openlayers/test/spec/ol/control/overviewmap.test.js

import Control from '../../../../src/ol/control/Control.js';
import Map from '../../../../src/ol/Map.js';
import OverviewMap from '../../../../src/ol/control/OverviewMap.js';
import View from '../../../../src/ol/View.js';

describe('ol.control.OverviewMap', function () {
  let map, target;

  beforeEach(function () {
    target = document.createElement('div');
    document.body.appendChild(target);
    map = new Map({
      target: target,
    });
  });

  afterEach(function () {
    map.dispose();
    document.body.removeChild(target);
    map = null;
    target = null;
  });

  describe('constructor', function () {
    it('creates an overview map with the default options', function () {
      const control = new OverviewMap();
      expect(control).to.be.a(OverviewMap);
      expect(control).to.be.a(Control);
    });
  });

  describe('setMap()', function () {
    it('keeps ovmap view rotation in sync with map view rotation', function () {
      const view = new View({
        center: [0, 0],
        zoom: 0,
        rotation: Math.PI / 2,
      });
      map.setView(view);

      const control = new OverviewMap({
        rotateWithView: true,
      });
      map.addControl(control);
      const ovView = control.ovmap_.getView();
      expect(ovView.getRotation()).to.be(Math.PI / 2);

      view.setRotation(Math.PI / 4);
      expect(ovView.getRotation()).to.be(Math.PI / 4);
    });

    it('maintains rotation in sync if view added later', function () {
      const control = new OverviewMap({
        rotateWithView: true,
      });
      map.addControl(control);
      const ovInitialView = control.ovmap_.getView();
      expect(ovInitialView.getRotation()).to.be(0);

      const view = new View({
        center: [0, 0],
        zoom: 0,
        rotation: Math.PI / 2,
      });
      map.setView(view);
      const ovView = control.ovmap_.getView();
      expect(ovView.getRotation()).to.be(Math.PI / 2);

      view.setRotation(Math.PI / 4);
      expect(ovView.getRotation()).to.be(Math.PI / 4);
    });

    it('stops listening to old maps', function () {
      const control = new OverviewMap({
        rotateWithView: true,
      });

      const view = new View({
        center: [0, 0],
        zoom: 0,
        rotation: 0,
      });
      map.setView(view);
      map.addControl(control);
      const ovView = control.ovmap_.getView();

      view.setRotation(Math.PI / 8);
      expect(ovView.getRotation()).to.be(Math.PI / 8);

      map.removeControl(control);

      view.setRotation(Math.PI / 4);
      expect(ovView.getRotation()).to.be(Math.PI / 8);
    });

    it('reflects projection change of main map', function () {
      const control = new OverviewMap({
        rotateWithView: true,
      });

      map.addControl(control);
      expect(control.ovmap_.getView().getProjection().getCode()).to.be(
        'EPSG:3857'
      );

      map.setView(
        new View({
          projection: 'EPSG:4326',
        })
      );
      expect(control.ovmap_.getView().getProjection().getCode()).to.be(
        'EPSG:4326'
      );
    });

    it('retains explicitly set view', function () {
      const overviewMapView = new View();
      const control = new OverviewMap({
        rotateWithView: true,
        view: overviewMapView,
      });

      map.addControl(control);
      expect(control.ovmap_.getView()).to.be(overviewMapView);
      expect(control.ovmap_.getView().getProjection().getCode()).to.be(
        'EPSG:3857'
      );

      map.setView(
        new View({
          projection: 'EPSG:4326',
        })
      );
      expect(control.ovmap_.getView()).to.be(overviewMapView);
      expect(control.ovmap_.getView().getProjection().getCode()).to.be(
        'EPSG:3857'
      );
    });

    it('set target to null', function () {
      const control = new OverviewMap();

      map.addControl(control);

      expect(control.ovmap_.getTarget()).not.to.be(null);

      map.removeControl(control);

      expect(control.ovmap_.getTarget()).to.be(null);
    });
  });
});