From 8967cf7647442edb7215f008cdee5f6558842842 Mon Sep 17 00:00:00 2001
From: Kendall Garner <17521368+kgarner7@users.noreply.github.com>
Date: Tue, 26 Jul 2022 15:52:13 +0000
Subject: [PATCH] Paginate/infinite scroll for  albums, playlists (#1234)

* Infinite scroll, pagination to album, playlists

* move pagination below tracks

* Make page size configurable

* remove renderer
---
 src/i18n/en_US.json                           |   2 +
 src/main/base/browserwindow.ts                |   1 +
 src/main/base/store.ts                        |   7 +-
 src/renderer/views/components/pagination.ejs  | 175 ++++++++++++++++++
 .../views/components/settings-window.ejs      |  21 +++
 src/renderer/views/pages/cider-playlist.ejs   |  78 +++++++-
 src/renderer/views/pages/library-albums.ejs   |  37 +++-
 src/renderer/views/pages/library-songs.ejs    | 158 ++--------------
 8 files changed, 328 insertions(+), 151 deletions(-)
 create mode 100644 src/renderer/views/components/pagination.ejs

diff --git a/src/i18n/en_US.json b/src/i18n/en_US.json
index b01419a5..d8b8d5a8 100644
--- a/src/i18n/en_US.json
+++ b/src/i18n/en_US.json
@@ -360,6 +360,8 @@
   "settings.prompt.general.keybindings.update.success": "Keybind updated successfully. Press OK to relaunch Cider",
   "settings.option.general.themeUpdateNotification": "Automatically check for theme updates",
   "settings.option.general.showLovedTracksInline": "Show loved tracks inline",
+  "settings.option.general.pagination": "Items to show per page",
+  "settings.options.general.pagination.description": "This determines how many songs/albums to show initially for infinite scrolling, or how many songs/albums to show for a single page",
   "settings.description.search": "Search",
   "settings.description.albums": "Library Albums",
   "settings.description.artists": "Library Artists",
diff --git a/src/main/base/browserwindow.ts b/src/main/base/browserwindow.ts
index 20addc89..a63dec93 100644
--- a/src/main/base/browserwindow.ts
+++ b/src/main/base/browserwindow.ts
@@ -125,6 +125,7 @@ export class BrowserWindow {
                 "components/hello-world",
                 "components/inline-collection-list",
                 "components/settings-window",
+                "components/pagination",
                 "components/settings-keybinds",
                 "components/settings-themes",
                 "components/settings-themes-github",
diff --git a/src/main/base/store.ts b/src/main/base/store.ts
index 2debe3ca..abce4f17 100644
--- a/src/main/base/store.ts
+++ b/src/main/base/store.ts
@@ -153,11 +153,16 @@ export class Store {
                 "size": "normal"
             },
             "albums": {
+                "scroll": "infinite",
                 "sort": "name",
                 "sortOrder": "asc",
                 "viewAs": "covers"
             },
-            "localPaths": []
+            "playlists": {
+                "scroll": "infinite"
+            },
+            "localPaths": [],
+            "pageSize": 250
         },
         "audio": {
             "volume": 1,
diff --git a/src/renderer/views/components/pagination.ejs b/src/renderer/views/components/pagination.ejs
new file mode 100644
index 00000000..82fc0206
--- /dev/null
+++ b/src/renderer/views/components/pagination.ejs
@@ -0,0 +1,175 @@
+<script type="text/x-template" id="pagination">
+    <div class="row" style="margin-bottom: 16px" v-if="!isInfinite">
+        <button
+            class="col md-btn page-btn"
+            :disabled="effectivePage === 1"
+            @click="goToPage(1)"
+        >
+            <img class="md-ico-first"/>
+        </button>
+        <button
+            class="col md-btn page-btn prev"
+            :disabled="effectivePage === 1"
+            @click="goToPrevious()"
+        >
+            <img class="md-ico-prev"/>
+        </button>
+        <button
+            :class="`col md-btn page-btn${ isCurrentPage(page) ? ' md-btn-primary': ''}`"
+            @click="goToPage(page)"
+            v-for="page in pagesToShow"
+        >{{ page }}</button>
+        <button
+            class="col md-btn page-btn next"
+            :disabled="effectivePage === numPages"
+            @click="goToNext()"
+        >
+            <img class="md-ico-next"/>
+        </button>
+        <button
+            class="col md-btn page-btn last"
+            :disabled="effectivePage === numPages"
+            @click="goToEnd()"
+        >
+            <img class="md-ico-last"/>
+        </button>
+        <div class="col page-btn" style="min-width: 12em;">
+            <input type="number" min="1" :max="numPages" :value="effectivePage" @change="changePage" />
+            <span>/ {{ numPages }}</span>
+        </div>
+    </div>
+</script>
+
+<script>
+    Vue.component('pagination', {
+        template: "#pagination",
+        props: {
+            'length': { type: Number, required: true },
+            'pageSize': { type: Number, required: true },
+            'scroll': { type: String, required: true },
+            'scrollSelector': { type: String, required: true }
+        },
+        data: function () {
+            return { currentPage: 1 }
+        },
+        mounted() {
+            document.querySelector(this.scrollSelector)
+                .addEventListener("scroll", this.handleScroll)
+        },
+        destroyed() {
+            document.querySelector(this.scrollSelector)
+                .removeEventListener("scroll", this.handleScroll)
+        },
+        watch: {
+            'length': function () {
+                if (this.isInfinite) {
+                    // If a search reduces the number of things to show, we want to limit
+                    // the number of songs shown as well. This is to prevent you scrolling
+                    // to load your entire library, searching for one song, and then having
+                    // th re-render the entire library
+                    if (this.currentPage > this.numPages) {
+                        this.currentPage = this.numPages;
+                        this.$emit("onRangeChange", this.currentRange);
+                    }
+                } else {
+                    this.$emit("onRangeChange", this.currentRange);
+                }
+            },
+            'scroll': function () {
+                // When changing modes, set the page to 1. This is primarily to
+                // prevent going to a high page (e.g., 50) and then switching to infinite
+                // and showing 12.5k songs
+                this.currentPage = 1;
+                this.$emit("onRangeChange", this.currentRange);
+            }
+        },
+        computed: {
+            isInfinite: function () {
+                return this.scroll === "infinite"
+            },
+            currentRange: function () {
+                if (this.isInfinite) {
+                    return [0, this.currentPage * this.pageSize];
+                } else {
+                    const startingPage = Math.min(this.numPages, this.currentPage);
+
+                    return [
+                        (startingPage - 1) * this.pageSize,
+                        startingPage * this.pageSize
+                    ];
+                }
+            },
+            effectivePage: function () {
+                return Math.min(this.currentPage, this.numPages)
+            },
+            numPages: function () {
+                return Math.ceil(this.length / this.pageSize) || 1;
+            },
+            pagesToShow: function () {
+                let start = this.currentPage - 2;
+                let end = this.currentPage + 2;
+
+                if (start < 1) {
+                    end += (1 - start);
+                    start = 1;
+                }
+
+                const endDifference = end - this.numPages;
+                if (endDifference > 0) {
+                    end = this.numPages;
+                    start = Math.max(1, start - endDifference);
+                }
+
+                const array = [];
+                for (let idx = start; idx <= end; idx++) {
+                    array.push(idx);
+                }
+                return array;
+            }
+        },
+        methods: {
+            // Infinite Scrolling
+            handleScroll: function (event) {
+                if (this.isInfinite &&
+                    this.currentPage < this.numPages &&
+                    event.target.scrollTop >= event.target.scrollHeight - event.target.clientHeight) {
+                    this.currentPage += 1;
+                    this.$emit("onRangeChange", this.currentRange);
+                }
+            },
+            // Pagination
+            isCurrentPage: function (idx) {
+                return idx === this.currentPage ||
+                    (idx === this.numPages && this.currentPage > this.numPages);
+            },
+            changePage: function (event) {
+                const value = event.target.valueAsNumber;
+
+                if (!isNaN(value) && value >= 1 && value <= this.numPages) {
+                    this.currentPage = value;
+                    this.$emit("onRangeChange", this.currentRange);
+                }
+            },
+            goToPage: function (page) {
+                this.currentPage = page;
+                this.$emit("onRangeChange", this.currentRange);
+            },
+            goToPrevious: function () {
+                if (this.currentPage > 1) {
+                    this.currentPage -= 1;
+                    this.$emit("onRangeChange", this.currentRange);
+                }
+            },
+            goToNext: function () {
+                if (this.currentPage < this.numPages) {
+                    this.currentPage += 1;
+                    this.$emit("onRangeChange", this.currentRange);
+                }
+            },
+            goToEnd: function () {
+                this.currentPage = this.numPages;
+                this.$emit("onRangeChange", this.currentRange);
+            }
+        }
+    })
+</script>
\ No newline at end of file
diff --git a/src/renderer/views/components/settings-window.ejs b/src/renderer/views/components/settings-window.ejs
index 42415be2..246f7535 100644
--- a/src/renderer/views/components/settings-window.ejs
+++ b/src/renderer/views/components/settings-window.ejs
@@ -1262,6 +1262,27 @@
                                         </label>
                                     </div>
                                 </div>
+
+                                <div class="md-option-line">
+                                    <div class="md-option-segment">
+                                        {{$root.getLz('settings.option.general.pagination')}}<br>
+                                        <small>
+                                            {{$root.getLz('settings.options.general.pagination.description')}}<br>
+                                        </small>
+                                    </div>
+                                    <div class="md-option-segment md-option-segment_auto">
+                                        <label>
+                                            <select class="md-select" style="width:180px;"
+                                                    v-model.number="$root.cfg.libraryPrefs.pageSize" type="number">
+                                                <option value="50">50</option>
+                                                <option value="100">100</option>
+                                                <option value="250">250</option>
+                                                <option value="500">500</option>
+                                                <option value="1000">1000</option>
+                                            </select>
+                                        </label>
+                                    </div>
+                                </div>
                             </div>
                         </div>
                     </div>
diff --git a/src/renderer/views/pages/cider-playlist.ejs b/src/renderer/views/pages/cider-playlist.ejs
index 4da96a35..6db45794 100644
--- a/src/renderer/views/pages/cider-playlist.ejs
+++ b/src/renderer/views/pages/cider-playlist.ejs
@@ -107,6 +107,12 @@
                                     <img :class="(!inLibrary) ? 'md-ico-add' : 'md-ico-remove'">
                                     {{app.getLz('term.confirm')}}
                                 </button>
+                                <select v-if="shouldPaginate" class="md-select" v-model="prefs.scroll">
+                                    <optgroup :label="app.getLz('term.scroll')">
+                                        <option value="infinite">{{app.getLz('term.scroll.infinite')}}</option>
+                                        <option value="paged">{{app.getLz('term.scroll.paged').replace("${songsPerPage}", pageSize)}}</option>
+                                    </optgroup>
+                                </select>
                                 <div style="display: flex; float: right;">
                                     <button :style="{ 'background': '#' + hasHeroObject()?.textColor4 ?? '' }" :class="['search-btn', showSearch ? 'active' : '']" @click="toggleSearch()" :aria-label="showSearch ? app.getLz('term.hideSearch') : app.getLz('term.showSearch')">
                                         <svg-icon :style="{ 'width': '15px', 'background-color': '#' + hasHeroObject()?.bgColor ?? '' }" :url="showSearch ? './assets/search-alt.svg' : './assets/search.svg'">
@@ -161,6 +167,12 @@
                                 <img :class="(!inLibrary) ? 'md-ico-add' : 'md-ico-remove'">
                                 {{app.getLz('term.confirm')}}
                             </button>
+                            <select v-if="shouldPaginate" class="md-select" v-model="prefs.scroll">
+                                <optgroup :label="app.getLz('term.scroll')">
+                                    <option value="infinite">{{app.getLz('term.scroll.infinite')}}</option>
+                                    <option value="paged">{{app.getLz('term.scroll.paged').replace("${songsPerPage}", pageSize)}}</option>
+                                </optgroup>
+                            </select>
                         </div>
                     </div>
                     <div class="col-auto cider-flex-center">
@@ -172,7 +184,7 @@
             </div>
             <div class="playlist-body scrollbody">
                 <b-tabs pills class="track-pills pilldim fancy-pills" align="center" content-class="mt-3" :nav-wrapper-class="navClass(data)">
-                    <b-tab :title="$root.getLz('term.tracks')">
+                    <b-tab :title="$root.getLz('term.tracks')" id="songList">
                         <div @wheel="minClass(true)" @scroll="minClass(true)">
                         <div class="">
                             <div style="width:100%" @click="minClass(true)">
@@ -186,18 +198,27 @@
                                         class="search-input"
                                         ref="search-bar">
                                 </div>
+                                <pagination
+                                    v-if="shouldPaginate"
+                                    style="margin-top: 10px"
+                                    :length="hasNestedPlaylist ? nestedDisplayLength: displayListing.length"
+                                    :pageSize="pageSize"
+                                    :scroll="prefs.scroll"
+                                    scrollSelector="#songList"
+                                    @onRangeChange="onRangeChange"
+                                />
                                 <draggable :options="{disabled: !editing}"
                                            v-model="data.relationships.tracks.data" @start="drag=true"
                                            @end="drag=false;put()">
                                     <template v-if="!hasNestedPlaylist">
-                                        <mediaitem-list-item :item="item" :parent="getItemParent(data)" :index="index"
+                                        <mediaitem-list-item :item="item" :parent="getItemParent(data)" :index="index + start"
                                                              :showIndex="true"
                                                              :showIndexPlaylist="(data.attributes.playParams?.kind ?? data.type ?? '').includes('playlist')"
                                                              :context-ext="buildContextMenu()"
-                                                             v-for="(item,index) in displayListing"></mediaitem-list-item>
+                                                             v-for="(item,index) in currentSlice"></mediaitem-list-item>
                                     </template>
                                     <template v-else>
-                                        <div v-for="disc in nestedPlaylist">
+                                        <div v-for="disc in nestedSlices">
                                             <div class="playlist-time">{{($root.getLz("term.discNumber") ??
                                                 "").replace("${discNumber}",disc.disc)}}
                                             </div>
@@ -278,6 +299,7 @@
         props: ["data"],
 
         data: function () {
+            const pageSize = this.$root.cfg.libraryPrefs.pageSize;
             return {
                 editorialNotesExpanded: false,
                 drag: false,
@@ -291,6 +313,7 @@
                 headerVisible: true,
                 useArtistChip: false,
                 nestedPlaylist: [],
+                nestedDisplayLength: 0,
                 classes: [],
                 editing: false,
                 inPlaylist: false,
@@ -298,6 +321,10 @@
                 displayListing: [],
                 hasNestedPlaylist: false,
                 showSearch: false,
+                pageSize: pageSize,
+                start: 0,
+                end: pageSize,
+                prefs: this.$root.cfg.libraryPrefs.playlists
             }
         },
         mounted: function () {
@@ -346,7 +373,48 @@
                 deep: true
             }
         },
+        computed: {
+            currentSlice() {
+                return this.displayListing.slice(this.start, this.end);
+            },
+            nestedSlices() {
+                if (this.shouldPaginate) {
+                    let songsSeen = 0;
+                    const discs = [];
+
+                    for (const disc of this.nestedPlaylist) {
+                        songsSeen += disc.tracks.length;
+
+                        if (songsSeen >= this.end) {
+                            discs.push({
+                                disc: disc.disc,
+                                tracks: disc.tracks.slice(0, this.end + disc.tracks.length - songsSeen)
+                            })
+                            break;
+                        } else if (songsSeen > this.start) {
+                            discs.push({
+                                disc: disc.disc,
+                                tracks: disc.tracks.slice(this.start - songsSeen)
+                            })
+                        }
+                    }
+
+                    return discs;
+                } else {
+                    return this.nestedPlaylist
+                }
+            },
+            shouldPaginate() {
+                const result = this.data.relationships.tracks.data.length > this.pageSize
+                console.log(result)
+                return result
+            }
+        },
         methods: {
+            onRangeChange(newRange) {
+                this.start = newRange[0];
+                this.end = newRange[1];
+            },
             isAlbum() {
                 return (this.data.attributes?.playParams?.kind ?? this.data.type ?? '').includes('album')
             },
@@ -372,6 +440,8 @@
             },
             generateNestedPlaylist(songlists) {
                 this.nestedPlaylist = [];
+                this.nestedDisplayLength = songlists.length;
+
                 if (this.data?.type?.includes("album")) {
                     let discs = songlists.map(x => {
                         return x.attributes.discNumber
diff --git a/src/renderer/views/pages/library-albums.ejs b/src/renderer/views/pages/library-albums.ejs
index 0b98c83b..7f161afa 100644
--- a/src/renderer/views/pages/library-albums.ejs
+++ b/src/renderer/views/pages/library-albums.ejs
@@ -46,17 +46,33 @@
                             </optgroup>
                         </select>
                     </div>
+                    <div class="col">
+                        <select class="md-select" v-model="prefs.scroll">
+                            <optgroup :label="app.getLz('term.scroll')">
+                                <option value="infinite">{{app.getLz('term.scroll.infinite')}}</option>
+                                <option value="paged">{{app.getLz('term.scroll.paged').replace("${songsPerPage}", pageSize)}}</option>
+                            </optgroup>
+                        </select>
+                    </div>
                 </div>
             </div>
         </div>
+        <pagination
+            :length="app.library.albums.displayListing.length
+            "
+            :pageSize="pageSize"
+            :scroll="prefs.scroll"
+            scrollSelector="#app-content"
+            @onRangeChange="onRangeChange"
+        />
         <div class="well">
             <div class="albums-square-container">
                 <div>
-                    <mediaitem-square v-if="prefs.viewAs == 'covers'" :size="'300'" :item="item" v-for="item in library.albums.displayListing">
+                    <mediaitem-square v-if="prefs.viewAs == 'covers'" :size="'300'" :item="item" v-for="item in currentSlice">
                     </mediaitem-square>
                 </div>
             </div>
-            <mediaitem-list-item v-if="prefs.viewAs == 'list'" :show-duration="false" :show-meta-data="true" :show-library-status="false" :item="item" v-for="item in library.albums.displayListing">
+            <mediaitem-list-item v-if="prefs.viewAs == 'list'" :show-duration="false" :show-meta-data="true" :show-library-status="false" :item="item" v-for="item in currentSlice">
             </mediaitem-list-item>
         </div>
     </div>
@@ -65,21 +81,34 @@
     Vue.component('cider-library-albums', {
         template: '#cider-library-albums',
         data: function () {
+            const pageSize = this.$root.cfg.libraryPrefs.pageSize;
             return {
                 library: this.$root.library,
                 mediaItemSize: "compact",
                 prefs: this.$root.cfg.libraryPrefs.albums,
-                app : this.$root
+                app: this.$root,
+                pageSize: pageSize,
+                start: 0,
+                end: pageSize
             }
         },
         mounted() {
             this.$root.getLibraryAlbumsFull(null, 1);
             this.$root.getAlbumSort();
             this.$root.searchLibraryAlbums(1);
-            this.$root.getLibrarySongsFull() ;
+            this.$root.getLibrarySongsFull();
             this.$root.searchLibraryAlbums(1);
         },
+        computed: {
+            currentSlice: function () {
+                return this.library.albums.displayListing.slice(this.start, this.end);
+            }
+        },
         methods: {
+            onRangeChange: function (newRange) {
+                this.start = newRange[0];
+                this.end = newRange[1];
+            }
         }
     });
 </script>
\ No newline at end of file
diff --git a/src/renderer/views/pages/library-songs.ejs b/src/renderer/views/pages/library-songs.ejs
index 589bc5ae..e1fc35f9 100644
--- a/src/renderer/views/pages/library-songs.ejs
+++ b/src/renderer/views/pages/library-songs.ejs
@@ -64,45 +64,13 @@
                     </button>
                 </div>
             </div>
-            <div class="row" style="margin-bottom: 16px" v-if="!isInfinite">
-                <button
-                    class="col md-btn page-btn"
-                    :disabled="currentPage === 1"
-                    @click="goToPage(1)"
-                >
-                    <img class="md-ico-first"/>
-                </button>
-                <button
-                    class="col md-btn page-btn prev"
-                    :disabled="currentPage === 1"
-                    @click="goToPrevious()"
-                >
-                    <img class="md-ico-prev"/>
-                </button>
-                <button
-                    :class="`col md-btn page-btn${ isCurrentPage(page) ? ' md-btn-primary': ''}`"
-                    @click="goToPage(page)"
-                    v-for="page in pagesToShow"
-                >{{ page }}</button>
-                <button
-                    class="col md-btn page-btn next"
-                    :disabled="currentPage === numPages"
-                    @click="goToNext()"
-                >
-                    <img class="md-ico-next"/>
-                </button>
-                <button
-                    class="col md-btn page-btn last"
-                    :disabled="currentPage === numPages"
-                    @click="goToEnd()"
-                >
-                    <img class="md-ico-last"/>
-                </button>
-                <div class="col page-btn" style="min-width: 12em;">
-                    <input type="number" min="1" :max="numPages" :value="currentPage" @change="changePage" />
-                    <span>/ {{ numPages }}</span>
-                </div>
-            </div>
+            <pagination
+                :length="library.songs.displayListing.length"
+                :pageSize="pageSize"
+                :scroll="prefs.scroll"
+                scrollSelector="#app-content"
+                @onRangeChange="onRangeChange"
+            />
         </div>
 
         <div v-if="library.songs.downloadState == 3">Library contains no songs.</div>
@@ -119,125 +87,31 @@
     Vue.component('cider-library-songs', {
         template: '#cider-library-songs',
         data: function () {
+            const pageSize = this.$root.cfg.libraryPrefs.pageSize;
             return {
                 // currentPage is oneIndexed
-                currentPage: 1,
                 library: this.$root.library,
                 mediaItemSize: "compact",
-                pageSize: 250,
                 prefs: this.$root.cfg.libraryPrefs.songs,
-                app: this.$root
+                app: this.$root,
+                pageSize: pageSize,
+                start: 0,
+                end: pageSize
             }
         },
         mounted() {
-            document.querySelector("#app-content")
-                .addEventListener("scroll", this.handleScroll)
             this.$root.getLibrarySongsFull()
         },
-        destroyed() {
-            document.querySelector("#app-content")
-                .removeEventListener("scroll", this.handleScroll)
-        },
-        watch: {
-            'library.songs.displayListing.length': function () {
-                if (this.isInfinite) {
-                    // If a search reduces the number of things to show, we want to limit
-                    // the number of songs shown as well. This is to prevent you scrolling
-                    // to load your entire library, searching for one song, and then having
-                    // th re-render the entire library
-                    if (this.currentPage > this.numPages) {
-                        this.currentPage = this.numPages;
-                    }
-                }
-            },
-            'prefs.scroll': function () {
-                // When changing modes, set the page to 1. This is primarily to
-                // prevent going to a high page (e.g., 50) and then switching to infinite
-                // and showing 12.5k songs
-                this.currentPage = 1;
-            }
-        },
         computed: {
-            isInfinite: function () {
-                return this.prefs.scroll === "infinite"
-            },
             currentSlice: function () {
-                if (this.isInfinite) {
-                    return this.library.songs.displayListing.slice(
-                        0, this.currentPage * this.pageSize
-                    );
-                } else {
-                    const startingPage = Math.min(this.numPages, this.currentPage);
-
-                    return this.library.songs.displayListing.slice(
-                        (startingPage - 1) * this.pageSize,
-                        startingPage * this.pageSize
-                    );
-                }
-            },
-            numPages: function () {
-                return Math.ceil(this.library.songs.displayListing.length / this.pageSize) || 1;
-            },
-            pagesToShow: function () {
-                let start = this.currentPage - 2;
-                let end = this.currentPage + 2;
-
-                if (start < 1) {
-                    end += (1 - start);
-                    start = 1;
-                }
-
-                const endDifference = end - this.numPages;
-                if (endDifference > 0) {
-                    end = this.numPages;
-                    start = Math.max(1, start - endDifference);
-                }
-
-                const array = [];
-                for (let idx = start; idx <= end; idx++) {
-                    array.push(idx);
-                }
-                return array;
+                return this.library.songs.displayListing.slice(this.start, this.end);
             }
         },
         methods: {
-            // Infinite Scrolling
-            handleScroll: function (event) {
-                if (this.isInfinite &&
-                    this.currentPage < this.numPages &&
-                    event.target.scrollTop >= event.target.scrollHeight - event.target.clientHeight) {
-                    this.currentPage += 1;
-                }
+            onRangeChange: function (newRange) {
+                this.start = newRange[0];
+                this.end = newRange[1];
             },
-            // Pagination
-            isCurrentPage: function (idx) {
-                return idx === this.currentPage ||
-                    (idx === this.numPages && this.currentPage > this.numPages);
-            },
-            changePage: function (event) {
-                const value = event.target.valueAsNumber;
-
-                if (!isNaN(value) && value >= 1 && value <= this.numPages) {
-                    this.currentPage = value;
-                }
-            },
-            goToPage: function (page) {
-                this.currentPage = page;
-            },
-            goToPrevious: function () {
-                if (this.currentPage > 1) {
-                    this.currentPage -= 1;
-                }
-            },
-            goToNext: function () {
-                if (this.currentPage < this.numPages) {
-                    this.currentPage += 1;
-                }
-            },
-            goToEnd: function () {
-                this.currentPage = this.numPages;
-            },
-            // Miscellaneous
             play: function () {
                 function shuffleArray(array) {
                     for (var i = array.length - 1; i > 0; i--) {