topical media & game development

topical media & game development

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

actionscript-book-PlayList-com-example-programmingas3-playlist-PlayList.ax

actionscript-book-PlayList-com-example-programmingas3-playlist-PlayList.ax [swf] flex


  package com.example.programmingas3.playlist
  {
          import com.example.programmingas3.playlist.Song;
          import com.example.programmingas3.playlist.SortProperty;

Provides functionality for managing a sortable list of songs.


  
          public class @ax-actionscript-book-PlayList-com-example-programmingas3-playlist-PlayList
          {
                  // ------- Private variables -------
                  
                  private var _songs:Array;
                  private var _currentSort:SortProperty = null;
                  private var _needToSort:Boolean = false;
  
                  // ------- Constructor -------
                  
                  public function @ax-actionscript-book-PlayList-com-example-programmingas3-playlist-PlayList()
                  {
                          this._songs = new Array();
                          // set the initial sorting
                          this.sortList(SortProperty.TITLE);
                  }
  
                  // ------- Public Properties -------

Gets the list of songs


  
                  public function get songList():Array
                  {
                          // Sort the songs, if needed.
                          // For efficiency this is done here rather than, for instance, each time a song is added.
                          // That way if multiple songs are added in a batch, the list won't be sorted each time.
                          if (this._needToSort)
                          {
                                  // record the current sorting method
                                  var oldSort:SortProperty = this._currentSort;
                                  // clear out the current sort so that it will re-sort
                                  this._currentSort = null;
                                  this.sortList(oldSort);
                          }
                          return this._songs;
                  }
                  
  
                  // ------- Public Methods -------

Adds a song to the playlist


  
                  public function addSong(song:Song):void
                  {
                          this._songs.push(song);
                          this._needToSort = true;
                   }

Sorts the list of songs according to the specified property


  
                  public function sortList(sortProperty:SortProperty):void
                  {
                          if (sortProperty == this._currentSort)
                          {
                                  return;
                          }
  
                          var sortOptions:uint;
                          switch (sortProperty)
                          {
                                  case SortProperty.TITLE:
                                          sortOptions = Array.CASEINSENSITIVE;
                                          break;
                                  case SortProperty.ARTIST:
                                          sortOptions = Array.CASEINSENSITIVE;
                                          break;
                                  case SortProperty.YEAR:
                                          sortOptions = Array.NUMERIC;
                                          break;
                          }
                          
                          // perform the actual sorting of the data
                          this._songs.sortOn(sortProperty.propertyName, sortOptions);
                          
                          // save the current sort property
                          this._currentSort = sortProperty;
  
                          // record that the list is sorted
                          this._needToSort = false;
                  }
          }
  }

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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