Make TextBoxes select all text on focus.

zaaReloaded2/ThisAddIn.cs

@@ -27,6 +27,10 @@ using Microsoft.Office.Tools.Word;
 using Bovender.Versioning;
 using Bovender.Mvvm.Messaging;
 using zaaReloaded2.ExceptionHandler;
+using System.Windows;
+using System.Windows.Input;
+using System.Windows.Controls;
+using System.Windows.Media;
 
 namespace zaaReloaded2
 {
@@ -48,6 +52,7 @@ namespace zaaReloaded2
         private void ThisAddIn_Startup(object sender, System.EventArgs e)
         {
             Bovender.ExceptionHandler.CentralHandler.ManageExceptionCallback += CentralHandler_ManageExceptionCallback;
+            RegisterTextBoxSelectAll();
             CheckForUpdates();
             _oldCaption = Globals.ThisAddIn.Application.Caption;
             Globals.ThisAddIn.Application.Caption = 
@@ -156,5 +161,43 @@ namespace zaaReloaded2
         }
         
         #endregion
+
+        void RegisterTextBoxSelectAll()
+        {
+            // Select the text in a TextBox when it receives focus.
+            EventManager.RegisterClassHandler(typeof(TextBox), TextBox.PreviewMouseLeftButtonDownEvent,
+                new MouseButtonEventHandler(SelectivelyIgnoreMouseButton));
+            EventManager.RegisterClassHandler(typeof(TextBox), TextBox.GotKeyboardFocusEvent,
+                new RoutedEventHandler(SelectAllText));
+            EventManager.RegisterClassHandler(typeof(TextBox), TextBox.MouseDoubleClickEvent,
+                new RoutedEventHandler(SelectAllText));
+        }
+
+        void SelectivelyIgnoreMouseButton(object sender, MouseButtonEventArgs e)
+        {
+            // Find the TextBox
+            DependencyObject parent = e.OriginalSource as UIElement;
+            while (parent != null && !(parent is TextBox))
+                parent = VisualTreeHelper.GetParent(parent);
+
+            if (parent != null)
+            {
+                var textBox = (TextBox)parent;
+                if (!textBox.IsKeyboardFocusWithin)
+                {
+                    // If the text box is not yet focused, give it the focus and
+                    // stop further processing of this click event.
+                    textBox.Focus();
+                    e.Handled = true;
+                }
+            }
+        }
+
+        void SelectAllText(object sender, RoutedEventArgs e)
+        {
+            var textBox = e.OriginalSource as TextBox;
+            if (textBox != null)
+                textBox.SelectAll();
+        }
     }
 }