Scrolling arragement by clicking on Canvas (in AI2 OffLine)

MIT App Inventor Help
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1

Hi.
I created simple app (in AI2 OffLine). I use VerticalScrollAragement with some buttons, and labels, and one canva with image - and scrolling works fine, when i touch and slide on button, background, label, but when i try to scroll by touchuning Canva - nothings move. I searched for this case, because i can't find the same issue. I found scrolling handler extension, but this is not what im looking for.
Did somebody have the same issue, or solution? :slight_smile:

2

Search this board for Go Scroll Yourself to get a sample of scrolling through a canvas.

3

Thanks, but this is not what im looking for, but the scroll bar is not accepted by design.

4

I ran a test, (using proper AI2!) I am able to scroll a vertical scrolling arrangement with a canvas in it. Android 9 & 13 using companion app.

Do you need to display your image in a canvas?

Or do you want to scroll the arrangement using a canvas (your original post is not clear on this ?)

5

Thanks for fast answers :slight_smile:
Yes - I want to scroll the arrangement using a canvas (placing finger on the canva and moving the screen). In my app, scrolling a vertical arrangement with canvas work fine too, but doesn't work when i place finger on canva :slight_smile:

Yes, i need display image in canva, because it work as custom color picker.

Canva gets about 50% of the screen, so when somebody use this app - it feels like the app is stuck :smiley:

6

Then @ABG 's solution (above) is what you are looking for

7

My issue on the simple graphic :slight_smile:

issueeee
issueeee1952×960 163 KB

8

So you do not want to scroll the arrangement using a canvas, you want to scroll the arrangement when dragging the canvas inside a vertical scrolling arrangement.

Probably the canvas blocks for selecting a colour are overriding the arrangement scroll. You should be able to scroll the arrangement to the side of the canvas if your canvas is not set to screen width.

9

So all I can do is reduce the canvas (to reduce the effect of application stuttering), and accept this inconvenience :slight_smile:

Edit: i changed strategy - added the canva with color picker on another arrangement, which not need to slide/scroll, because is displayed alone. After picking the color, user click "Back" button, and picker takes hidden.

3 Likes
10

If that is the sole purpose of the Canvas, you can avoid the problem by treating the Canvas as a pop up, exposing it on request, and hiding it after selecting a color.

11

Yes, i described this solution in last post.