Scrollable TabBar Version 0

sky/sdk/lib/widgets/scrollable.dart

Index: sky/sdk/lib/widgets/scrollable.dart
diff --git a/sky/sdk/lib/widgets/scrollable.dart b/sky/sdk/lib/widgets/scrollable.dart
index 3e9c924880dcf2d0fc2b32bff14f0f0d83cafe67..237df4e37ff81a51ce4be05309b016507f248499 100644
--- a/sky/sdk/lib/widgets/scrollable.dart
+++ b/sky/sdk/lib/widgets/scrollable.dart
@@ -17,24 +17,31 @@ import 'theme.dart';
 
 const double _kMillisecondsPerSecond = 1000.0;
 
-double _velocityForFlingGesture(sky.GestureEvent event) {
+double _velocityForFlingGesture(double eventVelocity) {
   return math.max(-config.kMaxFlingVelocity, math.min(config.kMaxFlingVelocity,
-      -event.velocityY)) / _kMillisecondsPerSecond;
+      eventVelocity)) / _kMillisecondsPerSecond;
 }

[abarth-chromium, 2015/07/02 15:27:21]

eventVelocity.clamp(-config.kMaxFlingVelocity, config.kMaxFlingVelocity) /
_kMillisecondsPerSecond

[hansmuller, 2015/07/06 17:21:46]

Done.

 
 abstract class ScrollClient {
   bool ancestorScrolled(Scrollable ancestor);
 }
 
+enum ScrollDirection { vertical, horizontal }
+
 abstract class Scrollable extends Component {
 
-  Scrollable({ String key, Color this.backgroundColor })
-    : super(key: key, stateful: true);
+  Scrollable({
+   String key,
+   this.backgroundColor,
+   this.direction: ScrollDirection.vertical
+  }) : super(key: key, stateful: true);
 
   Color backgroundColor;
+  ScrollDirection direction;
 
   void syncFields(Scrollable source) {
     backgroundColor = source.backgroundColor;
+    direction == source.direction;
   }
 
   Color get _nonNullBackgroundColor {
@@ -159,11 +166,14 @@ abstract class Scrollable extends Component {
   }
 
   void _handleScrollUpdate(sky.GestureEvent event) {
-    scrollBy(-event.dy);
+    scrollBy(direction == ScrollDirection.horizontal ? event.dx : -event.dy);
   }
 
   void _handleFlingStart(sky.GestureEvent event) {
-    _startSimulation(_createParticle(_velocityForFlingGesture(event)));
+    double eventVelocity = direction == ScrollDirection.horizontal
+      ? -event.velocityX
+      : -event.velocityY;
+    _startSimulation(_createParticle(_velocityForFlingGesture(eventVelocity)));
   }
 
   void _handleFlingCancel(sky.GestureEvent event) {