/// <summary>
/// Total height of items before and with specified index.
/// </summary>
/// <returns>The <see cref="System.Single"/>.</returns>
/// <param name="index">Index.</param>
float ItemEndAt(int index)
{
var height = DataSource.GetRange(0, index + 1).SumFloat(GetItemHeight);
return(height + (LayoutBridge.GetSpacing() * index));
}
/// <summary>
/// Gets the item position bottom.
/// </summary>
/// <returns>The item position bottom.</returns>
/// <param name="index">Index.</param>
public override float GetItemPositionBottom(int index)
{
return(GetItemPosition(index) + DataSource[index].Height - LayoutBridge.GetSpacing() + LayoutBridge.GetMargin() - GetScrollSize());
}
/// <summary>
/// Gets the item position.
/// </summary>
/// <returns>The item position.</returns>
/// <param name="index">Index.</param>
public override float GetItemPosition(int index)
{
return(Mathf.Max(0, DataSource.GetRange(0, index).SumFloat(GetItemHeight) + (LayoutBridge.GetSpacing() * (index - 1))));
}
/// <summary>
/// Gets the item position bottom.
/// </summary>
/// <returns>The item position bottom.</returns>
/// <param name="index">Index.</param>
public override float GetItemPositionBottom(int index)
{
var block = Mathf.Min(GetBlockIndex(index) + 1, BlockSizes.Count);
return(BlockSizes.GetRange(0, block).SumFloat() + (LayoutBridge.GetSpacing() * (block - 1)) + LayoutBridge.GetMargin() - GetScrollSize());
}
/// <summary>
/// Gets the item position.
/// </summary>
/// <returns>The item position.</returns>
/// <param name="index">Index.</param>
public override float GetItemPosition(int index)
{
var block = GetBlockIndex(index);
return(BlockSizes.GetRange(0, block).SumFloat() + (LayoutBridge.GetSpacing() * block));
}
/// <summary>
/// Gets the index of the nearest item.
/// </summary>
/// <returns>The nearest item index.</returns>
/// <param name="point">Point.</param>
public override int GetNearestIndex(Vector2 point)
{
if (IsSortEnabled())
{
return(-1);
}
// block index
var pos_block = IsHorizontal() ? point.x : -point.y;
var block = Mathf.RoundToInt(pos_block / GetItemSize());
// item index in block
var pos_elem = IsHorizontal() ? -point.y : point.x;
var size = (IsHorizontal()) ? itemHeight + LayoutBridge.GetSpacing() : itemWidth + LayoutBridge.GetSpacing();
var k = Mathf.FloorToInt(pos_elem / size);
return(block * GetItemsPerBlock() + k);
}