Possible enhancement

[Mauro Sampietro]

Hi,
I understand this library is called CalBinding and so this may be out of scope but
it would be nice if bindings could parse complex c# expression so it could substitute some trivial converter class. Example:

public class OverlayVisibleConverter : BaseConverter, IMultiValueConverter
{
    public object Convert( object[] values, Type targetType, object parameter, CultureInfo culture )
    {
        bool isKeyboardFocusWithin = (bool)values[ 0 ];
        var passwordBox = (PasswordBox)values[2];

        bool visibile = !isKeyboardFocusWithin && String.IsNullOrEmpty( passwordBox.Password );
        return visibile ? Visibility.Visible : Visibility.Collapsed;
    }  
}


<Label.Visibility>
        <MultiBinding Converter="{StaticResource overlayLabelVisibilityConverter }">
                   <Binding ElementName="passwordBox" Path="IsKeyboardFocusWithin" />
                   <Binding ElementName="passwordBox" Path="SecurePassword" />
                   <Binding ElementName="passwordBox" />
        </MultiBinding>
</Label.Visibility>

Would be nice it it could become something like this, removing the converter class:

  <Label.Visibility>
            <MultiBinding Converter="**{calcBinding:Binding '!passwordBox.IsKeyboardFoucsWithin and passwordBox.SecurePassword'** }">
                  <Binding ElementName="passwordBox" Path="IsKeyboardFocusWithin" />
                  <Binding ElementName="passwordBox" Path="SecurePassword" />
                  <Binding ElementName="passwordBox" />
             </MultiBinding>
 </Label.Visibility>

This probably involve the management of ElementNames.
Do you think it is feasible? I can help out if this is considered helpful.

Thank you.

[Alex141]

Hi,

CalcBinding:Binding in most cases extends or repeats standart Binding behavior, so to solve your problem, you just need to use ElementName property like this:
<Label Visibility="{c:Binding Path='!IsKeyboardFocusWithin and SecurePassword' ElementName=passwordBox}"/>

That expression will be automaticaly converted into MultiBinding that you wrote higher
:)

[Mauro Sampietro]

Good! But what if i need to target multiple element names ?

Mauro Sampietro
Inviato da iPhone

Il giorno 27 lug 2016, alle ore 23:43, Alex141 [e-mail] ha scritto:

Hi,

CalcBinding:Binding in most cases extends or repeats standart Binding behavior, so to solve your problem, you just need to use ElementName property like this:
`

That expression will be automaticaly converted into MultiBinding that you wrote higher
:)

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[Alex141]

You know, this is not one task but this is a whole class of tasks - setting "Source" for each target property in binding instead of a whole binding expression. That class includes problems of setting "ElementName", "RelativeSource", "static classes" and others.
Calbinding was originally developed with one idea - simplest way for writing inline binding expressions. So, if you need more powerfull library, take a look at QuickConverter: https://quickconverter.codeplex.com/ . It allows you to write more powerful but less readable expressions :)

Good! But what if i need ti target multiple element names ?