Animating Widget Offset

[lllama]

The docs say that you can animate a Widget's offset (https://textual.textualize.io/guide/animation/#animating-styles) in order to move it around the screen.

At the moment, I'm only able to do this by creating a custom widget that wraps my desired widget, and then adding two reactive attributes (offset_x and offset_y). I then use the watch methods to change the actual offset using

def watch_offset_x(self, new_value):
    self.styles.offset = ScalarOffset(Scalar.from_number(new_value), self.styles.offset.y)

Is there some other way that I'm missing?

[willmcgugan]

I would expect modifying offset property to be enough. Sounds like a bug.

[lllama]

Ah! So the error message says animate needs an int, float or something with a blend method. Looks like there's an Offset type with one of those that I haven't tried...

[willmcgugan]

What were you setting offset to? Even if using an Offset works, I would like it to accept a tuple of numbers as well.

[lllama]

So I might have just tried with a float and then realised that I needed something like a tuple and assumed it was a gap in the docs so went down the reactive path. Just tried with a tuple and an Offset though, and neither work: tuple complains it's not an int, float, or blendable thing, and the Offset is okay as a final value but then it errors with a exception that the start_value needs to be a float. i.e. it's happy getting to an Offset but it doesn't like ScalarOffset as a start_value.

So I think that this is a bug/missing case.