Detect end of the html content offset

[asmith20002]

Is it possible to get the end offset of the content as shown below?

I'd like to be able to insert a widget at the red/yellow dot. That's a thing CSS float can do easily but since float is not supported, I'd like to know if there's a way we could detect that offset to calculate the remaining space to the end of the line.

[Sub6Resources]

As far as I'm aware, there isn't a simple way to get that offset without writing some sort of layout algorithm from scratch. Html uses the Text.rich widget under the hood to lay everything out, which relies heavily on the Flutter engine's text layout algorithms which are deeply baked into the Flutter ecosystem. Basically this means that if you can do it with a Text.rich widget, you can do it with the Html widget.

You could possibly do some sort of hack with rtl text and a WidgetSpan to achieve something like this, but if you are just trying to put a child widget on the right side of the Html widget, it would be a lot simpler just to use a Stack and place whatever widget you want to down in that bottom right corner.

Some more info about what you are trying to achieve could help us provide some better workarounds!

[asmith20002]

Stack doesn't work in this situation because sometimes there is not enough space and the "float-right" widget should go to the next line.

Here's my original question in StackOverflow: (the image in the first post describes the situation)
https://stackoverflow.com/questions/70802737/flutter-chat-text-align-like-whatsapp-or-telegram

The answers on that question are suggestions using a RenderBox and they are using TextPainter to paint the text and get its size. The problem is that those answers are assuming that I have plain text so the TextPainter is used to calculate the offset. I'm using Html() and I can't use the TextPainer to calculate the rendered Html.

Knowing the remaining space on the last line of Html is key to this problem.

if (space is enough)
{
// Use Stack()
}
else
{
// Use Wrap()
}

[Sub6Resources]

Ah, thank you for the StackOverflow link. I wasn't super familiar with TextPainter, so that code sample gave me some insight. I'll need to play around with it for a little while, but I might be able to get something that works. The trick is going to be getting the PlaceholderDimensions of Widgets within the Html. I'll probably have to get some inspiration from the RichText widget. I'll keep you posted!

[asmith20002]

I wasn't home. Sorry for the late reply.

This is great news. Can't wait to see some sort of solution. Thanks for the effort, :)

[asmith20002]

Just wanted to follow up. Did you manage to play around with RichText? Any progress?