How does automatic height work?

Discuss
#1

I am using a dynamic Label that will only appear after I click a button above:

In a block where I call the content of Airtable, I set the Label text and then set its size to 0 so that it is hidden.

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Outside this block of content, when I click the button I reset its size to -1 expecting it to show the text contained.

image

But nothing happens, even if in this block I pass a new text to the Label

How does height -1 work?

** What I need to do: ** I need to show or hide the Label when I click the button. I already thought about creating or deleting the Label instead of using its height as 0 to hide it, but outside my structure context where I have several For Each, one inside the other, I can’t. Another way would be to be able to somehow create or delete this Label right after the button, but I don’t know if this is possible after the dynamic structure is assembled.

It doesn’t seem as simple as explained here:

#2

Hello @jhonidesb.

First, welcome to the community.

Second, I am not quite familiar with dynamic components, I’m still learning. But I saw this kind of writing in the Decoration component.

There, you use a string block for determining the Page 64 3A Automatic and Fill Parent.

So try with the string block instead of the math block, see if it works or not.

Yoshi

#3

Thank you.
But the “Set Height” Block does not support string values.

#4

First of all I have no idea that why App Inventor uses different constant values from android.The constant values defined/used in android are as follows:
Fill Parent/Match Parent : -1
Wrap Content : -2
Now the constant values used in AI are as follows:
Match Parent/Fill Parent : -2
Wrap Content : -1

In answer to your question:
Fill Parent: it will take all available space
Wrap Content: it will take only required space

In android documentation they are defined as follows:
Fill Parent/Match Parent: Special value for the height or width requested by a View. MATCH_PARENT/FILL_PARENT means that the view wants to be as big as its parent, minus the parent’s padding, if any

Wrap Content: Special value for the height or width requested by a View. WRAP_CONTENT means that the view wants to be just large enough to fit its own internal content, taking its own padding into account.

-2/-1 don't work on Dynamic Spaces
#5

Thank you!

But these -2 or -1 parameters have no effect.

If I set a fixed size, 100 for example, then the contents of the Label are shown.
Even when I create the Label, if I set its Height to -1, it just disappears.

#6

If you think it is a bug then report it in respective category :slightly_smiling_face:

Also I don’t think setting height as 0 will effect anything.

#7

Thank you.

But I am not qualified to determine whether this is a bug or not.

What it seems is that if the Label height is manipulated with positive values, it will no longer function automatically.

#8

Why not try visibility property of label?

#9

This property does not exist for the dynamic Label.

#10

I thought you are using Dynamic Component extension by Yusuf Cihan :sweat_smile:
Give it a try.It gives you more customization options.

#11

Nice! I will take a look.

#12

Can you tell me where the documentation is?

I’m not sure what parameters and properties it accepts.

#13

Since extension creates a reflection of original component so all properties and methods will behave same.

#14

So I remain restricted to the properties and methods existing in the native components.
Doesn’t that provide more customization options as you mentioned?
Thanks!

#15

No it does not.
But still it has some more customization options than native dynamic components.

#16

Sorry did not understand.

Do you or don’t you?

Does the label on these components have the “Visible” property?

#17