use std::cmp; use crate::InlineCompletion;use gpui::{    point, prelude::*, quad, size, AnyElement, App, Bounds, Corners, Edges, HighlightStyle, Hsla,    StyledText, TextLayout, TextStyle,};use language::OffsetRangeExt;use settings::Settings;use theme::ThemeSettings;use ui::prelude::*; pub struct CompletionDiffElement {    element: AnyElement,    text_layout: TextLayout,    cursor_offset: usize,} impl CompletionDiffElement {    pub fn new(completion: &InlineCompletion, cx: &App) -> Self {        let mut diff = completion            .snapshot            .text_for_range(completion.excerpt_range.clone())            .collect::<String>();         let mut cursor_offset_in_diff = None;        let mut delta = 0;        let mut diff_highlights = Vec::new();        for (old_range, new_text) in completion.edits.iter() {            let old_range = old_range.to_offset(&completion.snapshot);             if cursor_offset_in_diff.is_none() && completion.cursor_offset <= old_range.end {                cursor_offset_in_diff =                    Some(completion.cursor_offset - completion.excerpt_range.start + delta);            }             let old_start_in_diff = old_range.start - completion.excerpt_range.start + delta;            let old_end_in_diff = old_range.end - completion.excerpt_range.start + delta;            if old_start_in_diff < old_end_in_diff {                diff_highlights.push((                    old_start_in_diff..old_end_in_diff,                    HighlightStyle {                        background_color: Some(cx.theme().status().deleted_background),                        strikethrough: Some(gpui::StrikethroughStyle {                            thickness: px(1.),                            color: Some(cx.theme().colors().text_muted),                        }),                        ..Default::default()                    },                ));            }             if !new_text.is_empty() {                diff.insert_str(old_end_in_diff, new_text);                diff_highlights.push((                    old_end_in_diff..old_end_in_diff + new_text.len(),                    HighlightStyle {                        background_color: Some(cx.theme().status().created_background),                        ..Default::default()                    },                ));                delta += new_text.len();            }        }         let cursor_offset_in_diff = cursor_offset_in_diff            .unwrap_or_else(|| completion.cursor_offset - completion.excerpt_range.start + delta);         let settings = ThemeSettings::get_global(cx).clone();        let text_style = TextStyle {            color: cx.theme().colors().editor_foreground,            font_size: settings.buffer_font_size(cx).into(),            font_family: settings.buffer_font.family,            font_features: settings.buffer_font.features,            font_fallbacks: settings.buffer_font.fallbacks,            line_height: relative(settings.buffer_line_height.value()),            font_weight: settings.buffer_font.weight,            font_style: settings.buffer_font.style,            ..Default::default()        };        let element = StyledText::new(diff).with_default_highlights(&text_style, diff_highlights);        let text_layout = element.layout().clone();         CompletionDiffElement {            element: element.into_any_element(),            text_layout,            cursor_offset: cursor_offset_in_diff,        }    }} impl IntoElement for CompletionDiffElement {    type Element = Self;     fn into_element(self) -> Self {        self    }} impl Element for CompletionDiffElement {    type RequestLayoutState = ();    type PrepaintState = ();     fn id(&self) -> Option<ElementId> {        None    }     fn request_layout(        &mut self,        _id: Option<&gpui::GlobalElementId>,        window: &mut Window,        cx: &mut App,    ) -> (gpui::LayoutId, Self::RequestLayoutState) {        (self.element.request_layout(window, cx), ())    }     fn prepaint(        &mut self,        _id: Option<&gpui::GlobalElementId>,        _bounds: gpui::Bounds<Pixels>,        _request_layout: &mut Self::RequestLayoutState,        window: &mut Window,        cx: &mut App,    ) -> Self::PrepaintState {        self.element.prepaint(window, cx);    }     fn paint(        &mut self,        _id: Option<&gpui::GlobalElementId>,        _bounds: gpui::Bounds<Pixels>,        _request_layout: &mut Self::RequestLayoutState,        _prepaint: &mut Self::PrepaintState,        window: &mut Window,        cx: &mut App,    ) {        if let Some(position) = self.text_layout.position_for_index(self.cursor_offset) {            let bounds = self.text_layout.bounds();            let line_height = self.text_layout.line_height();            let line_width = self                .text_layout                .line_layout_for_index(self.cursor_offset)                .map_or(bounds.size.width, |layout| layout.width());            window.paint_quad(quad(                Bounds::new(                    point(bounds.origin.x, position.y),                    size(cmp::max(bounds.size.width, line_width), line_height),                ),                Corners::default(),                cx.theme().colors().editor_active_line_background,                Edges::default(),                Hsla::transparent_black(),            ));            self.element.paint(window, cx);            window.paint_quad(quad(                Bounds::new(position, size(px(2.), line_height)),                Corners::default(),                cx.theme().players().local().cursor,                Edges::default(),                Hsla::transparent_black(),            ));        }    }}