C# WPF - ScrollViewer + TextBlock troubles

问题

I have a TextBlock within a ScrollViewer that aligns with stretch to its window. I need the TextBlock to behave as the following:

Resizes with window, no scrollbars
When resized below a certain width the TextBlock needs to keep a MinWidth and scrollbars should appear
TextWrapping or TextTrimming should work appropriately

How can I get this functionality?

I have tried several ways, involving bindings to ActualWidth & ActualHeight, but can't get it to work.

This can't be that difficult, what am I missing?

Here is a code sample to put in XamlPad (no MinWidth is set yet):

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
            <TextBlock TextWrapping="Wrap" Text="Some really long text that should probably wordwrap when you resize the window." />
    </ScrollViewer>
</Window>

回答1:

This works:

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <ScrollViewer HorizontalScrollBarVisibility="Auto" 
                  VerticalScrollBarVisibility="Auto"
                  Name="Scroller">
        <TextBlock HorizontalAlignment="Stretch"
                   VerticalAlignment="Stretch"
                   MinWidth="100"
                   Width="{Binding ElementName=Scroller, Path=ViewportWidth}"
                   TextWrapping="Wrap"
                   Text="Some really long text that should probably wordwrap when you resize the window." />
    </ScrollViewer>
</Window>

回答2:

Without more detail, the best I can do is provide the standard way of doing this. Basically, host your element (which has a minimum size) in a scroll viewer; when the scrollviewer is resized small enough such that the element cannot wholly fit inside it, it will automatically display scroll bars. Example:

<ScrollViewer>
    <Button MinWidth="100" MinHeight="50"/>
</ScrollViewer>

回答3:

If you have more complicated layout and cannot bind to the ScrollViewer then the IgnoreWidthControl in the answer https://stackoverflow.com/a/41281041/254109 may help.

来源：https://stackoverflow.com/questions/1981137/c-sharp-wpf-scrollviewer-textblock-troubles

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