mort
/
mediator


			
				
					
						
						
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							<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
		<title>Mediator - Remote</title>
		<link rel="stylesheet" href="style.css">
		<link rel="icon" type="image/png" href="favicon.png">

		<style>
body {
	margin: 0px;
}

#cursor {
	position: absolute;
	left: 0px;
	top: 0px;
	pointer-events: none;
}

#screencast-container {
	max-height: calc(100% - 200px);
	height: 100%;
	text-align: center;
}

#screencast-container {
	background: black;
}

#screencast {
	max-height: calc(100vh - 200px);
	max-width: 100%;
}

#input {
	padding: 12px;
	text-align: center;
}

#keyboard {
	margin-top: 12px;
}
		</style>
	</head>

	<body>
		<img id="cursor" src="cursor.png" width=10>
		<div id="screencast-container">
			<img id="screencast" src="/api/remote/screencast">
		</div>

		<div id="input">
			<form id="text-form">
				<input id="text" name="text" type="text">
			</form>

			<div id="keyboard">
				<button onclick='sendKey("escape")'>Esc</button>
				<button onclick='sendKey("enter")'>Enter</button>
				<button onclick='sendKey("space")'>Space</button>
				<button onclick='sendKey("backspace")'>Backspace</button>
			</div>
		</div>

		<script src="util.js"></script>
		<script>
let cursorEl = document.getElementById("cursor");
let screencastEl = document.getElementById("screencast");
let screencastContainerEl = document.getElementById("screencast-container");
let textFormEl = document.getElementById("text-form");
let textEl = document.getElementById("text");
let screencastSrc = screencastEl.src;
let screencastLoaded = false;

let sendMousePos = debounce(pos => {
	return api("PUT", "remote/mouse-pos", pos);
});

let sendKey = key => {
	return api("POST", "remote/keyboard-key", {key});
};

window.addEventListener("blur", () => {
	if (!screencastLoaded) {
		screencastEl.src = "";
		return;
	}

	let canvas = document.createElement("canvas");
	canvas.width = screencastEl.width;
	canvas.height = screencastEl.height;
	let ctx = canvas.getContext("2d");
	ctx.drawImage(screencastEl, 0, 0, canvas.width, canvas.height);
	screencastEl.src = canvas.toDataURL();
});

window.addEventListener("focus", () => {
	screencastLoaded = false;
	screencastEl.src = screencastSrc;
});

screencastEl.addEventListener("load", () => {
	screencastLoaded = true;
});

screencastEl.addEventListener("error", evt => {
	screencastLoaded = false;

	// This is necessary because sometimes, right after Safari on iOS returns
	// from sleep, it will fail to load the screencast.
	// This line forces the browser to reload the image.
	screencastEl.src = screencastEl.src;
});

window.addEventListener("keydown", evt => {
	if (document.activeElement.tagName == "INPUT") {
		return;
	}

	let handled = true;
	if (evt.key == " ") {
		sendKey("space");
	} else if (evt.key == "Enter") {
		sendKey("enter");
	} else if (evt.key == "ArrowUp") {
		sendKey("up");
	} else if (evt.key == "ArrowDown") {
		sendKey("down");
	} else if (evt.key == "ArrowLeft") {
		sendKey("left");
	} else if (evt.key == "ArrowRight") {
		sendKey("right");
	} else if (evt.key == "Escape") {
		sendKey("escape");
	} else if (evt.key == "Backspace") {
		sendKey("backspace");
	} else {
		handled = false;
		if (evt.key.length == 1) {
			textEl.focus();
		}
	}

	if (handled) {
		evt.preventDefault();
	}
});

function updateCursor(mousePos, screenSize) {
	let fracX = mousePos.x / screenSize.width;
	let fracY = mousePos.y / screenSize.height;
	let left = fracX * screencastEl.offsetWidth + screencastEl.offsetLeft;
	let top = fracY * screencastEl.offsetHeight + screencastEl.offsetTop;
	cursorEl.style.left = left + "px";
	cursorEl.style.top = top + "px";
}

let scrollDist = {x: 0, y: 0};
function onScroll(delta) {
	// Scroll is inverted
	delta.x = -delta.x;
	delta.y = -delta.y;

	if (Math.abs(delta.x) > Math.abs(delta.y)) {
		scrollDist.x += delta.x;
		let distX = roundToZero(scrollDist.x);
		if (distX != 0) {
			api("POST", "remote/scroll", {x: distX, y: 0});
			scrollDist.x -= distX;
		}
	} else {
		scrollDist.y += delta.y;
		let distY = roundToZero(scrollDist.y);
		if (distY != 0) {
			api("POST", "remote/scroll", {x: 0, y: distY});
			scrollDist.y -= distY;
		}
	}
}

function moveDelta(mousePos, screenSize, delta) {
	mousePos.x += delta.x;
	if (mousePos.x >= screenSize.width) {
		mousePos.x = screenSize.width - 1;
	} else if (mousePos.x < 0) {
		mousePos.x = 0;
	}

	mousePos.y += delta.y;
	if (mousePos.y >= screenSize.height) {
		mousePos.y = screenSize.height - 1;
	} else if (mousePos.y < 0) {
		mousePos.y = 0;
	}

	updateCursor(mousePos, screenSize);
	sendMousePos(mousePos);
}

function signPow(num, pow) {
	if (num >= 0) {
		return Math.pow(num, pow);
	} else {
		return -Math.pow(-num, pow);
	}
}

function roundToZero(num) {
	if (num >= 0) {
		return Math.floor(num);
	} else {
		return Math.ceil(num);
	}
}

async function main() {
	let screenSize = await api("GET", "remote/screen-size");
	let mousePos = await api("GET", "remote/mouse-pos");

	updateCursor(mousePos, screenSize);
	setInterval(async () => {
		if (!sendMousePos.waiting) {
			mousePos = await api("GET", "remote/mouse-pos");
			updateCursor(mousePos, screenSize);
		}
	}, 200);

	textFormEl.addEventListener("submit", async evt => {
		evt.preventDefault();
		let text = evt.target.elements.text.value;
		evt.target.elements.text.value = "";
		await api("POST", "remote/keyboard-type", {text});
		sendKey("enter");
	});

	screencastEl.addEventListener("click", evt => {
		evt.preventDefault();
		api("POST", "remote/mouse-click", {button: "left", doubleClick: false});
	});

	screencastEl.addEventListener("dblclick", evt => {
		evt.preventDefault();
		api("POST", "remote/mouse-click", {button: "left", doubleClick: true});
	});

	screencastEl.addEventListener("contextmenu", evt => {
		evt.preventDefault();
		api("POST", "remote/mouse-click", {button: "right", doubleClick: false});
	});

	screencastEl.addEventListener("wheel", evt => {
		evt.preventDefault();
		onScroll({x: evt.deltaX / 5, y: evt.deltaY / 5});
	});

	screencastEl.addEventListener("mousemove", evt => {
		if (evt.buttons != 0) {
			return;
		}

		evt.preventDefault();
		let fracX = evt.offsetX / evt.target.offsetWidth;
		let fracY = evt.offsetY / evt.target.offsetHeight;
		mousePos.x = Math.round(fracX * screenSize.width);
		mousePos.y = Math.round(fracY * screenSize.height);
		updateCursor(mousePos, screenSize);
		sendMousePos(mousePos);
	});

	let numTouches = 0;
	let touches = {};
	screencastContainerEl.addEventListener("touchstart", evt => {
		evt.preventDefault();
		numTouches += evt.changedTouches.length;
		for (let touch of evt.changedTouches) {
			touches[touch.identifier] = {x: touch.clientX, y: touch.clientY, moveDist: 0};
		}
	});

	screencastContainerEl.addEventListener("touchmove", evt => {
		evt.preventDefault();

		let delta = {x: 0, y: 0}
		for (let touch of evt.changedTouches) {
			let oldTouch = touches[touch.identifier];
			let d = {x: touch.clientX - oldTouch.x, y: touch.clientY - oldTouch.y};
			oldTouch.moveDist += Math.sqrt(d.x * d.x + d.y * d.y);
			oldTouch.x = touch.clientX;
			oldTouch.y = touch.clientY;
			delta.x += d.x;
			delta.y += d.y;
		}

		if (numTouches == 1) {
			delta.x = Math.round(signPow(delta.x, 1.5));
			delta.y = Math.round(signPow(delta.y, 1.5));
			moveDelta(mousePos, screenSize, delta);
		} else if (numTouches == 2) {
			delta.x = -delta.x / 5 / numTouches;
			delta.y = -delta.y / 5 / numTouches;
			onScroll(delta);
		}
	});

	screencastContainerEl.addEventListener("touchend", evt => {
		evt.preventDefault();
		numTouches -= evt.changedTouches.length;
		for (let touch of evt.changedTouches) {
			let oldTouch = touches[touch.identifier];
			touches[touch.identifier] = null;
			if (oldTouch.moveDist < 10) {
				api("POST", "remote/mouse-click", {button: "left", doubleClick: false});
				break;
			}
		}
	});
}

main();
		</script>
	</body>
</html>