119 lines
2.7 KiB
Go
119 lines
2.7 KiB
Go
package navigation
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import (
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"git.d3nexus.de/Dadido3/D3vugu-components/components/input"
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"github.com/vugu/vugu"
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)
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type Pagination struct {
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AttrMap vugu.AttrMap
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buttons []paginationButtonInfo
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Bind PaginationBinder
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Paginate PaginateHandler // External handler that is called upon an event.
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}
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type paginationButtonInfo struct {
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Page int
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Class string
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}
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// Page returns the currently selected page as a 1-based index.
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// A result of 0 means there is no selected page.
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func (c *Pagination) Page() int {
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if c.Bind == nil {
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return 0
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}
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return c.Bind.PaginationPage()
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}
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// Pages returns the total page number that this pagination component shows.
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func (c *Pagination) Pages() int {
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if c.Bind == nil {
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return 0
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}
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return c.Bind.PaginationPages()
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}
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func (c *Pagination) handleClickPrev(event input.ClickEvent) {
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c.handleClickPage(event, c.Page()-1)
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}
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func (c *Pagination) handleClickNext(event input.ClickEvent) {
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c.handleClickPage(event, c.Page()+1)
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}
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func (c *Pagination) handleClickPage(event input.ClickEvent, page int) {
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pages := c.Pages()
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if page <= 0 || page > pages {
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return
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}
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if c.Bind != nil {
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c.Bind.SetPaginationPage(page)
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}
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if c.Paginate != nil {
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c.Paginate.PaginateHandle(PaginateEvent{
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DOMEvent: event,
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PaginationInfo: PaginationInfo{
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Page: page,
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Pages: pages,
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},
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})
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}
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}
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func (c *Pagination) Compute(ctx vugu.ComputeCtx) {
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page, pages := c.Page(), c.Pages()
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// Number of buttons around the current page.
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// Excluding first and last page.
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const AroundButtons = 2
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// Number of buttons that can change, so excluding first and last page.
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const DynamicButtons = AroundButtons + 1 + AroundButtons
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// Number of buttons with page numbers, so excluding "previous" and "next".
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const TotalButtons = 1 + DynamicButtons + 1
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// Prepare buttons.
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buttons := [TotalButtons]paginationButtonInfo{
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0: {Page: 1},
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TotalButtons - 1: {Page: pages},
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}
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startPage := 2
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if startPage < page-AroundButtons {
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startPage = page - AroundButtons
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}
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if startPage > pages-DynamicButtons {
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startPage = pages - DynamicButtons
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}
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for i := 0; i < DynamicButtons; i++ {
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buttons[i+1] = paginationButtonInfo{Page: i + startPage}
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}
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// Remove duplicates and set class accordingly.
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// pageCounter is used to check if pages are strictly monotonically increasing.
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buttonsFiltered := make([]paginationButtonInfo, 0, len(buttons))
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pageCounter := 0
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for _, pageInfo := range buttons {
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if pageCounter < pageInfo.Page && pageInfo.Page <= pages {
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pageCounter = pageInfo.Page
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if pageInfo.Page == page {
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pageInfo.Class = "d3c-button-highlight"
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}
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buttonsFiltered = append(buttonsFiltered, pageInfo)
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}
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}
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c.buttons = buttonsFiltered
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}
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