lib.rs

#![allow(clippy::type_complexity)]

use std::{collections::VecDeque, path::PathBuf, time::Duration};
#[path = "utils.rs"]
pub mod utils;
pub use utils::*;

use bevy::{
    asset::HandleId,
    input::mouse::{MouseScrollUnit, MouseWheel},
    prelude::*,
    render::{render_resource::Extent3d, texture::DEFAULT_IMAGE_HANDLE},
    ui::FocusPolicy,
    window::{PrimaryWindow, WindowScaleFactorChanged},
};
pub use cosmic_text::{
    Action, Attrs, AttrsOwned, Color as CosmicColor, Cursor, Edit, Family, Style as FontStyle,
    Weight as FontWeight,
};
use cosmic_text::{
    AttrsList, Buffer, BufferLine, Editor, FontSystem, Metrics, Shaping, SwashCache,
};
use image::{imageops::FilterType, GenericImageView};

#[derive(Clone, Component, PartialEq)]
pub enum CosmicText {
    OneStyle(String),
    MultiStyle(Vec<Vec<(String, AttrsOwned)>>),
}

impl Default for CosmicText {
    fn default() -> Self {
        Self::OneStyle(String::new())
    }
}

/// Enum representing the position of the cosmic text.
#[derive(Clone, Component, Default)]
pub enum CosmicTextPosition {
    #[default]
    Center,
    TopLeft,
}

// TODO docs
#[derive(Clone, Component)]
pub struct CosmicMetrics {
    pub font_size: f32,
    pub line_height: f32,
    pub scale_factor: f32,
}

impl Default for CosmicMetrics {
    fn default() -> Self {
        Self {
            font_size: 12.,
            line_height: 12.,
            scale_factor: 1.,
        }
    }
}

#[derive(Resource)]
pub struct CosmicFontSystem(pub FontSystem);

#[derive(Component)]
pub struct ReadOnly; // tag component

#[derive(Component)]
pub struct CosmicEditor(pub Editor);

impl CosmicEditor {
    fn set_text(
        &mut self,
        text: CosmicText,
        attrs: AttrsOwned,
        font_system: &mut FontSystem,
    ) -> &mut Self {
        // TODO invoke trim_text here
        let editor = &mut self.0;
        editor.buffer_mut().lines.clear();
        match text {
            CosmicText::OneStyle(text) => {
                editor.buffer_mut().set_text(
                    font_system,
                    text.as_str(),
                    attrs.as_attrs(),
                    Shaping::Advanced,
                );
            }
            CosmicText::MultiStyle(lines) => {
                for line in lines {
                    let mut line_text = String::new();
                    let mut attrs_list = AttrsList::new(attrs.as_attrs());
                    for (text, attrs) in line.iter() {
                        let start = line_text.len();
                        line_text.push_str(text);
                        let end = line_text.len();
                        attrs_list.add_span(start..end, attrs.as_attrs());
                    }
                    editor.buffer_mut().lines.push(BufferLine::new(
                        line_text,
                        attrs_list,
                        Shaping::Advanced,
                    ));
                }
            }
        }
        self
    }

    /// Retrieves the cosmic text content from an editor.
    ///
    /// # Arguments
    ///
    /// * none, takes the rust magic ref to self
    ///
    /// # Returns
    ///
    /// A `String` containing the cosmic text content.
    pub fn get_text(&self) -> String {
        let buffer = self.0.buffer();
        let mut text = String::new();
        let line_count = buffer.lines.len();

        for (i, line) in buffer.lines.iter().enumerate() {
            text.push_str(line.text());

            if i < line_count - 1 {
                text.push('\n');
            }
        }

        text
    }
}

/// Adds the font system to each editor when added
fn cosmic_editor_builder(
    mut added_editors: Query<
        (
            Entity,
            &mut CosmicText,
            &CosmicAttrs,
            &CosmicMetrics,
            &CosmicMaxChars,
            &CosmicMaxLines,
            Option<&ReadOnly>,
            Option<&Node>,
            Option<&Sprite>,
        ),
        Added<CosmicText>,
    >,
    mut font_system: ResMut<CosmicFontSystem>,
    mut commands: Commands,
) {
    for (entity, text, attrs, metrics, max_chars, max_lines, readonly, node, sprite) in
        added_editors.iter_mut()
    {
        let mut editor = Editor::new(Buffer::new(
            &mut font_system.0,
            Metrics::new(metrics.font_size, metrics.line_height).scale(metrics.scale_factor),
        ));

        if let Some(node) = node {
            editor
                .buffer_mut()
                .set_size(&mut font_system.0, node.size().x, node.size().y)
        }

        if let Some(sprite) = sprite {
            if let Some(size) = sprite.custom_size {
                editor
                    .buffer_mut()
                    .set_size(&mut font_system.0, size.x, size.y)
            }
        }

        // hide cursor on readonly buffers
        // TODO do this seperately, allow for readonly to be toggled
        let mut cursor = editor.cursor();
        if readonly.is_some() {
            cursor.color = Some(cosmic_text::Color::rgba(0, 0, 0, 0));
        }
        editor.set_cursor(cursor);

        let mut editor_component = CosmicEditor(editor);

        let text = trim_text(text.to_owned(), max_chars.0, max_lines.0);
        editor_component.set_text(text, attrs.0.clone(), &mut font_system.0);

        commands.entity(entity).insert(editor_component);

        // Add edit history
        commands.entity(entity).insert(CosmicEditHistory::default());
    }
}

/// Updates editor buffer when text component changes
fn update_buffer_text(
    mut editor_q: Query<
        (
            &mut CosmicEditor,
            &mut CosmicText,
            &CosmicAttrs,
            &CosmicMaxChars,
            &CosmicMaxLines,
        ),
        Changed<CosmicText>,
    >,
    mut font_system: ResMut<CosmicFontSystem>,
) {
    for (mut editor, text, attrs, max_chars, max_lines) in editor_q.iter_mut() {
        let text = trim_text(text.to_owned(), max_chars.0, max_lines.0);
        editor.set_text(text, attrs.0.clone(), &mut font_system.0);
    }
}

#[derive(Component)]
pub struct CosmicAttrs(pub AttrsOwned);

impl Default for CosmicAttrs {
    fn default() -> Self {
        CosmicAttrs(AttrsOwned::new(Attrs::new()))
    }
}

#[derive(Component, Default)]
pub struct CosmicBackground(pub Option<Handle<Image>>);

#[derive(Component, Default)]
pub struct CosmicMaxLines(pub usize);

#[derive(Component, Default)]
pub struct CosmicMaxChars(pub usize);

#[derive(Bundle)]
pub struct CosmicEditUiBundle {
    // Bevy UI bits
    /// Describes the logical size of the node
    pub node: Node,
    /// Marker component that signals this node is a button
    pub button: Button,
    /// Styles which control the layout (size and position) of the node and it's children
    /// In some cases these styles also affect how the node drawn/painted.
    pub style: Style,
    /// Describes whether and how the button has been interacted with by the input
    pub interaction: Interaction,
    /// Whether this node should block interaction with lower nodes
    pub focus_policy: FocusPolicy,
    /// The background color, which serves as a "fill" for this node
    pub background_color: BackgroundColor,
    /// The color of the Node's border
    pub border_color: BorderColor,
    /// This is used as the cosmic text canvas
    pub image: UiImage,
    /// The transform of the node
    ///
    /// This field is automatically managed by the UI layout system.
    /// To alter the position of the `NodeBundle`, use the properties of the [`Style`] component.
    pub transform: Transform,
    /// The global transform of the node
    ///
    /// This field is automatically managed by the UI layout system.
    /// To alter the position of the `NodeBundle`, use the properties of the [`Style`] component.
    pub global_transform: GlobalTransform,
    /// Describes the visibility properties of the node
    pub visibility: Visibility,
    /// Algorithmically-computed indication of whether an entity is visible and should be extracted for rendering
    pub computed_visibility: ComputedVisibility,
    /// Indicates the depth at which the node should appear in the UI
    pub z_index: ZIndex,
    // cosmic bits
    /// text positioning enum
    pub text_position: CosmicTextPosition,
    /// text metrics
    pub cosmic_metrics: CosmicMetrics,
    /// text attributes
    pub cosmic_attrs: CosmicAttrs,
    /// bg img
    pub background_image: CosmicBackground,
    /// How many lines are allowed in buffer, 0 for no limit
    pub max_lines: CosmicMaxLines,
    /// How many characters are allowed in buffer, 0 for no limit
    pub max_chars: CosmicMaxChars,
    /// Setting this will update the buffer's text
    pub text: CosmicText,
}

impl Default for CosmicEditUiBundle {
    fn default() -> Self {
        Self {
            focus_policy: FocusPolicy::Block,
            node: Default::default(),
            button: Default::default(),
            style: Default::default(),
            border_color: BorderColor(Color::NONE),
            interaction: Default::default(),
            background_color: Default::default(),
            image: Default::default(),
            transform: Default::default(),
            global_transform: Default::default(),
            visibility: Default::default(),
            computed_visibility: Default::default(),
            z_index: Default::default(),
            text_position: Default::default(),
            cosmic_metrics: Default::default(),
            cosmic_attrs: Default::default(),
            background_image: Default::default(),
            max_lines: Default::default(),
            max_chars: Default::default(),
            text: Default::default(),
        }
    }
}

#[derive(Bundle)]
pub struct CosmicEditSpriteBundle {
    // Bevy Sprite Bits
    pub sprite: Sprite,
    pub transform: Transform,
    pub global_transform: GlobalTransform,
    pub texture: Handle<Image>,
    /// User indication of whether an entity is visible
    pub visibility: Visibility,
    /// Algorithmically-computed indication of whether an entity is visible and should be extracted for rendering
    pub computed_visibility: ComputedVisibility,
    //
    pub background_color: BackgroundColor,
    // cosmic bits
    /// text positioning enum
    pub text_position: CosmicTextPosition,
    /// text metrics
    pub cosmic_metrics: CosmicMetrics,
    /// text attributes
    pub cosmic_attrs: CosmicAttrs,
    /// bg img
    pub background_image: CosmicBackground,
    /// How many lines are allowed in buffer, 0 for no limit
    pub max_lines: CosmicMaxLines,
    /// How many characters are allowed in buffer, 0 for no limit
    pub max_chars: CosmicMaxChars,
    /// Setting this will update the buffer's text
    pub text: CosmicText,
}

impl Default for CosmicEditSpriteBundle {
    fn default() -> Self {
        Self {
            sprite: Default::default(),
            transform: Default::default(),
            global_transform: Default::default(),
            texture: DEFAULT_IMAGE_HANDLE.typed(),
            visibility: Visibility::Hidden,
            computed_visibility: Default::default(),
            background_color: Default::default(),
            text_position: Default::default(),
            cosmic_metrics: Default::default(),
            cosmic_attrs: Default::default(),
            background_image: Default::default(),
            max_lines: Default::default(),
            max_chars: Default::default(),
            text: Default::default(),
        }
    }
}

#[derive(Clone)]
pub struct EditHistoryItem {
    pub cursor: Cursor,
    pub lines: Vec<Vec<(String, AttrsOwned)>>,
}

#[derive(Component, Default)]
pub struct CosmicEditHistory {
    pub edits: VecDeque<EditHistoryItem>,
    pub current_edit: usize,
}

/// Plugin struct that adds systems and initializes resources related to cosmic edit functionality.
#[derive(Default)]
pub struct CosmicEditPlugin {
    pub font_config: CosmicFontConfig,
}

impl Plugin for CosmicEditPlugin {
    fn build(&self, app: &mut App) {
        let font_system = create_cosmic_font_system(self.font_config.clone());

        app.add_systems(PreUpdate, (cosmic_editor_builder, update_buffer_text))
            .add_systems(
                Update,
                (
                    cosmic_edit_bevy_events,
                    cosmic_edit_set_redraw,
                    on_scale_factor_change,
                    cosmic_edit_redraw_buffer_ui
                        .before(cosmic_edit_set_redraw)
                        .before(on_scale_factor_change),
                    cosmic_edit_redraw_buffer.before(on_scale_factor_change),
                    blink_cursor,
                    hide_inactive_cursor,
                    clear_inactive_selection,
                ),
            )
            .init_resource::<Focus>()
            .insert_resource(SwashCacheState {
                swash_cache: SwashCache::new(),
            })
            .insert_resource(CosmicFontSystem(font_system));
    }
}

/// Resource struct that keeps track of the currently active editor entity.
#[derive(Resource, Default, Deref, DerefMut)]
pub struct Focus(pub Option<Entity>);

/// Resource struct that holds configuration options for cosmic fonts.
#[derive(Resource, Clone)]
pub struct CosmicFontConfig {
    pub fonts_dir_path: Option<PathBuf>,
    pub font_bytes: Option<Vec<&'static [u8]>>,
    pub load_system_fonts: bool, // caution: this can be relatively slow
}

impl Default for CosmicFontConfig {
    fn default() -> Self {
        let fallback_font = include_bytes!("./font/FiraMono-Regular-subset.ttf");
        Self {
            load_system_fonts: false,
            font_bytes: Some(vec![fallback_font]),
            fonts_dir_path: None,
        }
    }
}

#[derive(Resource)]
struct SwashCacheState {
    swash_cache: SwashCache,
}

fn trim_text(text: CosmicText, max_chars: usize, max_lines: usize) -> CosmicText {
    if max_chars == 0 && max_lines == 0 {
        // no limits, no work to do
        return text;
    }

    match text {
        CosmicText::OneStyle(mut string) => {
            string.truncate(max_chars);

            if max_lines == 0 {
                return CosmicText::OneStyle(string);
            }

            let mut line_acc = 0;
            let mut char_pos = 0;
            for c in string.chars() {
                char_pos += 1;
                if c == 0xA as char {
                    line_acc += 1;
                    if line_acc >= max_lines {
                        // break text to pos
                        string.truncate(char_pos);
                        break;
                    }
                }
            }

            CosmicText::OneStyle(string)
        }
        CosmicText::MultiStyle(lines) => {
            let mut char_acc = 0;
            let mut line_acc = 0;

            let mut trimmed_styles = vec![];

            for line in lines.iter() {
                line_acc += 1;
                char_acc += 1; // count newlines for consistent behaviour

                if (line_acc >= max_lines && max_lines > 0)
                    || (char_acc >= max_chars && max_chars > 0)
                {
                    break;
                }

                let mut strs = vec![];

                for (string, attrs) in line.iter() {
                    if char_acc >= max_chars && max_chars > 0 {
                        break;
                    }

                    let mut string = string.clone();

                    if max_chars > 0 {
                        string.truncate(max_chars - char_acc);
                        char_acc += string.len();
                    }

                    if max_lines > 0 {
                        for c in string.chars() {
                            if c == 0xA as char {
                                line_acc += 1;
                                char_acc += 1; // count newlines for consistent behaviour
                                if line_acc >= max_lines {
                                    break;
                                }
                            }
                        }
                    }

                    strs.push((string, attrs.clone()));
                }
                trimmed_styles.push(strs);
            }
            CosmicText::MultiStyle(trimmed_styles)
        }
    }
}

fn create_cosmic_font_system(cosmic_font_config: CosmicFontConfig) -> FontSystem {
    let locale = sys_locale::get_locale().unwrap_or_else(|| String::from("en-US"));
    let mut db = cosmic_text::fontdb::Database::new();
    if let Some(dir_path) = cosmic_font_config.fonts_dir_path.clone() {
        db.load_fonts_dir(dir_path);
    }
    if let Some(custom_font_data) = &cosmic_font_config.font_bytes {
        for elem in custom_font_data {
            db.load_font_data(elem.to_vec());
        }
    }
    if cosmic_font_config.load_system_fonts {
        db.load_system_fonts();
    }
    cosmic_text::FontSystem::new_with_locale_and_db(locale, db)
}

fn on_scale_factor_change(
    mut scale_factor_changed: EventReader<WindowScaleFactorChanged>,
    mut cosmic_query: Query<(&mut CosmicEditor, &mut CosmicMetrics)>,
    mut font_system: ResMut<CosmicFontSystem>,
) {
    if !scale_factor_changed.is_empty() {
        let new_scale_factor = scale_factor_changed.iter().last().unwrap().scale_factor as f32;
        for (mut editor, metrics) in &mut cosmic_query.iter_mut() {
            let font_system = &mut font_system.0;
            let metrics =
                Metrics::new(metrics.font_size, metrics.line_height).scale(new_scale_factor);

            editor.0.buffer_mut().set_metrics(font_system, metrics);
            editor.0.buffer_mut().set_redraw(true);
        }
    }
}

pub fn get_node_cursor_pos(
    window: &Window,
    node_transform: &GlobalTransform,
    size: (f32, f32),
    is_ui_node: bool,
    camera: &Camera,
    camera_transform: &GlobalTransform,
) -> Option<(f32, f32)> {
    let (x_min, y_min, x_max, y_max) = (
        node_transform.affine().translation.x - size.0 / 2.,
        node_transform.affine().translation.y - size.1 / 2.,
        node_transform.affine().translation.x + size.0 / 2.,
        node_transform.affine().translation.y + size.1 / 2.,
    );

    window.cursor_position().and_then(|pos| {
        if is_ui_node {
            if x_min < pos.x && pos.x < x_max && y_min < pos.y && pos.y < y_max {
                Some((pos.x - x_min, pos.y - y_min))
            } else {
                None
            }
        } else {
            camera
                .viewport_to_world_2d(camera_transform, pos)
                .and_then(|pos| {
                    if x_min < pos.x && pos.x < x_max && y_min < pos.y && pos.y < y_max {
                        Some((pos.x - x_min, y_max - pos.y))
                    } else {
                        None
                    }
                })
        }
    })
}

/// Returns texts from a MultiStyle buffer
pub fn get_text_spans(
    buffer: &Buffer,
    default_attrs: AttrsOwned,
) -> Vec<Vec<(String, AttrsOwned)>> {
    let mut spans = Vec::new();
    for line in buffer.lines.iter() {
        let mut line_spans = Vec::new();
        let line_text = line.text();
        let line_attrs = line.attrs_list();
        if line_attrs.spans().is_empty() {
            line_spans.push((line_text.to_string(), default_attrs.clone()));
        } else {
            let mut current_pos = 0;
            for span in line_attrs.spans() {
                let span_range = span.0;
                let span_attrs = span.1.clone();
                let start_index = span_range.start;
                let end_index = span_range.end;
                if start_index > current_pos {
                    // Add the text between the current position and the start of the span
                    let non_span_text = line_text[current_pos..start_index].to_string();
                    line_spans.push((non_span_text, default_attrs.clone()));
                }
                let span_text = line_text[start_index..end_index].to_string();
                line_spans.push((span_text.clone(), span_attrs));
                current_pos = end_index;
            }
            if current_pos < line_text.len() {
                // Add the remaining text after the last span
                let remaining_text = line_text[current_pos..].to_string();
                line_spans.push((remaining_text, default_attrs.clone()));
            }
        }
        spans.push(line_spans);
    }
    spans
}

fn save_edit_history(
    editor: &mut Editor,
    attrs: &AttrsOwned,
    edit_history: &mut CosmicEditHistory,
) {
    let edits = &edit_history.edits;
    let current_lines = get_text_spans(editor.buffer(), attrs.clone());
    let current_edit = edit_history.current_edit;
    let mut new_edits = VecDeque::new();
    new_edits.extend(edits.iter().take(current_edit + 1).cloned());
    // remove old edits
    if new_edits.len() > 1000 {
        new_edits.drain(0..100);
    }
    new_edits.push_back(EditHistoryItem {
        cursor: editor.cursor(),
        lines: current_lines,
    });
    let len = new_edits.len();
    *edit_history = CosmicEditHistory {
        edits: new_edits,
        current_edit: len - 1,
    };
}

fn get_text_size(buffer: &Buffer) -> (f32, f32) {
    let width = buffer.layout_runs().map(|run| run.line_w).reduce(f32::max);
    let height = buffer.layout_runs().count() as f32 * buffer.metrics().line_height;
    if width.is_none() || height == 0. {
        return (1., 1.);
    }
    (width.unwrap(), height)
}

pub fn get_y_offset(buffer: &Buffer) -> i32 {
    let (_, text_height) = get_text_size(buffer);
    ((buffer.size().1 - text_height) / 2.0) as i32
}

pub fn get_x_offset(buffer: &Buffer) -> i32 {
    let (text_width, _) = get_text_size(buffer);
    ((buffer.size().0 - text_width) / 2.0) as i32
}

#[allow(clippy::too_many_arguments, clippy::type_complexity)]
// the meat of the input management
fn cosmic_edit_bevy_events(
    windows: Query<&Window, With<PrimaryWindow>>,
    active_editor: Res<Focus>,
    keys: Res<Input<KeyCode>>,
    mut char_evr: EventReader<ReceivedCharacter>,
    buttons: Res<Input<MouseButton>>,
    mut cosmic_edit_query: Query<
        (
            &mut CosmicEditor,
            &mut CosmicEditHistory,
            &GlobalTransform,
            &CosmicAttrs,
            &CosmicTextPosition,
            &CosmicMaxLines,
            &CosmicMaxChars,
            Entity,
        ),
        With<CosmicEditor>,
    >,
    readonly_query: Query<&ReadOnly>,
    node_query: Query<&mut Node>,
    sprite_query: Query<&mut Sprite>,
    mut font_system: ResMut<CosmicFontSystem>,
    mut is_deleting: Local<bool>,
    mut scroll_evr: EventReader<MouseWheel>,
    mut edits_duration: Local<Option<Duration>>,
    mut undoredo_duration: Local<Option<Duration>>,
    camera_q: Query<(&Camera, &GlobalTransform)>,
) {
    let primary_window = windows.single();
    let scale_factor = primary_window.scale_factor() as f32;
    let (camera, camera_transform) = camera_q.iter().find(|(c, _)| c.is_active).unwrap();
    for (
        mut editor,
        mut edit_history,
        node_transform,
        attrs,
        text_position,
        max_lines,
        max_chars,
        entity,
    ) in &mut cosmic_edit_query.iter_mut()
    {
        let readonly = readonly_query.get(entity).is_ok();

        let (width, height, is_ui_node) = match node_query.get(entity) {
            Ok(node) => (node.size().x, node.size().y, true),
            Err(_) => {
                let sprite = sprite_query.get(entity).unwrap();
                let size = sprite.custom_size.unwrap();
                (size.x, size.y, false)
            }
        };

        let attrs = &attrs.0;

        if active_editor.0 == Some(entity) {
            let now_ms = get_timestamp();

            #[cfg(target_os = "macos")]
            let command = keys.any_pressed([KeyCode::SuperLeft, KeyCode::SuperRight]);

            #[cfg(not(target_os = "macos"))]
            let command = keys.any_pressed([KeyCode::ControlLeft, KeyCode::ControlRight]);

            let shift = keys.any_pressed([KeyCode::ShiftLeft, KeyCode::ShiftRight]);

            #[cfg(target_os = "macos")]
            let option = keys.any_pressed([KeyCode::AltLeft, KeyCode::AltRight]);

            // if shift key is pressed
            let already_has_selection = editor.0.select_opt().is_some();
            if shift && !already_has_selection {
                let cursor = editor.0.cursor();
                editor.0.set_select_opt(Some(cursor));
            }

            #[cfg(target_os = "macos")]
            let should_jump = command && option;
            #[cfg(not(target_os = "macos"))]
            let should_jump = command;

            if should_jump && keys.just_pressed(KeyCode::Left) {
                editor.0.action(&mut font_system.0, Action::PreviousWord);
                if !shift {
                    editor.0.set_select_opt(None);
                }
                return;
            }
            if should_jump && keys.just_pressed(KeyCode::Right) {
                editor.0.action(&mut font_system.0, Action::NextWord);
                if !shift {
                    editor.0.set_select_opt(None);
                }
                return;
            }
            if should_jump && keys.just_pressed(KeyCode::Home) {
                editor.0.action(&mut font_system.0, Action::BufferStart);
                // there's a bug with cosmic text where it doesn't update the visual cursor for this action
                // TODO: fix upstream
                editor.0.buffer_mut().set_redraw(true);
                if !shift {
                    editor.0.set_select_opt(None);
                }
                return;
            }
            if should_jump && keys.just_pressed(KeyCode::End) {
                editor.0.action(&mut font_system.0, Action::BufferEnd);
                // there's a bug with cosmic text where it doesn't update the visual cursor for this action
                // TODO: fix upstream
                editor.0.buffer_mut().set_redraw(true);
                if !shift {
                    editor.0.set_select_opt(None);
                }
                return;
            }

            if keys.just_pressed(KeyCode::Left) {
                editor.0.action(&mut font_system.0, Action::Left);
                if !shift {
                    editor.0.set_select_opt(None);
                }
                return;
            }
            if keys.just_pressed(KeyCode::Right) {
                editor.0.action(&mut font_system.0, Action::Right);
                if !shift {
                    editor.0.set_select_opt(None);
                }
                return;
            }
            if keys.just_pressed(KeyCode::Up) {
                editor.0.action(&mut font_system.0, Action::Up);
                if !shift {
                    editor.0.set_select_opt(None);
                }
                return;
            }
            if keys.just_pressed(KeyCode::Down) {
                editor.0.action(&mut font_system.0, Action::Down);
                if !shift {
                    editor.0.set_select_opt(None);
                }
                return;
            }

            if !readonly && keys.just_pressed(KeyCode::Back) {
                #[cfg(target_arch = "wasm32")]
                editor.0.action(&mut font_system.0, Action::Backspace);
                *is_deleting = true;
            }
            if !readonly && keys.just_released(KeyCode::Back) {
                *is_deleting = false;
            }
            if !readonly && keys.just_pressed(KeyCode::Delete) {
                editor.0.action(&mut font_system.0, Action::Delete);
            }
            if keys.just_pressed(KeyCode::Escape) {
                editor.0.action(&mut font_system.0, Action::Escape);
            }
            if command && keys.just_pressed(KeyCode::A) {
                editor.0.action(&mut font_system.0, Action::BufferEnd);
                let current_cursor = editor.0.cursor();
                editor.0.set_select_opt(Some(Cursor {
                    line: 0,
                    index: 0,
                    affinity: current_cursor.affinity,
                    color: current_cursor.color,
                }));
                return;
            }
            if keys.just_pressed(KeyCode::Home) {
                editor.0.action(&mut font_system.0, Action::Home);
                if !shift {
                    editor.0.set_select_opt(None);
                }
                return;
            }
            if keys.just_pressed(KeyCode::End) {
                editor.0.action(&mut font_system.0, Action::End);
                if !shift {
                    editor.0.set_select_opt(None);
                }
                return;
            }
            if keys.just_pressed(KeyCode::PageUp) {
                editor.0.action(&mut font_system.0, Action::PageUp);
                if !shift {
                    editor.0.set_select_opt(None);
                }
                return;
            }
            if keys.just_pressed(KeyCode::PageDown) {
                editor.0.action(&mut font_system.0, Action::PageDown);
                if !shift {
                    editor.0.set_select_opt(None);
                }
                return;
            }

            // redo
            #[cfg(not(target_os = "windows"))]
            let requested_redo = command && shift && keys.just_pressed(KeyCode::Z);
            #[cfg(target_os = "windows")]
            let requested_redo = command && keys.just_pressed(KeyCode::Y);

            if !readonly && requested_redo {
                let edits = &edit_history.edits;
                if edits.is_empty() {
                    return;
                }
                if edit_history.current_edit == edits.len() - 1 {
                    return;
                }
                let idx = edit_history.current_edit + 1;
                if let Some(current_edit) = edits.get(idx) {
                    editor.0.buffer_mut().lines.clear();
                    for line in current_edit.lines.iter() {
                        let mut line_text = String::new();
                        let mut attrs_list = AttrsList::new(attrs.as_attrs());
                        for (text, attrs) in line.iter() {
                            let start = line_text.len();
                            line_text.push_str(text);
                            let end = line_text.len();
                            attrs_list.add_span(start..end, attrs.as_attrs());
                        }
                        editor.0.buffer_mut().lines.push(BufferLine::new(
                            line_text,
                            attrs_list,
                            Shaping::Advanced,
                        ));
                    }
                    editor.0.set_cursor(current_edit.cursor);
                    editor.0.buffer_mut().set_redraw(true);
                    edit_history.current_edit += 1;
                }
                *undoredo_duration = Some(Duration::from_millis(now_ms as u64));
                return;
            }
            // undo
            let requested_undo = command && keys.just_pressed(KeyCode::Z);

            if !readonly && requested_undo {
                let edits = &edit_history.edits;
                if edits.is_empty() {
                    return;
                }
                if edit_history.current_edit <= 1 {
                    return;
                }
                let idx = edit_history.current_edit - 1;
                if let Some(current_edit) = edits.get(idx) {
                    editor.0.buffer_mut().lines.clear();
                    for line in current_edit.lines.iter() {
                        let mut line_text = String::new();
                        let mut attrs_list = AttrsList::new(attrs.as_attrs());
                        for (text, attrs) in line.iter() {
                            let start = line_text.len();
                            line_text.push_str(text);
                            let end = line_text.len();
                            attrs_list.add_span(start..end, attrs.as_attrs());
                        }
                        editor.0.buffer_mut().lines.push(BufferLine::new(
                            line_text,
                            attrs_list,
                            Shaping::Advanced,
                        ));
                    }
                    editor.0.set_cursor(current_edit.cursor);
                    editor.0.buffer_mut().set_redraw(true);
                    edit_history.current_edit -= 1;
                }
                *undoredo_duration = Some(Duration::from_millis(now_ms as u64));
                return;
            }

            let mut is_clipboard = false;
            #[cfg(not(target_arch = "wasm32"))]
            {
                if let Ok(mut clipboard) = arboard::Clipboard::new() {
                    if command && keys.just_pressed(KeyCode::C) {
                        if let Some(text) = editor.0.copy_selection() {
                            clipboard.set_text(text).unwrap();
                            return;
                        }
                    }
                    if !readonly && command && keys.just_pressed(KeyCode::X) {
                        if let Some(text) = editor.0.copy_selection() {
                            clipboard.set_text(text).unwrap();
                            editor.0.delete_selection();
                        }
                        is_clipboard = true;
                    }
                    if !readonly && command && keys.just_pressed(KeyCode::V) {
                        if let Ok(text) = clipboard.get_text() {
                            for c in text.chars() {
                                if max_chars.0 == 0 || editor.get_text().len() < max_chars.0 {
                                    if c == 0xA as char {
                                        if max_lines.0 == 0
                                            || editor.0.buffer().lines.len() < max_lines.0
                                        {
                                            editor.0.action(&mut font_system.0, Action::Insert(c));
                                        }
                                    } else {
                                        editor.0.action(&mut font_system.0, Action::Insert(c));
                                    }
                                }
                            }
                        }
                        is_clipboard = true;
                    }
                }
            }
            let (offset_x, offset_y) = match text_position {
                CosmicTextPosition::Center => (
                    get_x_offset(editor.0.buffer()),
                    get_y_offset(editor.0.buffer()),
                ),
                CosmicTextPosition::TopLeft => (0, 0),
            };
            let point = |node_cursor_pos: (f32, f32)| {
                (