ConstraintLayout with Barriers; How to constraint to bottom / top of barrier depending on size

Question

I am trying out the new Barrier feature in the 1.1.0-beta1. It works as expected however there is this use-case I cant seem to figure or (or is possible ConstraintLayout at

Answer 1

@Cheticamp 's answer is great, but he doesn't explain how he came up that idea.

Here is how I came up another solution inspired by his solution.

What we want to achieve is to put the button as high as possible, but it should be constrained to two limits:

1. button.bottom >= image.bottom

2. button.top >= text.bottom

We can use Barrier to satisfy these two requirements, but we need to modify one of them, I choose to modify the second one:

button.top >= text.bottom <=> button.bottom >= text.bottom + button.height

Now we have these two constraints:

1. button.bottom >= image.bottom

2. button.bottom >= text.bottom + button.height

Now we can place a fake button below the TextView like this: