Constraining size based on other views

[electricbrass]

This is maybe a feature request, but more of just a question about using the library:
I have a fixed sized view here on the right, and a full with .full_width() on the left:

It works great. I can resize the window and the small column never gets wider, while the resizes to fit the screen.

...until something wider than the TextView gets appended

Then it grows until it takes the entire width of the screen before wrapping.

I can't figure out how I'm supposed to constrain it's size properly. AtMost and Fixed both require an actual value, which I haven't figured out a way to dynamically find. I tried adding a callback to Event::Refresh or Event::WindowResize than uses siv.screen_size().x and change the max_width of that view, but everything I've tried either results in the callbacks never running, or getting a screen width of 0.

I just want it to take up the entire screen minus the width of any fixed size views.

[gyscos]

Hi, and thanks for the report!

What is the type of the view wrapped in full_width? Is it a TextView? If not, how does it implement View::required_size?

The LinearLayout currently works like this:

• Offer each view the entire size, see how much they take. In your case, the left view will ask for everything, the right view for its fixed size.
• If the sum exceeds the available space (like in this case), offer each view a tiny space only 1-cell wide. That's the minimum size of each view.
• It then tries to find a balance between the two by sharing the available space.

The problem might happen if the left view reports a very large minimal size. TextView should be adaptable, and will never exceed the requested width. But if it's a custom view, or a view with other size requirements, it might request too much, not leaving any for the right view.

[electricbrass]

It's a vertical LinearLayout. It's 2 children are Panels. The top panel is indeed just wrapping a TextView. It's that TextView that's growing too large. The bottom Panel has a fixed-size TextView and an EditView.

[electricbrass]

https://github.com/electricbrass/odarcon/blob/6dbb45d93705a31371cf5a5e73722681b8caa0f6/src/main.rs#L502-L603

This is the relevant code