From 512f9d7d6d856bb0fc809ad4a715715d64426554 Mon Sep 17 00:00:00 2001
From: Shawn Lin <shawn@timezoneone.com>
Date: Fri, 4 Mar 2016 14:08:39 +1300
Subject: [PATCH] Save map bounds

---
 _config/googlemapfield.yml   |  1 +
 code/GoogleMapField.php      | 18 ++++++++++++++++--
 javascript/GoogleMapField.js | 21 ++++++++++++++++++---
 3 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/_config/googlemapfield.yml b/_config/googlemapfield.yml
index 85b570a..4bdcbe1 100644
--- a/_config/googlemapfield.yml
+++ b/_config/googlemapfield.yml
@@ -9,6 +9,7 @@ GoogleMapField:
       Latitude: 'Latitude'
       Longitude: 'Longitude'
       Zoom: 'Zoom'
+      Bounds: 'Bounds'
     map:
       zoom: 14
     default_field_values:
diff --git a/code/GoogleMapField.php b/code/GoogleMapField.php
index 58c0759..1f597d9 100644
--- a/code/GoogleMapField.php
+++ b/code/GoogleMapField.php
@@ -27,6 +27,11 @@ class GoogleMapField extends FormField {
 	 * @var FormField
 	 */
 	protected $zoomField;
+	
+	/**
+	 * @var FormField
+	 */
+	protected $boundsField;
 
 	/**
 	 * The merged version of the default and user specified options
@@ -104,11 +109,16 @@ public function setupChildren() {
 			'Zoom',
 			$this->recordFieldData('Zoom')
 		)->addExtraClass('googlemapfield-zoomfield');
-
+		$this->boundsField = HiddenField::create(
+			$name.'[Bounds]',
+			'Bounds',
+			$this->recordFieldData('Bounds')
+		)->addExtraClass('googlemapfield-boundsfield');
 		$this->children = new FieldList(
 			$this->latField,
 			$this->lngField,
-			$this->zoomField
+			$this->zoomField,
+			$this->boundsField
 		);
 
 		if($this->options['show_search_box']) {
@@ -174,6 +184,9 @@ public function setValue($record) {
 		$this->zoomField->setValue(
 			$record['Zoom']
 		);
+		$this->boundsField->setValue(
+			$record['Bounds']
+		);
 		return $this;
 	}
 
@@ -185,6 +198,7 @@ public function saveInto(DataObjectInterface $record) {
 		$record->setCastedField($this->childFieldName('Latitude'), $this->latField->dataValue());
 		$record->setCastedField($this->childFieldName('Longitude'), $this->lngField->dataValue());
 		$record->setCastedField($this->childFieldName('Zoom'), $this->zoomField->dataValue());
+		$record->setCastedField($this->childFieldName('Bounds'), $this->boundsField->dataValue());
 		return $this;
 	}
 
diff --git a/javascript/GoogleMapField.js b/javascript/GoogleMapField.js
index ac745d8..40b1dc1 100644
--- a/javascript/GoogleMapField.js
+++ b/javascript/GoogleMapField.js
@@ -32,6 +32,7 @@
 			latField = field.find('.googlemapfield-latfield'),
 			lngField = field.find('.googlemapfield-lngfield'),
 			zoomField = field.find('.googlemapfield-zoomfield'),
+			boundsField = field.find('.googlemapfield-boundsfield'),
 			search = field.find('.googlemapfield-searchfield');
 
 		// Update the hidden fields and mark as changed
@@ -43,6 +44,7 @@
 
 			latField.val(latCoord);
 			lngField.val(lngCoord);
+			updateBounds();
 
 			if (!init) {
 				// Mark as changed(?)
@@ -53,6 +55,16 @@
 		function updateZoom() {
 			zoomField.val(map.getZoom());
 		}
+		
+		function updateBounds() {
+			var bounds = JSON.stringify(map.getBounds().toJSON());
+			boundsField.val(bounds);
+		}
+
+		function zoomChanged() {
+			updateZoom();
+			updateBounds();
+		}
 
 		function centreOnMarker() {
 			var center = marker.getPosition();
@@ -63,7 +75,7 @@
 		function mapClicked(ev) {
 			var center = ev.latLng;
 			marker.setPosition(center);
-			updateField(center);
+			centreOnMarker();
 		}
 
 		function geoSearchComplete(result, status) {
@@ -87,13 +99,16 @@
 		}
 
 		// Populate the fields to the current centre
-		updateField(map.getCenter(), true);
+		google.maps.event.addListenerOnce(map, 'idle', function(){
+			updateField(map.getCenter(), true);
+			updateZoom();
+		});
 
 		google.maps.event.addListener(marker, 'dragend', centreOnMarker);
 
 		google.maps.event.addListener(map, 'click', mapClicked);
 
-		google.maps.event.addListener(map, 'zoom_changed', updateZoom);
+		google.maps.event.addListener(map, 'zoom_changed', zoomChanged);
 
 		search.on({
 			'change': searchReady,