From 7bde352ea74ea08715b4b96492e88ddab9928a03 Mon Sep 17 00:00:00 2001
From: Madeorsk <madeorsk@protonmail.com>
Date: Sun, 14 Jul 2024 10:56:04 +0200
Subject: [PATCH] Add pagination components.

---
 demo/DemoApp.tsx                           |  42 +++++-
 src/Components/Pagination/Paginate.tsx     | 137 ++++++++++++++++++++
 src/Components/Pagination/Pagination.tsx   | 141 +++++++++++++++++++++
 src/styles/_components.less                |   1 +
 src/styles/components/_pagination.less     |   1 +
 src/styles/components/pagination/_nav.less |  67 ++++++++++
 6 files changed, 384 insertions(+), 5 deletions(-)
 create mode 100644 src/Components/Pagination/Paginate.tsx
 create mode 100644 src/Components/Pagination/Pagination.tsx
 create mode 100644 src/styles/components/_pagination.less
 create mode 100644 src/styles/components/pagination/_nav.less

diff --git a/demo/DemoApp.tsx b/demo/DemoApp.tsx
index fac4bab..1f4b34e 100644
--- a/demo/DemoApp.tsx
+++ b/demo/DemoApp.tsx
@@ -24,6 +24,7 @@ import {Application} from "../src/Application/Application";
 import {Outlet} from "react-router-dom";
 import {ToggleSwitch} from "../src/Components/Forms/ToggleSwitch";
 import {Step, Steps} from "../src/Components/Steps/Steps";
+import {AsyncPaginate, AutoPaginate, Paginate} from "../src/Components/Pagination/Paginate";
 
 export function DemoApp()
 {
@@ -31,6 +32,8 @@ export function DemoApp()
 
 	const [selected, setSelected] = useState(null);
 
+	const [page, setPage] = useState(11);
+
 	return (
 		<Application>
 			<MainMenu>
@@ -63,9 +66,7 @@ export function DemoApp()
 			<h2>TODO</h2>
 
 			<ul>
-				<li>Pagination</li>
-				<li>Global states</li>
-				<li>Async</li>
+				<li>Errors</li>
 				<li>Subapps</li>
 				<li>Modals</li>
 			</ul>
@@ -283,7 +284,7 @@ export function DemoApp()
 			<h3>Simple loaders</h3>
 
 			<Card>
-				<SpinningLoader/>
+				<SpinningLoader inline={true} />
 
 				<ListLoader/>
 			</Card>
@@ -310,7 +311,7 @@ export function DemoApp()
 						<Basket /> Submenu
 					</SubmenuItemSubmenu>
 				</Submenu>
-			} floatingOptions={{ placement: "right-start" }}>
+			} floatingOptions={{placement: "right-start"}}>
 				<button>Submenu on a button</button>
 			</SubmenuFloat>
 
@@ -410,6 +411,37 @@ export function DemoApp()
 					</Card>
 				</Step>
 			</Steps>
+
+			<h2>Pagination</h2>
+
+			<h3>Normal pagination</h3>
+
+			<Paginate onChange={setPage} count={72} page={page}>
+				<Card>Page {page}</Card>
+			</Paginate>
+
+			<h3>Auto pagination</h3>
+
+			<AutoPaginate count={55}>
+				{(page) => (
+					<Card>Page {page}</Card>
+				)}
+			</AutoPaginate>
+
+			<h3>Async pagination</h3>
+
+			<AsyncPaginate count={async () => { return 72; }} getData={async () => (["a", Math.random(), "c"])}>
+				{(data) => (
+					<>
+						{
+							data.map((value, index) => (
+								<div key={index}>{value}</div>
+							))
+						}
+					</>
+				)}
+			</AsyncPaginate>
+
 		</Application>
 	);
 }
diff --git a/src/Components/Pagination/Paginate.tsx b/src/Components/Pagination/Paginate.tsx
new file mode 100644
index 0000000..6686cb1
--- /dev/null
+++ b/src/Components/Pagination/Paginate.tsx
@@ -0,0 +1,137 @@
+import React, {useCallback, useState} from "react";
+import {Pagination} from "./Pagination";
+import {SpinningLoader} from "../Loaders/SpinningLoader";
+import {Await, useAsync} from "../../Async";
+
+/**
+ * Paginated content component with custom page handling.
+ */
+export function Paginate({ page, onChange, count, children }: React.PropsWithChildren<{
+	/**
+	 * The current page.
+	 */
+	page: number;
+
+	/**
+	 * Called when a new page is selected.
+	 * @param newPage The newly selected page.
+	 */
+	onChange: (newPage: number) => void;
+
+	/**
+	 * Pages count.
+	 */
+	count: number;
+}>)
+{
+	return (
+		<>
+			{children}
+
+			<Pagination page={page} onChange={onChange} count={count} />
+		</>
+	);
+}
+
+/**
+ * Paginated content component.
+ */
+export function AutoPaginate({ count, children }: {
+	/**
+	 * Pages count.
+	 */
+	count: number;
+
+	/**
+	 * Show the given page.
+	 * @param page The page to show.
+	 */
+	children: (page: number) => React.ReactElement;
+})
+{
+	// The current page.
+	const [page, setPage] = useState<number>(1);
+
+	return (
+		<Paginate page={page} onChange={setPage} count={count}>
+			{children(page)}
+		</Paginate>
+	);
+}
+
+/**
+ * Asynchronous paginated content component.
+ */
+export function AsyncPaginate<T>({ count, getData, children }: {
+	/**
+	 * Get pages count.
+	 */
+	count: () => Promise<number>;
+
+	/**
+	 * Get data for the given page.
+	 * @param page The page for which to get data.
+	 */
+	getData: (page: number) => Promise<T>;
+
+	/**
+	 * Show the current page with its retrieved data.
+	 * @param data Data of the page to show.
+	 * @param page The page to show.
+	 */
+	children: (data: T, page: number) => React.ReactElement;
+})
+{
+	// Getting pages count.
+	const asyncCount = useAsync(count, []);
+
+	return (
+		<Await async={asyncCount} fallback={<SpinningLoader />}>
+			{
+				(count) => (
+					<AutoPaginate count={count}>
+						{(page) => <AsyncPage page={page} getData={getData} render={children} />}
+					</AutoPaginate>
+				)
+			}
+		</Await>
+	);
+}
+
+/**
+ * An async page to render.
+ */
+export function AsyncPage<T>({page, getData, render}: {
+	/**
+	 * The page number to show.
+	 */
+	page: number;
+
+	/**
+	 * Get data for the given page.
+	 * @param page The page for which to get data.
+	 */
+	getData: (page: number) => Promise<T>;
+
+	/**
+	 * Render the page with its retrieved data.
+	 * @param data Data of the page to show.
+	 * @param page The page to show.
+	 */
+	render: (data: T, page: number) => React.ReactElement;
+})
+{
+	// Store function to get page data.
+	const getPageData = useCallback(() => {
+		return getData(page);
+	}, [page]);
+
+	// Getting page data.
+	const asyncPageData = useAsync(getPageData, [getPageData]);
+
+	return (
+		<Await async={asyncPageData} fallback={<SpinningLoader />}>
+			{(pageData) => render(pageData, page)}
+		</Await>
+	);
+}
diff --git a/src/Components/Pagination/Pagination.tsx b/src/Components/Pagination/Pagination.tsx
new file mode 100644
index 0000000..271a08d
--- /dev/null
+++ b/src/Components/Pagination/Pagination.tsx
@@ -0,0 +1,141 @@
+import React, {useEffect, useState} from "react";
+import {CaretLeft, CaretRight} from "@phosphor-icons/react";
+import {Tooltip} from "../Floating/Tooltip";
+import {usePreviousValue} from "../../Utils";
+
+/**
+ * Pagination component.
+ */
+export function Pagination({ page, onChange, count }: {
+	/**
+	 * The current page.
+	 */
+	page: number;
+
+	/**
+	 * Called when a new page is selected.
+	 * @param newPage The newly selected page.
+	 */
+	onChange: (newPage: number) => void;
+
+	/**
+	 * Pages count.
+	 */
+	count: number;
+})
+{
+	// Memorize previous page.
+	const previousPage = usePreviousValue(page);
+
+	// The input text to use, when the currently entered value is not a number.
+	const [inputText, setInputText] = useState(undefined);
+
+	useEffect(() => {
+		if (page != previousPage)
+			// If the page has changed, resetting the input text.
+			setInputText(undefined);
+	}, [previousPage, page]);
+
+	return (
+		<nav className={"pages"}>
+			<Tooltip content={"Previous"}>
+				<button className={"flat icon-only"} disabled={page <= 1} onClick={() => onChange(page - 1)}>
+					<CaretLeft/>
+				</button>
+			</Tooltip>
+
+			<ul>
+				{ // First page, only show when the current page isn't the first page.
+					page > 1 &&
+					<li>
+						<button className={"flat"} onClick={() => onChange(1)}>1</button>
+					</li>
+				}
+
+				{ // Space between first page and shown pages.
+					// Only show when the page isn't the first page.
+					page - 4 > 1 &&
+					<li>
+						<button className={"flat"} onClick={page - 4 > 2 ? undefined : () => onChange(page - 4)}>{page - 4 > 2 ? "···" : page - 4}</button>
+					</li>
+				}
+
+				{ // Only show when the page isn't the first page.
+					page - 3 > 1 &&
+					<li>
+						<button className={"flat"} onClick={() => onChange(page - 3)}>{page - 3}</button>
+					</li>
+				}
+				{ // Only show when the page isn't the first page.
+					page - 2 > 1 &&
+					<li>
+						<button className={"flat"} onClick={() => onChange(page - 2)}>{page - 2}</button>
+					</li>
+				}
+				{ // Only show when the page isn't the first page.
+					page - 1 > 1 &&
+					<li>
+						<button className={"flat"} onClick={() => onChange(page - 1)}>{page - 1}</button>
+					</li>
+				}
+
+				{ // Current page input.
+					<li className={"current"}>
+						<input type={"number"} step={1} min={1} max={count} value={inputText ?? page} onChange={(event) => {
+							// Try to get the new value, between 1 and page count.
+							const newValue = Math.max(Math.min(event.currentTarget.valueAsNumber, count), 1);
+							if (isNaN(newValue))
+								// Not a numeric value, keep the current input text without changing the page number.
+								setInputText(event.currentTarget.value);
+							else
+							{ // The value has been read successfully, changing it and resetting input text.
+								onChange(newValue);
+								setInputText(undefined);
+							}
+						}} />
+					</li>
+				}
+
+				{ // Only show when the page isn't the last page.
+					page + 1 < count &&
+					<li>
+						<button className={"flat"} onClick={() => onChange(page + 1)}>{page + 1}</button>
+					</li>
+				}
+				{ // Only show when the page isn't the last page.
+					page + 2 < count &&
+					<li>
+						<button className={"flat"} onClick={() => onChange(page + 2)}>{page + 2}</button>
+					</li>
+				}
+				{ // Only show when the page isn't the last page.
+					page + 3 < count &&
+					<li>
+						<button className={"flat"} onClick={() => onChange(page + 3)}>{page + 3}</button>
+					</li>
+				}
+
+				{ // Space between shown pages and last page.
+					// Only show when the page isn't the last page.
+					page + 4 < count &&
+					<li>
+						<button className={"flat"} onClick={page + 4 < (count - 1) ? undefined : () => onChange(page + 4)}>{page + 4 < (count - 1) ? "···" : page + 4}</button>
+					</li>
+				}
+
+				{ // Last page, only show when the current page isn't the last page.
+					page < count &&
+					<li>
+						<button className={"flat"} onClick={() => onChange(count)}>{count}</button>
+					</li>
+				}
+			</ul>
+
+			<Tooltip content={"Next"}>
+				<button className={"flat icon-only"} disabled={page >= count} onClick={() => onChange(page + 1)}>
+					<CaretRight/>
+				</button>
+			</Tooltip>
+		</nav>
+	);
+}
diff --git a/src/styles/_components.less b/src/styles/_components.less
index 2713841..645159c 100644
--- a/src/styles/_components.less
+++ b/src/styles/_components.less
@@ -9,6 +9,7 @@
 @import "components/_list";
 @import "components/_loaders";
 @import "components/_menus";
+@import "components/_pagination";
 @import "components/_select";
 @import "components/_steps";
 @import "components/_steps-counter";
diff --git a/src/styles/components/_pagination.less b/src/styles/components/_pagination.less
new file mode 100644
index 0000000..bb700da
--- /dev/null
+++ b/src/styles/components/_pagination.less
@@ -0,0 +1 @@
+@import "pagination/_nav";
diff --git a/src/styles/components/pagination/_nav.less b/src/styles/components/pagination/_nav.less
new file mode 100644
index 0000000..c90a2be
--- /dev/null
+++ b/src/styles/components/pagination/_nav.less
@@ -0,0 +1,67 @@
+nav.pages
+{
+	display: flex;
+	flex-direction: row;
+	align-items: center;
+	justify-content: center;
+
+	margin: auto;
+	padding: 0.25em;
+	width: 50em;
+	max-width: 95%;
+	box-sizing: border-box;
+	border-radius: 0.25em;
+
+	border: solid var(--background-darkest) thin;
+	background: var(--background-lighter);
+
+	button, .button
+	{
+		margin: auto;
+		border: none;
+
+		&:hover
+		{
+			background: var(--background-darker);
+		}
+	}
+
+	input
+	{
+		transition: background 0.2s ease;
+		width: 5em;
+		border-color: var(--background-darker);
+		outline: none;
+
+		text-align: center;
+
+		&:focus
+		{
+			background: var(--background-darker);
+		}
+	}
+
+	> ul
+	{
+		flex: 1;
+
+		margin: 0;
+		padding: 0;
+		list-style: none;
+
+		text-align: center;
+		vertical-align: middle;
+
+		> li
+		{
+			display: inline-block;
+			padding: 0;
+			vertical-align: middle;
+
+			button, .button
+			{
+				margin: auto 0.25em;
+			}
+		}
+	}
+}