B4A Library [Lib] ScrollView2D

Informatix · Jul 4, 2012

Hello,

Does it need a long explanation ? You can scroll in the two directions.

This lib does not work with Android versions < 2.

v1.01:
I fixed a big bug in the original code.
I added the function SmoothScrollTo.

v1.02:
I restarted from a fresh basis because of the many bugs in the original code. I fixed most of them (now, multitouch events and hardware keys are correctly handled) but a few are left and need more work (sometimes the wrong object get the focus and resizing is not perfectly handled). I noticed by the way that the stock scrollview is bugged and does not set the focus correctly if you move your finger very slowly.
Thanks to Erel, I solved the problem with the B4A documentation.
I added a new function: FullScroll.

v1.03:
I fixed all known bugs (including bugs found in ScrollView & HorizontalScrollView);
I added the scrollbars;
I added three new functions:
- ScrollbarsVisibility
- FadingEdges
- GiveFocusToFirstVisible.

v1.1:
I fixed a problem with events that were not fired if declared in a class;
I added two functions: ScrollingIsFinished and DisableTouchEventInterception.

v1.2:
SV2D appears now as a custom view in the designer with all its properties.

v1.3:
I fixed a bug (SV_2 = SV_1 did not work because the inner panel was declared in the wrong class).

Enjoy,
Fred

Informatix · Jul 22, 2014

Brian Robinson said:
Hi Informatix,

Thanks for the extra info about the ScrollingIsFinished property. Yes, I understand that while dragging the items in the scrollview would need to handle that property to be true as it would not know whether the user was still scrolling. This could be a problem for one of the things that I want to do, but not related to my original post. I have included an example that gives an idea of what I am trying to do, and where I have put a comment about showing the debugger is where I have put a breakpoint. When this breakpoint is reached, I can see that the scrollview is in fact still scrolling on the device. Maybe this is just related to the debugger as it is hard to tell, as the other scrollchanged sub (commented out) I have defined seems to partially work.

What I am trying to do is work out when the scrolling stops, which of the inside panels we are on, so that I can then make sure only that panel is visible. The next challenge will be allowing the drag. Is it possible to still capture the Touch events to see if the finger has been released?

Thanks for any assistance.

The solution is more complicated than you think. Detecting if the finger is up (with the Reflection library) is not enough. I modified your example to show you how to do. I cannot guarantee that is 100% reliable but that seems to work fine.

Brian Robinson · Jul 22, 2014

Informatix said:
The solution is more complicated than you think. Detecting if the finger is up (with the Reflection library) is not enough. I modified your example to show you how to do. I cannot guarantee that is 100% reliable but that seems to work fine.

Great work.... After some quick testing it seems to work perfectly. I have modified my code and the snap to position works as I was hoping it would. I really need to start looking how reflection can be applied so I can work things like this out myself. I just don't get time.

Many thanks for such a quick and thorough reply.

Ajay Kakar · Aug 14, 2014

Thanks a ton. I will try it out at once.

micheleBr · Oct 6, 2014

Hi !
Is it possible use ScrollView2D (horizontal mode) inside a ScrollView (vertical mode)?
tnx!!

klaus · Oct 6, 2014

What for ?
You can scroll ScrollView2D horizontally and vertically !

micheleBr · Oct 6, 2014

Yes I know, I would like to build a special layout, something like in yahoo meteo app. (ScrollView2D/horizontally for "next hours section").

klaus · Oct 6, 2014

I'm afraid that it will not work properly because of the internal scroll handling.

pesquera · Dec 23, 2014

Hi Informatix, I've donated 25 euros.. I sent my email with my info on a conversation.. thanks

LucaMs · Jun 3, 2015

Hi, @Informatix.

Can you take a look to this post (and the previous), related to your ScrollView2D?

Many thanks

Informatix · Jun 4, 2015

LucaMs said:
Hi, @Informatix.

Can you take a look to this post (and the previous), related to your ScrollView2D?

Many thanks

A standard scroll (not a fling) is made of a lot of micro motions. Trying to find a global direction and locking it would be too cumbersome to implement in the current code.

LucaMs · Jun 4, 2015

Informatix said:
A standard scroll (not a fling) is made of a lot of micro motions. Trying to find a global direction and locking it would be too cumbersome to implement in the current code.

Thanks to my perfect English, I did not understand the answer (but I understand that the change is complicated).

Thanks for the reply, @Informatix

Micholl · Jul 6, 2015

Hi Informatix,
is version 1.1 from this thread the latest version of this lib?
Background: I have faced a problem while using flexible table from Klaus
and surprisingly found a higher version of this lib in my folder which has
caused the problem. Maybe I got this version from ULV?

Michael

Informatix · Jul 6, 2015

Micholl said:
Hi Informatix,
is version 1.1 from this thread the latest version of this lib?
Background: I have faced a problem while using flexible table from Klaus
and surprisingly found a higher version of this lib in my folder which has
caused the problem. Maybe I got this version from ULV?

Michael

Recent versions of ULV do not include this Scrollview version. It was made for earlier versions of ULV and it is not needed any longer. You should remove it and use the one available in this forum.

Micholl · Jul 6, 2015

You should remove it and use the one available in this forum.

Already done this . Thank you the info!

Michael

EnriqueGonzalez · Jul 9, 2015

Hello!

i have question with this lib and with GestureDetector specifically with the drag event. The drag begins, it moves (but way to little, almost nothing) the view(Button) but suddenly stops and begins to scroll the panel.

How can i prevent this from happening? the main idea is that if the users touches the button with the gesturedetector it only moves the button? many many thanks!!

EnriqueGonzalez · Jul 10, 2015

I think i just found a kind of solution

Programmatically pass (or delay) touch event to panel...?

I will try AND reporta, thanks again!

Informatix · Jul 10, 2015

Enrique Gonzalez R said:
Hello!

i have question with this lib and with GestureDetector specifically with the drag event. The drag begins, it moves (but way to little, almost nothing) the view(Button) but suddenly stops and begins to scroll the panel.

How can i prevent this from happening? the main idea is that if the users touches the button with the gesturedetector it only moves the button? many many thanks!!

You can try the DisableTouchEventInterception function of ScrollView2D.

EnriqueGonzalez · Jul 10, 2015

The solution with the reflection Library works like a charm, i tried too the DisableTouchEventInterception but it doesnt work, it seems that it works with the parent of the SV2D and not with the childs.

Thanks for answering!

corvo · Feb 18, 2016

I got a problem whit the sv2d library....i need to create ad horizontal scroll view in a panel whit a graph (ONLY THIS PANEL NEED THE SCROLL, NO THE ENTIRE LAYOUT), this is my code

sv2d.Initialize(1000dip, 500dip, "scvTest")

pnlLine.AddView(sv2d, 0, 0, 100%x, 100%y)
Dim LD As LineData
LD.Initialize
LD.Target = pnlLine
Charts.AddLineColor(LD, Colors.Red)

It don't give any error but don't works, please any idea?

Informatix · Feb 18, 2016

corvo said:
I got a problem whit the sv2d library....i need to create ad horizontal scroll view in a panel whit a graph (ONLY THIS PANEL NEED THE SCROLL, NO THE ENTIRE LAYOUT), this is my code

sv2d.Initialize(1000dip, 500dip, "scvTest")

pnlLine.AddView(sv2d, 0, 0, 100%x, 100%y)
Dim LD As LineData
LD.Initialize
LD.Target = pnlLine
Charts.AddLineColor(LD, Colors.Red)

It don't give any error but don't works, please any idea?

If you use only the horizontal scroll, then use the HorizontalScrollView not ScrollView2D.
Anyway, you maybe face an OutOfMemory error. I don't know the Charts library so I cannot help.

B4A Library [Lib] ScrollView2D

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