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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| using Dynamo.Logging; | ||
| using System; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
|
|
||
| namespace Dynamo.Wpf.Utilities | ||
| { | ||
| /// <summary> | ||
| /// The ActionDebouncer class offers a means to reduce the number of UI notifications for a specified time. | ||
| /// It is meant to be used in UI elements where too many UI updates can cause perfomance issues. | ||
| /// </summary> | ||
| internal class ActionDebouncer(ILogger logger) : IDisposable | ||
| { | ||
| private readonly ILogger logger = logger; | ||
| private CancellationTokenSource cts; | ||
|
|
||
| public void Cancel() | ||
| { | ||
| if (cts != null) | ||
| { | ||
| cts.Cancel(); | ||
| cts.Dispose(); | ||
| cts = null; | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Delays the "action" for a "timeout" number of milliseconds | ||
| /// The input Action will run on same syncronization context as the Debounce method call. | ||
| /// </summary> | ||
| /// <param name="timeout">Number of milliseconds to wait</param> | ||
| /// <param name="action">The action to execute after the timeout runs out.</param> | ||
| /// <returns>A task that finishes when the deboucing is cancelled or the input action has completed (successfully or not). Should be discarded in most scenarios.</returns> | ||
| public void Debounce(int timeout, Action action) | ||
| { | ||
| Cancel(); | ||
| cts = new CancellationTokenSource(); | ||
|
|
||
| Task.Delay(timeout, cts.Token).ContinueWith((t) => | ||
| { | ||
| try | ||
| { | ||
| if (t.Status == TaskStatus.RanToCompletion) | ||
| { | ||
| action(); | ||
| } | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| logger?.Log("Failed to run debounce action with the following error:"); | ||
| logger?.Log(ex.ToString()); | ||
| } | ||
| }, TaskScheduler.FromCurrentSynchronizationContext()); | ||
| } | ||
|
|
||
| public void Dispose() | ||
| { | ||
| Cancel(); | ||
| } | ||
| } | ||
| } |
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