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Selectable text in Labels (#3814)

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* Closes https://github.com/emilk/egui/issues/3804

Add ability to select the text in labels with mouse-drag, double-click,
and keyboard (once clicked).
Hit Cmd+C to copy the text. If everything of a label with elided text is
selected, the copy command will copy the full non-elided text. IME and
accesskit _should_ work, but is untested.

You can control wether or not text in labels is selected globally in
`style.interaction.selectable_labels` or on a per-label basis in
`Label::selectable`. The default is ON.

This also cleans up the `TextEdit` code somewhat, fixing a couple
smaller bugs along the way.

This does _not_ implement selecting text across multiple widgets. Text
selection is only supported within a single `Label`, `TextEdit`, `Link`
or `Hyperlink`.


![label-text-selection](https://github.com/emilk/egui/assets/1148717/c161e819-50da-4b97-9686-042e6abf3564)


## TODO
* [x] Test
This commit is contained in:
Emil Ernerfeldt
2024-01-14 15:17:55 +01:00
committed by GitHub
parent 301c72ba22
commit 5d2e192927
18 changed files with 1031 additions and 632 deletions
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scripts/check.sh
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@@ -10,7 +10,7 @@ set -x
# Basically does what the CI does.
cargo install --quiet cargo-cranky # Uses lints defined in Cranky.toml. See https://github.com/ericseppanen/cargo-cranky
cargo install --quiet typos-cli
cargo +1.75.0 install --quiet typos-cli
# web_sys_unstable_apis is required to enable the web_sys clipboard API which eframe web uses,
# as well as by the wasm32-backend of the wgpu crate.