pcm-kubernetes/app/page.go

package app

type Page[T any] struct {
	// 当前页码
	PageNum int64 `json:"pageNum"`
	//每页显示条数
	PageSize int64 `json:"pageSize"`
	// 总数量
	Total int64 `json:"total"`
	// 总页数
	TotalPage int64 `json:"totalPage"`
	// 数据列表
	List []T `json:"list"`
}

// Paginator 生成新的分页数据对象
func Paginator[T any](items *Page[T], total, pageNum, pageSize int64) *Page[T] {
	var (
		pageStart int64
		pageEnd   int64
	)

	if pageNum <= 0 {
		pageNum = 1
	}
	if pageSize <= 0 {
		pageSize = 10
	}

	//总页数
	totalPages := total / pageSize
	if (total % pageSize) > 0 {
		totalPages += 1
	}

	if pageNum*pageSize < total {
		pageEnd = pageNum * pageSize
		pageStart = pageEnd - pageSize
	} else {
		pageEnd = total
		pageStart = pageSize * (totalPages - 1)
	}

	if pageEnd > total {
		pageEnd = total
	}
	if total <= 0 {
		items.List = make([]T, 0)

	} else {
		items.List = items.List[pageStart:pageEnd]
	}

	return &Page[T]{
		PageNum:   pageNum,
		PageSize:  pageSize,
		TotalPage: totalPages,
		Total:     total,
		List:      items.List,
	}
}