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Merge pull request #514 from abarth/list_repaint

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Make stocks list scrolling 2x faster on the main thread
This commit is contained in:
Adam Barth 2015-11-20 10:35:37 -08:00
commit c423f734ab
2 changed files with 4 additions and 1 deletions
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1
packages/flutter/lib/src/rendering/block.dart
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@ -255,6 +255,7 @@ class RenderBlockViewport extends RenderBlockBase {
super(children: children, direction: direction, itemExtent: itemExtent, minExtent: minExtent);
bool _inCallback = false;
bool get hasLayer => true;
/// Called during [layout] to determine the blocks children
///

4
packages/flutter/lib/src/widgets/homogeneous_viewport.dart
View File

@ -148,7 +148,9 @@ class _HomogeneousViewportElement extends RenderObjectElement<HomogeneousViewpor
assert(_layoutItemCount != null);
List<Widget> newWidgets;
if (_layoutItemCount > 0)
newWidgets = widget.builder(this, _layoutFirstIndex, _layoutItemCount);
newWidgets = widget.builder(this, _layoutFirstIndex, _layoutItemCount).map((Widget widget) {
return new RepaintBoundary(key: new ValueKey<Key>(widget.key), child: widget);
}).toList();
else
newWidgets = <Widget>[];
_children = updateChildren(_children, newWidgets);