Trait InputHandler 

pub trait InputHandler: 'static {
    // Required methods
    fn selected_text_range(
        &mut self,
        ignore_disabled_input: bool,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<UTF16Selection>;
    fn marked_text_range(
        &mut self,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<Range<usize>>;
    fn text_for_range(
        &mut self,
        range_utf16: Range<usize>,
        adjusted_range: &mut Option<Range<usize>>,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<String>;
    fn replace_text_in_range(
        &mut self,
        replacement_range: Option<Range<usize>>,
        text: &str,
        window: &mut Window,
        cx: &mut App,
    );
    fn replace_and_mark_text_in_range(
        &mut self,
        range_utf16: Option<Range<usize>>,
        new_text: &str,
        new_selected_range: Option<Range<usize>>,
        window: &mut Window,
        cx: &mut App,
    );
    fn unmark_text(&mut self, window: &mut Window, cx: &mut App);
    fn bounds_for_range(
        &mut self,
        range_utf16: Range<usize>,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<Bounds<Pixels>>;
    fn character_index_for_point(
        &mut self,
        point: Point<Pixels>,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<usize>;

    // Provided methods
    fn paste(&mut self, item: ClipboardItem, window: &mut Window, cx: &mut App) { ... }
    fn set_selected_text_range(
        &mut self,
        _range_utf16: Range<usize>,
        _window: &mut Window,
        _cx: &mut App,
    ) { ... }
    fn element_bounds(
        &mut self,
        _window: &mut Window,
        _cx: &mut App,
    ) -> Option<Bounds<Pixels>> { ... }
    fn text_length_utf16(
        &mut self,
        _window: &mut Window,
        _cx: &mut App,
    ) -> Option<usize> { ... }
    fn apple_press_and_hold_enabled(&mut self) -> bool { ... }
    fn accepts_text_input(
        &mut self,
        _window: &mut Window,
        _cx: &mut App,
    ) -> bool { ... }
    fn text_input_editable_range(
        &mut self,
        _window: &mut Window,
        _cx: &mut App,
    ) -> Option<Range<usize>> { ... }
    fn prefers_ime_for_printable_keys(
        &mut self,
        _window: &mut Window,
        _cx: &mut App,
    ) -> bool { ... }
    fn text_input_configuration(
        &mut self,
        _window: &mut Window,
        _cx: &mut App,
    ) -> TextInputConfiguration { ... }
}

Zed’s interface for handling text input from the platform’s IME system This is currently a 1:1 exposure of the NSTextInputClient API:

https://developer.apple.com/documentation/appkit/nstextinputclient

Required Methods

fn selected_text_range( &mut self, ignore_disabled_input: bool, window: &mut Window, cx: &mut App, ) -> Option<UTF16Selection>

Get the range of the user’s currently selected text, if any Corresponds to selectedRange()

Return value is in terms of UTF-16 characters, from 0 to the length of the document

fn marked_text_range( &mut self, window: &mut Window, cx: &mut App, ) -> Option<Range<usize>>

Get the range of the currently marked text, if any Corresponds to markedRange()

Return value is in terms of UTF-16 characters, from 0 to the length of the document

fn text_for_range( &mut self, range_utf16: Range<usize>, adjusted_range: &mut Option<Range<usize>>, window: &mut Window, cx: &mut App, ) -> Option<String>

Get the text for the given document range in UTF-16 characters Corresponds to attributedSubstring(forProposedRange: actualRange:)

range_utf16 is in terms of UTF-16 characters

fn replace_text_in_range( &mut self, replacement_range: Option<Range<usize>>, text: &str, window: &mut Window, cx: &mut App, )

Replace the text in the given document range with the given text Corresponds to insertText(_:replacementRange:)

replacement_range is in terms of UTF-16 characters

fn replace_and_mark_text_in_range( &mut self, range_utf16: Option<Range<usize>>, new_text: &str, new_selected_range: Option<Range<usize>>, window: &mut Window, cx: &mut App, )

Replace the text in the given document range with the given text, and mark the given text as part of an IME ‘composing’ state Corresponds to setMarkedText(_:selectedRange:replacementRange:)

range_utf16 is in terms of UTF-16 characters new_selected_range is in terms of UTF-16 characters

fn unmark_text(&mut self, window: &mut Window, cx: &mut App)

Remove the IME ‘composing’ state from the document Corresponds to unmarkText()

fn bounds_for_range( &mut self, range_utf16: Range<usize>, window: &mut Window, cx: &mut App, ) -> Option<Bounds<Pixels>>

Get the bounds of the given document range in screen coordinates Corresponds to firstRect(forCharacterRange:actualRange:)

This is used for positioning the IME candidate window

fn character_index_for_point( &mut self, point: Point<Pixels>, window: &mut Window, cx: &mut App, ) -> Option<usize>

Get the character offset for the given point in terms of UTF16 characters

Corresponds to characterIndexForPoint:

Provided Methods

fn paste(&mut self, item: ClipboardItem, window: &mut Window, cx: &mut App)

Insert a platform-initiated paste at the current selection.

Platforms that deliver paste as an input event rather than through an application-defined action (e.g. the DOM paste event on web) call this with the full clipboard contents. The default implementation inserts only the plain-text portion of the item.

fn set_selected_text_range( &mut self, _range_utf16: Range<usize>, _window: &mut Window, _cx: &mut App, )

Set the range of the user’s currently selected text.

This is the reverse data-flow direction from Self::selected_text_range: platforms call it when the system text machinery moves the selection on the application’s behalf — e.g. the user drags a system selection handle or invokes Select All from system UI (iOS UITextInput setSelectedTextRange:, Android InputConnection.setSelection).

range_utf16 is in terms of UTF-16 characters, from 0 to the length of the document

fn element_bounds( &mut self, _window: &mut Window, _cx: &mut App, ) -> Option<Bounds<Pixels>>

Get the bounds of the focused text element in window coordinates, if known.

This is the pull counterpart to the PlatformWindow::update_ime_position push: mobile platforms ask for the focused element’s geometry when they need it (e.g. to frame system text-interaction UI overlaid on the focused element).

fn text_length_utf16( &mut self, _window: &mut Window, _cx: &mut App, ) -> Option<usize>

Get the length of the document in UTF-16 characters, if known.

fn apple_press_and_hold_enabled(&mut self) -> bool

Allows a given input context to opt into getting raw key repeats instead of sending these to the platform. TODO: Ideally we should be able to set ApplePressAndHoldEnabled in NSUserDefaults (which is how iTerm does it) but it doesn’t seem to work for me.

fn accepts_text_input(&mut self, _window: &mut Window, _cx: &mut App) -> bool

Returns whether this handler is accepting text input to be inserted.

fn text_input_editable_range( &mut self, _window: &mut Window, _cx: &mut App, ) -> Option<Range<usize>>

The contiguous range of text, in UTF-16 code units, that platform text input may read and edit around the current selection.

Platforms that mirror document text into an IME-editable buffer clamp the mirrored window to this range, so multi-step IME edit gestures (word deletion, autocorrect rewrites, suggestion picks) cannot reach content outside it. The range should contain the current selection; when it cannot (a selection spanning a region boundary), platforms degrade the mirrored IME context rather than widening the range. None places no bound.

fn prefers_ime_for_printable_keys( &mut self, _window: &mut Window, _cx: &mut App, ) -> bool

Returns whether printable keys should be routed to the IME before keybinding matching when a non-ASCII input source (e.g. Japanese, Korean, Chinese IME) is active. This prevents multi-stroke keybindings like jj from intercepting keys that the IME should compose.

Defaults to false. The editor overrides this based on whether it expects character input (e.g. Vim insert mode returns true, normal mode returns false). The terminal keeps the default false so that raw keys reach the terminal process.

fn text_input_configuration( &mut self, _window: &mut Window, _cx: &mut App, ) -> TextInputConfiguration

Get this handler’s preferences for platform text assistance.

GPUI re-queries this every frame and forwards it to the platform window only when it changes, so implementations must be cheap and may vary the result with application state (e.g. with the cursor’s position).

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl<V> InputHandler for ElementInputHandler<V>

where V: EntityInputHandler,