From c39af6c1907c042f4a5a68e2c97cc0d8a8192d42 Mon Sep 17 00:00:00 2001
From: Robin <robinperris@gmail.com>
Date: Sat, 5 Dec 2015 14:16:37 +0000
Subject: [PATCH] DockPanel now tracks active content

---
 DarkUI/Docking/DarkDockContent.cs | 19 +++++++++++++++----
 DarkUI/Docking/DarkDockPanel.cs   | 25 +++++++++++++++++++++++++
 DarkUI/Docking/DarkToolWindow.cs  | 20 +++++++++++++++++---
 3 files changed, 57 insertions(+), 7 deletions(-)

diff --git a/DarkUI/Docking/DarkDockContent.cs b/DarkUI/Docking/DarkDockContent.cs
index 351ec4f..5f1adcf 100644
--- a/DarkUI/Docking/DarkDockContent.cs
+++ b/DarkUI/Docking/DarkDockContent.cs
@@ -1,4 +1,5 @@
 using DarkUI.Config;
+using System;
 using System.ComponentModel;
 using System.Drawing;
 using System.Windows.Forms;
@@ -59,10 +60,6 @@ namespace DarkUI.Docking
         [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         public DarkDockGroup DockGroup { get; internal set; }
 
-        [Browsable(false)]
-        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
-        public bool IsActive { get; internal set; }
-
         #endregion
 
         #region Constructor Region
@@ -81,5 +78,19 @@ namespace DarkUI.Docking
         }
 
         #endregion
+
+        #region Event Handler Region
+
+        protected override void OnEnter(EventArgs e)
+        {
+            base.OnEnter(e);
+
+            if (DockPanel == null)
+                return;
+
+            DockPanel.ActiveContent = this;
+        }
+
+        #endregion
     }
 }
diff --git a/DarkUI/Docking/DarkDockPanel.cs b/DarkUI/Docking/DarkDockPanel.cs
index 66e6ae5..4160818 100644
--- a/DarkUI/Docking/DarkDockPanel.cs
+++ b/DarkUI/Docking/DarkDockPanel.cs
@@ -13,10 +13,35 @@ namespace DarkUI.Docking
         private List<DarkDockContent> _contents;
         private Dictionary<DarkDockArea, DarkDockRegion> _regions;
 
+        private DarkDockContent _activeContent;
+
         #endregion
 
         #region Property Region
 
+        public DarkDockContent ActiveContent
+        {
+            get { return _activeContent; }
+            internal set
+            {
+                _activeContent = value;
+
+                ActiveGroup = _activeContent.DockGroup;
+                ActiveRegion = ActiveGroup.DockRegion;
+
+                foreach (var content in _contents)
+                    content.Invalidate();
+            }
+        }
+
+        [Browsable(false)]
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
+        public DarkDockRegion ActiveRegion { get; internal set; }
+
+        [Browsable(false)]
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
+        public DarkDockGroup ActiveGroup { get; internal set; }
+
         [Browsable(false)]
         [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
         public IMessageFilter MessageFilter { get; private set; }
diff --git a/DarkUI/Docking/DarkToolWindow.cs b/DarkUI/Docking/DarkToolWindow.cs
index ab07471..280ac3b 100644
--- a/DarkUI/Docking/DarkToolWindow.cs
+++ b/DarkUI/Docking/DarkToolWindow.cs
@@ -33,6 +33,18 @@ namespace DarkUI.Docking
 
         #endregion
 
+        #region Method Region
+
+        private bool IsActive()
+        {
+            if (DockPanel == null)
+                return false;
+
+            return DockPanel.ActiveContent == this;
+        }
+
+        #endregion
+
         #region Paint Region
 
         protected override void OnPaint(PaintEventArgs e)
@@ -45,10 +57,12 @@ namespace DarkUI.Docking
                 g.FillRectangle(b, ClientRectangle);
             }
 
+            var isActive = IsActive();
+
             // Draw header
-            var bgColor = IsActive ? Colors.BlueBackground : Colors.HeaderBackground;
-            var darkColor = IsActive ? Colors.DarkBlueBorder : Colors.DarkBorder;
-            var lightColor = IsActive ? Colors.LightBlueBorder : Colors.LightBorder;
+            var bgColor = isActive ? Colors.BlueBackground : Colors.HeaderBackground;
+            var darkColor = isActive ? Colors.DarkBlueBorder : Colors.DarkBorder;
+            var lightColor = isActive ? Colors.LightBlueBorder : Colors.LightBorder;
 
             using (var b = new SolidBrush(bgColor))
             {