« Converter » : différence entre les versions
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Aucun résumé des modifications |
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| Ligne 33 : | Ligne 33 : | ||
} | } | ||
} | } | ||
</kode> | |||
== Inverted convertion == | |||
<filebox fn='BooleanToVisibilityConverter.cs'> | |||
public sealed class BooleanToVisibilityConverter : IValueConverter | |||
{ | |||
public object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture) | |||
{ | |||
bool visibleFlag = false; | |||
if (value is bool b) | |||
{ | |||
visibleFlag = b; | |||
} | |||
else | |||
{ | |||
return DependencyProperty.UnsetValue; | |||
} | |||
if (parameter != null) | |||
{ | |||
if (Enum.TryParse(parameter.ToString(), true, out Parameters invert) && invert == Parameters.Inverted) | |||
{ | |||
visibleFlag = !visibleFlag; | |||
} | |||
} | |||
return visibleFlag ? Visibility.Visible : Visibility.Collapsed; | |||
} | |||
public object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) | |||
{ | |||
throw new NotSupportedException(); | |||
} | |||
private enum Parameters | |||
{ | |||
Normal, | |||
Inverted | |||
} | |||
</filebox> | |||
<kode lang='xaml'> | |||
<TextBlock Visibility="{Binding MyProperty, Converter={StaticResource BooleanToVisibilityConverter}, ConverterParameter=Inverted}" /> | |||
</kode> | </kode> | ||
Version du 15 avril 2020 à 16:07
ValueConverter
|
<UserControl xmlns:my="clr-namespace:CurrentNameSpace">
<UserControl.Resources>
<my:MyConverter x:Key="myConverter"/>
</UserControl.Resources>
<TextBlock Text="{Binding Path=., Converter={StaticResource ResourceKey=myConverter}}" />
|
|
namespace CurrentNameSpace
{
// L'attribut ValueConversion est optionel,
// il permet de spécifier le type d'entrée et le type de sortie
[ValueConversion(typeof(int), typeof(string))]
public class MyConverter : IValueConverter
{
public object Convert(object values, Type targetType, object parameter, CultureInfo culture)
{
var binding1Value = (int)values;
...
return ""; // un string
}
// Conversion inverse non-implémentée
public object ConvertBack(object value, Type targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
}
|
Inverted convertion
| BooleanToVisibilityConverter.cs |
public sealed class BooleanToVisibilityConverter : IValueConverter
{
public object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
bool visibleFlag = false;
if (value is bool b)
{
visibleFlag = b;
}
else
{
return DependencyProperty.UnsetValue;
}
if (parameter != null)
{
if (Enum.TryParse(parameter.ToString(), true, out Parameters invert) && invert == Parameters.Inverted)
{
visibleFlag = !visibleFlag;
}
}
return visibleFlag ? Visibility.Visible : Visibility.Collapsed;
}
public object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotSupportedException();
}
private enum Parameters
{
Normal,
Inverted
}
|
|
|
<TextBlock Visibility="{Binding MyProperty, Converter={StaticResource BooleanToVisibilityConverter}, ConverterParameter=Inverted}" />
|
MultiValueConverter
|
|
<UserControl xmlns:my="clr-namespace:CurrentNameSpace">
<UserControl.Resources>
<my:MyConverter x:Key="myConverter"/>
</UserControl.Resources>
<TextBlock.Text>
<MultiBinding Converter="{StaticResource ResourceKey=myConverter}">
<Binding ... />
<Binding ... />
</MultiBinding>
</TextBlock.Text>
|
|
|
namespace CurrentNameSpace
{
// L'attribut ValueConversion n'est pas utilisé ici car il n'est pas adapté
// au MultiValueConverter : il ne peut définir qu'un seul type d'entrée
public class MyConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
var binding1Value = (int)values[0];
var binding2Value = (string)values[1];
...
return ""; // un string
}
// Conversion inverse non-implémentée
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
}
|
