mirror of
https://github.com/568071718/creator-collection-view
synced 2025-04-12 04:11:03 +00:00
115 lines
3.6 KiB
TypeScript
115 lines
3.6 KiB
TypeScript
import { YXBinaryLayout, YXCollectionView, YXIndexPath, YXLayoutAttributes } from "./yx-collection-view";
|
||
|
||
|
||
enum _yx_table_layout_alignment {
|
||
|
||
/**
|
||
* 单元节点相对列表居中
|
||
*/
|
||
CENTER,
|
||
|
||
/**
|
||
* 单元节点紧靠列表左侧
|
||
*/
|
||
LEFT,
|
||
|
||
/**
|
||
* 单元节点紧靠列表右侧
|
||
*/
|
||
RIGHT,
|
||
}
|
||
|
||
/**
|
||
* 想要了解自定义布局的,可以看看这个类,这个类实现了一个基础的 table view 的布局样式,相对来说比较简单
|
||
*
|
||
* - 支持不同的节点大小
|
||
* - 支持调整对齐方式
|
||
* - 不支持分区布局
|
||
* - 不支持水平方向滚动,仅支持垂直方向滚动
|
||
* - 不支持多列布局,仅支持单列布局
|
||
* - 支持调整上下边距/间距
|
||
*/
|
||
export class YXTableLayout extends YXBinaryLayout {
|
||
|
||
/**
|
||
* 单元格大小
|
||
*/
|
||
itemSize: cc.Size | ((indexPath: YXIndexPath, layout: YXTableLayout, collectionView: YXCollectionView) => cc.Size) = new cc.Size(100, 100)
|
||
|
||
/**
|
||
* 间距
|
||
*/
|
||
spacing: number = 0
|
||
|
||
/**
|
||
* 上边距
|
||
*/
|
||
top: number = 0
|
||
|
||
/**
|
||
* 下边距
|
||
*/
|
||
bottom: number = 0
|
||
|
||
/**
|
||
* 对齐方式
|
||
*/
|
||
alignment: _yx_table_layout_alignment = YXTableLayout.Alignment.CENTER
|
||
static Alignment = _yx_table_layout_alignment
|
||
|
||
prepare(collectionView: YXCollectionView): void {
|
||
// 设置列表的滚动方向
|
||
if (collectionView.scrollDirection == YXCollectionView.ScrollDirection.HORIZONTAL) {
|
||
cc.warn(`YXTableLayout 只支持垂直方向排列`)
|
||
}
|
||
collectionView.scrollView.horizontal = false
|
||
collectionView.scrollView.vertical = true
|
||
|
||
let contentSize = collectionView.node.getContentSize()
|
||
let attrs = []
|
||
|
||
let maxY = this.top
|
||
|
||
// 获取列表内一共需要展示多少数据
|
||
let numberOfItems = collectionView.getNumberOfItems(0)
|
||
for (let row = 0; row < numberOfItems; row++) {
|
||
|
||
// 生成对应的 indexPath,并通过 indexPath 获取节点大小
|
||
// 这里是不支持分区所以不考虑 section 的情况,section 默认就是 0,支持的分区的情况可以回头看 flow-layout 的实现
|
||
let indexPath = new YXIndexPath(0, row)
|
||
let itemSize = this.itemSize instanceof Function ? this.itemSize(indexPath, this, collectionView) : this.itemSize
|
||
|
||
// 生成布局属性对象,并按照 table view 的规则确定好节点的位置
|
||
let attributes = new YXLayoutAttributes(indexPath)
|
||
attributes.frame = new cc.Rect()
|
||
attributes.frame.size = itemSize
|
||
attributes.frame.y = maxY + (row > 0 ? this.spacing : 0)
|
||
attributes.frame.x = 0
|
||
if (this.alignment == _yx_table_layout_alignment.RIGHT) {
|
||
attributes.frame.x = (contentSize.width - attributes.frame.width)
|
||
}
|
||
if (this.alignment == _yx_table_layout_alignment.CENTER) {
|
||
attributes.frame.x = (contentSize.width - attributes.frame.width) * 0.5
|
||
}
|
||
attrs.push(attributes)
|
||
maxY = attributes.frame.yMax
|
||
}
|
||
|
||
maxY += this.bottom
|
||
|
||
// 保存起来给列表组件使用
|
||
this.attributes = attrs
|
||
|
||
// 确定滚动范围的总大小
|
||
contentSize.height = Math.max(contentSize.height, maxY)
|
||
this.contentSize = contentSize
|
||
}
|
||
|
||
initOffset(collectionView: YXCollectionView): void {
|
||
// 首次更新数据,滚动至列表顶部
|
||
collectionView.scrollView.scrollToTop()
|
||
}
|
||
}
|
||
|
||
|