port TemplateBinding to ed3266266e751b5ab1f75f8e0509d0d5f0ef35d8

pkg/template_binding/lib/src/input_bindings.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of template_binding;
 
 abstract class _InputBinding extends NodeBinding {
   StreamSubscription _eventSub;
 
   _InputBinding(node, name, model, path): super(node, name, model, path) {
@@ skipping 130 matching lines @@
     // <optgroup> iterating and then for <option>.
     //
     // Unlike the JavaScript implemenation, we don't have a special
     // "Object.observe" event loop to schedule on.
     // (See the the "ensureScheduled" function:
     // https://github.com/Polymer/mdv/commit/9a51ad7ed74a292bf71662cea28acbd151ff65c8)
     //
     // Instead we use scheduleMicrotask. Each <template repeat> needs a delay of
     // 2:
     //   * once to happen after the child _TemplateIterator is created
-    //   * once to be after _TemplateIterator.inputs CompoundBinding resolve
+    //   * once to be after _TemplateIterator's CompoundPathObserver resolve
     // And then we need to do this delay sequence twice:
     //   * once for OPTGROUP
     //   * once for OPTION.
     // The resulting 2 * 2 is our maxRetries.
+    //
     // TODO(jmesserly): a much better approach would be to find the nested
     // <template> and wait on some future that completes when it has expanded.
     var maxRetries = 4;
     delaySetSelectedIndex() {
       if (!_tryUpdateValue(newValue) && maxRetries-- > 0) {
         scheduleMicrotask(delaySetSelectedIndex);
       }
     }
 
     scheduleMicrotask(delaySetSelectedIndex);
@@ skipping 20 matching lines @@
 
   // TODO(jmesserly,sigmund): I wonder how many bindings typically convert from
   // one type to another (e.g. value-as-number) and whether it is useful to
   // have something like a int/num binding converter (either as a base class or
   // a wrapper).
   static int _toInt(value) {
     if (value is String) return int.parse(value, onError: (_) => 0);
     return value is int ? value : 0;
   }
 }