Fixing invariant hook errors while rendering markers in OSM

src/app/components/MapMarker.js

@@ -1,76 +1,15 @@
-import React, { useState } from "react";
-import { View, StyleSheet, Image } from "react-native";
-import MapView from "react-native-maps";
-import colors from "../config/colors";
-import { dimensions } from "../config/dimensions";
+import React, { useState, useEffect } from "react";
+import { View } from "react-native";
 import MapModal from "./MapModal";
 
-const imageScale = 0.025;
-const markerSizeWidth = Math.floor(1667 * imageScale);
-const markerSizeHeigth = Math.floor(2501 * imageScale);
-
-export default function MapMarker(props) {
-  const [isModalVisible, setIsModalVisible] = useState(false);
-
+export default function MapMarker(markerListener, setMarkerListener, markers) {
   return (
-    <MapView.Marker
-      coordinate={props.coordinate}
-      onPress={() => setIsModalVisible(!isModalVisible)}
-    >
-      <View>
-        <Image
-          style={styles.markerPoint}
-          resizeMode="stretch"
-          source={props.image}
-        />
-
-        <MapModal
-          isVisible={isModalVisible}
-          setIsVisible={setIsModalVisible}
-          {...props}
-        />
-      </View>
-    </MapView.Marker>
+    <View>
+      <MapModal
+        markerToRender={}
+        setMarkerToRender={setIsModalVisible}
+        markers={markers}
+      />
+    </View>
   );
 }
-
-const styles = StyleSheet.create({
-  title: {
-    fontWeight: "bold",
-    fontSize: dimensions.text.secondary,
-    alignSelf: "center",
-    paddingBottom: dimensions.spacing.minimal_padding,
-  },
-  description: {
-    fontSize: dimensions.text.default,
-  },
-  arrow: {
-    alignSelf: "center",
-    borderTopWidth: 15,
-    borderRightWidth: 10,
-    borderBottomWidth: 0,
-    borderLeftWidth: 10,
-    borderTopColor: colors.lightGray,
-    borderRightColor: "transparent",
-    borderBottomColor: "transparent",
-    borderLeftColor: "transparent",
-    paddingBottom: 5,
-  },
-
-  container: {
-    flexDirection: "column",
-    alignSelf: "center",
-    backgroundColor: colors.lightestGray,
-    borderColor: colors.lightGray,
-    borderRadius: 6,
-    borderWidth: 4,
-    borderTopWidth: 2,
-    padding: dimensions.spacing.minimal_padding,
-    width: 200,
-  },
-  markerPoint: {
-    alignSelf: "center",
-    height: markerSizeHeigth,
-    width: markerSizeWidth,
-  },
-});

src/app/components/MapMarkerList.js

@@ -1,6 +1,4 @@
-import React from "react";
 import useMarkers from "../hooks/selectFromDB";
-import MapMarker from "../components/MapMarker";
 
 function isRequestedValue(
   item,
@@ -28,25 +26,21 @@ function MapMarkerList({
   renderOfficialPluviometer = true,
 }) {
   const markers = useMarkers(reload);
-  console.log(markers.markers.size);
-  return (
-    <>
-      {[...markers.markers]
-        .filter((item) =>
-          isRequestedValue(
-            item,
-            renderRain,
-            renderFlood,
-            renderRiver,
-            renderPluviometer,
-            renderOfficialPluviometer
-          )
-        )
-        .map(({ ID, ...val }) => {
-          return <MapMarker key={ID.toString()} {...val} />;
-        })}
-    </>
-  );
+  
+  // FIXME: Resolve this later!!!
+  return markers.markers;
+
+  // return [...markers.markers].filter(([k, item]) => {
+  //   isRequestedValue(
+  //     item,
+  //     renderRain,
+  //     renderFlood,
+  //     renderRiver,
+  //     renderPluviometer,
+  //     renderOfficialPluviometer
+  //   )
+  // }
+  // );
 }
 
 export { MapMarkerList };

src/app/components/MapModal.js

@@ -24,7 +24,7 @@ function notImplemented() {
   });
 }
 
-function topBar(props) {
+function topBar(setMarkerToRender) {
   return (
     <View style={styles.topBar}>
       <TouchableOpacity
@@ -53,7 +53,7 @@ function topBar(props) {
 
       <TouchableOpacity
         style={styles.topBarIcon}
-        onPress={() => props.setIsVisible(!props.isVisible)}
+        onPress={() => setMarkerToRender(null)}
       >
         <MaterialCommunityIcons
           name="close"
@@ -205,20 +205,29 @@ function isPluviometer(name) {
   return name === "pluviometer" || name === "officialPluviometer";
 }
 
-function MapModal(props) {
+function MapModal({markerToRender, setMarkerToRender, markers}) {
+  var currentMarker = undefined;
+  if (markers && markerToRender != null && markers.has(markerToRender)) {
+    currentMarker = markers.get(markerToRender);
+  }
+
+  if (currentMarker != undefined && markerToRender != null) {
   return (
     <SelfClosingModal
       animationType="slide"
       transparent={true}
-      visible={props.isVisible}
-      setVisible={props.setIsVisible}
+      markerToRender={markerToRender}
+      setMarkerToRender={setMarkerToRender}
     >
-      {topBar(props)}
-      {componentBody(props)}
-      {isPluviometer(props.name) ? moreInfo(props) : null}
-      {!isPluviometer(props.name) ? reviews(props) : null}
+      {topBar(setMarkerToRender)}
+      {componentBody(currentMarker)}
+      {isPluviometer(currentMarker.name) ? moreInfo(currentMarker) : null}
+      {!isPluviometer(currentMarker.name) ? reviews(currentMarker) : null}
     </SelfClosingModal>
-  );
+  );}
+  else {
+    return null;
+  }
 }
 
 const styles = StyleSheet.create({

src/app/components/SelfClosingModal.js

@@ -8,15 +8,16 @@ import {
 import { screen_height, screen_width } from "../config/dimensions";
 
 export default function SelfClosingModal(props) {
+
   return (
     <View style={styles.centeredView}>
       <Modal
         animationType={props.animationType}
         transparent={props.transparent}
-        visible={props.visible}
+        visible={props.markerToRender != null}
       >
         <TouchableWithoutFeedback
-          onPress={() => props.setVisible(!props.visible)}
+          onPress={() => props.setMarkerToRender(null)}
         >
           <View style={styles.modalOverlay} />
         </TouchableWithoutFeedback>

src/app/components/map/LeafLetMap.js

@@ -56,12 +56,12 @@ function handleEvent(event) {
   return code_to_function[payload.code](payload);
 }
 
-async function insertMarker(mapRef, ID, cords, icon) {
-  var iconSvg = icon;
+async function insertMarker(mapRef, ID, coordinate, icon) {
+  var iconSvg = `<svg height="100" width="100"> <circle cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" /> </svg>`;
 
-  if (typeof icon !== 'string' && !(icon instanceof String)) {
-    iconSvg = await loadLocalAsset(icon);
-  }
+  // if (typeof icon !== 'string' && !(icon instanceof String)) {
+  //   iconSvg = await loadLocalAsset(icon);
+  // }
 
   mapRef.injectJavaScript(`
   var customIcon = L.divIcon({
@@ -73,7 +73,7 @@ async function insertMarker(mapRef, ID, cords, icon) {
   // Check if there is no other marker with same ID already in map
   if (!(${ID} in markers)) {
     // Creates marker object
-    markers[${ID}] = L.marker([${cords.lat}, ${cords.long}], {icon: customIcon, ID: ${ID}});
+    markers[${ID}] = L.marker([${coordinate.latitude}, ${coordinate.longitude}], {icon: customIcon, ID: ${ID}});
 
     // Add marker to map and bing callback event to its function
     markers[${ID}].addTo(map).on('click', onPopupClick);

src/app/components/map/OpenStreetMap.js

@@ -1,5 +1,5 @@
-import React, { useState } from "react";
-import { View } from "react-native";
+import React, { useState, useEffect } from "react";
+import { View, StyleSheet, Text } from "react-native";
 import WebView from "react-native-webview";
 import {
   loadHTMLFile,
@@ -7,14 +7,20 @@ import {
   insertMarker,
   goToRegion,
 } from "./LeafLetMap";
+import MapModal from "../MapModal";
 
-function bindEventsToListeners(event, clickListener, markerListener, moveEndListener) {
+function bindEventsToListeners(
+  event,
+  clickListener,
+  setMarkerListener,
+  moveEndListener
+) {
   switch (event.object) {
     case "click":
       clickListener && clickListener(event.cords);
       break;
     case "marker":
-      markerListener && markerListener(event.id);
+      setMarkerListener(event.id);
       break;
     case "moveend":
       moveEndListener && moveEndListener(event.id);
@@ -24,25 +30,29 @@ function bindEventsToListeners(event, clickListener, markerListener, moveEndList
   }
 }
 
+function notEmpy(lista) {
+  return lista && lista.size > 0;
+}
+
 export default function OpenStreetMap({
   markersList,
   animateToPosition,
   clickListener,
-  markerListener,
   moveEndListener,
 }) {
   const [mapRef, setMapRef] = useState(null);
   const [webviewContent, setWebviewContent] = useState(null);
+  const [markerListener, setMarkerListener] = useState(null);
 
   if (mapRef != null) {
     animateToPosition != null && goToRegion(mapRef, animateToPosition);
-
-    markersList != null &&
-      markersList.length > 0 &&
-      markersList.map(({ ID, cords, icon }) =>
-        insertMarker(mapRef, ID, cords, icon)
-      );
   }
+  markersList &&
+    mapRef &&
+    notEmpy(markersList) &&
+    markersList.forEach((val, key) => {
+      insertMarker(mapRef, val.ID, val.coordinate, val.icon);
+    });
 
   loadHTMLFile()
     .then((html) => setWebviewContent(html))
@@ -58,13 +68,39 @@ export default function OpenStreetMap({
           bindEventsToListeners(
             handleEvent(event),
             clickListener,
-            markerListener,
-            moveEndListener,
+            setMarkerListener,
+            moveEndListener
           );
         }}
         javaScriptEnabled={true}
         source={{ html: webviewContent }}
       />
+      <View>
+      <MapModal
+        markerToRender={markerListener}
+        setMarkerToRender={setMarkerListener}
+        markers={markersList}
+      />
+        </View>
+
+      <View style={styles.callback}>
+        <Text style={styles.txt}>{markerListener}</Text>
+      </View>
     </View>
   );
 }
+
+const styles = StyleSheet.create({
+  callback: {
+    position: "absolute",
+    top: 30,
+    alignSelf: "center",
+    alignItems: "center",
+    backgroundColor: "gray",
+    width: "80%",
+    padding: 10,
+  },
+  txt: {
+    color: "white",
+  },
+});

src/app/hooks/selectFromDB.js

@@ -194,21 +194,22 @@ function genericSelect(queriesToParsersMapper, dispatch, isFocused) {
   }, [isFocused]);
 }
 
-const initialState = { markers: new Set() };
+const initialState = { markers: new Map() };
 
 function reducer(state = initialState, action) {
   // NOTE: removing old pluviometer value to new data can be displayed
-  state.markers.forEach((m) => {
+  state.markers.forEach((m, key) => {
     if (m.name == "pluviometer" || m.name == "officialPluviometer") {
-      state.markers.delete(m);
+      state.markers.delete(key);
     }
   });
 
   action.increment.map((val) => {
-    state.markers.add(val);
+    if (!state.markers.has(val.ID)) {
+      state.markers.set(val.ID, val);
+    }
   });
 
-  console.log(state.markers);
   return {
     markers: state.markers,
   };
@@ -278,67 +279,67 @@ function useMarkers(isFocused) {
   const location = context.currentCoordinates;
   const addr = context.currentLocation;
 
-  const parseOfficialPluviometers = () => {
-    return buildRandonData(location, addr);
-  };
-
-  const parsePluviometer = (db_result) => {
-    // if (db_result.rows.length <= 0) return [];
-    const points = [];
-
-    const info = {
-      pictures: "[]",
-      description: "",
-      date: "",
-    };
-
-    for (let i = 0; i < db_result.rows.length; ++i) {
-      var row = db_result.rows.item(i);
-
-      description = row["Description"] ? "\n\n" + row["Description"] : "";
-      info.date = row["Date"];
-      info.description =
-        row["Precipitation"] + "mm" + ",  " + row["Date"] + description;
-      info.pictures = row["Images"];
-
-      points.push([row["Date"].slice(0, 5), parseInt(row["Precipitation"])]);
-    }
-
-    latestPoints = points.sort(compare).slice(-7);
-    if (latestPoints.length == 0) {
-      var labels = [];
-      var values = [];
-    }
-    var labels = latestPoints.map((i) => {
-      return i[0];
-    });
-    var values = latestPoints.map((i) => {
-      return i[1];
-    });
-
-    const result = {
-      image: custom_assets_pin.pluviometer,
-      logo: custom_assets.pluviometer,
-      ID: ++ID,
-      name: "pluviometer",
-      title: "Pluviometro 1",
-      coordinate: location,
-      address: addr,
-      data: {
-        labels: labels,
-        values: values,
-      },
-      ...info,
-    };
-
-    return [result, ...parseOfficialPluviometers()];
-  };
+  // const parseOfficialPluviometers = () => {
+  //   return buildRandonData(location, addr);
+  // };
+
+  // const parsePluviometer = (db_result) => {
+  //   // if (db_result.rows.length <= 0) return [];
+  //   const points = [];
+
+  //   const info = {
+  //     pictures: "[]",
+  //     description: "",
+  //     date: "",
+  //   };
+
+  //   for (let i = 0; i < db_result.rows.length; ++i) {
+  //     var row = db_result.rows.item(i);
+
+  //     description = row["Description"] ? "\n\n" + row["Description"] : "";
+  //     info.date = row["Date"];
+  //     info.description =
+  //       row["Precipitation"] + "mm" + ",  " + row["Date"] + description;
+  //     info.pictures = row["Images"];
+
+  //     points.push([row["Date"].slice(0, 5), parseInt(row["Precipitation"])]);
+  //   }
+
+  //   latestPoints = points.sort(compare).slice(-7);
+  //   if (latestPoints.length == 0) {
+  //     var labels = [];
+  //     var values = [];
+  //   }
+  //   var labels = latestPoints.map((i) => {
+  //     return i[0];
+  //   });
+  //   var values = latestPoints.map((i) => {
+  //     return i[1];
+  //   });
+
+  //   const result = {
+  //     image: custom_assets_pin.pluviometer,
+  //     logo: custom_assets.pluviometer,
+  //     ID: ++ID,
+  //     name: "pluviometer",
+  //     title: "Pluviometro 1",
+  //     coordinate: location,
+  //     address: addr,
+  //     data: {
+  //       labels: labels,
+  //       values: values,
+  //     },
+  //     ...info,
+  //   };
+
+  //   return [result, ...parseOfficialPluviometers()];
+  // };
 
   const queriesToParsersMapper = [
     ["SELECT * FROM FloodZones;", parseFloodZones, false],
     ["SELECT * FROM RiverLevel;", parseRiverLevel, false],
     ["SELECT * FROM RainLevel;", parseRainLevel, false],
-    ["SELECT * FROM PluviometerData;", parsePluviometer, true],
+    // ["SELECT * FROM PluviometerData;", parsePluviometer, true],
   ];
 
   genericSelect(queriesToParsersMapper, dispatch, isFocused);

src/app/screens/MapFeedScreen.js

@@ -1,15 +1,17 @@
 import React, { useState, useEffect, useContext } from "react";
-import { StyleSheet, Text, TouchableOpacity, View } from "react-native";
+import { StyleSheet, Text, View } from "react-native";
 import OpenStreetMap from "../components/map/OpenStreetMap";
 import { CurrentLocationContext } from "../context/CurrentLocationContext";
+import attachFocusToQuery from "../hooks/useFocus";
+import {MapMarkerList} from "../components/MapMarkerList";
 
 export default function MapFeedScreen() {
   const [position, setPosition] = useState(null);
-  const [clickListener, setClickListener] = useState("");
-  const [markerListener, setMarkerListener] = useState("");
 
   const context = useContext(CurrentLocationContext);
   const location = context.currentCoordinates;
+  const focusChanged = attachFocusToQuery();
+
 
   useEffect(() => {
     setPosition({
@@ -23,15 +25,10 @@ export default function MapFeedScreen() {
   return (
     <View style={styles.container}>
       <OpenStreetMap
+        markersList={MapMarkerList({reload:focusChanged, renderRain:true})}
         animateToPosition={position}
-        clickListener={setClickListener}
-        markerListener={setMarkerListener}
       />
 
-      <View style={styles.callback}>
-        <Text style={styles.txt}>{JSON.stringify(clickListener)}</Text>
-        <Text style={styles.txt}>{JSON.stringify(markerListener)}</Text>
-      </View>
     </View>
   );
 }