keybinding

// vs/workbench/services/keybinding/browser/keybindingService.ts
export class WorkbenchKeybindingService extends AbstractKeybindingService {
  constructor() {
    // 监听键盘事件
    // https://github.com/clovery/vscode/blob/main/src/vs/workbench/services/keybinding/browser/keybindingService.ts#L255
    this._register(
      dom.addDisposableListener(window, dom.EventType.KEY_DOWN, (e: KeyboardEvent) => {
        const keyEvent = new StandardKeyboardEvent(e)
        this._dispatch(keyEvent, keyEvent.target)
      })
    )
  }
}

// vs/platform/keybinding/common/abstractKeybindingService.ts
export abstract class AbstractKeybindingService extends Disposable implements IKeybindingService {
  protected _dispatch(e: IKeyboardEvent, target: IContextKeyServiceTarget): boolean {
    return this._doDispatch(this.resolveKeyboardEvent(e), target, /*isSingleModiferChord*/ false)
  }

  private _doDispatch(
    keybinding: ResolvedKeybinding,
    target: IContextKeyServiceTarget,
    isSingleModiferChord = false
  ): boolean {
    // 解析获取注册的快捷键
    const contextValue = this._contextKeyService.getContext(target)
    const keypressLabel = keybinding.getLabel()
    const resolveResult = this._getResolver().resolve(contextValue, currentChord, firstPart)

    // 执行 command
    this._commandService
      .executeCommand(resolveResult.commandId)
      .then(undefined, (err) => this._notificationService.warn(err))
  }
}

// vs/workbench/services/commands/common/commandService.ts
export class CommandService extends Disposable implements ICommandService {
  executeCommand<T>(id: string, ...args: any[]): Promise<T> {
    return this._tryExecuteCommand(id, args)
  }

  private _tryExecuteCommand(id: string, args: any[]): Promise<any> {
    // 获取命令
    const command = CommandsRegistry.getCommand(id)
    // 调用注册的 handler
    this._instantiationService.invokeFunction(command.handler, ...args)
  }
}

export const SAVE_FILE_COMMAND_ID = 'workbench.action.files.save'

KeybindingsRegistry.registerCommandAndKeybindingRule({
  when: undefined,
  weight: KeybindingWeight.WorkbenchContrib,
  primary: KeyMod.CtrlCmd | KeyCode.KEY_S,
  id: SAVE_FILE_COMMAND_ID,
  handler: (accessor) => {
    return saveSelectedEditors(accessor, {
      reason: SaveReason.EXPLICIT,
      force: true /* force save even when non-dirty */,
    })
  },
})

export const UndoCommand = registerCommand(new MultiCommand({}))