Struct CompositionEventData 

pub struct CompositionEventData {
    pub data: String,
    pub cursor_begin: usize,
    pub cursor_end: usize,
    pub seat_id: u64,
}

Data carried by the three IME composition events.

Every desktop shell already runs a real IME client — Win32 WM_IME_* with candidate-window positioning, macOS NSTextInputClient, Wayland zwp_text_input_v3 preedit/commit, X11 XIM plus the xkb Compose layer — and all of it terminated in the engine’s text cache. The built-in text widgets therefore worked, but an app rendering its own composition (a code editor, a terminal, a chat box with inline candidates) had no way to see it, because the Composition* filters had no event to carry.

The shape is the intersection of what the platforms report, which is also what W3C CompositionEvent and Wayland preedit_string agree on.

Fields

data: String

The preedit (composition) text as it currently stands. Empty on CompositionStart, and on CompositionEnd this is the committed string — W3C defines compositionend.data as what was committed, not what was pending.

cursor_begin: usize

Byte offset of the selection/caret start within data. Wayland sends this directly (preedit_string(text, cursor_begin, cursor_end)); Win32 derives it from GCS_CURSORPOS; macOS from the selectedRange passed to setMarkedText:selectedRange:replacementRange:.

cursor_end: usize

Byte offset of the selection/caret end within data. Equal to cursor_begin for a collapsed caret.

seat_id: u64

The SEAT whose input method this is (9b-ii-a-i-d-ii-c-i); the primary is PRIMARY_POINTER_SEAT. The Focus filter delivers a seat’s composition to that seat’s focused node.

Trait Implementations

impl Clone for CompositionEventData

fn clone(&self) -> CompositionEventData

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CompositionEventData

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for CompositionEventData

impl PartialEq for CompositionEventData

fn eq(&self, other: &CompositionEventData) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for CompositionEventData