/// <summary>
/// 获取图片
/// </summary>
/// <param name="url">图片地址</param>
/// <param name="action">图片生成后的回调</param>
/// <returns>默认图片</returns>
public virtual BitmapSource Get( string url, ImageCreateCallback action )
{
QueueItem item = new QueueItem() { Action = action, Url = url };
BackgroundWorker worker = null;
lock ( _waitingQueue ) {
_waitingQueue.Enqueue( item );
if ( !_isThreadActivated ) {
_isThreadActivated = true;
worker = new BackgroundWorker();
}
}
if ( worker != null ) {
worker.DoWork += ( ( send, ev ) => StartThread() );
worker.RunWorkerCompleted += ( ( s, e ) => {
lock ( _waitingQueue ) {
_isThreadActivated = false;
}
} );
worker.RunWorkerAsync();
}
return BitmapCache.DEFAULT_IMAGE;
}
public override BitmapSource Get( string url, ImageCreateCallback action )
{
BitmapSource retBitmap = null;
if ( _cache.Contains( url ) ) {
retBitmap = _cache.Load( url );
if ( retBitmap != null && action != null ) {
action( retBitmap );
return retBitmap;
}
}
return base.Get( url, action );
}
