public override Widget build(BuildContext context, int index)
{
D.assert(builder != null);
if (index < 0 || (childCount != null && index >= childCount))
{
return(null);
}
Widget child = builder(context, index);
if (child == null)
{
return(null);
}
Key key = child.key != null ? new _SaltedValueKey(child.key) : null;
if (addRepaintBoundaries)
{
child = new RepaintBoundary(child: child);
}
if (addAutomaticKeepAlives)
{
child = new AutomaticKeepAlive(child: child);
}
return(new KeyedSubtree(child: child, key: key));
}
public override Widget build(BuildContext context, int index)
{
D.assert(children != null);
if (index < 0 || index >= children.Count)
{
return(null);
}
Widget child = children[index];
D.assert(
child != null, () =>
"The sliver's children must not contain null values, but a null value was found at index $index"
);
Key key = child.key != null? new _SaltedValueKey(child.key) : null;
if (addRepaintBoundaries)
{
child = new RepaintBoundary(child: child);
}
if (addAutomaticKeepAlives)
{
child = new AutomaticKeepAlive(child: child);
}
return(new KeyedSubtree(child: child, key: key));
}
public override Widget build(BuildContext context, int index)
{
D.assert(this.builder != null);
if (index < 0 || (this.childCount != null && index >= this.childCount))
{
return(null);
}
Widget child = this.builder(context, index);
if (child == null)
{
return(null);
}
if (this.addRepaintBoundaries)
{
child = RepaintBoundary.wrap(child, index);
}
if (this.addAutomaticKeepAlives)
{
child = new AutomaticKeepAlive(child: child);
}
return(child);
}
