Noah
500456c05e
* Add a "Newest" tab to the Forums landing page to order ALL forum posts (comments) by most recent, paginated. * Add a "Views" cooldown in Redis: viewing the same post multiple times within 1 hour doesn't ++ the view count with every page load, per user per thread ID. * Update the paginators to handle unlimited numbers of pages: shows max 7 page buttons with your current page towards the middle. * General ability to jump to the "last page" of anything: use a negative page size like ?page=-1 and it acts like the last page.
120 lines
2.2 KiB
Go
120 lines
2.2 KiB
Go
package models
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import (
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"math"
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"net/http"
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"strconv"
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"code.nonshy.com/nonshy/website/pkg/config"
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)
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// Pagination result object.
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type Pagination struct {
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Page int // provide <0 to mean "last page"
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PerPage int
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Total int64
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Sort string
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// privates
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lastPage bool
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}
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// Page for Iter.
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type Page struct {
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Page int
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IsCurrent bool
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}
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// Load the page from form or query parameters.
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func (p *Pagination) ParsePage(r *http.Request) {
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raw := r.FormValue("page")
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a, err := strconv.Atoi(raw)
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if err == nil {
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if a <= 0 {
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p.lastPage = true
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a = 1
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}
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p.Page = a
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} else {
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p.Page = 1
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}
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}
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// Iter the pages, for templates.
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func (p *Pagination) Iter() []Page {
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var (
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pages = []Page{}
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pageIdx int
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total = p.Pages()
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)
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for i := 1; i <= total; i++ {
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pages = append(pages, Page{
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Page: i,
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IsCurrent: i == p.Page,
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})
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if i == p.Page {
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pageIdx = i
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}
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}
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// Do we have A LOT of pages?
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if len(pages) > config.PagerButtonLimit {
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// We return a slide only N pages long. Where is our current page in the offset?
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if pageIdx <= config.PagerButtonLimit/2 {
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// We are near the front, return the first N pages.
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return pages[:config.PagerButtonLimit+1]
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}
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// Are we near the end?
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if pageIdx > len(pages)-(config.PagerButtonLimit/2) {
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// We are near the end, return the last N pages.
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return pages[len(pages)-config.PagerButtonLimit-1:]
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}
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// We are somewhere in the middle.
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var result = []Page{}
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for i := pageIdx - (config.PagerButtonLimit / 2) - 1; i < pageIdx+(config.PagerButtonLimit/2); i++ {
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if i >= 0 && i < len(pages) {
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result = append(result, pages[i])
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}
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}
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return result
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}
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return pages
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}
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func (p *Pagination) Pages() int {
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return int(math.Ceil(float64(p.Total) / float64(p.PerPage)))
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}
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func (p *Pagination) GetOffset() int {
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// Are we looking for the FINAL page?
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if p.lastPage && p.Pages() >= 1 {
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p.Page = p.Pages()
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}
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return (p.Page - 1) * p.PerPage
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}
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func (p *Pagination) HasNext() bool {
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return p.Page < p.Pages()
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}
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func (p *Pagination) HasPrevious() bool {
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return p.Page > 1
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}
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func (p *Pagination) Next() int {
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if p.Page >= p.Pages() {
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return p.Pages()
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}
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return p.Page + 1
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}
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func (p *Pagination) Previous() int {
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if p.Page > 1 {
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return p.Page - 1
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}
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return 1
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}
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