Implement measurement using futures

client/html/src/DocumentWrappingImplementation.dart

 // Copyright (c) 2011, 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.
 
 class DocumentEventsImplementation extends ElementEventsImplementation
       implements DocumentEvents {
 
   DocumentEventsImplementation._wrap(_ptr) : super._wrap(_ptr);
 
   EventListenerList get readyStateChange() => _get('readystatechange');
@@ skipping 46 matching lines @@
   StyleSheetList get styleSheets() => LevelDom.wrapStyleSheetList(_documentPtr.styleSheets);
 
   String get title() => _documentPtr.title;
 
   void set title(String value) { _documentPtr.title = value; }
 
   bool get webkitHidden() => _documentPtr.webkitHidden;
 
   String get webkitVisibilityState() => _documentPtr.webkitVisibilityState;
 
-  Promise<Range> caretRangeFromPoint([int x = null, int y = null]) {
-    throw 'TODO(jacobr): impl promise.';
-    // return LevelDom.wrapRange(_documentPtr.caretRangeFromPoint(x, y));
+  Future<Range> caretRangeFromPoint([int x = null, int y = null]) {
+    return _createMeasurementFuture(
+        () => LevelDom.wrapRange(_documentPtr.caretRangeFromPoint(x, y)),
+        new Completer<Range>());
   }
 
   Element createElement([String tagName = null]) {
     return LevelDom.wrapElement(_documentPtr.createElement(tagName));
   }
 
   Event createEvent([String eventType = null]) {
     return LevelDom.wrapEvent(_documentPtr.createEvent(eventType));
   }
 
-  Promise<Element> elementFromPoint([int x = null, int y = null]) {
-    throw 'TODO(jacobr): impl using promise';
-    // return LevelDom.wrapElement(_documentPtr.elementFromPoint(x, y));
+  Future<Element> elementFromPoint([int x = null, int y = null]) {
+    return _createMeasurementFuture(
+        () => LevelDom.wrapElement(_documentPtr.elementFromPoint(x, y)),
+        new Completer<Element>());
   }
 
   bool execCommand([String command = null, bool userInterface = null, String value = null]) {
     return _documentPtr.execCommand(command, userInterface, value);
   }
 
   CanvasRenderingContext getCSSCanvasContext(String contextId, String name,
                                              int width, int height) {
     return LevelDom.wrapCanvasRenderingContext(_documentPtr.getCSSCanvasContext(contextId, name, width, height));
   }
@@ skipping 22 matching lines @@
 
   void set manifest(String value) { _ptr.manifest = value; }
 
   DocumentEvents get on() {
     if (_on === null) {
       _on = new DocumentEventsImplementation._wrap(_ptr);
     }
     return _on;
   }
 }