251 lines
8.0 KiB
JavaScript
251 lines
8.0 KiB
JavaScript
if(Debug.debug)
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console.log("Loading: PlayerData.js");
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/* sprejme <video> tag (element) in seznam imen, ki se lahko pojavijo v razredih oz. id staršev.
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// vrne dimenzije predvajalnika (širina, višina)
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//
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// Na youtube v theater mode je razširitev rahlo pokvarjena. Video tag ostane večji od predvajalnika, ko se zapusti
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// celozaslonski način. Ta funkcija skuša to težavo rešiti tako, da poišče element predvajalnika, ki je zavit okoli videa.
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//
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// Funkcija izkorišča lastnost, da bi načeloma moral biti vsak zunanji element večji od notranjega. Najmanjši element od
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// <video> značke pa do korena drevesa bi tako moral biti predvajalnik.
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//
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// Če je podan seznam imen, potem funkcija vrne dimenzije prvega elementa, ki v id oz. razredu vsebuje katerokoli ime iz seznama
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//
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// | EN |
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//
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// accepts <video> tag (element) and list of names that can appear in id or class
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// returns player dimensions (width, height)
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//
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// Theater mode is mildly broken on youtube. <video> tag remains bigger than the player after leaving the fullscreen mode, and
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// there's nothing we can do about that. This function aims to solve the problem by finding the player element that's wrapped around
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// the <video> tag.
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//
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// In general, an outer tag should be bigger than the inner tag. Therefore the smallest element between <video> tag and the document
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// root should be the player.
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//
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// If list of names is provided, the function returns dimensions of the first element that contains any name from the list in either
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// id or class.
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*/
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class PlayerData {
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constructor(videoData) {
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this.videoData = videoData;
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this.video = videoData.video;
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this.element = undefined;
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this.dimensions = undefined;
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this.getPlayerDimensions();
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this.startChangeDetection();
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}
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static isFullScreen(){
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return ( window.innerHeight == window.screen.height && window.innerWidth == window.screen.width);
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}
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start(){
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this.startChangeDetection();
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}
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stop(){
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this.halted = true;
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this.stopChangeDetection();
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}
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destroy() {
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this.stopChangeDetection();
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}
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startChangeDetection(){
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this.scheduleGhettoWatcher();
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}
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stopChangeDetection(){
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clearTimeout(this.watchTimeout);
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}
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scheduleGhettoWatcher(timeout, force_reset) {
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if(! timeout){
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timeout = 100;
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}
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if(this.halted){
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return;
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}
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// don't allow more than 1 instance
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if(this.watchTimeout){
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clearTimeout(this.watchTimeout);
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}
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var ths = this;
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this.watchTimeout = setTimeout(function(){
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ths.watchTimeout = null;
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try{
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ths.ghettoWatcher();
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}catch(e){console.log("[PlayerData::scheduleGhettoWatcher] Scheduling failed. Error:",e)}
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ths = null;
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},
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timeout
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);
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}
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ghettoWatcher(){
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if(this.checkPlayerSizeChange()){
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if(Debug.debug){
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console.log("[uw::ghettoOnChange] change detected");
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}
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this.getPlayerDimensions();
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if(! this.element ){
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this.scheduleGhettoWatcher();
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return;
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}
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this.videoData.resizer.restore(); // note: this returns true if change goes through, false otherwise.
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this.scheduleGhettoWatcher();
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return;
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}
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// sem ter tja, checkPlayerSizeChange() ne zazna prehoda v celozaslonski način (in iz njega). Zato moramo
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// uporabiti dodatne trike.
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// sometimes, checkPlayerSizeChange might not detect a change to fullscreen. This means we need to
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// trick it into doing that
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if(this.dimensions.fullscreen != PlayerData.isFullScreen()) {
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if(Debug.debug){
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console.log("[PlayerData::ghettoWatcher] fullscreen switch detected (basic change detection failed)");
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}
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this.getPlayerDimensions();
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if(! this.element ){
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this.scheduleGhettoWatcher();
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return;
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}
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this.videoData.resizer.restore();
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}
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this.scheduleGhettoWatcher();
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}
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getPlayerDimensions(elementNames){
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// element names — reserved for future use. If element names are provided, this function should return first element that
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// has classname or id that matches at least one in the elementNames array.
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var element = this.video.parentNode;
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if(! element ){
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if(Debug.debug)
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console.log("[PlayerDetect::_pd_getPlayerDimensions] element is not valid, doing nothing.", element)
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this.element = undefined;
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this.dimensions = undefined;
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return;
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}
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var isFullScreen = PlayerData.isFullScreen();
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var trustCandidateAfterGrows = 2; // if candidate_width or candidate_height increases in either dimensions this many
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// times, we say we found our player. (This number ignores weird elements)
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// in case our <video> is bigger than player in one dimension but smaller in the other
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// if site is coded properly, player can't be wider than that
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var candidate_width = Math.max(element.offsetWidth, window.innerWidth);
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var candidate_height = Math.max(element.offsetHeight, window.innerHeight);
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var playerCandidateNode = element;
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try {
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var grows = trustCandidateAfterGrows;
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while(element != undefined){
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// odstranimo čudne elemente, ti bi pokvarili zadeve
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// remove weird elements, those would break our stuff
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if ( element.offsetWidth == 0 || element.offsetHeight == 0){
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element = element.parentNode;
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continue;
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}
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if ( element.offsetHeight <= candidate_height &&
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element.offsetWidth <= candidate_width ){
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// if we're in fullscreen, we only consider elements that are exactly as big as the monitor.
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if( ! isFullScreen ||
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(element.offsetWidth == window.innerWidth && element.offsetHeight == window.innerHeight) ){
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playerCandidateNode = element;
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candidate_width = element.offsetWidth;
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candidate_height = element.offsetHeight;
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grows = trustCandidateAfterGrows;
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if(Debug.debug){
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console.log("Found new candidate for player. Dimensions: w:", candidate_width, "h:",candidate_height, "node:", playerCandidateNode);
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}
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}
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}
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else if(grows --<= 0){
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if(Debug.debug && Debug.playerDetect){
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console.log("Current element grew in comparrison to the child. We probably found the player. breaking loop, returning current result");
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}
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break;
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}
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element = element.parentNode;
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}
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}
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catch (e) {
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console.log("pdeeee,",e);
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}
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if (isFullScreen && playerCandidateNode == element) {
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this.dimensions = {
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width: window.innerWidth,
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height: window.innerHeight,
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fullscreen: true
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}
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this.element = element;
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} else {
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this.dimensions = {
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width: candidate_width,
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height: candidate_height,
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fullscreen: isFullScreen
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};
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this.element = playerCandidateNode;
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}
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}
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checkPlayerSizeChange(){
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if(Debug.debug){
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if(this.element == undefined)
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console.log("[PlayerDetect] player size changed. reason: player element undefined");
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if(this.dimensions.fullscreen){
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if(! PlayerData.isFullScreen()){
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console.log("[PlayerDetect] player size changed. reason: exited fullscreen");
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}
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}
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if(! this.element)
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console.log("[PlayerDetect] player element isnt defined");
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if ( this.element &&
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( this.dimensions.width != this.element.offsetWidth ||
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this.dimensions.height != this.element.offsetHeight )
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){
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console.log("[PlayerDetect] player size changed. reason: dimension change. Old dimensions?", this.dimensions.width, this.dimensions.height, "new dimensions:", this.element.offsetWidth, this.element.offsetHeight);
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}
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}
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if(this.element == undefined){
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return true;
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} else if(this.dimensions.width != this.element.offsetWidth || this.dimensions.height != this.element.offsetHeight ){
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return true;
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}
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return false;
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}
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}
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