/**
 * @license
 * Copyright (C) 2018 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 '../../../styles/shared-styles.js';
import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners.js';
import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin.js';
import {PolymerElement} from '@polymer/polymer/polymer-element.js';
import {htmlTemplate} from './gr-key-binding-display_html.js';

/** @extends PolymerElement */
class GrKeyBindingDisplay extends GestureEventListeners(
    LegacyElementMixin(
        PolymerElement)) {
  static get template() { return htmlTemplate; }

  static get is() { return 'gr-key-binding-display'; }

  static get properties() {
    return {
      /** @type {Array<Array<string>>}
       * Each entry in the binding represents an array that is a keyboard
       * shortcut containing [modifier, combination]
       */
      binding: Array,
    };
  }

  _computeModifiers(binding) {
    return binding.slice(0, binding.length - 1);
  }

  _computeKey(binding) {
    return binding[binding.length - 1];
  }
}

customElements.define(GrKeyBindingDisplay.is, GrKeyBindingDisplay);