playcanvas/build/playcanvas/src/platform/input/mouse-event.js

PlayCanvas WebGL game engine

import { MOUSEBUTTON_NONE } from './constants.js';

function isMousePointerLocked() {
		return !!(document.pointerLockElement || document.mozPointerLockElement || document.webkitPointerLockElement);
}
class MouseEvent {
		constructor(mouse, event){
				this.x = 0;
				this.y = 0;
				this.dx = 0;
				this.dy = 0;
				this.button = MOUSEBUTTON_NONE;
				this.wheelDelta = 0;
				this.ctrlKey = false;
				this.altKey = false;
				this.shiftKey = false;
				this.metaKey = false;
				let coords = {
						x: 0,
						y: 0
				};
				if (event) {
						if (event instanceof MouseEvent) {
								throw Error('Expected MouseEvent');
						}
						coords = mouse._getTargetCoords(event);
				} else {
						event = {};
				}
				if (coords) {
						this.x = coords.x;
						this.y = coords.y;
				} else if (isMousePointerLocked()) {
						this.x = 0;
						this.y = 0;
				} else {
						return;
				}
				if (event.type === 'wheel') {
						if (event.deltaY > 0) {
								this.wheelDelta = 1;
						} else if (event.deltaY < 0) {
								this.wheelDelta = -1;
						}
				}
				if (isMousePointerLocked()) {
						this.dx = event.movementX || event.webkitMovementX || event.mozMovementX || 0;
						this.dy = event.movementY || event.webkitMovementY || event.mozMovementY || 0;
				} else {
						this.dx = this.x - mouse._lastX;
						this.dy = this.y - mouse._lastY;
				}
				if (event.type === 'mousedown' || event.type === 'mouseup') {
						this.button = event.button;
				}
				this.buttons = mouse._buttons.slice(0);
				this.element = event.target;
				this.ctrlKey = event.ctrlKey ?? false;
				this.altKey = event.altKey ?? false;
				this.shiftKey = event.shiftKey ?? false;
				this.metaKey = event.metaKey ?? false;
				this.event = event;
		}
}

export { MouseEvent, isMousePointerLocked };