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/**
* @license
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {
EventHelperPluginApi,
UnsubscribeCallback,
} from '../../../api/event-helper';
import {PluginApi} from '../../../api/plugin';
import {appContext} from '../../../services/app-context';
export class GrEventHelper implements EventHelperPluginApi {
private readonly reporting = appContext.reportingService;
constructor(readonly plugin: PluginApi, readonly element: HTMLElement) {
this.reporting.trackApi(this.plugin, 'event', 'constructor');
}
/**
* Alias for @see onClick
*/
onTap(callback: (event: Event) => boolean) {
this.reporting.trackApi(this.plugin, 'event', 'onTap');
return this.onClick(callback);
}
/**
* Add a callback to element click or touch.
* The callback may return false to prevent event bubbling.
*/
onClick(callback: (event: Event) => boolean) {
this.reporting.trackApi(this.plugin, 'event', 'onClick');
return this._listen(this.element, callback);
}
_listen(
container: HTMLElement,
callback: (event: Event) => boolean
): UnsubscribeCallback {
const handler = (e: Event) => {
const path = e.composedPath();
if (!path) return;
if (path.indexOf(this.element) !== -1) {
let mayContinue = true;
try {
mayContinue = callback(e);
} catch (exception) {
console.warn(`Plugin error handing event: ${exception}`);
}
if (mayContinue === false) {
e.stopImmediatePropagation();
e.stopPropagation();
e.preventDefault();
}
}
};
container.addEventListener('click', handler);
const unsubscribe = () => container.removeEventListener('click', handler);
return unsubscribe;
}
}