Tab theme colours (#73)

2018-09-10 07:50:20 +02:00
1 parent eecc2e8243
commit c9d0cc7368
@@ -0,0 +1,124 @@
+using FluentTerminal.App.ViewModels.Utilities;
+using System;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace FluentTerminal.App.ViewModels.Infrastructure
+{
+    public class AsyncCommand : IAsyncCommand
+    {
+        public event EventHandler CanExecuteChanged;
+
+        private bool _isExecuting;
+        private readonly Func<Task> _execute;
+        private readonly Func<bool> _canExecute;
+        private readonly IErrorHandler _errorHandler;
+
+        public AsyncCommand(
+            Func<Task> execute,
+            Func<bool> canExecute = null,
+            IErrorHandler errorHandler = null)
+        {
+            _execute = execute;
+            _canExecute = canExecute;
+            _errorHandler = errorHandler;
+        }
+
+        public bool CanExecute()
+        {
+            return !_isExecuting && (_canExecute?.Invoke() ?? true);
+        }
+
+        public async Task ExecuteAsync()
+        {
+            if (CanExecute())
+            {
+                try
+                {
+                    _isExecuting = true;
+                    await _execute();
+                }
+                finally
+                {
+                    _isExecuting = false;
+                }
+            }
+
+            RaiseCanExecuteChanged();
+        }
+
+        public void RaiseCanExecuteChanged()
+        {
+            CanExecuteChanged?.Invoke(this, EventArgs.Empty);
+        }
+
+        #region Explicit implementations
+        bool ICommand.CanExecute(object parameter)
+        {
+            return CanExecute();
+        }
+
+        void ICommand.Execute(object parameter)
+        {
+            ExecuteAsync().FireAndForgetSafeAsync(_errorHandler);
+        }
+        #endregion
+    }
+
+    public class AsyncCommand<T> : IAsyncCommand<T>
+    {
+        public event EventHandler CanExecuteChanged;
+
+        private bool _isExecuting;
+        private readonly Func<T, Task> _execute;
+        private readonly Func<T, bool> _canExecute;
+        private readonly IErrorHandler _errorHandler;
+
+        public AsyncCommand(Func<T, Task> execute, Func<T, bool> canExecute = null, IErrorHandler errorHandler = null)
+        {
+            _execute = execute;
+            _canExecute = canExecute;
+            _errorHandler = errorHandler;
+        }
+
+        public bool CanExecute(T parameter)
+        {
+            return !_isExecuting && (_canExecute?.Invoke(parameter) ?? true);
+        }
+
+        public async Task ExecuteAsync(T parameter)
+        {
+            if (CanExecute(parameter))
+            {
+                try
+                {
+                    _isExecuting = true;
+                    await _execute(parameter);
+                }
+                finally
+                {
+                    _isExecuting = false;
+                }
+            }
+
+            RaiseCanExecuteChanged();
+        }
+
+        public void RaiseCanExecuteChanged()
+        {
+            CanExecuteChanged?.Invoke(this, EventArgs.Empty);
+        }
+
+        #region Explicit implementations
+        bool ICommand.CanExecute(object parameter)
+        {
+            return CanExecute((T)parameter);
+        }
+
+        void ICommand.Execute(object parameter)
+        {
+            ExecuteAsync((T)parameter).FireAndForgetSafeAsync(_errorHandler);
+        }
+        #endregion
+    }
+}