Hide entity history and attributes under expandepble card

lib/plugins/dynamic_multi_column_layout.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart';
+import 'dart:math' as math;
+
+class DynamicMultiColumnLayout extends MultiChildRenderObjectWidget {
+
+  final int minColumnWidth;
+
+  DynamicMultiColumnLayout({
+    Key key,
+    this.minColumnWidth: 350,
+    List<Widget> children = const <Widget>[],
+  }) : super(key: key, children: children);
+
+  @override
+  RenderCustomLayoutBox createRenderObject(BuildContext context) {
+    return RenderCustomLayoutBox(minColumnWidth: this.minColumnWidth);
+  }
+
+}
+
+class RenderCustomLayoutBox extends RenderBox
+    with ContainerRenderObjectMixin<RenderBox, CustomLayoutParentData>,
+        RenderBoxContainerDefaultsMixin<RenderBox, CustomLayoutParentData> {
+
+  final int minColumnWidth;
+
+  RenderCustomLayoutBox({
+    this.minColumnWidth,
+    List<RenderBox> children,
+  }) {
+    addAll(children);
+  }
+
+  @override
+  void setupParentData(RenderBox child) {
+    if (child.parentData is! CustomLayoutParentData) {
+      child.parentData = CustomLayoutParentData();
+    }
+  }
+
+  double _getIntrinsicHeight(double childSize(RenderBox child)) {
+    double inflexibleSpace = 0.0;
+    RenderBox child = firstChild;
+    while (child != null) {
+      inflexibleSpace += childSize(child);
+      final FlexParentData childParentData = child.parentData;
+      child = childParentData.nextSibling;
+    }
+    return inflexibleSpace;
+  }
+
+  double _getIntrinsicWidth(double childSize(RenderBox child)) {
+    double maxSpace = 0.0;
+    RenderBox child = firstChild;
+    while (child != null) {
+      maxSpace = math.max(maxSpace, childSize(child));
+      final FlexParentData childParentData = child.parentData;
+      child = childParentData.nextSibling;
+    }
+    return maxSpace;
+  }
+
+  @override
+  double computeMinIntrinsicWidth(double height) {
+    return _getIntrinsicWidth((RenderBox child) => child.getMinIntrinsicWidth(height));
+  }
+
+  @override
+  double computeMaxIntrinsicWidth(double height) {
+    return _getIntrinsicWidth((RenderBox child) => child.getMaxIntrinsicWidth(height));
+  }
+
+  @override
+  double computeMinIntrinsicHeight(double width) {
+    return _getIntrinsicHeight((RenderBox child) => child.getMinIntrinsicHeight(width));
+  }
+
+  @override
+  double computeMaxIntrinsicHeight(double width) {
+    return _getIntrinsicHeight((RenderBox child) => child.getMaxIntrinsicHeight(width));
+  }
+
+  @override
+  void performLayout() {
+    int columnsCount;
+    List<double> columnXPositions = [];
+    List<double> columnYPositions = [];
+    columnsCount = (constraints.maxWidth ~/ this.minColumnWidth);
+    if (childCount == 0 || columnsCount == 0) {
+      size = constraints.biggest;
+      assert(size.isFinite);
+      return;
+    }
+    double columnWidth = constraints.maxWidth / columnsCount;
+    double startY = 0;
+    for (int i =0; i < columnsCount; i++) {
+      columnXPositions.add(i*columnWidth);
+      columnYPositions.add(startY);
+    }
+    RenderBox child = firstChild;
+    while (child != null) {
+      final CustomLayoutParentData childParentData = child.parentData;
+
+      int columnToAdd = 0;
+      double minYPosition = columnYPositions[0];
+      for (int i=0; i<columnsCount; i++) {
+        if (columnYPositions[i] < minYPosition) {
+          minYPosition = columnYPositions[i];
+          columnToAdd = i;
+        }
+      }
+      child.layout(BoxConstraints.tightFor(width: columnWidth), parentUsesSize: true);
+      childParentData.offset = Offset(columnXPositions[columnToAdd], columnYPositions[columnToAdd]);
+      final Size newSize = child.size;
+      columnYPositions[columnToAdd] = minYPosition + newSize.height;
+
+      child = childParentData.nextSibling;
+    }
+
+    double width = constraints.maxWidth;
+    double height = 0;
+    for (int i=0; i<columnsCount; i++) {
+      if (columnYPositions[i] > height) {
+        height = columnYPositions[i];
+      }
+    }
+
+    size = Size(width, height);
+  }
+
+  @override
+  void paint(PaintingContext context, Offset offset) {
+    defaultPaint(context, offset);
+  }
+
+  @override
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
+    return defaultHitTestChildren(result, position: position);
+  }
+}
+
+class CustomLayoutParentData extends ContainerBoxParentData<RenderBox> {
+
+}