react-native-devtools-frontend/front_end/panels/sources/ThreadsSidebarPane.ts

// Copyright 2014 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 threadsSidebarPaneStyles from './threadsSidebarPane.css.js';
import type * as Common from '../../core/common/common.js';
import * as i18n from '../../core/i18n/i18n.js';
import * as SDK from '../../core/sdk/sdk.js';
import * as UI from '../../ui/legacy/legacy.js';

const UIStrings = {
  /**
  *@description Text in Threads Sidebar Pane of the Sources panel
  */
  paused: 'paused',
};
const str_ = i18n.i18n.registerUIStrings('panels/sources/ThreadsSidebarPane.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
let threadsSidebarPaneInstance: ThreadsSidebarPane;

export class ThreadsSidebarPane extends UI.Widget.VBox implements
    SDK.TargetManager.SDKModelObserver<SDK.DebuggerModel.DebuggerModel>,
    UI.ListControl.ListDelegate<SDK.DebuggerModel.DebuggerModel> {
  private readonly items: UI.ListModel.ListModel<SDK.DebuggerModel.DebuggerModel>;
  private readonly list: UI.ListControl.ListControl<SDK.DebuggerModel.DebuggerModel>;
  private selectedModel: SDK.DebuggerModel.DebuggerModel|null;

  private constructor() {
    super(true);

    this.items = new UI.ListModel.ListModel();
    this.list = new UI.ListControl.ListControl(this.items, this, UI.ListControl.ListMode.NonViewport);
    const currentTarget = UI.Context.Context.instance().flavor(SDK.Target.Target);
    this.selectedModel = currentTarget !== null ? currentTarget.model(SDK.DebuggerModel.DebuggerModel) : null;
    this.contentElement.appendChild(this.list.element);

    UI.Context.Context.instance().addFlavorChangeListener(SDK.Target.Target, this.targetFlavorChanged, this);
    SDK.TargetManager.TargetManager.instance().observeModels(SDK.DebuggerModel.DebuggerModel, this);
  }

  static instance(): ThreadsSidebarPane {
    if (!threadsSidebarPaneInstance) {
      threadsSidebarPaneInstance = new ThreadsSidebarPane();
    }
    return threadsSidebarPaneInstance;
  }

  static shouldBeShown(): boolean {
    return SDK.TargetManager.TargetManager.instance().models(SDK.DebuggerModel.DebuggerModel).length >= 2;
  }

  createElementForItem(debuggerModel: SDK.DebuggerModel.DebuggerModel): Element {
    const element = document.createElement('div');
    element.classList.add('thread-item');
    const title = element.createChild('div', 'thread-item-title');
    const pausedState = element.createChild('div', 'thread-item-paused-state');
    element.appendChild(UI.Icon.Icon.create('smallicon-thick-right-arrow', 'selected-thread-icon'));
    element.tabIndex = -1;
    self.onInvokeElement(element, event => {
      UI.Context.Context.instance().setFlavor(SDK.Target.Target, debuggerModel.target());
      event.consume(true);
    });
    const isSelected = UI.Context.Context.instance().flavor(SDK.Target.Target) === debuggerModel.target();
    element.classList.toggle('selected', isSelected);
    UI.ARIAUtils.setSelected(element, isSelected);

    function updateTitle(): void {
      const executionContext = debuggerModel.runtimeModel().defaultExecutionContext();
      title.textContent =
          executionContext && executionContext.label() ? executionContext.label() : debuggerModel.target().name();
    }

    function updatePausedState(): void {
      pausedState.textContent = debuggerModel.isPaused() ? i18nString(UIStrings.paused) : '';
    }

    function targetNameChanged(event: Common.EventTarget.EventTargetEvent<SDK.Target.Target>): void {
      const target = event.data;
      if (target === debuggerModel.target()) {
        updateTitle();
      }
    }

    debuggerModel.addEventListener(SDK.DebuggerModel.Events.DebuggerPaused, updatePausedState);
    debuggerModel.addEventListener(SDK.DebuggerModel.Events.DebuggerResumed, updatePausedState);
    debuggerModel.runtimeModel().addEventListener(SDK.RuntimeModel.Events.ExecutionContextChanged, updateTitle);
    SDK.TargetManager.TargetManager.instance().addEventListener(
        SDK.TargetManager.Events.NameChanged, targetNameChanged);

    updatePausedState();
    updateTitle();
    return element;
  }

  heightForItem(_debuggerModel: SDK.DebuggerModel.DebuggerModel): number {
    console.assert(false);  // Should not be called.
    return 0;
  }

  isItemSelectable(_debuggerModel: SDK.DebuggerModel.DebuggerModel): boolean {
    return true;
  }

  selectedItemChanged(
      _from: SDK.DebuggerModel.DebuggerModel|null, _to: SDK.DebuggerModel.DebuggerModel|null, fromElement: Element|null,
      toElement: Element|null): void {
    const fromEle = (fromElement as HTMLElement | null);
    if (fromEle) {
      fromEle.tabIndex = -1;
    }
    const toEle = (toElement as HTMLElement | null);
    if (toEle) {
      this.setDefaultFocusedElement(toEle);
      toEle.tabIndex = 0;
      if (this.hasFocus()) {
        toEle.focus();
      }
    }
  }

  updateSelectedItemARIA(_fromElement: Element|null, _toElement: Element|null): boolean {
    return false;
  }

  modelAdded(debuggerModel: SDK.DebuggerModel.DebuggerModel): void {
    this.items.insert(this.items.length, debuggerModel);
    const currentTarget = UI.Context.Context.instance().flavor(SDK.Target.Target);
    if (currentTarget === debuggerModel.target()) {
      this.list.selectItem(debuggerModel);
    }
  }

  modelRemoved(debuggerModel: SDK.DebuggerModel.DebuggerModel): void {
    this.items.remove(this.items.indexOf(debuggerModel));
  }

  private targetFlavorChanged({data: target}: Common.EventTarget.EventTargetEvent<SDK.Target.Target>): void {
    const hadFocus = this.hasFocus();
    const debuggerModel = target.model(SDK.DebuggerModel.DebuggerModel);
    this.list.selectItem(debuggerModel);
    if (debuggerModel) {
      this.list.refreshItem(debuggerModel);
    }
    if (this.selectedModel !== null) {
      this.list.refreshItem(this.selectedModel);
    }
    this.selectedModel = debuggerModel;
    if (hadFocus) {
      this.focus();
    }
  }
  wasShown(): void {
    super.wasShown();
    this.registerCSSFiles([threadsSidebarPaneStyles]);
  }
}