diff --git a/packages/designer/src/component-meta.ts b/packages/designer/src/component-meta.ts
index 1954f6091..0de4a9224 100644
--- a/packages/designer/src/component-meta.ts
+++ b/packages/designer/src/component-meta.ts
@@ -7,6 +7,8 @@ import {
   TitleContent,
   TransformedComponentMetadata,
   NestingFilter,
+  isTitleConfig,
+  I18nData,
 } from '@ali/lowcode-types';
 import { computed } from '@ali/lowcode-editor-core';
 import { Node, ParentalNode } from './document';
@@ -17,6 +19,7 @@ import { IconPage } from './icons/page';
 import { IconComponent } from './icons/component';
 import { IconRemove } from './icons/remove';
 import { IconClone } from './icons/clone';
+import { ReactElement } from 'react';
 
 function ensureAList(list?: string | string[]): string[] | null {
   if (!list) {
@@ -91,12 +94,20 @@ export class ComponentMeta {
   private childWhitelist?: NestingFilter | null;
 
   private _title?: TitleContent;
-  get title() {
+  get title(): string | I18nData | ReactElement {
+    // TODO: 标记下。这块需要康师傅加一下API，页面正常渲染。
+    // string | i18nData | ReactElement
+    // TitleConfig  title.label
+    if (isTitleConfig(this._title)) {
+      return (this._title.label as any) || this.componentName;
+    }
     return this._title || this.componentName;
   }
 
   @computed get icon() {
+    // TODO: 标记下。这块需要康师傅加一下API，页面正常渲染。
     // give Slot default icon
+    // if _title is TitleConfig  get _title.icon
     return (
       this._transformedMetadata?.icon ||
       (this.componentName === 'Page' ? IconPage : this.isContainer ? IconContainer : IconComponent)
@@ -131,10 +142,10 @@ export class ComponentMeta {
       this._title =
         typeof title === 'string'
           ? {
-              type: 'i18n',
-              'en-US': this.componentName,
-              'zh-CN': title,
-            }
+            type: 'i18n',
+            'en-US': this.componentName,
+            'zh-CN': title,
+          }
           : title;
     }
 
diff --git a/packages/designer/src/designer/setting/setting-prop-entry.ts b/packages/designer/src/designer/setting/setting-prop-entry.ts
index a231eaf2b..2e11f82b5 100644
--- a/packages/designer/src/designer/setting/setting-prop-entry.ts
+++ b/packages/designer/src/designer/setting/setting-prop-entry.ts
@@ -180,6 +180,11 @@ export class SettingPropEntry implements SettingEntry {
     return this.top;
   }
 
+  // add settingfield props 
+  get props() {
+    return this.top;
+  }
+  
   onValueChange(func: () => any) {
     this.emitter.on('valuechange', func);
 
diff --git a/packages/designer/src/document/node/node.ts b/packages/designer/src/document/node/node.ts
index 4cc95b4e1..a8d469309 100644
--- a/packages/designer/src/document/node/node.ts
+++ b/packages/designer/src/document/node/node.ts
@@ -7,6 +7,7 @@ import {
   PropsList,
   NodeData,
   TitleContent,
+  I18nData,
   SlotSchema,
   PageSchema,
   ComponentSchema,
@@ -19,6 +20,7 @@ import { Prop } from './props/prop';
 import { ComponentMeta } from '../../component-meta';
 import { ExclusiveGroup, isExclusiveGroup } from './exclusive-group';
 import { TransformStage } from './transform-stage';
+import { ReactElement } from 'react';
 
 /**
  * 基础节点
@@ -122,7 +124,7 @@ export class Node<Schema extends NodeSchema = NodeSchema> {
     return 0;
   }
 
-  @computed get title(): TitleContent {
+  @computed get title(): string | I18nData | ReactElement {
     let t = this.getExtraProp('title');
     if (!t && this.componentMeta.descriptor) {
       t = this.getProp(this.componentMeta.descriptor, false);
@@ -136,6 +138,10 @@ export class Node<Schema extends NodeSchema = NodeSchema> {
     return this.componentMeta.title;
   }
 
+  get icon() {
+    return this.componentMeta.icon;
+  }
+
   constructor(readonly document: DocumentModel, nodeSchema: Schema) {
     const { componentName, id, children, props, ...extras } = nodeSchema;
     this.id = id || `node$${document.nextId()}`;
diff --git a/packages/react-simulator-renderer/src/renderer-view.tsx b/packages/react-simulator-renderer/src/renderer-view.tsx
index 227cdd6dc..9e76eee34 100644
--- a/packages/react-simulator-renderer/src/renderer-view.tsx
+++ b/packages/react-simulator-renderer/src/renderer-view.tsx
@@ -7,7 +7,7 @@ import './renderer.less';
 
 // patch cloneElement avoid lost keyProps
 const originCloneElement = window.React.cloneElement;
-(window as any).React.cloneElement = (child: any, { _leaf, ...props}: any = {}) => {
+(window as any).React.cloneElement = (child: any, { _leaf, ...props }: any = {}) => {
   if (child.ref && props.ref) {
     const dRef = props.ref;
     const cRef = child.ref;
@@ -18,7 +18,7 @@ const originCloneElement = window.React.cloneElement;
         } else {
           try {
             cRef.current = x;
-          } catch (e) { }
+          } catch (e) {}
         }
       }
       if (dRef) {
@@ -27,13 +27,13 @@ const originCloneElement = window.React.cloneElement;
         } else {
           try {
             dRef.current = x;
-          } catch (e) { }
+          } catch (e) {}
         }
       }
-    }
-  };
+    };
+  }
   return originCloneElement(child, props);
-}
+};
 
 export default class SimulatorRendererView extends Component<{ renderer: SimulatorRenderer }> {
   render() {
@@ -97,7 +97,7 @@ class Renderer extends Component<{ renderer: SimulatorRenderer }> {
           return createElement(
             Component,
             viewProps,
-            children == null ? null : Array.isArray(children) ? children : [children],
+            children == null ? [] : Array.isArray(children) ? children : [children],
           );
         }}
         onCompGetRef={(schema: any, ref: ReactInstance | null) => {
diff --git a/packages/types/src/title.ts b/packages/types/src/title.ts
index 3be21d84e..658ddf73a 100644
--- a/packages/types/src/title.ts
+++ b/packages/types/src/title.ts
@@ -13,3 +13,6 @@ export interface TitleConfig {
 
 export type TitleContent = string | I18nData | ReactElement | TitleConfig;
 
+export function isTitleConfig(obj: any): obj is TitleConfig {
+  return obj && (obj.label || obj.tip || obj.icon);
+}
diff --git a/packages/vision-preset/src/bundle/bundle.ts b/packages/vision-preset/src/bundle/bundle.ts
index 6e00f7e58..d74c3de12 100644
--- a/packages/vision-preset/src/bundle/bundle.ts
+++ b/packages/vision-preset/src/bundle/bundle.ts
@@ -100,6 +100,22 @@ export default class Bundle {
     cp.setView(view);
   }
 
+  /**
+   * TODO dirty fix
+   */
+  addComponentBundle(bundles: any) {
+    /**
+     * Normal Component bundle: [ Prototype, PrototypeView ]
+     * Component without Prototype.js: [ View ]
+     */
+    if (bundles.length >= 2) {
+      const prototype = bundles[0];
+      const prototypeView = bundles[1];
+      prototype.setView(prototypeView);
+      this.registerPrototype(prototype);
+    }
+  }
+
   private recursivelyRegisterViews(list: any[], viewName?: string): void {
     list.forEach((item: any) => {
       if (Array.isArray(item.module)) {
diff --git a/packages/vision-preset/src/components/index.less b/packages/vision-preset/src/components/index.less
new file mode 100644
index 000000000..c630e0914
--- /dev/null
+++ b/packages/vision-preset/src/components/index.less
@@ -0,0 +1,82 @@
+@import '~@ali/ve-less-variables/index.less';
+
+// 样式直接沿用之前的样式，优化了下命名
+.instance-node-selector {
+  position: relative;
+  margin-right: 2px;
+  color: var(--color-icon-white, @title-bgcolor);
+  border-radius: @global-border-radius;
+  margin-right: 2px;
+  pointer-events: auto;
+  flex-grow: 0;
+  flex-shrink: 0;
+
+  svg {
+    width: 16px;
+    height: 16px;
+    margin-right: 5px;
+    flex-grow: 0;
+    flex-shrink: 0;
+    max-width: inherit;
+    path {
+      fill: var(--color-icon-white, @title-bgcolor);
+    }
+  }
+  &-current {
+    background: var(--color-brand, @brand-color-1);
+    padding: 0 6px;
+    display: flex;
+    align-items: center;
+    height: 20px;
+    cursor: pointer;
+    color: var(--color-icon-white, @title-bgcolor);
+    border-radius: 3px;
+
+    &-title {
+      padding-right: 6px;
+      color: var(--color-icon-white, @title-bgcolor);
+    }
+  }
+  &-list {
+    position: absolute;
+    left: 0;
+    right: 0;
+    opacity: 0;
+    visibility: hidden;
+  }
+  &-node {
+    margin: 2px 0;
+    &-content {
+      padding-left: 6px;
+      background: #78869a;
+      display: inline-flex;
+      border-radius: 3px;
+      align-items: center;
+      height: 20px;
+      color: var(--color-icon-white, @title-bgcolor);
+      cursor: pointer;
+      overflow: visible;
+    }
+    &-title {
+      padding-right: 6px;
+      // margin-left: 5px;
+      color: var(--color-icon-white, @title-bgcolor);
+      cursor: pointer;
+      overflow: visible;
+    }
+    &:hover {
+      opacity: 0.8;
+    }
+  }
+}
+
+&:hover {
+  .instance-node-selector-current {
+    color: ar(--color-text-reverse, @white-alpha-2);
+  }
+  .instance-node-selector-popup {
+    visibility: visible;
+    opacity: 1;
+    transition: 0.2s all ease-in;
+  }
+}
diff --git a/packages/vision-preset/src/components/index.tsx b/packages/vision-preset/src/components/index.tsx
new file mode 100644
index 000000000..2518705aa
--- /dev/null
+++ b/packages/vision-preset/src/components/index.tsx
@@ -0,0 +1,95 @@
+import { Overlay } from '@alifd/next';
+import React from 'react';
+import './index.less';
+import { Title } from '@ali/lowcode-editor-core';
+
+import { Node, ParentalNode } from '@ali/lowcode-designer';
+
+const { Popup } = Overlay;
+
+export interface IProps {
+  node: Node;
+}
+
+export interface IState {
+  parentNodes: Node[];
+}
+
+type UnionNode = Node | ParentalNode | null;
+
+export class InstanceNodeSelector extends React.Component<IProps, IState> {
+  state: IState = {
+    parentNodes: [],
+  };
+
+  componentDidMount() {
+    const parentNodes = this.getParentNodes(this.props.node);
+    this.setState({
+      parentNodes,
+    });
+  }
+
+  // 获取节点的父级节点（最多获取5层）
+  getParentNodes = (node: Node) => {
+    const parentNodes = [];
+    let currentNode: UnionNode = node;
+
+    while (currentNode && parentNodes.length < 5) {
+      currentNode = currentNode.getParent();
+      if (currentNode) {
+        parentNodes.push(currentNode);
+      }
+    }
+    return parentNodes;
+  };
+
+  onSelect = (node: Node) => () => {
+    if (node && typeof node.select === 'function') {
+      node.select();
+    }
+  };
+
+  renderNodes = (node: Node) => {
+    const nodes = this.state.parentNodes || [];
+    const children = nodes.map((node, key) => {
+      return (
+        <div key={key} onClick={this.onSelect(node)} className="instance-node-selector-node">
+          <div className="instance-node-selector-node-content">
+            <Title
+              className="instance-node-selector-node-title"
+              title={{
+                label: node.title,
+                icon: node.icon,
+              }}
+            />
+          </div>
+        </div>
+      );
+    });
+    return children;
+  };
+
+  render() {
+    const { node } = this.props;
+    return (
+      <div className="instance-node-selector">
+        <Popup
+          trigger={
+            <div className="instance-node-selector-current">
+              <Title
+                className="instance-node-selector-node-title"
+                title={{
+                  label: node.title,
+                  icon: node.icon,
+                }}
+              />
+            </div>
+          }
+          triggerType="hover"
+        >
+          <div className="instance-node-selector">{this.renderNodes(node)}</div>
+        </Popup>
+      </div>
+    );
+  }
+}
diff --git a/packages/vision-preset/src/editor.ts b/packages/vision-preset/src/editor.ts
index 48c6e4def..5c064a3b0 100644
--- a/packages/vision-preset/src/editor.ts
+++ b/packages/vision-preset/src/editor.ts
@@ -1,15 +1,18 @@
 import { isJSBlock, isJSSlot } from '@ali/lowcode-types';
 import { isPlainObject } from '@ali/lowcode-utils';
-import { globalContext, Editor, registerSetter } from '@ali/lowcode-editor-core';
-import { Designer, TransformStage } from '@ali/lowcode-designer';
-// import { registerSetters } from '@ali/lowcode-setters';
-import Outline from '@ali/lowcode-plugin-outline-pane';
+import { globalContext, Editor } from '@ali/lowcode-editor-core';
+import { Designer, TransformStage, addBuiltinComponentAction } from '@ali/lowcode-designer';
+import { registerSetters } from '@ali/lowcode-setters';
+// import Outline from '@ali/lowcode-plugin-outline-pane';
+
 import DesignerPlugin from '@ali/lowcode-plugin-designer';
 import { Skeleton, SettingsPrimaryPane } from '@ali/lowcode-editor-skeleton';
 
 import Preview from '@ali/lowcode-plugin-sample-preview';
 // import SourceEditor from '@ali/lowcode-plugin-source-editor';
 import { i18nReducer } from './i18n-reducer';
+import { InstanceNodeSelector } from './components';
+import { Divider } from '@alifd/next';
 
 export const editor = new Editor();
 globalContext.register(editor, Editor);
@@ -78,15 +81,15 @@ skeleton.add({
   type: 'Panel',
   content: SettingsPrimaryPane,
 });
-skeleton.add({
-  area: 'leftArea',
-  name: 'outlinePane',
-  type: 'PanelDock',
-  content: Outline,
-  panelProps: {
-    area: 'leftFixedArea',
-  },
-});
+// skeleton.add({
+//   area: 'leftArea',
+//   name: 'outlinePane',
+//   type: 'PanelDock',
+//   content: Outline,
+//   panelProps: {
+//     area: 'leftFixedArea',
+//   },
+// });
 
 skeleton.add({
   area: 'topArea',
@@ -112,3 +115,10 @@ skeleton.add({
 //   },
 //   content: SourceEditor,
 // });
+
+// 实例节点选择器，线框高亮
+addBuiltinComponentAction({
+  name: 'instance-node-selector',
+  content: InstanceNodeSelector,
+  important: true,
+});
diff --git a/packages/vision-preset/src/exchange.ts b/packages/vision-preset/src/exchange.ts
index df71cff14..6e1f8c13e 100644
--- a/packages/vision-preset/src/exchange.ts
+++ b/packages/vision-preset/src/exchange.ts
@@ -12,4 +12,13 @@ export default {
     const nodes = designer.currentSelection?.getNodes();
     return nodes?.[0];
   },
+  /**
+   * TODO dirty fix
+   */
+  onIntoView(func: (node: any, insertion: any) => any) {
+    // this.emitter.on('intoview', func);
+    return () => {
+      // this.emitter.removeListener('intoview', func);
+    };
+  }
 }
diff --git a/packages/vision-preset/src/index.ts b/packages/vision-preset/src/index.ts
index 2c4db40e9..b3eaa9b01 100644
--- a/packages/vision-preset/src/index.ts
+++ b/packages/vision-preset/src/index.ts
@@ -1,11 +1,12 @@
 import * as utils from '@ali/ve-utils';
 import Popup from '@ali/ve-popups';
 import Icons from '@ali/ve-icons';
+import logger from '@ali/vu-logger';
 import { render } from 'react-dom';
 import I18nUtil from '@ali/ve-i18n-util';
 import { hotkey as Hotkey } from '@ali/lowcode-editor-core';
 import { createElement } from 'react';
-import { VE_EVENTS as EVENTS, VE_HOOKS as HOOKS } from './base/const';
+import { VE_EVENTS as EVENTS, VE_HOOKS as HOOKS, VERSION as Version } from './base/const';
 import Bus from './bus';
 import { skeleton } from './editor';
 import { Workbench } from '@ali/lowcode-editor-skeleton';
@@ -21,6 +22,8 @@ import * as Field from './fields';
 import Prop from './prop';
 import Env from './env';
 import DragEngine from './drag-engine';
+import Viewport from './viewport';
+import Project from './project';
 import { designer, editor } from './editor';
 
 import './vision.less';
@@ -101,6 +104,10 @@ const VisualEngine = {
   Bundle,
   Pages,
   DragEngine,
+  Viewport,
+  Version,
+  Project,
+  logger,
 };
 
 (window as any).VisualEngine = VisualEngine;
@@ -144,6 +151,10 @@ export {
   Bundle,
   Pages,
   DragEngine,
+  Viewport,
+  Version,
+  Project,
+  logger,
 };
 
 
diff --git a/packages/vision-preset/src/pages.ts b/packages/vision-preset/src/pages.ts
index 81430a4f1..ff17f214c 100644
--- a/packages/vision-preset/src/pages.ts
+++ b/packages/vision-preset/src/pages.ts
@@ -15,8 +15,8 @@ const pages = Object.assign(project, {
     project.load({
       version: '1.0.0',
       componentsMap: [],
-      componentsTree: pages.map(page => page.layout),
-    });
+      componentsTree: pages[0].componentsTree,
+    }, true);
   },
   addPage(data: OldPageData) {
     return project.open(data.layout);
diff --git a/packages/vision-preset/src/project.ts b/packages/vision-preset/src/project.ts
new file mode 100644
index 000000000..ba5d2309b
--- /dev/null
+++ b/packages/vision-preset/src/project.ts
@@ -0,0 +1,17 @@
+class Project {
+  private schema: any;
+
+  constructor() {
+    this.schema = {};
+  }
+
+  getSchema() {
+    return this.schema;
+  }
+
+  setSchema(schema: any) {
+    this.schema = schema;
+  }
+}
+
+export default new Project();
diff --git a/packages/vision-preset/src/viewport.ts b/packages/vision-preset/src/viewport.ts
new file mode 100644
index 000000000..0b5ec7cb7
--- /dev/null
+++ b/packages/vision-preset/src/viewport.ts
@@ -0,0 +1,278 @@
+import { EventEmitter } from 'events';
+
+const domReady = require('domready');
+import Flags from './flags';
+
+function enterFullscreen() {
+  const elem = document.documentElement;
+  if (elem.requestFullscreen) {
+    elem.requestFullscreen();
+  }
+}
+
+function exitFullscreen() {
+  if (document.exitFullscreen) {
+    document.exitFullscreen();
+  }
+}
+
+function isFullscreen() {
+  return document.fullscreen || false;
+}
+
+interface IStyleResourceConfig {
+  media?: string;
+  type?: string;
+  content?: string;
+}
+
+class StyleResource {
+  config: IStyleResourceConfig;
+  styleElement: HTMLStyleElement;
+  mounted: boolean;
+  inited: boolean;
+
+  constructor(config: IStyleResourceConfig) {
+    this.config = config || {};
+  }
+
+  matchDevice(device: string) {
+    const media = this.config.media;
+
+    if (!media || media === 'ALL' || media === '*') {
+      return true;
+    }
+
+    return media.toUpperCase() === device.toUpperCase();
+  }
+
+  init() {
+    if (this.inited) {
+      return;
+    }
+
+    this.inited = true;
+
+    const { type, content } = this.config;
+
+    let styleElement;
+    if (type === 'URL') {
+      styleElement = document.createElement('link');
+      styleElement.href = content || '';
+      styleElement.rel = 'stylesheet';
+    } else {
+      styleElement = document.createElement('style');
+      styleElement.setAttribute('type', 'text/css');
+      if (styleElement.styleSheet) {
+        styleElement.styleSheet.cssText = content;
+      } else {
+        styleElement.appendChild(document.createTextNode(content || ''));
+      }
+    }
+    this.styleElement = styleElement;
+  }
+
+  apply() {
+    if (this.mounted) {
+      return;
+    }
+
+    this.init();
+    document.head.appendChild(this.styleElement);
+    this.mounted = true;
+  }
+
+  unmount() {
+    if (!this.mounted) {
+      return;
+    }
+    document.head.removeChild(this.styleElement);
+    this.mounted = false;
+  }
+}
+
+export class Viewport {
+  preview: boolean;
+  focused: boolean;
+  slateFixed: boolean;
+  emitter: EventEmitter;
+  device: string;
+  focusTarget: any;
+  cssResourceSet: StyleResource[];
+
+  constructor() {
+    this.preview = false;
+    this.emitter = new EventEmitter();
+    document.addEventListener('webkitfullscreenchange', () => {
+      this.emitter.emit('fullscreenchange', this.isFullscreen());
+    });
+    domReady(() => this.applyMediaCSS());
+  }
+
+  setFullscreen(flag: boolean) {
+    const fullscreen = this.isFullscreen();
+    if (fullscreen && !flag) {
+      exitFullscreen();
+    } else if (!fullscreen && flag) {
+      enterFullscreen();
+    }
+  }
+
+  toggleFullscreen() {
+    if (this.isFullscreen()) {
+      exitFullscreen();
+    } else {
+      enterFullscreen();
+    }
+  }
+
+  isFullscreen() {
+    return isFullscreen();
+  }
+
+  setFocus(flag: boolean) {
+    if (this.focused && !flag) {
+      this.focused = false;
+      Flags.remove('view-focused');
+      this.emitter.emit('focuschange', false);
+    } else if (!this.focused && flag) {
+      this.focused = true;
+      Flags.add('view-focused');
+      this.emitter.emit('focuschange', true);
+    }
+  }
+
+  setFocusTarget(focusTarget: any) {
+    this.focusTarget = focusTarget;
+  }
+
+  returnFocus() {
+    if (this.focusTarget) {
+      this.focusTarget.focus();
+    }
+  }
+
+  isFocus() {
+    return this.focused;
+  }
+
+  setPreview(flag: boolean) {
+    if (this.preview && !flag) {
+      this.preview = false;
+      Flags.setPreviewMode(false);
+      this.emitter.emit('preview', false);
+      this.changeViewport();
+    } else if (!this.preview && flag) {
+      this.preview = true;
+      Flags.setPreviewMode(true);
+      this.emitter.emit('preview', true);
+      this.changeViewport();
+    }
+  }
+
+  togglePreview() {
+    if (this.isPreview()) {
+      this.setPreview(false);
+    } else {
+      this.setPreview(true);
+    }
+  }
+
+  isPreview() {
+    return this.preview;
+  }
+
+  setDevice(device = 'pc') {
+    if (this.getDevice() !== device) {
+      this.device = device;
+      Flags.setSimulator(device);
+      this.applyMediaCSS();
+      this.emitter.emit('devicechange', device);
+      this.changeViewport();
+    }
+  }
+
+  getDevice() {
+    return this.device || 'pc';
+  }
+
+  changeViewport() {
+    this.emitter.emit('viewportchange', this.getViewport());
+  }
+
+  getViewport() {
+    return `${this.isPreview() ? 'preview' : 'design'}-${this.getDevice()}`;
+  }
+
+  applyMediaCSS() {
+    if (!document.head || !this.cssResourceSet) {
+      return;
+    }
+    const device = this.getDevice();
+    this.cssResourceSet.forEach((item) => {
+      if (item.matchDevice(device)) {
+        item.apply();
+      } else {
+        item.unmount();
+      }
+    });
+  }
+
+  setGlobalCSS(resourceSet: IStyleResourceConfig[]) {
+    if (this.cssResourceSet) {
+      this.cssResourceSet.forEach((item) => {
+        item.unmount();
+      });
+    }
+    this.cssResourceSet = resourceSet.map((item: IStyleResourceConfig) => new StyleResource(item)).reverse();
+    this.applyMediaCSS();
+  }
+
+  setWithShell(shell: string) {
+    Flags.setWithShell(shell);
+  }
+
+  onFullscreenChange(func: () => any) {
+    this.emitter.on('fullscreenchange', func);
+    return () => {
+      this.emitter.removeListener('fullscreenchange', func);
+    };
+  }
+
+  onPreview(func: () => any) {
+    this.emitter.on('preview', func);
+    return () => {
+      this.emitter.removeListener('preview', func);
+    };
+  }
+
+  onDeviceChange(func: () => any) {
+    this.emitter.on('devicechange', func);
+    return () => {
+      this.emitter.removeListener('devicechange', func);
+    };
+  }
+
+  onSlateFixedChange(func: (flag: boolean) => any) {
+    this.emitter.on('slatefixed', func);
+    return () => {
+      this.emitter.removeListener('slatefixed', func);
+    };
+  }
+
+  onViewportChange(func: () => any) {
+    this.emitter.on('viewportchange', func);
+    return () => {
+      this.emitter.removeListener('viewportchange', func);
+    };
+  }
+
+  onFocusChange(func: (flag: boolean) => any) {
+    this.emitter.on('focuschange', func);
+    return () => {
+      this.emitter.removeListener('focuschange', func);
+    };
+  }
+}
+
+export default new Viewport();