const renderModalHeader = (foo: WindowHeaderFoo, providersBackstage: UiFactoryBackstageProviders): AlloySpec => {
  const pTitle = ModalDialog.parts().title(
    renderTitle(foo, Option.none(), providersBackstage)
  );

  const pHandle = ModalDialog.parts().draghandle({
    dom: DomFactory.fromHtml('<div class="tox-dialog__draghandle"></div>')
  });

  const pClose = ModalDialog.parts().close(
    renderClose(providersBackstage)
  );

  const components = [ pTitle ].concat(foo.draggable ? [ pHandle ] : []).concat([ pClose ]);
  return Container.sketch({
    dom: DomFactory.fromHtml('<div class="tox-dialog__header"></div>'),
    components
  });
};

const register = (editor: Editor, registryContextToolbars, sink, extras) => {
  const contextbar = GuiFactory.build(
    renderContextToolbar({
      sink,
      onEscape: () => {
        editor.focus();
        return Option.some(true);
      }
    })
  );

  const getBoxElement = () => Option.some(Element.fromDom(editor.contentAreaContainer));

  editor.on('init', () => {
    const scroller = editor.getBody().ownerDocument.defaultView;

    // FIX: make a lot nicer.
    const onScroll = DomEvent.bind(Element.fromDom(scroller), 'scroll', () => {
      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());
        }
      });
    });

    editor.on('remove', () => {
      onScroll.unbind();
    });
  });

  const lastAnchor = Cell(Option.none());
  const lastElement = Cell<Option<DomElement>>(Option.none<DomElement>());
  const timer = Cell(null);

  const wrapInPopDialog = (toolbarSpec: AlloySpec) => {
    return {
      dom: {
        tag: 'div',
        classes: ['tox-pop__dialog'],
      },
      components: [toolbarSpec],
      behaviours: Behaviour.derive([
        Keying.config({
          mode: 'acyclic'
        }),

        AddEventsBehaviour.config('pop-dialog-wrap-events', [
          AlloyEvents.runOnAttached((comp) => {
            editor.shortcuts.add('ctrl+F9', 'focus statusbar', () => Keying.focusIn(comp));
          }),
          AlloyEvents.runOnDetached((comp) => {
            editor.shortcuts.remove('ctrl+F9');
          })
        ])
      ])
    };
  };

  const getScopes: () => ScopedToolbars = Thunk.cached(() => {
    return ToolbarScopes.categorise(registryContextToolbars, (toolbarApi) => {
      const alloySpec = buildToolbar(toolbarApi);
      AlloyTriggers.emitWith(contextbar, forwardSlideEvent, {
        forwardContents: wrapInPopDialog(alloySpec)
      });
    });
  });

  const buildToolbar = (ctx): AlloySpec => {
    const { buttons } = editor.ui.registry.getAll();

    const scopes = getScopes();
    return ctx.type === 'contexttoolbar' ? (() => {
      const allButtons = Merger.merge(buttons, scopes.formNavigators);
      const initGroups = identifyButtons(editor, { buttons: allButtons, toolbar: ctx.items }, extras, Option.some([ 'form:' ]));
      return renderToolbar({
        uid: Id.generate('context-toolbar'),
        initGroups,
        onEscape: Option.none,
        cyclicKeying: true,
        backstage: extras.backstage,
        getSink: () => Result.error('')
      });
    })() : (() => {
      return ContextForm.renderContextForm(ctx, extras.backstage);
    })();
  };

  editor.on(showContextToolbarEvent, (e) => {
    const scopes = getScopes();
    // TODO: Have this stored in a better structure
    Objects.readOptFrom<Toolbar.ContextToolbar | Toolbar.ContextForm>(scopes.lookupTable, e.toolbarKey).each((ctx) => {
      launchContext(ctx, e.target === editor ? Option.none() : Option.some(e as DomElement));
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    ])),

    eventOrder: {
      [NativeEvents.input()]: [ 'streaming', 'urlinput-events', 'invalidating' ]
    },

    model: {
      getDisplayText: (itemData) => {
        return itemData.value;
      },
      selectsOver: false,
      populateFromBrowse: false
    },

    markers: {
      // FIX:
      openClass: 'dog'
    },

    lazySink: backstage.shared.getSink,

    parts: {
      menu: MenuParts.part(false, 1, 'normal')
    },
    onExecute: (_menu, component, _entry) => {
      AlloyTriggers.emitWith(component, formSubmitEvent, {});
    },
    onItemExecute: (typeahead, _sandbox, _item, _value) => {
      updateHistory(typeahead);
      AlloyTriggers.emitWith(typeahead, formChangeEvent, { name: spec.name });
    }
  });

  const pLabel = spec.label.map((label) => renderLabel(label, providersBackstage)) as Option<AlloySpec>;

  // TODO: Consider a way of merging with Checkbox.
  const makeIcon = (name, errId: Option<string>, icon = name, label = name) => {
    return ({
      dom: {
        tag: 'div',
        classes: ['tox-icon', 'tox-control-wrap__status-icon-' + name],
        innerHtml: Icons.get(icon, providersBackstage.icons),
        attributes: {
          'title': providersBackstage.translate(label),
          'aria-live': 'polite',
          ...errId.fold(() => ({ }), (id) => ({ id }))
        }
      }
    });
  };

  const memInvalidIcon = Memento.record(
    makeIcon('invalid', Option.some(errorId), 'warning')
  );

  const memStatus = Memento.record({
    dom: {
      tag: 'div',
      classes: ['tox-control-wrap__status-icon-wrap']
    },
    components: [
      // Include the 'valid' and 'unknown' icons here only if they are to be displayed
      memInvalidIcon.asSpec()
    ]
  });

 const launchContext = (toolbarApi: Toolbar.ContextToolbar | Toolbar.ContextForm, elem: Option<DomElement>) => {
   clearTimer();
   const toolbarSpec = buildToolbar(toolbarApi);
   const sElem = elem.map(Element.fromDom);
   const anchor = getAnchor(toolbarApi.position, sElem);
   lastAnchor.set(Option.some((anchor)));
   lastElement.set(elem);
   InlineView.showWithin(contextbar, anchor, wrapInPopDialog(toolbarSpec), getBoxElement());
   Css.remove(contextbar.element(), 'display');
 };

const toggleThrobber = (comp: AlloyComponent, state: boolean, providerBackstage: UiFactoryBackstageProviders) => {
  const element = comp.element();
  if (state === true) {
    Replacing.set(comp, [ renderSpinner(providerBackstage) ]);
    Css.remove(element, 'display');
    Attr.remove(element, 'aria-hidden');
  } else {
    Replacing.set(comp, [ ]);
    Css.set(element, 'display', 'none');
    Attr.set(element, 'aria-hidden', 'true');
  }
};

const renderModalBody = (foo: WindowBodyFoo, backstage: UiFactoryBackstage) => {
  const bodySpec = renderBody(foo, Option.none(), backstage, false);
  return ModalDialog.parts().body(
    bodySpec
  );
};