handleEvent(mapBrowserEvent) {
    if (!this.condition_(mapBrowserEvent)) {
      return true;
    }
    const add = this.addCondition_(mapBrowserEvent);
    const remove = this.removeCondition_(mapBrowserEvent);
    const toggle = this.toggleCondition_(mapBrowserEvent);
    const set = !add && !remove && !toggle;
    const map = mapBrowserEvent.map;
    const features = this.getFeatures();
    const deselected = [];
    const selected = [];
    if (set) {
      // Replace the currently selected feature(s) with the feature(s) at the
      // pixel, or clear the selected feature(s) if there is no feature at
      // the pixel.
      clear(this.featureLayerAssociation_);
      map.forEachFeatureAtPixel(
        mapBrowserEvent.pixel,
        /**
         * @param {import("../Feature.js").FeatureLike} feature Feature.
         * @param {import("../layer/Layer.js").default} layer Layer.
         * @return {boolean|undefined} Continue to iterate over the features.
         */
        function (feature, layer) {
          if (this.filter_(feature, layer)) {
            selected.push(feature);
            this.addFeatureLayerAssociation_(feature, layer);
            return !this.multi_;
          }
        }.bind(this),
        {
          layerFilter: this.layerFilter_,
          hitTolerance: this.hitTolerance_,
        }
      );
      for (let i = features.getLength() - 1; i >= 0; --i) {
        const feature = features.item(i);
        const index = selected.indexOf(feature);
        if (index > -1) {
          // feature is already selected
          selected.splice(index, 1);
        } else {
          features.remove(feature);
          deselected.push(feature);
        }
      }
      if (selected.length !== 0) {
        features.extend(selected);
      }
    } else {
      // Modify the currently selected feature(s).
      map.forEachFeatureAtPixel(
        mapBrowserEvent.pixel,
        /**
         * @param {import("../Feature.js").FeatureLike} feature Feature.
         * @param {import("../layer/Layer.js").default} layer Layer.
         * @return {boolean|undefined} Continue to iterate over the features.
         */
        function (feature, layer) {
          if (this.filter_(feature, layer)) {
            if ((add || toggle) && !includes(features.getArray(), feature)) {
              selected.push(feature);
              this.addFeatureLayerAssociation_(feature, layer);
            } else if (
              (remove || toggle) &&
              includes(features.getArray(), feature)
            ) {
              deselected.push(feature);
              this.removeFeatureLayerAssociation_(feature);
            }
            return !this.multi_;
          }
        }.bind(this),
        {
          layerFilter: this.layerFilter_,
          hitTolerance: this.hitTolerance_,
        }
      );
      for (let j = deselected.length - 1; j >= 0; --j) {
        features.remove(deselected[j]);
      }
      features.extend(selected);
    }
    if (selected.length > 0 || deselected.length > 0) {
      this.dispatchEvent(
        new SelectEvent(
          SelectEventType.SELECT,
          selected,
          deselected,
          mapBrowserEvent
        )
      );
    }
    return true;
  }
/**
   * Handles the {@link module:ol/MapBrowserEvent map browser event} and may change the
   * selected state of features.
   * @param {import("../MapBrowserEvent.js").default} mapBrowserEvent Map browser event.
   * @return {boolean} `false` to stop event propagation.
   * @this {Select}
   */
Handles the  module:ol/MapBrowserEvent map browser event and may change the
selected state of features.
Handles the module : ol / MapBrowserEvent map browser event and may change the selected state of features .
handleEvent(mapBrowserEvent) {
    if (!this.condition_(mapBrowserEvent)) {
      return true;
    }
    const add = this.addCondition_(mapBrowserEvent);
    const remove = this.removeCondition_(mapBrowserEvent);
    const toggle = this.toggleCondition_(mapBrowserEvent);
    const set = !add && !remove && !toggle;
    const map = mapBrowserEvent.map;
    const features = this.getFeatures();
    const deselected = [];
    const selected = [];
    if (set) {
      clear(this.featureLayerAssociation_);
      map.forEachFeatureAtPixel(
        mapBrowserEvent.pixel,
        function (feature, layer) {
          if (this.filter_(feature, layer)) {
            selected.push(feature);
            this.addFeatureLayerAssociation_(feature, layer);
            return !this.multi_;
          }
        }.bind(this),
        {
          layerFilter: this.layerFilter_,
          hitTolerance: this.hitTolerance_,
        }
      );
      for (let i = features.getLength() - 1; i >= 0; --i) {
        const feature = features.item(i);
        const index = selected.indexOf(feature);
        if (index > -1) {
          selected.splice(index, 1);
        } else {
          features.remove(feature);
          deselected.push(feature);
        }
      }
      if (selected.length !== 0) {
        features.extend(selected);
      }
    } else {
      map.forEachFeatureAtPixel(
        mapBrowserEvent.pixel,
        function (feature, layer) {
          if (this.filter_(feature, layer)) {
            if ((add || toggle) && !includes(features.getArray(), feature)) {
              selected.push(feature);
              this.addFeatureLayerAssociation_(feature, layer);
            } else if (
              (remove || toggle) &&
              includes(features.getArray(), feature)
            ) {
              deselected.push(feature);
              this.removeFeatureLayerAssociation_(feature);
            }
            return !this.multi_;
          }
        }.bind(this),
        {
          layerFilter: this.layerFilter_,
          hitTolerance: this.hitTolerance_,
        }
      );
      for (let j = deselected.length - 1; j >= 0; --j) {
        features.remove(deselected[j]);
      }
      features.extend(selected);
    }
    if (selected.length > 0 || deselected.length > 0) {
      this.dispatchEvent(
        new SelectEvent(
          SelectEventType.SELECT,
          selected,
          deselected,
          mapBrowserEvent
        )
      );
    }
    return true;
  }
handleEvent ( mapBrowserEvent ) { if ( ! this . condition_ ( mapBrowserEvent ) ) { return true ; } const add = this . addCondition_ ( mapBrowserEvent ) ; const remove = this . removeCondition_ ( mapBrowserEvent ) ; const toggle = this . toggleCondition_ ( mapBrowserEvent ) ; const set = ! add && ! remove && ! toggle ; const map = mapBrowserEvent . map ; const features = this . getFeatures ( ) ; const deselected = [ ] ; const selected = [ ] ; if ( set ) { clear ( this . featureLayerAssociation_ ) ; map . forEachFeatureAtPixel ( mapBrowserEvent . pixel , function ( feature , layer ) { if ( this . filter_ ( feature , layer ) ) { selected . push ( feature ) ; this . addFeatureLayerAssociation_ ( feature , layer ) ; return ! this . multi_ ; } } . bind ( this ) , { layerFilter : this . layerFilter_ , hitTolerance : this . hitTolerance_ , } ) ; for ( let i = features . getLength ( ) - 1 ; i >= 0 ; -- i ) { const feature = features . item ( i ) ; const index = selected . indexOf ( feature ) ; if ( index > - 1 ) { selected . splice ( index , 1 ) ; } else { features . remove ( feature ) ; deselected . push ( feature ) ; } } if ( selected . length !== 0 ) { features . extend ( selected ) ; } } else { map . forEachFeatureAtPixel ( mapBrowserEvent . pixel , function ( feature , layer ) { if ( this . filter_ ( feature , layer ) ) { if ( ( add || toggle ) && ! includes ( features . getArray ( ) , feature ) ) { selected . push ( feature ) ; this . addFeatureLayerAssociation_ ( feature , layer ) ; } else if ( ( remove || toggle ) && includes ( features . getArray ( ) , feature ) ) { deselected . push ( feature ) ; this . removeFeatureLayerAssociation_ ( feature ) ; } return ! this . multi_ ; } } . bind ( this ) , { layerFilter : this . layerFilter_ , hitTolerance : this . hitTolerance_ , } ) ; for ( let j = deselected . length - 1 ; j >= 0 ; -- j ) { features . remove ( deselected [ j ] ) ; } features . extend ( selected ) ; } if ( selected . length > 0 || deselected . length > 0 ) { this . dispatchEvent ( new SelectEvent ( SelectEventType . SELECT , selected , deselected , mapBrowserEvent ) ) ; } return true ; }
Handles the {@link module:ol/MapBrowserEvent map browser event} and may change the
 selected state of features.
Handles the { @link module : ol / MapBrowserEvent map browser event } and may change the selected state of features .
// Replace the currently selected feature(s) with the feature(s) at the // pixel, or clear the selected feature(s) if there is no feature at // the pixel. /**
         * @param {import("../Feature.js").FeatureLike} feature Feature.
         * @param {import("../layer/Layer.js").default} layer Layer.
         * @return {boolean|undefined} Continue to iterate over the features.
         */ // feature is already selected // Modify the currently selected feature(s). /**
         * @param {import("../Feature.js").FeatureLike} feature Feature.
         * @param {import("../layer/Layer.js").default} layer Layer.
         * @return {boolean|undefined} Continue to iterate over the features.
         */