layout method

@override void layout(BoxConstraints constraints)

Implementation

@override
void layout(BoxConstraints constraints) {
  super.layout(constraints);

  final maxWidth =
      width ??
      (constraints.hasBoundedWidth
          ? constraints.maxWidth.round()
          : controller.model.width);
  final boundedHeight = constraints.hasBoundedHeight
      ? constraints.maxHeight.round()
      : null;
  final viewportHeight = height ?? boundedHeight;
  final layoutHeight =
      viewportHeight ??
      controller.model.height ??
      controller.model.lines.length;

  var contentWidth = math.max(0, maxWidth);
  var totalWidth = contentWidth;
  _effectiveScrollbar =
      showScrollbar && maxWidth > scrollbarSeparator.length + 1;
  if (_effectiveScrollbar) {
    contentWidth = math.max(1, maxWidth - scrollbarSeparator.length - 1);
    totalWidth = contentWidth + scrollbarSeparator.length + 1;
  }

  controller.setSize(contentWidth, viewportHeight);

  size = constraints.constrain(
    Size(totalWidth.toDouble(), layoutHeight.toDouble()),
  );
}