polygerrit-ui/app/elements/shared/gr-button/gr-button.html

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<link rel="import" href="../../../bower_components/polymer/polymer.html">

<link rel="import" href="../../../behaviors/gr-tooltip-behavior/gr-tooltip-behavior.html">
<link rel="import" href="../../../behaviors/keyboard-shortcut-behavior/keyboard-shortcut-behavior.html">
<link rel="import" href="../../../bower_components/paper-button/paper-button.html">
<link rel="import" href="../../../styles/shared-styles.html">

<dom-module id="gr-button">
  <template strip-whitespace>
    <style include="shared-styles">
      /* general styles for all buttons */
      :host {
        --background-color: var(--gr-button-background, #fff);
        --button-color: var(--gr-button-color, var(--color-link));
        display: inline-block;
        font-family: var(--font-family-bold);
        font-size: var(--font-size-small);
        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
        roboto-medium elsewhere. */
        -webkit-font-smoothing: initial;
        align-items: center;
        background-color: var(--background-color);
        color: var(--button-color);
        display: flex;
        font-family: inherit;
        justify-content: center;
        margin: var(--margin, 0);
        min-width: var(--border, 0);
        padding: var(--padding, 5px 10px);
        @apply --gr-button;
      }
      paper-button:hover {
        background: linear-gradient(
          rgba(0, 0, 0, .12),
          rgba(0, 0, 0, .12)
        ), var(--background-color);
      }

      /* Styles for raised buttons specifically */
      :host([primary][raised]),
      :host([secondary][raised]) {
        --background-color: var(--color-link);
        --button-color: #fff;
      }

      /* Keep below color definition for primary/secondary so that this takes
       precedence when disabled. */
      :host([disabled]) {
        --background-color: #eaeaea;
        --button-color: #a8a8a8;
        cursor: default;
      }

      /* Styles for link buttons specifically */
      :host([link]) {
        --background-color: transparent;
        --margin: 0;
        --padding: 5px 4px;
      }
      :host([disabled][link]) {
        --background-color: transparent;
      }
      :host([link][tertiary]) {
        --button-color: var(--color-link-tertiary);
      }

      /* Styles for the optional down arrow */
      :host:not([down-arrow]) .downArrow {display: none; }
      :host([down-arrow]) .downArrow {
        border-top: .36em solid #ccc;
        border-left: .36em solid transparent;
        border-right: .36em solid transparent;
        margin-bottom: .05em;
        margin-left: .5em;
        transition: border-top-color 200ms;
      }
      :host([down-arrow]) paper-button:hover .downArrow {
        border-top-color: #666;
      }
    </style>
    <paper-button
        raised="[[!link]]"
        disabled="[[_computeDisabled(disabled, loading)]]"
        tabindex="-1">
      <slot></slot>
      <i class="downArrow"></i>
    </paper-button>
  </template>
  <script src="gr-button.js"></script>
</dom-module>