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<!DOCTYPE html>
<html>
<head>
<title>App Inventor - Map Component</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<style>
html, body, #map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
<script>
/**
* This map script is an abstraction of a number of functions from the Google maps
* JavaScript API to be used within a customized WebView as an App Inventor Component.
*
* It contains two main objects: thisMap and mapMarkers.
* thisMap initializes the map and makes use of mapMarkers, which simply encapsulates all
* functions related to markers placed in the map. It is possible to create other utility
* objects with other functionality in the SDK such as drawing, layers, or services.
*/
/**
* This function returns an object with certain methods exposed as its API. The functionality
* of this object is related to management of markers in the map.
* @returns an Object with methods related to Marker management.
* @param mapComponent the map to associate the markers with.
*/
var mapMarkers = function(mapComponent) {
if (!mapComponent) throw new Error('No map available');
function AIMarker(marker){
if (marker instanceof google.maps.Marker){
this.marker = marker;
this.id = marker.getPosition().toString(); //Use position as unique id
}
else {
console.log('Calling Error handler on Android side - Invalid Marker');
androidObject.dispatchErrorToAndroid(androidObject.ERROR_INVALID_MARKER);
}
}
AIMarker.prototype.equals = function(otherMarker){
if (otherMarker == null) return false;
if (otherMarker instanceof AIMarker){
//Equality is based on position - two markers on the same position are the same marker
return this.marker.getPosition().toString() ===
otherMarker.marker.getPosition().toString();
}
return false;
}
var aiMarkers = {};
/**
* Add a marker, with additional information, to the map.
* @param location {google.maps.LatLng} object specifying the position in the map
* @param infoWindowContent content to be displayed in this marker infoWindow
* @param title a title for the marker (shown on hover in browsers)
*/
var addAIMarker = function(location, title, infoWindowContent){
var newAiMarker, marker;
if (location instanceof google.maps.LatLng){
newAiMarker = aiMarkers[location.toString()];
if (newAiMarker) { //If it exists, there's no need to create it
marker = newAiMarker.marker;
// We override values even if they are not different - it's easier.
marker.title = title;
if (infoWindowContent && marker.info){
marker.info.setContent(infoWindowContent);
}
}
else {
marker = new google.maps.Marker({
position: location,
title: title || '',
map: mapComponent
});
newAiMarker = new AIMarker(marker);
var theId = newAiMarker.id;
google.maps.event.addListener(marker, 'click', markerClicked(theId));
google.maps.event.addListener(marker, 'dblclick', markerClicked(theId, true));
aiMarkers[marker.getPosition().toString()] = newAiMarker;
if (infoWindowContent) {
createInfoWindow(theId, infoWindowContent);
}
}
}
else {
console.log('Calling Error handler on Android side');
androidObject.dispatchErrorToAndroid(androidObject.ERROR_ILLEGAL_COORDS_FORMAT);
}
return newAiMarker;
};
// Closure needed to associate each markerId with its click handler function
function markerClicked(markerId, doubleClick) {
return function(){
handleMarkerById(markerId, doubleClick);
}
}
function handleMarkerById(markerId, doubleClick) {
var markerJson = createJsonMarkerFromId(markerId);
if (doubleClick)
androidObject.sendDoubleMarkerToAndroid(markerJson);
else{
androidObject.sendMarkerToAndroid(markerJson);
}
}
function createJsonMarkerFromId(markerId){
var currentAiMarker = aiMarkers[markerId];
var markerObject = {
lat: currentAiMarker.marker.getPosition().lat(),
lng: currentAiMarker.marker.getPosition().lng(),
title: currentAiMarker.marker.title || '',
info: (currentAiMarker.marker.info && currentAiMarker.marker.info.content) ?
currentAiMarker.marker.info.content : ''
}
var markerJson = JSON.stringify(markerObject);
return markerJson;
}
var panToMarker = function(markerId) {
var markerToPanTo = aiMarkers[markerId].marker;
if (markerToPanTo)
mapComponent.panTo(markerToPanTo.getPosition());
};
/**
* Decodes the JSON input and generates and displays markers for each of the objects.
* Sample data:
* "[
* {"lat":48.856614,"lng":2.3522219000000177,"title":"","content":""},
* {"lat":48,"lng":3,"title":"near paris","content":"near Paris content"}
* ]"
* @param listOfMarkers a JSON representation of the markers to be displayed
*/
var addMarkersFromList = function(listOfMarkers) {
var allMarkers = [];
try{
allMarkers = JSON.parse(listOfMarkers);
}
catch(parseError) {
console.log('List of Markers is not valid JSON. Notifying Android side.');
androidObject.dispatchErrorToAndroid(androidObject.ERROR_PARSING_MARKERS_LIST)
}
function decodeMarker(markerObject){
var markerData = [];
var lat, lng;
if (markerObject.lat)
lat = markerObject.lat;
if (markerObject.lng)
lng = markerObject.lng;
if (lat && lng)
markerData[0] = locationFromLatLngCoords(lat, lng);
if (markerObject.title)
markerData[1] = markerObject.title;
if (markerObject.content)
markerData[2] = markerObject.content;
// Location has to be available(other fields are optional).
if (markerData[0] instanceof google.maps.LatLng)
return markerData;
else //TODO (jos) trigger user feedback or not?
return null;
}
allMarkers.forEach(function(markerObject) {
// Try to decode each marker and even if some fail, still add the others.
var markerData = decodeMarker(markerObject);
if (markerData)
addAIMarker(markerData[0], markerData[1], markerData[2]);
});
};
var locationFromLatLngCoords = function(lat, lng){
var errorParsing = false;
if (isNaN(lat) || isNaN(lng)) errorParsing = true;
if (lat < -90 || lat > 90) errorParsing = true;
if (lng < -180 || lng > 180) errorParsing = true;
if (errorParsing){
androidObject.dispatchErrorToAndroid(androidObject.ERROR_ILLEGAL_COORDS_FORMAT);
return null;
}
else
return new google.maps.LatLng(lat, lng);
};
/**
* Generates a LatLng map object from coordinates passed in as a string. Valid ranges are:
* Lat [-90, 90], and Lng [-180, 180].
* @param locationText a string in the format 'float, float'
* @returns {google.maps.LatLng} a LatLng object or null if the location is not in the
* right format.
*/
var locationFromTextCoords = function(locationText) {
var lat, lng;
var locationSplit = locationText.split(',');
if (locationSplit.length === 2){
lat = parseFloat(locationSplit[0]);
lng = parseFloat(locationSplit[1]);
return locationFromLatLngCoords(lat, lng);
}
else {
androidObject.dispatchErrorToAndroid(androidObject.ERROR_ILLEGAL_COORDS_FORMAT);
return null;
}
};
var addListenersForMarkers = function (add) {
if (add){
google.maps.event.addListener(mapComponent, 'click', function(event) {
var aiMarker = addAIMarker(event.latLng);
var markerJson = createJsonMarkerFromId(aiMarker.id);
androidObject.sendUserMarkerAddedToAndroid(markerJson);
});
}
else
google.maps.event.clearListeners(mapComponent,'click');
};
var showMarker = function(markerId, show) {
var markerToShow = aiMarkers[markerId].marker;
if (show) {
if (markerToShow){
markerToShow.setMap(mapComponent);
}
}
else {
if (markerToShow) {
markerToShow.setMap(null);
}
}
};
var showMarkers = function (show){
if (show) {
for (var key in aiMarkers){
aiMarkers[key].marker.setMap(mapComponent);
}
}
else {
for (var key in aiMarkers){
aiMarkers[key].marker.setMap(null);
}
}
};
var deleteMarkers = function (){
showMarkers(false);
aiMarkers = {};
};
var storeMarkers = function () {
var allMarkers = [];
for (var key in aiMarkers){
var marker = aiMarkers[key].marker;
var jsMarker = {};
jsMarker.lat = marker.getPosition().lat();
jsMarker.lng = marker.getPosition().lng();
jsMarker.title = marker.title || '';
if (marker.info && marker.info.content)
jsMarker.content = marker.info.content;
else
jsMarker.content = '';
allMarkers.push(jsMarker);
}
androidObject.sendListOfMarkersToAndroid(JSON.stringify(allMarkers));
return allMarkers;
};
//Geolocation service
var geolocate = function (address){
var geocoder = new google.maps.Geocoder();
geocoder.geocode({address: address}, geolocationResults)
};
function geolocationResults(results, status){
var notifyAndroid = false;
if (status === 'OK') {
var firstLocationFound = results[0].geometry.location;
if (firstLocationFound){
console.log(firstLocationFound);
var marker = addAIMarker(firstLocationFound);
var markerJson = createJsonMarkerFromId(marker.id);
androidObject.sendGeolocationMarkerAddedToAndroid(markerJson,
results[0].formatted_address);
}
else {
console.log('No location found!');
notifyAndroid = true;
}
}
else if (status === "ZERO_RESULTS"){
console.log('No results found for that particular address.');
notifyAndroid = true;
}
else {
console.log('No results found. Status of Geolocation call: ' + status);
notifyAndroid = true;
}
if (notifyAndroid) {
console.log('Notifying the Android side: No Results from Geolocation.')
androidObject.dispatchErrorToAndroid(androidObject.ERROR_NO_GEOLOCATION_RESULTS);
}
};
// InfoWindow functions
var createInfoWindow = function(markerId, content) {
var infoWindow = new google.maps.InfoWindow({
content: content
});
var marker = aiMarkers[markerId].marker;
if (marker)
marker.info = infoWindow;
};
var openInfoWindow = function(markerId){
var marker = aiMarkers[markerId].marker;
if (marker && marker.info)
marker.info.open(mapComponent, marker);
};
var closeInfoWindow = function(markerId){
var marker = aiMarkers[markerId].marker;
if (marker && marker.info)
marker.info.close();
};
var setMarkerTitle = function(markerId, title) {
var marker = aiMarkers[markerId].marker;
if (marker)
marker.setTitle(title);
};
//API for the mapMarkers object
return {
addMarkersFromList: addMarkersFromList,
addListenersForMarkers: addListenersForMarkers,
showMarker: showMarker,
showMarkers: showMarkers,
deleteMarkers: deleteMarkers,
storeMarkers: storeMarkers,
geolocate: geolocate,
panToMarker: panToMarker,
createInfoWindow: createInfoWindow,
openInfoWindow: openInfoWindow,
closeInfoWindow: closeInfoWindow,
locationFromTextCoords: locationFromTextCoords,
locationFromLatLngCoords: locationFromLatLngCoords,
setMarkerTitle: setMarkerTitle,
addAIMarker: addAIMarker,
aiMarkers: aiMarkers
};
};
/**
* Main function for this script. Initializes the map and all the related functionality.
*
*/
var thisMap = function(centerLat, centerLng, showCenter, initialZoom){
var map;
var centerMarker;
var markerFunctions;
var zoom = initialZoom || 6;
var showingCenter = showCenter || true;
function initialize() {
var mapOptions = {
zoom: zoom,
center: new google.maps.LatLng(centerLat, centerLng),
disableDoubleClickZoom: true
};
mapComponent = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
// Listening for the first 'idle' event to tell Android that the map is ready
google.maps.event.addListenerOnce(mapComponent, 'idle', function(){
console.log('Triggering mapIsReady on Android side.');
androidObject.mapIsReadyToAndroid();
});
centerMarker = createCenter();
showCenter(showingCenter);
//Initialize marker functions object
markerFunctions = mapMarkers(mapComponent);
}
var createCenter = function(){
if (centerMarker) centerMarker.setMap(null); // Delete any existing center first.
var newCenter;
if (mapComponent && mapComponent.getCenter()){
newCenter = new google.maps.Marker({
position: mapComponent.getCenter(),
map: mapComponent,
title: 'Map Center',
icon: {
path: google.maps.SymbolPath.CIRCLE,
scale: 6
}
});
}
return newCenter;
};
// Special case of showing a marker only for the center. Might be possible to abstract in
// markerFunctions, but leaving it here for now (jos).
var showCenter = function(show){
if (show){
if (centerMarker)
centerMarker.setMap(mapComponent);
else
centerMarker = createCenter();
}
else
centerMarker.setMap(null);
showingCenter = show;
};
var setCenter = function(location){
if (location instanceof google.maps.LatLng){
mapComponent.setCenter(location);
}
else mapComponent.setCenter(markerFunctions.locationFromTextCoords(location));
centerMarker = createCenter();
showCenter(showingCenter);
};
var getMap = function() { return mapComponent; };
var getMarkerFunctions = function() { return markerFunctions; };
var setZoom = function(zoom) {
if (zoom >= 0 && zoom <= 19){
mapComponent.setZoom(zoom);
}
else // Exception handling is also done on Android side
console.log('Zoom value ' + zoom + ' is not in the valid range 0-19');
};
var getZoom = function() { return mapComponent.zoom; };
//API for the thisMap object: main entry object for functionality
return {
initialize: initialize,
showCenter: showCenter,
setCenter: setCenter,
getMap: getMap, // For Debugging (not used from the component).
getMarkerFunctions: getMarkerFunctions,
setZoom: setZoom,
getZoom: getZoom
}
//TODO (jos) Magic numbers: the center of the map will come from Android
}(43.473847, -8.169154, true, 6); //Auto initialize the thisMap object
/**
* An object to hold functions that communicate directly to Android through the JS interface.
* @type {{ERROR_ILLEGAL_COORDS_FORMAT: number, ERROR_PARSING_MARKERS_LIST: number,
* ERROR_NO_GEOLOCATION_RESULTS: number, dispatchErrorToAndroid: dispatchErrorToAndroid,
* sendMarkerToAndroid: sendMarkerToAndroid,
* sendDoubleMarkerToAndroid: sendDoubleMarkerToAndroid,
* sendListOfMarkersToAndroid: sendListOfMarkersToAndroid,
* mapIsReadyToAndroid: mapIsReadyToAndroid,
* sendUserMarkerAddedToAndroid: sendUserMarkerAddedToAndroid,
* sendGeolocationMarkerAddedToAndroid: sendGeolocationMarkerAddedToAndroid}}
*/
var androidObject = {
// CONSTANTS FOR ERRORS, As defined on the Android side.
ERROR_ILLEGAL_COORDS_FORMAT: 2702,
ERROR_PARSING_MARKERS_LIST: 2703,
ERROR_INVALID_MARKER: 2704,
ERROR_NO_GEOLOCATION_RESULTS: 2706,
/**
* Function to dispatch errors to Android through the AppInventorMap interface. If this
* file is loaded on a browser, AppInventorMap will be undefined and we skip the
* dispatching.
* TODO (jos) think about Error handling in JS if I even want to use this file standalone.
* @param errorNumber number for the message to display as user feedback on the Android
* side. The messages are defined in ErrorMessages.java
*/
dispatchErrorToAndroid: function(errorNumber) {
if (typeof AppInventorMap !== 'undefined')
AppInventorMap.dispatchError(errorNumber);
},
/**
* Function to call to the Android side after a user has clicked on a marker
*/
sendMarkerToAndroid: function(jsonMarker) {
if (typeof AppInventorMap !== 'undefined')
AppInventorMap.handleMarker(jsonMarker);
},
sendDoubleMarkerToAndroid: function(jsonMarker) {
if (typeof AppInventorMap !== 'undefined')
AppInventorMap.handleDoubleMarker(jsonMarker);
},
/**
* Function to export all markers to the Android side for storage
*/
sendListOfMarkersToAndroid: function(markers) {
if (typeof AppInventorMap !== 'undefined')
AppInventorMap.storeMarkers(markers);
},
/**
* Notify Component that the Map is ready.
*/
mapIsReadyToAndroid: function() {
if (typeof AppInventorMap !== 'undefined')
AppInventorMap.mapIsReady();
},
sendUserMarkerAddedToAndroid: function(markerJson) {
if (typeof AppInventorMap !== 'undefined')
AppInventorMap.userMarkerAdded(markerJson);
},
sendGeolocationMarkerAddedToAndroid: function(markerJson, formattedAddress) {
if (typeof AppInventorMap !== 'undefined')
AppInventorMap.geolocationMarkerAdded(markerJson, formattedAddress);
}
};
google.maps.event.addDomListener(window, 'load', thisMap.initialize);
</script>
</head>
<body>
<div id="map-canvas"></div>
</body>
</html>