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winit-core: add Ime::DeleteSurroundingText API

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This completes the basic API required for e.g. Wayland.
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DorotaC 2025-08-02 12:17:27 +02:00 • committed by GitHub
parent 120f21a010
commit d7fdfb1bca
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4 changed files with 81 additions and 5 deletions
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22
examples/application.rs
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@ -9,7 +9,7 @@ use std::sync::mpsc::{self, Receiver, Sender};
use std::sync::Arc;
#[cfg(all(not(android_platform), not(web_platform)))]
use std::time::Instant;
use std::{fmt, mem};
use std::{cmp, fmt, mem};
use ::tracing::{error, info};
use cursor_icon::CursorIcon;
@ -525,6 +525,26 @@ impl ApplicationHandler for Application {
let request_data = window.get_ime_update();
window.window.request_ime_update(ImeRequest::Update(request_data)).unwrap();
},
Ime::DeleteSurrounding { before_bytes, after_bytes } => {
let (text, cursor) = &window.text_field_contents;
// To anyone copying this, keep in mind that this doesn't take text selection
// into account. The deletion happens *around* the pre-edit,
// and may remove the whole selection or a part of it.
let delete_start = cursor.saturating_sub(before_bytes);
let delete_end = cmp::min(cursor.saturating_add(after_bytes), text.len());
if text.is_char_boundary(delete_start) && text.is_char_boundary(delete_end) {
let new_text = {
let mut t = String::from(&text[..delete_start]);
t.push_str(&text[delete_end..]);
t
};
window.text_field_contents = (new_text, delete_start);
info!("IME deleted bytes: {before_bytes}, {after_bytes}");
} else {
error!("Buggy IME tried to delete with indices not on char boundary.");
}
},
Ime::Disabled => info!("IME disabled for Window={window_id:?}"),
},
WindowEvent::PinchGesture { delta, .. } => {