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dirisujesse/sliver_colored_box.dart

Forked from jogboms/sliver_colored_box.dart
Created February 8, 2020 07:46
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Revisions

  1. @jogboms jogboms revised this gist Feb 8, 2020. 1 changed file with 20 additions and 0 deletions.
    20 changes: 20 additions & 0 deletions sliver_colored_box.dart
    View file
    Original file line number Diff line number Diff line change
    @@ -45,6 +45,26 @@ class RenderSliverColoredBox extends RenderSliver with RenderObjectWithChildMixi
    @override
    PhysicalModelLayer get layer => super.layer;

    @override
    void applyPaintTransform(RenderObject child, Matrix4 transform) {
    assert(child != null);
    final SliverPhysicalParentData childParentData = child.parentData;
    childParentData.applyPaintTransform(transform);
    }

    @override
    void visitChildrenForSemantics(RenderObjectVisitor visitor) {
    if (child != null) {
    visitor(child);
    }
    }

    @override
    void debugFillProperties(DiagnosticPropertiesBuilder properties) {
    super.debugFillProperties(properties);
    properties.add(ColorProperty('color', color));
    }

    @override
    void performLayout() {
    assert(child != null);
  2. @jogboms jogboms created this gist Feb 8, 2020.
    86 changes: 86 additions & 0 deletions sliver_colored_box.dart
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,86 @@
    import 'package:flutter/rendering.dart';
    import 'package:flutter/widgets.dart';

    class SliverColoredBox extends SingleChildRenderObjectWidget {
    const SliverColoredBox({
    Key key,
    @required this.color,
    @required Widget sliver,
    }) : super(key: key, child: sliver);

    final Color color;

    @override
    RenderSliverColoredBox createRenderObject(BuildContext context) {
    return RenderSliverColoredBox(color: color);
    }

    @override
    void updateRenderObject(BuildContext context, RenderSliverColoredBox renderObject) {
    renderObject..color = color;
    }
    }

    class RenderSliverColoredBox extends RenderSliver with RenderObjectWithChildMixin<RenderSliver> {
    RenderSliverColoredBox({Color color = const Color(0xFFFFFFFF)})
    : assert(color != null),
    _color = color;

    Color get color => _color;
    Color _color;

    set color(Color value) {
    assert(value != null);
    if (_color == value) {
    return;
    }
    final bool didNeedCompositing = alwaysNeedsCompositing;
    _color = value;
    if (didNeedCompositing != alwaysNeedsCompositing) {
    markNeedsCompositingBitsUpdate();
    }
    markNeedsPaint();
    }

    @override
    PhysicalModelLayer get layer => super.layer;

    @override
    void performLayout() {
    assert(child != null);
    child.layout(constraints, parentUsesSize: true);
    geometry = child.geometry;
    }

    @override
    void setupParentData(RenderObject child) {
    if (child.parentData is! SliverPhysicalParentData) {
    child.parentData = SliverPhysicalParentData();
    }
    }

    @override
    bool hitTestChildren(SliverHitTestResult result, {double mainAxisPosition, double crossAxisPosition}) {
    return child != null &&
    child.geometry.hitTestExtent > 0 &&
    child.hitTest(result, mainAxisPosition: mainAxisPosition, crossAxisPosition: crossAxisPosition);
    }

    @override
    double childMainAxisPosition(RenderSliver child) {
    assert(child != null);
    assert(child == this.child);
    return 0.0;
    }

    @override
    void paint(PaintingContext context, Offset offset) {
    layer ??= PhysicalModelLayer();
    layer
    ..clipPath = (Path()..addRect(offset & getAbsoluteSize()))
    ..elevation = 0.0
    ..color = color
    ..shadowColor = const Color(0x00000000);
    context.pushLayer(layer, child.paint, offset);
    }
    }