Android Question [B4X] [XUI] SD XUIScrollView2D is flickering

klaus · Jun 6, 2019

I just tested the XUIScrollview2D library.
I noticed that the movement of the table is flickering when scrolling insides the table, with the finger in B4A or the mouse cursor in B4J.

Star-Dust · Jun 6, 2019

Thanks for the reporting . I will try correct it

Star-Dust · Jun 6, 2019

Try the new version and let me know if it improves

klaus · Jun 6, 2019

I will do it tomorrow, I am leaving right now.

klaus · Jun 7, 2019

It is still flickering in B4A especially when you move the finger slowly.
In B4J it doesn't flicker anymore but the displacement of the panel is smaller than the displacement of the mouse cursor, this happens also in B4A.

Star-Dust · Jun 7, 2019

klaus said:
In B4J it doesn't flicker anymore but the displacement of the panel is smaller than the displacement of the mouse cursor, this happens also in B4A.

Could you observe if the movements were of the right speed in the previous version?

klaus · Jun 7, 2019

The behaviour is the same in both versions.

Star-Dust · Jun 7, 2019

The thing is more complicated here than you thought because of the use of the XUI library. And anyway it's not clear why he sends coordinates even if you don't move your finger.

I'll tell you in the coming days

Star-Dust · Jun 7, 2019

try release 0.05

klaus · Jun 8, 2019

Sorry, but still the same.
Attached a small video, unzip it to an mp4 file.

klaus · Jun 12, 2019

The flickering of the scrolling in your project comes from the fact that you use the Touch event of the internal panel PanelLocal_Touch and not the parent panel mBasePanel_Touch.
The PanelLocal.Left and PanelLocal.Top properties are changed during scrolling producing the flickering.

I have begun to write my own, see here.

Star-Dust · Jun 12, 2019

I'm sorry, but I couldn't work on it, I took a few days off because of illness.

Thanks for the suggestion, I'll try in the coming days.

klaus · Jun 12, 2019

Don't worry!
I wish you a quick recovery.

Star-Dust · Jun 14, 2019

try release 0.06

klaus · Jun 14, 2019

Thank you.
I had seen it yesterday evening and put it on my to do list for today.
The flickering is no more present !

There is a problem with scrolling with the finger.
When we add views with events like a table with labels onto the scrollview, this one doesn't scroll anymore with the finger.
The only possibility is with the scrollbars.

A suggestion for the scrollbars.
Make the bar scrolling only when the user touches the cursor.
And when the user clicks on the scrollbar outsides the cursor scroll 1 page, like in windows.

Star-Dust · Jun 14, 2019

klaus said:
There is a problem with scrolling with the finger.
When we add views with events like a table with labels onto the scrollview, this one doesn't scroll anymore with the finger.
The only possibility is with the scrollbars.

This is because the views above the panel absorb the touch event.
I excluded the possibility of addi a transparent panel over the views would allow a constant scrolling but would cancel the events of the other views.

klaus said:
A suggestion for the scrollbars.
Make the bar scrolling only when the user touches the cursor.
And when the user clicks on the scrollbar outsides the cursor scroll 1 page, like in windows.

In the first version it was actually like that, then for a reason I don't remember I modified it.
I will try to do it again.

Thank you for your suggestion

klaus · Jun 14, 2019

Star-Dust said:
This is because the views above the panel absorb the touch event.

I know, but for me this is a problem because phone and tablet users would want it.
I have not yet looked if there is a possibility to send the event to the underlying view in Android.
In B4J it works in my scrollview.
And, if I remember well, in B4i it's also the case.

Star-Dust · Jun 14, 2019

klaus said:
I know, but for me this is a problem because phone and tablet users would want it.
I have not yet looked if there is a possibility to send the event to the underlying view in Android.
In B4J it works in myscrollview.
And, if I remember well, in B4i it's also the case.

If you think it is useful I can create the possibility to enable a panel above for scrolling but which cancels the events of the underlying objects.
I can always make an option to enable or disable it.

klaus · Jun 14, 2019

I know these possibilities, but for me these are workarounds and not what I am 'dreaming' of.

Erel · Jun 16, 2019

Check B4XDrawer code for the best approach to handle such cases. It is more complicated but the result is that the user can both interact with the visible controls and can scroll the underlying control.
It is relevant for B4A and B4i.

Android Question [B4X] [XUI] SD XUIScrollView2D is flickering

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