/// <summary>
/// <see cref="ChildGenerator"/> の新しいインスタンスを生成する。
/// </summary>
/// <param name="owner">アイテムを生成する対象の <see cref="VirtualizingUniformSizeWrapPanel"/>。</param>
public ChildGenerator(VirtualizingUniformSizeWrapPanel owner)
{
this.owner = owner;
// ItemContainerGenerator 取得前に InternalChildren にアクセスしないと null になる
var childrenCount = owner.InternalChildren.Count;
this.generator = owner.ItemContainerGenerator;
// TODO input InternalChildren created child.
// generator=>
// firstGeneratedIndex
// lastGeneratedIndex
var first = int.MaxValue;
var last = -1;
for(int i = 0; i < childrenCount; i++)
{
var childPos = new GeneratorPosition(i, 0);
var index = generator.IndexFromGeneratorPosition(childPos);
first = Math.Min(first, index);
last = Math.Max(last, index);
}
if (first < int.MaxValue)
firstGeneratedIndex = first;
else
firstGeneratedIndex = -1;
if (last >= 0) lastGeneratedIndex = last;
Console.WriteLine("F{0}:L{1}", firstGeneratedIndex, lastGeneratedIndex);
}
public ChildGenerator(VirtualizingUniformSizeWrapPanel owner, int firstIndex, int endIndex)
{
this.owner = owner;
// ItemContainerGenerator 取得前に InternalChildren にアクセスしないと null になる
var childrenCount = owner.InternalChildren.Count;
this.generator = owner.ItemContainerGenerator;
// TODO input InternalChildren created child.
// generator=>
// firstGeneratedIndex
// lastGeneratedIndex
firstGeneratedIndex = firstIndex;
lastGeneratedIndex = endIndex;
// TODO validate
Console.WriteLine("F{0}:L{1}", firstGeneratedIndex, lastGeneratedIndex);
}
