_getCursorEditHandle()

in modules/react-map-gl-draw/src/edit-modes/editing-mode.ts [254:298]

• 34 lines of code
• 10 McCabe index (conditional complexity)

  _getCursorEditHandle(event: PointerMoveEvent, feature: Feature) {
    // event can be null when the user has not interacted with the map whatsoever
    // and therefore props.lastPointerMoveEvent is still null
    // returning null here means we can e.g. set a featureIndex without requiring an event
    if (!event) {
      return null;
    }

    // @ts-expect-error check event type
    const { isDragging, picks } = event;
    // if not pick segment
    const picked = picks && picks[0];
    if (!picked || !isNumeric(picked.featureIndex) || picked.type !== ELEMENT_TYPE.SEGMENT) {
      return null;
    }

    // if dragging or feature is neither polygon nor line string
    if (
      isDragging ||
      (feature.geometry.type !== GEOJSON_TYPE.POLYGON &&
        feature.geometry.type !== GEOJSON_TYPE.LINE_STRING)
    ) {
      return null;
    }

    const insertMapCoords = this._getPointOnSegment(feature, picked, event.mapCoords);

    if (!insertMapCoords) {
      return null;
    }

    return {
      type: 'Feature',
      properties: {
        guideType: GUIDE_TYPE.CURSOR_EDIT_HANDLE,
        shape: feature.properties.shape,
        positionIndexes: [-1],
        editHandleType: 'intermediate',
      },
      geometry: {
        type: GEOJSON_TYPE.POINT,
        coordinates: insertMapCoords,
      },
    };
  }