Source Code added

mobile/lib/presentation/widgets/timeline/fixed/row.dart

@@ -0,0 +1,149 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart';
+
+class FixedTimelineRow extends MultiChildRenderObjectWidget {
+  final double dimension;
+  final double spacing;
+  final TextDirection textDirection;
+
+  const FixedTimelineRow({
+    super.key,
+    required this.dimension,
+    required this.spacing,
+    required this.textDirection,
+    required super.children,
+  });
+
+  @override
+  RenderObject createRenderObject(BuildContext context) {
+    return RenderFixedRow(dimension: dimension, spacing: spacing, textDirection: textDirection);
+  }
+
+  @override
+  void updateRenderObject(BuildContext context, RenderFixedRow renderObject) {
+    renderObject.dimension = dimension;
+    renderObject.spacing = spacing;
+    renderObject.textDirection = textDirection;
+  }
+
+  @override
+  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
+    super.debugFillProperties(properties);
+    properties.add(DoubleProperty('dimension', dimension));
+    properties.add(DoubleProperty('spacing', spacing));
+    properties.add(EnumProperty<TextDirection>('textDirection', textDirection));
+  }
+}
+
+class _RowParentData extends ContainerBoxParentData<RenderBox> {}
+
+class RenderFixedRow extends RenderBox
+    with
+        ContainerRenderObjectMixin<RenderBox, _RowParentData>,
+        RenderBoxContainerDefaultsMixin<RenderBox, _RowParentData> {
+  RenderFixedRow({
+    List<RenderBox>? children,
+    required double dimension,
+    required double spacing,
+    required TextDirection textDirection,
+  }) : _dimension = dimension,
+       _spacing = spacing,
+       _textDirection = textDirection {
+    addAll(children);
+  }
+
+  double get dimension => _dimension;
+  double _dimension;
+
+  set dimension(double value) {
+    if (_dimension == value) return;
+    _dimension = value;
+    markNeedsLayout();
+  }
+
+  double get spacing => _spacing;
+  double _spacing;
+
+  set spacing(double value) {
+    if (_spacing == value) return;
+    _spacing = value;
+    markNeedsLayout();
+  }
+
+  TextDirection get textDirection => _textDirection;
+  TextDirection _textDirection;
+
+  set textDirection(TextDirection value) {
+    if (_textDirection == value) return;
+    _textDirection = value;
+    markNeedsLayout();
+  }
+
+  @override
+  void setupParentData(RenderBox child) {
+    if (child.parentData is! _RowParentData) {
+      child.parentData = _RowParentData();
+    }
+  }
+
+  double get intrinsicWidth => dimension * childCount + spacing * (childCount - 1);
+
+  @override
+  double computeMinIntrinsicWidth(double height) => intrinsicWidth;
+
+  @override
+  double computeMaxIntrinsicWidth(double height) => intrinsicWidth;
+
+  @override
+  double computeMinIntrinsicHeight(double width) => dimension;
+
+  @override
+  double computeMaxIntrinsicHeight(double width) => dimension;
+
+  @override
+  double? computeDistanceToActualBaseline(TextBaseline baseline) {
+    return defaultComputeDistanceToHighestActualBaseline(baseline);
+  }
+
+  @override
+  bool hitTestChildren(BoxHitTestResult result, {required Offset position}) {
+    return defaultHitTestChildren(result, position: position);
+  }
+
+  @override
+  void paint(PaintingContext context, Offset offset) {
+    defaultPaint(context, offset);
+  }
+
+  @override
+  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
+    super.debugFillProperties(properties);
+    properties.add(DoubleProperty('dimension', dimension));
+    properties.add(DoubleProperty('spacing', spacing));
+    properties.add(EnumProperty<TextDirection>('textDirection', textDirection));
+  }
+
+  @override
+  void performLayout() {
+    RenderBox? child = firstChild;
+    if (child == null) {
+      size = constraints.smallest;
+      return;
+    }
+    // Use the entire width of the parent for the row.
+    size = Size(constraints.maxWidth, dimension);
+    // Each tile is forced to be dimension x dimension.
+    final childConstraints = BoxConstraints.tight(Size(dimension, dimension));
+    final flipMainAxis = textDirection == TextDirection.rtl;
+    Offset offset = Offset(flipMainAxis ? size.width - dimension : 0, 0);
+    final dx = (flipMainAxis ? -1 : 1) * (dimension + spacing);
+    // Layout each child horizontally.
+    while (child != null) {
+      child.layout(childConstraints, parentUsesSize: false);
+      final childParentData = child.parentData! as _RowParentData;
+      childParentData.offset = offset;
+      offset += Offset(dx, 0);
+      child = childParentData.nextSibling;
+    }
+  }
+}