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const inputConfig = {
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clickRadius: 10, // Radius to be considered a click (pixels). If farther, turns into a drag
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clickTiming: 500, // Timing window to be considered a click (ms). If longer, turns into a drag
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dClickTiming: 500, // Timing window to be considered a double click (ms).
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};
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/**
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* Mouse input processing
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*/
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// Base object generator functions
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function _context_coords() {
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return {
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dragging: {
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left: null,
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middle: null,
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right: null,
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},
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prev: {
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x: 0,
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y: 0,
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},
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pos: {
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x: 0,
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y: 0,
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},
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};
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}
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function _mouse_observers() {
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return {
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// Simple click handlers
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onclick: new Observer(),
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// Double click handlers (will still trigger simple click handler as well)
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ondclick: new Observer(),
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// Drag handler
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ondragstart: new Observer(),
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ondrag: new Observer(),
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ondragend: new Observer(),
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// Paint handler (like drag handler, but with no delay); will trigger during clicks too
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onpaintstart: new Observer(),
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onpaint: new Observer(),
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onpaintend: new Observer(),
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};
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}
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function _context_observers() {
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return {
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onmousemove: new Observer(),
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left: _mouse_observers(),
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middle: _mouse_observers(),
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right: _mouse_observers(),
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};
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}
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const mouse = {
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buttons: {
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right: null,
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left: null,
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middle: null,
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},
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// Mouse Actions in Window Coordinates
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window: _context_coords(),
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// Mouse Actions in Canvas Coordinates
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canvas: _context_coords(),
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// Mouse Actions in World Coordinates
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world: _context_coords(),
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listen: {
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window: _context_observers(),
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canvas: _context_observers(),
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world: _context_observers(),
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},
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};
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function _mouse_state_snapshot() {
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return {
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buttons: window.structuredClone(mouse.buttons),
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window: window.structuredClone(mouse.window),
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canvas: window.structuredClone(mouse.canvas),
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world: window.structuredClone(mouse.world),
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};
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}
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const _double_click_timeout = {};
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const _drag_start_timeout = {};
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window.onmousedown = (evn) => {
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const time = new Date();
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// Processes for a named button
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const onhold = (key) => () => {
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if (_double_click_timeout[key]) {
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// ondclick event
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['window', 'canvas', 'world'].forEach((ctx) =>
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mouse.listen[ctx][key].ondclick.emit({
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target: evn.target,
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buttonId: evn.button,
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x: mouse[ctx].pos.x,
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y: mouse[ctx].pos.y,
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timestamp: new Date(),
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})
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);
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} else {
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// Start timer
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_double_click_timeout[key] = setTimeout(
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() => delete _double_click_timeout[key],
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inputConfig.dClickTiming
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);
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}
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// Set drag start timeout
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_drag_start_timeout[key] = setTimeout(() => {
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['window', 'canvas', 'world'].forEach((ctx) => {
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mouse.listen[ctx][key].ondragstart.emit({
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target: evn.target,
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buttonId: evn.button,
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x: mouse[ctx].pos.x,
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y: mouse[ctx].pos.y,
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timestamp: new Date(),
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});
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if (mouse[ctx].dragging[key])
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mouse[ctx].dragging[key].drag = true;
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delete _drag_start_timeout[key];
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});
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}, inputConfig.clickTiming);
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['window', 'canvas', 'world'].forEach((ctx) => {
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mouse.buttons[key] = time;
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mouse[ctx].dragging[key] = {};
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Object.assign(mouse[ctx].dragging[key], mouse[ctx].pos);
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// onpaintstart event
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mouse.listen[ctx][key].onpaintstart.emit({
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target: evn.target,
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buttonId: evn.button,
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x: mouse[ctx].pos.x,
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y: mouse[ctx].pos.y,
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timestamp: new Date(),
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});
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});
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};
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// Runs the correct handler
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const buttons = [onhold('left'), onhold('middle'), onhold('right')];
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buttons[evn.button] && buttons[evn.button]();
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};
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window.onmouseup = (evn) => {
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const time = new Date();
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// Processes for a named button
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const onrelease = (key) => () => {
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['window', 'canvas', 'world'].forEach((ctx) => {
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const start = {
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x: mouse[ctx].dragging[key].x,
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y: mouse[ctx].dragging[key].y,
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};
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// onclick event
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const dx = mouse[ctx].pos.x - start.x;
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const dy = mouse[ctx].pos.y - start.y;
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if (
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time.getTime() - mouse.buttons[key].getTime() <
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inputConfig.clickTiming &&
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dx * dx + dy * dy <
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inputConfig.clickRadius * inputConfig.clickRadius
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)
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mouse.listen[ctx][key].onclick.emit({
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target: evn.target,
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buttonId: evn.button,
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x: mouse[ctx].pos.x,
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y: mouse[ctx].pos.y,
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timestamp: new Date(),
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});
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// onpaintend event
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mouse.listen[ctx][key].onpaintend.emit({
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target: evn.target,
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buttonId: evn.button,
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x: mouse[ctx].pos.x,
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y: mouse[ctx].pos.y,
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timestamp: new Date(),
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});
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// ondragend event
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if (mouse[ctx].dragging[key].drag)
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mouse.listen[ctx][key].ondragend.emit({
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target: evn.target,
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buttonId: evn.button,
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x: mouse[ctx].pos.x,
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y: mouse[ctx].pos.y,
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timestamp: new Date(),
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});
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mouse[ctx].dragging[key] = null;
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});
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if (_drag_start_timeout[key] !== undefined) {
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clearTimeout(_drag_start_timeout[key]);
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delete _drag_start_timeout[key];
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}
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mouse.buttons[key] = null;
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};
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// Runs the correct handler
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const buttons = [
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onrelease('left'),
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onrelease('middle'),
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onrelease('right'),
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];
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buttons[evn.button] && buttons[evn.button]();
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};
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window.onmousemove = (evn) => {
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// Set Window Coordinates
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Object.assign(mouse.window.prev, mouse.window.pos);
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mouse.window.pos = { x: evn.clientX, y: evn.clientY };
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// Set Canvas Coordinates (using overlay canvas as reference)
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if (evn.target.id === 'overlayCanvas') {
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Object.assign(mouse.canvas.prev, mouse.canvas.pos);
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mouse.canvas.pos = { x: evn.layerX, y: evn.layerY };
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}
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// Set World Coordinates (For now the same as canvas coords; Will be useful with infinite canvas)
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if (evn.target.id === 'overlayCanvas') {
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Object.assign(mouse.world.prev, mouse.world.pos);
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mouse.world.pos = { x: evn.layerX, y: evn.layerY };
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}
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['window', 'canvas', 'world'].forEach((ctx) => {
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mouse.listen[ctx].onmousemove.emit({
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target: evn.target,
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px: mouse[ctx].prev.x,
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py: mouse[ctx].prev.y,
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x: mouse[ctx].pos.x,
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y: mouse[ctx].pos.y,
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timestamp: new Date(),
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});
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['left', 'middle', 'right'].forEach((key) => {
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// ondrag event
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if (mouse[ctx].dragging[key] && mouse[ctx].dragging[key].drag)
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mouse.listen[ctx][key].ondrag.emit({
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target: evn.target,
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px: mouse[ctx].prev.x,
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py: mouse[ctx].prev.y,
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x: mouse[ctx].pos.x,
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y: mouse[ctx].pos.y,
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timestamp: new Date(),
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});
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// onpaint event
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if (mouse[ctx].dragging[key])
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mouse.listen[ctx][key].onpaint.emit({
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target: evn.target,
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px: mouse[ctx].prev.x,
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py: mouse[ctx].prev.y,
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x: mouse[ctx].pos.x,
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y: mouse[ctx].pos.y,
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timestamp: new Date(),
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});
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});
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});
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};
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/** MOUSE DEBUG */
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/*
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mouse.listen.window.right.onclick.on(() =>
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console.debug('mouse.listen.window.right.onclick')
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);
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mouse.listen.window.right.ondclick.on(() =>
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console.debug('mouse.listen.window.right.ondclick')
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);
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mouse.listen.window.right.ondragstart.on(() =>
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console.debug('mouse.listen.window.right.ondragstart')
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);
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mouse.listen.window.right.ondrag.on(() =>
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console.debug('mouse.listen.window.right.ondrag')
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);
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mouse.listen.window.right.ondragend.on(() =>
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console.debug('mouse.listen.window.right.ondragend')
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);
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mouse.listen.window.right.onpaintstart.on(() =>
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console.debug('mouse.listen.window.right.onpaintstart')
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);
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mouse.listen.window.right.onpaint.on(() =>
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console.debug('mouse.listen.window.right.onpaint')
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);
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mouse.listen.window.right.onpaintend.on(() =>
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console.debug('mouse.listen.window.right.onpaintend')
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);
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*/
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/**
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* Mouse input processing
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*/
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