The height of the SyntaxEditor does not seem to be automatically calculated in the RichTextBox's Blo

Hello,

SyntaxEditor doesn't auto-size by default since it adds a lot of additional processing.  This documentation topic talks about an option that does enable it.

Great, it works.

But there is one more question, how do we remove the extra whitespace below?

Hello,

I'm glad that works, but I'm not sure what extra whitespace you are referring to.  If I set the SyntaxEditor.IsViewLineMeasureEnabled property to true and update your document text to only be a few lines long, I don't see any extra whitespace within the editor.

If you are referring to extra whitespace around the editor and within the FlowDocument, that may be added due to the BlockUIContainer.  You'd have to consult Microsoft documentation on anything related to that.

Hello, I'm sorry that I took a few days to continue this issue.

Regarding the extra whitespace issue, you can reproduce it with the following example.

I put two controls, SyntaxEditor and TextBox, into BlockUIContainer to detect their changes.

SyntaxEditor:

https://github.com/lyq-lin/ActiproDemo/blob/main/SyntaxEditorDemo/Image/blank.png

TextBox:

https://github.com/lyq-lin/ActiproDemo/blob/main/SyntaxEditorDemo/Image/textbox.png

From the above examples we can see that they have different manifestations.

Perhaps their different implementation principles lead to this difference, but this brings a little inconvenience to our flexible use of SyntaxEditor.

In addition, I also removed the FlowDocument to verify, the result is also obvious, am I missing something?

demo:

https://github.com/lyq-lin/ActiproDemo/tree/main/SyntaxEditorDemo

So do you have any ideas or suggestions? I just want SyntaxEditor to not have extra empty lines.

I corrected my wording, I didn't mean extra blank lines, I meant extra spaces.

Hello,

Thank you for the screenshots.  It looks like you are referring to the SyntaxEditor.CanScrollPastDocumentEnd property, which is true by default.  You'd want to set that to false to make it so you can't scroll the last line up to the top of the view.  Does that help?

It seems I know why this situation has occurred.

When setting SyntaxEditor.CanScrollPastDocumentEnd=False in FlowDocument, it does not trigger scrolling, and it appears to be captured.

It seems I have encountered other troubles.

However, your suggestions are effective, and I thank you for your patient replies.