91 lines
2.1 KiB
Go
91 lines
2.1 KiB
Go
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package navigation
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import "github.com/vugu/vugu"
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type Pagination struct {
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AttrMap vugu.AttrMap
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buttons []paginationButtonInfo
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Page int `vugu:"data"`
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Pages int `vugu:"data"`
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Pagination PaginationHandler // 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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func (c *Pagination) handleClickPrev(event vugu.DOMEvent) {
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c.handleClickPage(event, c.Page-1)
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}
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func (c *Pagination) handleClickNext(event vugu.DOMEvent) {
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c.handleClickPage(event, c.Page+1)
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}
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func (c *Pagination) handleClickPage(event vugu.DOMEvent, page int) {
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if page <= 0 || page > c.Pages {
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return
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}
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if c.Pagination != nil {
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c.Pagination.PaginationHandle(PaginationEvent{
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DOMEvent: event,
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Page: page,
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})
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}
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}
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func (c *Pagination) Init(ctx vugu.InitCtx) {
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c.Pages = 10
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}
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func (c *Pagination) Compute(ctx vugu.ComputeCtx) {
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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: c.Pages},
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}
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startPage := 2
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if startPage < c.Page-AroundButtons {
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startPage = c.Page - AroundButtons
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}
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if startPage > c.Pages-DynamicButtons {
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startPage = c.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 _, page := range buttons {
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if pageCounter < page.Page && page.Page <= c.Pages {
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pageCounter = page.Page
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if page.Page == c.Page {
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page.Class = "d3c-1684167638-selected"
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}
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buttonsFiltered = append(buttonsFiltered, page)
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}
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}
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c.buttons = buttonsFiltered
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}
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