.net copy

BrightSharp.NET/Behaviors/SelectAllTextOnFocusBehavior.cs

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+using Microsoft.Xaml.Behaviors;
+using System.Windows.Controls.Primitives;
+using System.Windows.Input;
+
+namespace BrightSharp.Behaviors
+{
+    public class SelectAllTextOnFocusBehavior : Behavior<TextBoxBase>
+    {
+        protected override void OnAttached() {
+            base.OnAttached();
+            AssociatedObject.GotKeyboardFocus += AssociatedObjectGotKeyboardFocus;
+            AssociatedObject.PreviewMouseLeftButtonDown += AssociatedObjectPreviewMouseLeftButtonDown;
+        }
+
+        protected override void OnDetaching() {
+            base.OnDetaching();
+            AssociatedObject.GotKeyboardFocus -= AssociatedObjectGotKeyboardFocus;
+            AssociatedObject.PreviewMouseLeftButtonDown -= AssociatedObjectPreviewMouseLeftButtonDown;
+        }
+
+        private void AssociatedObjectGotKeyboardFocus(object sender,
+            KeyboardFocusChangedEventArgs e) {
+            AssociatedObject.SelectAll();
+        }
+
+        private void AssociatedObjectPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) {
+            if (!AssociatedObject.IsKeyboardFocusWithin) {
+                AssociatedObject.Focus();
+                e.Handled = true;
+            }
+        }
+    }
+}