PageView.builder constructor

PageView.builder({Key key, Axis scrollDirection: Axis.horizontal, bool reverse: false, PageController controller, ScrollPhysics physics, bool pageSnapping: true, ValueChanged<int> onPageChanged, @required IndexedWidgetBuilder itemBuilder, int itemCount, DragStartBehavior dragStartBehavior: DragStartBehavior.start })

Creates a scrollable list that works page by page using widgets that are created on demand.

This constructor is appropriate for page views with a large (or infinite) number of children because the builder is called only for those children that are actually visible.

Providing a non-null itemCount lets the PageView compute the maximum scroll extent.

itemBuilder will be called only with indices greater than or equal to zero and less than itemCount.

PageView.builder by default does not support child reordering. If you are planning to change child order at a later time, consider using PageView or PageView.custom.

Implementation

PageView.builder({
  Key key,
  this.scrollDirection = Axis.horizontal,
  this.reverse = false,
  PageController controller,
  this.physics,
  this.pageSnapping = true,
  this.onPageChanged,
  @required IndexedWidgetBuilder itemBuilder,
  int itemCount,
  this.dragStartBehavior = DragStartBehavior.start,
}) : controller = controller ?? _defaultPageController,
     childrenDelegate = SliverChildBuilderDelegate(itemBuilder, childCount: itemCount),
     super(key: key);