#679804 by srobert72 (some modifications by myself) - adds:

* Add Google Bar to search on map
* Add option for a marker tooltip field on gmap views
* Add option to highlight markers on mouse rollover event
* Add option to center Gmap on marker of node passed as argument in view
* Add option to highlight markers of node passed as argument in view

gmap.css

@@ -32,3 +32,12 @@
   /* Don't let long copyright texts stick out the side of the map div. */
   overflow: hidden;
 }
+
+/* Clean up unwanted styling for google toolbar */
+.gmap-map .gmnoprint table {
+  margin: 0;
+}
+
+.gmap-map .gmnoprint tbody {
+  border-top: none;
+}

gmap.module

@@ -38,6 +38,7 @@ function gmap_defaults() {
     'styles' => array(
       'line_default' => array('0000ff', 5, 45, '', 0, 0),
       'poly_default' => array('000000', 3, 25, 'ff0000', 45),
+      'highlight_color' => 'ff0000',
     ),
     'line_colors' => array('#00cc00', '#ff0000', '#0000ff'),
   );
@@ -119,6 +120,7 @@ function gmap_gmap($op, &$map) {
 
         drupal_add_js($path . 'icon.js');
         drupal_add_js($path . 'marker.js');
+        drupal_add_js($path .'highlight.js');
 
         $mm = variable_get('gmap_mm_type', 'gmap');
         // If you really really want to override the marker manager, implement
@@ -220,6 +222,18 @@ function gmap_gmap($op, &$map) {
           'help' => t('Used for advanced javascript work, this will enable the <em>clickshape</em> event.'),
           'internal' => TRUE,
         ),
+        'googlebar' => array(
+          'title' => t('Enable Google Bar'),
+          'default' => FALSE,
+          'help' => t('Enable the "Google Bar" at bottom of the map.'),
+          'previewable' => TRUE,
+        ),
+        'highlight' => array(
+          'title' => t('Highlight marker on rollover'),
+          'default' => FALSE,
+          'help' => t('Highlight marker by creating circle on mouse rollover event.'),
+          'previewable' => TRUE,
+        ),
       );
       break;
 
@@ -279,6 +293,7 @@ function _gmap_doheader() {
     drupal_add_js($gmap_path . '/thirdparty/' . $mms[$mm]['filename']);
   }
   drupal_add_js($gmap_path . '/js/marker.js');
+  drupal_add_js($gmap_path . '/js/highlight.js');
   drupal_add_js($gmap_path . '/js/' . $mm . '_marker.js');
   drupal_add_js(array('gmap_markermanager' => $mms[$mm]), 'setting');
 // @@@

gmap_plugin_style_gmap.inc

@@ -33,6 +33,16 @@ class gmap_plugin_style_gmap extends views_plugin_style {
     $options['lonfield'] = array('default' => '');
     $options['markerfield'] = array('default' => '');
 
+    $options['center_on_nodearg'] = array('default' => 0);
+    $options['center_on_nodearg_arg'] = array('default' => '');
+
+    $options['highlight_nodearg'] = array('default' => 0);
+    $options['highlight_nodearg_arg'] = array('default' => '');
+    $options['highlight_nodearg_color'] = array('default' => '#FF0000');
+
+    $options['tooltipenabled'] = array('default' => 0);
+    $options['tooltipfield'] = array('default' => '');
+
     return $options;
   }
 
@@ -81,11 +91,16 @@ class gmap_plugin_style_gmap extends views_plugin_style {
     if ($this->options['datasource'] == 'fields') {
       $lat_fied_obj = $this->view->display_handler->get_handler('field', $this->options['latfield']);
       $lon_field_obj = $this->view->display_handler->get_handler('field', $this->options['lonfield']);
-
       $lat_field = $lat_fied_obj->field_alias;
       $lon_field = $lon_field_obj->field_alias;
     }
 
+    $tooltip_field = '';
+    if ($this->options['tooltipenabled']) {
+      $tooltip_field_obj = $this->view->display_handler->get_handler('field', $this->options['tooltipfield']);
+      $tooltip_field = $tooltip_field_obj->field_alias;
+    }
+
     // Determine fieldname for marker field.
     if ($this->options['markers'] == 'field') {
       $marker_field_obj = $this->view->display_handler->get_handler('field', $this->options['markerfield']);
@@ -111,10 +126,31 @@ class gmap_plugin_style_gmap extends views_plugin_style {
     foreach ($sets as $title => $records) {
       $markers = array();
       $offsets = array();
+      $center_lat = null;
+      $center_lon = null;
+      $center_nid = null;
+      $highlight_nid = null;
+
+      // We search nid argument used to center map
+      if ($this->options['center_on_nodearg'] && $nodehandler = $this->view->display_handler->get_handler('argument', $this->options['center_on_nodearg_arg'])) {
+        $center_nid = $nodehandler->get_value();
+      }
+      if ($this->options['highlight_nodearg'] && $nodehandler = $this->view->display_handler->get_handler('argument', $this->options['highlight_nodearg_arg'])) {
+        $highlight_nid = $nodehandler->get_value();
+      }
+
       foreach ($records as $row_index => $row) {
         $this->view->row_index = $row_index;
         $lat = (float)$row->{$lat_field};
         $lon = (float)$row->{$lon_field};
+
+        // If this row will be used as center map then we keep its lon/lat
+        // If there are multiple points on a single node take the first match
+        if (!empty($center_nid) && $center_nid == $row->nid && ($center_lon === NULL || $center_lat === NULL)) {
+          $center_lon = $lon;
+          $center_lat = $lat;
+        }
+
         if (!empty($lat) && !empty($lon)) {
           if ($this->options['markers'] == 'nodetype') {
             if (isset($markertypes[$row->gmap_node_type])) {
@@ -142,22 +178,42 @@ class gmap_plugin_style_gmap extends views_plugin_style {
           if (!isset($offsets[$markername])) {
             $offsets[$markername] = 0;
           }
+
+          $tooltip = "";
+          if ($this->options['tooltipenabled'] && $row->$tooltip_field) {
+            $tooltip = $row->$tooltip_field;
+          }
+
           $markers[] = array(
             'latitude' => $lat,
             'longitude' => $lon,
             'markername' => $markername,
             'offset' => $offsets[$markername],
             'text' => $this->row_plugin->render($row),
+            'opts' => array(
+              'title' => $tooltip,
+              'highlight' => ($highlight_nid == $row->nid) ? 1 : 0,
+              'highlightcolor' => $this->options['highlight_nodearg_color'],
+            ),
           );
+
           $offsets[$markername]++;
         }
       }
       if (!empty($markers)) { // Don't draw empty maps.
         $map = gmap_parse_macro($this->options['macro']);
+
+        // If center lon/lat are not empty they are used to center map
+        if (!empty($center_lon) && !empty($center_lat)) {
+          $map['longitude'] = $center_lon;
+          $map['latitude'] = $center_lat;
+        }
+
         $map['markers'] = $markers;
         $output .= theme($this->theme_functions(), $this->view, $this->options, $map, $title);
       }
     }
+
     unset($this->view->row_index);
     return $output;
   }
@@ -167,6 +223,19 @@ class gmap_plugin_style_gmap extends views_plugin_style {
    */
   function options_form(&$form, &$form_state) {
     parent::options_form($form, $form_state);
+
+    $field_options = array();
+    $fields = $this->display->handler->get_handlers('field');
+    foreach ($fields as $id => $handler) {
+      $field_options[$id] = $handler->ui_name(FALSE);
+    }
+
+    $argument_options = array();
+    $arguments = $this->display->handler->get_handlers('argument');
+    foreach ($arguments as $id => $handler) {
+      $argument_options[$id] = $handler->ui_name(FALSE);
+    }
+
     $form['macro'] = array(
       '#type' => 'textfield',
       '#title' => t('Macro'),
@@ -185,19 +254,11 @@ class gmap_plugin_style_gmap extends views_plugin_style {
       '#default_value' => $this->options['datasource'],
       '#multiple' => FALSE,
     );
-
-    $options = array();
-    $fields = $this->display->handler->get_handlers('field');
-
-    foreach ($fields as $id => $handler) {
-      $options[$id] = $handler->ui_name(FALSE);
-    }
-
     $form['latfield'] = array(
       '#title' => t('Latitude field'),
       '#description' => t('Format must be degrees decimal.'),
       '#type' => 'select',
-      '#options' => $options,
+      '#options' => $field_options,
       '#default_value' => $this->options['latfield'],
       '#process' => array('views_process_dependency'),
       '#dependency' => array('edit-style-options-datasource' => array('fields')),
@@ -206,7 +267,7 @@ class gmap_plugin_style_gmap extends views_plugin_style {
       '#title' => t('Longitude field'),
       '#description' => t('Format must be degrees decimal.'),
       '#type' => 'select',
-      '#options' => $options,
+      '#options' => $field_options,
       '#default_value' => $this->options['lonfield'],
       '#process' => array('views_process_dependency'),
       '#dependency' => array('edit-style-options-datasource' => array('fields')),
@@ -225,12 +286,11 @@ class gmap_plugin_style_gmap extends views_plugin_style {
       ),
       '#default_value' => $this->options['markers'],
     );
-
     $form['markerfield'] = array(
       '#type' => 'select',
       '#title' => t('Marker field'),
       '#description' => t('You can use a views field to set the <em>markername</em> property of the markers.'),
-      '#options' => $options,
+      '#options' => $field_options,
       '#default_value' => $this->options['markerfield'],
       '#process' => array('views_process_dependency'),
       '#dependency' => array('edit-style-options-markers' => array('field')),
@@ -246,5 +306,72 @@ class gmap_plugin_style_gmap extends views_plugin_style {
       '#title' => t('Marker / fallback marker to use'),
       '#default_value' => $this->options['markertype'],
     );
+
+    $form['center_on_nodearg'] = array(
+      '#type' => 'checkbox',
+      '#title' => t('Center on node argument'),
+      '#default_value' => $this->options['center_on_nodearg'],
+      '#description' => t('Note: The view must contain a node by node id as an argument Global:Null'),
+    );
+    $form['center_on_nodearg_arg'] = array(
+      '#title' => t('Argument'),
+      '#description' => empty($argument_options) ? t("The value of the selected argument must be a number that matches a node ID.  Use the 'Global: Null' argument if you don't want to also restrict results to that node ID.  You must have added arguments to the view to use this option.") : t("The selected argument must be a number that matches a node ID.  Use the 'Global: Null' argument if you don't want to also restrict results to that node ID."),
+      '#type' => 'select',
+      '#options' => $argument_options,
+      '#default_value' => $this->options['center_on_nodearg_arg'],
+      '#process' => array('views_process_dependency'),
+      '#dependency' => array('edit-style-options-center-on-nodearg' => array(TRUE)),
+    );
+
+    $form['highlight_nodearg'] = array(
+      '#type' => 'checkbox',
+      '#title' => t('Highlight marker for node argument'),
+      '#default_value' => $this->options['highlight_nodearg'],
+      '#description' => t('Note: The view must contain a node by node id as an argument Global:Null'),
+    );
+    $form['highlight_nodearg_arg'] = array(
+      '#title' => t('Argument'),
+      '#description' => empty($argument_options) ? t("The value of the selected argument must be a number that matches a node ID.  Use the 'Global: Null' argument if you don't want to also restrict results to that node ID.  You must have added arguments to the view to use this option.") : t("The value of the selected argument must be a number that matches a node ID.  Use the 'Global: Null' argument if you don't want to also restrict results to that node ID."),
+      '#type' => 'select',
+      '#options' => $argument_options,
+      '#default_value' => $this->options['highlight_nodearg_arg'],
+      '#process' => array('views_process_dependency'),
+      '#dependency' => array('edit-style-options-highlight-nodearg' => array(TRUE)),
+    );
+    $form['highlight_nodearg_color'] = array(
+      '#title' => t('Highlight color'),
+      '#description' => t("A 6 digit hex color value to use for the highlight. Include preceding hash. Example #FF0000"),
+      '#type' => 'textfield',
+      '#size' => 7,
+      '#maxlength' => 7,
+      '#default_value' => $this->options['highlight_nodearg_color'],
+      '#process' => array('views_process_dependency'),
+      '#dependency' => array('edit-style-options-highlight-nodearg' => array(TRUE)),
+    );
+
+    $form['tooltipenabled'] = array(
+      '#type' => 'checkbox',
+      '#title' => t('Display a tooltip when hovering over markers'),
+      '#default_value' => $this->options['tooltipenabled'],
+    );
+    $form['tooltipfield'] = array(
+      '#title' => t('Tooltip field'),
+      '#description' => empty($field_options) ? t("The field's format must be text.  You must be using the fields row style and have added fields to the view to use this option.") : t("The field's format must be text."),
+      '#type' => 'select',
+      '#options' => $field_options,
+      '#default_value' => $this->options['tooltipfield'],
+      '#process' => array('views_process_dependency'),
+      '#dependency' => array('edit-style-options-tooltipenabled' => array(TRUE)),
+    );
+  }
+
+  /**
+   * Validate the options form.
+   */
+  function options_validate(&$form, &$form_state) {
+    // Check if highlight color is a valid hex color
+    if (!preg_match('/^#[a-f0-9]{6}$/i', $form_state['values']['style_options']['highlight_nodearg_color'])) {
+      form_error($form['highlight_nodearg_color'], t('Highlight colour must be a valid hex code in the form #FF0000.'));
+    } 
   }
 }

gmap_settings_ui.inc

@@ -144,6 +144,15 @@ function gmap_admin_settings(&$form_state) {
     '#description' => t('Polygons without a specific style defined will fall back to this style'),
     '#default_value' => $defaults['styles']['poly_default'],
   );
+  $form['gmap_default']['styles']['highlight_color'] = array(
+    '#type' => 'textfield',
+    '#title' => t('Highlight color'),
+    '#size' => 6,
+    '#maxlength' => 6,
+    '#field_prefix' => '#',
+    '#description' => t('This sets the color of the marker highlight when the "highlight : Highlight marker on rollover" behaviour is enabled. Hex color value. Example: #00AA33'),
+    '#default_value' => $defaults['styles']['highlight_color'],
+  );
 
   $form['gmap_default']['controltype'] = array(
     '#type' => 'select',

js/gmap.js

@@ -300,6 +300,9 @@ Drupal.gmap.addHandler('gmap', function (elem) {
     if (obj.vars.behavior.overview) {
       map.addControl(new GOverviewMapControl());
     }
+    if (obj.vars.behavior.googlebar) {
+      map.enableGoogleBar();
+    }
     if (obj.vars.behavior.scale) {
       map.addControl(new GScaleControl());
     }

js/highlight.js

+/* $Id$ */
+
+/**
+ * @file
+ * Common marker highlighting routines.
+ */
+
+/**
+ * Highlights marker on rollover.
+ * Removes highlight on previous marker.
+ *
+ * Creates a "circle" using 20-sided GPolygon at the given point
+ * Circle polygon object is global variable as there is only one highlighted marker at a time
+ * and we want to remove the previously placed polygon before placing a new one.
+ * 
+ * Original code "Google Maps JavaScript API Example"
+ */
+highlightMarker = function (map, currentMarker, highlightID, color) {
+  var markerPoint = currentMarker.marker.getPoint();
+  var polyPoints = Array();
+
+  var mapNormalProj = G_NORMAL_MAP.getProjection();
+  var mapZoom = map.getZoom();
+  var clickedPixel = mapNormalProj.fromLatLngToPixel(markerPoint, mapZoom);
+
+  var polySmallRadius = 20;
+  var polyNumSides = 20;
+  var polySideLength = 18;
+
+  for (var a = 0; a < (polyNumSides + 1); a++) {
+    var aRad = polySideLength * a * (Math.PI/180);
+    var polyRadius = polySmallRadius; 
+    var pixelX = clickedPixel.x + polyRadius * Math.cos(aRad);
+    var pixelY = clickedPixel.y + polyRadius * Math.sin(aRad);
+    var polyPixel = new GPoint(pixelX, pixelY);
+    var polyPoint = mapNormalProj.fromPixelToLatLng(polyPixel, mapZoom);
+    polyPoints.push(polyPoint);
+  }
+  // Using GPolygon(points,  strokeColor?,  strokeWeight?,  strokeOpacity?,  fillColor?,  fillOpacity?)
+  map.highlightID = new GPolygon(polyPoints, color, 2, 0, color, 0.5);
+  map.addOverlay(map.highlightID);
+};
+
+unHighlightMarker = function (map, currentMarker, highlightID) {
+  if (map.highlightID) {
+    map.removeOverlay(map.highlightID);
+    delete map.highlightID;
+  }
+};

js/marker.js

@@ -22,6 +22,15 @@ Drupal.gmap.addHandler('gmap', function (elem) {
     GEvent.addListener(m, 'click', function () {
       obj.change('clickmarker', -1, marker);
     });
+    if (obj.vars.behavior.highlight) {
+      GEvent.addListener(m, 'mouseover', function () {
+        var highlightColor = '#' + obj.vars.styles.highlight_color;
+        highlightMarker(obj.map, marker, 'hoverHighlight', highlightColor);
+      });
+      GEvent.addListener(m, 'mouseout', function () {
+        unHighlightMarker(obj.map, marker, 'hoverHighlight');
+      });
+    }
     if (obj.vars.behavior.extramarkerevents) {
       GEvent.addListener(m, 'mouseover', function () {
         obj.change('mouseovermarker', -1, marker);
@@ -42,6 +51,10 @@ Drupal.gmap.addHandler('gmap', function (elem) {
     if (obj.vars.behavior.autozoom) {
       obj.bounds.extend(marker.marker.getPoint());
     }
+    // If the highlight arg option is used in views highlight the marker.
+    if (marker.opts.highlight == 1) {
+      highlightMarker(obj.map, marker, 'viewHighlight', marker.opts.highlightcolor);
+    }
   });
 
   // Default marker actions.