3 files changed, 156 insertions, 15 deletions
diff --git a/modern/src/map/Map.js b/modern/src/map/Map.js
index 6cb3949b..2617b98d 100644
--- a/modern/src/map/Map.js
+++ b/modern/src/map/Map.js
@@ -1,9 +1,11 @@
 import 'mapbox-gl/dist/mapbox-gl.css';
+import './switcher/switcher.css';
 import mapboxgl from 'mapbox-gl';
+import { SwitcherControl } from './switcher/switcher';
 import React, { useRef, useLayoutEffect, useEffect, useState } from 'react';
 import { deviceCategories } from '../common/deviceCategories';
 import { loadIcon, loadImage } from './mapUtil';
-import { styleOsm } from './mapStyles';
+import { styleCarto, styleOsm } from './mapStyles';
 
 const element = document.createElement('div');
 element.style.width = '100%';
@@ -14,17 +16,17 @@ export const map = new mapboxgl.Map({
   style: styleOsm(),
 });
 
-map.addControl(new mapboxgl.NavigationControl());
+let ready = false;
+const readyListeners = new Set();
 
-let readyListeners = [];
+const addReadyListener = listener => readyListeners.add(listener);
 
-const onMapReady = listener => {
-  if (!readyListeners) {
-    listener();
-  } else {
-    readyListeners.push(listener);
-  }
-};
+const removeReadyListener = listener => readyListeners.delete(listener);
+
+const updateReadyValue = value => {
+  ready = value;
+  readyListeners.forEach(listener => listener(value));
+}
 
 map.on('load', async () => {
   const background = await loadImage('images/background.svg');
@@ -32,18 +34,38 @@ map.on('load', async () => {
     const imageData = await loadIcon(category, background, `images/icon/${category}.svg`);
     map.addImage(category, imageData, { pixelRatio: window.devicePixelRatio });
   }));
-  if (readyListeners) {
-    readyListeners.forEach(listener => listener());
-    readyListeners = null;
-  }
+  updateReadyValue(true);
 });
 
+map.addControl(new mapboxgl.NavigationControl({
+  showCompass: false,
+}));
+
+map.addControl(new SwitcherControl(
+  [{
+    title: "styleOsm",
+    uri: styleOsm(),
+  }, {
+    title: "styleCarto",
+    uri: styleCarto(),
+  }],
+  'styleOsm',
+  () => updateReadyValue(false),
+  () => updateReadyValue(true),
+));
+
 const Map = ({ children }) => {
   const containerEl = useRef(null);
 
   const [mapReady, setMapReady] = useState(false);
   
-  useEffect(() => onMapReady(() => setMapReady(true)), []);
+  useEffect(() => {
+    const listener = ready => setMapReady(ready);
+    addReadyListener(listener);
+    return () => {
+      removeReadyListener(listener);
+    };
+  }, []);
 
   useLayoutEffect(() => {
     const currentEl = containerEl.current;
diff --git a/modern/src/map/switcher/switcher.css b/modern/src/map/switcher/switcher.css
new file mode 100644
index 00000000..6c8fdb4e
--- /dev/null
+++ b/modern/src/map/switcher/switcher.css
@@ -0,0 +1,40 @@
+.mapboxgl-style-list
+{
+  display: none;
+}
+
+.mapboxgl-ctrl-group .mapboxgl-style-list button
+{
+  background: none;
+  border: none;
+  cursor: pointer;
+  display: block;
+  font-size: 14px;
+  padding: 8px 8px 6px;
+  text-align: right;
+  width: 100%;
+  height: auto;
+}
+
+.mapboxgl-style-list button.active
+{
+  font-weight: bold;
+}
+
+.mapboxgl-style-list button:hover
+{
+  background-color: rgba(0, 0, 0, 0.05);
+}
+
+.mapboxgl-style-list button + button
+{
+  border-top: 1px solid #ddd;
+}
+
+.mapboxgl-style-switcher
+{ 
+  background-image: url(data:image/svg+xml;base64,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);
+  background-position: center;
+  background-repeat: no-repeat;
+  background-size: 70%;
+}
diff --git a/modern/src/map/switcher/switcher.js b/modern/src/map/switcher/switcher.js
new file mode 100644
index 00000000..ff9fbe97
--- /dev/null
+++ b/modern/src/map/switcher/switcher.js
@@ -0,0 +1,79 @@
+export class SwitcherControl {
+
+  constructor(styles, defaultStyle, beforeSwitch, afterSwitch) {
+    this.styles = styles;
+    this.defaultStyle = defaultStyle;
+    this.beforeSwitch = beforeSwitch;
+    this.afterSwitch = afterSwitch;
+    this.onDocumentClick = this.onDocumentClick.bind(this);
+  }
+
+  getDefaultPosition() {
+    return 'top-right';
+  }
+
+  onAdd(map) {
+    this.map = map;
+    this.controlContainer = document.createElement('div');
+    this.controlContainer.classList.add('mapboxgl-ctrl');
+    this.controlContainer.classList.add('mapboxgl-ctrl-group');
+    this.mapStyleContainer = document.createElement('div');
+    this.styleButton = document.createElement('button');
+    this.styleButton.type = 'button';
+    this.mapStyleContainer.classList.add('mapboxgl-style-list');
+    for (const style of this.styles) {
+      const styleElement = document.createElement('button');
+      styleElement.type = 'button';
+      styleElement.innerText = style.title;
+      styleElement.classList.add(style.title.replace(/[^a-z0-9-]/gi, '_'));
+      styleElement.dataset.uri = JSON.stringify(style.uri);
+      styleElement.addEventListener('click', event => {
+        const srcElement = event.srcElement;
+        if (srcElement.classList.contains('active')) {
+          return;
+        }
+        this.beforeSwitch();
+        this.map.setStyle(JSON.parse(srcElement.dataset.uri));
+        this.afterSwitch();
+        this.mapStyleContainer.style.display = 'none';
+        this.styleButton.style.display = 'block';
+        const elms = this.mapStyleContainer.getElementsByClassName('active');
+        while (elms[0]) {
+          elms[0].classList.remove('active');
+        }
+        srcElement.classList.add('active');
+      });
+      if (style.title === this.defaultStyle) {
+        styleElement.classList.add('active');
+      }
+      this.mapStyleContainer.appendChild(styleElement);
+    }
+    this.styleButton.classList.add('mapboxgl-ctrl-icon');
+    this.styleButton.classList.add('mapboxgl-style-switcher');
+    this.styleButton.addEventListener('click', () => {
+      this.styleButton.style.display = 'none';
+      this.mapStyleContainer.style.display = 'block';
+    });
+    document.addEventListener('click', this.onDocumentClick);
+    this.controlContainer.appendChild(this.styleButton);
+    this.controlContainer.appendChild(this.mapStyleContainer);
+    return this.controlContainer;
+  }
+
+  onRemove() {
+    if (!this.controlContainer || !this.controlContainer.parentNode || !this.map || !this.styleButton) {
+      return;
+    }
+    this.styleButton.removeEventListener('click', this.onDocumentClick);
+    this.controlContainer.parentNode.removeChild(this.controlContainer);
+    document.removeEventListener('click', this.onDocumentClick);
+    this.map = undefined;
+  }
+
+  onDocumentClick(event) {
+    if (this.controlContainer && !this.controlContainer.contains(event.target) && this.mapStyleContainer && this.styleButton) {
+      this.mapStyleContainer.style.display = 'none';
+      this.styleButton.style.display = 'block';
+    }
+  }
+}