blob: 6b8789e0687a5877709da730b7aa76053a474d31 [file] [log] [blame]
/**
* @license
* Copyright (C) 2016 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 '@polymer/paper-button/paper-button';
import {spinnerStyles} from '../../../styles/gr-spinner-styles';
import {votingStyles} from '../../../styles/gr-voting-styles';
import {css, html, LitElement, PropertyValues} from 'lit';
import {customElement, property} from 'lit/decorators';
import {addShortcut, getEventPath, Key} from '../../../utils/dom-util';
import {getAppContext} from '../../../services/app-context';
declare global {
interface HTMLElementTagNameMap {
'gr-button': GrButton;
}
}
@customElement('gr-button')
export class GrButton extends LitElement {
// Private but used in tests.
readonly reporting = getAppContext().reportingService;
/**
* Should this button be rendered as a vote chip? Then we are applying
* the .voteChip class (see gr-voting-styles) to the paper-button.
*/
@property({type: Boolean, reflect: true})
voteChip = false;
// Note: don't assign a value to this, since constructor is called
// after created, the initial value maybe overridden by this
private initialTabindex?: string;
@property({type: Boolean, reflect: true, attribute: 'down-arrow'})
downArrow = false;
@property({type: Boolean, reflect: true})
link = false;
@property({type: Boolean, reflect: true})
loading = false;
@property({type: Boolean, reflect: true})
disabled: boolean | null = null;
static override get styles() {
return [
votingStyles,
spinnerStyles,
css`
/* general styles for all buttons */
:host {
--background-color: var(
--button-background-color,
var(--default-button-background-color)
);
--text-color: var(
--gr-button-text-color,
var(--default-button-text-color)
);
display: inline-block;
position: relative;
}
:host([hidden]) {
display: none;
}
:host([no-uppercase]) paper-button {
text-transform: none;
}
paper-button {
/* paper-button sets this to anti-aliased, which appears different than
bold font elsewhere on macOS. */
-webkit-font-smoothing: initial;
align-items: center;
background-color: var(--background-color);
color: var(--text-color);
display: flex;
font-family: var(--font-family, inherit);
/** Without this '.keyboard-focus' buttons will get bolded. */
font-weight: var(--font-weight-normal, inherit);
justify-content: center;
margin: var(--margin, 0);
min-width: var(--border, 0);
padding: var(--gr-button-padding, var(--spacing-s) var(--spacing-m));
}
paper-button[elevation='1'] {
box-shadow: var(--elevation-level-1);
}
paper-button[elevation='2'] {
box-shadow: var(--elevation-level-2);
}
paper-button[elevation='3'] {
box-shadow: var(--elevation-level-3);
}
paper-button[elevation='4'] {
box-shadow: var(--elevation-level-4);
}
paper-button[elevation='5'] {
box-shadow: var(--elevation-level-5);
}
paper-button:hover {
background: linear-gradient(rgba(0, 0, 0, 0.12), rgba(0, 0, 0, 0.12)),
var(--background-color);
}
/* Some mobile browsers treat focused element as hovered element.
As a result, element remains hovered after click (has grey background in default theme).
Use @media (hover:none) to remove background if
user's primary input mechanism can't hover over elements.
See: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/hover
Note 1: not all browsers support this media query
(see https://caniuse.com/#feat=css-media-interaction).
If browser doesn't support it, then the whole content of @media .. is ignored.
This is why the default behavior is placed outside of @media.
*/
@media (hover: none) {
paper-button:hover {
background: transparent;
}
}
:host([primary]) {
--background-color: var(--primary-button-background-color);
--text-color: var(--primary-button-text-color);
}
:host([link][primary]) {
--text-color: var(--primary-button-background-color);
}
/* Keep below color definition for primary so that this takes precedence
when disabled. */
:host([disabled]),
:host([loading]) {
--background-color: var(--disabled-button-background-color);
--text-color: var(--deemphasized-text-color);
cursor: default;
}
/* Styles for link buttons specifically */
:host([link]) {
--background-color: transparent;
--margin: 0;
}
:host([link]) paper-button {
padding: var(--gr-button-padding, var(--spacing-s));
}
:host([disabled][link]),
:host([loading][link]) {
--background-color: transparent;
--text-color: var(--deemphasized-text-color);
cursor: default;
}
/* Styles for the optional down arrow */
:host(:not([down-arrow])) .downArrow {
display: none;
}
:host([down-arrow]) .downArrow {
border-top: 0.36em solid #ccc;
border-left: 0.36em solid transparent;
border-right: 0.36em solid transparent;
margin-bottom: var(--spacing-xxs);
margin-left: var(--spacing-m);
transition: border-top-color 200ms;
}
:host([down-arrow]) paper-button:hover .downArrow {
border-top-color: var(--deemphasized-text-color);
}
`,
];
}
override render() {
return html`<paper-button
?raised="${!this.link}"
?disabled="${this.disabled || this.loading}"
role="button"
tabindex="-1"
part="paper-button"
class="${this.voteChip ? 'voteChip' : ''}"
>
${this.loading ? html`<span class="loadingSpin"></span>` : ''}
<slot></slot>
<i class="downArrow"></i>
</paper-button>`;
}
constructor() {
super();
this.initialTabindex = this.getAttribute('tabindex') || '0';
this.addEventListener('click', e => this._handleAction(e));
addShortcut(this, {key: Key.ENTER}, () => this.click());
addShortcut(this, {key: Key.SPACE}, () => this.click());
}
override updated(changedProperties: PropertyValues) {
if (changedProperties.has('disabled')) {
this.setAttribute(
'tabindex',
this.disabled ? '-1' : this.initialTabindex || '0'
);
}
if (changedProperties.has('loading') || changedProperties.has('disabled')) {
this.setAttribute(
'aria-disabled',
this.disabled || this.loading ? 'true' : 'false'
);
}
}
override connectedCallback() {
super.connectedCallback();
if (!this.getAttribute('role')) {
this.setAttribute('role', 'button');
}
if (!this.getAttribute('tabindex')) {
this.setAttribute('tabindex', '0');
}
}
_handleAction(e: MouseEvent) {
if (this.disabled || this.loading) {
e.preventDefault();
e.stopPropagation();
e.stopImmediatePropagation();
return;
}
this.reporting.reportInteraction('button-click', {path: getEventPath(e)});
}
}