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import { useLayoutEffect, useRef } from '@wordpress/element';
import { clamp } from '@agent/lib/util';
export const useDraggable = ({ el, open, initialPosition, onDragEnd }) => {
const offset = useRef({ x: 0, y: 0 });
const pointerIdRef = useRef(null);
const lastPosition = useRef({
x: initialPosition.x,
y: initialPosition.y,
});
useLayoutEffect(() => {
if (!el) return;
const id = requestAnimationFrame(() => {
el.style.setProperty('left', `${initialPosition.x}px`, 'important');
el.style.setProperty('top', `${initialPosition.y}px`, 'important');
});
return () => cancelAnimationFrame(id);
}, [el, initialPosition]);
useLayoutEffect(() => {
if (!el || !open) return;
// keep in bounds
const minX = 0;
const minY = 0;
const maxX = window.innerWidth - el.offsetWidth;
const maxY = window.innerHeight - el.offsetHeight;
const left = parseFloat(el.style.left) || 0;
const top = parseFloat(el.style.top) || 0;
const x = clamp(left, minX, maxX);
const y = clamp(top, minY, maxY);
if (left !== x || top !== y) {
el.style.setProperty('left', `${x}px`, 'important');
el.style.setProperty('top', `${y}px`, 'important');
}
}, [el, open]);
useLayoutEffect(() => {
const bg =
document.getElementById('wpwrap') ||
// TODO: is this on all block themes?
document.querySelector('.wp-site-blocks');
if (!el || !open || !bg) return;
const handle = el.querySelector('[data-extendify-agent-handle]');
if (!(handle instanceof HTMLElement)) return;
el.style.setProperty('left', `${initialPosition.x}px`, 'important');
el.style.setProperty('top', `${initialPosition.y}px`, 'important');
const onPointerDown = (e) => {
e.preventDefault();
e.stopPropagation();
bg.style.pointerEvents = 'none';
if (pointerIdRef.current !== null) {
return;
}
pointerIdRef.current = e.pointerId;
handle.setPointerCapture(e.pointerId);
offset.current = {
x: e.clientX - el.offsetLeft,
y: e.clientY - el.offsetTop,
};
document.addEventListener('pointermove', onPointerMove);
document.addEventListener('pointerup', onPointerUp);
};
const onPointerMove = (e) => {
const minX = 0;
const minY = 0;
const maxX = window.innerWidth - handle.offsetWidth;
const maxY = window.innerHeight - handle.offsetHeight;
const x = clamp(e.clientX - offset.current.x, minX, maxX);
const y = clamp(e.clientY - offset.current.y, minY, maxY);
el.style.setProperty('left', `${x}px`, 'important');
el.style.setProperty('top', `${y}px`, 'important');
lastPosition.current = { x, y };
};
const onPointerUp = (e) => {
bg.style.pointerEvents = 'auto';
if (pointerIdRef.current !== e.pointerId) {
return;
}
pointerIdRef.current = null;
handle.releasePointerCapture(e.pointerId);
document.removeEventListener('pointermove', onPointerMove);
document.removeEventListener('pointerup', onPointerUp);
onDragEnd(lastPosition.current.x, lastPosition.current.y);
};
const onBlur = () => onPointerUp(new PointerEvent('pointerup'));
const onContextMenu = (e) => {
e.preventDefault();
e.stopPropagation();
return false;
};
handle.addEventListener('pointerdown', onPointerDown);
handle.addEventListener('contextmenu', onContextMenu);
handle.addEventListener('blur', onBlur);
return () => {
handle.removeEventListener('pointerdown', onPointerDown);
handle.removeEventListener('blur', onBlur);
handle.removeEventListener('contextmenu', onContextMenu);
document.removeEventListener('pointermove', onPointerMove);
document.removeEventListener('pointerup', onPointerUp);
bg.style.pointerEvents = 'auto';
if (pointerIdRef.current !== null) {
handle.releasePointerCapture(pointerIdRef.current);
pointerIdRef.current = null;
}
};
}, [el, open, initialPosition.x, initialPosition.y, onDragEnd]);
};