calculateVerticalLayoutData method

List<VerticalLayoutData> calculateVerticalLayoutData(Size size)

Vertical layout of the events.

Calculates the top and bottom of each event, and ensues that they are within the bounds of the widget.

size - The size of the widget.

Implementation

List<VerticalLayoutData> calculateVerticalLayoutData(Size size) {
  final numberOfChildren = events.length;
  final currentCache = <int, VerticalLayoutData>{};
  final cache = layoutCache.getCache(date, heightPerMinute, timeOfDayRange);

  // Collected per child rather than read back out of the cache. The cache is keyed by event hash, so two equal events
  // share one entry, and using its values as the result would leave a child with no layout data at all.
  final layoutData = <VerticalLayoutData>[];

  for (var i = 0; i < numberOfChildren; i++) {
    final event = events.elementAt(i);
    final eventHash = event.hashCode;

    final cached = cache?[eventHash];
    final data = cached == null ? _calculateSingleEventLayout(i, size, event) : cached.copyWith(id: i);

    layoutData.add(data);
    currentCache[eventHash] = data;
  }

  layoutCache.setCache(date, heightPerMinute, timeOfDayRange, currentCache);
  return sortVerticalLayoutData(layoutData);
}