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expect(markerClusterer["reset"]).toHaveBeenCalledTimes(1); + expect(markerClusterer["reset"]).toHaveBeenCalledTimes(0); expect(markerClusterer["renderClusters"]).toHaveBeenCalledTimes(1); }); @@ -125,6 +134,86 @@ describe.each(markerClasses)( expect(deleteSpy).toHaveBeenCalledTimes(1); }); + test("markerClusterer render should not remove markers from the map if they were already rendered", () => { + const marker = new markerClass(); + const markers: Marker[] = [marker]; + + const algorithm = { + calculate: jest.fn().mockReturnValue({ + clusters: [new Cluster({ markers })], + changed: true, + }), + }; + const markerClusterer = new MarkerClusterer({ + markers, + algorithm, + }); + markerClusterer.getMap = jest.fn().mockImplementation(() => map); + markerClusterer.getProjection = jest + .fn() + .mockImplementation(() => jest.fn()); + markerClusterer["renderClusters"] = jest.fn(); + markerClusterer["clusters"] = [new Cluster({ markers })]; + + MarkerUtils.setMap = jest.fn().mockImplementation(() => null); + + markerClusterer["render"](); + + expect(MarkerUtils.setMap).toHaveBeenCalledTimes(0); + }); + + test("markerClusterer render should remove markers from the map if they are no more rendered", () => { + const marker = new markerClass(); + const markers: Marker[] = [marker]; + + const algorithm = { + calculate: jest.fn().mockReturnValue({ clusters: [], changed: true }), + }; + const markerClusterer = new MarkerClusterer({ + markers, + algorithm, + }); + markerClusterer.getMap = jest.fn().mockImplementation(() => map); + markerClusterer.getProjection = jest + .fn() + .mockImplementation(() => jest.fn()); + markerClusterer["renderClusters"] = jest.fn(); + const cluster = new Cluster({ markers }); + cluster.marker = marker; + markerClusterer["clusters"] = [cluster]; + + MarkerUtils.setMap = jest.fn().mockImplementation(() => null); + + markerClusterer["render"](); + + expect(MarkerUtils.setMap).toHaveBeenCalledWith(marker, null); + }); + + test("markerClusterer render should remove all group cluster markers from the map", () => { + const markers: Marker[] = [new markerClass(), new markerClass()]; + const algorithm = { + calculate: jest.fn().mockReturnValue({ clusters: [], changed: true }), + }; + const markerClusterer = new MarkerClusterer({ + markers, + algorithm, + }); + markerClusterer.getMap = jest.fn().mockImplementation(() => map); + markerClusterer.getProjection = jest + .fn() + .mockImplementation(() => jest.fn()); + markerClusterer["renderClusters"] = jest.fn(); + const cluster = new Cluster({ markers }); + cluster.marker = new markerClass(); + markerClusterer["clusters"] = [cluster]; + + MarkerUtils.setMap = jest.fn().mockImplementation(() => null); + + markerClusterer["render"](); + + expect(MarkerUtils.setMap).toHaveBeenCalledWith(cluster.marker, null); + }); + test("markerClusterer renderClusters bypasses renderer if just one", () => { const markers: Marker[] = [new markerClass()]; @@ -174,6 +263,28 @@ describe.each(markerClasses)( ); }); + test("markerClusterer renderClusters remove all individual markers from the map", () => { + const marker1 = new markerClass(); + const marker2 = new markerClass(); + const markers: Marker[] = [marker1, marker2]; + + const markerClusterer = new MarkerClusterer({ + markers, + renderer, + }); + + MarkerUtils.setMap = jest.fn(); + markerClusterer.getMap = jest.fn().mockImplementation(() => map); + + const clusters = [new Cluster({ markers })]; + + markerClusterer["clusters"] = clusters; + markerClusterer["renderClusters"](); + + expect(MarkerUtils.setMap).toBeCalledWith(marker1, null); + expect(MarkerUtils.setMap).toBeCalledWith(marker2, null); + }); + test("markerClusterer renderClusters does not set click handler", () => { const markers: Marker[] = [new markerClass()]; diff --git a/src/markerclusterer.ts b/src/markerclusterer.ts index c20a2f7b..6da5eb2e 100644 --- a/src/markerclusterer.ts +++ b/src/markerclusterer.ts @@ -178,14 +178,44 @@ export class MarkerClusterer extends OverlayViewSafe { mapCanvasProjection: this.getProjection(), }); - // allow algorithms to return flag on whether the clusters/markers have changed + // Allow algorithms to return flag on whether the clusters/markers have changed. if (changed || changed == undefined) { - // reset visibility of markers and clusters - this.reset(); - // store new clusters - this.clusters = clusters; + // Accumulate the markers of the clusters composed of a single marker. + // Those clusters directly use the marker. + // Clusters with more than one markers use a group marker generated by a renderer. + const singleMarker = new Set(); + for (const cluster of clusters) { + if (cluster.markers.length == 1) { + singleMarker.add(cluster.markers[0]); + } + } + + const groupMarkers: Marker[] = []; + // Iterate the clusters that are currently rendered. + for (const cluster of this.clusters) { + if (cluster.marker == null) { + continue; + } + if (cluster.markers.length == 1) { + if (!singleMarker.has(cluster.marker)) { + // The marker: + // - was previously rendered because it is from a cluster with 1 marker, + // - should no more be rendered as it is not in singleMarker. + MarkerUtils.setMap(cluster.marker, null); + } + } else { + // Delay the removal of old group markers to avoid flickering. + groupMarkers.push(cluster.marker); + } + } + this.clusters = clusters; this.renderClusters(); + + // Delayed removal of the markers of the former groups. + requestAnimationFrame(() => + groupMarkers.forEach((marker) => MarkerUtils.setMap(marker, null)) + ); } google.maps.event.trigger( this, @@ -215,14 +245,18 @@ export class MarkerClusterer extends OverlayViewSafe { } protected renderClusters(): void { - // generate stats to pass to renderers + // Generate stats to pass to renderers. const stats = new ClusterStats(this.markers, this.clusters); const map = this.getMap() as google.maps.Map; + this.clusters.forEach((cluster) => { if (cluster.markers.length === 1) { cluster.marker = cluster.markers[0]; } else { + // Generate the marker to represent the group. cluster.marker = this.renderer.render(cluster, stats, map); + // Make sure all individual markers are removed from the map. + cluster.markers.forEach((marker) => MarkerUtils.setMap(marker, null)); if (this.onClusterClick) { cluster.marker.addListener( "click",