103 lines
3.6 KiB
C#
103 lines
3.6 KiB
C#
using UnityEngine;
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namespace AlicizaX.UI.RecyclerView
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{
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public class LinearLayoutManager : LayoutManager
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{
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protected float lineHeight;
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public LinearLayoutManager() { }
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public override Vector2 CalculateContentSize()
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{
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Vector2 size = viewProvider.CalculateViewSize(0);
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lineHeight = direction == Direction.Vertical ? size.y : size.x;
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int index = adapter.GetItemCount();
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float position;
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if (direction == Direction.Vertical)
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{
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position = index * (lineHeight + spacing.y) - spacing.y;
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return new Vector2(contentSize.x, position + padding.y * 2);
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}
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position = index * (lineHeight + spacing.x) - spacing.x;
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return new Vector2(position + padding.x * 2, contentSize.y);
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}
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public override Vector2 CalculatePosition(int index)
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{
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float position;
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if (direction == Direction.Vertical)
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{
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position = index * (lineHeight + spacing.y) - ScrollPosition;
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return new Vector2(0, position + padding.y);
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}
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position = index * (lineHeight + spacing.x) - ScrollPosition;
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return new Vector2(position + padding.x, 0);
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}
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public override Vector2 CalculateContentOffset()
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{
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float len = GetFitContentSize();
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if (direction == Direction.Vertical)
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{
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return new Vector2(0, (len - lineHeight) / 2);
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}
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return new Vector2((len - lineHeight) / 2, 0);
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}
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public override Vector2 CalculateViewportOffset()
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{
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if (direction == Direction.Vertical)
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{
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return new Vector2(0, (viewportSize.y - lineHeight) / 2);
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}
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return new Vector2((viewportSize.x - lineHeight) / 2, 0);
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}
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public override int GetStartIndex()
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{
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float len = direction == Direction.Vertical ? lineHeight + spacing.y : lineHeight + spacing.x;
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int index = Mathf.FloorToInt(ScrollPosition / len);
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return Mathf.Max(0, index);
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}
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public override int GetEndIndex()
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{
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float viewLength = direction == Direction.Vertical ? viewportSize.y : viewportSize.x;
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float len = direction == Direction.Vertical ? lineHeight + spacing.y : lineHeight + spacing.x;
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int index = Mathf.FloorToInt((ScrollPosition + viewLength) / len);
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return Mathf.Min(index, adapter.GetItemCount() - 1);
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}
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public override float IndexToPosition(int index)
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{
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if (index < 0 || index >= adapter.GetItemCount()) return 0;
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float len, viewLength, position;
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if (direction == Direction.Vertical)
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{
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len = index * (lineHeight + spacing.y);
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viewLength = viewportSize.y;
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position = len + viewLength > contentSize.y ? contentSize.y - viewportSize.y : len;
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}
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else
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{
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len = index * (lineHeight + spacing.x);
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viewLength = viewportSize.x;
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position = len + viewLength > contentSize.x ? contentSize.x - viewportSize.x : len;
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}
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return position;
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}
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public override int PositionToIndex(float position)
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{
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float len = direction == Direction.Vertical ? lineHeight + spacing.y : lineHeight + spacing.x;
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int index = Mathf.RoundToInt(position / len);
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return index;
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}
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}
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}
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