blob: 06b4a721299a9916ec3b283de1b6e318ef55a42b [file] [log] [blame]
/**
* @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.
*/
(function() {
'use strict';
/**
* fired when the selected value of the dropdown changes
*
* @event {change}
*/
const Defs = {};
/**
* Requred values are text and value. mobileText and triggerText will
* fall back to text if not provided.
*
* If bottomText is not provided, nothing will display on the second
* line.
*
* If date is not provided, nothing will be displayed in its place.
*
* @typedef {{
* text: string,
* value: (string|number),
* bottomText: (string|undefined),
* triggerText: (string|undefined),
* mobileText: (string|undefined),
* date: (!Date|undefined),
* }}
*/
Defs.item;
/** @extends Polymer.Element */
class GrDropdownList extends Polymer.GestureEventListeners(
Polymer.LegacyElementMixin(
Polymer.Element)) {
static get is() { return 'gr-dropdown-list'; }
/**
* Fired when the selected value changes
*
* @event value-change
*
* @property {string|number} value
*/
static get properties() {
return {
initialCount: Number,
/** @type {!Array<!Defs.item>} */
items: Object,
text: String,
disabled: {
type: Boolean,
value: false,
},
value: {
type: String,
notify: true,
},
};
}
static get observers() {
return [
'_handleValueChange(value, items)',
];
}
/**
* Handle a click on the iron-dropdown element.
*
* @param {!Event} e
*/
_handleDropdownClick(e) {
// async is needed so that that the click event is fired before the
// dropdown closes (This was a bug for touch devices).
this.async(() => {
this.$.dropdown.close();
}, 1);
}
/**
* Handle a click on the button to open the dropdown.
*
* @param {!Event} e
*/
_showDropdownTapHandler(e) {
this._open();
}
/**
* Open the dropdown.
*/
_open() {
this.$.dropdown.open();
}
_computeMobileText(item) {
return item.mobileText ? item.mobileText : item.text;
}
_handleValueChange(value, items) {
// Polymer 2: check for undefined
if ([value, items].some(arg => arg === undefined)) {
return;
}
if (!value) { return; }
const selectedObj = items.find(item => item.value + '' === value + '');
if (!selectedObj) { return; }
this.text = selectedObj.triggerText? selectedObj.triggerText :
selectedObj.text;
this.dispatchEvent(new CustomEvent('value-change', {
detail: {value},
bubbles: false,
}));
}
}
customElements.define(GrDropdownList.is, GrDropdownList);
})();