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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;
messages.onMessage(this.onMessage.bind(this));
}
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,
});
}
}
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