CODEWITHSUNDEEP
c#.netwpfdata-bindingframeworkelementfactory
ephracis
ephracis

Reputation: 11

Uri Binding for Image in FrameworkElementFactory

I am creating a DataTemplate in code and cannot use XAML. :(

I have managed to create an image inside the Template, but only if I hardcode the path to the ico file. I would love to be able to bind that string to the item (I am using the DataTemplate on a modified ListView).

Here's my code right now:

private DataTemplate CreateDataTemplate(string binding, HorizontalAlignment alignment, bool active, bool useIcon)
{
    DataTemplate dt = new DataTemplate();

    FrameworkElementFactory sp = new FrameworkElementFactory(typeof(StackPanel));
    sp.SetValue(StackPanel.OrientationProperty, Orientation.Horizontal);

    if (useIcon)
    {
        double size = 14.0;
        BitmapImage bmp = new BitmapImage(new Uri("MyIcon.ico", UriKind.RelativeOrAbsolute));

        FrameworkElementFactory icon = new FrameworkElementFactory(typeof(Image));
        icon.SetValue(Image.SourceProperty, bmp);
        icon.SetValue(Image.WidthProperty, size);
        icon.SetValue(Image.HeightProperty, size);
        icon.SetValue(Image.MarginProperty, new Thickness(0, 0, 5, 0));
        sp.AppendChild(icon);
    }

    FrameworkElementFactory tb = new FrameworkElementFactory(typeof(TextBlock));
    tb.SetBinding(TextBlock.TextProperty, new Binding(binding));
    tb.SetValue(TextBlock.ForegroundProperty, (active ? Brushes.Black : Brushes.Gray));
    tb.SetValue(TextBlock.TextTrimmingProperty, TextTrimming.CharacterEllipsis);
    tb.SetValue(TextBlock.HorizontalAlignmentProperty, alignment);
    sp.AppendChild(tb);

    dt.VisualTree = sp;
    return dt;
}

Thanks!

Upvotes: 1

Views: 4160

Answers (2)

user1412631
user1412631

Reputation: 31

An IValueConverter is the solution here. Mind the pack URI syntax though! In case the image is not part of your solution your Convert method should look like this:

public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
   return "pack://siteoforigin:,,,/" + (string)value;
}

Note that the image files need to be in the same directory as your applications binary, or a subdirectory thereof, since leading "../"s will be stripped away automatically.

Upvotes: 0

brunnerh
brunnerh

Reputation: 185300

I suppose a ValueConverter could work.

public class StringToBitmapImageConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        string uristring = value as string;
        return new BitmapImage(new Uri(uristring, UriKind.RelativeOrAbsolute));
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

icon.SetBinding(Image.SourceProperty, new Binding(path) { Converter = new StringToBitmapImageConverter() });

Where path is a property path which points towards the property holding an uri-string within the templated object.

Upvotes: 2

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