vybe/client/space.js

let space;
let spaceId;

let scale = 1;

let editing;
let dragging;
let moved;
let offset;

function mousemove(event) {
	let left = (event.clientX - space.offsetLeft) * scale - offset.x;
	let top = (event.clientY - space.offsetTop) * scale - offset.y;
	dragging.style.left = `${left < 0 ? 0 : left}px`;
	dragging.style.top = `${top < 0 ? 0 : top}px`;
	moved = true;
	save(dragging);
}

let saving;
let queue;

function save(span) {
	if (saving) {
		queue = span;
		return;
	}
	saving = true;
	window.emit('save_span', {
		thread: spaceId,
		id: span.id ? span.id.slice(4) : '',
		content: span.innerText,
		x: span.style.left.slice(0, -2),
		y: span.style.top.slice(0, -2),
		scale: span.scale
	}, msg => {
		if (!msg.success)
			console.log('span save failed: ' + msg.message);
		if (!span.id)
			span.id = 'span' + msg.id;
		saving = false;
		if (queue) {
			save(queue);
			queue = null;
		}
	});
}

function add(s) {
	let span = document.createElement('span');
	span.classList.add('span');
	if (s.id)
		span.id = 'span' + s.id;
	span.innerText = s.content;
	span.contentEditable = true;
	span.spellcheck = false;
	span.scale = s.scale;
	span.style.left = `${s.x}px`;
	span.style.top = `${s.y}px`;
	span.style.transform = `translate(-50%, -50%) scale(${s.scale})`;
	span.onkeydown = function(event) {
		if (event.key === 'Enter' && !event.getModifierState('Shift')) {
			event.preventDefault();
			editing = null;
			span.blur();
		}
	};
	span.oninput = function(event) {
		save(this);
	};
	span.onblur = function(event) {
		if (this.innerText)
			return;
		save(this);
		this.remove();
	};
	span.onwheel = function(event) {
		event.preventDefault();
		if (event.deltaY < 0 && this.scale >= 200)
			return;
		this.scale *= 1 - event.deltaY * .001;
		this.style.transform = `translate(-50%, -50%) scale(${this.scale})`;
		save(this);
	};
	span.onmousedown = function(event) {
		if (dragging || editing === this)
			return;
		dragging = this;
		event.preventDefault();
		offset = {
			x: event.clientX - (space.offsetLeft + this.offsetLeft),
			y: event.clientY - (space.offsetTop + this.offsetTop)
		};
		moved = false;
		document.addEventListener('mousemove', mousemove);
	};
	span.onmouseup = function(event) {
		event.stopPropagation();
		document.removeEventListener('mousemove', mousemove);
		dragging = null;
		if (moved)
			return;
		this.focus();
		editing = this;
	};
	space.append(span);
	return span;
}

window.socket.on('span', msg => {
	if (msg.thread !== spaceId)
		return;
	let span = document.getElementById('span' + msg.id);
	if (span) {
		span.innerText = msg.content;
		span.x = msg.x;
		span.y = msg.y;
		span.scale = msg.scale;
		span.style.transform = `translate(-50%, -50%) scale(${msg.scale})`;
	}
	else
		add(msg);
});

export default function loadSpace() {
	if (!space) {
		space = document.getElementById('space');
		space.onmouseup = event => {
			if (dragging) {
				dragging.onmouseup(event);
				return;
			}
			if (editing) {
				if (event.target !== editing)
					editing = null;
				return;
			}
			editing = add({
				x: event.offsetX + space.scrollLeft,
				y: event.offsetY + space.scrollTop,
				scale: 1,
				content: ''
			});
			editing.focus();
		};
	}
	if (spaceId === window.threadId)
		return;
	spaceId = window.threadId;
	space.innerHTML = '';
	window.emit('get_space', { thread: window.threadId }, msg => {
		if (!msg.success)
			console.log('get space failed: ' + msg.message);
		for (const span of msg.spans)
			add(span);
	});
};