Add support for checkboxes with mixed state

Samples/MainWindow.cs

@@ -48,6 +48,7 @@ namespace Samples
 			
 			AddSample (null, "Boxes", typeof(Boxes));
 			AddSample (null, "Buttons", typeof(ButtonSample));
+			AddSample (null, "CheckBox", typeof(Checkboxes));
 			AddSample (null, "ComboBox", typeof(ComboBoxes));
 //			AddSample (null, "Designer", typeof(Designer));
 			AddSample (null, "Drag & Drop", typeof(DragDrop));

Samples/Samples.csproj

@@ -65,6 +65,7 @@
     <Compile Include="Samples\Labels.cs" />
     <Compile Include="Samples\Colors.cs" />
     <Compile Include="Samples\Frames.cs" />
+    <Compile Include="Samples\Checkboxes.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>

Samples/Samples/Checkboxes.cs

@@ -0,0 +1,56 @@
+// 
+// Checkboxes.cs
+//  
+// Author:
+//       Lluis Sanchez <lluis@xamarin.com>
+// 
+// Copyright (c) 2012 Xamarin Inc
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+using Xwt;
+
+namespace Samples
+{
+	public class Checkboxes: VBox
+	{
+		public Checkboxes ()
+		{
+			PackStart (new CheckBox ("Normal checkbox"));
+			
+			var b = new CheckBox ("Allows mixed") { AllowMixed = true };
+			PackStart (b);
+			
+			int clicks = 0, toggles = 0;
+			Label la = new Label ();
+			PackStart (la);
+			
+			b.Clicked += delegate {
+				clicks++;
+				la.Text = string.Format ("active:{0}, mixed:{1}, clicks:{2}, toggles:{3}", b.Active, b.Mixed, clicks, toggles);
+			};
+			
+			b.Toggled += delegate {
+				toggles++;
+				la.Text = string.Format ("active:{0}, mixed:{1}, clicks:{2}, toggles:{3}", b.Active, b.Mixed, clicks, toggles);
+			};
+		}
+	}
+}
+

Xwt.Gtk/Xwt.GtkBackend/CheckBoxBackend.cs

@@ -31,6 +31,9 @@ namespace Xwt.GtkBackend
 {
 	public class CheckBoxBackend: WidgetBackend, ICheckBoxBackend
 	{
+		bool allowMixed;
+		bool internalActiveUpdate;
+		
 		public CheckBoxBackend ()
 		{
 		}
@@ -39,6 +42,7 @@ namespace Xwt.GtkBackend
 		{
 			Widget = new Gtk.CheckButton ();
 			Widget.Show ();
+			Widget.Clicked += HandleWidgetPreClicked;
 		}
 		
 		protected new Gtk.CheckButton Widget {
@@ -52,13 +56,27 @@ namespace Xwt.GtkBackend
 		
 		public bool Active {
 			get {
-				return Widget.Active;
+				return Widget.Active && !Widget.Inconsistent;
 			}
 			set {
 				Widget.Active = value;
 			}
 		}
 		
+		public bool AllowMixed {
+			get {
+				return allowMixed;
+			}
+			set {
+				allowMixed = value;
+			}
+		}
+		
+		public bool Mixed {
+			get { return Widget.Inconsistent; }
+			set { Widget.Inconsistent = value; }
+		}
+		
 		public void SetContent (string label)
 		{
 			Widget.Label = label;
@@ -102,8 +120,26 @@ namespace Xwt.GtkBackend
 			}
 		}
 
+		void HandleWidgetPreClicked (object sender, EventArgs e)
+		{
+			if (allowMixed) {
+				if (!Widget.Active) {
+					if (Widget.Inconsistent)
+						Widget.Inconsistent = false;
+					else {
+						Widget.Inconsistent = true;
+						internalActiveUpdate = true;
+						Widget.Active = true;
+						internalActiveUpdate = false;
+					}
+				}
+			}
+		}
+		
 		void HandleWidgetActivated (object sender, EventArgs e)
 		{
+			if (internalActiveUpdate)
+				return;
 			Toolkit.Invoke (delegate {
 				EventSink.OnToggled ();
 			});
@@ -111,6 +147,8 @@ namespace Xwt.GtkBackend
 
 		void HandleWidgetClicked (object sender, EventArgs e)
 		{
+			if (internalActiveUpdate)
+				return;
 			Toolkit.Invoke (delegate {
 				EventSink.OnClicked ();
 			});

Xwt/Xwt.Backends/ICheckBoxBackend.cs

@@ -32,6 +32,8 @@ namespace Xwt.Backends
 		void SetContent (IWidgetBackend widget);
 		void SetContent (string label);
 		bool Active { get; set; }
+		bool Mixed { get; set; }
+		bool AllowMixed { get; set; }
 	}
 	
 	public interface ICheckBoxEventSink: IWidgetEventSink

Xwt/Xwt.csproj

@@ -174,6 +174,7 @@
     <Compile Include="Xwt.Backends\IComboBoxEntryBackend.cs" />
     <Compile Include="Xwt.Engine\Toolkit.cs" />
     <Compile Include="Xwt\TreeViewStatus.cs" />
+    <Compile Include="Xwt\Clipboard.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>

Xwt/Xwt/CheckBox.cs

@@ -100,6 +100,18 @@ namespace Xwt
 			set { Backend.Active = value; }
 		}
 		
+		[DefaultValue (false)]
+		public bool Mixed {
+			get { return Backend.Mixed; }
+			set { Backend.Mixed = value; }
+		}
+		
+		[DefaultValue (false)]
+		public bool AllowMixed {
+			get { return Backend.AllowMixed; }
+			set { Backend.AllowMixed = value; }
+		}
+		
 		protected virtual void OnClicked (EventArgs e)
 		{
 			if (clicked != null)

Xwt/Xwt/Clipboard.cs

@@ -0,0 +1,37 @@
+// 
+// Clipboard.cs
+//  
+// Author:
+//       Lluis Sanchez <lluis@xamarin.com>
+// 
+// Copyright (c) 2012 Xamarin Inc
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+
+namespace Xwt
+{
+	public static class Clipboard
+	{
+		public static void Copy (TransferDataSource data)
+		{
+		}
+	}
+}
+