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This means that _playHeadPosition now has a record of the current position value. And what s more, you can change its value. To resume playing directly at the position that the music was stopped, just feed the current value of _playHeadPosition to the play method. The music will start playing from that point onward. _musicChannel = _music.play(_playHeadPosition); We now have an efficient system that allows the music to resume playing from where it was stopped. Couldn t we just have used the _musicChannel.position property directly to resume playing the sound _musicChannel = _music.play(_musicChannel.position); Yes, for just pausing and resuming a sound, that would work just fine. The only problem is that there s far more going on in this music player application than just starting or pausing, as you ll see in the next example.

Figure 1-6. Home page of Google Maps The home page http://maps.google.com is a view of North America. Like map.search.ch, the web application is multidimensional and combines a search with geographic information. Take the example where I am driving in to Montreal and want to know where a Starbucks coffee shop is. In the text box I type in Starbucks Montreal. The results are displayed in Figure 1-7.

Note The .NET Configuration Manager comes configured to be run independently of Enterprise Library by

The real usefulness of the _playHeadPosition variable pays off when you make the music play from a position other than the current position. The restart button sets the _playHeadPosition variable to 0, stops the music, and then starts playing it again from that point. Position zero is the start of the music. private function restartHandler(event:Event):void { if(_musicIsPlaying && _musicChannel != null) { _playHeadPosition = 0; _musicChannel.stop(); _musicChannel = _music.play(_playHeadPosition); } } } Remember that there s no way to change the value of _musicChannel.position, because it s read-only. But now that we ve forced the music to play from position zero, _musicChannel. position blindly follows along and acquires the new value automatically.

We can use this same bit of trickery to fast-forward and rewind the music. The rewind and fastforward handlers add and subtract 1000 milliseconds (1 second) to the current position, and then tell the music to resume playing from that new point.

Figure 1-7. The various Starbucks in Montreal The search results are presented by combining the addresses of the search results with a map. My search was Starbucks Montreal, and some Starbucks were found, which is good. However, also found was a Souvlaki Restaurant, and oddly, National Car and Truck Rental. What we are witnessing is an imperfect search due to imperfect data. In a perfect world, search strings are perfectly and concisely formulated on a perfectly organized database. However, with ever-growing databases that have ever-growing data, searches are not perfect because of time constraints, data organization, and scope. A creative multidimensional Ajax application is the site http://www.housingmaps.com. Housingmaps is an appropriate example because it is an early example of a Web 2.0 application. The purpose of Housingmaps is to allow a user to search for housing rentals. The rentals are based on data from Craigslist, and the maps are provided by Google. If I search for an apartment rental in Montreal, the resulting output is illustrated in Figure 1-8.

having its own instance of the Configuration Console. Combining the .NET Configuration Manager and Enterprise Library configuration assemblies is purely optional.

private function rewindHandler(event:Event):void { if(_musicChannel != null && _musicIsPlaying && _musicChannel.position - 1000 > 0) { _playHeadPosition = _musicChannel.position - 1000; _musicChannel.stop(); _musicChannel = _music.play(_playHeadPosition); } } private function fastForwardHandler(event:Event):void { if(_musicChannel != null && _musicIsPlaying && _musicChannel.position + 1000 < _music.length) { _playHeadPosition = _musicChannel.position + 1000; _musicChannel.stop(); _musicChannel = _music.play(_playHeadPosition); } } The other check these two handlers need to make is to ensure that the new rewind and fastforward values are actually valid for the length of the music. That means that they shouldn t be able to rewind to a position that s less than zero. if(_musicChannel != null && _musicIsPlaying && _musicChannel.position - 1000 > 0) { And similarly, you shouldn t be able to fast-forward to a position that s greater than the actual length of the music. if(_musicChannel != null && _musicIsPlaying && _musicChannel.position + 1000 < _music.length) { The Sound class has a property called length that tells you the total length of the sound in milliseconds. As you can see, this is a very simple system, but it works well.