73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
package playletser
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import (
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"strconv"
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"strings"
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)
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const defaultThemeIndexPageSize = 20
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// ThemeIndexQuery 专题列表页分页参数。
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type ThemeIndexQuery struct {
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PageNum int
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PageSize int
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}
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func (q *ThemeIndexQuery) Normalize() {
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if q.PageNum <= 0 {
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q.PageNum = 1
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}
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if q.PageSize <= 0 {
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q.PageSize = defaultThemeIndexPageSize
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}
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}
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// ParseThemeIndexQuery 从语义化分页路由读取页码。
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func ParseThemeIndexQuery(page string) ThemeIndexQuery {
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q := ThemeIndexQuery{PageSize: defaultThemeIndexPageSize}
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if n, err := strconv.Atoi(strings.TrimSpace(page)); err == nil {
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q.PageNum = n
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}
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q.Normalize()
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return q
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}
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// BuildThemeIndexPage 过滤已启用专题，并按设计稿每页 20 项分页。
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func BuildThemeIndexPage(themes []PlayletThemeItem, q ThemeIndexQuery) ([]PlayletThemeItem, int64) {
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q.Normalize()
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visible := make([]PlayletThemeItem, 0, len(themes))
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for _, theme := range themes {
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if !theme.Status || theme.ID <= 0 || strings.TrimSpace(theme.Name) == "" {
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continue
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}
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visible = append(visible, theme)
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}
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total := int64(len(visible))
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start := (q.PageNum - 1) * q.PageSize
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if start >= len(visible) {
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return nil, total
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}
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end := start + q.PageSize
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if end > len(visible) {
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end = len(visible)
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}
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return visible[start:end], total
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}
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func themeIndexPageURL(page int) string {
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if page <= 1 {
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return "/topic"
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}
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return "/topic/page/" + strconv.Itoa(page)
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}
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func ThemeIndexCanonicalPath(q ThemeIndexQuery) string {
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q.Normalize()
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return themeIndexPageURL(q.PageNum)
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}
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func BuildThemeIndexPagination(q ThemeIndexQuery, totalCount int64) PaginationVM {
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q.Normalize()
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return BuildPagination(themeIndexPageURL, q.PageNum, q.PageSize, totalCount)
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}
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