Function setUpDisabledChangeHandler

packages/forms/src/directives/shared.ts:163–176

(control: FormControl, dir: NgControl)

 * @param dir Corresponding directive instance associated with this control.
 */
export function setUpDisabledChangeHandler(control: FormControl, dir: NgControl): void {
  if (dir.valueAccessor!.setDisabledState) {
    const onDisabledChange = (isDisabled: boolean) => {
      dir.valueAccessor!.setDisabledState!(isDisabled);
    };
    control.registerOnDisabledChange(onDisabledChange);

    // Register a callback function to cleanup disabled change handler
    // from a control instance when a directive is destroyed.
    dir._registerOnDestroy(() => {
      control._unregisterOnDisabledChange(onDisabledChange);
    });
  }
}

/**
 * Sets up sync and async directive validators on provided form control.