mapstate_reducer.js

/* @flow */

var MapStateConstants = require('../constants/mapstate_constants');
var SharedConstants = require('../constants/shared_constants');
var Immutable = require('immutable');
var zoomRange = require('../data/zoom_range');

function storeCreator(source) {

  const initialState = Immutable.fromJS({
    zoom: 0,
    bearing: 0,
    center: [0, 0],
    pitch: 0,
    debug: false,
    collisionDebug: false,
    backgroundStyleURL: 'mapbox://styles/mapbox/dataset-dark-v1'
  });

  return (state: Immutable.Map = initialState, action: Object): Immutable.Map => {
    if (action.source !== source) return;
    switch (action.type) {
      case SharedConstants.SHARED_PURGE:
        return initialState;
      case MapStateConstants.MAPSTATE_UPDATE:
        return state.mergeDeep(Immutable.fromJS(action.value));

      case MapStateConstants.MAPSTATE_CLEAN:
        return state.set('dirty', false);

      case MapStateConstants.MAPSTATE_ZOOM_IN:
        return state.update('zoom', zoom => {
          return Math.min(Math.round(zoom + 1), zoomRange.MAX_ZOOM);
        }).set('dirty', true);
      case MapStateConstants.MAPSTATE_ZOOM_OUT:
        return state.update('zoom', zoom => {
          return Math.max(Math.round(zoom - 1), zoomRange.MIN_ZOOM);
        }).set('dirty', true);
      case MapStateConstants.MAPSTATE_ZOOM_SET:
        return state.set('zoom', action.value).set('dirty', true);
      case MapStateConstants.MAPSTATE_DEBUG:
        return state.set('debug', action.value).set('dirty', true);
      case MapStateConstants.MAPSTATE_COLLISION_DEBUG:
        return state.set('collisionDebug', action.value).set('dirty', true);
      case MapStateConstants.MAPSTATE_RESET_NORTH:
        return state.set('bearing', 0).set('dirty', true);
      case MapStateConstants.MAPSTATE_SET_BACKGROUND_STYLE_URL:
        return state.set('backgroundStyleURL', action.backgroundStyleURL);
      case MapStateConstants.MAPSTATE_RESET_PITCH:
        return state.set('pitch', 0).set('dirty', true);
      case MapStateConstants.MAPSTATE_VIEW:
        return state
          .set('zoom', action.zoom)
          .set('center', Immutable.fromJS(action.center))
          .set('bearing', action.bearing)
          .set('pitch', action.pitch)
          .set('dirty', true);
    }
    return state;
  };

};