ZZ-EFEM/Framework/AitexSorterUI/Controls/Common/TextBoxBehavior.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

namespace Aitex.Sorter.UI.Controls.Common
{
	public class TextBoxBehavior
	{
		public static bool GetSelectAllTextOnFocus(TextBox textBox)
		{
			return (bool)textBox.GetValue(SelectAllTextOnFocusProperty);
		}

		public static void SetSelectAllTextOnFocus(TextBox textBox, bool value)
		{
			textBox.SetValue(SelectAllTextOnFocusProperty, value);
		}

		public static readonly DependencyProperty SelectAllTextOnFocusProperty =
			DependencyProperty.RegisterAttached(
				"SelectAllTextOnFocus",
				typeof(bool),
				typeof(TextBoxBehavior),
				new UIPropertyMetadata(false, OnSelectAllTextOnFocusChanged));

		private static void OnSelectAllTextOnFocusChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
		{
			var textBox = d as TextBox;
			if (textBox == null) return;

			if (e.NewValue is bool == false) return;

			if ((bool)e.NewValue)
			{
				textBox.GotFocus += SelectAll;
				textBox.PreviewMouseDown += IgnoreMouseButton;
			}
			else
			{
				textBox.GotFocus -= SelectAll;
				textBox.PreviewMouseDown -= IgnoreMouseButton;
			}
		}

		private static void SelectAll(object sender, RoutedEventArgs e)
		{
			var textBox = e.OriginalSource as TextBox;
			if (textBox == null) return;
			textBox.SelectAll();
		}

		private static void IgnoreMouseButton(object sender, System.Windows.Input.MouseButtonEventArgs e)
		{
			var textBox = sender as TextBox;
			if (textBox == null || (!textBox.IsReadOnly && textBox.IsKeyboardFocusWithin)) return;

			e.Handled = true;
			textBox.Focus();
		}
	}
}