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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "HTMLMeterElement.h"
#include "mozilla/EventStates.h"
#include "mozilla/dom/HTMLMeterElementBinding.h"
NS_IMPL_NS_NEW_HTML_ELEMENT(Meter)
namespace mozilla {
namespace dom {
const double HTMLMeterElement::kDefaultValue = 0.0;
const double HTMLMeterElement::kDefaultMin = 0.0;
const double HTMLMeterElement::kDefaultMax = 1.0;
HTMLMeterElement::HTMLMeterElement(
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: nsGenericHTMLElement(std::move(aNodeInfo)) {}
HTMLMeterElement::~HTMLMeterElement() = default;
NS_IMPL_ELEMENT_CLONE(HTMLMeterElement)
EventStates HTMLMeterElement::IntrinsicState() const {
EventStates state = nsGenericHTMLElement::IntrinsicState();
state |= GetOptimumState();
return state;
}
bool HTMLMeterElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
const nsAString& aValue,
nsIPrincipal* aMaybeScriptedPrincipal,
nsAttrValue& aResult) {
if (aNamespaceID == kNameSpaceID_None) {
if (aAttribute == nsGkAtoms::value || aAttribute == nsGkAtoms::max ||
aAttribute == nsGkAtoms::min || aAttribute == nsGkAtoms::low ||
aAttribute == nsGkAtoms::high || aAttribute == nsGkAtoms::optimum) {
return aResult.ParseDoubleValue(aValue);
}
}
return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
aMaybeScriptedPrincipal, aResult);
}
/*
* Value getters :
* const getters used by XPCOM methods and by IntrinsicState
*/
double HTMLMeterElement::Min() const {
/**
* If the attribute min is defined, the minimum is this value.
* Otherwise, the minimum is the default value.
*/
const nsAttrValue* attrMin = mAttrs.GetAttr(nsGkAtoms::min);
if (attrMin && attrMin->Type() == nsAttrValue::eDoubleValue) {
return attrMin->GetDoubleValue();
}
return kDefaultMin;
}
double HTMLMeterElement::Max() const {
/**
* If the attribute max is defined, the maximum is this value.
* Otherwise, the maximum is the default value.
* If the maximum value is less than the minimum value,
* the maximum value is the same as the minimum value.
*/
double max;
const nsAttrValue* attrMax = mAttrs.GetAttr(nsGkAtoms::max);
if (attrMax && attrMax->Type() == nsAttrValue::eDoubleValue) {
max = attrMax->GetDoubleValue();
} else {
max = kDefaultMax;
}
return std::max(max, Min());
}
double HTMLMeterElement::Value() const {
/**
* If the attribute value is defined, the actual value is this value.
* Otherwise, the actual value is the default value.
* If the actual value is less than the minimum value,
* the actual value is the same as the minimum value.
* If the actual value is greater than the maximum value,
* the actual value is the same as the maximum value.
*/
double value;
const nsAttrValue* attrValue = mAttrs.GetAttr(nsGkAtoms::value);
if (attrValue && attrValue->Type() == nsAttrValue::eDoubleValue) {
value = attrValue->GetDoubleValue();
} else {
value = kDefaultValue;
}
double min = Min();
if (value <= min) {
return min;
}
return std::min(value, Max());
}
double HTMLMeterElement::Low() const {
/**
* If the low value is defined, the low value is this value.
* Otherwise, the low value is the minimum value.
* If the low value is less than the minimum value,
* the low value is the same as the minimum value.
* If the low value is greater than the maximum value,
* the low value is the same as the maximum value.
*/
double min = Min();
const nsAttrValue* attrLow = mAttrs.GetAttr(nsGkAtoms::low);
if (!attrLow || attrLow->Type() != nsAttrValue::eDoubleValue) {
return min;
}
double low = attrLow->GetDoubleValue();
if (low <= min) {
return min;
}
return std::min(low, Max());
}
double HTMLMeterElement::High() const {
/**
* If the high value is defined, the high value is this value.
* Otherwise, the high value is the maximum value.
* If the high value is less than the low value,
* the high value is the same as the low value.
* If the high value is greater than the maximum value,
* the high value is the same as the maximum value.
*/
double max = Max();
const nsAttrValue* attrHigh = mAttrs.GetAttr(nsGkAtoms::high);
if (!attrHigh || attrHigh->Type() != nsAttrValue::eDoubleValue) {
return max;
}
double high = attrHigh->GetDoubleValue();
if (high >= max) {
return max;
}
return std::max(high, Low());
}
double HTMLMeterElement::Optimum() const {
/**
* If the optimum value is defined, the optimum value is this value.
* Otherwise, the optimum value is the midpoint between
* the minimum value and the maximum value :
* min + (max - min)/2 = (min + max)/2
* If the optimum value is less than the minimum value,
* the optimum value is the same as the minimum value.
* If the optimum value is greater than the maximum value,
* the optimum value is the same as the maximum value.
*/
double max = Max();
double min = Min();
const nsAttrValue* attrOptimum = mAttrs.GetAttr(nsGkAtoms::optimum);
if (!attrOptimum || attrOptimum->Type() != nsAttrValue::eDoubleValue) {
return (min + max) / 2.0;
}
double optimum = attrOptimum->GetDoubleValue();
if (optimum <= min) {
return min;
}
return std::min(optimum, max);
}
EventStates HTMLMeterElement::GetOptimumState() const {
/*
* If the optimum value is in [minimum, low[,
* return if the value is in optimal, suboptimal or sub-suboptimal region
*
* If the optimum value is in [low, high],
* return if the value is in optimal or suboptimal region
*
* If the optimum value is in ]high, maximum],
* return if the value is in optimal, suboptimal or sub-suboptimal region
*/
double value = Value();
double low = Low();
double high = High();
double optimum = Optimum();
if (optimum < low) {
if (value < low) {
return NS_EVENT_STATE_OPTIMUM;
}
if (value <= high) {
return NS_EVENT_STATE_SUB_OPTIMUM;
}
return NS_EVENT_STATE_SUB_SUB_OPTIMUM;
}
if (optimum > high) {
if (value > high) {
return NS_EVENT_STATE_OPTIMUM;
}
if (value >= low) {
return NS_EVENT_STATE_SUB_OPTIMUM;
}
return NS_EVENT_STATE_SUB_SUB_OPTIMUM;
}
// optimum in [low, high]
if (value >= low && value <= high) {
return NS_EVENT_STATE_OPTIMUM;
}
return NS_EVENT_STATE_SUB_OPTIMUM;
}
JSObject* HTMLMeterElement::WrapNode(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return HTMLMeterElement_Binding::Wrap(aCx, this, aGivenProto);
}
} // namespace dom
} // namespace mozilla