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import Hint, { InputHint, LinkHint } from "./Hint";
import * as doms from "../../shared/utils/dom";
const TARGET_SELECTOR = [
"a",
"button",
"input",
"textarea",
"area",
"[contenteditable=true]",
'[contenteditable=""]',
"[tabindex]",
'[role="button"]',
"[onclick]",
"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 => {
const { top, left, bottom, right } = doms.viewportRect(element);
const doc = win.document;
const frameWidth = doc.documentElement.clientWidth;
const 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 (const attr of ["aria-hidden", "aria-disabled"]) {
const value = element.getAttribute(attr);
if (value !== null) {
const hidden = value.toLowerCase();
if (hidden === "" || hidden === "true") {
return true;
}
}
}
return isAriaHiddenOrAriaDisabled(win, element.parentElement as Element);
};
export default interface FollowPresenter {
getTargetCount(viewSize: Size, framePosition: Point): number;
createHints(viewSize: Size, framePosition: Point, tags: string[]): void;
filterHints(prefix: string): void;
clearHints(): void;
getHint(tag: string): Hint | undefined;
}
export class FollowPresenterImpl implements FollowPresenter {
private hints: Hint[];
constructor() {
this.hints = [];
}
getTargetCount(viewSize: Size, framePosition: Point): number {
const targets = this.getTargets(viewSize, framePosition);
return targets.length;
}
createHints(viewSize: Size, framePosition: Point, tags: string[]): void {
const targets = this.getTargets(viewSize, framePosition);
const min = Math.min(targets.length, tags.length);
for (let i = 0; i < min; ++i) {
const target = targets[i];
if (
target instanceof HTMLAnchorElement ||
target instanceof HTMLAreaElement
) {
this.hints.push(new LinkHint(target, tags[i]));
} else {
this.hints.push(new InputHint(target, tags[i]));
}
}
}
filterHints(prefix: string): void {
const shown = this.hints.filter((h) => h.getTag().startsWith(prefix));
const hidden = this.hints.filter((h) => !h.getTag().startsWith(prefix));
shown.forEach((h) => h.show());
hidden.forEach((h) => h.hide());
}
clearHints(): void {
this.hints.forEach((h) => h.remove());
this.hints = [];
}
getHint(tag: string): Hint | undefined {
return this.hints.find((h) => h.getTag() === tag);
}
private getTargets(viewSize: Size, framePosition: Point): HTMLElement[] {
const all = window.document.querySelectorAll(TARGET_SELECTOR);
const filtered = Array.prototype.filter.call(
all,
(element: HTMLElement) => {
const style = window.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(window, element) &&
inViewport(window, element, viewSize, framePosition)
);
}
);
return filtered;
}
}
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