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import * as followActions from '../actions/follow';
import messages from '../content/messages';
import Hint from '../content/hint';
import HintKeyProducer from '../content/hint-key-producer';
const DEFAULT_HINT_CHARSET = 'abcdefghijklmnopqrstuvwxyz';
const availableKey = (keyCode) => {
return (
KeyboardEvent.DOM_VK_0 <= keyCode && keyCode <= KeyboardEvent.DOM_VK_9 ||
KeyboardEvent.DOM_VK_A <= keyCode && keyCode <= KeyboardEvent.DOM_VK_Z
);
};
const isNumericKey = (code) => {
return KeyboardEvent.DOM_VK_0 <= code && code <= KeyboardEvent.DOM_VK_9;
};
const isAlphabeticKey = (code) => {
return KeyboardEvent.DOM_VK_A <= code && code <= KeyboardEvent.DOM_VK_Z;
};
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 = {};
let doc = wrapper.ownerDocument;
doc.addEventListener('keydown', this.onKeyDown.bind(this));
}
update() {
let prevState = this.state;
this.state = this.store.getState();
if (!prevState.enabled && this.state.enabled) {
this.create();
} else if (prevState.enabled && !this.state.enabled) {
this.remove();
} else if (JSON.stringify(prevState.keys) !==
JSON.stringify(this.state.keys)) {
this.updateHints();
}
}
onKeyDown(e) {
if (!this.state.enabled) {
return;
}
let { keyCode } = e;
switch (keyCode) {
case KeyboardEvent.DOM_VK_ENTER:
case KeyboardEvent.DOM_VK_RETURN:
this.activate(this.hintElements[
FollowComponent.codeChars(this.state.keys)].target);
return;
case KeyboardEvent.DOM_VK_ESCAPE:
this.store.dispatch(followActions.disable());
return;
case KeyboardEvent.DOM_VK_BACK_SPACE:
case KeyboardEvent.DOM_VK_DELETE:
this.store.dispatch(followActions.backspace());
break;
default:
if (availableKey(keyCode)) {
this.store.dispatch(followActions.keyPress(keyCode));
}
break;
}
e.stopPropagation();
e.preventDefault();
}
updateHints() {
let chars = FollowComponent.codeChars(this.state.keys);
let shown = Object.keys(this.hintElements).filter((key) => {
return key.startsWith(chars);
});
let hidden = Object.keys(this.hintElements).filter((key) => {
return !key.startsWith(chars);
});
if (shown.length === 0) {
this.remove();
return;
} else if (shown.length === 1) {
this.activate(this.hintElements[chars].target);
this.remove();
}
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();
}
}
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 codeChars(codes) {
const CHARCODE_ZERO = '0'.charCodeAt(0);
const CHARCODE_A = 'a'.charCodeAt(0);
let chars = '';
for (let code of codes) {
if (isNumericKey(code)) {
chars += String.fromCharCode(
code - KeyboardEvent.DOM_VK_0 + CHARCODE_ZERO);
} else if (isAlphabeticKey(code)) {
chars += String.fromCharCode(
code - KeyboardEvent.DOM_VK_A + CHARCODE_A);
}
}
return chars;
}
static getTargetElements(doc) {
let all = doc.querySelectorAll('a,button,input,textarea');
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;
}
}
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