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905
Managing mandatory fields with triggers
posted

I would like to set mandatory field backgrounds are red and others are green. So I try to implement below. But I could not control ValueConstraint Nullable property with trigger. Could you help please ?

<Window x:Class="TriggerGirilmesigerekenalanlar.Window1" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:y="http://infragistics.com/Editors" 
    Title="Window1" Height="300" Width="300"> 
    <Window.Resources> 
        <Style TargetType="{x:Type y:XamTextEditor}"> 
            <Style.Triggers> 
                <Trigger Property="ValueConstraint" Value="{x:Null}"> 
                    <Trigger.Setters> 
                        <Setter Property="Background" Value="green"></Setter> 
                    </Trigger.Setters> 
                </Trigger> 
                <Trigger Property="y:ValueConstraint.Nullable" Value="false"> 
                    <Trigger.Setters> 
                        <Setter Property="Background" Value="red"></Setter> 
                    </Trigger.Setters> 
                </Trigger> 
            </Style.Triggers> 
        </Style> 
    </Window.Resources> 
    <StackPanel> 
        <y:XamTextEditor> 
            <y:XamTextEditor.ValueConstraint> 
                <y:ValueConstraint Nullable="False" ></y:ValueConstraint> 
            </y:XamTextEditor.ValueConstraint> 
        </y:XamTextEditor> 
        <y:XamTextEditor></y:XamTextEditor> 
    </StackPanel> 
</Window> 
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  • 905
    posted


    I would like to set mandatory field backgrounds are red and others are green.
    So I try to implement below. But I could not control ValueConstraint Nullable property with trigger.
    Could you help please ?

    <Window x:Class="TriggerGirilmesigerekenalanlar.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            xmlns:y="http://infragistics.com/Editors"
        Title="Window1" Height="300" Width="300">
        <Window.Resources>
            <Style TargetType="{x:Type y:XamTextEditor}">
                <Style.Triggers>
                    <Trigger Property="ValueConstraint" Value="{x:Null}">
                        <Trigger.Setters>
                            <Setter Property="Background" Value="green"></Setter>
                        </Trigger.Setters>
                    </Trigger>
                    <Trigger Property="y:ValueConstraint.Nullable" Value="false">
                        <Trigger.Setters>
                            <Setter Property="Background" Value="red"></Setter>
                        </Trigger.Setters>
                    </Trigger>
                </Style.Triggers>
            </Style>
        </Window.Resources>
        <StackPanel>
            <y:XamTextEditor>
                <y:XamTextEditor.ValueConstraint>
                    <y:ValueConstraint Nullable="False" ></y:ValueConstraint>
                </y:XamTextEditor.ValueConstraint>
            </y:XamTextEditor>
            <y:XamTextEditor></y:XamTextEditor>
        </StackPanel>
    </Window>
     

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