72 lines
2.5 KiB
C#
72 lines
2.5 KiB
C#
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using UnityEngine;
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namespace AlicizaX.UI.RecyclerView
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{
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public class AlignableLinearLayoutManager : LinearLayoutManager
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{
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[SerializeField] private float alignmentRatio = 0f; // 对齐比例 (0=顶部, 1=底部, 0.5=居中)
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private float CalculateAlignmentOffset()
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{
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if (direction == Direction.Vertical)
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{
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// 垂直布局：计算视口高度相关的偏移
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float viewportHeight = viewportSize.y;
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float itemHeight = lineHeight;
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return alignmentRatio * (viewportHeight - itemHeight);
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}
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else
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{
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// 水平布局：计算视口宽度相关的偏移
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float viewportWidth = viewportSize.x;
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float itemWidth = lineHeight; // 注意：水平布局中lineHeight表示宽度
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return alignmentRatio * (viewportWidth - itemWidth);
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}
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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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float alignmentOffset = CalculateAlignmentOffset();
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if (direction == Direction.Vertical)
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{
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position = index * (lineHeight + spacing.y) - ScrollPosition + alignmentOffset;
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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 + alignmentOffset;
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var a = new Vector2(position + padding.x, 0);
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Debug.Log("Calcu" + a);
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return a;
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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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float alignmentOffset = CalculateAlignmentOffset();
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if (direction == Direction.Vertical)
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{
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len = index * (lineHeight + spacing.y) + alignmentOffset - ((lineHeight + spacing.y) * 2);
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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) + alignmentOffset;
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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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Debug.Log($"index:{index} len:{len} view:{viewLength} position:{position}");
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return position;
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}
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}
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}
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