This is a simple UI toolkit for .NET.

It is an updated version of gui.cs that I wrote for mono-curses.

The toolkit contains various controls (labesl, text entry, buttons, radio buttons, checkboxes, dialog boxes, windows, menus) for building text user interfaces, a main loop, is designed to work on Curses and the Windows Console, works well on both color and monochrome terminals and has mouse support on terminal emulators that support it.

Go to the API documentation for details.

using Terminal.Gui;

class Demo {
    static void Main ()
    {
        Application.Init ();
        var top = Application.Top;

	// Creates the top-level window to show
        var win = new Window (new Rect (0, 1, top.Frame.Width, top.Frame.Height-1), "MyApp");
        top.Add (win);

	// Creates a menubar, the item "New" has a help menu.
        var menu = new MenuBar (new MenuBarItem [] {
            new MenuBarItem ("_File", new MenuItem [] {
                new MenuItem ("_New", "Creates new file", NewFile),
                new MenuItem ("_Close", "", () => Close ()),
                new MenuItem ("_Quit", "", () => { if (Quit ()) top.Running = false; })
            }),
            new MenuBarItem ("_Edit", new MenuItem [] {
                new MenuItem ("_Copy", "", null),
                new MenuItem ("C_ut", "", null),
                new MenuItem ("_Paste", "", null)
            })
        });
        top.Add (menu);

	// Add some controls
	win.Add (
            new Label (3, 2, "Login: "),
            new TextField (14, 2, 40, ""),
            new Label (3, 4, "Password: "),
            new TextField (14, 4, 40, "") { Secret = true },
            new CheckBox (3, 6, "Remember me"),
            new RadioGroup (3, 8, new [] { "_Personal", "_Company" }),
            new Button (3, 14, "Ok"),
            new Button (10, 14, "Cancel"),
            new Label (3, 18, "Press ESC and 9 to activate the menubar"));

        Application.Run ();
    }
}

This shows a UI like this:

Open the solution and run the sample program.

The input handling of gui.cs is similar in some ways to Emacs and the Midnight Commander, so you can expect some of the special key combinations to be active.

The key ESC can act as an Alt modifier (or Meta in Emacs parlance), to allow input on terminals that do not have an alt key. So to produce the sequence Alt-F, you can press either Alt-F, or ESC folowed by the key F.

To enter the key ESC, you can either press ESC and wait 100 milliseconds, or you can press ESC twice.

ESC-0, and ESC_1 through ESC-9 have a special meaning, they map to F10, and F1 to F9 respectively.

Currently gui.cs is built on top of curses, but the console driver has been abstracted, an implementation that uses System.Console is possible, but would have to emulate some of the behavior of curses, namely that operations are performed on the buffer, and the Refresh call reflects the contents of an internal buffer into the screen and position the cursor in the last set position at the end.

There are some tasks in the github issues, and some others are being tracked in the TODO.md file.

The original gui.cs was a UI toolkit in a single file and tied to curses. This version tries to be console-agnostic (but currently only has a curses backend, go figure) and instead of having a container/widget model, only uses Views (which can contain subviews) and changes the rendering model to rely on damage regions instead of burderning each view with the details.