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;
}
}
}
(C) Æliens 27/08/2009
You may not copy or print any of this material without explicit permission of the author or the publisher. In case of other copyright issues, contact the author.
