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Step:I put a WrapPanel into the ScrollViewer. There is a button 1 in the window. Click button 1 and add a Button to the WrapPanel. When the number of Buttons in the WrapPanel exceeds the boundary of the WrapPanel, a vertical scroll bar will appear.

My question:I encountered a problem with a vertical scroll bar: when the vertical scroll bar appeared, the WrapPanel (or ScrollViewer?) changed to increase the width of a scroll bar (equivalent to a scroll bar outside). This problem will Causes the layout of other nearby controls to change. How can I fix it?

Window XAML:
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Border x:Name="Boder1" BorderThickness="1" BorderBrush="Black" Margin="0,0,368,0">
            <ScrollViewer x:Name="scrList" VerticalScrollBarVisibility="Auto" Margin="0,0,-2,-2">
                <WrapPanel x:Name="wplContent" Width="{Binding Width, ElementName=scrList, Mode=OneWay}">
                    <Button x:Name="CreateButton" Content="Button" Height="50" Width="50" Click="CreateButton_Click"/>

                </WrapPanel>
            </ScrollViewer>
        </Border>
        <Label Content="-Ranging" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="397,0,0,0"/>


    </Grid>
</Window>

CS:
private void CreateButton_Click(object sender, RoutedEventArgs e)
       {
           Button CButton = new Button();
           CButton.Width = 50;
           CButton.Height = 50;
           CButton.Content = "Button";
           wplContent.Children.Add(CButton);
       }

Click CreateButton under 65. When the number of button rows exceeds WrapPanel, you will find that the button moves to the left due to the appearance of the scroll bar. This is my problem.
Picture1:
https://i.loli.net/2021/09/10/YbZFWnst2V4ofGM.png[^]
Picture2:
https://i.loli.net/2021/09/10/DyxTAsaXVUCr19c.png[^]

What I have tried:

I found an example:
Give a WPF Grid the width of a ScrollViewer minus the scrollbar - Stack Overflow[^]
But it has nothing to do with my problem.
Posted
Updated 10-Sep-21 4:22am
v4
Comments
Richard Deeming 9-Sep-21 4:05am
   
There's a secret error somewhere in your secret code. You should fix that.

Seriously, how do you expect anyone to help you fix your code when we can't see your code, and all we have by way of example is a link to a question that is "nothing to do with" your problem?

Click the green "Improve question" link and update your question to include the relevant parts of your code, and a clear description of the problem.
tianlong wang 9-Sep-21 6:58am
   
OK Dear,Now How?
CHill60 9-Sep-21 7:02am
   
"Click the green "Improve question" link" If it is not visible then hover your mouse over your question
tianlong wang 9-Sep-21 7:35am
   
Step:I put a WrapPanel into the ScrollViewer. There is a button 1 in the window. Click button 1 and add a Button to the WrapPanel. When the number of Buttons in the WrapPanel exceeds the boundary of the WrapPanel, a vertical scroll bar will appear.

My question:I encountered a problem with a vertical scroll bar: when the vertical scroll bar appeared, the WrapPanel (or ScrollViewer?) changed to increase the width of a scroll bar (equivalent to a scroll bar outside). This problem will Causes the layout of other nearby controls to change. How can I fix it?
CHill60 9-Sep-21 7:56am
   
Why have you just repeated your question here?
We cannot fix anything if we can't see your code. Follow the instructions to put your code into your post
tianlong wang 9-Sep-21 22:34pm
   
No code, just a UI layout problem.
This may be a bug in the design of Scrollviewer by Microsoft. My question is: For example, the width of the WrapPanel in the Scrollviewer is 200. When the Scrollbar does not appear, the width of the WrapPanel is 200, but when the Scrollbar appears, it is actually on the WrapPanel. Increase the width of a vertical scroll bar, then the WrapPanel width becomes 220 (I estimate the scroll bar width is 20), and now because of the additional scroll bar width, the WrapPanel in the Scrollviewer will move to the left, leading to other irrelevant controls on the left There was an error in the layout of.
I want the Scrollviewer to display scroll bars without changing the width automatically, so that the WrapPanel will not move to the left.
CHill60 10-Sep-21 4:51am
   
"No code" - you've heard of XAML?
tianlong wang 10-Sep-21 10:06am
   
Ok, dear, I made a demo, and now I have updated the question, please help me to see how to solve the problem.
tianlong wang 10-Sep-21 10:24am
   
You can also directly look at picture 1 and picture 2, I put the link, you can understand my problem by comparing
tianlong wang 9-Sep-21 7:36am
   
I open this page normally

1 solution

You need a right margin on the ScrollViewer "contents" if you don't want the contents obscured by the scroll bar. It's the width of a Repeater button; since that's what a scroller uses. Styling the width of a Repeater affects the scroller width. There's also ScrollViewer (inside) Padding.

So, Margin, Padding, or Repeater button style; or all of the above.
   
Comments
tianlong wang 9-Sep-21 22:32pm
   
No, I want to block. This may be a bug in the design of Scrollviewer by Microsoft. My question is: For example, the width of the WrapPanel in the Scrollviewer is 200. When the Scrollbar does not appear, the width of the WrapPanel is 200, but when the Scrollbar appears, it is actually on the WrapPanel. Increase the width of a vertical scroll bar, then the WrapPanel width becomes 220 (I estimate the scroll bar width is 20), and now because of the additional scroll bar width, the WrapPanel in the Scrollviewer will move to the left, leading to other irrelevant controls on the left There was an error in the layout of.
Gerry Schmitz 10-Sep-21 11:37am
   
What does "I want to block" mean? I said to add a margin to the content; stop talking and listen.

WrapPanel Margin="0,0,16,0" ...
tianlong wang 10-Sep-21 20:05pm
   
I have updated the question. You can understand my problem by comparing Picture 1 and Picture 2. The position of the buttons in the WrapPanel has changed because of the scroll bar in the WrapPanel.
tianlong wang 9-Sep-21 22:33pm
   
I want the Scrollviewer to display scroll bars without changing the width automatically, so that the WrapPanel will not move to the left.

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