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Contents
"use strict";
// This mixin doesn't have an IDL equivalent, but since MouseEvent and KeyboardEvent implement getModifierState() the
// same way, its implementation is shared here.
class EventModifierMixinImpl {
// Event's constructor assumes all options correspond to IDL attributes with the same names, and sets them on `this`.
// That is not the case for these modifier boolean options, but since the options are set on `this` anyway we'll
// access them that way. The spec doesn't say much about the case where keyArg is not one of the valid ones
// (https://w3c.github.io/uievents-key/#keys-modifier), but at least Chrome returns false for invalid modifiers. Since
// these invalid modifiers will be undefined on `this` (thus `false` after casting it to boolean), we don't need to do
// extra checking for validity.
getModifierState(keyArg) {
if (keyArg === "Control") {
return Boolean(this.ctrlKey);
}
if (["Alt", "Meta", "Shift"].includes(keyArg)) {
return Boolean(this[`${keyArg.toLowerCase()}Key`]);
}
return Boolean(this[`modifier${keyArg}`]);
}
}
exports.implementation = EventModifierMixinImpl;
Version data entries
26 entries across 26 versions & 1 rubygems