CODEWITHSUNDEEP
.netwpftriggersmenuitemresourcedictionary
akjoshi
akjoshi

Reputation: 15772

MenuItem Trigger not working

I want to use a trigger to automatically hide a MenuItem which is disabled. If I use my style inside a particular MenuItem like this it works -

<MenuItem
    Command="{Binding RelativeSource={RelativeSource FindAncestor, 
                        AncestorType={x:Type ContextMenu}}, 
                        Path=PlacementTarget.DataContext.ExportCommand}"
    Header="Export...">
    <MenuItem.Style>
        <Style TargetType="{x:Type MenuItem}">
            <Style.Triggers>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="Visibility" Value="Collapsed" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </MenuItem.Style>
</MenuItem>

but if I place the same style in a ResourceDictionary like this, then it doesn't work -

<Style x:Key="{x:Type MenuItem}" TargetType="{x:Type MenuItem}" >
    <Style.Triggers>
        <Trigger Property="IsEnabled" Value="False">
            <Setter Property="Visibility" Value="Collapsed" />
        </Trigger>
    </Style.Triggers>
</Style>

I want to have this behavior for all my menu items and I don't want to put this style on every MenuItem inside my ContextMenu. Any Idea why it's not working?

Upvotes: 3

Views: 2655

Answers (2)

Nikolay
Nikolay

Reputation: 3828

Style is automatically applied to all instances of target types only if it does not have x:Key set (http://msdn.microsoft.com/en-us/library/ms745683.aspx). Is this your case?

Upvotes: 1

roberther
roberther

Reputation: 446

This seems to work. I have just tried it:

<Grid>
<Grid.Resources>
  <Style x:Key="{x:Type MenuItem}" TargetType="MenuItem" >
    <Setter Property="OverridesDefaultStyle" Value="False" />
    <Setter Property="TextBlock.Foreground" Value="Blue" />
    <Style.Triggers>
      <Trigger Property="IsEnabled" Value="False">
        <Setter Property="Visibility" Value="Collapsed" />
      </Trigger>
    </Style.Triggers>
  </Style>

</Grid.Resources>

<TextBox Text="Hello!" IsReadOnly="True">
  <TextBox.ContextMenu>
    <ContextMenu >
      <MenuItem Header="Item1" />
      <MenuItem Header="Item2" IsEnabled="False"/>
      <MenuItem Header="Item3" />
    </ContextMenu>
  </TextBox.ContextMenu>
</TextBox>
</Grid>

Upvotes: 1

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