Add menu, ugly looking for now

Views/Menu.cs

@@ -0,0 +1,245 @@
+using System;
+namespace Terminal {
+
+	/// <summary>
+	/// A menu item has a title, an associated help text, and an action to execute on activation.
+	/// </summary>
+	public class MenuItem {
+		public MenuItem (string title, string help, Action action)
+		{
+			Title = title ?? "";
+			Help = help ?? "";
+			Action = action;
+			Width = Title.Length + Help.Length + 1;
+		}
+		public string Title { get; set; }
+		public string Help { get; set; }
+		public Action Action { get; set; }
+		public int Width { get; set; }
+	}
+
+	/// <summary>
+	/// A menu bar item contains other menu items.
+	/// </summary>
+	public class MenuBarItem {
+		public MenuBarItem (string title, MenuItem [] children)
+		{
+			Title = title ?? "";
+			Children = children;
+		}
+
+		public string Title { get; set; }
+		public MenuItem [] Children { get; set; }
+		public int Current { get; set; }
+	}
+
+	/// <summary>
+	/// A menu bar for your application.
+	/// </summary>
+	public class MenuBar : View {
+		public MenuBarItem [] Menus { get; set; }
+		int selected;
+		Action action;
+
+		public MenuBar (MenuBarItem [] menus) : base (new Rect (0, 0, Application.Driver.Cols, 1))
+		{
+			Menus = menus;
+			CanFocus = false;
+			selected = -1;
+		}
+
+		/// <summary>
+		///   Activates the menubar
+		/// </summary>
+		public void Activate (int idx)
+		{
+			if (idx < 0 || idx > Menus.Length)
+				throw new ArgumentException ("idx");
+
+			action = null;
+			selected = idx;
+
+			foreach (var m in Menus)
+				m.Current = 0;
+
+			// TODO: Application.Run (this);
+			selected = -1;
+			SuperView.SetNeedsDisplay ();
+
+			if (action != null)
+				action ();
+		}
+
+		void DrawMenu (int idx, int col, int line)
+		{
+			int max = 0;
+			var menu = Menus [idx];
+
+			if (menu.Children == null)
+				return;
+
+			foreach (var m in menu.Children) {
+				if (m == null)
+					continue;
+
+				if (m.Width > max)
+					max = m.Width;
+			}
+			max += 4;
+			DrawFrame (new Rect (col, line, max, menu.Children.Length + 2), true);
+			for (int i = 0; i < menu.Children.Length; i++) {
+				var item = menu.Children [i];
+
+				Move (line + 1 + i, col + 1);
+				Driver.SetAttribute (item == null ? Colors.Base.Focus : i == menu.Current ? Colors.Menu.MarkedSelected : Colors.Menu.Marked);
+				for (int p = 0; p < max - 2; p++)
+					if (item == null)
+						Driver.AddSpecial (SpecialChar.HLine);
+					else
+						Driver.AddCh (' ');
+
+				if (item == null)
+					continue;
+
+				Move (line + 1 + i, col + 2);
+				DrawHotString (item.Title,
+				               i == menu.Current ? Colors.Menu.HotFocus: Colors.Menu.HotNormal,
+				               i == menu.Current ? Colors.Menu.MarkedSelected : Colors.Menu.Marked);
+
+				// The help string
+				var l = item.Help.Length;
+				Move (col + max - l - 2, line + 1 + i); 
+				Driver.AddStr (item.Help);
+			}
+		}
+
+		public override void Redraw (Rect region)
+		{
+			Move (0, 0);
+			Driver.SetAttribute (Colors.Base.Focus);
+			for (int i = 0; i < Frame.Width; i++)
+				Driver.AddCh (' ');
+
+			Move (1, 0);
+			int pos = 0;
+			for (int i = 0; i < Menus.Length; i++) {
+				var menu = Menus [i];
+				if (i == selected) {
+					DrawMenu (i, pos, 1);
+					Driver.SetAttribute (Colors.Menu.MarkedSelected);
+				} else
+					Driver.SetAttribute (Colors.Menu.Focus);
+
+				Move (pos, 0);
+				Driver.AddCh (' ');
+				Driver.AddStr(menu.Title);
+				Driver.AddCh (' ');
+				if (HasFocus && i == selected)
+					Driver.SetAttribute (Colors.Menu.MarkedSelected);
+				else
+					Driver.SetAttribute (Colors.Menu.Marked);
+				Driver.AddStr ("  ");
+
+				pos += menu.Title.Length + 4;
+			}
+			PositionCursor ();
+		}
+
+		public override void PositionCursor ()
+		{
+			int pos = 0;
+			for (int i = 0; i < Menus.Length; i++) {
+				if (i == selected) {
+					pos++;
+					Move (pos, 0);
+					return;
+				} else {
+					pos += Menus [i].Title.Length + 4;
+				}
+			}
+			Move (0, 0);
+		}
+
+		void Selected (MenuItem item)
+		{
+			// TODO: Running = false;
+			action = item.Action;
+		}
+
+		public override bool ProcessKey (KeyEvent kb)
+		{
+			switch (kb.Key) {
+			case Key.CursorUp:
+				if (Menus [selected].Children == null)
+					return false;
+
+				int current = Menus [selected].Current;
+				do {
+					current--;
+					if (current < 0)
+						current = Menus [selected].Children.Length - 1;
+				} while (Menus [selected].Children [current] == null);
+				Menus [selected].Current = current;
+
+				SetNeedsDisplay ();
+				return true;
+
+			case Key.CursorDown:
+				if (Menus [selected].Children == null)
+					return false;
+
+				do {
+					Menus [selected].Current = (Menus [selected].Current + 1) % Menus [selected].Children.Length;
+				} while (Menus [selected].Children [Menus [selected].Current] == null);
+
+				SetNeedsDisplay ();
+				break;
+
+			case Key.CursorLeft:
+				selected--;
+				if (selected < 0)
+					selected = Menus.Length - 1;
+				break;
+			case Key.CursorRight:
+				selected = (selected + 1) % Menus.Length;
+				break;
+
+			case Key.Enter:
+				if (Menus [selected].Children == null)
+					return false;
+
+				Selected (Menus [selected].Children [Menus [selected].Current]);
+				break;
+
+			case Key.Esc:
+			case Key.ControlC:
+				//TODO: Running = false;
+				break;
+
+			default:
+				var key = kb.KeyValue;
+				if ((key >= 'a' && key <= 'z') || (key >= 'A' && key <= 'Z') || (key >= '0' && key <= '9')) {
+					char c = Char.ToUpper ((char)key);
+
+					if (Menus [selected].Children == null)
+						return false;
+
+					foreach (var mi in Menus [selected].Children) {
+						int p = mi.Title.IndexOf ('_');
+						if (p != -1 && p + 1 < mi.Title.Length) {
+							if (mi.Title [p + 1] == c) {
+								Selected (mi);
+								return true;
+							}
+						}
+					}
+				}
+
+				return false;
+			}
+			SetNeedsDisplay ();
+			return true;
+		}
+	}
+
+}