return SplitAlloyToolbar.getMoreButton(toolbar).bind((_moreButton) => {
   if (overflow.getSystem().isConnected()) {
     // you have the build thing, so just return it
     Positioning.position(sink, toolbarSpec.backstage.shared.anchors.toolbarOverflow(), overflow);
     return Option.some(overflow);
   } else {
     return Option.none();
   }
 });

 lastAnchor.get().each((anchor) => {
   const elem = lastElement.get().getOr(editor.selection.getNode());
   const nodeBounds = elem.getBoundingClientRect();
   const contentAreaBounds = editor.contentAreaContainer.getBoundingClientRect();
   const aboveEditor = nodeBounds.bottom < 0;
   const belowEditor = nodeBounds.top > contentAreaBounds.height;
   if (aboveEditor || belowEditor) {
     Css.set(contextbar.element(), 'display', 'none');
   } else {
     Css.remove(contextbar.element(), 'display');
     Positioning.positionWithin(sink, anchor, contextbar, getBoxElement());
   }
 });

export default () => {

  const oldSink = document.querySelectorAll('.mce-silver-sink');
  if (oldSink.length > 0) {
    throw Error('old sinks found, a previous test did not call helpers.destroy() leaving artifacts, found: ' + oldSink.length);
  }

  const sink = GuiFactory.build({
    dom: DomFactory.fromHtml('<div class="mce-silver-sink"></div>'),
    behaviours: Behaviour.derive([
      Positioning.config({
        useFixed: true
      })
    ])
  });

  const uiMothership = Gui.create();
  Class.add(uiMothership.element(), 'tox');

  const backstage = TestBackstage(sink);

  const mockEditor = {
    setContent: (content) => {},
    insertContent: (content: string, args?: any) => {},
    execCommand: (cmd: string, ui?: boolean, value?: any) => {}
  } as Editor;

  const extras = {
    editor: mockEditor,
    backstage
  };

  uiMothership.add(sink);
  Attachment.attachSystem(Body.body(), uiMothership);

  const destroy = () => {
    uiMothership.remove(sink);
    uiMothership.destroy();
  };

  return {
    backstage,
    shared: backstage.shared,
    extras,
    destroy,
    uiMothership,
    mockEditor
  };
};

const setup = (editor: Editor): RenderInfo => {
  const isInline = editor.getParam('inline', false, 'boolean');
  const mode = isInline ? Inline : Iframe;
  let lazyOuterContainer: Option<AlloyComponent> = Option.none();

  const dirAttributes = I18n.isRtl() ? {
    attributes: {
      dir: 'rtl'
    }
  } : {};

  const sink = GuiFactory.build({
    dom: {
      tag: 'div',
      classes: ['tox', 'tox-silver-sink', 'tox-tinymce-aux'],
      ...dirAttributes
    },
    behaviours: Behaviour.derive([
      Positioning.config({
        useFixed: false // this allows menus to scroll with the outer page, we don't want position: fixed
      })
    ])
  });

  const memAnchorBar = Memento.record({
    dom: {
      tag: 'div',
      classes: [ 'tox-anchorbar']
    }
  });

  const lazyAnchorBar = () => lazyOuterContainer.bind((container) => {
    return memAnchorBar.getOpt(container);
  }).getOrDie('Could not find a anchor bar element');

  const lazyMoreButton = () => lazyOuterContainer.bind((container) => {
    return OuterContainer.getMoreButton(container);
  }).getOrDie('Could not find more button element');

  const lazyToolbar = () => lazyOuterContainer.bind((container) => {
    return OuterContainer.getToolbar(container);
  }).getOrDie('Could not find more toolbar element');

  const lazyThrobber = () => lazyOuterContainer.bind((container) => {
    return OuterContainer.getThrobber(container);
  }).getOrDie('Could not find throbber element');

  const backstage: Backstage.UiFactoryBackstage = Backstage.init(sink, editor, lazyAnchorBar, lazyMoreButton);

  const lazySink = () => Result.value<AlloyComponent, Error>(sink);

  const partMenubar: AlloySpec = OuterContainer.parts().menubar({
    dom: {
      tag: 'div',
      classes: [ 'tox-menubar' ]
    },
    backstage,
    onEscape () {
      editor.focus();
    }
  });

  const partToolbar: AlloySpec = OuterContainer.parts().toolbar({
    dom: {
      tag: 'div',
      classes: [ 'tox-toolbar' ]
    },
    getSink: lazySink,
    backstage,
    onEscape() {
      editor.focus();
    },
    split: getToolbarDrawer(editor),
    lazyToolbar,
    lazyMoreButton
  });

  const partSocket: AlloySpec = OuterContainer.parts().socket({
    dom: {
      tag: 'div',
      classes: [ 'tox-edit-area' ]
    }
  });

  const partSidebar: AlloySpec = OuterContainer.parts().sidebar({
    dom: {
      tag: 'div',
      classes: ['tox-sidebar']
    }
  });

  const partThrobber: AlloySpec = OuterContainer.parts().throbber({
    dom: {
      tag: 'div',
      classes: ['tox-throbber']
    },
    backstage
  });

  const statusbar = editor.getParam('statusbar', true, 'boolean') && !isInline ? Option.some(renderStatusbar(editor, backstage.shared.providers)) : Option.none();
//.........这里部分代码省略.........