WPF自定义可双击进行编辑的文本块

思路如下

1. 模板中同时存在只显示文本的Textblock和编辑的TextBox；
2. 控件有显示和编辑两种状态，默认为显示状态，双击进入编辑状态；
3. 点击时记录状态，第二次点击时显示TextBox以实现进行编辑功能；

代码实现

XAML代码

• 先创建一个自定义控件，Template定义如下

<Style TargetType="{x:Type local:TextEditable}">
        "Template">
            
                "{x:Type local:TextEditable}">
                    "{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
                        
                            x:Name="PART_TextBlock"
                                       Background="Transparent"
                                       FontSize="{Binding FontSize, Mode=TwoWay, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:TextEditable}}"
                                       Text="{Binding Text, Mode=TwoWay, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:TextEditable}}" />
                            x:Name="PART_TextBox"
                                     Margin="-2,0,0,0"
                                     BorderThickness="0"
                                     Background="Transparent"
                                     Visibility="Collapsed"
                                     FontSize="{Binding FontSize, Mode=TwoWay, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:TextEditable}}"
                                     Text="{Binding Text, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:TextEditable}}" />
                        
                    
                
            
        
    Style>

C#代码

• 控件的C#代码如下

 [TemplatePart(Name = "PART_TextBlock", Type = typeof(TextEditable))]
    [TemplatePart(Name = "PART_TextBox", Type = typeof(TextEditable))]
    public class TextEditable : Control
    {
        public TextEditable()
        {
            MouseLeftButtonDown += TextEditable_MouseLeftButtonDown;
            LostFocus += TextEditable_LostFocus;
        }

        private void TextEditable_LostFocus(object sender, RoutedEventArgs e)
        {
            isSelected = false;
            Background = Brushes.Transparent;
            box.Visibility = Visibility.Collapsed;
            block.Visibility = Visibility.Visible;
        }

        bool isSelected = false;
        private void TextEditable_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (!isSelected)
            {
                isSelected = true;
                box.Focus();
            }
            else
            {
                box.Visibility = Visibility.Visible;
                block.Visibility = Visibility.Collapsed;
                box.Focus();
                box.SelectAll();
            }
        }

        static TextEditable()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(TextEditable), new FrameworkPropertyMetadata(typeof(TextEditable)));
        }

        public string Text
        {
            get { return (string)GetValue(TextProperty); }
            set { SetValue(TextProperty, value); }
        }

        // Using a DependencyProperty as the backing store for Text.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty TextProperty =
            DependencyProperty.Register("Text", typeof(string), typeof(TextEditable), new PropertyMetadata(string.Empty, OnTextChanged));

        private static void OnTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {

        }

        TextBlock block = null;
        TextBox box = null;
        public override void OnApplyTemplate()
        {
            block = GetTemplateChild("PART_TextBlock") as TextBlock;
            box = GetTemplateChild("PART_TextBox") as TextBox;
            block.LostFocus += TextEditable_LostFocus;
            box.LostFocus += TextEditable_LostFocus;
        }
    }

效果图