@goongmaps/goong-map-react/dist/es6/components/draggable-control.js

A fork of react-map-gl. React components for Goong JS

import * as PropTypes from 'prop-types';
import { useState, useEffect } from 'react';
import useMapControl, { mapControlDefaultProps, mapControlPropTypes } from './use-map-control';
export const draggableControlPropTypes = Object.assign({}, mapControlPropTypes, {
  draggable: PropTypes.bool,
  onDrag: PropTypes.func,
  onDragEnd: PropTypes.func,
  onDragStart: PropTypes.func,
  offsetLeft: PropTypes.number,
  offsetTop: PropTypes.number
});
export const draggableControlDefaultProps = Object.assign({}, mapControlDefaultProps, {
  draggable: false,
  offsetLeft: 0,
  offsetTop: 0
});
function getDragEventPosition(event) {
  const {
    offsetCenter: {
      x,
      y
    }
  } = event;
  return [x, y];
}
function getDragEventOffset(event, container) {
  const {
    center: {
      x,
      y
    }
  } = event;
  if (container) {
    const rect = container.getBoundingClientRect();
    return [rect.left - x, rect.top - y];
  }
  return null;
}
function getDragLngLat(dragPos, dragOffset, props, context) {
  const x = dragPos[0] + dragOffset[0] - props.offsetLeft;
  const y = dragPos[1] + dragOffset[1] - props.offsetTop;
  return context.viewport.unproject([x, y]);
}
function onDragStart(event, _ref) {
  let {
    props,
    callbacks,
    state,
    context,
    containerRef
  } = _ref;
  const {
    draggable
  } = props;
  if (!draggable) {
    return;
  }
  event.stopPropagation();
  const dragPos = getDragEventPosition(event);
  const dragOffset = getDragEventOffset(event, containerRef.current);
  state.setDragPos(dragPos);
  state.setDragOffset(dragOffset);
  if (callbacks.onDragStart && dragOffset) {
    const callbackEvent = Object.assign({}, event);
    callbackEvent.lngLat = getDragLngLat(dragPos, dragOffset, props, context);
    callbacks.onDragStart(callbackEvent);
  }
}
function onDrag(event, _ref2) {
  let {
    props,
    callbacks,
    state,
    context
  } = _ref2;
  event.stopPropagation();
  const dragPos = getDragEventPosition(event);
  state.setDragPos(dragPos);
  const {
    dragOffset
  } = state;
  if (callbacks.onDrag && dragOffset) {
    const callbackEvent = Object.assign({}, event);
    callbackEvent.lngLat = getDragLngLat(dragPos, dragOffset, props, context);
    callbacks.onDrag(callbackEvent);
  }
}
function onDragEnd(event, _ref3) {
  let {
    props,
    callbacks,
    state,
    context
  } = _ref3;
  event.stopPropagation();
  const {
    dragPos,
    dragOffset
  } = state;
  state.setDragPos(null);
  state.setDragOffset(null);
  if (callbacks.onDragEnd && dragPos && dragOffset) {
    const callbackEvent = Object.assign({}, event);
    callbackEvent.lngLat = getDragLngLat(dragPos, dragOffset, props, context);
    callbacks.onDragEnd(callbackEvent);
  }
}
function onDragCancel(event, _ref4) {
  let {
    state
  } = _ref4;
  event.stopPropagation();
  state.setDragPos(null);
  state.setDragOffset(null);
}
function registerEvents(thisRef) {
  const {
    eventManager
  } = thisRef.context;
  if (!eventManager || !thisRef.state.dragPos) {
    return undefined;
  }
  const events = {
    panmove: evt => onDrag(evt, thisRef),
    panend: evt => onDragEnd(evt, thisRef),
    pancancel: evt => onDragCancel(evt, thisRef)
  };
  eventManager.watch(events);
  return () => {
    eventManager.off(events);
  };
}
export default function useDraggableControl(props) {
  const [dragPos, setDragPos] = useState(null);
  const [dragOffset, setDragOffset] = useState(null);
  const thisRef = useMapControl({
    ...props,
    onDragStart
  });
  thisRef.callbacks = props;
  thisRef.state.dragPos = dragPos;
  thisRef.state.setDragPos = setDragPos;
  thisRef.state.dragOffset = dragOffset;
  thisRef.state.setDragOffset = setDragOffset;
  useEffect(() => registerEvents(thisRef), [thisRef.context.eventManager, Boolean(dragPos)]);
  return thisRef;
}
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