/
mouseeventprovider.ts
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/
mouseeventprovider.ts
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/* spellchecker: disable */
import { Observable, ReplaySubject } from 'rxjs';
import { assert, bitInBitfield } from './auxiliaries';
import { IS_EDGE, IS_IE11 } from './msagent';
import { PointerLock } from './pointerlock';
/* spellchecker: enable */
export class MouseEventProvider {
/**
* HTML canvas element within the HTML5 document to register event listeners to.
*/
protected _element: HTMLCanvasElement;
/**
* Time frame for events to be buffered (windowTime in rxjs per ReplaySubject).
*/
protected _timeframe: number | undefined;
protected _clickListener: { (event: MouseEvent): void };
protected _clickSubject: ReplaySubject<MouseEvent>;
protected _enterListener: { (event: MouseEvent): void };
protected _enterSubject: ReplaySubject<MouseEvent>;
protected _leaveListener: { (event: MouseEvent): void };
protected _leaveSubject: ReplaySubject<MouseEvent>;
protected _downListener: { (event: MouseEvent): void };
protected _downSubject: ReplaySubject<MouseEvent>;
protected _upListener: { (event: MouseEvent): void };
protected _upSubject: ReplaySubject<MouseEvent>;
protected _moveListener: { (event: MouseEvent): void };
protected _moveSubject: ReplaySubject<MouseEvent>;
protected _wheelListener: { (event: WheelEvent): void };
protected _wheelSubject: ReplaySubject<WheelEvent>;
protected _dragListener: { (event: DragEvent): void };
protected _dragSubject: ReplaySubject<DragEvent>;
/** @see {@link pointerLock} */
protected _pointerLockRequestPending = false;
/**
* This mask saves for which types of events, event.preventDefault should be called. This is useful to disallow
* some kinds of standard events like scrolling or clicking on links.
*/
protected _preventDefaultMask: MouseEventProvider.Type;
constructor(element: HTMLCanvasElement, timeframe?: number) {
assert(element !== undefined, `expected valid canvas element on initialization, given ${element}`);
this._element = element;
this._timeframe = timeframe;
this._element.addEventListener('click', () => this.processPointerLockRequests());
/* Prevent unintentional drag content detection by Microsoft Edge/IE11, e.g., when processing mouse move events
during mouse down and up. */
if (IS_EDGE || IS_IE11) {
this._element.addEventListener('dragstart', (event: DragEvent) => event.preventDefault());
}
}
/**
* The pointer lock API requires a little workaround in order to avoid something like '... not called from inside a
* short running user-generated event handler'. A click event listener is registered and whenever a pointer lock is
* requested, e.g., from an event handler (which in turn exposes this interface to, e.g., a navigation), the next
* click will result in a probably more successful pointer lock.
*/
protected processPointerLockRequests(): void {
if (!this._pointerLockRequestPending) {
return;
}
PointerLock.request(this._element);
}
/**
* Checks whether or not to prevent the default handling of the given event. This depends on the internal
* `preventDefaultMask` which can be modified using `preventDefault` function @see{@link preventDefault}.
* @param type - Internal event type of the incoming event.
* @param event - Actual event to prevent default handling on (if masked).
*/
protected preventDefaultOnEvent(type: MouseEventProvider.Type, event: MouseEvent): void {
if (bitInBitfield(this._preventDefaultMask, type)) {
event.preventDefault();
}
}
/**
* Prevent default event handling on specific event types (using preventDefault on the event).
* @param types - Event types to prevent default handling on.
*/
preventDefault(...types: MouseEventProvider.Type[]): void {
for (const type of types) {
if (!bitInBitfield(this._preventDefaultMask, type)) {
this._preventDefaultMask |= type;
}
}
}
/**
* Allow default event handling on specific event types (not calling preventDefault on the event).
* @param types - Event types to allow default handling on.
*/
allowDefault(...types: MouseEventProvider.Type[]): void {
for (const type of types) {
if (bitInBitfield(this._preventDefaultMask, type)) {
this._preventDefaultMask &= ~type;
}
}
}
observable(type: MouseEventProvider.Type): Observable<MouseEvent>
| Observable<WheelEvent> | Observable<DragEvent> | undefined {
switch (type) {
case MouseEventProvider.Type.Click:
return this.click$;
case MouseEventProvider.Type.Enter:
return this.enter$;
case MouseEventProvider.Type.Leave:
return this.leave$;
case MouseEventProvider.Type.Down:
return this.down$;
case MouseEventProvider.Type.Up:
return this.up$;
case MouseEventProvider.Type.Move:
return this.move$;
case MouseEventProvider.Type.Wheel:
return this.wheel$;
case MouseEventProvider.Type.Drag:
return this.drag$;
default:
return undefined;
}
}
/**
* Enable/disable pointer lock on click. If true, the next click on this event provider's canvas will invoke a
* pointer lock request on the canvas element.
*/
set pointerLock(lock: boolean) {
this._pointerLockRequestPending = lock;
if (lock === false) {
this._pointerLockRequestPending = false;
PointerLock.exit();
}
}
get pointerLock(): boolean {
return PointerLock.active(this._element);
}
get click$(): Observable<MouseEvent> {
if (this._clickSubject === undefined) {
this._clickSubject = new ReplaySubject<MouseEvent>(undefined, this._timeframe);
this._clickListener = (event: MouseEvent) => {
this.preventDefaultOnEvent(MouseEventProvider.Type.Click, event);
this._clickSubject.next(event);
};
this._element.addEventListener('click', this._clickListener);
}
return this._clickSubject.asObservable();
}
get enter$(): Observable<MouseEvent> {
if (this._enterSubject === undefined) {
this._enterSubject = new ReplaySubject<MouseEvent>(undefined, this._timeframe);
this._enterListener = (event: MouseEvent) => {
this.preventDefaultOnEvent(MouseEventProvider.Type.Enter, event);
this._enterSubject.next(event);
};
this._element.addEventListener('mouseenter', this._enterListener);
}
return this._enterSubject.asObservable();
}
get leave$(): Observable<MouseEvent> {
if (this._leaveSubject === undefined) {
this._leaveSubject = new ReplaySubject<MouseEvent>(undefined, this._timeframe);
this._leaveListener = (event: MouseEvent) => {
this.preventDefaultOnEvent(MouseEventProvider.Type.Leave, event);
this._leaveSubject.next(event);
};
this._element.addEventListener('mouseleave', this._leaveListener);
}
return this._leaveSubject.asObservable();
}
get down$(): Observable<MouseEvent> {
if (this._downSubject === undefined) {
this._downSubject = new ReplaySubject<MouseEvent>(undefined, this._timeframe);
this._downListener = (event: MouseEvent) => {
this.preventDefaultOnEvent(MouseEventProvider.Type.Down, event);
this._downSubject.next(event);
};
this._element.addEventListener('mousedown', this._downListener);
}
return this._downSubject.asObservable();
}
get up$(): Observable<MouseEvent> {
if (this._upSubject === undefined) {
this._upSubject = new ReplaySubject<MouseEvent>(undefined, this._timeframe);
this._upListener = (event: MouseEvent) => {
this.preventDefaultOnEvent(MouseEventProvider.Type.Up, event);
this._upSubject.next(event);
};
this._element.addEventListener('mouseup', this._upListener);
}
return this._upSubject.asObservable();
}
get move$(): Observable<MouseEvent> {
if (this._moveSubject === undefined) {
this._moveSubject = new ReplaySubject<MouseEvent>(undefined, this._timeframe);
this._moveListener = (event: MouseEvent) => {
this.preventDefaultOnEvent(MouseEventProvider.Type.Move, event);
this._moveSubject.next(event);
};
this._element.addEventListener('mousemove', this._moveListener);
}
return this._moveSubject.asObservable();
}
get wheel$(): Observable<WheelEvent> {
if (this._wheelSubject === undefined) {
this._wheelSubject = new ReplaySubject<WheelEvent>(undefined, this._timeframe);
this._wheelListener = (event: WheelEvent) => {
this.preventDefaultOnEvent(MouseEventProvider.Type.Wheel, event);
this._wheelSubject.next(event);
};
this._element.addEventListener('wheel', this._wheelListener);
}
return this._wheelSubject.asObservable();
}
get drag$(): Observable<DragEvent> {
if (this._dragSubject === undefined) {
this._dragSubject = new ReplaySubject<DragEvent>(undefined, this._timeframe);
this._dragListener = (event: DragEvent) => {
this.preventDefaultOnEvent(MouseEventProvider.Type.Drag, event);
this._dragSubject.next(event);
};
this._element.addEventListener('drag', this._dragListener);
}
return this._dragSubject.asObservable();
}
}
export namespace MouseEventProvider {
export enum Type {
Click = 1 << 0,
Wheel = 1 << 1,
Enter = 1 << 2,
Leave = 1 << 3,
Move = 1 << 4,
Down = 1 << 5,
Up = 1 << 6,
Drag = 1 << 7,
}
}