Migrate aurora-sharp-desktop

aurora-sharp-desktop/Aurora/Design/Views/BaseViewModel.cs

@@ -0,0 +1,104 @@
+using System;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Threading.Tasks;
+using Aurora.Models.Media;
+using Xamarin.Forms;
+using Aurora.Design.Views.Main;
+
+namespace Aurora.Design.Views
+{
+
+    public class BaseViewModel : INotifyPropertyChanged
+    {
+        public BaseViewModel()
+        {
+        }
+
+        #region Player 
+
+        /// <summary>
+        /// Command event handler for player play button
+        /// </summary>
+        public virtual void OnPlayButtonCommandExecute() { }
+        public virtual bool CanPlayButtonCommandExecute()
+        {
+            return true;
+        }
+
+        /// <summary>
+        /// Command event handler for player next button
+        /// </summary>
+        public virtual void OnNextButtonExecute() { }
+        public virtual bool CanNextButtonCommandExecute()
+        {
+            return true;
+        }
+
+        /// <summary>
+        /// Command event handler for player previous button
+        /// </summary>
+        public virtual void OnPreviousButtonExecute() { }
+        public virtual bool CanPreviousButtonCommandExecute()
+        {
+            return true;
+        }
+
+        /// <summary>
+        /// Delegate for interacting with main screen player control
+        /// </summary>
+        /// <value></value>
+        public SetPlayerDelegate ChangePlayerState { get; set; }
+
+        /// <summary>
+        /// Delegate for checking if main screen player control is currently playing
+        /// </summary>
+        /// <value></value>
+        public GetIsPlayingDelegate IsPlaying { get; set; }
+
+        public ShowModalDelegate ShowModal { get; set; }
+
+        public HideModalDelegate HideModal { get; set; }
+
+
+        #endregion Player
+
+        #region Lifecycle
+        /// <summary>
+        /// Called by main screen on view appearing
+        /// </summary>
+        /// <typeparam name="object"></typeparam>
+        /// <returns></returns>
+        public virtual Task OnActive() { return Task.FromResult<object>(null); }
+
+        /// <summary>
+        /// Called by main screen on view disappearing
+        /// </summary>
+        /// <typeparam name="object"></typeparam>
+        /// <returns></returns>
+        public virtual Task OnInactive() { return Task.FromResult<object>(null); }
+
+        #endregion
+
+        #region INotifyPropertyChanged Implementation
+        public bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
+        {
+            if (Object.Equals(storage, value))
+                return false;
+
+            storage = value;
+            OnPropertyChanged(propertyName);
+            return true;
+        }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+        public void OnPropertyChanged([CallerMemberName] string propertyName = "")
+        {
+            if (PropertyChanged == null)
+                return;
+
+            PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+        #endregion
+    }
+}