Add label option to FullScreen control

css/ol.css

@@ -120,12 +120,6 @@
 .ol-zoom .ol-zoom-out {
   border-radius: 0 0 2px 2px;
 }
-button.ol-full-screen-false:after {
-  content: "\2194";
-}
-button.ol-full-screen-true:after {
-  content: "\00d7";
-}
 
 
 .ol-attribution {

externs/olx.js

@@ -980,6 +980,8 @@ olx.control.DefaultsOptions.prototype.zoomOptions;
 
 /**
  * @typedef {{className: (string|undefined),
+ *     label: (string|undefined),
+ *     labelActive: (string|undefined),
  *     tipLabel: (string|undefined),
  *     keys: (boolean|undefined),
  *     target: (Element|undefined)}}
@@ -996,6 +998,23 @@ olx.control.FullScreenOptions;
 olx.control.FullScreenOptions.prototype.className;
 
 
+/**
+ * Text label to use for the button. Default is `\u2194` (an arrow).
+ * @type {string|undefined}
+ * @api
+ */
+olx.control.FullScreenOptions.prototype.label;
+
+
+/**
+ * Text label to use for the button when full-screen is active.
+ * Default is `\u00d7` (a cross).
+ * @type {string|undefined}
+ * @api
+ */
+olx.control.FullScreenOptions.prototype.labelActive;
+
+
 /**
  * Text label to use for the button tip. Default is `Toggle full-screen`
  * @type {string|undefined}

src/ol/control/fullscreencontrol.js

@@ -3,7 +3,6 @@ goog.provide('ol.control.FullScreen');
 goog.require('goog.asserts');
 goog.require('goog.dom');
 goog.require('goog.dom.TagName');
-goog.require('goog.dom.classlist');
 goog.require('goog.dom.fullscreen');
 goog.require('goog.dom.fullscreen.EventType');
 goog.require('goog.events');
@@ -37,13 +36,33 @@ ol.control.FullScreen = function(opt_options) {
   this.cssClassName_ = goog.isDef(options.className) ?
       options.className : 'ol-full-screen';
 
+  var label = goog.isDef(options.label) ?
+      options.label : '\u2194';
+
+  /**
+   * @private
+   * @type {Node}
+   */
+  this.labelNode_ = /** @type {Node} */ (goog.isString(label) ?
+          goog.dom.createTextNode(label) : label);
+
+  var labelActive = goog.isDef(options.labelActive) ?
+      options.labelActive : '\u00d7';
+
+  /**
+   * @private
+   * @type {Node}
+   */
+  this.labelActiveNode_ = /** @type {Node} */ (goog.isString(labelActive) ?
+          goog.dom.createTextNode(labelActive) : labelActive);
+
   var tipLabel = goog.isDef(options.tipLabel) ?
       options.tipLabel : 'Toggle full-screen';
   var button = goog.dom.createDom(goog.dom.TagName.BUTTON, {
     'class': this.cssClassName_ + '-' + goog.dom.fullscreen.isFullScreen(),
     'type': 'button',
     'title': tipLabel
-  });
+  }, this.labelNode_);
 
   goog.events.listen(button, goog.events.EventType.CLICK,
       this.handleClick_, false, this);
@@ -120,14 +139,11 @@ ol.control.FullScreen.prototype.handleFullScreen_ = function() {
  * @private
  */
 ol.control.FullScreen.prototype.handleFullScreenChange_ = function() {
-  var opened = this.cssClassName_ + '-true';
-  var closed = this.cssClassName_ + '-false';
-  var anchor = goog.dom.getFirstElementChild(this.element);
   var map = this.getMap();
   if (goog.dom.fullscreen.isFullScreen()) {
-    goog.dom.classlist.swap(anchor, closed, opened);
+    goog.dom.replaceNode(this.labelActiveNode_, this.labelNode_);
   } else {
-    goog.dom.classlist.swap(anchor, opened, closed);
+    goog.dom.replaceNode(this.labelNode_, this.labelActiveNode_);
   }
   if (!goog.isNull(map)) {
     map.updateSize();

src/ol/control/zoomtoextentcontrol.js

@@ -32,8 +32,7 @@ ol.control.ZoomToExtent = function(opt_options) {
   var className = goog.isDef(options.className) ? options.className :
       'ol-zoom-extent';
 
-  var label = goog.isDef(options.label) ?
-      options.label : 'E';
+  var label = goog.isDef(options.label) ? options.label : 'E';
   var tipLabel = goog.isDef(options.tipLabel) ?
       options.tipLabel : 'Fit to extent';
   var button = goog.dom.createDom(goog.dom.TagName.BUTTON, {