[css] allow single view refresh, and a comment for posterity

src/css/src/NIDOM.h

@@ -85,6 +85,7 @@ _dom = [[NIDOM alloc] initWithStylesheet:stylesheet];
 - (void)unregisterView:(UIView *)view;
 - (void)unregisterAllViews;
 - (void)refresh;
+- (void)refreshView: (UIView*) view;
 
 -(UIView*)viewById: (NSString*) viewId;
 
@@ -160,13 +161,19 @@ _dom = [[NIDOM alloc] initWithStylesheet:stylesheet];
 /** @name Re-Applying All Styles */
 
 /**
- * Reapplies the stylesheet to all views.
- *
- * This only needs to be called if the stylesheet has changed.
+ * Reapplies the stylesheet to all views. Since there may be positioning involved,
+ * you may need to reapply if layout or sizes change.
  *
  *      @fn NIDOM::refresh
  */
 
+/**
+ * Reapplies the stylesheet to a single view. Since there may be positioning involved,
+ * you may need to reapply if layout or sizes change.
+ *
+ *      @fn NIDOM::refreshView:
+ */
+
 /**
  * Removes the association of a view with a CSS class. Note that this doesn't
  * "undo" the styles that the CSS class generated, it just stops applying them

src/css/src/NIDOM.m

@@ -288,6 +288,13 @@ - (void)refresh {
   }
 }
 
+///////////////////////////////////////////////////////////////////////////////////////////////////
+- (void)refreshView:(UIView *)view {
+    for (NSString* selector in [_viewToSelectorsMap objectForKey:[self keyForView:view]]) {
+        [self refreshStyleForView:view withSelectorName:selector];
+    }
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 -(UIView *)viewById:(NSString *)viewId
 {

src/css/src/UIView+NIStyleable.m

@@ -311,6 +311,7 @@ - (NSString*)applyOrDescribe: (BOOL) apply ruleSet: (NICSSRuleset*) ruleSet inDO
     }
   }
   // TODO - should specifying both left/right or top/bottom set the width instead?
+  // TODO - how does left/right/top/bottom interact with relative positioning if at all?
   if ([ruleSet hasRight]) {
     NICSSUnit u = ruleSet.right;
     switch (u.type) {