/// <summary>
/// replaces an enqueued request with an updated version of that request. Is the old request not found, then the replacement will be added normaly,
/// </summary>
/// <param name="toReplace"></param>
/// <param name="replacement"></param>
public void Replace(IPdfRequest toReplace, IPdfRequest replacement)
{
lock (synchronisationLock)
{
if (firstElement == null || firstElement.value.Priority < replacement.Priority)
{
firstElement = new QueueElement <IPdfRequest>(replacement, firstElement);
Monitor.Pulse(synchronisationLock);
}
else if (firstElement.value == toReplace)
{
firstElement.value = replacement;
}
else
{
QueueElement <IPdfRequest> element = firstElement;
while (element.next != null && element.next.value.Priority >= toReplace.Priority && element.next.value != toReplace)
{
element = element.next;
}
if (element.next != null && element.next.value == toReplace)
{
element.next.value = replacement;
}
else
{
element.next = new QueueElement <IPdfRequest>(replacement, element.next);
Monitor.Pulse(synchronisationLock);
}
}
}
}
public void CancelRequest(IPdfRequest request)
{
requestQueue.CancelRequest(request);
if (request.GetType().IsInstanceOfType(typeof(PdfLoadThumbnailRequest)))
{
thumbnailCache.CancelPendingRequest((PdfLoadThumbnailRequest)request);
}
else if (request.GetType().IsInstanceOfType(typeof(PdfGetPageRectRequest)))
{
pageCache.CancelPendingRequest((PdfGetPageRectRequest)request);
}
else if (request.GetType().IsInstanceOfType(typeof(PdfGetTextFragmentsRequest)))
{
textFragmentCache.CancelPendingRequest((PdfGetTextFragmentsRequest)request);
}
request.Cancel();
}
public void CancelRequest(IPdfRequest request)
{
lock (synchronisationLock)
{
if (firstElement == null)
{
return;
}
QueueElement <IPdfRequest> element = firstElement;
while (element.next != null)
{
if (element.next.value.Equals(request))
{
element.next = element.next.next;//remove request
return;
}
element = element.next;
}
}
}
public void Add(IPdfRequest request, bool overtakeRequestsWithSamePriority = false)
{
lock (synchronisationLock)
{
if (firstElement == null)
{
firstElement = new QueueElement <IPdfRequest>(request, null);
}
else
{
//traverse queue until we reach the location where to insert the request
QueueElement <IPdfRequest> element = firstElement;
while (element.next != null && (element.next.value.Priority >= request.Priority || (element.next.value.Priority > request.Priority)))
{
element = element.next;
}
//now insert request in between element and element.next
element.next = new QueueElement <IPdfRequest>(request, element.next);
}
Monitor.Pulse(synchronisationLock);
}
}
// source and targetrects may be empty! (due to crops with pages etc.)
public PdfDrawRequest Draw(int width, int height, Resolution resolution, int rotation, IDictionary <int, PdfSourceRect> pageRects, PdfViewerController.Viewport viewport)
{
IList <KeyValuePair <int, PdfSourceRect> > newPageRects = new List <KeyValuePair <int, PdfSourceRect> >();
foreach (int key in pageRects.Keys)
{
int newKey;
if (key - 1 < _pageOrder.Count)
{
newKey = _pageOrder[key - 1];
}
else
{
continue;
}
if (newKey > document.PageCount)
{
continue;
}
newPageRects.Add(new KeyValuePair <int, PdfSourceRect>(newKey, pageRects[key]));
}
PdfDrawRequest request = new PdfDrawRequest(new DrawArgs(width, height, resolution, rotation, newPageRects, viewport));
if (lastDrawRequest == null)
{
requestQueue.Add(request);
}
else
{
requestQueue.Replace(lastDrawRequest, request);
}
lastDrawRequest = request;
//add new draw request
return(request);
}
