttr || name == lowAttr || name == highAttr || name == optimumAttr)
didElementStateChange();
else
LabelableElement::parseAttribute(name, value);
}
double HTMLMeterElement::min() const
{
return parseToDoubleForNumberType(attributeWithoutSynchronization(minAttr), 0);
}
void HTMLMeterElement::setMin(double min)
{
setAttributeWithoutSynchronization(minAttr, AtomString::number(min));
}
double HTMLMeterElement::max() const
{
return std::max(parseToDoubleForNumberType(attributeWithoutSynchronization(maxAttr), std::max(1.0, min())), min());
}
void HTMLMeterElement::setMax(double max)
{
setAttributeWithoutSynchronization(maxAttr, AtomString::number(max));
}
double HTMLMeterElement::value() const
{
double value = parseToDoubleForNumberType(attributeWithoutSynchronization(valueAttr), 0);
return std::min(std::max(value, min()), max());
}
void HTMLMeterElement::setValue(double value)
{
setAttributeWithoutSynchronization(valueAttr, AtomString::number(value));
}
double HTMLMeterElement::low() const
{
double low = parseToDoubleForNumberType(attributeWithoutSynchronization(lowAttr), min());
return std::min(std::max(low, min()), max());
}
void HTMLMeterElement::setLow(double low)
{
setAttributeWithoutSynchronization(lowAttr, AtomString::number(low));
}
double HTMLMeterElement::high() const
{
double high = parseToDoubleForNumberType(attributeWithoutSynchronization(highAttr), max());
return std::min(std::max(high, low()), max());
}
void HTMLMeterElement::setHigh(double high)
{
setAttributeWithoutSynchronization(highAttr, AtomString::number(high));
}
double HTMLMeterElement::optimum() const
{
double optimum = parseToDoubleForNumberType(attributeWithoutSynchronization(optimumAttr), (max() + min()) / 2);
return std::min(std::max(optimum, min()), max());
}
void HTMLMeterElement::setOptimum(double optimum)
{
setAttributeWithoutSynchronization(optimumAttr, AtomString::number(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);
}
static void setValueClass(HTMLElement& element, HTMLMeterElement::GaugeRegion gaugeRegion)
{
switch (gaugeRegion) {
case HTMLMeterElement::GaugeRegionOptimum:
element.setAttribute(HTMLNames::classAttr, "optimum");
element.setPseudo("-webkit-meter-optimum-value");
return;
case HTMLMeterElement::GaugeRegionSuboptimal:
element.setAttribute(HTMLNames::classAttr, "suboptimum");
element.setPseudo("-webkit-meter-suboptimum-value");
return;
case HTMLMeterElement::GaugeRegionEvenLessGood:
element.setAttribute(HTMLNames::classAttr, "even-less-good");
element.setPseudo("-webkit-meter-even-less-good-value");
return;
default:
ASSERT_NOT_REACHED();
}
}
void HTMLMeterElement::didElementStateChange()
{
m_value->setInlineStyleProperty(CSSPropertyWidth, valueRatio()*100, CSSUnitType::CSS_PERCENTAGE);
setValueClass(*m_value, gaugeRegion());
if (RenderMeter* render = renderMeter())
render->updateFromElement();
}
RenderMeter* HTMLMeterElement::renderMeter() const
{
if (is<RenderMeter>(renderer()))
return downcast<RenderMeter>(renderer());
return nullptr;
}
void HTMLMeterElement::didAddUserAgentShadowRoot(ShadowRoot& root)
{
ASSERT(!m_value);
static NeverDestroyed<String> shadowStyle(meterElementShadowUserAgentStyleSheet, String::ConstructFromLiteral);
auto style = HTMLStyleElement::create(HTMLNames::styleTag, document(), false);
style->setTextContent(shadowStyle);
root.appendChild(style);
// Pseudos are set to allow author styling.
auto inner = HTMLDivElement::create(document());
inner->setIdAttribute("inner");
inner->setPseudo("-webkit-meter-inner-element");
root.appendChild(inner);
auto bar = HTMLDivElement::create(document());
bar->setIdAttribute("bar");
bar->setPseudo("-webkit-meter-bar");
inner->appendChild(bar);
m_value = HTMLDivElement::create(document());
m_value->setIdAttribute("value");
bar->appendChild(*m_value);
didElementStateChange();
}
} // namespace
#endif