made a flag available to tell if track is being dragged, see phetsims…

…/resistance-in-a-wire#204
phetsims · Dec 28, 2018 · 3c28faa · 3c28faa
1 parent 9ee7275
commit 3c28faa
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Showing 2 changed files with 7 additions and 2 deletions.
diff --git a/js/Slider.js b/js/Slider.js
@@ -143,7 +143,7 @@ define( function( require ) {
     // @private mapping between value and track position
     this.valueToPosition = new LinearFunction( range.min, range.max, 0, options.trackSize.width, true /* clamp */ );
 
-    // @private track
+    // @public (read-only) {SliderTrack} - track upon which the thumb slides
     this.track = new SliderTrack( valueProperty, this.valueToPosition, {
 
       // propagate options that are specific to SliderTrack
@@ -243,7 +243,7 @@ define( function( require ) {
     } );
     thumb.addInputListener( thumbInputListener );
 
-    // @public (read-only) {Boolean} - flag that indicates whether the thumb is currently being dragged
+    // @public (read-only) {boolean} - flag that indicates whether the thumb is currently being dragged
     this.thumbDragging = false;
     var thumbDraggingListener = thumbInputListener.isDraggingProperty.linkAttribute( this, 'thumbDragging' );
 

diff --git a/js/SliderTrack.js b/js/SliderTrack.js
@@ -61,6 +61,9 @@ define( function( require ) {
     // @public
     this.valueToPosition = valueToPosition;
 
+    // @public (read-only) {boolean} - a flag that indicates if the track is being dragged by the user
+    this.trackDragging = false;
+
     // @private - Represents the disabled range of the slider, always visible and always the full range
     // of the slider so that when the enabled range changes we see the enabled sub-range on top of the
     // full range of the slider.
@@ -98,6 +101,7 @@ define( function( require ) {
       tandem: options.tandem.createTandem( 'trackInputListener' ),
 
       start: function( event, trail ) {
+        self.trackDragging = true;
         if ( self.enabledProperty.get() ) {
           options.startDrag();
           handleTrackEvent( event, trail );
@@ -114,6 +118,7 @@ define( function( require ) {
         if ( self.enabledProperty.get() ) {
           options.endDrag();
         }
+        self.trackDragging = false;
       }
     } );
     this.enabledTrack.addInputListener( trackInputListener );