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Merge pull request #3 from letsar/feature/2_percentage_observer
Fix issue #2
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| import 'package:flutter/rendering.dart'; | ||
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| /// Immutable layout constraints for sticky header | ||
| class StickyHeaderConstraints extends BoxConstraints { | ||
| StickyHeaderConstraints({ | ||
| this.scrollPercentage, | ||
| BoxConstraints boxConstraints, | ||
| }) : assert(scrollPercentage != null), | ||
| assert(boxConstraints != null), | ||
| super( | ||
| minWidth: boxConstraints.minWidth, | ||
| maxWidth: boxConstraints.maxWidth, | ||
| minHeight: boxConstraints.minHeight, | ||
| maxHeight: boxConstraints.maxHeight, | ||
| ); | ||
|
|
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| final double scrollPercentage; | ||
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| @override | ||
| bool get isNormalized => | ||
| scrollPercentage >= 0.0 && scrollPercentage <= 1.0 && super.isNormalized; | ||
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| @override | ||
| bool operator ==(dynamic other) { | ||
| assert(debugAssertIsValid()); | ||
| if (identical(this, other)) return true; | ||
| if (other is! StickyHeaderConstraints) return false; | ||
| final StickyHeaderConstraints typedOther = other; | ||
| assert(typedOther.debugAssertIsValid()); | ||
| return scrollPercentage == typedOther.scrollPercentage && | ||
| minWidth == typedOther.minWidth && | ||
| maxWidth == typedOther.maxWidth && | ||
| minHeight == typedOther.minHeight && | ||
| maxHeight == typedOther.maxHeight; | ||
| } | ||
|
|
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| @override | ||
| int get hashCode { | ||
| assert(debugAssertIsValid()); | ||
| return hashValues( | ||
| minWidth, maxWidth, minHeight, maxHeight, scrollPercentage); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| import 'package:flutter/rendering.dart'; | ||
| import 'package:flutter/widgets.dart'; | ||
| import 'package:flutter_sticky_header/src/rendering/sticky_header_constraints.dart'; | ||
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| class RenderStickyHeaderLayoutBuilder extends RenderBox | ||
| with RenderObjectWithChildMixin<RenderBox> { | ||
| RenderStickyHeaderLayoutBuilder({ | ||
| LayoutCallback<StickyHeaderConstraints> callback, | ||
| }) : _callback = callback; | ||
|
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| LayoutCallback<StickyHeaderConstraints> get callback => _callback; | ||
| LayoutCallback<StickyHeaderConstraints> _callback; | ||
| set callback(LayoutCallback<StickyHeaderConstraints> value) { | ||
| if (value == _callback) return; | ||
| _callback = value; | ||
| markNeedsLayout(); | ||
| } | ||
|
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| // layout input | ||
| @override | ||
| StickyHeaderConstraints get constraints => super.constraints; | ||
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| bool _debugThrowIfNotCheckingIntrinsics() { | ||
| assert(() { | ||
| if (!RenderObject.debugCheckingIntrinsics) { | ||
| throw new FlutterError( | ||
| 'StickyHeaderLayoutBuilder does not support returning intrinsic dimensions.\n' | ||
| 'Calculating the intrinsic dimensions would require running the layout ' | ||
| 'callback speculatively, which might mutate the live render object tree.'); | ||
| } | ||
| return true; | ||
| }()); | ||
| return true; | ||
| } | ||
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| @override | ||
| double computeMinIntrinsicWidth(double height) { | ||
| assert(_debugThrowIfNotCheckingIntrinsics()); | ||
| return 0.0; | ||
| } | ||
|
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| @override | ||
| double computeMaxIntrinsicWidth(double height) { | ||
| assert(_debugThrowIfNotCheckingIntrinsics()); | ||
| return 0.0; | ||
| } | ||
|
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| @override | ||
| double computeMinIntrinsicHeight(double width) { | ||
| assert(_debugThrowIfNotCheckingIntrinsics()); | ||
| return 0.0; | ||
| } | ||
|
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||
| @override | ||
| double computeMaxIntrinsicHeight(double width) { | ||
| assert(_debugThrowIfNotCheckingIntrinsics()); | ||
| return 0.0; | ||
| } | ||
|
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| @override | ||
| void performLayout() { | ||
| assert(callback != null); | ||
| invokeLayoutCallback(callback); | ||
| if (child != null) { | ||
| child.layout(constraints, parentUsesSize: true); | ||
| size = constraints.constrain(child.size); | ||
| } else { | ||
| size = constraints.biggest; | ||
| } | ||
| } | ||
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| @override | ||
| bool hitTestChildren(HitTestResult result, {Offset position}) { | ||
| return child?.hitTest(result, position: position) ?? false; | ||
| } | ||
|
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| @override | ||
| void paint(PaintingContext context, Offset offset) { | ||
| if (child != null) context.paintChild(child, offset); | ||
| } | ||
| } |
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