I could use some n00b level help I saw the announcement for kotlinlang #doodle

I could use some n00b level help. I saw the announcement for 0.8.0 and decided to give it a try. However, I seem to be missing something important. More in thread:

When I run the code below (JVM), I see only a blank window, and

init

and

Hello World!

are printed to the console.

rendering

is never printed, and nothing shows up in the window. Am I missing something to get the rendering to actually start?

Untitled.cpp

Using a

view { ... }

block in the app init appears to work fine. Not sure what the difference is, as

ViewBuilder

appears to be a very simple wrapper.

Nick

07/09/2022, 5:16 PM

Views will only render if they have a non-zero size. You need to set some size to UserInfo, since it defaults to 0.

Ruckus

07/09/2022, 5:17 PM

Ah, I see. So views don't automatically calculate their size bases on contents?

I guess that makes sense if everything is essentially just canvas draws. What would be the appropriate way to make this view match its size automatically?

Nick

07/09/2022, 5:18 PM

They don't.

Ruckus

07/09/2022, 5:20 PM

Also, why does the

view { ... }

block work?

Nick

07/09/2022, 5:20 PM

TextMetrics is used for calculating the size of text. So you can compute the size upon unit in the UserInfo and set a size then. Of course you're drawing two lines, so you'd account for that in the calculation.

Work as in?

Ruckus

07/09/2022, 5:25 PM

Ah, I see. Also, the block version does not appear to work for me now. I must have had a

size = display.size

in there the first time and not noticed. Thanks for the help!

(By works I meant it was showing up in the window and printing to the console)

Nick

07/09/2022, 5:38 PM

I see. You can also set a Layout on the display to have it manage the size of the top level Views.

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