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Cleanup around viewports

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This commit is contained in:
Hixie 2016-03-07 10:26:24 -08:00
parent 8a2865ced3
commit 79c3905eb6
2 changed files with 17 additions and 1 deletions
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13
packages/flutter/lib/src/rendering/viewport.dart
View File

@ -195,6 +195,14 @@ class RenderViewportBase extends RenderBox implements HasScrollDirection {
super.applyPaintTransform(child, transform.translate(effectivePaintOffset.dx, effectivePaintOffset.dy));
}
void debugFillDescription(List<String> description) {
super.debugFillDescription(description);
description.add('paintOffset: $paintOffset');
description.add('scrollDirection: $scrollDirection');
description.add('scrollAnchor: $scrollAnchor');
if (overlayPainter != null)
description.add('overlay painter: $overlayPainter');
}
}
typedef Offset ViewportDimensionsChangeCallback(ViewportDimensions dimensions);
@ -373,4 +381,9 @@ abstract class RenderVirtualViewport<T extends ContainerBoxParentDataMixin<Rende
}
Rect describeApproximatePaintClip(RenderObject child) => Point.origin & size;
void debugFillDescription(List<String> description) {
super.debugFillDescription(description);
description.add('virtual child count: $virtualChildCount');
}
}

5
packages/flutter/lib/src/widgets/scroll_behavior.dart
View File

@ -71,6 +71,7 @@ abstract class ExtentScrollBehavior extends ScrollBehavior<double, double> {
double containerExtent,
double scrollOffset: 0.0
}) {
assert(minScrollOffset <= maxScrollOffset);
if (contentExtent != null)
_contentExtent = contentExtent;
if (containerExtent != null)
@ -109,8 +110,10 @@ class BoundedBehavior extends ExtentScrollBehavior {
double minScrollOffset,
double scrollOffset: 0.0
}) {
if (minScrollOffset != null)
if (minScrollOffset != null) {
_minScrollOffset = minScrollOffset;
assert(minScrollOffset <= maxScrollOffset);
}
return super.updateExtents(
contentExtent: contentExtent,
containerExtent: containerExtent,