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https://github.com/gui-cs/Terminal.Gui.git
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* touching publish.yml * Moved Examples into ./Examples * Moved Benchmarks into ./Tests * Moved Benchmarks into ./Tests * Moved UICatalog into ./Examples * Moved UICatalog into ./Examples 2 * Moved tests into ./Tests * Updated nuget
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246
Examples/UICatalog/Scenarios/Threading.cs
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246
Examples/UICatalog/Scenarios/Threading.cs
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using System;
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using System.Collections.ObjectModel;
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using System.Threading;
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using System.Threading.Tasks;
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using Terminal.Gui;
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namespace UICatalog.Scenarios;
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[ScenarioMetadata ("Threading", "Demonstration of how to use threading in different ways")]
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[ScenarioCategory ("Threading")]
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public class Threading : Scenario
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{
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private readonly ObservableCollection<string> _log = [];
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private Action _action;
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private Button _btnActionCancel;
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private CancellationTokenSource _cancellationTokenSource;
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private EventHandler _handler;
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private ListView _itemsList;
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private Action _lambda;
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private ListView _logJob;
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private Action _sync;
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public override void Main ()
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{
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Application.Init ();
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var win = new Window { Title = GetQuitKeyAndName () };
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_action = LoadData;
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_lambda = async () =>
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{
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_itemsList.Source = null;
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LogJob ("Loading task lambda");
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ObservableCollection<string> items = await LoadDataAsync ();
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LogJob ("Returning from task lambda");
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await _itemsList.SetSourceAsync (items);
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};
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_handler = async (s, e) =>
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{
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_itemsList.Source = null;
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LogJob ("Loading task handler");
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ObservableCollection<string> items = await LoadDataAsync ();
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LogJob ("Returning from task handler");
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await _itemsList.SetSourceAsync (items);
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};
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_sync = () =>
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{
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_itemsList.Source = null;
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LogJob ("Loading task synchronous");
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ObservableCollection<string> items =
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["One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten"];
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LogJob ("Returning from task synchronous");
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_itemsList.SetSource (items);
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};
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_btnActionCancel = new Button { X = 1, Y = 1, Text = "Cancelable Load Items" };
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_btnActionCancel.Accepting += (s, e) => Application.Invoke (CallLoadItemsAsync);
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win.Add (new Label { X = Pos.X (_btnActionCancel), Y = Pos.Y (_btnActionCancel) + 4, Text = "Data Items:" });
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_itemsList = new ListView
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{
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X = Pos.X (_btnActionCancel),
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Y = Pos.Y (_btnActionCancel) + 6,
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Width = 10,
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Height = 10,
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ColorScheme = Colors.ColorSchemes ["TopLevel"]
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};
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win.Add (new Label { X = Pos.Right (_itemsList) + 10, Y = Pos.Y (_btnActionCancel) + 4, Text = "Task Logs:" });
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_logJob = new ListView
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{
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X = Pos.Right (_itemsList) + 10,
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Y = Pos.Y (_itemsList),
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Width = 50,
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Height = Dim.Fill (),
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ColorScheme = Colors.ColorSchemes ["TopLevel"],
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Source = new ListWrapper<string> (_log)
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};
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var text = new TextField { X = 1, Y = 3, Width = 100, Text = "Type anything after press the button" };
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var btnAction = new Button { X = 80, Y = 10, Text = "Load Data Action" };
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btnAction.Accepting += (s, e) => _action.Invoke ();
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var btnLambda = new Button { X = 80, Y = 12, Text = "Load Data Lambda" };
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btnLambda.Accepting += (s, e) => _lambda.Invoke ();
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var btnHandler = new Button { X = 80, Y = 14, Text = "Load Data Handler" };
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btnHandler.Accepting += (s, e) => _handler.Invoke (null, EventArgs.Empty);
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var btnSync = new Button { X = 80, Y = 16, Text = "Load Data Synchronous" };
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btnSync.Accepting += (s, e) => _sync.Invoke ();
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var btnMethod = new Button { X = 80, Y = 18, Text = "Load Data Method" };
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btnMethod.Accepting += async (s, e) => await MethodAsync ();
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var btnClearData = new Button { X = 80, Y = 20, Text = "Clear Data" };
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btnClearData.Accepting += (s, e) =>
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{
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_itemsList.Source = null;
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LogJob ("Cleaning Data");
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};
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var btnQuit = new Button { X = 80, Y = 22, Text = "Quit" };
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btnQuit.Accepting += (s, e) => Application.RequestStop ();
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win.Add (
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_itemsList,
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_btnActionCancel,
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_logJob,
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text,
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btnAction,
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btnLambda,
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btnHandler,
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btnSync,
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btnMethod,
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btnClearData,
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btnQuit
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);
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void Win_Loaded (object sender, EventArgs args)
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{
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_btnActionCancel.SetFocus ();
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win.Loaded -= Win_Loaded;
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}
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win.Loaded += Win_Loaded;
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Application.Run (win);
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win.Dispose ();
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Application.Shutdown ();
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}
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private async void CallLoadItemsAsync ()
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{
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_cancellationTokenSource = new CancellationTokenSource ();
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_itemsList.Source = null;
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LogJob ("Clicked the button");
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if (_btnActionCancel.Text != "Cancel")
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{
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_btnActionCancel.Text = "Cancel";
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}
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else
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{
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_btnActionCancel.Text = "Cancelable Load Items";
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await _cancellationTokenSource.CancelAsync ();
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}
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try
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{
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if (_cancellationTokenSource.Token.IsCancellationRequested)
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{
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_cancellationTokenSource.Token.ThrowIfCancellationRequested ();
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}
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LogJob ($"Calling task Thread:{Thread.CurrentThread.ManagedThreadId} {DateTime.Now}");
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ObservableCollection<string> items = await Task.Run (LoadItemsAsync, _cancellationTokenSource.Token);
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if (!_cancellationTokenSource.IsCancellationRequested)
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{
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LogJob (
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$"Returned from task Thread:{Thread.CurrentThread.ManagedThreadId} {DateTime.Now}"
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);
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await _itemsList.SetSourceAsync (items);
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LogJob (
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$"Finished populate list view Thread:{Thread.CurrentThread.ManagedThreadId} {DateTime.Now}"
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);
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_btnActionCancel.Text = "Cancelable Load Items";
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}
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else
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{
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LogJob ("Task was canceled!");
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}
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}
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catch (OperationCanceledException ex)
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{
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LogJob (ex.Message);
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}
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}
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private async void LoadData ()
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{
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_itemsList.Source = null;
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LogJob ("Loading task");
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ObservableCollection<string> items = await LoadDataAsync ();
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LogJob ("Returning from task");
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await _itemsList.SetSourceAsync (items);
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}
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private async Task<ObservableCollection<string>> LoadDataAsync ()
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{
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_itemsList.Source = null;
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LogJob ("Starting delay");
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await Task.Delay (3000);
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LogJob ("Finished delay");
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return
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[
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"One",
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"Two",
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"Three",
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"Four",
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"Five",
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"Six",
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"Seven",
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"Eight",
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"Nine",
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"Ten",
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"Four",
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"Five",
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"Six",
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"Seven",
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"Eight",
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"Nine",
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"Ten"
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];
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}
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private async Task<ObservableCollection<string>> LoadItemsAsync ()
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{
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// Do something that takes lot of times.
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LogJob ($"Starting delay Thread:{Thread.CurrentThread.ManagedThreadId} {DateTime.Now}");
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await Task.Delay (5000);
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LogJob ($"Finished delay Thread:{Thread.CurrentThread.ManagedThreadId} {DateTime.Now}");
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return ["One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten"];
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}
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private void LogJob (string job)
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{
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_log.Add (job);
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_logJob.MoveDown ();
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}
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private async Task MethodAsync ()
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{
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_itemsList.Source = null;
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LogJob ("Loading task method");
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ObservableCollection<string> items = ["One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten"];
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await Task.Delay (3000);
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LogJob ("Returning from task method");
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await _itemsList.SetSourceAsync (items);
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_itemsList.SetNeedsDraw ();
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}
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}
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