"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) {
|
return Boolean(this[`modifier${keyArg}`]);
|
}
|
}
|
|
exports.implementation = EventModifierMixinImpl;
|
