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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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12
crates/egui_demo_lib/src/demo/text_edit.rs
View File

@@ -53,9 +53,7 @@ impl super::View for TextEditDemo {
ui.spacing_mut().item_spacing.x = 0.0;
ui.label("Selected text: ");
if let Some(text_cursor_range) = output.cursor_range {
use egui::TextBuffer as _;
let selected_chars = text_cursor_range.as_sorted_char_range();
let selected_text = text.char_range(selected_chars);
let selected_text = text_cursor_range.slice_str(text);
ui.code(selected_text);
}
});
@@ -92,7 +90,9 @@ impl super::View for TextEditDemo {
let text_edit_id = output.response.id;
if let Some(mut state) = egui::TextEdit::load_state(ui.ctx(), text_edit_id) {
let ccursor = egui::text::CCursor::new(0);
state.set_ccursor_range(Some(egui::text::CCursorRange::one(ccursor)));
state
.cursor
.set_char_range(Some(egui::text::CCursorRange::one(ccursor)));
state.store(ui.ctx(), text_edit_id);
ui.ctx().memory_mut(|mem| mem.request_focus(text_edit_id)); // give focus back to the [`TextEdit`].
}
@@ -102,7 +102,9 @@ impl super::View for TextEditDemo {
let text_edit_id = output.response.id;
if let Some(mut state) = egui::TextEdit::load_state(ui.ctx(), text_edit_id) {
let ccursor = egui::text::CCursor::new(text.chars().count());
state.set_ccursor_range(Some(egui::text::CCursorRange::one(ccursor)));
state
.cursor
.set_char_range(Some(egui::text::CCursorRange::one(ccursor)));
state.store(ui.ctx(), text_edit_id);
ui.ctx().memory_mut(|mem| mem.request_focus(text_edit_id)); // give focus back to the [`TextEdit`].
}