From 4a0f4e3730f7991195283952523bf5e30d085646 Mon Sep 17 00:00:00 2001
From: BDisp <bd.bdisp@gmail.com>
Date: Sun, 29 Mar 2020 21:59:13 +0100
Subject: [PATCH] Added StatusBar from pr #201 with a  little change.

---
 Terminal.Gui/Views/StatusBar.cs | 126 ++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 Terminal.Gui/Views/StatusBar.cs

diff --git a/Terminal.Gui/Views/StatusBar.cs b/Terminal.Gui/Views/StatusBar.cs
new file mode 100644
index 000000000..adb619c28
--- /dev/null
+++ b/Terminal.Gui/Views/StatusBar.cs
@@ -0,0 +1,126 @@
+//
+// StatusBar.cs: a statusbar for an application
+//
+// Authors:
+//   Miguel de Icaza (miguel@gnome.org)
+//
+// TODO:
+//   Add mouse support
+//   Uses internals of Application
+using System;
+using NStack;
+
+namespace Terminal.Gui
+{
+	/// <summary>
+	/// A statusbar item has a title, a shortcut aka hotkey, and an action to execute on activation.
+	/// Such an item is ment to be as part of the global hotkeys of the application, which are available in the current context of the screen.
+	/// The colour of the text will be changed after each ~. Having an statusbar item with a text of `~F1~ Help` will draw *F1* as shortcut and 
+	/// *Help* as standard text.
+	/// </summary>
+	public class StatusItem
+	{
+		/// <summary>
+		/// Initializes a new <see cref="T:Terminal.Gui.StatusItem"/>.
+		/// </summary>
+		/// <param name="shortcut">Shortcut to activate the item.</param>
+		/// <param name="title">Title for the statusbar item.</param>
+		/// <param name="action">Action to invoke when the staturbar item is activated.</param>
+		public StatusItem(Key shortcut, ustring title, Action action) 
+		{
+			Title = title ?? "";
+			Shortcut = shortcut;
+			Action = action;
+		}
+
+		/// <summary>
+		/// This is the global setting that can be used as a global shortcut to invoke the action on the menu.
+		/// </summary>
+		public Key Shortcut { get; }
+
+		/// <summary>
+		/// Gets or sets the title.
+		/// </summary>
+		/// <value>The title.</value>
+		public ustring Title { get; }
+
+		/// <summary>
+		/// Gets or sets the action to be invoked when the statusbar item is triggered
+		/// </summary>
+		/// <value>Method to invoke.</value>
+		public Action Action { get; }
+	};
+
+	/// <summary>
+	/// A statusbar for your application.  
+	/// The statusbar should be context sensitive. This means, if the main menu and an open text editor are visible, the items probably shown will
+	/// be ~F1~ Help ~F2~ Save ~F3~ Load. While a dialog to ask a file to load is executed, the remaining commands will probably be ~F1~ Help. 
+	/// So for each context must be a new instance of a statusbar.  
+	/// </summary>
+	public class StatusBar : View
+	{
+		public StatusItem [] Items { get; set; }
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="T:Terminal.Gui.StatusBar"/> class with the specified set of statusbar items.
+		/// It will be drawn in the lowest column of the terminal.
+		/// </summary>
+		/// <param name="items">A list of statusbar items.</param>
+		public StatusBar(StatusItem [] items) : base()
+		{
+			X = 0;
+			Y = Application.Driver.Rows - 1; // TODO: using internals of Application
+			Width = Dim.Fill ();
+			Height = 1;
+			Items = items;
+			CanFocus = false;
+			ColorScheme = Colors.Menu;
+		}
+
+		Attribute ToggleScheme(Attribute scheme)
+		{
+			var result = scheme==ColorScheme.Normal ? ColorScheme.HotNormal : ColorScheme.Normal;
+			Driver.SetAttribute(result);
+			return result;
+		}
+
+		public override void Redraw(Rect region) {
+			if (Frame.Y != Driver.Rows - 1) {
+				Frame = new Rect (Frame.X, Driver.Rows - 1, Frame.Width, Frame.Height);
+				Y = Driver.Rows - 1;
+				SetNeedsDisplay ();
+			}
+
+			Move (0, 0);
+			Driver.SetAttribute (ColorScheme.Normal);
+			for (int i = 0; i < Frame.Width; i++)
+				Driver.AddRune (' ');
+
+			Move (1, 0);
+			var scheme = ColorScheme.Normal;
+			Driver.SetAttribute(scheme);
+			for(int i=0; i<Items.Length; i++) {
+				var title = Items[i].Title;
+				for(int n=0; n<title.Length; n++) {
+					if(title[n]=='~') {
+						scheme = ToggleScheme(scheme);
+						continue;
+					}
+					Driver.AddRune(title[n]);
+				}
+				Driver.AddRune (' ');
+			}
+		}
+
+		public override bool ProcessHotKey (KeyEvent kb)
+		{
+			foreach(var item in Items) {
+				if(kb.Key==item.Shortcut) {
+					if( item.Action!=null ) item.Action();
+					return true;
+				}
+			}
+			return false;
+		}
+	}
+}
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