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import { addMeltEventListener, makeElement, createElHelpers, executeCallbacks, isHTMLElement, kbd, omit, overridable, toWritableStores, } from '../../internal/helpers/index.js';
import { derived, readonly, writable } from 'svelte/store';
import { getPageItems } from './helpers.js';
import { withGet } from '../../internal/helpers/withGet.js';
const defaults = {
perPage: 1,
siblingCount: 1,
defaultPage: 1,
};
const { name, selector } = createElHelpers('pagination');
export function createPagination(props) {
const withDefaults = { ...defaults, ...props };
const pageWritable = withDefaults.page ?? writable(withDefaults.defaultPage);
const page = overridable(pageWritable, withDefaults?.onPageChange);
// options
const options = toWritableStores(omit(withDefaults, 'page', 'onPageChange', 'defaultPage'));
const { perPage, siblingCount, count } = options;
const totalPages = withGet.derived([count, perPage], ([$count, $perPage]) => {
return Math.ceil($count / $perPage);
});
const range = derived([page, perPage, count], ([$page, $perPage, $count]) => {
const start = ($page - 1) * $perPage;
const end = Math.min(start + $perPage, $count);
return { start, end };
});
const root = makeElement(name(), {
returned: () => ({
'data-scope': 'pagination',
}),
});
const pages = derived([page, totalPages, siblingCount], ([$page, $totalPages, $siblingCount]) => {
return getPageItems({ page: $page, totalPages: $totalPages, siblingCount: $siblingCount });
});
const keydown = (e) => {
const thisEl = e.target;
if (!isHTMLElement(thisEl))
return;
const rootEl = thisEl.closest('[data-scope="pagination"]');
if (!isHTMLElement(rootEl))
return;
const triggers = Array.from(rootEl.querySelectorAll(selector('page'))).filter((el) => isHTMLElement(el));
const prevButton = rootEl.querySelector(selector('prev'));
const nextButton = rootEl.querySelector(selector('next'));
if (isHTMLElement(prevButton)) {
triggers.unshift(prevButton);
}
if (isHTMLElement(nextButton)) {
triggers.push(nextButton);
}
const index = triggers.indexOf(thisEl);
if (e.key === kbd.ARROW_LEFT && index !== 0) {
e.preventDefault();
triggers[index - 1].focus();
}
else if (e.key === kbd.ARROW_RIGHT && index !== triggers.length - 1) {
e.preventDefault();
triggers[index + 1].focus();
}
else if (e.key === kbd.HOME) {
e.preventDefault();
triggers[0].focus();
}
else if (e.key === kbd.END) {
e.preventDefault();
triggers[triggers.length - 1].focus();
}
};
const pageTrigger = makeElement(name('page'), {
stores: page,
returned: ($page) => {
return (pageItem) => {
return {
'aria-label': `Page ${pageItem.value}`,
'data-value': pageItem.value,
'data-selected': pageItem.value === $page ? '' : undefined,
};
};
},
action: (node) => {
const unsub = executeCallbacks(addMeltEventListener(node, 'click', () => {
const value = node.dataset.value;
if (!value || Number.isNaN(+value))
return;
page.set(Number(value));
}), addMeltEventListener(node, 'keydown', keydown));
return {
destroy: unsub,
};
},
});
const prevButton = makeElement(name('prev'), {
stores: page,
returned: ($page) => {
return {
'aria-label': 'Previous',
disabled: $page <= 1,
};
},
action: (node) => {
const unsub = executeCallbacks(addMeltEventListener(node, 'click', () => {
page.update((p) => Math.max(p - 1, 1));
}), addMeltEventListener(node, 'keydown', keydown));
return {
destroy: unsub,
};
},
});
const nextButton = makeElement(name('next'), {
stores: [page, totalPages],
returned: ([$page, $totalPages]) => {
return {
'aria-label': 'Next',
disabled: $page >= $totalPages,
};
},
action: (node) => {
const unsub = executeCallbacks(addMeltEventListener(node, 'click', () => {
const $totalPages = totalPages.get();
page.update((p) => Math.min(p + 1, $totalPages));
}), addMeltEventListener(node, 'keydown', keydown));
return {
destroy: unsub,
};
},
});
return {
elements: {
root,
pageTrigger,
prevButton,
nextButton,
},
states: {
range: readonly(range),
page: page,
pages: readonly(pages),
totalPages: readonly(totalPages),
},
options,
};
}
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