History pagination (#58)

Adds pagination for the history page. fixes #32

src/components/landing/pages/history/history-card/history-card-list.tsx

@@ -1,10 +1,14 @@
-import React, {Fragment} from 'react'
+import React from 'react'
 import {HistoryEntriesProps} from "../history-content/history-content";
 import {HistoryCard} from "./history-card";
+import {Pager} from '../../../../pagination/pager';
+import {Row} from 'react-bootstrap';
+
+export const HistoryCardList: React.FC<HistoryEntriesProps> = ({entries, onPinClick, pageIndex, onLastPageIndexChange}) => {
 
-export const HistoryCardList: React.FC<HistoryEntriesProps> = ({entries, onPinClick}) => {
     return (
-        <Fragment>
+        <Row className="justify-content-center">
+            <Pager numberOfElementsPerPage={6} pageIndex={pageIndex} onLastPageIndexChange={onLastPageIndexChange}>
                 {
                     entries.map((entry) => (
                         <HistoryCard
@@ -13,6 +17,7 @@ export const HistoryCardList: React.FC<HistoryEntriesProps> = ({entries, onPinCl
                             onPinClick={onPinClick}
                         />))
                 }
-        </Fragment>
+            </Pager>
-    )
+        </Row>
+    );
 }

src/components/landing/pages/history/history-content/history-content.tsx

@@ -1,10 +1,11 @@
-import React from "react";
+import React, {Fragment, useState} from "react";
 import {HistoryEntry, pinClick} from "../history";
 import {HistoryTable} from "../history-table/history-table";
-import {Alert} from "react-bootstrap";
+import {Alert, Row} from "react-bootstrap";
 import {Trans} from "react-i18next";
 import {HistoryCardList} from "../history-card/history-card-list";
 import {ViewStateEnum} from "../history-toolbar/history-toolbar";
+import {PagerPagination} from "../../../../pagination/pager-pagination";
 
 export interface HistoryContentProps {
     viewState: ViewStateEnum
@@ -20,23 +21,43 @@ export interface HistoryEntryProps {
 export interface HistoryEntriesProps {
     entries: HistoryEntry[]
     onPinClick: pinClick
+    pageIndex: number
+    onLastPageIndexChange: (lastPageIndex: number) => void
 }
 
+
 export const HistoryContent: React.FC<HistoryContentProps> = ({viewState, entries, onPinClick}) => {
+    const [pageIndex, setPageIndex] = useState(0);
+    const [lastPageIndex, setLastPageIndex] = useState(0);
 
     if (entries.length === 0) {
         return (
+            <Row className={"justify-content-center"}>
                 <Alert variant={"secondary"}>
                     <Trans i18nKey={"noHistory"}/>
                 </Alert>
+            </Row>
         );
     }
 
+    const mapViewStateToComponent = (viewState: ViewStateEnum) => {
         switch (viewState) {
             default:
             case ViewStateEnum.card:
-            return <HistoryCardList entries={entries} onPinClick={onPinClick}/>
+                return <HistoryCardList entries={entries} onPinClick={onPinClick} pageIndex={pageIndex}
+                                        onLastPageIndexChange={setLastPageIndex}/>
             case ViewStateEnum.table:
-            return <HistoryTable entries={entries} onPinClick={onPinClick}/>;
+                return <HistoryTable entries={entries} onPinClick={onPinClick} pageIndex={pageIndex}
+                                     onLastPageIndexChange={setLastPageIndex}/>
         }
     }
+
+    return (
+        <Fragment>
+            {mapViewStateToComponent(viewState)}
+            <Row className="justify-content-center">
+                <PagerPagination numberOfPageButtonsToShowAfterAndBeforeCurrent={2} lastPageIndex={lastPageIndex}
+                                 onPageChange={setPageIndex}/>
+            </Row>
+        </Fragment>);
+}

src/components/landing/pages/history/history-table/history-table.tsx

@@ -3,8 +3,9 @@ import {Table} from "react-bootstrap"
 import {HistoryTableRow} from "./history-table-row";
 import {HistoryEntriesProps} from "../history-content/history-content";
 import {Trans} from "react-i18next";
+import {Pager} from "../../../../pagination/pager";
 
-const HistoryTable: React.FC<HistoryEntriesProps> = ({entries, onPinClick}) => {
+export const HistoryTable: React.FC<HistoryEntriesProps> = ({entries, onPinClick, pageIndex, onLastPageIndexChange}) => {
     return (
         <Table striped bordered hover size="sm" variant="dark">
             <thead>
@@ -16,6 +17,7 @@ const HistoryTable: React.FC<HistoryEntriesProps> = ({entries, onPinClick}) => {
             </tr>
             </thead>
             <tbody>
+            <Pager numberOfElementsPerPage={6} pageIndex={pageIndex} onLastPageIndexChange={onLastPageIndexChange}>
                 {
                     entries.map((entry) =>
                         <HistoryTableRow
@@ -24,9 +26,8 @@ const HistoryTable: React.FC<HistoryEntriesProps> = ({entries, onPinClick}) => {
                             onPinClick={onPinClick}
                         />)
                 }
+            </Pager>
             </tbody>
         </Table>
     )
 }
-
-export {HistoryTable}

src/components/landing/pages/history/history.tsx

@@ -57,11 +57,9 @@ export const History: React.FC = () => {
             <Row className={"justify-content-center mb-3"}>
                 <HistoryToolbar onSettingsChange={setViewState} tags={tags}/>
             </Row>
-            <div className="d-flex flex-wrap justify-content-center">
                 <HistoryContent viewState={viewState.viewState}
                                 entries={entriesToShow}
                                 onPinClick={pinClick}/>
-            </div>
         </Fragment>
     )
 }

src/components/pagination/pager-item.tsx

@@ -0,0 +1,17 @@
+import React from "react";
+
+export interface PageItemProps {
+    onClick: (index: number) => void
+    index: number
+}
+
+
+export const PagerItem: React.FC<PageItemProps> = ({index, onClick}) => {
+    return (
+        <li className="page-item">
+            <span className="page-link" role="button" onClick={() => onClick(index)}>
+                {index + 1}
+            </span>
+        </li>
+    );
+}

src/components/pagination/pager-pagination.tsx

@@ -0,0 +1,82 @@
+import React, {Fragment, useEffect, useState} from "react";
+import {Pagination} from "react-bootstrap";
+import {PagerItem} from "./pager-item";
+
+export interface PaginationProps {
+    numberOfPageButtonsToShowAfterAndBeforeCurrent: number
+    onPageChange: (pageIndex: number) => void
+    lastPageIndex: number
+}
+
+export const PagerPagination: React.FC<PaginationProps> = ({numberOfPageButtonsToShowAfterAndBeforeCurrent, onPageChange, lastPageIndex}) => {
+    if (numberOfPageButtonsToShowAfterAndBeforeCurrent % 2 !== 0) {
+        throw new Error("number of pages to show must be even!")
+    }
+
+    const [pageIndex, setPageIndex] = useState(0);
+    const correctedPageIndex = Math.min(pageIndex, lastPageIndex);
+    const wantedUpperPageIndex = correctedPageIndex + numberOfPageButtonsToShowAfterAndBeforeCurrent;
+    const wantedLowerPageIndex = correctedPageIndex - numberOfPageButtonsToShowAfterAndBeforeCurrent;
+
+    useEffect(() => {
+        onPageChange(pageIndex)
+    }, [onPageChange, pageIndex])
+
+    const correctedLowerPageIndex =
+        Math.min(
+            Math.max(
+                Math.min(
+                    wantedLowerPageIndex,
+                    wantedLowerPageIndex + lastPageIndex - wantedUpperPageIndex
+                ),
+                0
+            ),
+            lastPageIndex
+        );
+
+    const correctedUpperPageIndex =
+        Math.max(
+            Math.min(
+                Math.max(
+                    wantedUpperPageIndex,
+                    wantedUpperPageIndex - wantedLowerPageIndex
+                ),
+                lastPageIndex
+            ),
+            0
+        );
+
+    const paginationItemsBefore = Array.from(new Array(correctedPageIndex - correctedLowerPageIndex)).map((k, index) => {
+        const itemIndex = correctedLowerPageIndex + index;
+        return <PagerItem key={itemIndex} index={itemIndex} onClick={setPageIndex}/>
+    });
+
+    const paginationItemsAfter = Array.from(new Array(correctedUpperPageIndex - correctedPageIndex)).map((k, index) => {
+        const itemIndex = correctedPageIndex + index + 1;
+        return <PagerItem key={itemIndex} index={itemIndex} onClick={setPageIndex}/>
+    });
+
+    return (
+        <Pagination>
+            {
+                correctedLowerPageIndex > 0 ?
+                    <Fragment>
+                        <PagerItem key={0} index={0} onClick={setPageIndex}/>
+                        <Pagination.Ellipsis disabled/>
+                    </Fragment>
+                    : null
+            }
+            {paginationItemsBefore}
+            <Pagination.Item active>{correctedPageIndex + 1}</Pagination.Item>
+            {paginationItemsAfter}
+            {
+                correctedUpperPageIndex < lastPageIndex ?
+                    <Fragment>
+                        <Pagination.Ellipsis disabled/>
+                        <PagerItem key={lastPageIndex} index={lastPageIndex} onClick={setPageIndex}/>
+                    </Fragment>
+                    : null
+            }
+        </Pagination>
+    );
+}

src/components/pagination/pager.tsx

@@ -0,0 +1,24 @@
+import React, {Fragment, useEffect} from "react";
+
+export interface PagerPageProps {
+    pageIndex: number
+    numberOfElementsPerPage: number
+    onLastPageIndexChange: (lastPageIndex: number) => void
+}
+
+export const Pager: React.FC<PagerPageProps> = ({children, numberOfElementsPerPage, pageIndex, onLastPageIndexChange}) => {
+
+    useEffect(() => {
+        const lastPageIndex = Math.ceil(React.Children.count(children) / numberOfElementsPerPage) - 1;
+        onLastPageIndexChange(lastPageIndex)
+    }, [children, numberOfElementsPerPage, onLastPageIndexChange])
+
+    return <Fragment>
+        {
+            React.Children.toArray(children).filter((value, index) => {
+                const pageOfElement = Math.floor((index) / numberOfElementsPerPage);
+                return (pageOfElement === pageIndex);
+            })
+        }
+    </Fragment>
+}