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-rw-r--r--dom/html/HTMLMeterElement.cpp259
1 files changed, 259 insertions, 0 deletions
diff --git a/dom/html/HTMLMeterElement.cpp b/dom/html/HTMLMeterElement.cpp
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+++ b/dom/html/HTMLMeterElement.cpp
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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/dom/HTMLMeterElementBinding.h"
+
+NS_IMPL_NS_NEW_HTML_ELEMENT(Meter)
+
+namespace mozilla::dom {
+
+static const double kDefaultValue = 0.0;
+static const double kDefaultMin = 0.0;
+static const double kDefaultMax = 1.0;
+
+HTMLMeterElement::HTMLMeterElement(
+ already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
+ : nsGenericHTMLElement(std::move(aNodeInfo)) {}
+
+HTMLMeterElement::~HTMLMeterElement() = default;
+
+NS_IMPL_ELEMENT_CLONE(HTMLMeterElement)
+
+static bool IsInterestingAttr(int32_t aNamespaceID, nsAtom* aAttribute) {
+ if (aNamespaceID != kNameSpaceID_None) {
+ return false;
+ }
+ return aAttribute == nsGkAtoms::value || aAttribute == nsGkAtoms::max ||
+ aAttribute == nsGkAtoms::min || aAttribute == nsGkAtoms::low ||
+ aAttribute == nsGkAtoms::high || aAttribute == nsGkAtoms::optimum;
+}
+
+bool HTMLMeterElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
+ const nsAString& aValue,
+ nsIPrincipal* aMaybeScriptedPrincipal,
+ nsAttrValue& aResult) {
+ if (IsInterestingAttr(aNamespaceID, aAttribute)) {
+ return aResult.ParseDoubleValue(aValue);
+ }
+ return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
+ aMaybeScriptedPrincipal, aResult);
+}
+
+void HTMLMeterElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
+ const nsAttrValue* aValue,
+ const nsAttrValue* aOldValue,
+ nsIPrincipal* aSubjectPrincipal,
+ bool aNotify) {
+ if (IsInterestingAttr(aNameSpaceID, aName)) {
+ UpdateOptimumState(aNotify);
+ }
+ nsGenericHTMLElement::AfterSetAttr(aNameSpaceID, aName, aValue, aOldValue,
+ aSubjectPrincipal, aNotify);
+}
+
+void HTMLMeterElement::UpdateOptimumState(bool aNotify) {
+ AutoStateChangeNotifier notifier(*this, aNotify);
+ RemoveStatesSilently(ElementState::METER_OPTIMUM_STATES);
+ AddStatesSilently(GetOptimumState());
+}
+
+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::Position() const {
+ const double max = Max();
+ const double min = Min();
+ const double value = Value();
+
+ double range = max - min;
+ return range != 0.0 ? (value - min) / range : 1.0;
+}
+
+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);
+}
+
+ElementState 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 ElementState::OPTIMUM;
+ }
+ if (value <= high) {
+ return ElementState::SUB_OPTIMUM;
+ }
+ return ElementState::SUB_SUB_OPTIMUM;
+ }
+ if (optimum > high) {
+ if (value > high) {
+ return ElementState::OPTIMUM;
+ }
+ if (value >= low) {
+ return ElementState::SUB_OPTIMUM;
+ }
+ return ElementState::SUB_SUB_OPTIMUM;
+ }
+ // optimum in [low, high]
+ if (value >= low && value <= high) {
+ return ElementState::OPTIMUM;
+ }
+ return ElementState::SUB_OPTIMUM;
+}
+
+JSObject* HTMLMeterElement::WrapNode(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto) {
+ return HTMLMeterElement_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+} // namespace mozilla::dom