Horizontal scroll bar in non-continuous and Ribbon Layout mode

rakunavi · Post by **rakunavi** » Sat May 07, 2022 7:24 am

Hello all,

I have found the following three issues with horizontal scroll bar when the page display is in non-continuous ("Single Page" or "Two Pages") and "Ribbon Layout" mode.

(A) The page doesn't scroll when dragging the horizontal scroll bar thumb.
(B) The page doesn't scroll when the mouse wheel is operated over the horizontal scroll bar.
(C) The page doesn't scroll to the last page even if the arrow button on the right end of the scroll bar is pressed.

In addition, the following two issues were found with horizontal scroll bar in non-continuous "Two Pages" and "Ribbon Layout" mode.

(D) The length and position of the horizontal scroll bar thumb does not correspond to the actually displayed page.
(E) The horizontal scroll bar is not displayed for a specific page size and total number of pages.

Note that when the mouse wheel is operated over the area where the document is displayed, or when the scroll bar area other than the thumb, i.e., the scroll area, is clicked, it operates normally. Even in non-continuous mode, everything works fine for "Standard Layout". I can't think of any use case where the combination of non-continuous mode and "Ribbon Layout" would be effective, but it is interesting to see the difference in behavior between "Standard Layout" and "Ribbon Layout."

Please see the attached verification video.

CapturedVideo.zip: (1.8 MiB) Downloaded 12 times

Sample.zip: (6.63 KiB) Downloaded 13 times

In the video, the page is scrolled by dragging the scroll bar thumb and operating the wheel over the scroll bar. It also attempts to scroll to the last page by pressing the arrow button at the end of the scroll bar. Each corresponds to the verification of the three issues (A) through (C) described at the beginning of this report.

In the first half of the video, the verification with the "Standard Layout" shows that both (A) and (B) work fine, and (C) scrolls to the last 100 pages. However, in the second half of the video, the verification with the "Ribbon Layout" shows that both (A) and (B) do not respond at all, and (C) scrolls only to the middle 50 pages.

As for the verification of the issue (D), in the second half of the video, the video is verified in Two Pages mode, so you can see that the length and position of the horizontal scroll bar thumb does not correspond to the total number of pages (100 pages).

Regarding the issue (E), when a new document is created under the following conditions, set to non-continuous "Two Page" and "Ribbon Layout" mode, and the zoom level is set to, for example, "Fit Page", the horizontal scroll bar is not displayed.

Standard: B5 (182 x 257mm)
Orientation: Portrait
Count: 6

Please see the attached verification video for details.

CapturedVideo2.zip: (1.05 MiB) Downloaded 13 times

Hoping that the above information will be of some help to you.
Thank you so much for your continued support.

Best regards,
rakunavi

- PDF-XChange Editor Plus Version:9.3 build 361.0
- OS Version: Windows 10 Home 21H2 Build 19044.1645
- PC Model: Lenovo IdeaPad C340-15IWL / HP ProDesk 600G1

Post by **Paul - Tracker Supp** » Tue May 10, 2022 6:41 pm

Thanks Rakunavi,

Thanks for the detailed report.

I have passed this on to the Dev team member responsible for this stuff and we'll have to wait and see what comes.

rakunavi · Post by **rakunavi** » Tue May 10, 2022 11:38 pm

Hi Paul,

Thanks for your comment. Not a horizontal scroll bar issue, but I found another issue with other conditions being equal, which I will report in this topic.

In non-continuous ("Single Page" or "Two Pages") and "Ribbon Layout" mode, if the zoom level is set to "Fit Page", etc. and there are pages with a lower page height than the other pages, scrolling with the wheel will not work when those pages are displayed.

The verification procedure is as follows

Open the file.
Change to non-contiuous (either Single Page or Two Pages is acceptable) and Ribbon Layout. Set the zoom level to "Fit Page".
Turn the pages with the wheel.
The wheel scrolling should stop in the middle of the page.
Use the page navigation icons or shortcut keys to move to the last page.
Turn back the pages with the wheel.
The wheel scrolling should stop in the middle of the page.

I have prepared two files, one for the case where the page height is decreased and the other for the case where the page height is increased.

SampleFiles.zip: (10.08 KiB) Downloaded 14 times

Sample file No.1 "PageHeight_Decreases.pdf"
A4 size document with 20 pages in total, the height of the first 10 pages is 297mm (standard) and the height of the last 10 pages is 296mm (1mm lower than the standard).

Sample file No.2 "PageHeight_Increases.pdf"
A4 size document with 20 pages in total, the height of the first 10 pages is 297mm (standard) and the height of the last 10 pages is 298mm (1mm higher than the standard).

The screen of the verification process was captured for reference, so please check the attached video for details.

CapturedVideo.zip: (2.11 MiB) Downloaded 13 times

In the verification video, issues occur at the following timecode.
([MM:SS] "MM" shows minutes, and "SS" shows seconds.)

[00:00]-[00:36] Verification with the sample file No.1 "PageHeight_Decreases.pdf"

[00:13] In Step 4 of the above procedure, wheel scrolling should stop at page 11.
[00:28] In Step 7 of the above procedure, wheel scrolling should stop at page 20. In other words, after the last page is displayed, wheel scrolling will no longer function.

[00:37]-[01:07] Verification with the sample file No.2 "PageHeight_Increases.pdf"

[00:45] In Step 4 of the above procedure, wheel scrolling should stop at page 1. In other words, after the first page is displayed, wheel scrolling will no longer function.
[01:03] In Step 7 of the above procedure, wheel scrolling should stop at page 10.

Hoping that the above information will be of some help to you.
Thank you so much for your continued support.

Best regards,
rakunavi

- PDF-XChange Editor Plus Version:9.3 build 361.0
- OS Version: Windows 10 Home 21H2 Build 19044.1645
- PC Model: Lenovo IdeaPad C340-15IWL / HP ProDesk 600G1

Post by **Paul - Tracker Supp** » Wed May 11, 2022 5:31 pm

Hi Rakumani,

we will look into this. There is a ticket to make sure it is not lost in the mix: RT#6073: Scrolling issues with the mouse wheel under certain conditions.

Thanks again for the detailed report.

rakunavi · Post by **rakunavi** » Wed May 11, 2022 8:59 pm

Hi Paul,

Thank you for your attention to this matter.

As mentioned above, no user would willingly use a combination of non-continuous mode and Ribbon Layout. However, even if a user uses a combination of continuous mode and Ribbon Layout, when an external PDF file is opened from a link, it will be displayed using the default opening method for that file, so it is possible that the non-continuous mode and Ribbon Layout combination will be used unintentionally. Since PDF files that are initially set to continuous mode will be rare, users who prefer Ribbon Layout are likely to encounter the issues reported in this topic.

I'm looking forward to future updates.

Best Regards,
rakunavi

Wed May 11, 2022 10:05 pm