use ui::{    ActiveTheme as _, AnyElement, Button, ButtonCommon as _, ButtonSize, ButtonStyle,    Clickable as _, Context, ElementId, FluentBuilder as _, IntoElement as _, ParentElement as _,    SharedString, Styled as _, StyledTypography as _, Tooltip, div,}; use crate::{    CsvPreviewView,    settings::{FontType, RowIdentifiers},    types::{DataRow, DisplayRow, LineNumber},}; pub enum RowIdentDisplayMode {    /// E.g    /// ```text    /// 1    /// ...    /// 5    /// ```    Vertical,    /// E.g.    /// ```text    /// 1-5    /// ```    Horizontal,} impl LineNumber {    pub fn display_string(&self, mode: RowIdentDisplayMode) -> String {        match *self {            LineNumber::Line(line) => line.to_string(),            LineNumber::LineRange(start, end) => match mode {                RowIdentDisplayMode::Vertical => {                    if start + 1 == end {                        format!("{start}\n{end}")                    } else {                        format!("{start}\n...\n{end}")                    }                }                RowIdentDisplayMode::Horizontal => {                    format!("{start}-{end}")                }            },        }    }} impl CsvPreviewView {    /// Calculate the optimal width for the row identifier column (line numbers or row numbers).    ///    /// This ensures the column is wide enough to display the largest identifier comfortably,    /// but not wastefully wide for small files.    pub(crate) fn calculate_row_identifier_column_width(&self) -> f32 {        match self.settings.numbering_type {            RowIdentifiers::SrcLines => self.calculate_line_number_width(),            RowIdentifiers::RowNum => self.calculate_row_number_width(),        }    }     /// Calculate width needed for line numbers (can be multi-line)    fn calculate_line_number_width(&self) -> f32 {        // Find the maximum line number that could be displayed        let max_line_number = self            .engine            .contents            .line_numbers            .iter()            .map(|ln| match ln {                LineNumber::Line(n) => *n,                LineNumber::LineRange(_, end) => *end,            })            .max()            .unwrap_or_default();         let digit_count = if max_line_number == 0 {            1        } else {            (max_line_number as f32).log10().floor() as usize + 1        };         // if !self.settings.multiline_cells_enabled {        //     // Uses horizontal line numbers layout like `123-456`. Needs twice the size        //     digit_count *= 2;        // }         let char_width_px = 9.0; // TODO: get real width of the characters        let base_width = (digit_count as f32) * char_width_px;        let padding = 20.0;        let min_width = 60.0;        (base_width + padding).max(min_width)    }     /// Calculate width needed for sequential row numbers    fn calculate_row_number_width(&self) -> f32 {        let max_row_number = self.engine.contents.rows.len();         let digit_count = if max_row_number == 0 {            1        } else {            (max_row_number as f32).log10().floor() as usize + 1        };         let char_width_px = 9.0; // TODO: get real width of the characters        let base_width = (digit_count as f32) * char_width_px;        let padding = 20.0;        let min_width = 60.0;        (base_width + padding).max(min_width)    }     pub(crate) fn create_row_identifier_header(        &self,        cx: &mut Context<'_, CsvPreviewView>,    ) -> AnyElement {        // First column: row identifier (clickable to toggle between Lines and Rows)        let row_identifier_text = match self.settings.numbering_type {            RowIdentifiers::SrcLines => "Lines",            RowIdentifiers::RowNum => "Rows",        };         let view = cx.entity();        let value = div()            .map(|div| match self.settings.font_type {                FontType::Ui => div.font_ui(cx),                FontType::Monospace => div.font_buffer(cx),            })            .child(                Button::new(                    ElementId::Name("row-identifier-toggle".into()),                    row_identifier_text,                )                .style(ButtonStyle::Subtle)                .size(ButtonSize::Compact)                .tooltip(Tooltip::text(                    "Toggle between: file line numbers or sequential row numbers",                ))                .on_click(move |_event, _window, cx| {                    view.update(cx, |this, cx| {                        this.settings.numbering_type = match this.settings.numbering_type {                            RowIdentifiers::SrcLines => RowIdentifiers::RowNum,                            RowIdentifiers::RowNum => RowIdentifiers::SrcLines,                        };                        cx.notify();                    });                }),            )            .into_any_element();        value    }     pub(crate) fn create_row_identifier_cell(        &self,        display_row: DisplayRow,        data_row: DataRow,        cx: &Context<'_, CsvPreviewView>,    ) -> Option<AnyElement> {        let row_identifier: SharedString = match self.settings.numbering_type {            RowIdentifiers::SrcLines => self                .engine                .contents                .line_numbers                .get(*data_row)?                .display_string(if self.settings.multiline_cells_enabled {                    RowIdentDisplayMode::Vertical                } else {                    RowIdentDisplayMode::Horizontal                })                .into(),            RowIdentifiers::RowNum => (*display_row + 1).to_string().into(),        };         let value = div()            .flex()            .px_1()            .border_b_1()            .border_color(cx.theme().colors().border_variant)            .h_full()            .text_ui(cx)            // Row identifiers are always centered            .items_center()            .justify_end()            .map(|div| match self.settings.font_type {                FontType::Ui => div.font_ui(cx),                FontType::Monospace => div.font_buffer(cx),            })            .child(row_identifier)            .into_any_element();        Some(value)    }}