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<ItemsControl Name="workingCardsPanel">
    <ItemsControl.Triggers>
        <Trigger SourceName="workingCardsPanel" Property="HasItems" Value="True">
            <Setter TargetName="workingCardsPanel" Property="BorderThickness" Value="1"/>
            <Setter TargetName="workingCardsPanel" Property="BorderBrush" Value="#FF828790"/>
        </Trigger>
    </ItemsControl.Triggers>
    <ItemsControl.Style>
        <Style TargetType="ItemsControl">
            <Style.Triggers>
            </Style.Triggers>
        </Style>
    </ItemsControl.Style>
    <ItemsControl.Items>
        <ListBoxItem><TextBlock Text="Hello world!"/></ListBoxItem>
    </ItemsControl.Items>
</ItemsControl>

When the ItemsControl has items, I want to set its BorderThickness and BorderBrush to corresponding values as demonstrated above.

However the code is not compilable.

I have already managed it when I move the setters to Style.Triggers. I just want to know whether ItemsControl.Triggers can do it. Or if it cannot, what does ItemsControl.Triggers used for?

One more question.

<ItemsControl>
    <ItemsControl.Triggers>
        <Trigger Property="HasItems" Value="True">
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="BorderBrush" Value="#FF828790"/>
        </Trigger>
    </ItemsControl.Triggers>

I'm wonder if it is possible that all properties(HasItems, BorderThickness, and BorderBrush) refer to ones of the control without its name. (as the ItemsControl does not have a name now.)

Thank you.

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1 に答える 1

0

I may answer my own question.

After searching a lot, to my surprise, MSDN explains the usage of FrameworkElement.Triggers.

In a word, only EventTrigger can be added to FrameworkElement.Triggers.

于 2012-07-04T04:33:59.750 に答える