ng-plyr
Version:
An HTML5 media player for developers, built using Angular, having interface similar to Youtube player.
170 lines • 18.5 kB
JavaScript
export class PlaylistItem {
constructor(media) {
this.media = media;
}
static hasSameMediaSrc(p1, p2) {
return p1.media.src === p2.media.src;
}
// Inquiry functions
hasNext() { return this.next ? true : false; }
hasPrev() { return this.prev ? true : false; }
}
export class Playlist {
constructor(item) {
this.itemCount = 0;
if (item) {
this.head = item;
this.updateTail(item);
}
}
static getLastItemFrom(item) {
while (item.hasNext()) {
item = item.next;
}
return item;
}
static getItemsCount(item) {
let count = 1;
while (item.hasNext()) {
item = item.next;
count++;
}
return count;
}
static mediaArrToPaylistItems(playlist) {
let pl = new PlaylistItem(playlist[playlist.length - 1]);
for (let i = playlist.length - 2; i >= 0; i--) {
let tempPl = new PlaylistItem(playlist[i]);
tempPl.next = pl;
pl.prev = tempPl;
pl = tempPl;
}
return pl;
}
// Reset this playlist
resetPlaylist() {
this.head = undefined;
this.tail = undefined;
this.current = undefined;
this.itemCount = 0;
}
// Initialize playlist with mediaItems
initializePlaylist(mediaItems) {
// Reseting
this.resetPlaylist();
// Adding new items to playlist
let playlistItems = Playlist.mediaArrToPaylistItems(mediaItems);
this.appendPlaylist(playlistItems);
this.current = this.head;
}
// Update head to add items at beginning
updateHead(item) {
let oldHead = this.head;
this.head = item;
this.itemCount++;
while (item.hasNext()) {
item = item.next;
this.itemCount++;
}
if (oldHead) {
oldHead.prev = item;
item.next = oldHead;
}
else {
this.tail = item;
}
}
// Update tail after item is added at end
updateTail(item) {
while (item.hasNext()) {
item = item.next;
this.itemCount++;
}
this.tail = item;
this.itemCount++;
}
// Add items at end
appendPlaylist(item, atHead) {
if (atHead)
return this.updateHead(item);
if (this.isEmpty()) {
this.head = item;
}
else if (this.tail) {
item.prev = this.tail;
this.tail.next = item;
}
this.updateTail(item);
}
// Append item after current, update tail if req, update itemCount
addNext(item) {
if (this.current) {
this.itemCount += Playlist.getItemsCount(item);
let tempNext = this.current.next;
item.prev = this.current;
this.current.next = item;
// Update links at end of item
let lastItem = Playlist.getLastItemFrom(item);
if (tempNext) {
tempNext.prev = lastItem;
lastItem.next = tempNext;
}
else {
this.tail = lastItem;
}
}
else {
this.appendPlaylist(item, true);
this.current = item;
}
}
// Remove an existing PlaylistItem from Playlist
remove(item) {
if (!this.contains(item))
return;
let prev = item.prev;
let next = item.next;
if (next) {
next.prev = prev;
}
if (prev) {
prev.next = next;
}
this.itemCount--;
return item.media;
}
// Inquiry functions
// Check if Playlist is empty
isEmpty() { return this.head ? false : true; }
// Check whether this playlist contains the item
contains(item) {
let start = this.head;
while (start) {
if (item === start)
return true;
start = start.next;
}
return false;
}
// Get PlaylistItem at index
getPlaylistItemAt(index) {
let item = this.head;
while (index > 0 && item?.hasNext()) {
item = item.next;
index--;
}
return item;
}
// Count number of items in this playlist
countPlaylistItems() {
let item = this.head;
let count = 0;
while (item) {
count++;
item = item.next;
}
this.itemCount = count;
return count;
}
}
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{ Media } from \"./media.model\";\r\n\r\nexport class PlaylistItem {\r\n    media:Media;\r\n    next?:PlaylistItem;\r\n    prev?:PlaylistItem;\r\n    \r\n    constructor(media:Media) {\r\n        this.media = media;\r\n    }\r\n\r\n    static hasSameMediaSrc(p1:PlaylistItem, p2:PlaylistItem) {\r\n        return p1.media.src === p2.media.src;\r\n    }\r\n    \r\n    // Inquiry functions\r\n    hasNext() { return this.next ? true : false; }\r\n\r\n    hasPrev() { return this.prev ? true : false; }\r\n}\r\n\r\nexport class Playlist {\r\n    id?:string;\r\n    // Current will store currently playing item, on stopping it will be null\r\n    current?:PlaylistItem;\r\n    head?:PlaylistItem;\r\n    tail?:PlaylistItem;\r\n    itemCount:number = 0;\r\n\r\n    constructor(item?:PlaylistItem) {\r\n        if (item) {\r\n            this.head = item;\r\n            this.updateTail(item);\r\n        }\r\n    }\r\n\r\n    static getLastItemFrom(item:PlaylistItem):PlaylistItem {\r\n        while (item.hasNext()) {\r\n            item = item.next!;\r\n        }\r\n        return item;\r\n    }\r\n\r\n    static getItemsCount(item:PlaylistItem):number {\r\n        let count = 1;\r\n        while (item.hasNext()) {\r\n            item = item.next!;\r\n            count++;\r\n        }\r\n        return count;\r\n    }\r\n\r\n    static mediaArrToPaylistItems(playlist:Media[]):PlaylistItem {\r\n        let pl = new PlaylistItem(playlist[playlist.length-1]);\r\n\t\tfor (let i = playlist.length-2; i>=0;  i--) {\r\n\t\t\tlet tempPl = new PlaylistItem(playlist[i]);\r\n\t\t\ttempPl.next = pl;\r\n\t\t\tpl.prev = tempPl;\r\n\t\t\tpl = tempPl;\r\n\t\t}\r\n        return pl;\r\n    }\r\n\r\n\r\n    // Reset this playlist\r\n    resetPlaylist() {\r\n        this.head = undefined;\r\n        this.tail = undefined;\r\n        this.current = undefined;\r\n        this.itemCount = 0;\r\n    }\r\n\r\n    // Initialize playlist with mediaItems\r\n    initializePlaylist(mediaItems:Media[]) {\r\n        // Reseting\r\n        this.resetPlaylist();\r\n        // Adding new items to playlist\r\n        let playlistItems = Playlist.mediaArrToPaylistItems(mediaItems);\r\n\t\tthis.appendPlaylist(playlistItems);\r\n        this.current = this.head;\r\n    }\r\n\r\n    // Update head to add items at beginning\r\n    updateHead(item:PlaylistItem) {\r\n        let oldHead = this.head;\r\n        this.head = item;\r\n        this.itemCount++;\r\n        while (item.hasNext()) {\r\n            item = item.next!;\r\n            this.itemCount++;\r\n        }\r\n        if (oldHead) {\r\n            oldHead.prev = item;\r\n            item.next = oldHead;\r\n        } else { this.tail = item; }\r\n    }\r\n\r\n    // Update tail after item is added at end\r\n    updateTail(item:PlaylistItem) {\r\n        while (item.hasNext()) {\r\n            item = item.next!;\r\n            this.itemCount++;\r\n        }\r\n        this.tail = item;\r\n        this.itemCount++;\r\n    }\r\n\r\n    // Add items at end\r\n    appendPlaylist(item:PlaylistItem, atHead?:boolean) {\r\n        if (atHead) return this.updateHead(item);\r\n        \r\n        if (this.isEmpty()) {\r\n            this.head = item;\r\n        } else if (this.tail) {\r\n            item.prev = this.tail;\r\n            this.tail.next = item;\r\n        }\r\n        this.updateTail(item);\r\n    }\r\n\r\n    // Append item after current, update tail if req, update itemCount\r\n    addNext(item:PlaylistItem) {\r\n        if (this.current) {\r\n            this.itemCount += Playlist.getItemsCount(item);\r\n            let tempNext = this.current.next;\r\n            item.prev = this.current;\r\n            this.current.next = item;\r\n            // Update links at end of item\r\n            let lastItem = Playlist.getLastItemFrom(item);\r\n            if (tempNext) {\r\n                tempNext.prev = lastItem;\r\n                lastItem.next = tempNext;\r\n            } else {\r\n                this.tail = lastItem;\r\n            }\r\n        } else {\r\n            this.appendPlaylist(item, true);\r\n            this.current = item;\r\n        }\r\n    }\r\n\r\n    // Remove an existing PlaylistItem from Playlist\r\n    remove(item:PlaylistItem) {\r\n        if (!this.contains(item)) return;\r\n        \r\n        let prev = item.prev;\r\n        let next = item.next;\r\n        if (next) { next.prev = prev; }\r\n        if (prev) { prev.next = next; }\r\n        this.itemCount--;\r\n        return item.media;\r\n    }\r\n    \r\n    // Inquiry functions\r\n    // Check if Playlist is empty\r\n    isEmpty():boolean { return this.head ? false : true; }\r\n\r\n    // Check whether this playlist contains the item\r\n    contains(item:PlaylistItem):boolean {\r\n        let start = this.head;\r\n        while(start) {\r\n            if (item === start) return true;\r\n            start = start.next;\r\n        }\r\n        return false;\r\n    }\r\n\r\n    // Get PlaylistItem at index\r\n    getPlaylistItemAt(index:number):PlaylistItem | undefined {\r\n        let item = this.head;\r\n        while (index > 0 && item?.hasNext()) {\r\n            item = item.next;\r\n            index--;\r\n        }\r\n        return item;\r\n    }\r\n\r\n    // Count number of items in this playlist\r\n    countPlaylistItems():number {\r\n        let item = this.head;\r\n        let count = 0;\r\n        while(item) {\r\n            count++;\r\n            item = item.next;\r\n        }\r\n        this.itemCount = count;\r\n        return count;\r\n    }\r\n}\r\n"]}