Button

Core.cs

@@ -396,8 +396,10 @@ namespace Terminal {
         /// </summary>
         public void FocusFirst ()
         {
-            if (subviews == null)
+            if (subviews == null) {
+                SuperView.SetFocus (this);
                 return;
+            }
             
             foreach (var view in subviews) {
                 if (view.CanFocus) {

Terminal.csproj

@@ -41,6 +41,7 @@
     <Compile Include="demo.cs" />
     <Compile Include="Views\Label.cs" />
     <Compile Include="Views\TextField.cs" />
+    <Compile Include="Views\Button.cs" />
   </ItemGroup>
   <ItemGroup>
    <Reference Include="mono-curses.dll">

Views/Button.cs

@@ -0,0 +1,179 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Terminal {
+    /// <summary>
+    ///   Button view
+    /// </summary>
+    /// <remarks>
+    ///   Provides a button that can be clicked, or pressed with
+    ///   the enter key and processes hotkeys (the first uppercase
+    ///   letter in the button becomes the hotkey).
+    /// </remarks>
+    public class Button : View {
+        string text;
+        string shown_text;
+        char hot_key;
+        int hot_pos = -1;
+        bool is_default;
+
+        /// <summary>
+        ///   Clicked event, raised when the button is clicked.
+        /// </summary>
+        /// <remarks>
+        ///   Client code can hook up to this event, it is
+        ///   raised when the button is activated either with
+        ///   the mouse or the keyboard.
+        /// </remarks>
+        public event EventHandler Clicked;
+
+        /// <summary>
+        ///   Public constructor, creates a button based on
+        ///   the given text at position 0,0
+        /// </summary>
+        /// <remarks>
+        ///   The size of the button is computed based on the
+        ///   text length.   This button is not a default button.
+        /// </remarks>
+        public Button (string s) : this (0, 0, s) { }
+
+        /// <summary>
+        ///   Public constructor, creates a button based on
+        ///   the given text.
+        /// </summary>
+        /// <remarks>
+        ///   If the value for is_default is true, a special
+        ///   decoration is used, and the enter key on a
+        ///   dialog would implicitly activate this button.
+        /// </remarks>
+        public Button (string s, bool is_default) : this (0, 0, s, is_default) { }
+
+        /// <summary>
+        ///   Public constructor, creates a button based on
+        ///   the given text at the given position.
+        /// </summary>
+        /// <remarks>
+        ///   The size of the button is computed based on the
+        ///   text length.   This button is not a default button.
+        /// </remarks>
+        public Button (int x, int y, string s) : this (x, y, s, false) { }
+
+        /// <summary>
+        ///   The text displayed by this widget.
+        /// </summary>
+        public string Text {
+            get {
+                return text;
+            }
+
+            set {
+                text = value;
+                if (is_default)
+                    shown_text = "[< " + value + " >]";
+                else
+                    shown_text = "[ " + value + " ]";
+
+                hot_pos = -1;
+                hot_key = (char)0;
+                int i = 0;
+                foreach (char c in shown_text) {
+                    if (Char.IsUpper (c)) {
+                        hot_key = c;
+                        hot_pos = i;
+                        break;
+                    }
+                    i++;
+                }
+            }
+        }
+
+        /// <summary>
+        ///   Public constructor, creates a button based on
+        ///   the given text at the given position.
+        /// </summary>
+        /// <remarks>
+        ///   If the value for is_default is true, a special
+        ///   decoration is used, and the enter key on a
+        ///   dialog would implicitly activate this button.
+        /// </remarks>
+        public Button (int x, int y, string s, bool is_default)
+            : base (new Rect (x, y, s.Length + 4 + (is_default ? 2 : 0), 1))
+        {
+            CanFocus = true;
+
+            this.is_default = is_default;
+            Text = s;
+        }
+
+        public override void Redraw (Rect region)
+        {
+            Driver.SetAttribute (HasFocus ? Colors.Base.Focus : Colors.Base.Normal);
+            Move (0, 0);
+            Driver.AddStr (shown_text);
+
+            if (hot_pos != -1) {
+                Move (hot_pos, 0);
+                Driver.SetAttribute (HasFocus ? Colors.Base.HotFocus: Colors.Base.HotNormal);
+                Driver.AddCh (hot_key);
+            }
+        }
+
+        public override void PositionCursor ()
+        {
+            Move (hot_pos, 0);
+        }
+
+        bool CheckKey (KeyEvent key)
+        {
+            if (Char.ToUpper ((char)key.KeyValue) == hot_key) {
+                this.SetFocus (this);
+                if (Clicked != null)
+                    Clicked (this, EventArgs.Empty);
+                return true;
+            }
+            return false;
+        }
+
+        public override bool ProcessHotKey (KeyEvent kb)
+        {
+            if (kb.IsAlt)
+                return CheckKey (kb);
+
+            return false;
+        }
+
+        public override bool ProcessColdKey (KeyEvent kb)
+        {
+            if (is_default && kb.KeyValue == '\n') {
+                if (Clicked != null)
+                    Clicked (this, EventArgs.Empty);
+                return true;
+            }
+            return CheckKey (kb);
+        }
+
+        public override bool ProcessKey (KeyEvent kb)
+        {
+            var c = kb.KeyValue;
+            if (c == '\n' || c == ' ' || Char.ToUpper ((char)c) == hot_key) {
+                if (Clicked != null)
+                    Clicked (this, EventArgs.Empty);
+                return true;
+            }
+            return false;
+        }
+
+#if false
+        public override void ProcessMouse (Curses.MouseEvent ev)
+        {
+            if ((ev.ButtonState & Curses.Event.Button1Clicked) != 0) {
+                Container.SetFocus (this);
+                Container.Redraw ();
+                if (Clicked != null)
+                    Clicked (this, EventArgs.Empty);
+            }
+        }
+#endif
+    }
+}

demo.cs

@@ -11,7 +11,8 @@ class Demo {
             new Label (new Rect (0, 8, 40, 3), "3-Hello world, how are you doing today") { TextAlignment = TextAlignment.Centered },
             new Label (new Rect (0, 12, 40, 3), "4-Hello world, how are you doing today") { TextAlignment = TextAlignment.Justified},
             new Label (3, 14, "Login: "),
-            new TextField (10, 14, 40, "")
+            new TextField (10, 14, 40, ""),
+            new Button (3, 16, "Ok")
         };
         top.Add (win);
         Application.Run ();