Refactor leaflet code for better loading

app/javascript/new_design/champs/carte.js

@@ -1,47 +1,38 @@
-import { initMap, drawPolygons, addFreeDrawEvents } from '../../shared/carte';
-
 async function initialize() {
   const elements = document.querySelectorAll('.carte');
 
   if (elements.length) {
-    const editable = [...elements].find(element =>
-      element.classList.contains('edit')
-    );
-    await loadLeaflet(editable);
-
     for (let element of elements) {
-      diplayMap(element, null, true);
+      loadAndDrawMap(element);
     }
   }
 }
 
-// We load leaflet dynamically, ramda and freedraw and assign them to globals.
+async function loadAndDrawMap(element) {
-// Latest freedraw version build needs globals.
+  const data = JSON.parse(element.dataset.geo);
-async function loadLeaflet(editable) {
+  const editable = element.classList.contains('edit');
-  window.L = await import('leaflet').then(({ default: L }) => L);
 
   if (editable) {
-    window.R = await import('ramda').then(({ default: R }) => R);
+    const { drawEditableMap } = await import('../../shared/carte-editor');
-    await import('leaflet-freedraw/dist/leaflet-freedraw.web.js');
+
+    drawEditableMap(element, data);
+  } else {
+    const { drawMap } = await import('../../shared/carte');
+
+    drawMap(element, data);
   }
 }
 
-function diplayMap(element, data, initial = false) {
+async function loadAndRedrawMap(element, data) {
-  data = data || JSON.parse(element.dataset.geo);
+  const { redrawMap } = await import('../../shared/carte-editor');
-  const editable = element.classList.contains('edit');
-  const map = initMap(element, data.position, editable);
 
-  drawPolygons(map, data, { initial, editable });
+  redrawMap(element, data);
-
-  if (initial && editable) {
-    const input = element.parentElement.querySelector('input[data-remote]');
-    addFreeDrawEvents(map, input);
-  }
 }
 
 addEventListener('turbolinks:load', initialize);
 
 addEventListener('carte:update', ({ detail: { selector, data } }) => {
   const element = document.querySelector(selector);
-  diplayMap(element, data);
+
+  loadAndRedrawMap(element, data);
 });

app/javascript/shared/carte-editor.js

@@ -0,0 +1,214 @@
+import L from 'leaflet';
+import FreeDraw from 'leaflet-freedraw';
+import { fire, delegate } from '@utils';
+import $ from 'jquery';
+
+import polygonArea from './polygon_area';
+
+const MAPS = new WeakMap();
+
+export function drawEditableMap(element, data) {
+  const map = initMap(element, data);
+
+  drawCadastre(map, data);
+  drawQuartiersPrioritaires(map, data);
+  drawParcellesAgricoles(map, data);
+
+  drawUserSelectionEditor(map, data);
+
+  const input = element.parentElement.querySelector('input[data-remote]');
+  addFreeDrawEvents(map, input);
+}
+
+export function redrawMap(element, data) {
+  const map = initMap(element, data);
+
+  clearLayers(map);
+
+  drawCadastre(map, data);
+  drawQuartiersPrioritaires(map, data);
+  drawParcellesAgricoles(map, data);
+
+  bringToFrontUserSelection(map);
+}
+
+function initMap(element, { position }) {
+  if (MAPS.has(element)) {
+    return MAPS.get(element);
+  } else {
+    const map = L.map(element, {
+      scrollWheelZoom: false
+    }).setView([position.lat, position.lon], 18);
+
+    const loadTilesLayer = process.env.RAILS_ENV != 'test';
+    if (loadTilesLayer) {
+      L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
+        attribution:
+          '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
+      }).addTo(map);
+    }
+
+    const freeDraw = new FreeDraw({
+      mode: FreeDraw.NONE,
+      smoothFactor: 4,
+      mergePolygons: false
+    });
+    map.addLayer(freeDraw);
+    map.freeDraw = freeDraw;
+
+    MAPS.set(element, map);
+    return map;
+  }
+}
+
+function toLatLngs({ coordinates }) {
+  return coordinates.map(polygon =>
+    polygon[0].map(point => L.GeoJSON.coordsToLatLng(point))
+  );
+}
+
+function drawUserSelectionEditor(map, { selection }) {
+  if (selection) {
+    const geoJSON = L.geoJSON(selection);
+
+    for (let polygon of toLatLngs(selection)) {
+      map.freeDraw.create(polygon);
+    }
+
+    map.fitBounds(geoJSON.getBounds());
+  }
+}
+
+export function addFreeDrawEvents(map, selector) {
+  const input = findInput(selector);
+  map.freeDraw.on('markers', ({ latLngs }) => {
+    if (latLngs.length === 0) {
+      input.value = EMPTY_GEO_JSON;
+    } else if (polygonArea(latLngs) < 300000) {
+      input.value = JSON.stringify(latLngs);
+    } else {
+      input.value = ERROR_GEO_JSON;
+    }
+
+    fire(input, 'change');
+  });
+}
+
+function drawCadastre(map, { cadastres }) {
+  drawLayer(map, cadastres, CADASTRE_POLYGON_STYLE);
+}
+
+function drawQuartiersPrioritaires(map, { quartiersPrioritaires }) {
+  drawLayer(map, quartiersPrioritaires, QP_POLYGON_STYLE);
+}
+
+function drawParcellesAgricoles(map, { parcellesAgricoles }) {
+  drawLayer(map, parcellesAgricoles, RPG_POLYGON_STYLE);
+}
+
+function getCurrentMap(element) {
+  if (!element.matches('.carte')) {
+    const closestCarteElement = element.closest('.carte');
+    const closestToolbarElement = element.closest('.toolbar');
+
+    element = closestCarteElement
+      ? closestCarteElement
+      : closestToolbarElement.parentElement.querySelector('.carte');
+  }
+
+  if (MAPS.has(element)) {
+    return MAPS.get(element);
+  }
+}
+
+const EMPTY_GEO_JSON = '[]';
+const ERROR_GEO_JSON = '';
+
+function findInput(selector) {
+  return typeof selector === 'string'
+    ? document.querySelector(selector)
+    : selector;
+}
+
+function clearLayers(map) {
+  map.eachLayer(layer => {
+    if (layer instanceof L.GeoJSON) {
+      map.removeLayer(layer);
+    }
+  });
+}
+
+function bringToFrontUserSelection(map) {
+  for (let layer of map.freeDraw.all()) {
+    layer.bringToFront();
+  }
+}
+
+function drawLayer(map, data, style) {
+  if (Array.isArray(data) && data.length > 0) {
+    const layer = new L.GeoJSON(undefined, {
+      interactive: false,
+      style
+    });
+
+    for (let { geometry } of data) {
+      layer.addData(geometry);
+    }
+
+    layer.addTo(map);
+  }
+}
+
+const POLYGON_STYLE = {
+  weight: 2,
+  opacity: 0.3,
+  color: 'white',
+  dashArray: '3',
+  fillOpacity: 0.7
+};
+
+const CADASTRE_POLYGON_STYLE = Object.assign({}, POLYGON_STYLE, {
+  fillColor: '#8a6d3b'
+});
+
+const QP_POLYGON_STYLE = Object.assign({}, POLYGON_STYLE, {
+  fillColor: '#31708f'
+});
+
+const RPG_POLYGON_STYLE = Object.assign({}, POLYGON_STYLE, {
+  fillColor: '#31708f'
+});
+
+delegate('click', '.carte.edit', event => {
+  const map = getCurrentMap(event.target);
+
+  if (map) {
+    const isPath = event.target.matches('.leaflet-container g path');
+    if (isPath) {
+      setTimeout(() => {
+        map.freeDraw.mode(FreeDraw.EDIT | FreeDraw.DELETE);
+      }, 50);
+    } else {
+      map.freeDraw.mode(FreeDraw.NONE);
+    }
+  }
+});
+
+delegate('click', '.toolbar .new-area', event => {
+  event.preventDefault();
+  const map = getCurrentMap(event.target);
+
+  if (map) {
+    map.freeDraw.mode(FreeDraw.CREATE);
+  }
+});
+
+$(document).on('select2:select', 'select[data-address]', event => {
+  const map = getCurrentMap(event.target);
+  const { geometry } = event.params.data;
+
+  if (map && geometry && geometry.type === 'Point') {
+    const [lon, lat] = geometry.coordinates;
+    map.setView(new L.LatLng(lat, lon), 14);
+  }
+});

app/javascript/shared/carte.js

@@ -1,18 +1,23 @@
-/* globals FreeDraw L */
+import L from 'leaflet';
-import { fire, delegate } from '@utils';
-import $ from 'jquery';
-
-import polygonArea from './polygon_area';
 
 const MAPS = new WeakMap();
 
-export function initMap(element, position, editable = false) {
+export function drawMap(element, data) {
+  const map = initMap(element, data);
+
+  drawCadastre(map, data);
+  drawQuartiersPrioritaires(map, data);
+  drawParcellesAgricoles(map, data);
+  drawUserSelection(map, data);
+}
+
+function initMap(element, { position }) {
   if (MAPS.has(element)) {
     return MAPS.get(element);
   } else {
     const map = L.map(element, {
       scrollWheelZoom: false
-    }).setView([position.lat, position.lon], editable ? 18 : position.zoom);
+    }).setView([position.lat, position.lon], position.zoom);
 
     const loadTilesLayer = process.env.RAILS_ENV != 'test';
     if (loadTilesLayer) {
@@ -22,168 +27,47 @@ export function initMap(element, position, editable = false) {
       }).addTo(map);
     }
 
-    if (editable) {
-      const freeDraw = new FreeDraw({
-        mode: FreeDraw.NONE,
-        smoothFactor: 4,
-        mergePolygons: false
-      });
-      map.addLayer(freeDraw);
-      map.freeDraw = freeDraw;
-    }
-
     MAPS.set(element, map);
     return map;
   }
 }
 
-export function drawPolygons(map, data, { editable, initial }) {
+function drawUserSelection(map, { selection }) {
-  if (initial) {
-    drawUserSelection(map, data, editable);
-  }
-  clearLayers(map);
-  drawCadastre(map, data, editable);
-  drawQuartiersPrioritaires(map, data, editable);
-  drawParcellesAgricoles(map, data, editable);
-  bringToFrontUserSelection(map);
-}
-
-export function drawUserSelection(map, { selection }, editable = false) {
   if (selection) {
-    const coordinates = toLatLngs(selection);
+    const layer = L.geoJSON(selection, {
-    let polygon;
+      style: USER_SELECTION_POLYGON_STYLE
+    });
 
-    if (editable) {
+    layer.addTo(map);
-      coordinates.forEach(polygon => map.freeDraw.create(polygon));
-      [polygon] = markFreeDrawLayers(map);
-    } else {
-      polygon = L.polygon(coordinates, {
-        color: 'red',
-        zIndex: 3
-      });
-      polygon.addTo(map);
-    }
 
-    if (polygon) {
+    map.fitBounds(layer.getBounds());
-      map.fitBounds(polygon.getBounds());
-    }
   }
 }
 
-export function addFreeDrawEvents(map, selector) {
+function drawCadastre(map, { cadastres }) {
-  const input = findInput(selector);
+  drawLayer(map, cadastres, noEditStyle(CADASTRE_POLYGON_STYLE));
-  map.freeDraw.on('markers', ({ latLngs }) => {
-    if (latLngs.length === 0) {
-      input.value = EMPTY_GEO_JSON;
-    } else if (polygonArea(latLngs) < 300000) {
-      input.value = JSON.stringify(latLngs);
-    } else {
-      input.value = ERROR_GEO_JSON;
-    }
-
-    markFreeDrawLayers(map);
-    fire(input, 'change');
-  });
 }
 
-function drawCadastre(map, { cadastres }, editable = false) {
+function drawQuartiersPrioritaires(map, { quartiersPrioritaires }) {
-  drawLayer(
+  drawLayer(map, quartiersPrioritaires, noEditStyle(QP_POLYGON_STYLE));
-    map,
-    cadastres,
-    editable ? CADASTRE_POLYGON_STYLE : noEditStyle(CADASTRE_POLYGON_STYLE)
-  );
 }
 
-function drawQuartiersPrioritaires(
+function drawParcellesAgricoles(map, { parcellesAgricoles }) {
-  map,
+  drawLayer(map, parcellesAgricoles, noEditStyle(RPG_POLYGON_STYLE));
-  { quartiersPrioritaires },
-  editable = false
-) {
-  drawLayer(
-    map,
-    quartiersPrioritaires,
-    editable ? QP_POLYGON_STYLE : noEditStyle(QP_POLYGON_STYLE)
-  );
-}
-
-function drawParcellesAgricoles(map, { parcellesAgricoles }, editable = false) {
-  drawLayer(
-    map,
-    parcellesAgricoles,
-    editable ? RPG_POLYGON_STYLE : noEditStyle(RPG_POLYGON_STYLE)
-  );
-}
-
-function getCurrentMap(element) {
-  if (!element.matches('.carte')) {
-    const closestCarteElement = element.closest('.carte');
-    const closestToolbarElement = element.closest('.toolbar');
-
-    element = closestCarteElement
-      ? closestCarteElement
-      : closestToolbarElement.parentElement.querySelector('.carte');
-  }
-
-  if (MAPS.has(element)) {
-    return MAPS.get(element);
-  }
-}
-
-const EMPTY_GEO_JSON = '[]';
-const ERROR_GEO_JSON = '';
-
-function toLatLngs({ coordinates }) {
-  return coordinates.map(polygon =>
-    polygon[0].map(point => ({ lng: point[0], lat: point[1] }))
-  );
-}
-
-function findInput(selector) {
-  return typeof selector === 'string'
-    ? document.querySelector(selector)
-    : selector;
-}
-
-function createLayer(map) {
-  const layer = new L.GeoJSON(undefined, {
-    interactive: false
-  });
-  layer.addTo(map);
-  return layer;
-}
-
-function clearLayers(map) {
-  map.eachLayer(layer => {
-    if (layer instanceof L.GeoJSON) {
-      map.removeLayer(layer);
-    }
-  });
-}
-
-function bringToFrontUserSelection(map) {
-  map.eachLayer(layer => {
-    if (layer.isFreeDraw) {
-      layer.bringToFront();
-    }
-  });
-}
-
-function markFreeDrawLayers(map) {
-  return map.freeDraw.all().map(layer => {
-    layer.isFreeDraw = true;
-    return layer;
-  });
 }
 
 function drawLayer(map, data, style) {
   if (Array.isArray(data) && data.length > 0) {
-    const layer = createLayer(map);
+    const layer = new L.GeoJSON(undefined, {
-
+      interactive: false,
-    data.forEach(function(item) {
+      style
-      layer.addData(item.geometry);
     });
 
-    layer.setStyle(style).addTo(map);
+    for (let { geometry } of data) {
+      layer.addData(geometry);
+    }
+
+    layer.addTo(map);
   }
 }
 
@@ -215,36 +99,6 @@ const RPG_POLYGON_STYLE = Object.assign({}, POLYGON_STYLE, {
   fillColor: '#31708f'
 });
 
-delegate('click', '.carte.edit', event => {
+const USER_SELECTION_POLYGON_STYLE = {
-  const map = getCurrentMap(event.target);
+  color: 'red'
-
+};
-  if (map) {
-    const isPath = event.target.matches('.leaflet-container g path');
-    if (isPath) {
-      setTimeout(() => {
-        map.freeDraw.mode(FreeDraw.EDIT | FreeDraw.DELETE);
-      }, 50);
-    } else {
-      map.freeDraw.mode(FreeDraw.NONE);
-    }
-  }
-});
-
-delegate('click', '.toolbar .new-area', event => {
-  event.preventDefault();
-  const map = getCurrentMap(event.target);
-
-  if (map) {
-    map.freeDraw.mode(FreeDraw.CREATE);
-  }
-});
-
-$(document).on('select2:select', 'select[data-address]', event => {
-  const map = getCurrentMap(event.target);
-  const { geometry } = event.params.data;
-
-  if (map && geometry && geometry.type === 'Point') {
-    const [lon, lat] = geometry.coordinates;
-    map.setView(new L.LatLng(lat, lon), 14);
-  }
-});

package.json

@@ -20,10 +20,9 @@
     "highcharts": "^6.1.2",
     "intersection-observer": "^0.7.0",
     "jquery": "^3.4.1",
-    "leaflet": "^1.4.0",
+    "leaflet": "^1.6.0",
-    "leaflet-freedraw": "^2.10.0",
+    "leaflet-freedraw": "^2.12.0",
     "prop-types": "^15.7.2",
-    "ramda": "=0.24.1",
     "react": "^16.12.0",
     "react-dom": "^16.12.0",
     "react-intersection-observer": "^8.25.2",