Question

I have a user control that has a text box and a button.

I want to disable the text box using trigger ( I know how to do this via code)

The XAML is as follow:

<UserControl x:Class="MyProject.UserControl1"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:l="clr-namespace:MyProject"
         mc:Ignorable="d"
         d:DesignHeight="300" d:DesignWidth="300">
    <UserControl.Resources>
        <Style TargetType="l:UserControl1" >
            <Style.Triggers>
    <Trigger Property="l:UserControl1.IsEditing" Value="True">
        <Setter  Property="IsEnabled" Value="False"></Setter>
        </Trigger>
     </Style.Triggers>
</Style>
   </UserControl.Resources>
   <Grid>
<Grid.RowDefinitions>
    <RowDefinition />
    <RowDefinition />
</Grid.RowDefinitions>
    <Button Content="Button" HorizontalAlignment="Left" x:Name="button1" VerticalAlignment="Top" Width="75" Grid.Row="0" Click="button1_Click" />
    <TextBox Height="23" HorizontalAlignment="Left" x:Name="textBox1" VerticalAlignment="Top" Width="120" Grid.Row="1"/>
</Grid>
</UserControl>

The code is:

using System;
using System.Windows;
using System.Windows.Controls;

    namespace MyProject
    {
    /// <summary>
    /// Interaction logic for UserControl1.xaml
    /// </summary>
    public partial class UserControl1 : UserControl
   {
        public static readonly DependencyProperty IsEditingProperty = DependencyProperty.Register(
                "IsEditing", typeof(Boolean), typeof(UserControl), new PropertyMetadata(false));

        public Boolean IsEditing
        {
            get { return (Boolean)GetValue(IsEditingProperty); }
            set { SetValue(IsEditingProperty, value); }
        }

        public UserControl1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            IsEditing = !IsEditing;
        }
       }
}

But this setup disable both TextBox and button. How can I only disable the button? If I have several Textbox and I want only some of them are disabled, what is the best option? If I have several different UIElements (such as textbox, calandar, datagrid and .. and I want to disable all of them using one triger, what should I do?

Answer 1

Try moving the style down to your grid, and set the TargetName to textBox1. See the answer to this question for an example: Triggers Based on Properties from DataContext

Btw, you should be able to bind the value of IsEditing directly to textBox1.IsEnabled (warning: coding in-place, so code may not work as-is)

<Button IsEnabled="{Binding Path=IsEditing RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl1}}} />