From 08da454529a0f8c2f971cf2a64635c66920b8bfb Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Mon, 4 May 2015 16:52:07 +0200
Subject: [PATCH] Added a DeckPresenter.

Which displays only the active card.
---
 Perspex.Controls/Perspex.Controls.csproj      |   1 +
 Perspex.Controls/Presenters/DeckPresenter.cs  | 128 ++++++++++++++++++
 Perspex.Controls/Presenters/ItemsPresenter.cs |   9 +-
 Perspex.Diagnostics/DevTools.cs               |   2 +-
 Perspex.Themes.Default/DeckStyle.cs           |  17 +--
 5 files changed, 135 insertions(+), 22 deletions(-)
 create mode 100644 Perspex.Controls/Presenters/DeckPresenter.cs

diff --git a/Perspex.Controls/Perspex.Controls.csproj b/Perspex.Controls/Perspex.Controls.csproj
index a21f9cc112..3551d7aa15 100644
--- a/Perspex.Controls/Perspex.Controls.csproj
+++ b/Perspex.Controls/Perspex.Controls.csproj
@@ -48,6 +48,7 @@
     <Compile Include="Popup.cs" />
     <Compile Include="IDataTemplate.cs" />
     <Compile Include="Presenters\IPresenter.cs" />
+    <Compile Include="Presenters\DeckPresenter.cs" />
     <Compile Include="Primitives\AdornerDecorator.cs" />
     <Compile Include="Primitives\AdornerLayer.cs" />
     <Compile Include="RadioButton.cs" />
diff --git a/Perspex.Controls/Presenters/DeckPresenter.cs b/Perspex.Controls/Presenters/DeckPresenter.cs
new file mode 100644
index 0000000000..c3fbe01544
--- /dev/null
+++ b/Perspex.Controls/Presenters/DeckPresenter.cs
@@ -0,0 +1,128 @@
+// -----------------------------------------------------------------------
+// <copyright file="DeckPresenter.cs" company="Steven Kirk">
+// Copyright 2015 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls.Presenters
+{
+    using Perspex.Controls.Generators;
+    using Perspex.Controls.Primitives;
+    using Perspex.Input;
+    using Perspex.Styling;
+    using System;
+    using System.Collections;
+    using System.Collections.Specialized;
+    using System.Reactive.Linq;
+
+    public class DeckPresenter : Control, IVisual, IPresenter, ITemplatedControl
+    {
+        public static readonly PerspexProperty<IEnumerable> ItemsProperty =
+            ItemsControl.ItemsProperty.AddOwner<DeckPresenter>();
+
+        public static readonly PerspexProperty<ItemsPanelTemplate> ItemsPanelProperty =
+            ItemsControl.ItemsPanelProperty.AddOwner<DeckPresenter>();
+
+        public static readonly PerspexProperty<object> SelectedItemProperty =
+            SelectingItemsControl.SelectedItemProperty.AddOwner<DeckPresenter>();
+
+        private bool createdPanel;
+
+        public DeckPresenter()
+        {
+            this.GetObservableWithHistory(SelectedItemProperty).Subscribe(this.SelectedItemChanged);
+        }
+
+        public ItemContainerGenerator ItemContainerGenerator
+        {
+            get;
+            private set;
+        }
+
+        public IEnumerable Items
+        {
+            get { return this.GetValue(ItemsProperty); }
+            set { this.SetValue(ItemsProperty, value); }
+        }
+
+        public ItemsPanelTemplate ItemsPanel
+        {
+            get { return this.GetValue(ItemsPanelProperty); }
+            set { this.SetValue(ItemsPanelProperty, value); }
+        }
+
+        public object SelectedItem
+        {
+            get { return this.GetValue(SelectedItemProperty); }
+            set { this.SetValue(SelectedItemProperty, value); }
+        }
+
+        public Panel Panel
+        {
+            get;
+            private set;
+        }
+
+        public override sealed void ApplyTemplate()
+        {
+            if (!this.createdPanel)
+            {
+                this.CreatePanel();
+            }
+        }
+
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            this.Panel.Measure(availableSize);
+            return this.Panel.DesiredSize.Value;
+        }
+
+        protected override Size ArrangeOverride(Size finalSize)
+        {
+            this.Panel.Arrange(new Rect(finalSize));
+            return finalSize;
+        }
+
+        private void CreatePanel()
+        {
+            this.ClearVisualChildren();
+            this.Panel = this.ItemsPanel.Build();
+            this.Panel.TemplatedParent = this;
+            KeyboardNavigation.SetTabNavigation(this.Panel, KeyboardNavigationMode.Once);
+            ((IItemsPanel)this.Panel).ChildLogicalParent = this.TemplatedParent as ILogical;
+            this.AddVisualChild(this.Panel);
+            this.createdPanel = true;
+            this.SelectedItemChanged(Tuple.Create<object, object>(null, this.SelectedItem));
+        }
+
+        private IItemContainerGenerator GetGenerator()
+        {
+            if (this.ItemContainerGenerator == null)
+            {
+                ItemsControl i = this.TemplatedParent as ItemsControl;
+                this.ItemContainerGenerator = i?.ItemContainerGenerator ?? new ItemContainerGenerator(this);
+            }
+
+            return this.ItemContainerGenerator;
+        }
+
+        private void SelectedItemChanged(Tuple<object, object> value)
+        {
+            if (this.createdPanel)
+            {
+                var generator = this.GetGenerator();
+
+                if (value.Item1 != null)
+                {
+                    generator.RemoveAll();
+                    this.Panel.Children.Clear();
+                }
+
+                if (value.Item2 != null)
+                {
+                    this.Panel.Children.AddRange(generator.Generate(new[] { value.Item2 }));
+                }
+            }
+        }
+    }
+}
diff --git a/Perspex.Controls/Presenters/ItemsPresenter.cs b/Perspex.Controls/Presenters/ItemsPresenter.cs
index 7e09b5f8e5..2730546c96 100644
--- a/Perspex.Controls/Presenters/ItemsPresenter.cs
+++ b/Perspex.Controls/Presenters/ItemsPresenter.cs
@@ -6,14 +6,13 @@
 
 namespace Perspex.Controls.Presenters
 {
+    using Perspex.Controls.Generators;
+    using Perspex.Input;
+    using Perspex.Styling;
     using System;
     using System.Collections;
     using System.Collections.Specialized;
     using System.Reactive.Linq;
-    using Perspex.Controls.Generators;
-    using Perspex.Input;
-    using Perspex.Styling;
-    using Perspex.Controls.Templates;
 
     public class ItemsPresenter : Control, IVisual, IPresenter, ITemplatedControl
     {
@@ -25,8 +24,6 @@ namespace Perspex.Controls.Presenters
 
         private bool createdPanel;
 
-        private DataTemplate memberSelectorTemplate;
-
         public ItemsPresenter()
         {
             this.GetObservableWithHistory(ItemsProperty).Subscribe(this.ItemsChanged);
diff --git a/Perspex.Diagnostics/DevTools.cs b/Perspex.Diagnostics/DevTools.cs
index df76a45e54..4149b84ce2 100644
--- a/Perspex.Diagnostics/DevTools.cs
+++ b/Perspex.Diagnostics/DevTools.cs
@@ -152,7 +152,7 @@ namespace Perspex.Diagnostics
                             Children = new Controls
                             {
                                 new TextBlock { Text = x.Name },
-                                new TextBlock { [!TextBlock.TextProperty] = x.WhenAnyValue(v => v.Value).Select(v => v.ToString()) },
+                                new TextBlock { [!TextBlock.TextProperty] = x.WhenAnyValue(v => v.Value).Select(v => v?.ToString()) },
                                 new TextBlock { Text = x.Priority },
                             },
                         }),
diff --git a/Perspex.Themes.Default/DeckStyle.cs b/Perspex.Themes.Default/DeckStyle.cs
index 07494599e3..b932aeb72f 100644
--- a/Perspex.Themes.Default/DeckStyle.cs
+++ b/Perspex.Themes.Default/DeckStyle.cs
@@ -24,30 +24,17 @@ namespace Perspex.Themes.Default
                         new Setter(Deck.TemplateProperty, ControlTemplate.Create<Deck>(this.Template)),
                     },
                 },
-                new Style(x => x.OfType<Deck>().Descendent().Is<DeckItem>())
-                {
-                    Setters = new[]
-                    {
-                        new Setter(Control.IsVisibleProperty, false),
-                    },
-                },
-                new Style(x => x.OfType<Deck>().Descendent().Is<DeckItem>().Class(":selected"))
-                {
-                    Setters = new[]
-                    {
-                        new Setter(Control.IsVisibleProperty, true),
-                    },
-                }
             });
         }
 
         private Control Template(Deck control)
         {
-            return new ItemsPresenter
+            return new DeckPresenter
             {
                 Id = "itemsPresenter",
                 [~ItemsPresenter.ItemsProperty] = control[~Deck.ItemsProperty],
                 [~ItemsPresenter.ItemsPanelProperty] = control[~Deck.ItemsPanelProperty],
+                [~DeckPresenter.SelectedItemProperty] = control[~Deck.SelectedItemProperty],
             };
         }
     }