ceil/floor/truncate/round return integers.

samples/swarm/Views.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.
 
 part of swarmlib;
 
 // This file contains View framework classes.
 // As it grows, it may need to be split into multiple files.
 
 /** A factory that creates a view from a data model. */
@@ skipping 651 matching lines @@
     } else {
       return itemLength * (_data.length - 1) + Math.max(viewLength, itemLength);
     }
   }
 
   int getOffset(int index) {
     return index * _itemLength;
   }
 
   int getPageLength(int viewLength) {
-    final itemsPerPage = (viewLength / _itemLength).floor();
-    return (Math.max(1, itemsPerPage) * _itemLength).toInt();
+    final itemsPerPage = viewLength ~/ _itemLength;
+    return Math.max(1, itemsPerPage) * _itemLength;
   }
 
   int getPage(int index, int viewLength) {
-    return (getOffset(index) / getPageLength(viewLength)).floor().toInt();
+    return getOffset(index) ~/ getPageLength(viewLength);
   }
 
   int getPageStartIndex(int page, int viewLength) {
-    return (getPageLength(viewLength) / _itemLength).toInt() * page;
+    return getPageLength(viewLength) ~/ _itemLength * page;
   }
 
   int getSnapIndex(num offset, int viewLength) {
-    int index = (-offset / _itemLength).round().toInt();
+    int index = (-offset / _itemLength).round();
     if (_paginate) {
       index = getPageStartIndex(getPage(index, viewLength), viewLength);
     }
     return GoogleMath.clamp(index, 0, _data.length - 1);
   }
 
   Interval computeVisibleInterval(
       num offset, num viewLength, num bufferLength) {
     int targetIntervalStart =
         Math.max(0, (-offset - bufferLength) ~/ _itemLength);
@@ skipping 279 matching lines @@
 
     container = node.query('.dialog-body');
     container.nodes.add(_content.node);
 
     return node;
   }
 
   /** Override to handle dialog done. */
   void onDone() { }
 }