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text: truncate multi-paragraph text correctly

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This commit fixes a subtle problem when trunating text widgets that contain
multiple newline-delimited paragraphs.

Paragraphs are the unit of text shaping, so we divide the text into paragraphs
and then iterate those paragraphs performing shaping and line wrapping. If we
have a maximum number of lines to fill, we stop iterating paragraphs when we
use all of the available lines. Usually, if we fill all of the lines the text
shaper will insert the truncator symbol. However, if we exactly fill all of the
lines with the end of a paragraph, the line wrapper is able to fill the line
quota without actually truncating any of the text in that paragraph. Thus it
doesn't insert a truncator even though subsequent paragraphs were truncated (it
has no way to know).

To fix this, I've taught the line wrapper about an explicit scenario in which
we always want to show the truncator symbol *if* we hit the line limit, even if
all of the text in the current paragraph fit. I've then plumbed support for
that through our text stack.

Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
This commit is contained in:
Chris Waldon
2023-03-28 13:53:29 -04:00
committed by Elias Naur
parent 7e8c10927b
commit d71f170c29
6 changed files with 100 additions and 14 deletions
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go.mod
+1 -1
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@@ -6,7 +6,7 @@ require (
eliasnaur.com/font v0.0.0-20230308162249-dd43949cb42d
gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2
gioui.org/shader v1.0.6
github.com/go-text/typesetting v0.0.0-20230327141846-b6333f70ed72
github.com/go-text/typesetting v0.0.0-20230329143336-a38d00edd832
golang.org/x/exp v0.0.0-20221012211006-4de253d81b95
golang.org/x/exp/shiny v0.0.0-20220827204233-334a2380cb91
golang.org/x/image v0.5.0