Trait TextMeasurer 

pub trait TextMeasurer: 'static {
    // Required methods
    fn measure(&self, text: &AnnotatedString, style: &TextStyle) -> TextMetrics;
    fn get_offset_for_position(
        &self,
        text: &AnnotatedString,
        style: &TextStyle,
        x: f32,
        y: f32,
    ) -> usize;
    fn get_cursor_x_for_offset(
        &self,
        text: &AnnotatedString,
        style: &TextStyle,
        offset: usize,
    ) -> f32;
    fn layout(
        &self,
        text: &AnnotatedString,
        style: &TextStyle,
    ) -> TextLayoutResult;

    // Provided methods
    fn measure_for_node(
        &self,
        node_id: Option<usize>,
        text: &AnnotatedString,
        style: &TextStyle,
    ) -> TextMetrics { ... }
    fn measure_subsequence(
        &self,
        text: &AnnotatedString,
        range: Range<usize>,
        style: &TextStyle,
    ) -> TextMetrics { ... }
    fn measure_subsequence_for_node(
        &self,
        node_id: Option<usize>,
        text: &AnnotatedString,
        range: Range<usize>,
        style: &TextStyle,
    ) -> TextMetrics { ... }
    fn measure_line_prefix_widths(
        &self,
        text: &AnnotatedString,
        line_range: Range<usize>,
        style: &TextStyle,
    ) -> Option<TextLinePrefixWidths> { ... }
    fn measure_line_width(
        &self,
        text: &AnnotatedString,
        line_range: Range<usize>,
        style: &TextStyle,
    ) -> Option<f32> { ... }
    fn line_height(&self, text: &AnnotatedString, style: &TextStyle) -> f32 { ... }
    fn line_height_for_node(
        &self,
        node_id: Option<usize>,
        text: &AnnotatedString,
        style: &TextStyle,
    ) -> f32 { ... }
    fn choose_auto_hyphen_break(
        &self,
        _line: &str,
        _style: &TextStyle,
        _segment_start_char: usize,
        _measured_break_char: usize,
    ) -> Option<usize> { ... }
    fn measure_with_options(
        &self,
        text: &AnnotatedString,
        style: &TextStyle,
        options: TextLayoutOptions,
        max_width: Option<f32>,
    ) -> TextMetrics { ... }
    fn measure_with_options_for_node(
        &self,
        node_id: Option<usize>,
        text: &AnnotatedString,
        style: &TextStyle,
        options: TextLayoutOptions,
        max_width: Option<f32>,
    ) -> TextMetrics { ... }
    fn prepare_with_options(
        &self,
        text: &AnnotatedString,
        style: &TextStyle,
        options: TextLayoutOptions,
        max_width: Option<f32>,
    ) -> PreparedTextLayout { ... }
    fn prepare_with_options_for_node(
        &self,
        node_id: Option<usize>,
        text: &AnnotatedString,
        style: &TextStyle,
        options: TextLayoutOptions,
        max_width: Option<f32>,
    ) -> PreparedTextLayout { ... }
    fn prepare_with_options_fallback(
        &self,
        text: &AnnotatedString,
        style: &TextStyle,
        options: TextLayoutOptions,
        max_width: Option<f32>,
    ) -> PreparedTextLayout { ... }
}

Re-export the UI crate so applications can depend on a single crate.

Required Methods

fn measure(&self, text: &AnnotatedString, style: &TextStyle) -> TextMetrics

fn get_offset_for_position( &self, text: &AnnotatedString, style: &TextStyle, x: f32, y: f32, ) -> usize

fn get_cursor_x_for_offset( &self, text: &AnnotatedString, style: &TextStyle, offset: usize, ) -> f32

fn layout(&self, text: &AnnotatedString, style: &TextStyle) -> TextLayoutResult

Provided Methods

fn measure_for_node( &self, node_id: Option<usize>, text: &AnnotatedString, style: &TextStyle, ) -> TextMetrics

fn measure_subsequence( &self, text: &AnnotatedString, range: Range<usize>, style: &TextStyle, ) -> TextMetrics

fn measure_subsequence_for_node( &self, node_id: Option<usize>, text: &AnnotatedString, range: Range<usize>, style: &TextStyle, ) -> TextMetrics

fn measure_line_prefix_widths( &self, text: &AnnotatedString, line_range: Range<usize>, style: &TextStyle, ) -> Option<TextLinePrefixWidths>

fn measure_line_width( &self, text: &AnnotatedString, line_range: Range<usize>, style: &TextStyle, ) -> Option<f32>

fn line_height(&self, text: &AnnotatedString, style: &TextStyle) -> f32

fn line_height_for_node( &self, node_id: Option<usize>, text: &AnnotatedString, style: &TextStyle, ) -> f32

fn choose_auto_hyphen_break( &self, _line: &str, _style: &TextStyle, _segment_start_char: usize, _measured_break_char: usize, ) -> Option<usize>

Returns an alternate break boundary for Hyphens::Auto when a greedy break split lands in the middle of a word.

segment_start_char and measured_break_char are character-boundary indices in line (not byte offsets). Return None to delegate to fallback behavior.

fn measure_with_options( &self, text: &AnnotatedString, style: &TextStyle, options: TextLayoutOptions, max_width: Option<f32>, ) -> TextMetrics

fn measure_with_options_for_node( &self, node_id: Option<usize>, text: &AnnotatedString, style: &TextStyle, options: TextLayoutOptions, max_width: Option<f32>, ) -> TextMetrics

fn prepare_with_options( &self, text: &AnnotatedString, style: &TextStyle, options: TextLayoutOptions, max_width: Option<f32>, ) -> PreparedTextLayout

fn prepare_with_options_for_node( &self, node_id: Option<usize>, text: &AnnotatedString, style: &TextStyle, options: TextLayoutOptions, max_width: Option<f32>, ) -> PreparedTextLayout

fn prepare_with_options_fallback( &self, text: &AnnotatedString, style: &TextStyle, options: TextLayoutOptions, max_width: Option<f32>, ) -> PreparedTextLayout

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl TextMeasurer for SoftwareTextMeasurer

fn measure(&self, text: &AnnotatedString, style: &TextStyle) -> TextMetrics

fn measure_subsequence( &self, text: &AnnotatedString, range: Range<usize>, style: &TextStyle, ) -> TextMetrics

fn measure_line_prefix_widths( &self, text: &AnnotatedString, line_range: Range<usize>, style: &TextStyle, ) -> Option<TextLinePrefixWidths>

fn measure_line_width( &self, text: &AnnotatedString, line_range: Range<usize>, style: &TextStyle, ) -> Option<f32>

fn line_height(&self, text: &AnnotatedString, style: &TextStyle) -> f32

fn get_offset_for_position( &self, text: &AnnotatedString, style: &TextStyle, x: f32, y: f32, ) -> usize

fn get_cursor_x_for_offset( &self, text: &AnnotatedString, style: &TextStyle, offset: usize, ) -> f32

fn layout(&self, text: &AnnotatedString, style: &TextStyle) -> TextLayoutResult

fn choose_auto_hyphen_break( &self, line: &str, style: &TextStyle, segment_start_char: usize, measured_break_char: usize, ) -> Option<usize>

Implementors