WpfHelpers.cs

/* WpfHelpers.cs
 * part of Bovender framework
 * 
 * Copyright 2014-2018 Daniel Kraus
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace Bovender
{
    public static class WpfHelpers
    {
        #region Public methods

        public static 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));
        }
        
        #endregion

        #region Private methods

        static 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;
                }
            }
        }

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

        #endregion
    }
}