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Slow Scrolling With sfRichTextBoxAdv

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128849 Feb 12,2017 08:15 PM Feb 15,2017 07:24 AM WPF 3
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Tags: SfRichTextBoxAdv
Alan Burkhart
Asked On February 12, 2017 08:15 PM

I'm using sfRichTextBoxAdv via ElementHost in a Winforms (VB.net) project. Seems to work fine except that scrolling is very slow. Using the scrollbar arrows it jumps a few pixels at a time with a half-second between jumps. Dragging the scrollbar thumb produces a hesitation followed by a half-page jump. The same problem occurs in the "Document Editor" sample project. The same .rtf file scrolls smoothly when opened in Libre Office. It's a small (5 pages) file with no graphics.

Is this an issue with the control? If so is there a workaround to get smoother scrolling?

Thanks -- AB


Venkatesan Mani [Syncfusion]
Replied On February 13, 2017 05:38 AM

Hi Alan, 
 
Thank you for contacting Syncfusion support. 
 
We have improved the scrolling responsiveness in our SfRichTextBoxAdv control and included this fix in our latest Essential Studio Volume 1, 2017. It is rolled out and is available for download under the following link. 
 
https://www.syncfusion.com/forums/128853/essential-studio-2017-volume-1-release-v15-1-0-33-is-available-for-download  
  Kindly update to the latest version (15.1.0.33) and test the scrolling responsiveness in our SfRichTextBoxAdv. Please get back to us, if you require any further assistance.    Regards,  Venkatesan M. 

Alan Burkhart
Replied On February 14, 2017 01:47 AM

Installed the update. Scrolling still sputters a bit but is improved. In all honesty, the scrolling issue still makes the control unusable for a production project. Still needs work. Another issue exists with this update: Now the files have entire paragraphs replaced with empty space when scrolling. This seems to occur more when dragging the scrollbar thumb than when using the arrows. But it happens in both cases. I tried it with both .doc and .rtf files with same result.

Venkatesan Mani [Syncfusion]
Replied On February 15, 2017 07:24 AM

Hi Alan, 
 
Thank you for your update. 
 
Regarding scrolling performance: 
Currently, we have handled UI Virtualization in our SfRichTextBoxAdv control by default, to utilize optimal memory. Hence the content within view port of SfRichTextBoxAdv control will be rendered during initial load. While scrolling, the contents will be rendered dynamically when brought into viewport. 
 
Regarding the issue “paragraphs replaced with empty space when scrolling”:    
We can reproduce the mentioned issue in our SfRichTextBoxAdv control. A support incident to track the status of this issue and the feature (scrolling performance) has been created under your account. Please log on to our support website to check for further updates 
 
 
Regards, 
Venkatesan M. 


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