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Handle the IME event first in TextEdit to fix some bugs #4794

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Merged
merged 2 commits into from
Jul 7, 2024
Merged

Handle the IME event first in TextEdit to fix some bugs #4794

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c184b28
Update builder.rs
rustbasic Jul 6, 2024
336196c
Update builder.rs
rustbasic Jul 7, 2024
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30 changes: 29 additions & 1 deletion crates/egui/src/widgets/text_edit/builder.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -855,7 +855,14 @@ fn events(

let mut any_change = false;

let events = ui.input(|i| i.filtered_events(&event_filter));
let mut events = ui.input(|i| i.filtered_events(&event_filter));

if state.ime_enabled {
remove_ime_incompatible_events(&mut events);
// Process IME events first:
events.sort_by_key(|e| !matches!(e, Event::Ime(_)));
}

for event in &events {
let did_mutate_text = match event {
// First handle events that only changes the selection cursor, not the text:
Expand Down Expand Up @@ -1055,6 +1062,27 @@ fn events(

// ----------------------------------------------------------------------------

fn remove_ime_incompatible_events(events: &mut Vec<Event>) {
// Remove key events which cause problems while 'IME' is being used.
// See https://github.com/emilk/egui/pull/4509
events.retain(|event| {
!matches!(
event,
Event::Key { repeat: true, .. }
| Event::Key {
key: Key::Backspace
| Key::ArrowUp
| Key::ArrowDown
| Key::ArrowLeft
| Key::ArrowRight,
..
}
)
});
}

// ----------------------------------------------------------------------------

/// Returns `Some(new_cursor)` if we did mutate `text`.
fn check_for_mutating_key_press(
os: OperatingSystem,
Expand Down