index.mjs
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import { Feature, frame } from 'motion-dom';
import { noop } from 'motion-utils';
import { addPointerEvent } from '../../events/add-pointer-event.mjs';
import { getContextWindow } from '../../utils/get-context-window.mjs';
import { PanSession } from './PanSession.mjs';
const asyncHandler = (handler) => (event, info) => {
if (handler) {
frame.update(() => handler(event, info), false, true);
}
};
class PanGesture extends Feature {
constructor() {
super(...arguments);
this.removePointerDownListener = noop;
}
onPointerDown(pointerDownEvent) {
this.session = new PanSession(pointerDownEvent, this.createPanHandlers(), {
transformPagePoint: this.node.getTransformPagePoint(),
contextWindow: getContextWindow(this.node),
});
}
createPanHandlers() {
const { onPanSessionStart, onPanStart, onPan, onPanEnd } = this.node.getProps();
return {
onSessionStart: asyncHandler(onPanSessionStart),
onStart: asyncHandler(onPanStart),
onMove: asyncHandler(onPan),
onEnd: (event, info) => {
delete this.session;
if (onPanEnd) {
frame.postRender(() => onPanEnd(event, info));
}
},
};
}
mount() {
this.removePointerDownListener = addPointerEvent(this.node.current, "pointerdown", (event) => this.onPointerDown(event));
}
update() {
this.session && this.session.updateHandlers(this.createPanHandlers());
}
unmount() {
this.removePointerDownListener();
this.session && this.session.end();
}
}
export { PanGesture };
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