mirror of
https://github.com/mozilla/gecko-dev.git
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259 lines
7.7 KiB
C++
259 lines
7.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "HTMLMeterElement.h"
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#include "mozilla/dom/HTMLMeterElementBinding.h"
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NS_IMPL_NS_NEW_HTML_ELEMENT(Meter)
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namespace mozilla::dom {
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static const double kDefaultValue = 0.0;
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static const double kDefaultMin = 0.0;
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static const double kDefaultMax = 1.0;
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HTMLMeterElement::HTMLMeterElement(
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
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: nsGenericHTMLElement(std::move(aNodeInfo)) {}
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HTMLMeterElement::~HTMLMeterElement() = default;
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NS_IMPL_ELEMENT_CLONE(HTMLMeterElement)
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static bool IsInterestingAttr(int32_t aNamespaceID, nsAtom* aAttribute) {
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if (aNamespaceID != kNameSpaceID_None) {
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return false;
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}
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return aAttribute == nsGkAtoms::value || aAttribute == nsGkAtoms::max ||
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aAttribute == nsGkAtoms::min || aAttribute == nsGkAtoms::low ||
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aAttribute == nsGkAtoms::high || aAttribute == nsGkAtoms::optimum;
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}
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bool HTMLMeterElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
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const nsAString& aValue,
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nsIPrincipal* aMaybeScriptedPrincipal,
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nsAttrValue& aResult) {
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if (IsInterestingAttr(aNamespaceID, aAttribute)) {
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return aResult.ParseDoubleValue(aValue);
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}
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return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
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aMaybeScriptedPrincipal, aResult);
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}
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void HTMLMeterElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
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const nsAttrValue* aValue,
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const nsAttrValue* aOldValue,
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nsIPrincipal* aSubjectPrincipal,
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bool aNotify) {
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if (IsInterestingAttr(aNameSpaceID, aName)) {
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UpdateOptimumState(aNotify);
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}
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nsGenericHTMLElement::AfterSetAttr(aNameSpaceID, aName, aValue, aOldValue,
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aSubjectPrincipal, aNotify);
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}
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void HTMLMeterElement::UpdateOptimumState(bool aNotify) {
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AutoStateChangeNotifier notifier(*this, aNotify);
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RemoveStatesSilently(ElementState::METER_OPTIMUM_STATES);
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AddStatesSilently(GetOptimumState());
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}
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double HTMLMeterElement::Min() const {
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/**
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* If the attribute min is defined, the minimum is this value.
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* Otherwise, the minimum is the default value.
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*/
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const nsAttrValue* attrMin = mAttrs.GetAttr(nsGkAtoms::min);
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if (attrMin && attrMin->Type() == nsAttrValue::eDoubleValue) {
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return attrMin->GetDoubleValue();
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}
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return kDefaultMin;
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}
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double HTMLMeterElement::Max() const {
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/**
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* If the attribute max is defined, the maximum is this value.
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* Otherwise, the maximum is the default value.
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* If the maximum value is less than the minimum value,
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* the maximum value is the same as the minimum value.
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*/
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double max;
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const nsAttrValue* attrMax = mAttrs.GetAttr(nsGkAtoms::max);
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if (attrMax && attrMax->Type() == nsAttrValue::eDoubleValue) {
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max = attrMax->GetDoubleValue();
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} else {
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max = kDefaultMax;
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}
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return std::max(max, Min());
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}
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double HTMLMeterElement::Value() const {
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/**
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* If the attribute value is defined, the actual value is this value.
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* Otherwise, the actual value is the default value.
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* If the actual value is less than the minimum value,
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* the actual value is the same as the minimum value.
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* If the actual value is greater than the maximum value,
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* the actual value is the same as the maximum value.
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*/
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double value;
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const nsAttrValue* attrValue = mAttrs.GetAttr(nsGkAtoms::value);
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if (attrValue && attrValue->Type() == nsAttrValue::eDoubleValue) {
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value = attrValue->GetDoubleValue();
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} else {
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value = kDefaultValue;
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}
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double min = Min();
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if (value <= min) {
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return min;
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}
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return std::min(value, Max());
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}
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double HTMLMeterElement::Position() const {
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const double max = Max();
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const double min = Min();
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const double value = Value();
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double range = max - min;
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return range != 0.0 ? (value - min) / range : 1.0;
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}
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double HTMLMeterElement::Low() const {
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/**
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* If the low value is defined, the low value is this value.
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* Otherwise, the low value is the minimum value.
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* If the low value is less than the minimum value,
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* the low value is the same as the minimum value.
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* If the low value is greater than the maximum value,
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* the low value is the same as the maximum value.
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*/
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double min = Min();
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const nsAttrValue* attrLow = mAttrs.GetAttr(nsGkAtoms::low);
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if (!attrLow || attrLow->Type() != nsAttrValue::eDoubleValue) {
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return min;
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}
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double low = attrLow->GetDoubleValue();
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if (low <= min) {
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return min;
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}
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return std::min(low, Max());
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}
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double HTMLMeterElement::High() const {
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/**
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* If the high value is defined, the high value is this value.
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* Otherwise, the high value is the maximum value.
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* If the high value is less than the low value,
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* the high value is the same as the low value.
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* If the high value is greater than the maximum value,
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* the high value is the same as the maximum value.
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*/
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double max = Max();
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const nsAttrValue* attrHigh = mAttrs.GetAttr(nsGkAtoms::high);
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if (!attrHigh || attrHigh->Type() != nsAttrValue::eDoubleValue) {
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return max;
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}
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double high = attrHigh->GetDoubleValue();
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if (high >= max) {
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return max;
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}
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return std::max(high, Low());
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}
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double HTMLMeterElement::Optimum() const {
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/**
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* If the optimum value is defined, the optimum value is this value.
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* Otherwise, the optimum value is the midpoint between
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* the minimum value and the maximum value :
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* min + (max - min)/2 = (min + max)/2
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* If the optimum value is less than the minimum value,
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* the optimum value is the same as the minimum value.
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* If the optimum value is greater than the maximum value,
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* the optimum value is the same as the maximum value.
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*/
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double max = Max();
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double min = Min();
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const nsAttrValue* attrOptimum = mAttrs.GetAttr(nsGkAtoms::optimum);
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if (!attrOptimum || attrOptimum->Type() != nsAttrValue::eDoubleValue) {
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return (min + max) / 2.0;
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}
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double optimum = attrOptimum->GetDoubleValue();
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if (optimum <= min) {
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return min;
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}
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return std::min(optimum, max);
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}
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ElementState HTMLMeterElement::GetOptimumState() const {
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/*
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* If the optimum value is in [minimum, low[,
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* return if the value is in optimal, suboptimal or sub-suboptimal region
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*
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* If the optimum value is in [low, high],
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* return if the value is in optimal or suboptimal region
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*
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* If the optimum value is in ]high, maximum],
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* return if the value is in optimal, suboptimal or sub-suboptimal region
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*/
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double value = Value();
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double low = Low();
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double high = High();
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double optimum = Optimum();
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if (optimum < low) {
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if (value < low) {
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return ElementState::OPTIMUM;
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}
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if (value <= high) {
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return ElementState::SUB_OPTIMUM;
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}
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return ElementState::SUB_SUB_OPTIMUM;
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}
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if (optimum > high) {
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if (value > high) {
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return ElementState::OPTIMUM;
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}
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if (value >= low) {
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return ElementState::SUB_OPTIMUM;
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}
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return ElementState::SUB_SUB_OPTIMUM;
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}
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// optimum in [low, high]
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if (value >= low && value <= high) {
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return ElementState::OPTIMUM;
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}
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return ElementState::SUB_OPTIMUM;
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}
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JSObject* HTMLMeterElement::WrapNode(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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return HTMLMeterElement_Binding::Wrap(aCx, this, aGivenProto);
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}
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} // namespace mozilla::dom
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