CODEWITHSUNDEEP
c#wpf
Trent
Trent

Reputation: 1593

Unable to disable RecognizesAccessKey property for ComboBox dropdown

I'm working on a WPF window with a ComboBox and have come across the dreaded access key issue. Through my google-fu I've discovered that I can turn it off with the following code;

<Grid.Resources>
    <Style TargetType="{x:Type ContentPresenter}">
        <Setter Property="RecognizesAccessKey" Value="False"/>
    </Style>
</Grid.Resources>

This works relatively well, when an item is selected, it now shows the underscores and I don't need to worry about any .Replace(...) calls in the code behind. The problem is that it only works for the selected item, all the other items have the underscore hidden.

In the below picture, I selected AU-15003\SQLEXPRESS_2014 (originally the underscore was hidden), the underscore was shown when the dropdown closed. Then I re-opened the dropdown and the underscore stayed for that item. The other items still have no underscore (SQLEXPRESS2008 follows the same pattern).

I'm not sure why this is, I can't seem to find any other places where I could turn the RecognizesAccessKey property off.

enter image description here

Upvotes: 0

Views: 1664

Answers (1)

Grx70
Grx70

Reputation: 10349

I'm not sure what you're trying to accomplish here, but I can surely tell you why implicit styles targeting ContentPresenter tend not to work as expected.

The rule is that templates (ControlTemplates as well as DataTemplates) are boundaries for applying implicit styles, i.e. implicit style defined outside of the template will not be applied to elements inside one. There's one exception to that rule - if the targeted type derives from Control, the style will be applied even inside the templates. And you can easily check that ContentPresenter does not derive from Control. Moreover, the ContentPresenter in question (the one displaying the item in the ComboBox drop-down) is "located" in ComboBoxItem's template.

Now I cannot make out anything specific enough to reproduce your issue from the code you've posted, but I can advise you on how to tweak the ContentPresenter in the ComboBox drop-down - your best bet is to supply custom ComboBox.ItemTemplate:

<ComboBox (...)>
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <ContentPresenter Content="{Binding}" RecognizesAccessKey="False" />
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

If you'd like more general solution (one that resembles your attempt), you could create an implicit style targeting ComboBox and setting ComboBox.ItemTemplate property in a similar manner:

<Grid.Resources>
    <Style TargetType="{x:Type ComboBox}">
        <Setter Property="ItemTemplate">
            <Setter.Value>
                <DataTemplate>
                    <ContentPresenter Content="{Binding}" RecognizesAccessKey="False" />
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Grid.Resources>

Upvotes: 1

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