CODEWITHSUNDEEP
c#wpfdynamicuser-controls
cdie
cdie

Reputation: 4534

WPF Button dynamically added : events not firing

I've done a WPF base usercontrol for all my usercontrols to inherit of. In this base usercontrol class, I want to have a button associated to a click event. I've made it like this :

public class MBaseUserControl : UserControl
{
  //[...]
    protected override void OnContentChanged(object oldContent, object newContent)
    {
        base.OnContentChanged(oldContent, newContent);

        StackPanel mainPanel = new StackPanel();
        EditButton = new Button();
        EditButton.Height = EditButton.Width = 24;
        EditButton.MouseEnter += EditButton_MouseEnter;
        EditButton.MouseLeave += EditButton_MouseLeave;
        EditButton.Click += new RoutedEventHandler(EditButton_Click);
        EditButton.Background = Brushes.Transparent;
        EditButton.BorderBrush = Brushes.Transparent;
        EditButton.HorizontalAlignment = System.Windows.HorizontalAlignment.Right;
        EditButton.VerticalAlignment = System.Windows.VerticalAlignment.Top;

        StackPanel buttonPanel = new StackPanel();
        Image editButtonImage =     ImageTools.ConvertDrawingImageToWPFImage(Properties.Resources.edit, 24, 24);
        buttonPanel.Children.Add(editButtonImage);

        EditButton.Content = buttonPanel;

        mainPanel.Children.Add(EditButton);
        //Add this to new control
        ((IAddChild)newContent).AddChild(mainPanel);
        SetCMSMode(false);
    }
}

But when I click the button on GUI, nothing is firing (neither Mouse events or click event). What did I miss ?

Thanks by advance !

Upvotes: 1

Views: 756

Answers (2)

Sinatr
Sinatr

Reputation: 21979

You can try to template UserControl to have its Content shown inside some other content. Note, it's untested, but I think it should work.

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:l="clr-namespace:DemoUni">
    <ControlTemplate x:Key="SomeKey" TargetType="UserControl">
        <Grid x:Name="PART_Grid">
            <ContentPresenter x:Name="PART_Content" Content="{Binding}"/>
            <!-- ... some other content -->
        </Grid>
    </ControlTemplate>
</ResourceDictionary>

In constructor of UserControl

var dictionary = new ResourceDictionary();
// xaml containing control template
dictionary.Source = new Uri("/ProjectName;component/MyUserControlTemplate.xaml", UriKind.Relative);
Template = dictionary["SomeKey"] as ControlTemplate;

To access other content (Grid as example)

    private Grid _partGrid;
    private Grid PartGrid
    {
        get
        {
            if (_partGrid == null)
                _partGrid = (Grid)Template.FindName("PART_Grid", this);
            return _partGrid;
        }
    }

The little drawback is what you can not access PARTs in constructor, so that you have to use Loaded of UserControl to wire up events (subscribe to Loaded in constructor, subscribe to button events in Loaded).

Upvotes: 1

gjacobs
gjacobs

Reputation: 133

perhaps adding new MouseEventHandler to your code:

EditButton.MouseEnter += new MouseEventHandler(EditButton_MouseEnter);
EditButton.MouseLeave += new MouseEventHandler(EditButton_MouseLeave);

Upvotes: 0

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