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/*
* Vencord, a modification for Discord's desktop app
* Copyright (c) 2023 Vendicated and contributors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import { FluxDispatcher, React, useRef, useState } from "@webpack/common";
import { ELEMENT_ID } from "../constants";
import { settings } from "../index";
import { waitFor } from "../utils/waitFor";
interface Vec2 {
x: number,
y: number;
}
export interface MagnifierProps {
zoom: number;
size: number,
instance: any;
}
export const Magnifier: React.FC<MagnifierProps> = ({ instance, size: initialSize, zoom: initalZoom }) => {
const [ready, setReady] = useState(false);
const [lensPosition, setLensPosition] = useState<Vec2>({ x: 0, y: 0 });
const [imagePosition, setImagePosition] = useState<Vec2>({ x: 0, y: 0 });
const [opacity, setOpacity] = useState(0);
const isShiftDown = useRef(false);
const zoom = useRef(initalZoom);
const size = useRef(initialSize);
const element = useRef<HTMLDivElement | null>(null);
const currentVideoElementRef = useRef<HTMLVideoElement | null>(null);
const originalVideoElementRef = useRef<HTMLVideoElement | null>(null);
const imageRef = useRef<HTMLImageElement | null>(null);
// since we accessing document im gonna use useLayoutEffect
React.useLayoutEffect(() => {
const onKeyDown = (e: KeyboardEvent) => {
if (e.key === "Shift") {
isShiftDown.current = true;
}
};
const onKeyUp = (e: KeyboardEvent) => {
if (e.key === "Shift") {
isShiftDown.current = false;
}
};
const syncVideos = () => {
currentVideoElementRef.current!.currentTime = originalVideoElementRef.current!.currentTime;
};
const updateMousePosition = (e: MouseEvent) => {
if (instance.state.mouseOver && instance.state.mouseDown) {
const offset = size.current / 2;
const pos = { x: e.pageX, y: e.pageY };
const x = -((pos.x - element.current!.getBoundingClientRect().left) * zoom.current - offset);
const y = -((pos.y - element.current!.getBoundingClientRect().top) * zoom.current - offset);
setLensPosition({ x: e.x - offset, y: e.y - offset });
setImagePosition({ x, y });
setOpacity(1);
} else {
setOpacity(0);
}
};
const onMouseDown = (e: MouseEvent) => {
if (instance.state.mouseOver && e.button === 0 /* left click */) {
zoom.current = settings.store.zoom;
size.current = settings.store.size;
// close context menu if open
if (document.getElementById("image-context")) {
FluxDispatcher.dispatch({ type: "CONTEXT_MENU_CLOSE" });
}
updateMousePosition(e);
setOpacity(1);
}
};
const onMouseUp = () => {
setOpacity(0);
if (settings.store.saveZoomValues) {
settings.store.zoom = zoom.current;
settings.store.size = size.current;
}
};
const onWheel = async (e: WheelEvent) => {
if (instance.state.mouseOver && instance.state.mouseDown && !isShiftDown.current) {
const val = zoom.current + ((e.deltaY / 100) * (settings.store.invertScroll ? -1 : 1)) * settings.store.zoomSpeed;
zoom.current = val <= 1 ? 1 : val;
updateMousePosition(e);
}
if (instance.state.mouseOver && instance.state.mouseDown && isShiftDown.current) {
const val = size.current + (e.deltaY * (settings.store.invertScroll ? -1 : 1)) * settings.store.zoomSpeed;
size.current = val <= 50 ? 50 : val;
updateMousePosition(e);
}
};
waitFor(() => instance.state.readyState === "READY", () => {
const elem = document.getElementById(ELEMENT_ID) as HTMLDivElement;
element.current = elem;
elem.firstElementChild!.setAttribute("draggable", "false");
if (instance.props.animated) {
originalVideoElementRef.current = elem!.querySelector("video")!;
originalVideoElementRef.current.addEventListener("timeupdate", syncVideos);
setReady(true);
} else {
setReady(true);
}
});
document.addEventListener("keydown", onKeyDown);
document.addEventListener("keyup", onKeyUp);
document.addEventListener("mousemove", updateMousePosition);
document.addEventListener("mousedown", onMouseDown);
document.addEventListener("mouseup", onMouseUp);
document.addEventListener("wheel", onWheel);
return () => {
document.removeEventListener("keydown", onKeyDown);
document.removeEventListener("keyup", onKeyUp);
document.removeEventListener("mousemove", updateMousePosition);
document.removeEventListener("mousedown", onMouseDown);
document.removeEventListener("mouseup", onMouseUp);
document.removeEventListener("wheel", onWheel);
if (settings.store.saveZoomValues) {
settings.store.zoom = zoom.current;
settings.store.size = size.current;
}
};
}, []);
if (!ready) return null;
const box = element.current!.getBoundingClientRect();
return (
<div
className="vc-imgzoom-lens"
style={{
opacity,
width: size.current + "px",
height: size.current + "px",
transform: `translate(${lensPosition.x}px, ${lensPosition.y}px)`,
}}
>
{instance.props.animated ?
(
<video
ref={currentVideoElementRef}
style={{
position: "absolute",
left: `${imagePosition.x}px`,
top: `${imagePosition.y}px`
}}
width={`${box.width * zoom.current}px`}
height={`${box.height * zoom.current}px`}
poster={instance.props.src}
src={originalVideoElementRef.current?.src ?? instance.props.src}
autoPlay
loop
/>
) : (
<img
ref={imageRef}
style={{
position: "absolute",
transform: `translate(${imagePosition.x}px, ${imagePosition.y}px)`
}}
width={`${box.width * zoom.current}px`}
height={`${box.height * zoom.current}px`}
src={instance.props.src}
alt=""
/>
)}
</div>
);
};
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