private void AssyncImageReaderComplete(TileDownloader downloader)
{
TileDownloadState e = new TileDownloadState()
{
TileId = downloader.TileId,
TileBody = downloader.TileBody
};
downloader.Dispose();
this.UpdateTile(e);
}
internal void DownloadTile(TileId tileId)
{
IList <object> objects = null;
using (ManualResetEvent complete = new ManualResetEvent(false))
{
this.Dispatcher.BeginInvoke(new Action(() =>
{
objects = this.GetTileLayers(tileId.Level, tileId.X, tileId.Y);
complete.Set();
}));
complete.WaitOne();
}
if (objects.Count > 0)
{
Uri uri = objects[0] as Uri;
Stream stream = objects[0] as Stream;
if (uri != null)
{
TileDownloadState e = new TileDownloadState()
{
TileId = tileId,
Uri = uri,
Callback = this.AssyncImageCacheReader
};
this.GetCachedTileAsync(tileId.Level, tileId.X, tileId.Y, e.RaiseEvent);
}
else if (stream != null)
{
this.Dispatcher.BeginInvoke(new Action(() =>
{
TileDownloader tile = new TileDownloader(tileId, stream, this.AssyncImageReader);
tile.StartDownload();
}));
}
else
{
TileDownloadState e = new TileDownloadState()
{
TileId = tileId
};
this.UpdateTile(e);
}
}
}
private void UpdateTile(TileDownloadState e)
{
TilesDownloadManager manager = this.downloadManager;
if (manager != null)
{
TileSource tileSource = new TileSource(e.TileId, e.TileBody);
manager.UpdateRequest(tileSource);
if (e.TileBody != null && manager.ValidateTile(e.TileId))
{
this.OnTileAvailable();
}
e.Dispose();
}
}
private void AssyncImageCacheReader(TileDownloadState e)
{
TilesDownloadManager manager = this.downloadManager;
if (manager != null)
{
if (e.TileBody == null)
{
TileDownloader downloader = new TileDownloader(e.TileId, e.Uri, this.AssyncImageReader, manager.ValidateTile);
downloader.StartDownload(this.RequestCacheLevel, this.RequestCredentials, this.HttpUnauthorizedHandler);
}
else
{
this.UpdateTile(e);
}
}
}
