当两个扩展器都被选中时启用gridsplitter

Question

I have a grid with three rows.

First and last rows are occupied by expander and the second row is occupied by gridsplitter.

I want to accomplish a functionality to gridsplitter. I want the gridsplitter to be visible only when both my expander is unfolded Visibility ="visible" .

How can I set this behavior to the gridsplitter?

Answer 1

How about MultiDataTrigger

Here is the sample for your scenario.

<StackPanel>
    <Expander IsExpanded="True" x:Name="exp1">
        <TextBlock Text="In Expander 1" />
    </Expander>
    <Expander IsExpanded="True" x:Name="exp2">
       <TextBlock Text="In Expander 2" />   
    </Expander>    
    <GridSplitter >
        <GridSplitter.Style>
            <Style TargetType="GridSplitter">
                <Setter Property="Visibility" Value="Collapsed"/>
                <Style.Triggers>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding ElementName=exp1,  Path=IsExpanded}" Value="True" />
                            <Condition Binding="{Binding ElementName=exp2,  Path=IsExpanded}" Value="True" />
                        </MultiDataTrigger.Conditions>
                        <Setter Property="Visibility" Value="Visible" />

                    </MultiDataTrigger>
                </Style.Triggers>

            </Style>
        </TextBlock.Style>
    </GridSplitter>
</StackPanel>

Hope that helps