wpf - 如何引用 MaxWidth="??" TextBlock 到所有者实际宽度？

Question

如何引用stpMessage？MaxWidth="??"_TextBlock ActualWidth

<StackPanel Name="stpMessage" Orientation="Horizontal"  Margin="0,5,0,0">
                    <Grid >
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="2*" />
                            <ColumnDefinition Width="2*" />
                        </Grid.ColumnDefinitions>
                        <TextBlock Margin="0,0,0,0" Foreground="Blue" TextWrapping="Wrap">@ToUserName</TextBlock>
                        <StackPanel Grid.Column="1">
                            <TextBlock Margin="5,0,0,0" Text="{Binding Path=Text}" MinHeight="20"  MinWidth="200"  HorizontalAlignment="Stretch" MaxWidth="1000"
                                       VerticalAlignment="Stretch" TextWrapping="WrapWithOverflow">START skf skdjf skdj hfskdjf ksdjhf ksjdhf ksjhf kjsf kjshf kjshkjfhsdf kjsfdkj hskdfj hskdjf hskdjf skjhfksjfks END</TextBlock>
                        </StackPanel>    
                    </Grid>
                </StackPanel>

Answer 1

这样做的问题是StackPanels不要限制孩子的大小，所以会随着孩子的需要成长

将您的控件更改StackPanel为限制其子项大小的控件，例如 a Grid（或将其包装在另一个控件中），然后使用ElementName绑定绑定到该ActualWidth控件的属性

<Grid Name="stpMessage" ... />
    ...
    <TextBlock MaxWidth="{Binding ElementName=stpMessage, Path=ActualWidth}" ... />
    ...
</Grid>