@tolokoban/tgd
Version:
ToloGameDev library for WebGL2
111 lines • 10.3 kB
JavaScript
import { TgdEvent } from "./../event/index.js";
const MOUSE_BUTTON_RIGHT = 2;
export class TgdInputPointerImpl {
constructor(canvas) {
this.canvas = canvas;
this.eventTap = new TgdEvent();
this.eventMoveStart = new TgdEvent();
this.eventMove = new TgdEvent();
this.eventMoveEnd = new TgdEvent();
this.eventZoom = new TgdEvent();
/**
* This is a tap only of the pointer touched for less that
* `tapDelay` milliseconds.
*/
this.tapDelay = 300;
this.controlKeys = {
altKey: false,
ctrlKey: false,
metaKey: false,
shiftKey: false,
};
this.start = {
x: 0,
y: 0,
t: 0,
fingersCount: 1,
};
this.current = {
x: 0,
y: 0,
t: 0,
fingersCount: 1,
};
this.previous = {
x: 0,
y: 0,
t: 0,
fingersCount: 1,
};
/**
* If not null, the pointer is touching.
*/
this.pointerEvent = null;
this.handleContextMenu = (event) => {
event.preventDefault();
};
this.handleCanvasWheel = (event) => {
let delta = event.deltaX + event.deltaY + event.deltaZ;
delta = delta > 0 ? 1 : -1;
this.eventZoom.dispatch(Object.assign({ current: this.getPoint(event), direction: delta, preventDefault: () => event.preventDefault() }, this.controlKeys));
};
this.handlePointerDown = (event) => {
if (!event.isPrimary)
return;
this.canvas.setPointerCapture(event.pointerId);
event.preventDefault();
event.stopPropagation();
this.pointerEvent = event;
const point = this.getPoint(event);
this.start = this.current = this.previous = point;
this.eventMoveStart.dispatch(Object.assign({ start: point, current: point, previous: point }, this.controlKeys));
};
this.handlePointerMove = (event) => {
if (!event.isPrimary || !this.pointerEvent || !this.canvas)
return;
this.previous = this.current;
this.current = this.getPoint(event);
this.eventMove.dispatch(Object.assign({ start: this.start, current: this.current, previous: this.previous }, this.controlKeys));
};
this.handlePointerUp = (event) => {
if (!event.isPrimary || !this.pointerEvent)
return;
event.preventDefault();
this.current = this.getPoint(event);
this.eventMoveEnd.dispatch(Object.assign({ start: this.start, current: this.current, previous: this.previous }, this.controlKeys));
this.pointerEvent = null;
// Tap event.
if (event.timeStamp - this.start.t < this.tapDelay) {
this.eventTap.dispatch(Object.assign(Object.assign({}, this.start), this.controlKeys));
}
};
canvas.addEventListener("pointerdown", this.handlePointerDown, true);
canvas.addEventListener("wheel", this.handleCanvasWheel);
canvas.addEventListener("contextmenu", this.handleContextMenu);
canvas.addEventListener("pointermove", this.handlePointerMove);
canvas.addEventListener("pointerup", this.handlePointerUp);
}
detach() {
const { canvas } = this;
if (!canvas)
return;
canvas.removeEventListener("pointerdown", this.handlePointerDown);
canvas.removeEventListener("wheel", this.handleCanvasWheel);
canvas.removeEventListener("contextmenu", this.handleContextMenu);
canvas.removeEventListener("pointermove", this.handlePointerMove);
canvas.removeEventListener("pointerup", this.handlePointerUp);
}
getPoint(event) {
this.controlKeys = {
altKey: event.altKey || event.buttons === MOUSE_BUTTON_RIGHT,
ctrlKey: event.ctrlKey,
metaKey: event.metaKey,
shiftKey: event.shiftKey,
};
const { left, top, width, height } = this.canvas.getBoundingClientRect();
const x = 2 * ((event.clientX - left) / width - 0.5);
const y = -2 * ((event.clientY - top) / height - 0.5);
return { x, y, t: event.timeStamp, fingersCount: 1 };
}
}
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