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import MessageListener from '../../MessageListener';
import Hint from './hint';
import * as dom from '../../../shared/utils/dom';
import * as messages from '../../../shared/messages';
import * as keyUtils from '../../../shared/utils/keys';
const TARGET_SELECTOR = [
'a', 'button', 'input', 'textarea', 'area',
'[contenteditable=true]', '[contenteditable=""]', '[tabindex]',
'[role="button"]', 'summary'
].join(',');
interface Size {
width: number;
height: number;
}
interface Point {
x: number;
y: number;
}
const inViewport = (
win: Window,
element: Element,
viewSize: Size,
framePosition: Point,
): boolean => {
let {
top, left, bottom, right
} = dom.viewportRect(element);
let doc = win.document;
let frameWidth = doc.documentElement.clientWidth;
let frameHeight = 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;
};
const isAriaHiddenOrAriaDisabled = (win: Window, element: Element): boolean => {
if (!element || win.document.documentElement === element) {
return false;
}
for (let attr of ['aria-hidden', 'aria-disabled']) {
let value = element.getAttribute(attr);
if (value !== null) {
let hidden = value.toLowerCase();
if (hidden === '' || hidden === 'true') {
return true;
}
}
}
return isAriaHiddenOrAriaDisabled(win, element.parentElement as Element);
};
export default class Follow {
private win: Window;
private newTab: boolean;
private background: boolean;
private hints: {[key: string]: Hint };
private targets: HTMLElement[] = [];
constructor(win: Window) {
this.win = win;
this.newTab = false;
this.background = false;
this.hints = {};
this.targets = [];
new MessageListener().onWebMessage(this.onMessage.bind(this));
}
key(key: keyUtils.Key): boolean {
if (Object.keys(this.hints).length === 0) {
return false;
}
this.win.parent.postMessage(JSON.stringify({
type: messages.FOLLOW_KEY_PRESS,
key: key.key,
ctrlKey: key.ctrlKey,
}), '*');
return true;
}
openLink(element: HTMLAreaElement|HTMLAnchorElement) {
// Browser prevent new tab by link with target='_blank'
if (!this.newTab && element.getAttribute('target') !== '_blank') {
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: true,
background: this.background,
});
}
countHints(sender: any, viewSize: Size, framePosition: Point) {
this.targets = Follow.getTargetElements(this.win, viewSize, framePosition);
sender.postMessage(JSON.stringify({
type: messages.FOLLOW_RESPONSE_COUNT_TARGETS,
count: this.targets.length,
}), '*');
}
createHints(keysArray: string[], newTab: boolean, background: boolean) {
if (keysArray.length !== this.targets.length) {
throw new Error('illegal hint count');
}
this.newTab = newTab;
this.background = background;
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: string) {
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: string) {
let hint = this.hints[keys];
if (!hint) {
return;
}
let element = hint.getTarget();
switch (element.tagName.toLowerCase()) {
case 'a':
return this.openLink(element as HTMLAnchorElement);
case 'area':
return this.openLink(element as HTMLAreaElement);
case 'input':
switch ((element as HTMLInputElement).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':
case 'summary':
return element.click();
default:
if (dom.isContentEditable(element)) {
return element.focus();
} else if (element.hasAttribute('tabindex')) {
return element.click();
}
}
}
onMessage(message: messages.Message, sender: any) {
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, message.background);
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();
}
}
static getTargetElements(
win: Window,
viewSize:
Size, framePosition: Point,
): HTMLElement[] {
let all = win.document.querySelectorAll(TARGET_SELECTOR);
let filtered = Array.prototype.filter.call(all, (element: HTMLElement) => {
let style = win.getComputedStyle(element);
// AREA's 'display' in Browser style is 'none'
return (element.tagName === 'AREA' || style.display !== 'none') &&
style.visibility !== 'hidden' &&
(element as HTMLInputElement).type !== 'hidden' &&
element.offsetHeight > 0 &&
!isAriaHiddenOrAriaDisabled(win, element) &&
inViewport(win, element, viewSize, framePosition);
});
return filtered;
}
}
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