performHorizontalIntrinsicLayout method

@override AxisConfiguration<int> performHorizontalIntrinsicLayout({ required Map<int, double> childrenWidths, bool isComputingIntrinsics = false, })

Implementation

@override
AxisConfiguration<int> performHorizontalIntrinsicLayout({
  required Map<int, double> childrenWidths,
  bool isComputingIntrinsics = false,
}) {
  final childWidths = List.generate(
      cols * rows, (index) => childrenWidths[index] ?? 0.0,
      growable: false);

  // Calculate width for each column
  final colWidths = List.filled(cols, 0.0, growable: false);
  for (var i = 0; i < cols; i++) {
    for (var j = 0; j < rows; j++) {
      colWidths[i] = math.max(
        colWidths[i],
        childWidths[j * cols + i],
      );
    }
  }

  // Layout each column
  final colPos = List.filled(cols, 0.0, growable: false);
  final vLinePos = List.filled(cols + 1, 0.0, growable: false);

  var pos = 0.0;
  vLinePos[0] = pos;
  pos += (vLines[0] != MatrixSeparatorStyle.none) ? ruleThickness : 0.0;
  pos += hskipBeforeAndAfter ? arraycolsep : 0.0;

  for (var i = 0; i < cols - 1; i++) {
    colPos[i] = pos;
    pos += colWidths[i] + arraycolsep;
    vLinePos[i + 1] = pos;
    pos += (vLines[i + 1] != MatrixSeparatorStyle.none) ? ruleThickness : 0.0;
    pos += arraycolsep;
  }

  colPos[cols - 1] = pos;
  pos += colWidths[cols - 1];
  pos += hskipBeforeAndAfter ? arraycolsep : 0.0;
  vLinePos[cols] = pos;
  pos += (vLines[cols] != MatrixSeparatorStyle.none) ? ruleThickness : 0.0;

  width = pos;

  // Determine position of children
  final childPos = List.generate(rows * cols, (index) {
    final col = index % cols;
    switch (columnAligns[col]) {
      case MatrixColumnAlign.left:
        return colPos[col];
      case MatrixColumnAlign.right:
        return colPos[col] + colWidths[col] - childWidths[index];
      case MatrixColumnAlign.center:
      default:
        return colPos[col] + (colWidths[col] - childWidths[index]) / 2;
    }
  }, growable: false);

  if (!isComputingIntrinsics) {
    this.vLinePos = vLinePos;
  }

  return AxisConfiguration(
    size: width,
    offsetTable: childPos.asMap(),
  );
}