I want to show a different icon/image depending on an enum value. For example, if I had the following enum:
public enum UploadStatus
{
Unknown = 0,
WaitingToUpload = 10,
Uploading = 20,
Uploaded = 30,
UploadFailed = 40
}
I'd like to write XAML that looks something like this:
...
<EnumImage Value="{Binding Path=CurrentStatus}">
<EnumImageItem Value="Unknown" Image="/images/unknown.png" />
<EnumImageItem Value="WaitingToUpload" Image="/images/clock.png" />
<EnumImageItem Value="Uploading" Image="/images/upload.png" />
<EnumImageItem Value="Uploaded" Image="/images/tick.png" />
<EnumImageItem Value="UploadFailed" Image="/images/error.png" />
</EnumImage>
...
I've found many posts suggesting custom IValueConverters, but those solutions don't fit the XAML paradigm.
Any pointers or suggestions?
Here is a Value converter which maintains the "XAML paradigm" that is the relationship between enum values and images is maintained in XAML.
[ContentProperty("Items")]
public class EnumToObjectConverter : IValueConverter
{
public ResourceDictionary Items { get; set; }
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
string key = Enum.GetName(value.GetType(), value);
return Items[key];
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException("This converter only works for one way binding");
}
}
Note that this is very generic it actually maps values of any enum type to any arbitary object. This is what its usage looks like in Xaml:-
<Grid.Resources>
<local:EnumToObjectConverter x:Key="Icons">
<ResourceDictionary>
<BitmapImage x:Key="Unknown" UriSource="/images/unknown.png" />
<BitmapImage x:Key="WaitingToUpload" UriSource="/images/clock.png" />
<BitmapImage x:Key="Uploading" UriSource="/images/upload.png" />
<BitmapImage x:Key="Uploaded" UriSource="/images/tick.png" />
<BitmapImage x:Key="UploadFailed" UriSource="/images/error.png" />
</ResourceDictionary>
</local:EnumToObjectConverter>
</Grid.Resources>
This converter can be used when binding property of the enum type:-
<Image Source="{Binding Status, Converter={StaticResource Icons}}" />
Your EnumImage
can be setup using Image
with DataTrigger
:
<Image Tag="{Binding Gender}" Width="48" Height="48">
<Image.Style>
<Style TargetType="Image">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=Tag, RelativeSource={RelativeSource Self}}" Value="Male">
<Setter Property="Source" Value="/Resources/Client_Male.png"/>
</DataTrigger>
<DataTrigger Binding="{Binding Path=Tag, RelativeSource={RelativeSource Self}}" Value="Female">
<Setter Property="Source" Value="/Resources/Client_Female.png"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Image.Style>
</Image>
Source: Displaying an image based on value in XAML
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