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Use List replace ObservableCollection to have control toward Capacity

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弘韬 张 2021-01-20 17:49:39 +08:00
parent 1aa119d672
commit 9d126df225
1 changed files with 29 additions and 24 deletions
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53
Flow.Launcher/ViewModel/ResultsViewModel.cs
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@ -239,49 +239,50 @@ namespace Flow.Launcher.ViewModel
}
#endregion
public class ResultCollection : ObservableCollection<ResultViewModel>
public class ResultCollection : List<ResultViewModel>, INotifyCollectionChanged
{
private long editTime = 0;
private bool _suppressNotifying = false;
private CancellationToken _token;
protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
public event NotifyCollectionChangedEventHandler CollectionChanged;
protected void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
{
if (!_suppressNotifying)
{
base.OnCollectionChanged(e);
}
CollectionChanged(this, e);
}
public void BulkAddRange(IEnumerable<ResultViewModel> resultViews)
public void BulkAddAll(List<ResultViewModel> resultViews)
{
// suppress notifying before adding all element
_suppressNotifying = true;
foreach (var item in resultViews)
{
Add(item);
}
_suppressNotifying = false;
// manually update event
// wpf use directx / double buffered already, so just reset all won't cause ui flickering
AddRange(resultViews);
// can return because the list will be cleared next time updated, which include a reset event
if (_token.IsCancellationRequested)
return;
// manually update event
// wpf use directx / double buffered already, so just reset all won't cause ui flickering
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
public void AddRange(IEnumerable<ResultViewModel> Items)
private void AddAll(List<ResultViewModel> Items)
{
foreach (var item in Items)
{
if (_token.IsCancellationRequested)
return;
Add(item);
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, item));
}
}
public void RemoveAll()
public void RemoveAll(int Capacity = 512)
{
ClearItems();
Clear();
if (this.Capacity > 8000)
{
this.Capacity = Capacity;
}
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
/// <summary>
@ -296,15 +297,19 @@ namespace Flow.Launcher.ViewModel
if (editTime < 10 || newItems.Count < 30)
{
if (Count != 0) ClearItems();
AddRange(newItems);
if (Count != 0) RemoveAll(newItems.Count);
AddAll(newItems);
editTime++;
return;
}
else
{
Clear();
BulkAddRange(newItems);
BulkAddAll(newItems);
if (Capacity > 8000 && newItems.Count < 3000)
{
Capacity = newItems.Count;
}
editTime++;
}
}