implemented hotkey for cycling EVE clients

.gitignore

@@ -2,4 +2,5 @@ bin/
 obj/
 *.suo
 *.user
-*.DotSettings
+*.DotSettings
+packages/

Eve-O-Preview/Services/Implementation/ThumbnailManager.cs

@@ -1,7 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.Drawing;
+using System.Linq;
 using System.Threading.Tasks;
+using System.Windows.Forms;
 using System.Windows.Threading;
 using EveOPreview.Configuration;
 using EveOPreview.Mediator.Messages;
@@ -114,6 +116,7 @@ private async void UpdateThumbnailsList()
 				view.ThumbnailFocused = this.ThumbnailViewFocused;
 				view.ThumbnailLostFocus = this.ThumbnailViewLostFocus;
 				view.ThumbnailActivated = this.ThumbnailActivated;
+				view.NextThumbnailActivated = this.NextThumbnailActivated;
 				view.ThumbnailDeactivated = this.ThumbnailDeactivated;
 
 				view.RegisterHotkey(this._configuration.GetClientHotkey(view.Title));
@@ -410,6 +413,33 @@ private void ThumbnailActivated(IntPtr id)
 				}, TaskScheduler.FromCurrentSynchronizationContext());
 		}
 
+		private void NextThumbnailActivated()
+        {
+			if (this._activeClient.Handle == IntPtr.Zero || this._thumbnailViews.Count == 0)
+            {
+				return;
+            }
+
+			IThumbnailView currentView = this._thumbnailViews[this._activeClient.Handle];
+			var sortedViews = this._thumbnailViews.OrderBy(view => view.Key.ToInt32()).Select(view => view.Value).ToList();
+			var nextView = sortedViews.SkipWhile(view => view.Id != currentView.Id).Skip(1).DefaultIfEmpty(sortedViews[0]).FirstOrDefault();
+
+			if (nextView != null)
+            {
+				Task.Run(() =>
+				{
+					this._windowManager.ActivateWindow(nextView.Id);
+				})
+				.ContinueWith((task) =>
+				{
+					// This code should be executed on UI thread
+					this.SwitchActiveClient(nextView.Id, nextView.Title);
+					this.UpdateClientLayouts();
+					this.RefreshThumbnails();
+				}, TaskScheduler.FromCurrentSynchronizationContext());
+			}
+		}
+
 		private void ThumbnailDeactivated(IntPtr id, bool switchOut)
 		{
 			if (switchOut)

Eve-O-Preview/View/Implementation/ThumbnailView.cs

@@ -40,6 +40,7 @@ public abstract partial class ThumbnailView : Form, IThumbnailView
 		private Size _baseZoomMaximumSize;
 
 		private HotkeyHandler _hotkeyHandler;
+		private HotkeyHandler _nextHotkeyHandler;
 		#endregion
 
 		protected ThumbnailView(IWindowManager windowManager)
@@ -115,6 +116,8 @@ public Size ThumbnailSize
 
 		public Action<IntPtr> ThumbnailActivated { get; set; }
 
+		public Action NextThumbnailActivated { get; set; }
+
 		public Action<IntPtr, bool> ThumbnailDeactivated { get; set; }
 
 		public new void Show()
@@ -317,6 +320,10 @@ public void RegisterHotkey(Keys hotkey)
 			this._hotkeyHandler = new HotkeyHandler(this.Handle, hotkey);
 			this._hotkeyHandler.Pressed += HotkeyPressed_Handler;
 			this._hotkeyHandler.Register();
+
+			this._nextHotkeyHandler = new HotkeyHandler(this.Handle, Keys.Tab);
+			this._nextHotkeyHandler.Pressed += NextHotkeyPressed_Handler;
+			this._nextHotkeyHandler.Register();
 		}
 
 		public void UnregisterHotkey()
@@ -330,6 +337,11 @@ public void UnregisterHotkey()
 			this._hotkeyHandler.Pressed -= HotkeyPressed_Handler;
 			this._hotkeyHandler.Dispose();
 			this._hotkeyHandler = null;
+
+			this._nextHotkeyHandler.Unregister();
+			this._nextHotkeyHandler.Pressed -= NextHotkeyPressed_Handler;
+			this._nextHotkeyHandler.Dispose();
+			this._nextHotkeyHandler = null;
 		}
 
 		public void Refresh(bool forceRefresh)
@@ -499,10 +511,23 @@ private void MouseUp_Handler(object sender, MouseEventArgs e)
 
 		private void HotkeyPressed_Handler(object sender, HandledEventArgs e)
 		{
+			Console.WriteLine("HotkeyPressedHandler");
+
 			this.ThumbnailActivated?.Invoke(this.Id);
 
 			e.Handled = true;
 		}
+
+		private void NextHotkeyPressed_Handler(object sender, HandledEventArgs e)
+		{
+			Console.WriteLine("NextHotkeyPressedHandler");
+			Console.WriteLine(this.Title);
+
+			this.NextThumbnailActivated?.Invoke();
+
+			e.Handled = true;
+		}
+
 		#endregion
 
 		#region Custom Mouse mode

Eve-O-Preview/View/Interface/IThumbnailView.cs

@@ -36,6 +36,7 @@ public interface IThumbnailView : IView
 		Action<IntPtr> ThumbnailLostFocus { get; set; }
 
 		Action<IntPtr> ThumbnailActivated { get; set; }
+		Action NextThumbnailActivated { get; set; }
 		Action<IntPtr, bool> ThumbnailDeactivated { get; set; }
 	}
 }