Spell check for text fields?

[dolezvo1]

I was just wondering, is there any way for me to implement a spell check for text fields, i.e. colour underline of a text portion that is not valid by some criteria? I get that this is a complicated enough topic to warrant egui not bothering about it, but I don't think I found anything that could be used vaguely in this way on the TextEdit documentation page, so I'm curious if anyone has any thoughts on how to do something like that.

[YgorSouza]

It is possible to override how editable text is rendered via the layouter method. See for example https://www.egui.rs/#easymarkeditor. The source code is here:

egui/crates/egui_demo_lib/src/easy_mark/easy_mark_editor.rs

Lines 83 to 94 in 27e7303

	let mut layouter = |ui: &egui::Ui, easymark: &str, wrap_width: f32| {
	let mut layout_job = highlighter.highlight(ui.style(), easymark);
	layout_job.wrap.max_width = wrap_width;
	ui.fonts(|f| f.layout_job(layout_job))
	};
	ui.add(
	egui::TextEdit::multiline(code)
	.desired_width(f32::INFINITY)
	.font(egui::TextStyle::Monospace) // for cursor height
	.layouter(&mut layouter),
	)

You could use that to add spell checker underlines. Then to add interactivity (i.e., map the mouse position to a specific part of the text to display suggestions etc), I think you'd have to get the Galley -> Row -> Glyph and go through the glyphs to figure out which one is hovered, then get its layout_section to see what the spell checker error is, if any. Might have to model a type that allows caching all that so you don't recompute it every frame. I think it would be hard to add that generically to egui, since each use case would be different, unless egui implemented support for a standard like LSP or something like that. Could be an idea for a third-party crate, but I don't think one exists at the moment. The closest is egui_code_editor.

[dolezvo1]

That sounds great, I'll look into it, thank you!