17 files changed, 451 insertions, 235 deletions

diff --git a/src/background/components/background.js b/src/background/components/background.js
index 266ad64..a5f4f5f 100644
--- a/src/background/components/background.js
+++ b/src/background/components/background.js
@@ -7,7 +7,6 @@ import * as commands from 'shared/commands';
 export default class BackgroundComponent {
   constructor(store) {
     this.store = store;
-    this.setting = {};
 
     browser.runtime.onMessage.addListener((message, sender) => {
       try {
@@ -21,11 +20,8 @@ export default class BackgroundComponent {
     });
   }
 
-  update() {
-    this.settings = this.store.getState();
-  }
-
   onMessage(message, sender) {
+    let settings = this.store.getState().setting;
     switch (message.type) {
     case messages.BACKGROUND_OPERATION:
       return this.store.dispatch(
@@ -43,16 +39,16 @@ export default class BackgroundComponent {
         type: messages.CONSOLE_HIDE_COMMAND,
       });
     case messages.CONSOLE_ENTERED:
-      return commands.exec(message.text, this.settings.value).catch((e) => {
+      return commands.exec(message.text, settings.value).catch((e) => {
         return browser.tabs.sendMessage(sender.tab.id, {
           type: messages.CONSOLE_SHOW_ERROR,
           text: e.message,
         });
       });
     case messages.SETTINGS_QUERY:
-      return Promise.resolve(this.store.getState().value);
+      return Promise.resolve(this.store.getState().setting.value);
     case messages.CONSOLE_QUERY_COMPLETIONS:
-      return commands.complete(message.text, this.settings.value);
+      return commands.complete(message.text, settings.value);
     case messages.SETTINGS_RELOAD:
       this.store.dispatch(settingsActions.load());
       return this.broadcastSettingsChanged();
diff --git a/src/background/index.js b/src/background/index.js
index 6ba37eb..8a68767 100644
--- a/src/background/index.js
+++ b/src/background/index.js
@@ -1,7 +1,7 @@
 import * as settingsActions from 'settings/actions/setting';
 import messages from 'shared/messages';
 import BackgroundComponent from 'background/components/background';
-import reducers from 'settings/reducers/setting';
+import reducers from 'background/reducers';
 import { createStore } from 'shared/store';
 
 const store = createStore(reducers, (e, sender) => {
@@ -13,9 +13,7 @@ const store = createStore(reducers, (e, sender) => {
     });
   }
 });
+// eslint-disable-next-line no-unused-vars
 const backgroundComponent = new BackgroundComponent(store);
-store.subscribe((sender) => {
-  backgroundComponent.update(sender);
-});
 
 store.dispatch(settingsActions.load());
diff --git a/src/background/reducers/index.js b/src/background/reducers/index.js
new file mode 100644
index 0000000..4be8fac
--- /dev/null
+++ b/src/background/reducers/index.js
@@ -0,0 +1,12 @@
+import settingReducer from 'settings/reducers/setting';
+
+// Make setting reducer instead of re-use
+const defaultState = {
+  setting: settingReducer(undefined, {}),
+};
+
+export default function reducer(state = defaultState, action = {}) {
+  return Object.assign({}, state, {
+    setting: settingReducer(state.setting, action),
+  });
+}
diff --git a/src/console/index.js b/src/console/index.js
index 895fcc2..2ae5779 100644
--- a/src/console/index.js
+++ b/src/console/index.js
@@ -36,6 +36,6 @@ store.subscribe(() => {
 });
 
 browser.runtime.onMessage.addListener(onMessage);
-window.addEventListener('message', (message) => {
-  onMessage(JSON.parse(message.data));
+window.addEventListener('message', (event) => {
+  onMessage(JSON.parse(event.data));
 }, false);
diff --git a/src/content/actions/operation.js b/src/content/actions/operation.js
index 3aa9c1f..81bcc2f 100644
--- a/src/content/actions/operation.js
+++ b/src/content/actions/operation.js
@@ -3,7 +3,6 @@ import messages from 'shared/messages';
 import * as scrolls from 'content/scrolls';
 import * as navigates from 'content/navigates';
 import * as urls from 'content/urls';
-import * as followActions from 'content/actions/follow';
 import * as consoleFrames from 'content/console-frames';
 
 const exec = (operation) => {
@@ -23,7 +22,10 @@ const exec = (operation) => {
   case operations.SCROLL_END:
     return scrolls.scrollEnd(window);
   case operations.FOLLOW_START:
-    return followActions.enable(operation.newTab);
+    return window.top.postMessage(JSON.stringify({
+      type: messages.FOLLOW_START,
+      newTab: operation.newTab
+    }), '*');
   case operations.NAVIGATE_HISTORY_PREV:
     return navigates.historyPrev(window);
   case operations.NAVIGATE_HISTORY_NEXT:
diff --git a/src/content/components/common/follow.js b/src/content/components/common/follow.js
new file mode 100644
index 0000000..92d8822
--- /dev/null
+++ b/src/content/components/common/follow.js
@@ -0,0 +1,169 @@
+import messages from 'shared/messages';
+import Hint from './hint';
+
+const TARGET_SELECTOR = [
+  'a', 'button', 'input', 'textarea',
+  '[contenteditable=true]', '[contenteditable=""]'
+].join(',');
+
+const inViewport = (win, element, viewSize, framePosition) => {
+  let {
+    top, left, bottom, right
+  } = element.getBoundingClientRect();
+  let doc = win.doc;
+  let frameWidth = win.innerWidth || doc.documentElement.clientWidth;
+  let frameHeight = win.innerHeight || doc.documentElement.clientHeight;
+
+  if (right < 0 || bottom < 0 || top > frameHeight || left > frameWidth) {
+    // out of frame
+    return false;
+  }
+  if (right + framePosition.x < 0 || bottom + framePosition.y < 0 ||
+      left + framePosition.x > viewSize.width ||
+      top + framePosition.y > viewSize.height) {
+    // out of viewport
+    return false;
+  }
+  return true;
+};
+
+export default class Follow {
+  constructor(win, store) {
+    this.win = win;
+    this.store = store;
+    this.newTab = false;
+    this.hints = {};
+    this.targets = [];
+  }
+
+  update() {
+  }
+
+  key(key) {
+    if (Object.keys(this.hints).length === 0) {
+      return false;
+    }
+    this.win.parent.postMessage(JSON.stringify({
+      type: messages.FOLLOW_KEY_PRESS,
+      key,
+    }), '*');
+    return true;
+  }
+
+  openLink(element) {
+    if (!this.newTab) {
+      element.click();
+      return;
+    }
+
+    let href = element.getAttribute('href');
+
+    // eslint-disable-next-line no-script-url
+    if (!href || href === '#' || href.toLowerCase().startsWith('javascript:')) {
+      return;
+    }
+    return browser.runtime.sendMessage({
+      type: messages.OPEN_URL,
+      url: element.href,
+      newTab: this.newTab,
+    });
+  }
+
+  countHints(sender, viewSize, framePosition) {
+    this.targets = Follow.getTargetElements(this.win, viewSize, framePosition);
+    sender.postMessage(JSON.stringify({
+      type: messages.FOLLOW_RESPONSE_COUNT_TARGETS,
+      count: this.targets.length,
+    }), '*');
+  }
+
+  createHints(keysArray, newTab) {
+    if (keysArray.length !== this.targets.length) {
+      throw new Error('illegal hint count');
+    }
+
+    this.newTab = newTab;
+    this.hints = {};
+    for (let i = 0; i < keysArray.length; ++i) {
+      let keys = keysArray[i];
+      let hint = new Hint(this.targets[i], keys);
+      this.hints[keys] = hint;
+    }
+  }
+
+  showHints(keys) {
+    Object.keys(this.hints).filter(key => key.startsWith(keys))
+      .forEach(key => this.hints[key].show());
+    Object.keys(this.hints).filter(key => !key.startsWith(keys))
+      .forEach(key => this.hints[key].hide());
+  }
+
+  removeHints() {
+    Object.keys(this.hints).forEach((key) => {
+      this.hints[key].remove();
+    });
+    this.hints = {};
+    this.targets = [];
+  }
+
+  activateHints(keys) {
+    let hint = this.hints[keys];
+    if (!hint) {
+      return;
+    }
+    let element = hint.target;
+    switch (element.tagName.toLowerCase()) {
+    case 'a':
+      return this.openLink(element, this.newTab);
+    case 'input':
+      switch (element.type) {
+      case 'file':
+      case 'checkbox':
+      case 'radio':
+      case 'submit':
+      case 'reset':
+      case 'button':
+      case 'image':
+      case 'color':
+        return element.click();
+      default:
+        return element.focus();
+      }
+    case 'textarea':
+      return element.focus();
+    case 'button':
+      return element.click();
+    default:
+      // it may contenteditable
+      return element.focus();
+    }
+  }
+
+  onMessage(message, sender) {
+    switch (message.type) {
+    case messages.FOLLOW_REQUEST_COUNT_TARGETS:
+      return this.countHints(sender, message.viewSize, message.framePosition);
+    case messages.FOLLOW_CREATE_HINTS:
+      return this.createHints(message.keysArray, message.newTab);
+    case messages.FOLLOW_SHOW_HINTS:
+      return this.showHints(message.keys);
+    case messages.FOLLOW_ACTIVATE:
+      return this.activateHints(message.keys);
+    case messages.FOLLOW_REMOVE_HINTS:
+      return this.removeHints(message.keys);
+    }
+  }
+
+  static getTargetElements(win, viewSize, framePosition) {
+    let all = win.document.querySelectorAll(TARGET_SELECTOR);
+    let filtered = Array.prototype.filter.call(all, (element) => {
+      let style = win.getComputedStyle(element);
+      return style.display !== 'none' &&
+        style.visibility !== 'hidden' &&
+        element.type !== 'hidden' &&
+        element.offsetHeight > 0 &&
+        inViewport(win, element, viewSize, framePosition);
+    });
+    return filtered;
+  }
+}
diff --git a/src/content/hint.css b/src/content/components/common/hint.css
index 119dd21..119dd21 100644
--- a/src/content/hint.css
+++ b/src/content/components/common/hint.css
diff --git a/src/content/hint.js b/src/content/components/common/hint.js
index cc46fd6..cc46fd6 100644
--- a/src/content/hint.js
+++ b/src/content/components/common/hint.js
diff --git a/src/content/components/common/index.js b/src/content/components/common/index.js
new file mode 100644
index 0000000..a05febd
--- /dev/null
+++ b/src/content/components/common/index.js
@@ -0,0 +1,45 @@
+import InputComponent from './input';
+import KeymapperComponent from './keymapper';
+import FollowComponent from './follow';
+import * as inputActions from 'content/actions/input';
+import messages from 'shared/messages';
+
+export default class Common {
+  constructor(win, store) {
+    const follow = new FollowComponent(win, store);
+    const input = new InputComponent(win.document.body, store);
+    const keymapper = new KeymapperComponent(store);
+
+    input.onKey((key, ctrl) => follow.key(key, ctrl));
+    input.onKey((key, ctrl) => keymapper.key(key, ctrl));
+
+    this.store = store;
+    this.children = [
+      follow,
+      input,
+      keymapper,
+    ];
+
+    this.reloadSettings();
+  }
+
+  update() {
+    this.children.forEach(c => c.update());
+  }
+
+  onMessage(message, sender) {
+    switch (message) {
+    case messages.SETTINGS_CHANGED:
+      this.reloadSettings();
+    }
+    this.children.forEach(c => c.onMessage(message, sender));
+  }
+
+  reloadSettings() {
+    browser.runtime.sendMessage({
+      type: messages.SETTINGS_QUERY,
+    }).then((settings) => {
+      this.store.dispatch(inputActions.setKeymaps(settings.keymaps));
+    });
+  }
+}
diff --git a/src/content/components/content-input.js b/src/content/components/common/input.js
index 3e70bbb..8a7f82a 100644
--- a/src/content/components/content-input.js
+++ b/src/content/components/common/input.js
@@ -1,4 +1,4 @@
-export default class ContentInputComponent {
+export default class InputComponent {
   constructor(target) {
     this.pressed = {};
     this.onKeyListeners = [];
@@ -69,4 +69,7 @@ export default class ContentInputComponent {
           e.target.getAttribute('contenteditable').toLowerCase() === 'true' ||
           e.target.getAttribute('contenteditable').toLowerCase() === '');
   }
+
+  onMessage() {
+  }
 }
diff --git a/src/content/components/keymapper.js b/src/content/components/common/keymapper.js
index 655c3f2..2a57b28 100644
--- a/src/content/components/keymapper.js
+++ b/src/content/components/common/keymapper.js
@@ -28,4 +28,7 @@ export default class KeymapperComponent {
     this.store.dispatch(inputActions.clearKeys());
     return true;
   }
+
+  onMessage() {
+  }
 }
diff --git a/src/content/components/follow.js b/src/content/components/follow.js
deleted file mode 100644
index eb453a5..0000000
--- a/src/content/components/follow.js
+++ /dev/null
@@ -1,175 +0,0 @@
-import * as followActions from 'content/actions/follow';
-import messages from 'shared/messages';
-import Hint from 'content/hint';
-import HintKeyProducer from 'content/hint-key-producer';
-
-const DEFAULT_HINT_CHARSET = 'abcdefghijklmnopqrstuvwxyz';
-const TARGET_SELECTOR = [
-  'a', 'button', 'input', 'textarea',
-  '[contenteditable=true]', '[contenteditable=""]'
-].join(',');
-
-const inWindow = (window, element) => {
-  let {
-    top, left, bottom, right
-  } = element.getBoundingClientRect();
-  return (
-    top >= 0 && left >= 0 &&
-    bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
-    right <= (window.innerWidth || document.documentElement.clientWidth)
-  );
-};
-
-export default class FollowComponent {
-  constructor(wrapper, store) {
-    this.wrapper = wrapper;
-    this.store = store;
-    this.hintElements = {};
-    this.state = {};
-  }
-
-  update() {
-    let prevState = this.state;
-    this.state = this.store.getState().follow;
-    if (!prevState.enabled && this.state.enabled) {
-      this.create();
-    } else if (prevState.enabled && !this.state.enabled) {
-      this.remove();
-    } else if (prevState.keys !== this.state.keys) {
-      this.updateHints();
-    }
-  }
-
-  key(key) {
-    if (!this.state.enabled) {
-      return false;
-    }
-
-    switch (key) {
-    case 'Enter':
-      this.activate(this.hintElements[this.state.keys].target);
-      return;
-    case 'Escape':
-      this.store.dispatch(followActions.disable());
-      return;
-    case 'Backspace':
-    case 'Delete':
-      this.store.dispatch(followActions.backspace());
-      break;
-    default:
-      if (DEFAULT_HINT_CHARSET.includes(key)) {
-        this.store.dispatch(followActions.keyPress(key));
-      }
-      break;
-    }
-    return true;
-  }
-
-  updateHints() {
-    let keys = this.state.keys;
-    let shown = Object.keys(this.hintElements).filter((key) => {
-      return key.startsWith(keys);
-    });
-    let hidden = Object.keys(this.hintElements).filter((key) => {
-      return !key.startsWith(keys);
-    });
-    if (shown.length === 0) {
-      this.remove();
-      return;
-    } else if (shown.length === 1) {
-      this.activate(this.hintElements[keys].target);
-      this.store.dispatch(followActions.disable());
-    }
-
-    shown.forEach((key) => {
-      this.hintElements[key].show();
-    });
-    hidden.forEach((key) => {
-      this.hintElements[key].hide();
-    });
-  }
-
-  activate(element) {
-    switch (element.tagName.toLowerCase()) {
-    case 'a':
-      if (this.state.newTab) {
-        // getAttribute() to avoid to resolve absolute path
-        let href = element.getAttribute('href');
-
-        // eslint-disable-next-line no-script-url
-        if (!href || href === '#' || href.startsWith('javascript:')) {
-          return;
-        }
-        return browser.runtime.sendMessage({
-          type: messages.OPEN_URL,
-          url: element.href,
-          newTab: this.state.newTab,
-        });
-      }
-      if (element.href.startsWith('http://') ||
-        element.href.startsWith('https://') ||
-        element.href.startsWith('ftp://')) {
-        return browser.runtime.sendMessage({
-          type: messages.OPEN_URL,
-          url: element.href,
-          newTab: this.state.newTab,
-        });
-      }
-      return element.click();
-    case 'input':
-      switch (element.type) {
-      case 'file':
-      case 'checkbox':
-      case 'radio':
-      case 'submit':
-      case 'reset':
-      case 'button':
-      case 'image':
-      case 'color':
-        return element.click();
-      default:
-        return element.focus();
-      }
-    case 'textarea':
-      return element.focus();
-    case 'button':
-      return element.click();
-    default:
-      // it may contenteditable
-      return element.focus();
-    }
-  }
-
-  create() {
-    let doc = this.wrapper.ownerDocument;
-    let elements = FollowComponent.getTargetElements(doc);
-    let producer = new HintKeyProducer(DEFAULT_HINT_CHARSET);
-    let hintElements = {};
-    Array.prototype.forEach.call(elements, (ele) => {
-      let keys = producer.produce();
-      let hint = new Hint(ele, keys);
-      hintElements[keys] = hint;
-    });
-    this.hintElements = hintElements;
-  }
-
-  remove() {
-    let hintElements = this.hintElements;
-    Object.keys(this.hintElements).forEach((key) => {
-      hintElements[key].remove();
-    });
-  }
-
-  static getTargetElements(doc) {
-    let all = doc.querySelectorAll(TARGET_SELECTOR);
-    let filtered = Array.prototype.filter.call(all, (element) => {
-      let style = window.getComputedStyle(element);
-      return style.display !== 'none' &&
-        style.visibility !== 'hidden' &&
-        element.type !== 'hidden' &&
-        element.offsetHeight > 0 &&
-        inWindow(window, element);
-    });
-    return filtered;
-  }
-}
diff --git a/src/content/components/frame-content.js b/src/content/components/frame-content.js
new file mode 100644
index 0000000..46786d2
--- /dev/null
+++ b/src/content/components/frame-content.js
@@ -0,0 +1,16 @@
+import CommonComponent from './common';
+
+export default class FrameContent {
+
+  constructor(win, store) {
+    this.children = [new CommonComponent(win, store)];
+  }
+
+  update() {
+    this.children.forEach(c => c.update());
+  }
+
+  onMessage(message, sender) {
+    this.children.forEach(c => c.onMessage(message, sender));
+  }
+}
diff --git a/src/content/components/top-content/follow-controller.js b/src/content/components/top-content/follow-controller.js
new file mode 100644
index 0000000..29f40b3
--- /dev/null
+++ b/src/content/components/top-content/follow-controller.js
@@ -0,0 +1,131 @@
+import * as followActions from 'content/actions/follow';
+import messages from 'shared/messages';
+import HintKeyProducer from 'content/hint-key-producer';
+
+const DEFAULT_HINT_CHARSET = 'abcdefghijklmnopqrstuvwxyz';
+
+const broadcastMessage = (win, message) => {
+  let json = JSON.stringify(message);
+  let frames = [window.self].concat(Array.from(window.frames));
+  frames.forEach(frame => frame.postMessage(json, '*'));
+};
+
+export default class FollowController {
+  constructor(win, store) {
+    this.win = win;
+    this.store = store;
+    this.state = {};
+    this.keys = [];
+    this.producer = null;
+  }
+
+  onMessage(message, sender) {
+    switch (message.type) {
+    case messages.FOLLOW_START:
+      return this.store.dispatch(followActions.enable(message.newTab));
+    case messages.FOLLOW_RESPONSE_COUNT_TARGETS:
+      return this.create(message.count, sender);
+    case messages.FOLLOW_KEY_PRESS:
+      return this.keyPress(message.key);
+    }
+  }
+
+  update() {
+    let prevState = this.state;
+    this.state = this.store.getState().follow;
+
+    if (!prevState.enabled && this.state.enabled) {
+      this.count();
+    } else if (prevState.enabled && !this.state.enabled) {
+      this.remove();
+    } else if (prevState.keys !== this.state.keys) {
+      this.updateHints();
+    }
+  }
+
+  updateHints() {
+    let shown = this.keys.filter(key => key.startsWith(this.state.keys));
+    if (shown.length === 1) {
+      this.activate();
+      this.store.dispatch(followActions.disable());
+    }
+
+    broadcastMessage(this.win, {
+      type: messages.FOLLOW_SHOW_HINTS,
+      keys: this.state.keys,
+    });
+  }
+
+  activate() {
+    broadcastMessage(this.win, {
+      type: messages.FOLLOW_ACTIVATE,
+      keys: this.state.keys,
+    });
+  }
+
+  keyPress(key) {
+    switch (key) {
+    case 'Enter':
+      this.activate();
+      this.store.dispatch(followActions.disable());
+      break;
+    case 'Escape':
+      this.store.dispatch(followActions.disable());
+      break;
+    case 'Backspace':
+    case 'Delete':
+      this.store.dispatch(followActions.backspace());
+      break;
+    default:
+      if (DEFAULT_HINT_CHARSET.includes(key)) {
+        this.store.dispatch(followActions.keyPress(key));
+      }
+      break;
+    }
+    return true;
+  }
+
+  count() {
+    this.producer = new HintKeyProducer(DEFAULT_HINT_CHARSET);
+    let doc = this.win.document;
+    let viewWidth = this.win.innerWidth || doc.documentElement.clientWidth;
+    let viewHeight = this.win.innerHeight || doc.documentElement.clientHeight;
+    let frameElements = this.win.document.querySelectorAll('frame,iframe');
+
+    this.win.postMessage(JSON.stringify({
+      type: messages.FOLLOW_REQUEST_COUNT_TARGETS,
+      viewSize: { width: viewWidth, height: viewHeight },
+      framePosition: { x: 0, y: 0 },
+    }), '*');
+    frameElements.forEach((element) => {
+      let { left: frameX, top: frameY } = element.getBoundingClientRect();
+      let message = JSON.stringify({
+        type: messages.FOLLOW_REQUEST_COUNT_TARGETS,
+        viewSize: { width: viewWidth, height: viewHeight },
+        framePosition: { x: frameX, y: frameY },
+      });
+      element.contentWindow.postMessage(message, '*');
+    });
+  }
+
+  create(count, sender) {
+    let produced = [];
+    for (let i = 0; i < count; ++i) {
+      produced.push(this.producer.produce());
+    }
+    this.keys = this.keys.concat(produced);
+
+    sender.postMessage(JSON.stringify({
+      type: messages.FOLLOW_CREATE_HINTS,
+      keysArray: produced,
+      newTab: this.state.newTab,
+    }), '*');
+  }
+
+  remove() {
+    this.keys = [];
+    broadcastMessage(this.win, {
+      type: messages.FOLLOW_REMOVE_HINTS,
+    });
+  }
+}
diff --git a/src/content/components/top-content/index.js b/src/content/components/top-content/index.js
new file mode 100644
index 0000000..a2179da
--- /dev/null
+++ b/src/content/components/top-content/index.js
@@ -0,0 +1,32 @@
+import CommonComponent from '../common';
+import FollowController from './follow-controller';
+import * as consoleFrames from '../../console-frames';
+import messages from 'shared/messages';
+
+export default class TopContent {
+
+  constructor(win, store) {
+    this.win = win;
+    this.children = [
+      new CommonComponent(win, store),
+      new FollowController(win, store),
+    ];
+
+    // TODO make component
+    consoleFrames.initialize(window.document);
+  }
+
+  update() {
+    this.children.forEach(c => c.update());
+  }
+
+  onMessage(message, sender) {
+    switch (message.type) {
+    case messages.CONSOLE_HIDE_COMMAND:
+      this.win.focus();
+      consoleFrames.blur(window.document);
+      return Promise.resolve();
+    }
+    this.children.forEach(c => c.onMessage(message, sender));
+  }
+}
diff --git a/src/content/index.js b/src/content/index.js
index 64d86bb..e01172d 100644
--- a/src/content/index.js
+++ b/src/content/index.js
@@ -1,54 +1,29 @@
 import './console-frame.scss';
-import * as consoleFrames from './console-frames';
-import * as inputActions from './actions/input';
 import { createStore } from 'shared/store';
-import ContentInputComponent from 'content/components/content-input';
-import KeymapperComponent from 'content/components/keymapper';
-import FollowComponent from 'content/components/follow';
 import reducers from 'content/reducers';
-import messages from 'shared/messages';
+import TopContentComponent from './components/top-content';
+import FrameContentComponent from './components/frame-content';
 
 const store = createStore(reducers);
-const followComponent = new FollowComponent(window.document.body, store);
-const contentInputComponent =
-  new ContentInputComponent(window.document.body, store);
-const keymapperComponent = new KeymapperComponent(store);
-contentInputComponent.onKey((key, ctrl) => {
-  return followComponent.key(key, ctrl);
-});
-contentInputComponent.onKey((key, ctrl) => {
-  return keymapperComponent.key(key, ctrl);
-});
+
+let rootComponent = window.self === window.top
+  ? new TopContentComponent(window, store)
+  : new FrameContentComponent(window, store);
+
 store.subscribe(() => {
-  try {
-    followComponent.update();
-    contentInputComponent.update();
-  } catch (e) {
-    console.error(e);
-  }
+  rootComponent.update();
 });
 
-consoleFrames.initialize(window.document);
-
-const reloadSettings = () => {
-  return browser.runtime.sendMessage({
-    type: messages.SETTINGS_QUERY,
-  }).then((settings) => {
-    store.dispatch(inputActions.setKeymaps(settings.keymaps));
-  });
-};
+browser.runtime.onMessage.addListener(msg => rootComponent.onMessage(msg));
+rootComponent.update();
 
-browser.runtime.onMessage.addListener((action) => {
-  switch (action.type) {
-  case messages.CONSOLE_HIDE_COMMAND:
-    window.focus();
-    consoleFrames.blur(window.document);
-    return Promise.resolve();
-  case messages.SETTINGS_CHANGED:
-    return reloadSettings();
-  default:
-    return Promise.resolve();
+window.addEventListener('message', (event) => {
+  let message = null;
+  try {
+    message = JSON.parse(event.data);
+  } catch (e) {
+    // ignore unexpected message
+    return;
   }
+  rootComponent.onMessage(message, event.source);
 });
-
-reloadSettings();
diff --git a/src/shared/messages.js b/src/shared/messages.js
index 2467a67..581e167 100644
--- a/src/shared/messages.js
+++ b/src/shared/messages.js
@@ -11,6 +11,15 @@ export default {
   CONSOLE_SHOW_INFO: 'console.show.info',
   CONSOLE_HIDE_COMMAND: 'console.hide.command',
 
+  FOLLOW_START: 'follow.start',
+  FOLLOW_REQUEST_COUNT_TARGETS: 'follow.request.count.targets',
+  FOLLOW_RESPONSE_COUNT_TARGETS: 'follow.response.count.targets',
+  FOLLOW_CREATE_HINTS: 'follow.create.hints',
+  FOLLOW_SHOW_HINTS: 'follow.update.hints',
+  FOLLOW_REMOVE_HINTS: 'follow.remove.hints',
+  FOLLOW_ACTIVATE: 'follow.activate',
+  FOLLOW_KEY_PRESS: 'follow.key.press',
+
   OPEN_URL: 'open.url',
 
   SETTINGS_RELOAD: 'settings.reload',