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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 "third_party/blink/renderer/core/html/html_meter_element.h"
#include "third_party/blink/renderer/core/dom/node_computed_style.h"
#include "third_party/blink/renderer/core/dom/shadow_root.h"
#include "third_party/blink/renderer/core/frame/web_feature.h"
#include "third_party/blink/renderer/core/html/html_div_element.h"
#include "third_party/blink/renderer/core/html/html_slot_element.h"
#include "third_party/blink/renderer/core/html/parser/html_parser_idioms.h"
#include "third_party/blink/renderer/core/html_names.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
#include "ui/base/ui_base_features.h"
namespace blink {
HTMLMeterElement::HTMLMeterElement(Document& document)
: HTMLElement(html_names::kMeterTag, document) {
UseCounter::Count(document, WebFeature::kMeterElement);
EnsureUserAgentShadowRoot();
}
HTMLMeterElement::~HTMLMeterElement() = default;
LayoutObject* HTMLMeterElement::CreateLayoutObject(const ComputedStyle& style,
LegacyLayout legacy) {
switch (style.EffectiveAppearance()) {
case kMeterPart:
UseCounter::Count(GetDocument(),
WebFeature::kMeterElementWithMeterAppearance);
break;
case kNoControlPart:
UseCounter::Count(GetDocument(),
WebFeature::kMeterElementWithNoneAppearance);
break;
default:
break;
}
return HTMLElement::CreateLayoutObject(style, legacy);
}
void HTMLMeterElement::ParseAttribute(
const AttributeModificationParams& params) {
const QualifiedName& name = params.name;
if (name == html_names::kValueAttr || name == html_names::kMinAttr ||
name == html_names::kMaxAttr || name == html_names::kLowAttr ||
name == html_names::kHighAttr || name == html_names::kOptimumAttr)
DidElementStateChange();
else
HTMLElement::ParseAttribute(params);
}
double HTMLMeterElement::value() const {
double value = GetFloatingPointAttribute(html_names::kValueAttr, 0);
return std::min(std::max(value, min()), max());
}
void HTMLMeterElement::setValue(double value) {
SetFloatingPointAttribute(html_names::kValueAttr, value);
}
double HTMLMeterElement::min() const {
return GetFloatingPointAttribute(html_names::kMinAttr, 0);
}
void HTMLMeterElement::setMin(double min) {
SetFloatingPointAttribute(html_names::kMinAttr, min);
}
double HTMLMeterElement::max() const {
return std::max(
GetFloatingPointAttribute(html_names::kMaxAttr, std::max(1.0, min())),
min());
}
void HTMLMeterElement::setMax(double max) {
SetFloatingPointAttribute(html_names::kMaxAttr, max);
}
double HTMLMeterElement::low() const {
double low = GetFloatingPointAttribute(html_names::kLowAttr, min());
return std::min(std::max(low, min()), max());
}
void HTMLMeterElement::setLow(double low) {
SetFloatingPointAttribute(html_names::kLowAttr, low);
}
double HTMLMeterElement::high() const {
double high = GetFloatingPointAttribute(html_names::kHighAttr, max());
return std::min(std::max(high, low()), max());
}
void HTMLMeterElement::setHigh(double high) {
SetFloatingPointAttribute(html_names::kHighAttr, high);
}
double HTMLMeterElement::optimum() const {
double optimum =
GetFloatingPointAttribute(html_names::kOptimumAttr, (max() + min()) / 2);
return std::min(std::max(optimum, min()), max());
}
void HTMLMeterElement::setOptimum(double optimum) {
SetFloatingPointAttribute(html_names::kOptimumAttr, optimum);
}
HTMLMeterElement::GaugeRegion HTMLMeterElement::GetGaugeRegion() const {
double low_value = low();
double high_value = high();
double the_value = value();
double optimum_value = optimum();
if (optimum_value < low_value) {
// The optimum range stays under low
if (the_value <= low_value)
return kGaugeRegionOptimum;
if (the_value <= high_value)
return kGaugeRegionSuboptimal;
return kGaugeRegionEvenLessGood;
}
if (high_value < optimum_value) {
// The optimum range stays over high
if (high_value <= the_value)
return kGaugeRegionOptimum;
if (low_value <= the_value)
return kGaugeRegionSuboptimal;
return kGaugeRegionEvenLessGood;
}
// 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 (low_value <= the_value && the_value <= high_value)
return kGaugeRegionOptimum;
return kGaugeRegionSuboptimal;
}
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() {
UpdateValueAppearance(ValueRatio() * 100);
}
void HTMLMeterElement::DidAddUserAgentShadowRoot(ShadowRoot& root) {
DCHECK(!value_);
auto* inner = MakeGarbageCollected<HTMLDivElement>(GetDocument());
inner->SetShadowPseudoId(AtomicString("-webkit-meter-inner-element"));
root.AppendChild(inner);
auto* bar = MakeGarbageCollected<HTMLDivElement>(GetDocument());
bar->SetShadowPseudoId(AtomicString("-webkit-meter-bar"));
value_ = MakeGarbageCollected<HTMLDivElement>(GetDocument());
UpdateValueAppearance(0);
bar->AppendChild(value_);
inner->AppendChild(bar);
auto* fallback = MakeGarbageCollected<HTMLDivElement>(GetDocument());
fallback->AppendChild(
HTMLSlotElement::CreateUserAgentDefaultSlot(GetDocument()));
fallback->SetShadowPseudoId(AtomicString("-internal-fallback"));
root.AppendChild(fallback);
}
void HTMLMeterElement::UpdateValueAppearance(double percentage) {
DEFINE_STATIC_LOCAL(AtomicString, optimum_pseudo_id,
("-webkit-meter-optimum-value"));
DEFINE_STATIC_LOCAL(AtomicString, suboptimum_pseudo_id,
("-webkit-meter-suboptimum-value"));
DEFINE_STATIC_LOCAL(AtomicString, even_less_good_pseudo_id,
("-webkit-meter-even-less-good-value"));
value_->SetInlineStyleProperty(CSSPropertyID::kWidth, percentage,
CSSPrimitiveValue::UnitType::kPercentage);
switch (GetGaugeRegion()) {
case kGaugeRegionOptimum:
value_->SetShadowPseudoId(optimum_pseudo_id);
break;
case kGaugeRegionSuboptimal:
value_->SetShadowPseudoId(suboptimum_pseudo_id);
break;
case kGaugeRegionEvenLessGood:
value_->SetShadowPseudoId(even_less_good_pseudo_id);
break;
}
}
bool HTMLMeterElement::CanContainRangeEndPoint() const {
GetDocument().UpdateStyleAndLayoutTreeForNode(this);
return GetComputedStyle() && !GetComputedStyle()->HasEffectiveAppearance();
}
void HTMLMeterElement::Trace(Visitor* visitor) const {
visitor->Trace(value_);
HTMLElement::Trace(visitor);
}
} // namespace blink
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