WPF COLORCONVERTER HOW TO

Public interface IMvxValueConverter įinally, ValueConverters can also be registered using a technique called “ValueConverter holders”.

a ConvertBack method - for changing View values into ViewModel values.

a Convert method - for changing ViewModel values into View values.

The IMvxValueConverter interface provides: ItemsControlMouseEventArgsConverterĬonverts MouseEventArgs to an item from the ItemsSource collection in data-bound controls.Value Converters in MvvmCross are used to provide mappings to/from logical values in the view models and presented values in the user interface.Ī Value Converter is any class which implements the IMvxValueConverter interface The DelegateConverterFactory class provides a set of static methods to create IValueConverter and IMutliValueConverter instances based on passed delegates.

Delegate Converter Factory (MultiValueConverter) If the input string is empty or null, the converter returns False otherwise, it returns True.īack conversion is not supported. If the input object is null, the converter returns False otherwise, it returns True.īack conversion is not supported. DefaultBooleanToBooleanConverterĬonverts between the three-state DefaultBoolean type ( Default, True and False) and the nullable Boolean type ( null, True, and False). Inverts the input Boolean or DefaultBoolean value.

WPF COLORCONVERTER HOW TO

HiddenInsteadOfCollapsed – if this property is True, the converter returns the Hidden state instead of the Collapsed state when the input value is 0.īelow is an example of how to use this converter.If the input value is 0, the converter returns Visibility.Collapsed otherwise, it returns Visibility.Visible. NumericToVisibilit圜onverterĬonverts numeric values to the Visibility type. If the input value is 0, the converter returns False otherwise, it returns True.īack conversion is not supported. HiddenInsteadOfCollapsed – if this property is True, the converter returns the Hidden state instead of the Collapsed state when the input value is Null or String.Empty.Ĭonverts numeric values to the Boolean type.Inverse – allows you to invert the conversion.Two additional properties are available in this converter. If the input value is Null or String.Empty, the converter returns Visibility.Collapsed otherwise, it returns Visibility.Visible. If it is necessary to use a custom culture, use the FormatStringConverter.Ĭonverts string values to the Visibility type. However, bindings always use the default culture for the language defined in XAML. The standard binding supports this feature via the StringFormat property. This converter formats a value according to a specific format string.

Assume that there is a View Model exposing a property of the ColorState enumeration type. See the following example that explains how to use the ObjectToObjectConverter. It is returned when the conversion fails.

DefaultSource – the property is used in a backward conversion.

DefaultTarget – this property contains an object, which should be returned in case of a failed conversion.

Map – this property contains a collection of MapItem objects that map input and output values.

ObjectToObjectConverter provides three properties. This converter acts as a dictionary, which maps predefined input values to output values of any type. These converters are useful when binding one property to another of an incompatible type (for instance, when binding a control’s Boolean property to a property of the Visibility type).Īll converters are in the namespace. The 22.1 library provides a set of extended value converters that help you perform conversions between different types and even between values of the same type.

Wpf colorconverter