ScrollViewHelper

最新推荐文章于 2021-05-29 01:42:05 发布

原创最新推荐文章于 2021-05-29 01:42:05 发布 · 250 阅读

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CC 4.0 BY-SA版权

本文介绍了一个用于Unity游戏开发中UI系统的辅助类ScrollViewHelper。该类可以帮助开发者根据指定的行列数动态调整UIScrollView的内容区域大小及约束条件，确保UIScrollView能够正确显示不同数量的子项。

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using UnityEngine.UI;

namespace SwordmenWorld
{
public class ScrollViewHelper
{
RectTransform rootTransform;
GridLayoutGroup group;
RectTransform backGround;

float itemWidth;
float itemHeight;

float spacingX;
float spacingY;

float paddingX;
float paddingY;

int rowNumber;
int cloumnNumber;

public ScrollViewHelper(GridLayoutGroup group, RectTransform rootTransform, RectTransform backGround = null)
{
this.group = group;
this.rootTransform = rootTransform;
this.backGround = backGround;

itemWidth = group.cellSize.x;
itemHeight = group.cellSize.y;

spacingX = group.spacing.x;
spacingY = group.spacing.y;

paddingX = group.padding.left;
paddingY = group.padding.top;
}

public Vector2 GetRectSize(int rowNumber, int cloumnNumber)
{
float bgWidth = cloumnNumber * (itemWidth + spacingX) + paddingX;
float bgHeight = rowNumber * (itemHeight + spacingY) + paddingY;
Vector2 size = new Vector2(bgWidth, bgHeight);
return size;
}

public void SetScrollParam(int rowNumber, int cloumnNumber)
{
SetConstraint(rowNumber, cloumnNumber);
RectSize(rowNumber, cloumnNumber);
}

public void RectSize(int rowNumber, int cloumnNumber)
{
rootTransform.sizeDelta = GetRectSize(rowNumber, cloumnNumber);
if (backGround != null)
{
Vector2 size = backGround.sizeDelta;
size.x = rootTransform.sizeDelta.x;
backGround.sizeDelta = size;
}
}

public void SetConstraint(int rowNumber, int cloumnNumber)
{
if (rowNumber < cloumnNumber)
{
group.constraint = GridLayoutGroup.Constraint.FixedRowCount;
group.constraintCount = rowNumber;
}
else
{
group.constraint = GridLayoutGroup.Constraint.FixedColumnCount;
group.constraintCount = cloumnNumber;
}
}
}
}