public void OnSelectionChanged(object sender, EventItemChangedArgs e)
{
if (OnItemSelectionChanged != null)
{
OnItemSelectionChanged(sender, e);
}
}
/// <summary>
/// Handles when StyleListBoxItem.Selected is changed.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnCollectionItemSelectionChanged(object sender, EventItemChangedArgs e)
{
if (e.Item.Selected)
{
if (SelectionMode == SelectionMode.One)
{
ClearSelected();
}
// from False -> True
itemSelectedList.Add(e.Item);
_selectedIndex = e.Item.Index;
_focusedIndex = e.Item.Index;
}
else
{
// from True -> False
itemSelectedList.Remove(e.Item);
if (_selectedIndex == e.Item.Index)
{
if (itemSelectedList.Count > 0)
{
_selectedIndex = itemSelectedList[itemSelectedList.Count - 1].Index;
_focusedIndex = _selectedIndex;
}
else
{
_selectedIndex = -1;
_focusedIndex = 0;
}
}
}
if (SelectedIndexChanged != null)
{
SelectedIndexChanged(this, new EventArgs());
}
}
public void OnCollectionItemChanged(object sender, EventItemChangedArgs e)
{
int height = e.Item.MeasureItem();
int change = height - itemCacheHeight[e.Item.Index];
itemTotalHeight += change;
itemCacheHeight[e.Item.Index] = height;
// Update last visible item index
if (e.Item.Index < itemFirstVisibleIndex)
{
itemFirstVisibleY += change;
UpdateItemVisibilityByChange(change);
itemLastVisibleIndex = GetLastVisibleItemIndex();
}
else if (e.Item.Index < itemLastVisibleIndex)
{
itemLastVisibleIndex = GetLastVisibleItemIndex();
}
Update();
}