@gitlab/ui
Version:
GitLab UI Components
61 lines (54 loc) • 1.78 kB
JavaScript
import { assign, defineProperties, readonlyDescriptor, defineProperty } from './object';
class BvEvent {
constructor(type) {
let eventInit = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
// Start by emulating native Event constructor
if (!type) {
/* istanbul ignore next */
throw new TypeError(`Failed to construct '${this.constructor.name}'. 1 argument required, ${arguments.length} given.`);
}
// Merge defaults first, the eventInit, and the type last
// so it can't be overwritten
assign(this, BvEvent.Defaults, this.constructor.Defaults, eventInit, {
type
});
// Freeze some props as readonly, but leave them enumerable
defineProperties(this, {
type: readonlyDescriptor(),
cancelable: readonlyDescriptor(),
nativeEvent: readonlyDescriptor(),
target: readonlyDescriptor(),
relatedTarget: readonlyDescriptor(),
vueTarget: readonlyDescriptor(),
componentId: readonlyDescriptor()
});
// Create a private variable using closure scoping
let defaultPrevented = false;
// Recreate preventDefault method. One way setter
this.preventDefault = function preventDefault() {
if (this.cancelable) {
defaultPrevented = true;
}
};
// Create `defaultPrevented` publicly accessible prop that
// can only be altered by the preventDefault method
defineProperty(this, 'defaultPrevented', {
enumerable: true,
get() {
return defaultPrevented;
}
});
}
static get Defaults() {
return {
type: '',
cancelable: true,
nativeEvent: null,
target: null,
relatedTarget: null,
vueTarget: null,
componentId: null
};
}
}
export { BvEvent };