[Maps] show vector tile labels on top (elastic#69444) (elastic#70681)

* [Maps] show vector tile labels on top

* experiment with new sort algorithm

* clean up

* remove old sort method

* add unit test for sort layer

* tslint

* clean up

* make labelsOnTop configurable

* tslint

* more tslint

* add another test case for single layer move

* clarify should messages

* fix assert not null operators

* review feedback

* update snapshot

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

x-pack/plugins/maps/common/descriptor_types/sources.ts

@@ -169,6 +169,7 @@ export type LayerDescriptor = {
   alpha?: number;
   id: string;
   label?: string | null;
+  areLabelsOnTop?: boolean;
   minZoom?: number;
   maxZoom?: number;
   sourceDescriptor: SourceDescriptor | null;

x-pack/plugins/maps/public/actions/layer_actions.ts

@@ -319,6 +319,15 @@ export function updateLayerAlpha(id: string, alpha: number) {
   };
 }
 
+export function updateLabelsOnTop(id: string, areLabelsOnTop: boolean) {
+  return {
+    type: UPDATE_LAYER_PROP,
+    id,
+    propName: 'areLabelsOnTop',
+    newValue: areLabelsOnTop,
+  };
+}
+
 export function setLayerQuery(id: string, query: Query) {
   return (dispatch: Dispatch) => {
     dispatch({

x-pack/plugins/maps/public/classes/layers/layer.tsx

@@ -76,6 +76,8 @@ export interface ILayer {
   getPrevRequestToken(dataId: string): symbol | undefined;
   destroy: () => void;
   isPreviewLayer: () => boolean;
+  areLabelsOnTop: () => boolean;
+  supportsLabelsOnTop: () => boolean;
 }
 export type Footnote = {
   icon: ReactElement<any>;
@@ -483,4 +485,12 @@ export class AbstractLayer implements ILayer {
   getType(): string | undefined {
     return this._descriptor.type;
   }
+
+  areLabelsOnTop(): boolean {
+    return false;
+  }
+
+  supportsLabelsOnTop(): boolean {
+    return false;
+  }
 }

x-pack/plugins/maps/public/classes/layers/vector_tile_layer/vector_tile_layer.js

@@ -277,4 +277,12 @@ export class VectorTileLayer extends TileLayer {
       this._setOpacityForType(mbMap, mbLayer, mbLayerId);
     });
   }
+
+  areLabelsOnTop() {
+    return !!this._descriptor.areLabelsOnTop;
+  }
+
+  supportsLabelsOnTop() {
+    return true;
+  }
 }

x-pack/plugins/maps/public/connected_components/layer_panel/layer_settings/index.tsx

@@ -0,0 +1,30 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import { AnyAction, Dispatch } from 'redux';
+import { connect } from 'react-redux';
+import { LayerSettings } from './layer_settings';
+import {
+  updateLayerLabel,
+  updateLayerMaxZoom,
+  updateLayerMinZoom,
+  updateLayerAlpha,
+  updateLabelsOnTop,
+} from '../../../actions';
+
+function mapDispatchToProps(dispatch: Dispatch<AnyAction>) {
+  return {
+    updateLabel: (id: string, label: string) => dispatch(updateLayerLabel(id, label)),
+    updateMinZoom: (id: string, minZoom: number) => dispatch(updateLayerMinZoom(id, minZoom)),
+    updateMaxZoom: (id: string, maxZoom: number) => dispatch(updateLayerMaxZoom(id, maxZoom)),
+    updateAlpha: (id: string, alpha: number) => dispatch(updateLayerAlpha(id, alpha)),
+    updateLabelsOnTop: (id: string, areLabelsOnTop: boolean) =>
+      dispatch(updateLabelsOnTop(id, areLabelsOnTop)),
+  };
+}
+
+const connectedLayerSettings = connect(null, mapDispatchToProps)(LayerSettings);
+export { connectedLayerSettings as LayerSettings };

x-pack/plugins/maps/public/connected_components/layer_panel/layer_settings/layer_settings.tsx

@@ -0,0 +1,134 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import React, { ChangeEvent, Fragment } from 'react';
+import {
+  EuiTitle,
+  EuiPanel,
+  EuiFormRow,
+  EuiFieldText,
+  EuiSpacer,
+  EuiSwitch,
+  EuiSwitchEvent,
+} from '@elastic/eui';
+import { i18n } from '@kbn/i18n';
+import { FormattedMessage } from '@kbn/i18n/react';
+import { MAX_ZOOM } from '../../../../common/constants';
+import { AlphaSlider } from '../../../components/alpha_slider';
+import { ValidatedDualRange } from '../../../../../../../src/plugins/kibana_react/public';
+import { ILayer } from '../../../classes/layers/layer';
+
+interface Props {
+  layer: ILayer;
+  updateLabel: (layerId: string, label: string) => void;
+  updateMinZoom: (layerId: string, minZoom: number) => void;
+  updateMaxZoom: (layerId: string, maxZoom: number) => void;
+  updateAlpha: (layerId: string, alpha: number) => void;
+  updateLabelsOnTop: (layerId: string, areLabelsOnTop: boolean) => void;
+}
+
+export function LayerSettings(props: Props) {
+  const minVisibilityZoom = props.layer.getMinSourceZoom();
+  const maxVisibilityZoom = MAX_ZOOM;
+  const layerId = props.layer.getId();
+
+  const onLabelChange = (event: ChangeEvent<HTMLInputElement>) => {
+    const label = event.target.value;
+    props.updateLabel(layerId, label);
+  };
+
+  const onZoomChange = (value: [string, string]) => {
+    props.updateMinZoom(layerId, Math.max(minVisibilityZoom, parseInt(value[0], 10)));
+    props.updateMaxZoom(layerId, Math.min(maxVisibilityZoom, parseInt(value[1], 10)));
+  };
+
+  const onAlphaChange = (alpha: number) => {
+    props.updateAlpha(layerId, alpha);
+  };
+
+  const onLabelsOnTopChange = (event: EuiSwitchEvent) => {
+    props.updateLabelsOnTop(layerId, event.target.checked);
+  };
+
+  const renderZoomSliders = () => {
+    return (
+      <ValidatedDualRange
+        label={i18n.translate('xpack.maps.layerPanel.settingsPanel.visibleZoomLabel', {
+          defaultMessage: 'Visibility',
+        })}
+        formRowDisplay="columnCompressed"
+        min={minVisibilityZoom}
+        max={maxVisibilityZoom}
+        value={[props.layer.getMinZoom(), props.layer.getMaxZoom()]}
+        showInput="inputWithPopover"
+        showRange
+        showLabels
+        onChange={onZoomChange}
+        allowEmptyRange={false}
+        compressed
+        prepend={i18n.translate('xpack.maps.layerPanel.settingsPanel.visibleZoom', {
+          defaultMessage: 'Zoom levels',
+        })}
+      />
+    );
+  };
+
+  const renderLabel = () => {
+    return (
+      <EuiFormRow
+        label={i18n.translate('xpack.maps.layerPanel.settingsPanel.layerNameLabel', {
+          defaultMessage: 'Name',
+        })}
+        display="columnCompressed"
+      >
+        <EuiFieldText value={props.layer.getLabel()} onChange={onLabelChange} compressed />
+      </EuiFormRow>
+    );
+  };
+
+  const renderShowLabelsOnTop = () => {
+    if (!props.layer.supportsLabelsOnTop()) {
+      return null;
+    }
+
+    return (
+      <EuiFormRow display="columnCompressedSwitch">
+        <EuiSwitch
+          label={i18n.translate('xpack.maps.layerPanel.settingsPanel.labelsOnTop', {
+            defaultMessage: `Show labels on top`,
+          })}
+          checked={props.layer.areLabelsOnTop()}
+          onChange={onLabelsOnTopChange}
+          data-test-subj="mapLayerPanelApplyGlobalQueryCheckbox"
+          compressed
+        />
+      </EuiFormRow>
+    );
+  };
+
+  return (
+    <Fragment>
+      <EuiPanel>
+        <EuiTitle size="xs">
+          <h5>
+            <FormattedMessage
+              id="xpack.maps.layerPanel.layerSettingsTitle"
+              defaultMessage="Layer settings"
+            />
+          </h5>
+        </EuiTitle>
+
+        <EuiSpacer size="m" />
+        {renderLabel()}
+        {renderZoomSliders()}
+        <AlphaSlider alpha={props.layer.getAlpha()} onChange={onAlphaChange} />
+        {renderShowLabelsOnTop()}
+      </EuiPanel>
+
+      <EuiSpacer size="s" />
+    </Fragment>
+  );
+}

x-pack/plugins/maps/public/connected_components/layer_panel/view.js

@@ -205,7 +205,7 @@ export class LayerPanel extends React.Component {
             <div className="mapLayerPanel__bodyOverflow">
               <LayerErrors />
 
-              <LayerSettings />
+              <LayerSettings layer={selectedLayer} />
 
               {this.props.selectedLayer.renderSourceSettingsEditor({
                 onChange: this._onSourceChange,