Project import generated by Copybara.

GitOrigin-RevId: d9e9e3fb4e31372ec1fb43b178994ca78fa8fe70
diff --git a/static_src/elements/issue-detail/dialogs/mr-related-issues/mr-related-issues.js b/static_src/elements/issue-detail/dialogs/mr-related-issues/mr-related-issues.js
new file mode 100644
index 0000000..e859bef
--- /dev/null
+++ b/static_src/elements/issue-detail/dialogs/mr-related-issues/mr-related-issues.js
@@ -0,0 +1,316 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import {LitElement, html, css} from 'lit-element';
+
+import 'elements/chops/chops-dialog/chops-dialog.js';
+import 'elements/framework/links/mr-issue-link/mr-issue-link.js';
+import {store, connectStore} from 'reducers/base.js';
+import * as issueV0 from 'reducers/issueV0.js';
+import {SHARED_STYLES} from 'shared/shared-styles.js';
+import {ISSUE_EDIT_PERMISSION} from 'shared/consts/permissions';
+import {prpcClient} from 'prpc-client-instance.js';
+
+/**
+ * `<mr-related-issues>`
+ *
+ * Component for showing a mini list view of blocking issues to users.
+ */
+export class MrRelatedIssues extends connectStore(LitElement) {
+  /** @override */
+  static get styles() {
+    return [
+      SHARED_STYLES,
+      css`
+        :host {
+          display: block;
+          font-size: var(--chops-main-font-size);
+        }
+        table {
+          word-wrap: break-word;
+          width: 100%;
+        }
+        tr {
+          font-weight: normal;
+          text-align: left;
+          margin: 0 auto;
+          padding: 2em 1em;
+          height: 20px;
+        }
+        td {
+          background: #f8f8f8;
+          padding: 4px;
+          padding-left: 8px;
+          text-overflow: ellipsis;
+        }
+        th {
+          text-decoration: none;
+          margin-right: 0;
+          padding-right: 0;
+          padding-left: 8px;
+          white-space: nowrap;
+          background: #e3e9ff;
+          text-align: left;
+          border-right: 1px solid #fff;
+          border-top: 1px solid #fff;
+        }
+        tr.dragged td {
+          background: #eee;
+        }
+        h3.medium-heading {
+          display: flex;
+          justify-content: space-between;
+          align-items: flex-end;
+        }
+        button {
+          background: none;
+          border: none;
+          color: inherit;
+          cursor: pointer;
+          margin: 0;
+          padding: 0;
+        }
+        i.material-icons {
+          font-size: var(--chops-icon-font-size);
+          color: var(--chops-primary-icon-color);
+        }
+        .draggable {
+          cursor: grab;
+        }
+        .error {
+          max-width: 100%;
+          color: red;
+          margin-bottom: 1em;
+        }
+      `,
+    ];
+  }
+
+  /** @override */
+  render() {
+    const rerankEnabled = (this.issuePermissions ||
+      []).includes(ISSUE_EDIT_PERMISSION);
+    return html`
+      <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
+      <chops-dialog closeOnOutsideClick>
+        <h3 class="medium-heading">
+          <span>Blocked on issues</span>
+          <button aria-label="close" @click=${this.close}>
+            <i class="material-icons">close</i>
+          </button>
+        </h3>
+        ${this.error ? html`
+          <div class="error">${this.error}</div>
+        ` : ''}
+        <table><tbody>
+          <tr>
+            ${rerankEnabled ? html`<th></th>` : ''}
+            ${this.columns.map((column) => html`
+              <th>${column}</th>
+            `)}
+          </tr>
+
+          ${this._renderedRows.map((row, index) => html`
+            <tr
+              class=${index === this.srcIndex ? 'dragged' : ''}
+              draggable=${rerankEnabled && row.draggable}
+              data-index=${index}
+              @dragstart=${this._dragstart}
+              @dragend=${this._dragend}
+              @dragover=${this._dragover}
+              @drop=${this._dragdrop}
+            >
+              ${rerankEnabled ? html`
+                <td>
+                  ${rerankEnabled && row.draggable ? html`
+                    <i class="material-icons draggable">drag_indicator</i>
+                  ` : ''}
+                </td>
+              ` : ''}
+
+              ${row.cells.map((cell) => html`
+                <td>
+                  ${cell.type === 'issue' ? html`
+                    <mr-issue-link
+                      .projectName=${this.issueRef.projectName}
+                      .issue=${cell.issue}
+                    ></mr-issue-link>
+                  ` : ''}
+                  ${cell.type === 'text' ? cell.content : ''}
+                </td>
+              `)}
+            </tr>
+          `)}
+        </tbody></table>
+      </chops-dialog>
+    `;
+  }
+
+  /** @override */
+  static get properties() {
+    return {
+      columns: {type: Array},
+      error: {type: String},
+      srcIndex: {type: Number},
+      issueRef: {type: Object},
+      issuePermissions: {type: Array},
+      sortedBlockedOn: {type: Array},
+      _renderedRows: {type: Array},
+    };
+  }
+
+  /** @override */
+  stateChanged(state) {
+    this.issueRef = issueV0.viewedIssueRef(state);
+    this.issuePermissions = issueV0.permissions(state);
+    this.sortedBlockedOn = issueV0.sortedBlockedOn(state);
+  }
+
+  /** @override */
+  constructor() {
+    super();
+    this.columns = ['Issue', 'Summary'];
+  }
+
+  /** @override */
+  update(changedProperties) {
+    if (changedProperties.has('sortedBlockedOn')) {
+      this.reset();
+    }
+    super.update(changedProperties);
+  }
+
+  /** @override */
+  updated(changedProperties) {
+    if (changedProperties.has('issueRef')) {
+      this.close();
+    }
+  }
+
+  get _rows() {
+    const blockedOn = this.sortedBlockedOn;
+    if (!blockedOn) return [];
+    return blockedOn.map((issue) => {
+      const isClosed = issue.statusRef ? !issue.statusRef.meansOpen : false;
+      let summary = issue.summary;
+      if (issue.extIdentifier) {
+        // Some federated references will have summaries.
+        summary = issue.summary || '(not available)';
+      }
+      const row = {
+        // Disallow reranking FedRefs/DanglingIssueRelations.
+        draggable: !isClosed && !issue.extIdentifier,
+        cells: [
+          {
+            type: 'issue',
+            issue: issue,
+            isClosed: Boolean(isClosed),
+          },
+          {
+            type: 'text',
+            content: summary,
+          },
+        ],
+      };
+      return row;
+    });
+  }
+
+  async open() {
+    await this.updateComplete;
+    this.reset();
+    this.shadowRoot.querySelector('chops-dialog').open();
+  }
+
+  close() {
+    this.shadowRoot.querySelector('chops-dialog').close();
+  }
+
+  reset() {
+    this.error = null;
+    this.srcIndex = null;
+    this._renderedRows = this._rows.slice();
+  }
+
+  _dragstart(e) {
+    if (e.currentTarget.draggable) {
+      this.srcIndex = Number(e.currentTarget.dataset.index);
+      e.dataTransfer.setDragImage(new Image(), 0, 0);
+    }
+  }
+
+  _dragover(e) {
+    if (e.currentTarget.draggable && this.srcIndex !== null) {
+      e.preventDefault();
+      const targetIndex = Number(e.currentTarget.dataset.index);
+      this._reorderRows(this.srcIndex, targetIndex);
+      this.srcIndex = targetIndex;
+    }
+  }
+
+  _dragend(e) {
+    if (this.srcIndex !== null) {
+      this.reset();
+    }
+  }
+
+  _dragdrop(e) {
+    if (e.currentTarget.draggable && this.srcIndex !== null) {
+      const src = this._renderedRows[this.srcIndex];
+      if (this.srcIndex > 0) {
+        const target = this._renderedRows[this.srcIndex - 1];
+        const above = false;
+        this._reorderBlockedOn(src, target, above);
+      } else if (this.srcIndex === 0 &&
+                 this._renderedRows[1] && this._renderedRows[1].draggable) {
+        const target = this._renderedRows[1];
+        const above = true;
+        this._reorderBlockedOn(src, target, above);
+      }
+      this.srcIndex = null;
+    }
+  }
+
+  _reorderBlockedOn(srcArg, targetArg, above) {
+    const src = srcArg.cells[0].issue;
+    const target = targetArg.cells[0].issue;
+
+    const reorderRequest = prpcClient.call(
+        'monorail.Issues', 'RerankBlockedOnIssues', {
+          issueRef: this.issueRef,
+          movedRef: {
+            projectName: src.projectName,
+            localId: src.localId,
+          },
+          targetRef: {
+            projectName: target.projectName,
+            localId: target.localId,
+          },
+          splitAbove: above,
+        });
+
+    reorderRequest.then((response) => {
+      store.dispatch(issueV0.fetch(this.issueRef));
+    }, (error) => {
+      this.reset();
+      this.error = error.description;
+    });
+  }
+
+  _reorderRows(srcIndex, toIndex) {
+    if (srcIndex <= toIndex) {
+      this._renderedRows = this._renderedRows.slice(0, srcIndex).concat(
+          this._renderedRows.slice(srcIndex + 1, toIndex + 1),
+          [this._renderedRows[srcIndex]],
+          this._renderedRows.slice(toIndex + 1));
+    } else {
+      this._renderedRows = this._renderedRows.slice(0, toIndex).concat(
+          [this._renderedRows[srcIndex]],
+          this._renderedRows.slice(toIndex, srcIndex),
+          this._renderedRows.slice(srcIndex + 1));
+    }
+  }
+}
+
+customElements.define('mr-related-issues', MrRelatedIssues);
diff --git a/static_src/elements/issue-detail/dialogs/mr-related-issues/mr-related-issues.test.js b/static_src/elements/issue-detail/dialogs/mr-related-issues/mr-related-issues.test.js
new file mode 100644
index 0000000..69ce7ee
--- /dev/null
+++ b/static_src/elements/issue-detail/dialogs/mr-related-issues/mr-related-issues.test.js
@@ -0,0 +1,191 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import {assert} from 'chai';
+import {MrRelatedIssues} from './mr-related-issues.js';
+
+
+let element;
+
+describe('mr-related-issues', () => {
+  beforeEach(() => {
+    element = document.createElement('mr-related-issues');
+    document.body.appendChild(element);
+  });
+
+  afterEach(() => {
+    document.body.removeChild(element);
+  });
+
+  it('initializes', () => {
+    assert.instanceOf(element, MrRelatedIssues);
+  });
+
+  it('dialog closes when issueRef changes', async () => {
+    element.issueRef = {projectName: 'chromium', localId: 22};
+    await element.updateComplete;
+
+    const dialog = element.shadowRoot.querySelector('chops-dialog');
+
+    element.open();
+    await element.updateComplete;
+
+    assert.isTrue(dialog.opened);
+
+    element.issueRef = {projectName: 'chromium', localId: 23};
+    await element.updateComplete;
+
+    assert.isFalse(dialog.opened);
+  });
+
+  it('computes blocked on table rows', () => {
+    element.projectName = 'proj';
+    element.sortedBlockedOn = [
+      {projectName: 'proj', localId: 1, statusRef: {meansOpen: true},
+        summary: 'Issue 1'},
+      {projectName: 'proj', localId: 2, statusRef: {meansOpen: true},
+        summary: 'Issue 2'},
+      {projectName: 'proj', localId: 3,
+        summary: 'Issue 3'},
+      {projectName: 'proj2', localId: 4,
+        summary: 'Issue 4 on another project'},
+      {extIdentifier: 'b/123456', statusRef: {meansOpen: true}},
+      {extIdentifier: 'b/987654', statusRef: {meansOpen: false},
+        summary: 'FedRef with a summary'},
+      {projectName: 'proj', localId: 5, statusRef: {meansOpen: false},
+        summary: 'Issue 5'},
+      {projectName: 'proj2', localId: 6, statusRef: {meansOpen: false},
+        summary: 'Issue 6 on another project'},
+    ];
+    assert.deepEqual(element._rows, [
+      {
+        draggable: true,
+        cells: [
+          {
+            type: 'issue',
+            issue: {projectName: 'proj', localId: 1, statusRef: {meansOpen: true},
+              summary: 'Issue 1'},
+            isClosed: false,
+          },
+          {
+            type: 'text',
+            content: 'Issue 1',
+          },
+        ],
+      },
+      {
+        draggable: true,
+        cells: [
+          {
+            type: 'issue',
+            issue: {projectName: 'proj', localId: 2, statusRef: {meansOpen: true},
+              summary: 'Issue 2'},
+            isClosed: false,
+          },
+          {
+            type: 'text',
+            content: 'Issue 2',
+          },
+        ],
+      },
+      {
+        draggable: true,
+        cells: [
+          {
+            type: 'issue',
+            issue: {projectName: 'proj', localId: 3,
+              summary: 'Issue 3'},
+            isClosed: false,
+          },
+          {
+            type: 'text',
+            content: 'Issue 3',
+          },
+        ],
+      },
+      {
+        draggable: true,
+        cells: [
+          {
+            type: 'issue',
+            issue: {projectName: 'proj2', localId: 4,
+              summary: 'Issue 4 on another project'},
+            isClosed: false,
+          },
+          {
+            type: 'text',
+            content: 'Issue 4 on another project',
+          },
+        ],
+      },
+      {
+        draggable: false,
+        cells: [
+          {
+            type: 'issue',
+            issue: {
+              extIdentifier: 'b/123456',
+              statusRef: {meansOpen: true},
+            },
+            isClosed: false,
+          },
+          {
+            type: 'text',
+            content: '(not available)',
+          },
+        ],
+      },
+      {
+        draggable: false,
+        cells: [
+          {
+            type: 'issue',
+            issue: {
+              extIdentifier: 'b/987654',
+              statusRef: {meansOpen: false},
+              summary: 'FedRef with a summary',
+            },
+            isClosed: true,
+          },
+          {
+            type: 'text',
+            content: 'FedRef with a summary',
+          },
+        ],
+      },
+      {
+        draggable: false,
+        cells: [
+          {
+            type: 'issue',
+            issue: {projectName: 'proj', localId: 5,
+              statusRef: {meansOpen: false},
+              summary: 'Issue 5'},
+            isClosed: true,
+          },
+          {
+            type: 'text',
+            content: 'Issue 5',
+          },
+        ],
+      },
+      {
+        draggable: false,
+        cells: [
+          {
+            type: 'issue',
+            issue: {projectName: 'proj2', localId: 6,
+              statusRef: {meansOpen: false},
+              summary: 'Issue 6 on another project'},
+            isClosed: true,
+          },
+          {
+            type: 'text',
+            content: 'Issue 6 on another project',
+          },
+        ],
+      },
+    ]);
+  });
+});