49 lines
1.5 KiB
JavaScript
49 lines
1.5 KiB
JavaScript
import { Platform } from '../platform';
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export class MouseWheelHandle {
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constructor(target, onWheelCallback, onWheelGuard) {
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this.animationFrameId = 0;
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this.deltaX = 0;
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this.deltaY = 0;
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this.eventName = Platform.isEventSupported('wheel')
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? 'wheel'
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: 'mousewheel';
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this.target = target;
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this.onWheelCallback = onWheelCallback;
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this.onWheelGuard = onWheelGuard;
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this.onWheel = this.onWheel.bind(this);
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this.didWheel = this.didWheel.bind(this);
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}
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enable() {
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this.target.addEventListener(this.eventName, this.onWheel, {
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passive: false,
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});
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}
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disable() {
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this.target.removeEventListener(this.eventName, this.onWheel);
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}
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onWheel(e) {
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if (this.onWheelGuard != null && !this.onWheelGuard(e)) {
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return;
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}
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this.deltaX += e.deltaX;
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this.deltaY += e.deltaY;
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e.preventDefault();
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let changed;
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if (this.deltaX !== 0 || this.deltaY !== 0) {
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e.stopPropagation();
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changed = true;
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}
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if (changed === true && this.animationFrameId === 0) {
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this.animationFrameId = requestAnimationFrame(() => {
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this.didWheel(e);
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});
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}
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}
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didWheel(e) {
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this.animationFrameId = 0;
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this.onWheelCallback(e, this.deltaX, this.deltaY);
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this.deltaX = 0;
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this.deltaY = 0;
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}
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}
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//# sourceMappingURL=mousewheel.js.map
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