/// <summary>
/// Calculates the max count of visible items.
/// </summary>
protected override void CalculateMaxVisibleItems()
{
var spacing_x = GetItemSpacingX();
var spacing_y = GetItemSpacingY();
var height = scrollHeight + spacing_y - LayoutBridge.GetFullMarginY();
var width = scrollWidth + spacing_x - LayoutBridge.GetFullMarginX();
if (IsHorizontal())
{
ItemsPerRow = Mathf.CeilToInt(width / (itemWidth + spacing_x)) + 1;
ItemsPerRow = Mathf.Max(2, ItemsPerRow);
ItemsPerColumn = Mathf.FloorToInt(height / (itemHeight + spacing_y));
ItemsPerColumn = Mathf.Max(1, ItemsPerColumn);
ItemsPerColumn = LayoutBridge.ColumnsConstraint(ItemsPerColumn);
}
else
{
ItemsPerRow = Mathf.FloorToInt(width / (itemWidth + spacing_x));
ItemsPerRow = Mathf.Max(1, ItemsPerRow);
ItemsPerRow = LayoutBridge.RowsConstraint(ItemsPerRow);
ItemsPerColumn = Mathf.CeilToInt(height / (itemHeight + spacing_y)) + 1;
ItemsPerColumn = Mathf.Max(2, ItemsPerColumn);
}
maxVisibleItems = ItemsPerRow * ItemsPerColumn;
}
/// <summary>
/// Get secondary scroll position (for the cross direction).
/// </summary>
/// <param name="index">Index.</param>
/// <returns>Secondary scroll position.</returns>
protected override float GetScrollPositionSecondary(int index)
{
if (IsVirtualizationSupported())
{
var scroll_value = IsHorizontal() ? ScrollRectSize.y : ScrollRectSize.x;
var item_size = ListRenderer.CalculateSize(index);
var item_value = IsHorizontal()
? (item_size.y + LayoutBridge.GetFullMarginY())
: (item_size.x + LayoutBridge.GetFullMarginX());
if (scroll_value >= item_value)
{
return(base.GetScrollPositionSecondary(index));
}
}
var value = GetNodeIndentation(index);
return(IsHorizontal() ? value : -value);
}
/// <summary>
/// Calculates the max count of visible items.
/// </summary>
protected override void CalculateMaxVisibleItems()
{
CalculateItemsSizes(DataSource, false);
var lowest_width = ItemSizes.Count > 0 ? ItemSizes.Values.Min(x => x.x) : 1;
var lowest_height = ItemSizes.Count > 0 ? ItemSizes.Values.Min(x => x.y) : 1;
var spacing_x = GetItemSpacingX();
var spacing_y = GetItemSpacingY();
var height = scrollHeight + spacing_y - LayoutBridge.GetFullMarginY();
var width = scrollWidth + spacing_x - LayoutBridge.GetFullMarginX();
if (IsHorizontal())
{
ItemsPerColumn = Mathf.FloorToInt(height / (lowest_height + spacing_y));
ItemsPerColumn = Mathf.Max(1, ItemsPerColumn);
ItemsPerColumn = LayoutBridge.ColumnsConstraint(ItemsPerColumn);
CalculateBlockSizes(ItemsPerColumn);
ItemsPerRow = RequiredBlocksCount(width) + 1;
ItemsPerRow = Mathf.Max(2, ItemsPerRow);
}
else
{
ItemsPerRow = Mathf.FloorToInt(width / (lowest_width + spacing_x));
ItemsPerRow = Mathf.Max(1, ItemsPerRow);
ItemsPerRow = LayoutBridge.RowsConstraint(ItemsPerRow);
CalculateBlockSizes(ItemsPerRow);
ItemsPerColumn = RequiredBlocksCount(height) + 1;
ItemsPerColumn = Mathf.Max(2, ItemsPerColumn);
}
maxVisibleItems = ItemsPerRow * ItemsPerColumn;
}