polygerrit-ui/app/elements/shared/gr-button/gr-button_html.ts

/**
 * @license
 * Copyright (C) 2020 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 {html} from '@polymer/polymer/lib/utils/html-tag';

export const htmlTemplate = html`
  <style include="shared-styles">
    /* general styles for all buttons */
    :host {
      --background-color: var(
        --button-background-color,
        var(--default-button-background-color)
      );
      --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 {
      /* The next lines contains a copy of paper-button style.
          Without a copy, the @apply works incorrectly with Polymer 2.
          @apply is deprecated and is not recommended to use. It is expected
          that @apply will be replaced with the ::part CSS pseudo-element.
          After replacement copied lines can be removed.
        */
      @apply --layout-inline;
      @apply --layout-center-center;
      position: relative;
      box-sizing: border-box;
      min-width: 5.14em;
      margin: 0 0.29em;
      background: transparent;
      -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
      -webkit-tap-highlight-color: transparent;
      font: inherit;
      text-transform: uppercase;
      outline-width: 0;
      border-radius: var(--border-radius);
      -moz-user-select: none;
      -ms-user-select: none;
      -webkit-user-select: none;
      user-select: none;
      cursor: pointer;
      z-index: 0;
      padding: var(--spacing-m);

      @apply --paper-font-common-base;
      @apply --paper-button;
      /* End of copy*/

      /* 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: inherit;
      justify-content: center;
      margin: var(--margin, 0);
      min-width: var(--border, 0);
      padding: var(--padding, 4px 8px);
      @apply --gr-button;
    }
    /* https://github.com/PolymerElements/paper-button/blob/2.x/paper-button.html */
    /* BEGIN: Copy from paper-button */
    paper-button[elevation='1'] {
      @apply --paper-material-elevation-1;
    }
    paper-button[elevation='2'] {
      @apply --paper-material-elevation-2;
    }
    paper-button[elevation='3'] {
      @apply --paper-material-elevation-3;
    }
    paper-button[elevation='4'] {
      @apply --paper-material-elevation-4;
    }
    paper-button[elevation='5'] {
      @apply --paper-material-elevation-5;
    }
    /* END: Copy from paper-button */
    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;
      --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);
    }
  </style>
  <paper-button raised="[[!link]]" disabled="[[_disabled]]" tabindex="-1">
    <template is="dom-if" if="[[loading]]">
      <span class="loadingSpin"></span>
    </template>
    <slot></slot>
    <i class="downArrow"></i>
  </paper-button>
`;