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Allow derived classes of Scrollable to listen for scroll events

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This commit is contained in:
Collin Jackson 2015-10-12 16:10:46 -07:00
parent 909716956e
commit 477a54c375
1 changed files with 7 additions and 2 deletions
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9
packages/flutter/lib/src/widgets/scrollable.dart
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@ -166,8 +166,7 @@ abstract class ScrollableState<T extends Scrollable> extends State<T> {
setState(() {
_scrollOffset = newScrollOffset;
});
if (config.onScroll != null)
config.onScroll(_scrollOffset);
dispatchOnScroll();
}
Future scrollTo(double newScrollOffset, { Duration duration, Curve curve: ease }) {
@ -200,6 +199,12 @@ abstract class ScrollableState<T extends Scrollable> extends State<T> {
return _startToEndAnimation();
}
// Derived classes can override this method and call super.dispatchOnScroll()
void dispatchOnScroll() {
if (config.onScroll != null)
config.onScroll(_scrollOffset);
}
double _scrollVelocity(ui.Offset velocity) {
double scrollVelocity = config.scrollDirection == ScrollDirection.horizontal
? -velocity.dx