Feature/status bar

StandaloneExample/Program.cs

@@ -165,6 +165,14 @@ static void Close ()
 		MessageBox.ErrorQuery (50, 5, "Error", "There is nothing to close", "Ok");
 	}
 
+ 	static void Help() {
+		MessageBox.Query(50, 7, "Help", "This is a small help\nBe kind.", "Ok");
+ 	}
+
+	static void ExitProgram() {
+		if (Quit ()) Application.Top.Running = false;
+	}
+
 	public static Label ml;
 	static void Main ()
 	{
@@ -185,7 +193,7 @@ static void Main ()
 				new MenuItem ("_New", "Creates new file", NewFile),
 				new MenuItem ("_Open", "", null),
 				new MenuItem ("_Close", "", () => Close ()),
-				new MenuItem ("_Quit", "", () => { if (Quit ()) top.Running = false; })
+				new MenuItem ("_Quit", "^X", () => ExitProgram())
 			}),
 			new MenuBarItem ("_Edit", new MenuItem [] {
 				new MenuItem ("_Copy", "", null),
@@ -194,6 +202,14 @@ static void Main ()
 			})
 		});
 
+		var statusBar = new StatusBar(new StatusItem[] {
+			new StatusItem(Key.F1, "~F1~ Help", () => Help()),
+			new StatusItem(Key.F2, "~F2~ Load", null),
+			new StatusItem(Key.F3, "~F3~ Save", null),
+			new StatusItem(Key.ControlX, "~^X~ Quit", () => ExitProgram()),
+		});
+
+
 		ShowEntries (win);
 		int count = 0;
 		ml = new Label (new Rect (3, 17, 47, 1), "Mouse: ");
@@ -203,8 +219,8 @@ static void Main ()
 
 		win.Add (ml);
 
-		top.Add (win, menu);
-		top.Add (menu);
+		top.Add (win, menu, statusBar);
+
 		Application.Run ();
 	}
 }

StandaloneExample/StandaloneExample.csproj

@@ -7,6 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Terminal.Gui" Version="0.17.0" />
+    <ProjectReference Include="..\Terminal.Gui\Terminal.Gui.csproj" />
+    <!-- PackageReference Include="Terminal.Gui" Version="0.17.0" / -->
   </ItemGroup>
 </Project>

Terminal.Gui/Drivers/ConsoleDriver.cs

@@ -142,6 +142,10 @@ public class ColorScheme {
 		/// </summary>
 		public Attribute Normal;
 		/// <summary>
+		/// The default color for text, when the view is disabled.
+		/// </summary>
+		public Attribute Disabled;
+		/// <summary>
 		/// The color for text when the view has the focus.
 		/// </summary>
 		public Attribute Focus;

Terminal.Gui/Drivers/CursesDriver.cs

@@ -266,8 +266,9 @@ public override void Init (Action terminalResized)
 				Colors.Menu.Focus = Curses.A_BOLD | MakeColor (Curses.COLOR_WHITE, Curses.COLOR_BLACK);
 				Colors.Menu.HotNormal = Curses.A_BOLD | MakeColor (Curses.COLOR_YELLOW, Curses.COLOR_CYAN);
 				Colors.Menu.Normal = Curses.A_BOLD | MakeColor (Curses.COLOR_WHITE, Curses.COLOR_CYAN);
-
-				Colors.Dialog.Normal = MakeColor (Curses.COLOR_BLACK, Curses.COLOR_WHITE);
+                                Colors.Menu.Disabled = MakeColor(Curses.COLOR_WHITE, Curses.COLOR_CYAN);
+
+		                Colors.Dialog.Normal = MakeColor (Curses.COLOR_BLACK, Curses.COLOR_WHITE);
 				Colors.Dialog.Focus = MakeColor (Curses.COLOR_BLACK, Curses.COLOR_CYAN);
 				Colors.Dialog.HotNormal = MakeColor (Curses.COLOR_BLUE, Curses.COLOR_WHITE);
 				Colors.Dialog.HotFocus = MakeColor (Curses.COLOR_BLUE, Curses.COLOR_CYAN);

Terminal.Gui/Drivers/NetDriver.cs

@@ -144,6 +144,7 @@ public override void Init (Action terminalResized)
 			Colors.Menu.Focus = MakeColor (ConsoleColor.White, ConsoleColor.Black);
 			Colors.Menu.HotNormal = MakeColor (ConsoleColor.Yellow, ConsoleColor.Cyan);
 			Colors.Menu.Normal = MakeColor (ConsoleColor.White, ConsoleColor.Cyan);
+                        Colors.Menu.Disabled = MakeColor(ConsoleColor.DarkGray, ConsoleColor.Cyan);
 
 			Colors.Dialog.Normal = MakeColor (ConsoleColor.Black, ConsoleColor.Gray);
 			Colors.Dialog.Focus = MakeColor (ConsoleColor.Black, ConsoleColor.Cyan);

Terminal.Gui/Drivers/WindowsDriver.cs

@@ -742,6 +742,7 @@ public override void Init (Action terminalResized)
 			Colors.Menu.Focus = MakeColor (ConsoleColor.White, ConsoleColor.Black);
 			Colors.Menu.HotNormal = MakeColor (ConsoleColor.Yellow, ConsoleColor.Cyan);
 			Colors.Menu.Normal = MakeColor (ConsoleColor.White, ConsoleColor.Cyan);
+                        Colors.Menu.Disabled = MakeColor(ConsoleColor.DarkGray, ConsoleColor.Cyan);
 
 			Colors.Dialog.Normal = MakeColor (ConsoleColor.Black, ConsoleColor.Gray);
 			Colors.Dialog.Focus = MakeColor (ConsoleColor.Black, ConsoleColor.Cyan);

Terminal.Gui/Views/Menu.cs

@@ -25,11 +25,13 @@ public class MenuItem {
 		/// <param name="title">Title for the menu item.</param>
 		/// <param name="help">Help text to display.</param>
 		/// <param name="action">Action to invoke when the menu item is activated.</param>
-		public MenuItem (ustring title, string help, Action action)
+		/// <param name="canExecute">Function to determine if the action can currently be executred.</param>
+		public MenuItem (ustring title, string help, Action action, Func<bool> canExecute=null)
 		{
 			Title = title ?? "";
 			Help = help ?? "";
 			Action = action;
+                        CanExecute = canExecute;
 			bool nextIsHot = false;
 			foreach (var x in Title) {
 				if (x == '_')
@@ -76,6 +78,13 @@ public MenuItem (ustring title, string help, Action action)
 		/// </summary>
 		/// <value>Method to invoke.</value>
 		public Action Action { get; set; }
+
+                /// <summary>
+                /// Gets or sets the action to be invoked if the menu can be triggered
+                /// </summary>
+                /// <value>Function to determine if action is ready to be executed.</value>
+                public Func<bool> CanExecute { get; set; }
+
 		internal int Width => Title.Length + Help.Length + 1 + 2;
 	}
 
@@ -126,19 +135,24 @@ static Rect MakeFrame (int x, int y, MenuItem [] items)
 		{
 			int maxW = 0;
 
-			foreach (var item in items) {
+			foreach (var item in items)
+                        {
+                                if (item == null) continue;
 				var l = item.Width;
 				maxW = Math.Max (l, maxW);
 			}
+			return new Rect (x, y, maxW + 2, items.Length + 2);
+		}
 
+		void CalculateCurrentItem(MenuItem [] items) 
+		{
 			current = -1;
 			for (int i = 0; i < items.Length; i++) {
 				if (items [i] != null) {
 					current = i;
-					break;
+					return;
 				}
 			}
-			return new Rect (x, y, maxW + 2, items.Length + 2);
 		}
 
 		public Menu (MenuBar host, int x, int y, MenuBarItem barItems) : base (MakeFrame (x, y, barItems.Children))
@@ -147,6 +161,17 @@ public Menu (MenuBar host, int x, int y, MenuBarItem barItems) : base (MakeFrame
 			this.host = host;
 			ColorScheme = Colors.Menu;
 			CanFocus = true;
+			CalculateCurrentItem(barItems.Children);
+		}
+
+		internal Attribute DetermineColorSchemeFor(MenuItem item, int index) 
+		{
+			if (item!=null) 
+			{
+				if (index==current) return ColorScheme.Focus;
+				if (item.CanExecute!=null && !item.CanExecute()) return ColorScheme.Disabled;
+			}
+			return ColorScheme.Normal;
 		}
 
 		public override void Redraw (Rect region)
@@ -156,19 +181,31 @@ public override void Redraw (Rect region)
 
 			for (int i = 0; i < barItems.Children.Length; i++){
 				var item = barItems.Children [i];
-				Move (1, i+1);
-				Driver.SetAttribute (item == null ? Colors.Base.Focus : i == current ? ColorScheme.Focus : ColorScheme.Normal);
+        Driver.SetAttribute(item == null ? ColorScheme.Normal : i == current ? ColorScheme.Focus : ColorScheme.Normal);
+        if (item == null) {
+        	Move(0, i + 1);
+          Driver.AddRune(Driver.LeftTee);
+        } else {
+					Move(1, i+1);
+				}
+
 				for (int p = 0; p < Frame.Width-2; p++)
 					if (item == null)
 						Driver.AddRune (Driver.HLine);
 					else
 						Driver.AddRune (' ');
 
-				if (item == null)
-					continue;
-
-				Move (2, i + 1);
-				DrawHotString (item.Title,
+        if (item == null) {
+        	Move(region.Right-1, i + 1);
+          Driver.AddRune(Driver.RightTee);
+          continue;
+        }
+
+        Move (2, i + 1);
+				if (item.CanExecute != null && !item.CanExecute())
+        	DrawHotString (item.Title, ColorScheme.Disabled, ColorScheme.Disabled);
+				else
+					DrawHotString (item.Title,
 				               i == current? ColorScheme.HotFocus : ColorScheme.HotNormal,
 				               i == current ? ColorScheme.Focus : ColorScheme.Normal);
 
@@ -197,23 +234,30 @@ void Run (Action action)
 
 		public override bool ProcessKey (KeyEvent kb)
 		{
+                        bool disabled;
 			switch (kb.Key) {
 			case Key.CursorUp:
 				if (current == -1)
 					break;
 				do {
+		      disabled = false;
 					current--;
 					if (current < 0)
 						current = barItems.Children.Length - 1;
-				} while (barItems.Children [current] == null)
+          var item = barItems.Children[current];
+          if (item!=null && item.CanExecute != null && !item.CanExecute()) disabled = true;
+				} while (barItems.Children [current] == null || disabled);
 				SetNeedsDisplay ();
 				break;
 			case Key.CursorDown:
 				do {
+					disabled = false;
 					current++;
 					if (current == barItems.Children.Length)
 						current = 0;
-				} while (barItems.Children [current] == null)
+					var item = barItems.Children[current];
+          if (item !=null && item.CanExecute != null && !item.CanExecute()) disabled = true;
+				} while (barItems.Children [current] == null || disabled);
 				SetNeedsDisplay ();
 				break;
 			case Key.CursorLeft:
@@ -315,7 +359,7 @@ public override void Redraw (Rect region)
 				var menu = Menus [i];
 				Move (pos, 0);
 				Attribute hotColor, normalColor;
-				if (i == selected){
+				if (i == selected) {
 					hotColor = i == selected ? ColorScheme.HotFocus : ColorScheme.HotNormal;
 					normalColor = i == selected ? ColorScheme.Focus : ColorScheme.Normal;
 				} else {
@@ -421,38 +465,37 @@ internal void NextMenu ()
 			OpenMenu (selected);
 		}
 
-                internal bool FindAndOpenMenuByHotkey(KeyEvent kb)
-                {
-                    int pos = 0;
-                    var c = ((uint)kb.Key & (uint)Key.CharMask);
-	            for (int i = 0; i < Menus.Length; i++)
-                    {
-			    // TODO: this code is duplicated, hotkey should be part of the MenuBarItem
-                            var mi = Menus[i];
-                            int p = mi.Title.IndexOf('_');
-                            if (p != -1 && p + 1 < mi.Title.Length) {
-                                    if (mi.Title[p + 1] == c) {
-			                    OpenMenu(i);
-			                    return true;
-                                    }
-                            }
-                    }
-	            return false;
-                }
-
-	        public override bool ProcessHotKey (KeyEvent kb)
+    internal bool FindAndOpenMenuByHotkey(KeyEvent kb)
+    {
+    	int pos = 0;
+      var c = ((uint)kb.Key & (uint)Key.CharMask);
+	    for (int i = 0; i < Menus.Length; i++)
+      {
+			  // TODO: this code is duplicated, hotkey should be part of the MenuBarItem
+        var mi = Menus[i];
+        int p = mi.Title.IndexOf('_');
+        if (p != -1 && p + 1 < mi.Title.Length) {
+        	if (mi.Title[p + 1] == c) {
+				    OpenMenu(i);
+			  	  return true;
+        	}
+      	}
+      }
+	    return false;
+    }
+
+	  public override bool ProcessHotKey (KeyEvent kb)
 		{
 			if (kb.Key == Key.F9) {
 				StartMenu ();
 				return true;
 			}
 
-                        if (kb.IsAlt)
-                        {
-                            if (FindAndOpenMenuByHotkey(kb)) return true;
-                        }
-			var kc = kb.KeyValue;
+			if (kb.IsAlt) {
+				if (FindAndOpenMenuByHotkey(kb)) return true;
+			}
 
+			var kc = kb.KeyValue;
 			return base.ProcessHotKey (kb);
 		}