CODEWITHSUNDEEP
c#xamluwpwin-universal-app
Seaky Lone
Seaky Lone

Reputation: 1059

UWP Inherit from Control

For example I have a UserControl like this:

<UserControl x:Class="SMPlayer.ScrollingTextBlock">
    <ScrollViewer
        x:Name="TextScrollViewer"
        HorizontalScrollBarVisibility="Hidden"
        PointerEntered="TextScrollViewer_PointerEntered"
        VerticalScrollBarVisibility="Disabled">
        <StackPanel>
            <TextBlock x:Name="NormalTextBlock" />
            <TextBlock x:Name="PointerOverTextBlock" Visibility="Collapsed" />
        </StackPanel>
    </ScrollViewer>
</UserControl>

I want this UserControl still to be treated as a normal TextBlock. For example <ScrollingTextBlock Text="Something"/>. It is just a TextBlock with more functionalities, or in other words, another control that inherits from TextBlock. Because there are a lot of properties, I don't want to do this manually by adding DependencyProperty and do things like public string Text { get; set; }. It is just too much work.

How can I achieve that? I think this question might have been asked but I am not sure how to properly paraphrase it.

Upvotes: 1

Views: 387

Answers (2)

Corentin Pane
Corentin Pane

Reputation: 4943

If you want your control to "be treated as a normal TextBlock", then you don't have any other choice than inheriting from TextBlock. This is what inheritance is for.

Otherwise you indeed have to add properties to your UserControl and bind them by yourself, even though this is a lot of work this is due to the poor flexibility of the UserControl. You cannot have a Text property on an object unless it inherits from a TextBlock or you add it yourself.

Alternatively you can use templating to re-template a ContentControl like this:

public class ScrollingContent : ContentControl { }

<Window.Resources>
    <Style TargetType="local:ScrollingContent">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="local:ScrollingContent">
                    <ScrollViewer
                        x:Name="TextScrollViewer"
                        HorizontalScrollBarVisibility="Hidden"
                        VerticalScrollBarVisibility="Disabled">
                        <StackPanel>
                            <TextBlock x:Name="NormalTextBlock" />
                            <ContentPresenter></ContentPresenter>
                        </StackPanel>
                    </ScrollViewer>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>
<Grid>
    <local:ScrollingContent>
        <TextBlock Text="Whatever control I want" Foreground="Red"></TextBlock>
    </local:ScrollingContent>
</Grid>

But then again, your control is not really a TextBlock.

Upvotes: 1

Faywang - MSFT
Faywang - MSFT

Reputation: 5868

If you want to implement <ScrollingTextBlock Text="Something"/> in UserControl, you still need to add DependencyProperty to achieve it.

Upvotes: 1

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