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import * as followActions from 'content/actions/follow';
import messages from 'shared/messages';
import Hint from './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 = (win, element) => {
let {
top, left, bottom, right
} = element.getBoundingClientRect();
let doc = win.doc;
return (
top >= 0 && left >= 0 &&
bottom <= (win.innerHeight || doc.documentElement.clientHeight) &&
right <= (win.innerWidth || doc.documentElement.clientWidth)
);
};
export default class FollowComponent {
constructor(win, store) {
this.win = win;
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();
});
}
openLink(element) {
if (!this.state.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.state.newTab,
});
}
activate(element) {
switch (element.tagName.toLowerCase()) {
case 'a':
return this.openLink(element, this.state.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();
}
}
create() {
let elements = FollowComponent.getTargetElements(this.win);
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(win) {
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 &&
inWindow(win, element);
});
return filtered;
}
}
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