polygerrit-ui/app/elements/diff/gr-range-header/gr-range-header.ts

/**
 * @license
 * Copyright (C) 2021 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 {LitElement, css, html} from 'lit';
import {customElement, property} from 'lit/decorators';
import '@polymer/iron-icon/iron-icon';

/**
 * Represents a header (label) for a code chunk whenever showing
 * diffs.
 * Used as a labeled header to describe selections in code for cases
 * like long comments and moved in/out chunks.
 */
@customElement('gr-range-header')
export class GrRangeHeader extends LitElement {
  @property({type: String})
  icon?: string;

  static override get styles() {
    return [
      css`
        .row {
          color: var(--gr-range-header-color);
          display: flex;
          font-family: var(--font-family, ''), 'Roboto Mono';
          font-size: var(--font-size-small, 12px);
          font-weight: var(--code-hint-font-weight, 500);
          line-height: var(--line-height-small, 16px);
          justify-content: flex-end;
          padding: var(--spacing-s) var(--spacing-l);
        }
        .icon {
          color: var(--gr-range-header-color);
          height: var(--line-height-small, 16px);
          width: var(--line-height-small, 16px);
          margin-right: var(--spacing-s);
        }
      `,
    ];
  }

  override render() {
    const icon = this.icon ?? '';
    return html` <div class="row">
      <iron-icon class="icon" .icon=${icon}></iron-icon>
      <slot></slot>
    </div>`;
  }
}

declare global {
  interface HTMLElementTagNameMap {
    'gr-range-header': GrRangeHeader;
  }
}