Changing states of checkbox with even trigger

Question

I have this CheckBox:

<CheckBox x:Name="checkNotAppointed" Grid.Column="1" Grid.Row="2" Content="Not Appointed" >
    <CheckBox.Style>
        <Style TargetType="{x:Type CheckBox}">
            <Setter Property="Margin" Value="2" />
            <Setter Property="IsEnabled" Value="True" />
            <Setter Property="IsChecked" Value="{Binding FilterForNotAppointed, UpdateSourceTrigger=PropertyChanged}" />
            <Style.Triggers>
                <MultiDataTrigger>
                    <MultiDataTrigger.Conditions>
                        <Condition Binding="{Binding IsChecked, ElementName=checkElder}" Value="True" />
                        <Condition Binding="{Binding IsChecked, ElementName=checkMinisterialServant}" Value="False" />
                    </MultiDataTrigger.Conditions>
                    <Setter Property="IsEnabled" Value="True" />
                </MultiDataTrigger>
                <MultiDataTrigger>
                    <MultiDataTrigger.Conditions>
                        <Condition Binding="{Binding IsChecked, ElementName=checkElder}" Value="False" />
                        <Condition Binding="{Binding IsChecked, ElementName=checkMinisterialServant}" Value="True" />
                    </MultiDataTrigger.Conditions>
                    <Setter Property="IsEnabled" Value="True" />
                </MultiDataTrigger>
                <MultiDataTrigger>
                    <MultiDataTrigger.Conditions>
                        <Condition Binding="{Binding IsChecked, ElementName=checkElder}" Value="False" />
                        <Condition Binding="{Binding IsChecked, ElementName=checkMinisterialServant}" Value="False" />
                    </MultiDataTrigger.Conditions>
                    <Setter Property="IsChecked" Value="True" />
                    <Setter Property="IsEnabled" Value="False" />
                </MultiDataTrigger>
            </Style.Triggers>
        </Style>
    </CheckBox.Style>
</CheckBox>

If I untick either checkElder or checkMinisterialServant it has no affect on checkNotAppointed. Correct.

If I then untick both of them, it checks the checkNotAppointed and disables. Correct.

If I then check one of the other two, it enables checkNotAppointed but always unchecks it. Why?

Maybe the answer is on FilterForNotAppointed. On your third scenario, what is the value of FilterForNotAppointed's IsChecked? — tgpdyk, Jun 29 '16 at 02:59
@tgpdyk It was ticked before so it should be true. But I don't know who to debug the XAML side of things. Where would the breakpoint go? — Andrew Truckle, Jun 29 '16 at 04:42

score 0 · Answer 1 · answered Jun 29 '16 at 05:26

There is a missing part (IsChecked) on your Setter's Binding, it should be:

  <Setter Property="IsChecked" Value="{Binding IsChecked, ElementName=FilterForNotAppointed}"/>

Based on your comment, the FilterForNotAppointed is another combo box, so you can check it by adding these:

<StackPanel Orientation="Horizontal">
        <Label Content="FilterForNotAppointed' IsChecked:"/>
        <TextBlock VerticalAlignment="Center" Text="{Binding IsChecked, ElementName=FilterForNotAppointed}"/>
 </StackPanel>

 <StackPanel Orientation="Horizontal">
        <Label Content="checkNotAppointed's IsChecked:"/>
        <TextBlock VerticalAlignment="Center" Text="{Binding IsChecked, ElementName=checkNotAppointed}"/>
 </StackPanel>

On my side, the concern on "always unchecks" issue does not exist. — tgpdyk, Jun 29 '16 at 06:19

Changing states of checkbox with even trigger

1 Answers1