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Improved the behavior of the async virtual collection

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This commit is contained in:
Markus Ewald 2025-07-09 22:05:46 +02:00
parent 1d955c1506
commit 059c093ec3
2 changed files with 214 additions and 158 deletions
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27
Source/Collections/VirtualObservableReadOnlyList.cs
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@ -23,7 +23,6 @@ using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
#if !NO_SPECIALIZED_COLLECTIONS
using System.Collections.Specialized;
#endif
@ -597,19 +596,23 @@ namespace Nuclex.Avalonia.Collections {
this.assumedCount.HasValue,
"This method should only be called when item count is already known"
);
if(!this.fetchedPages[pageIndex]) {
int count = Math.Min(
this.assumedCount!.Value - (this.pageSize * pageIndex),
this.pageSize
);
int fetchedItemCount = FetchItems(this.typedList, pageIndex * this.pageSize, count);
if(fetchedItemCount < this.pageSize) {
this.assumedCount = pageIndex * this.pageSize + fetchedItemCount;
}
this.fetchedPages[pageIndex] = true;
// If the page is already fetched (or in flight), do nothing
if((pageIndex >= this.fetchedPages.Length) || this.fetchedPages[pageIndex]) {
return;
}
int count = Math.Min(
this.assumedCount!.Value - (this.pageSize * pageIndex),
this.pageSize
);
int fetchedItemCount = FetchItems(this.typedList, pageIndex * this.pageSize, count);
if(fetchedItemCount < this.pageSize) {
this.assumedCount = pageIndex * this.pageSize + fetchedItemCount;
}
this.fetchedPages[pageIndex] = true;
}
/// <summary>Number of items the collection believes it has</summary>