Bug? B4XImageView Tag field purpose?

agraham · Dec 18, 2020

B4XImageView has a Public Tag As Object field but if you try to use it it will be compiled as a gettag() method and cause a missing symbol compilation error.

Regex problem

I try App from @LucaMs. I put the code in B4XPage ( @Erel example ThreePagesExample). The code from @LucaMs is working fine, but in B4XPages i get error: B4A Version: 10.2 Java Version: 11 Parsing code. (0.18s) Building folders structure. (0.05s) Running custom action. (0.05s) Compiling...

www.b4x.com

Was there an intended use for this public field or is it a bug?

LucaMs · Dec 18, 2020

It works well:

agraham · Dec 18, 2020

Wrong! I am referring to B4XImageView NOT B4XView or ImageView.

LucaMs · Dec 18, 2020

agraham said:
Wrong! I am referring to B4XImageView NOT B4XView or ImageView.

Even with the B4XImageView the Tag property (or is it just a public variable?) does not give problems, works properly.

agraham · Dec 18, 2020

It compiles wrongly in the example I linked to which is why I want Erel's comment on it.

LucaMs · Dec 18, 2020

agraham said:
It compiles wrongly in the example I linked to which is why I want Erel's comment on it.

But we don't know what is the bug in that code; certanly not the Tag property of B4XImageView, which has no bugs.

agraham · Dec 18, 2020

In that example you can clearly see the original B4A code and the resulting Java code which has compiled the Tag field as a method access. I want Erels' comment on it.

LucaMs · Dec 18, 2020

@stari posted only a routine, not a project, so I assume you have compiled your own project, including his code; post it.

agraham · Dec 18, 2020

I'm not arguing any more. If you can't see my point then stop and wait for Erel to comment.

LucaMs · Dec 18, 2020

LucaMs said:
@stari posted only a routine, not a project, so I assume you have compiled your own project, including his code; post it.

no, you have not compiled, you have read the error message.

LucaMs · Dec 18, 2020

agraham said:
I'm not arguing any more. If you can't see my point then stop and wait for Erel to comment.

Don't get nervous, it's not worth it.
Of course, I stop writing when I decide (or Erel, of course ?)

This is more or less the code posted by @stari. I wrote the string value of the Tag, obviously, he didn't; and this code doesn't produce that error.

B4X:

Sub Class_Globals
    Private Root As B4XView
    Private xui As XUI
  
    Private TappedCard As B4XImageView
End Sub

Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    Root.LoadLayout("MainPage")
  
    TappedCard.Tag = "abc_def.png"
  
    Dim card_name As String
    card_name = Regex.Split("_", TappedCard.Tag)(0).Replace("_", " ").Replace(".png", "")
    Log(card_name)
End Sub

Log:
abc

LucaMs · Dec 18, 2020

@stari has probably put some ImageViews in his layout; then, in the click event, he assigns the Sender object to a local variable of type B4XImageView and this is the problem.

stari · Dec 18, 2020

LucaMs said:
Don't get nervous, it's not worth it.
Of course, I stop writing when I decide.

This is more or less the code posted by @stari. I wrote the string value of the Tag, obviously, he didn't; and this code doesn't produce that error.

B4X:

Sub Class_Globals Private Root As B4XView Private xui As XUI Private TappedCard As B4XImageView End Sub Private Sub B4XPage_Created (Root1 As B4XView) Root = Root1 Root.LoadLayout("MainPage") TappedCard.Tag = "abc_def.png" Dim card_name As String card_name = Regex.Split("_", TappedCard.Tag)(0).Replace("_", " ").Replace(".png", "") Log(card_name) End Sub

Log:
abc

Hello
I trayed your sample.
I create Page5 in project from @Erel, TrhePagesExample.
Exactly the code you wrote, i put in Page 5. And?
I get ste same error message:
Compiling generated Java code. Error
B4A line: 23
TappedCard.Tag = \
src\b4a\example\b4xpage5.java:102: error: cannot find symbol
__ref._tappedcard /*b4a.example.b4ximageview*/ ._settag((Object)("abc_def.png"));
^
symbol: method _settag(Object)
location: variable _tappedcard of type b4ximageview

LucaMs · Dec 18, 2020

stari said:
I trayed your sample.

You can't write that you tried my example without indicating which one!

I had to look for it and I suppose you are referring to this:
https://www.b4x.com/android/forum/threads/card-flip-flip-between-2-images.113408/post-708588

It has:

B4X:

Sub Card_OneClick
    Dim Card As clsCard = Sender
    Card.FlipAnim(True)
End Sub

where, as you can see, the object clicked is of type clsCard, a class I created and included, not a B4XImageView or other stuff.
The project you attached here does not include that class (clsCard).

LucaMs · Dec 18, 2020

Found the problem.

LucaMs said:
where, as you can see, the object clicked is of type clsCard, a class I created and included, not a B4XImageView or other stuff.

My clsCard class uses @Star-Dust's SD_XUIVew library, which provides its own B4XImageView (same name, big problem!).

stari · Dec 18, 2020

LucaMs said:
Found the problem.

My clsCard class uses @Star-Dust's SD_XUIVew library, which provides its own B4XImageView (same name, big problem!).

Thks.

AnandGupta · Dec 19, 2020

LucaMs said:
My clsCard class uses @Star-Dust's SD_XUIVew library, which provides its own B4XImageView (same name, big problem!)

Hmmm.. finally Star dust need to change it to sd_b4ximageview, right ?

Regards

Anand

Erel · Dec 20, 2020

@agraham
That project is based on sd_xuiview.

Can you upload a project based on XUI Views?

This code seems to work fine:

B4X:

Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    Root.LoadLayout("MainPage")
    Log(B4XImageView1.Tag)
End Sub

agraham · Dec 20, 2020

Erel said:
Can you upload a project based on XUI Views?

I believe it is sorted now.

Bug? B4XImageView Tag field purpose?

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