WPF ComboBox Hide (Disable) DropDown Programmatically Button

Question

I would like to know how to disable the ComboBox DropDown Button Programmatically function. I have seen many similar topics, but they all have a XAML solution.

By the way, if someone knows how to disable the entire ComboBox control design and leave only the element template visible, it can also be useful.

UPDATE

its my xaml definition

<ComboBox Name="lang_ComboBox" SelectionChanged="LanguageSelection_ComboBox_SelectionChanged"/>

And here is how I use it:

String text = "dorf";
BitmapImage image = new BitmapImage(new Uri("http://img88.imageshack.us/img88/4351/butchermi4.png"));
lang_ComboBox.Width = 100;
lang_ComboBox.Height = 30;
Grid sp;
for (int i = 0; i < 5; i++)
{
    ColumnDefinition gridCol1 = new ColumnDefinition();
    gridCol1.Width = new GridLength(30.0);
    ColumnDefinition gridCol2 = new ColumnDefinition();
    gridCol2.Width = new GridLength(70.0);
    sp = new Grid()
    {
        Width = 100,
        Height = 30
    };
    Image im = new Image()
    {
        Source = image,
        Width = 25,
        Height = 25
    };
    Label la = new Label() 
    { 
        Content = text
    };
    sp.ColumnDefinitions.Add(gridCol1);
    sp.ColumnDefinitions.Add(gridCol2);
    Grid.SetColumn(im, 0);
    Grid.SetColumn(la, 1);
    sp.Children.Add(la);
    sp.Children.Add(im);
    lang_ComboBox.Items.Add(sp);
}

UPDATE 2 Hmm, I get it, I'm using the wrong word. It must be a “Hide” management design and can still select from a list. I'm sorry. But I know how I can solve this with the Anatoly Nikolaev Code. To hide the control construct, I use:

ToggleButton dropDownButton = GetFirstChildOfType<ToggleButton>(lang_ComboBox);
dropDownButton.Visibility = System.Windows.Visibility.Collapsed;

, combobox dropdownmenu, , click .

, :).

Answer 1

ToggleButton in ComboBox, ComboBox, VisualTreeHelper, IsEnabled false, :

XAML

<Window x:Class="DisableComboBoxButton.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525"
    Loaded="Window_Loaded">

    <StackPanel>
        <ComboBox Name="comboBox"
                  Width="100" 
                  Height="25"
                  SelectedIndex="0">

            <ComboBoxItem>Test1</ComboBoxItem>
            <ComboBoxItem>Test2</ComboBoxItem>
            <ComboBoxItem>Test3</ComboBoxItem>
        </ComboBox>

        <ComboBox Name="AllComboBoxDisabled"
                  Width="100" 
                  Height="25"
                  IsEnabled="False"
                  SelectedIndex="0">

            <ComboBoxItem>Test1</ComboBoxItem>
            <ComboBoxItem>Test2</ComboBoxItem>
            <ComboBoxItem>Test3</ComboBoxItem>
        </ComboBox>
    </StackPanel>
</Window>

Code-behind

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        ToggleButton dropDownButton = GetFirstChildOfType<ToggleButton>(comboBox);

        dropDownButton.IsEnabled = false;
    }

    public static T GetFirstChildOfType<T>(DependencyObject dependencyObject) where T : DependencyObject
    {
        if (dependencyObject == null)
        {
            return null;
        }

        for (var i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject); i++)
        {
            var child = VisualTreeHelper.GetChild(dependencyObject, i);

            var result = (child as T) ?? GetFirstChildOfType<T>(child);

            if (result != null)
            {
                return result;
            }
        }

        return null;
    }
}

Output

Notes

GetFirstChildOfType() , , null. Window_Loaded, , .

Edit: another version

, , .

, ComboBox, , . ToggleButton , XAML.

, ComboBox, , .

Visibility:

public static class ButtonExt
{
    public static readonly DependencyProperty VisibilityProperty;

    public static void SetVisibility(DependencyObject DepObject, Visibility value)
    {
        DepObject.SetValue(VisibilityProperty, value);
    }

    public static Visibility GetVisibility(DependencyObject DepObject)
    {
        return (Visibility)DepObject.GetValue(VisibilityProperty);
    }

    static ButtonExt()
    {
        PropertyMetadata VisibiltyPropertyMetadata = new PropertyMetadata(Visibility.Collapsed);

        VisibilityProperty = DependencyProperty.RegisterAttached("Visibility",
                                                            typeof(Visibility),
                                                            typeof(ButtonExt),
                                                            VisibiltyPropertyMetadata);
    }
}

Setter ComboBox ( , . App.xaml):

<Setter Property="Template">
    <Setter.Value>
        <ControlTemplate TargetType="{x:Type ComboBox}">
            <Grid>
                <ToggleButton Name="ToggleButton" 
                              Template="{StaticResource ComboBoxToggleButton}" 
                              IsChecked="{Binding Path=IsDropDownOpen, 
                                                  Mode=TwoWay, 
                                                  RelativeSource={RelativeSource TemplatedParent}}" 
                              Visibility="{TemplateBinding PropertiesExtension:ButtonExt.Visibility}" // <------ Here
                              Grid.Column="2" 
                              Focusable="False"                        
                              ClickMode="Press" />

:

<ComboBox Name="comboBox"
          Style="{StaticResource ComboBoxBaseStyle}"
          PropertiesExtension:ButtonExt.Visibility="Visible"
          Width="100"
          Height="30"
          SelectedIndex="0">

    <ComboBoxItem>Test1</ComboBoxItem>
    <ComboBoxItem>Test2</ComboBoxItem>
    <ComboBoxItem>Test3</ComboBoxItem>
</ComboBox>

Click:

private void HideButton_Click(object sender, RoutedEventArgs e)
{ 
    ButtonExt.SetVisibility(comboBox, Visibility.Hidden);
}

private void ShowButton_Click(object sender, RoutedEventArgs e)
{
    ButtonExt.SetVisibility(comboBox, Visibility.Visible);
}    

.