UI text wrapping and `LineBreakOn` example

[ickshonpe]

Objective

An example demonstrating more text layout options, text wrapping and LineBreakOn.

Won't look exactly like this on main because of the remaining bugs in text.

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[ickshonpe]

Looks great? Do you have PRs open to fix the remaining text wrap bugs? Could you link them here?

I've got one big thing I'm just cleaning up now, it's a mess internally but the output looks great and, it seems to fix all the remaining text layout and wrapping issues. I'll put in a PR tonight or tomorrow morning. It will need more work and some other people's input though, as it makes quite a lot of changes I'm not sure about.

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[ickshonpe]

All looks good, pointed out a couple of typos that were freaking the CI. Should also have an entry in the examples/README.md. No text-wrapping behavior worked on my environment (Metal), but that's an Issue for another day.

The no text-wrapping is expected as text-wrapping isn't working correctly in bevy main atm. I made this originally as a test case for finding bugs in the text implementation.

[ickshonpe]

Looks great? Do you have PRs open to fix the remaining text wrap bugs? Could you link them here?

~~#7761~~ #7779

[alice-i-cecile]

I think you meant to link https://github.com/bevyengine/bevy/pull/7779 :)

[doup]

I'm not sure about this example:

• I like it as debugging example as it helps review that the node size is correct after the line breaks are applied; specially interesting when mixed with the Space* cases.
• But I don't like it for an user, as it mixes two concepts: text wrapping and flex layout.

Otherwise, it looks great. :-)

[ickshonpe]

I'm not sure about this example:

• I like it as debugging example as it helps review that the node size is correct after the line breaks are applied; specially interesting when mixed with the Space* cases.
• But I don't like it for an user, as it mixes two concepts: text wrapping and flex layout.

Otherwise, it looks great. :-)

Yep it's more of a debugging example, if you look at this in Bevy 0.9 it's a horrible mess. The space cases are especially important to get right.

Maybe there should be a separate examples section for debugging examples full of sanity checks and edge cases like this.

[alice-i-cecile]

Maybe there should be a separate examples section for debugging examples full of sanity checks and edge cases like this.

Yeah, stress_tests serves a similar role. torture_tests is probably a bit too off-color, but I'd support the creation of a similar folder, either specific to UI or in general.

[doup]

Maybe just append _debug to the example name and state it in the example description. Like text_debug does?

[ickshonpe]

Maybe just append _debug to the example name and state it in the example description. Like text_debug does?

Yep, I like that idea.

[ickshonpe]

Another important use case with this example is to make sure that the text systems respond correctly to window resizing, which is one of the places where the previous attempts to fix text wrapping tended to fail.

[doup]

I'm trying to tweak this example to use gap/padding for extra style points… but it breaks when width is not explicitly set. HTML/CSS correctly handles text overflow. Note that width is calculated from flex basis/shrink/grow.

I'm not sure if this is related to #7779; it might be a bug on its own.

Commit with gaps: https://github.com/doup/bevy/commit/fc0e0085c629b0caa18ad384dba9d0f3b92928aa

Current: col width < text width

With gap: col width > text width

Works fine 👏 (because text width is smaller than column width)

With gap: col width < text width

On window resize, text doesn't overflow. Column width should be smaller.

Sanity check with HTML/CSS

HTML example, text-overflow is handled correctly: https://gist.github.com/doup/78710118d8e54fd89b89d587798f6452

cc @nicoburns

[nicoburns]

@doup I think this might be due to overflow: hidden not being handled properly (indeed Taffy currently doesn't allow you to set overflow at all). I think the workaround at the moment would be to set min-width: 0 on the columns. But probably we ought to support overflow?

See https://github.com/w3c/csswg-drafts/issues/1865.

[doup]

I don't understand why, but min-width: 0 works. I've created an issue; we can follow there and stop spamming this PR. ^_^U

Btw, I've found another issue, new ticket created: https://github.com/bevyengine/bevy/issues/8017.

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