Smearing in text indicators when mouse scrolling (broken redraw?)

[billko]

---

@aputman wrote:

For the indicator to redraw with the scrollbars but not with the mouse seems to indicate that it is not a driver issue.  However, it wouldn't hurt to make these changes and see what happens.

Are any of those experiencing the issue running Labview on a laptop?  

---

My posit was that anything to do with failed redraws is usually due to some kind of incompatibility with a video driver.  I know that my mouse driver differentiates between using the scroll bar and using the wheel.  Something about "smooth scrolling".  I venture to say that, depending on this setting, it uses accelerated graphics or standard scrolling to accomplish the task.

[algarcia]

Hi all,

I'm seeing the "smeary" behavior when scrolling on the string control vertical scrollbar using the mouse wheel. As mentioned, when clicking on the arrows on the scroll bar, the text isn't smeared. 

However this behavior isn't seen when the text cursor is placed inside of the string control and then the mouse wheel is used.

Also a clarifying statement,  the structure included in the Smeary string.vi is a string control not a string indicator. After wiring a string indicator to your control in the VI, the text isn't smeared when scrolling on the indicator. This smeared text behavior is only observed with the string control. 

Regards,

[Ben]

---

@algarcia wrote:

Hi all,

I'm seeing the "smeary" behavior when scrolling on the string control vertical scrollbar using the mouse wheel. As mentioned, when clicking on the arrows on the scroll bar, the text isn't smeared. 

However this behavior isn't seen when the text cursor is placed inside of the string control and then the mouse wheel is used.

Also a clarifying statement,  the structure included in the Smeary string.vi is a string control not a string indicator. After wiring a string indicator to your control in the VI, the text isn't smeared when scrolling on the indicator. This smeared text behavior is only observed with the string control. 

Regards,

---

That was everything except a CAR#.

Could you please provide a CAR# ?

Ben

[mcduff]

An update. I went back and checked my case.

1. It was a string indicator, not a control.
2. It had a transparent background.
3. When I changed the background from transparent to a color, the smearing stopped.

The transparent background seems to be linked to the problem.

mcduff

[algarcia]

Hi all,

The information has been passed onto R&D, and they'll look into resolving the issue for a future version of LabVIEW. 

CAR#: 660883

Regards,

[elset191]

This has been a problem for a while.

https://forums.ni.com/t5/LabVIEW/String-indicator-vertical-scroll-bar-BUG/m-p/2539204

[User002]

Hard to have hope for a fix when the bug is 5 years old.

[Ben]

---

@User002 wrote:

Hard to have hope for a fix when the bug is 5 years old.

---

Make a case for why it should be a high priority and hope is a little easier.

Ben

[prettypwnie]

Why has this bug not been fixed yet? So sad.... 

For my application, coloring the string indicator the same color as the panel is not a fix because I am using a gradient as the background.

Also some people in this thread said that the smearing only happens for controls but not indicators or only for classic but not modern. But I have tried it with all of these and still see the smearing behavior on scroll wheel.

Sigh, I guess I'm just complaining, but does anyone have any ideas of other work arounds?

[NIquist]

You didn't say what version of LabVIEW you were using but I just tried it on 2018 and it's still bugged.  It seems linked to the mouse hover feature so if you select "On Key Focus" on the Key Nav page of its properties it will scroll without glitching BUT you have to click in the window (or TAB to it) to bring it in focus first.

EDIT:  Just checked with the rest of the string controls and they all do it too, even NXG.  I can't believe I never noticed this before if it's that old an issue.  Even more strangely, the bug has turned the text into some kind of latin-like, alien language about some guy named Lorem Ipsum!