allowVerticalDrag() doesn't work on scroll list

[nico23]

The same issue has been reported years ago https://community.st.com/t5/stm32-mcus-touchgfx-and-gui/method-allowverticaldrag-in-scroll-list-container-does-not-seem/m-p/169035#M10136

If you create a mySelectorScroll and in the code mySelectorScroll.allowVerticalDrag(false); the scroll list will continue to be scrollable no matter what

Also, accoridng to docs (https://support.touchgfx.com/docs/api/classes/classtouchgfx_1_1_scroll_base#function-allowverticaldrag) it should be OFF by default

 

enable

If true, vertical scrolling is enabled. If false (default), scrolling is disabled.

[GaetanGodart]

Hello @nico23 ,

 

Can you try to call 

mySelectorScroll.childGeometryChanged();

 

I had a similar question where someone asked why the scrollbar width did not update after he changed it and it solved the issue :

scrollableContainer1.setScrollbarWidth(20);
scrollableContainer1.childGeometryChanged();

Somehow, the scrollbar is a child of the scrollableContainer and therefore need to be updated.

 

If that doesn't work, can you tell me what is "mySelectorScroll"? Is it a standard scrollList or is it a custom container?

 

Regards,

[nico23]

Hi @GaetanGodart 

I'm using a standard Scroll List, not a Scrollable Container and I feel, according to docs (https://support.touchgfx.com/docs/api/classes/classtouchgfx_1_1_scroll_list) it has not that method.

Also, I'm not setting the height/width dynamically.

The Scroll List uses as items a custom container.

A workaround seems to be settings accelerations to 0

mySelectorScroll.setDragAcceleration(0);
mySelectorScroll.setSwipeAcceleration(0);

 

[GaetanGodart]

The scrollList inherit from drawable which have the method childGeometryChanged :

 

Setting the drag speed to 0 indeed prevent any movement, that could be a workaround for you. :)

 

Have you tried to call childGeometryChanged() though?

 

Regards,

[nico23]

I've called 

mySelectorScroll.childGeometryChanged();
mySelectorScroll.allowVerticalDrag(false);

but the issue persisted

[GaetanGodart]

Can you try to put the childGeometryUpdate after the allowVerticalDrag?

 

Regards,

[nico23]

same, the issue persisted

EDIT: on another note, why the docs says the drag should be OFF by default when it is clearly not? @GaetanGodart 

[GMeur]

I want to mention as well that this code in the ScrollBase class :
void ScrollBase::setHorizontal(bool horizontal)
{
allowVerticalDrag(horizontal);
allowHorizontalDrag(!horizontal);
list.setHorizontal(horizontal);
}
is incorrect, the logic should be reverted :
void ScrollBase::setHorizontal(bool horizontal)
{
allowVerticalDrag(!horizontal);
allowHorizontalDrag(horizontal);
list.setHorizontal(horizontal);
}