Examples: could an example be added for LibUI.new_scrolling_area?

[rubyFeedback]

Hello kojix2 and everyone else,

Would it be possible to add a small example for how LibUI.new_scrolling_area
works?

Use case:

Actually I wrote a tiny ruby-gtk3 application that uses mpv to play local .mp3 files.
This is in a scrolled window, with a vbox, containing each local song via a button.

So I click on the button and then mpv plays the song. This is like the ultimate
minimal "jukebox".

On windows I tested - ffmpeg works, mpv works, libui works too.

And using the buttons works as well, but I'd like them in some scrolling container.

Unfortunately I have not yet managed to make this work. I'll google more to see
if I can find an example via scrolling-area, or perhaps I figure it out on my own
eventually. (The malloc and fiddle parts are over my head unfortunately ... I
should have started with C really ... )

At any rate as always please feel free to close the issue request at any moment
in time how you see fit. I also used glimmer-dsl-libui recently to embed images
into a "libui"-widget (on windows), that works too. I got some weird problems
though related to my own ruby code ... would be cool if fiddle-pointer stuff
could get better support for traceback problems. I kind of miss the introspection
you get with ruby methods. :(

[rubyFeedback]

I found it works on kotlin:

https://nicedoc.io/msink/kotlin-libui

Screenshot:

https://raw.githubusercontent.com/msink/kotlin-libui/master/samples/hello/hello-windows.png?sanitize=false

Guess now the key is to understand the kotlin code. :)

If it works then perhaps it could be added towards control_gallery.rb ? Since the latter already
contains a LOT of demo-examples.

[kojix2]

Hi @rubyFeedback

I think LibUI.new_scrolling_area is to create an area with scroll bars. It is not a widget container.

• https://pkg.go.dev/github.com/andlabs/ui#NewScrollingArea

The kotlin example you gave is just a multiline_entry.

• https://github.com/msink/kotlin-libui/blob/2a9e8907dcaaa4a2c78b2a942facdb268c0e0c01/samples/hello/hello.c#L37
• https://pkg.go.dev/github.com/andlabs/ui#MultilineEntry

I think what you really want is Table or append/delete of hbox.

[kojix2]

In Ruby/Tk, you can use BWidget in this way.

require 'tk'
require 'tkextlib/bwidget'

root = TkRoot.new

sw = Tk::BWidget::ScrolledWindow.new(root)
sf = Tk::BWidget::ScrollableFrame.new(sw, constrainedwidth: true)
sw.set_widget(sf)
vf = sf.get_frame
vf.configure(bg: :white, borderwidth: 1, relief: :groove)

10.times do |i|
  TkButton.new(vf, text: "button #{i}").pack
  TkLabel.new(vf, text: "label #{i}").pack
end

sw.pack(fill: :both, expand: true)

Tk.mainloop

[kojix2]

andlabs/libui#178

[AndyObtiva]

I already provide an Ruby example of scrolling_area in Glimmer DSL for LibUI

(sorry, I didn't see this issue before as I was very busy with other stuff the last two months and had unwatched LibUI except for releases to keep myself focused on my tasks, but I just re-enabled full watching of LibUI to stay informed of issues in case I could help)

Code: https://github.com/AndyObtiva/glimmer-dsl-libui/blob/master/examples/basic_scrolling_area.rb

BTW, you can only control the scrolling programmatically on Mac, but not Windows and Linux (seems like a bug in C libui). But, you can still scroll the area manually on all platforms at least.

Otherwise, you cannot put anything in a scrolling area (like labels and buttons), yet only area content like path shapes. That said, by building area-based custom controls, you can then add your own (custom) flavors of label and button inside a scrolling area, and thus achieve your goal anyways.

If you need help in programming your app with scrolling_area, hit me up about it with an Issue request in Glimmer DSL for LibUI. I'd be happy to help you implement it.

Cheers!