88 lines
3.1 KiB
C#
88 lines
3.1 KiB
C#
using System;
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using System.Collections.Generic;
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using UnityEngine;
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namespace AlicizaX.UI.RecyclerView
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{
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public class PageLayoutManager : LinearLayoutManager
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{
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private float minScale;
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public PageLayoutManager(float minScale = 0.9f)
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{
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this.minScale = minScale;
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}
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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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position += viewportSize.y - lineHeight;
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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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position += viewportSize.x - lineHeight;
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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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return Vector2.zero;
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}
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public override Vector2 CalculateViewportOffset()
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{
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return Vector2.zero;
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}
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protected override float GetOffset()
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{
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float offset = direction == Direction.Vertical ? viewportSize.y - lineHeight : viewportSize.x - lineHeight;
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return offset / 2;
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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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float pos = IndexToPosition(recyclerView.CurrentIndex);
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// 根据是前划还是后划，来加减偏移量
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int index = position > pos ? Mathf.RoundToInt(position / len + 0.25f) : Mathf.RoundToInt(position / len - 0.25f);
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return index;
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}
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public override void DoItemAnimation()
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{
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List<ViewHolder> viewHolders = viewProvider.ViewHolders;
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for (int i = 0; i < viewHolders.Count; i++)
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{
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float viewPos = direction == Direction.Vertical ?
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-viewHolders[i].RectTransform.anchoredPosition.y :
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viewHolders[i].RectTransform.anchoredPosition.x;
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float scale = 1 - Mathf.Min(Mathf.Abs(viewPos) * 0.0006f, 1f);
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scale = Mathf.Max(scale, minScale);
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viewHolders[i].RectTransform.localScale = Vector3.one * scale;
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}
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}
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}
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}
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