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18 lines
966 B
JavaScript
18 lines
966 B
JavaScript
"use strict";
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// This mixin doesn't have an IDL equivalent, but since MouseEvent and KeyboardEvent implement getModifierState() the
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// same way, its implementation is shared here.
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class EventModifierMixinImpl {
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// Event's constructor assumes all options correspond to IDL attributes with the same names, and sets them on `this`.
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// That is not the case for these modifier boolean options, but since the options are set on `this` anyway we'll
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// access them that way. The spec doesn't say much about the case where keyArg is not one of the valid ones
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// (https://w3c.github.io/uievents-key/#keys-modifier), but at least Chrome returns false for invalid modifiers. Since
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// these invalid modifiers will be undefined on `this` (thus `false` after casting it to boolean), we don't need to do
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// extra checking for validity.
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getModifierState(keyArg) {
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return Boolean(this[`modifier${keyArg}`]);
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}
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}
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exports.implementation = EventModifierMixinImpl;
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