/// <summary>
/// Used by the worker thread to process items.
/// </summary>
private void Run()
{
while (!Stopping)
{
lock (lockObject)
{
// Wait until we have pending work items
if (paused || IsWorkQueueEmpty())
Monitor.Wait(lockObject);
}
// Loop until we exhaust the queue
bool queueFull = true;
while (queueFull && !Stopping && !Paused)
{
// Get an item from the queue
AsyncOperation asyncOp = null;
object request = null;
int priority = 0;
lock (lockObject)
{
// Check queues
Utility.Tuple<AsyncOperation, int> work = GetWork();
asyncOp = work.Item1;
priority = work.Item2;
if (asyncOp != null)
request = asyncOp.UserSuppliedState;
// Check if the item was removed
if (request != null && cancelledItems.ContainsKey(request))
request = null;
}
if (request != null)
{
Exception error = null;
object result = null;
bool cancel = false;
// Start the work
try
{
// Raise the do work event
QueuedWorkerDoWorkEventArgs doWorkArg = new QueuedWorkerDoWorkEventArgs(request, priority);
OnDoWork(doWorkArg);
result = doWorkArg.Result;
cancel = doWorkArg.Cancel;
}
catch (Exception e)
{
error = e;
}
// Raise the work complete event
QueuedWorkerCompletedEventArgs workCompletedArg = new QueuedWorkerCompletedEventArgs(request, result, priority, error, cancel);
if (!Stopping)
asyncOp.PostOperationCompleted(workCompletedCallback, workCompletedArg);
}
else if (asyncOp != null)
asyncOp.OperationCompleted();
// Check if the cache is exhausted
lock (lockObject)
{
queueFull = !IsWorkQueueEmpty();
}
}
}
}
/// <summary>
/// Raises the RunWorkerCompleted event.
/// </summary>
/// <param name="e">A <see cref="QueuedWorkerCompletedEventArgs"/> that contains event data.</param>
protected virtual void OnRunWorkerCompleted(QueuedWorkerCompletedEventArgs e)
{
if (RunWorkerCompleted != null)
RunWorkerCompleted(this, e);
}
/// <summary>
/// Handles the RunWorkerCompleted event of the queued background worker.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="Manina.Windows.Forms.QueuedWorkerCompletedEventArgs"/>
/// instance containing the event data.</param>
void bw_RunWorkerCompleted(object sender, QueuedWorkerCompletedEventArgs e)
{
CacheItem result = e.Result as CacheItem;
// We are done processing
processing.Remove (result.Extension);
// Add to cache
if (result != null) {
CacheItem existing = null;
if (shellCache.TryGetValue (result.Extension, out existing)) {
existing.Dispose ();
shellCache.Remove (result.Extension);
}
shellCache.Add (result.Extension, result);
}
// Refresh the control lazily
if (result != null && mImageListView != null)
mImageListView.Refresh (false, true);
}
/// <summary>
/// Handles the RunWorkerCompleted event of the queued background worker.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="Manina.Windows.Forms.QueuedWorkerCompletedEventArgs"/>
/// instance containing the event data.</param>
void bw_RunWorkerCompleted(object sender, QueuedWorkerCompletedEventArgs e)
{
CacheRequest request = e.UserState as CacheRequest;
CacheItem result = e.Result as CacheItem;
// We are done processing
if (request.RequestType == RequestType.Renderer)
processingRendererItem = Guid.Empty;
else if (request.RequestType == RequestType.Gallery)
processingGalleryItem = Guid.Empty;
else
processing.Remove(request.Guid);
// Do not process the result if the cache operation
// was cancelled.
if (e.Cancelled)
return;
// Dispose old item and add to cache
if (request.RequestType == RequestType.Renderer)
{
if (rendererItem != null)
rendererItem.Dispose();
rendererItem = result;
}
else if (request.RequestType == RequestType.Gallery)
{
if (galleryItem != null)
galleryItem.Dispose();
galleryItem = result;
}
else if (result != null)
{
CacheItem existing = null;
if (thumbCache.TryGetValue(result.Guid, out existing))
{
existing.Dispose();
thumbCache.Remove(result.Guid);
}
thumbCache.Add(result.Guid, result);
if (result.Image != null)
{
// Did the thumbnail size change while we were
// creating the thumbnail?
if (result.Size != mImageListView.ThumbnailSize)
result.State = CacheState.Unknown;
// Purge invisible items if we exceeded the cache limit
MemoryUsed += GetImageMemorySize(result.Image);
if (IsCacheLimitExceeded())
PurgeInvisible(true);
}
}
//Refresh the control
if (mImageListView != null)
{
if (request.RequestType != RequestType.Thumbnail || mImageListView.IsItemVisible(request.Guid))
mImageListView.Refresh(false, true);
}
// Raise the ThumbnailCached event
if (result != null && mImageListView != null)
mImageListView.OnThumbnailCachedInternal(result.Guid, result.Image, result.Size, request.RequestType == RequestType.Thumbnail);
// Raise the CacheError event
if (e.Error != null && mImageListView != null)
mImageListView.OnCacheErrorInternal(request.Guid, e.Error, CacheThread.Thumbnail);
}
/// <summary>
/// Handles the RunWorkerCompleted event of the queued background worker.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="Manina.Windows.Forms.QueuedWorkerCompletedEventArgs"/>
/// instance containing the event data.</param>
void bw_RunWorkerCompleted(object sender, QueuedWorkerCompletedEventArgs e)
{
CacheRequest request = e.UserState as CacheRequest;
// We are done processing
processing.Remove (request.Guid);
// Do not process the result if the cache operation
// was cancelled.
if (e.Cancelled)
return;
// Get result
Utility.Tuple<ColumnType, string, object>[] details = (Utility.Tuple<ColumnType, string, object>[])e.Result;
if (details != null && mImageListView != null)
{
mImageListView.UpdateItemDetailsInternal(request.Guid, details);
}
// Refresh the control lazily
if (mImageListView != null && mImageListView.IsItemVisible (request.Guid))
mImageListView.Refresh (false, true);
// Raise the CacheError event
if (e.Error != null && mImageListView != null)
mImageListView.OnCacheErrorInternal (request.Guid, e.Error, CacheThread.Details);
}
