How to do something made in AppInventor 1 in Appinventor 2

[Oswaldo C. Murrieta]

Hi, first thanks for all the help you guys gave to noobs like me.

Second I've saw a nice tutorial to add a "undo" option to a drawing canvas:

https://groups.google.com/forum/#!searchin/app-inventor-developers-library/undo/app-inventor-developers-library/yF2Auslt82M/e-9D1gSIS78J

But it looks it was made on previus appinventor  interface,  I can't understand how to do the same on AppInventor 2, I've search for a new tutorial for that undo option but I haven't been lucky, I hope you can help me.

(I'm using AppInventor 2, Windows 7 and Chrome browser)

Thanks in advance for your help.

(Sorry english is not my first languaje)

[rodo...@gmail.com]

You have to look at the blocks closely. Some are labeled differently and some are just tweaked in AI 2 than AI1. It takes a while to figure it out but it can be done

[Taifun]

if you want to "translate" an App Inventor Classic example to App Inventor 2, this link can help you: What's different?

Just try something, and if you got stuck, post a screenshot of your relevant blocks

Taifun

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Trying to push the limits of App Inventor! Snippets and Tutorials from Pura Vida Apps by Taifun.         

[Oswaldo C. Murrieta]

Well, thanks for your help, in fact I just need help with the blocks from left, I can't figure how to do that on AppInventor2.

BTW, I've tried to download the UndoRedoAndLinkedLists.zip (from the example using AppInventor1) and rename to  UndoRedoAndLinkedLists.aia, then import it but it hasn't blocks :'(

[Stephen Zipprich]

The blocks on the left look to me like a procedure with arguments and a bunch of other procedures inside that one.  They look like AI2's procedure do to me.

Also, you can't convert an AI classic to AI2 project automatically yet, I don't believe.  Changing the extension of the file will not work.

[Taifun]

see also the documentation about custom procedures http://appinventor.mit.edu/explore/ai2/support/blocks/procedures.html

[Scott Ferguson]

Hi, Oswaldo.

I am looking at your picture of the AI Classic blocks now and I think I can simplify this with AI2 blocks.

But I will need to install AI Classic to look at the old project first.

I will see what I can do and get back to you on this thread in a day or so.

OK.

I now have a version in AI2 blocks here.

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sf

[Oswaldo C. Murrieta]

I've been trying to make it work, but now I'm lost XD

Here is what I've done untl now:

Any idea how to do the miss parts?

[Taifun]

the 2nd screenshot looks fine

the first screenshot does not make sense: you do not want to call the procedure there

now how does the custom procedure PutItem look like?

just translate that procedure into App Inventor 2, too...

Taifun

[Scott Ferguson]

These are the blocks for the identical AI2 version:

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sf

[Oswaldo C. Murrieta]

Thanks Scott Ferguson, I've add the next code:

But when i try to make the undo or redo button I get this screen:

Also te undo or redo action won't work.

[Scott Ferguson]

Your blocks look identical to mine.

Make sure that the undo and redo buttons are disabled in the Screen Designer.

You should not be able to click on them until a line has been drawn on the canvas.

I have a simplified version of the app that does not use linked lists.

I will attach it here when I fixed or removed the additional feature that is not working correctly.

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sf

[Scott Ferguson]

I got it working. I had added undo/redo on the PaintColor but it was a bit tricky to get working properly.

Here is the link to UndoRedo2.aia.

---sf