/// <summary>
/// 设置TimelineItem的位置属性
/// </summary>
/// <param name="index"></param>
private void SetTimelineItem(int index)
{
if (index > this.Items.Count || index < 0)
{
return;
}
CollectionlineItem timelineItem = this.ItemContainerGenerator.ContainerFromIndex(index) as CollectionlineItem;
if (timelineItem == null)
{
return;
}
ShowTitleItem(index);
timelineItem.IsFirstItem = index == 0;
timelineItem.IsLastItem = index == this.Items.Count - 1;
timelineItem.IsMiddleItem = index > 0 && index < this.Items.Count - 1;
}
protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
{
int index = this.ItemContainerGenerator.IndexFromContainer(element);
CollectionlineItem timelineItem = element as CollectionlineItem;
if (timelineItem == null)
{
return;
}
if (index == 0)
{
timelineItem.IsFirstItem = true;
}
if (index == this.Items.Count - 1)
{
timelineItem.IsLastItem = true;
}
ShowTitleItem(index);
base.PrepareContainerForItemOverride(timelineItem, item);
}