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master @ 34 LINES
 
[ HISTORY ]  [ UP ]
 

// Numbered pager: 1 ... 4 5 [6] 7 8 ... 20. First and last pages always
// show; a sliding window surrounds the current page.
export interface Props {
  current: number;
  total: number;
  href: (n: number) => string;
}

export type PageItem =
  | { kind: "page"; n: number; current: boolean }
  | { kind: "gap" };

export function paginationItems(current: number, total: number, windowSize = 5): P
ageItem[] {
  const cur = Math.max(1, Math.min(total, current));
  if (total < 1) return [];

  const half = Math.floor(windowSize / 2);
  let start = Math.max(1, cur - half);
  const end = Math.min(total, start + windowSize - 1);
  start = Math.max(1, end - windowSize + 1);

  const items: PageItem[] = [];
  if (start > 1) {
    items.push({ kind: "page", n: 1, current: cur === 1 });
    if (start > 2) items.push({ kind: "gap" });
  }
  for (let n = start; n <= end; n++) items.push({ kind: "page", n, current: n === 
cur });
  if (end < total) {
    if (end < total - 1) items.push({ kind: "gap" });
    items.push({ kind: "page", n: total, current: cur === total });
  }
  return items;
}


// Numbered pager: 1 ... 4 5 [6] 7 8 ... 20.
 First and last pages always
// show; a sliding window surrounds the curr
ent page.
export interface Props {
  current: number;
  total: number;
  href: (n: number) => string;
}

export type PageItem =
  | { kind: "page"; n: number; current: bool
ean }
  | { kind: "gap" };

export function paginationItems(current: num
ber, total: number, windowSize = 5): PageIte
m[] {
  const cur = Math.max(1, Math.min(total, cu
rrent));
  if (total < 1) return [];

  const half = Math.floor(windowSize / 2);
  let start = Math.max(1, cur - half);
  const end = Math.min(total, start + window
Size - 1);
  start = Math.max(1, end - windowSize + 1);

  const items: PageItem[] = [];
  if (start > 1) {
    items.push({ kind: "page", n: 1, current
: cur === 1 });
    if (start > 2) items.push({ kind: "gap" 
});
  }
  for (let n = start; n <= end; n++) items.p
ush({ kind: "page", n, current: n === cur })
;
  if (end < total) {
    if (end < total - 1) items.push({ kind: 
"gap" });
    items.push({ kind: "page", n: total, cur
rent: cur === total });
  }
  return items;
}

 
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