/// <summary>
/// <see cref="SaveListViewScroll"/> によって保存されたスクロール位置を復元します
/// </summary>
private void RestoreListViewScroll(DetailsListView listView, TabModel tab, ListViewScroll listScroll)
{
if (listView.VirtualListSize == 0)
return;
switch (listScroll.ScrollLockMode)
{
case ScrollLockMode.FixedToTop:
listView.EnsureVisible(0);
break;
case ScrollLockMode.FixedToBottom:
listView.EnsureVisible(listView.VirtualListSize - 1);
break;
case ScrollLockMode.FixedToItem:
var topIndex = listScroll.TopItemStatusId != null ? tab.IndexOf(listScroll.TopItemStatusId.Value) : -1;
if (topIndex != -1)
listView.TopItem = listView.Items[topIndex];
break;
case ScrollLockMode.None:
default:
break;
}
}
public App ()
{
// The root page of your application
MainPage = new ListViewScroll();
}
/// <summary>
/// <see cref="ListView"/> のスクロール位置に関する情報を <see cref="ListViewScroll"/> として返します
/// </summary>
private ListViewScroll SaveListViewScroll(DetailsListView listView, TabModel tab)
{
var listScroll = new ListViewScroll
{
ScrollLockMode = this.GetScrollLockMode(listView),
};
if (listScroll.ScrollLockMode == ScrollLockMode.FixedToItem)
{
var topItem = listView.TopItem;
if (topItem != null)
listScroll.TopItemStatusId = tab.GetStatusIdAt(topItem.Index);
}
return listScroll;
}
