Implement IME primitives for PlainEditor. #136
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| #[derive(Clone, Default)] | ||
| struct ComposeState { | ||
| selection: Option<(usize, usize)>, | ||
| text: Arc<str>, |
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I feel like this should be a String. Then:
- We could mutate it and re-use the allocation when updating the pre-edit
- Setting it to empty would be allocation free
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- Setting it to empty would be allocation free
it may not matter, but it's never empty
examples/vello_editor/src/text.rs
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| // Winit on some platforms delivers an empty Preedit after Commit | ||
| // so don't lock into compose when preedit is empty. | ||
| Ime::Preedit(text, None) if text.is_empty() => vec
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parley/src/layout/editor.rs
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| CommitCompose => { | ||
| if let Some(ComposeState { text, .. }) = self.compose.clone() { | ||
| let new_insert = self.selection.insertion_index() + text.len(); | ||
| self.selection = if new_insert == self.buffer.len() { | ||
| Selection::from_index( | ||
| &self.layout, | ||
| new_insert.saturating_sub(1), | ||
| Affinity::Upstream, | ||
| ) | ||
| } else { | ||
| Selection::from_index(&self.layout, new_insert, Affinity::Downstream) | ||
| }; | ||
| } | ||
| self.compose = None; | ||
| layout_after = true; | ||
| } |
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It may not matter too much, but this does some additional work on each commit, as Winit delivers a Preedit("", None) before sending Commit. On commit, vello_editor in this PR currently clears the compose state, to immediately set it again, to then commit it. If CommitCompose takes the committed text, some of those buffer operations become unnecessary.
There also appear to be some IMEs that commit without going into compose first, so perhaps it makes sense to have SetCompose(Arc<str>, Option<(usize, usize)>), ClearCompose, and Commit(Arc<str>).
Commit(Arc<str>) would guarantee it also clears the compose state. Otherwise it's effectively the same as InsertOrReplaceSelection(Arc<str>).
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I agree, that will be the final command set as it has been requested by both you and Nico, and it clearly makes sense.
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