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widget,io,app: draw IME composition underline

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Track IME composition range updates as key.CompositionEvent and route them to
the focused editor. Draw a thin underline under the current composition range
using the editor text material.

Keep the composition range in imeState so it is reset with the rest of the
editor input method state, and normalize it in input.Router before forwarding
CompositionEvent.

Signed-off-by: qiannian <qianniancn@gmail.com>
This commit is contained in:
qiannian
2026-06-16 16:28:58 +08:00
committed by Chris Waldon
parent a8fe27488f
commit e4932e163e
4 changed files with 48 additions and 8 deletions
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io/input/router.go
+8 -1
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@@ -419,7 +419,7 @@ func (f *filter) Merge(f2 filter) {
func (f *filter) Matches(e event.Event) bool {
switch e.(type) {
case key.FocusEvent, key.SnippetEvent, key.EditEvent, key.SelectionEvent:
case key.FocusEvent, key.SnippetEvent, key.EditEvent, key.SelectionEvent, key.CompositionEvent:
return f.focusable
default:
return f.pointer.Matches(e)
@@ -463,6 +463,13 @@ func (q *Router) processEvent(e event.Event, system bool) {
evts = append(evts, taggedEvent{tag: f, event: e})
}
q.changeState(e, state, evts)
case key.CompositionEvent:
e = key.CompositionEvent(rangeNorm(key.Range(e)))
var evts []taggedEvent
if f := state.focus; f != nil {
evts = append(evts, taggedEvent{tag: f, event: e})
}
q.changeState(e, state, evts)
case key.EditEvent, key.FocusEvent, key.SelectionEvent:
var evts []taggedEvent
if f := state.focus; f != nil {