diff options
Diffstat (limited to 'examples/editor/src/main.rs')
| -rw-r--r-- | examples/editor/src/main.rs | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/examples/editor/src/main.rs b/examples/editor/src/main.rs new file mode 100644 index 00000000..03d1e283 --- /dev/null +++ b/examples/editor/src/main.rs @@ -0,0 +1,312 @@ +use iced::executor; +use iced::highlighter::{self, Highlighter}; +use iced::keyboard; +use iced::theme::{self, Theme}; +use iced::widget::{ + button, column, container, horizontal_space, pick_list, row, text, + text_editor, tooltip, +}; +use iced::{ + Alignment, Application, Command, Element, Font, Length, Settings, + Subscription, +}; + +use std::ffi; +use std::io; +use std::path::{Path, PathBuf}; +use std::sync::Arc; + +pub fn main() -> iced::Result { + Editor::run(Settings { + fonts: vec![include_bytes!("../fonts/icons.ttf").as_slice().into()], + default_font: Font::MONOSPACE, + ..Settings::default() + }) +} + +struct Editor { + file: Option<PathBuf>, + content: text_editor::Content, + theme: highlighter::Theme, + is_loading: bool, + is_dirty: bool, +} + +#[derive(Debug, Clone)] +enum Message { + ActionPerformed(text_editor::Action), + ThemeSelected(highlighter::Theme), + NewFile, + OpenFile, + FileOpened(Result<(PathBuf, Arc<String>), Error>), + SaveFile, + FileSaved(Result<PathBuf, Error>), +} + +impl Application for Editor { + type Message = Message; + type Theme = Theme; + type Executor = executor::Default; + type Flags = (); + + fn new(_flags: Self::Flags) -> (Self, Command<Message>) { + ( + Self { + file: None, + content: text_editor::Content::new(), + theme: highlighter::Theme::SolarizedDark, + is_loading: true, + is_dirty: false, + }, + Command::perform(load_file(default_file()), Message::FileOpened), + ) + } + + fn title(&self) -> String { + String::from("Editor - Iced") + } + + fn update(&mut self, message: Message) -> Command<Message> { + match message { + Message::ActionPerformed(action) => { + self.is_dirty = self.is_dirty || action.is_edit(); + + self.content.perform(action); + + Command::none() + } + Message::ThemeSelected(theme) => { + self.theme = theme; + + Command::none() + } + Message::NewFile => { + if !self.is_loading { + self.file = None; + self.content = text_editor::Content::new(); + } + + Command::none() + } + Message::OpenFile => { + if self.is_loading { + Command::none() + } else { + self.is_loading = true; + + Command::perform(open_file(), Message::FileOpened) + } + } + Message::FileOpened(result) => { + self.is_loading = false; + self.is_dirty = false; + + if let Ok((path, contents)) = result { + self.file = Some(path); + self.content = text_editor::Content::with_text(&contents); + } + + Command::none() + } + Message::SaveFile => { + if self.is_loading { + Command::none() + } else { + self.is_loading = true; + + Command::perform( + save_file(self.file.clone(), self.content.text()), + Message::FileSaved, + ) + } + } + Message::FileSaved(result) => { + self.is_loading = false; + + if let Ok(path) = result { + self.file = Some(path); + self.is_dirty = false; + } + + Command::none() + } + } + } + + fn subscription(&self) -> Subscription<Message> { + keyboard::on_key_press(|key_code, modifiers| match key_code { + keyboard::KeyCode::S if modifiers.command() => { + Some(Message::SaveFile) + } + _ => None, + }) + } + + fn view(&self) -> Element<Message> { + let controls = row![ + action(new_icon(), "New file", Some(Message::NewFile)), + action( + open_icon(), + "Open file", + (!self.is_loading).then_some(Message::OpenFile) + ), + action( + save_icon(), + "Save file", + self.is_dirty.then_some(Message::SaveFile) + ), + horizontal_space(Length::Fill), + pick_list( + highlighter::Theme::ALL, + Some(self.theme), + Message::ThemeSelected + ) + .text_size(14) + .padding([5, 10]) + ] + .spacing(10) + .align_items(Alignment::Center); + + let status = row![ + text(if let Some(path) = &self.file { + let path = path.display().to_string(); + + if path.len() > 60 { + format!("...{}", &path[path.len() - 40..]) + } else { + path + } + } else { + String::from("New file") + }), + horizontal_space(Length::Fill), + text({ + let (line, column) = self.content.cursor_position(); + + format!("{}:{}", line + 1, column + 1) + }) + ] + .spacing(10); + + column![ + controls, + text_editor(&self.content) + .on_action(Message::ActionPerformed) + .highlight::<Highlighter>( + highlighter::Settings { + theme: self.theme, + extension: self + .file + .as_deref() + .and_then(Path::extension) + .and_then(ffi::OsStr::to_str) + .map(str::to_string) + .unwrap_or(String::from("rs")), + }, + |highlight, _theme| highlight.to_format() + ), + status, + ] + .spacing(10) + .padding(10) + .into() + } + + fn theme(&self) -> Theme { + if self.theme.is_dark() { + Theme::Dark + } else { + Theme::Light + } + } +} + +#[derive(Debug, Clone)] +pub enum Error { + DialogClosed, + IoError(io::ErrorKind), +} + +fn default_file() -> PathBuf { + PathBuf::from(format!("{}/src/main.rs", env!("CARGO_MANIFEST_DIR"))) +} + +async fn open_file() -> Result<(PathBuf, Arc<String>), Error> { + let picked_file = rfd::AsyncFileDialog::new() + .set_title("Open a text file...") + .pick_file() + .await + .ok_or(Error::DialogClosed)?; + + load_file(picked_file.path().to_owned()).await +} + +async fn load_file(path: PathBuf) -> Result<(PathBuf, Arc<String>), Error> { + let contents = tokio::fs::read_to_string(&path) + .await + .map(Arc::new) + .map_err(|error| Error::IoError(error.kind()))?; + + Ok((path, contents)) +} + +async fn save_file( + path: Option<PathBuf>, + contents: String, +) -> Result<PathBuf, Error> { + let path = if let Some(path) = path { + path + } else { + rfd::AsyncFileDialog::new() + .save_file() + .await + .as_ref() + .map(rfd::FileHandle::path) + .map(Path::to_owned) + .ok_or(Error::DialogClosed)? + }; + + tokio::fs::write(&path, contents) + .await + .map_err(|error| Error::IoError(error.kind()))?; + + Ok(path) +} + +fn action<'a, Message: Clone + 'a>( + content: impl Into<Element<'a, Message>>, + label: &'a str, + on_press: Option<Message>, +) -> Element<'a, Message> { + let action = button(container(content).width(30).center_x()); + + if let Some(on_press) = on_press { + tooltip( + action.on_press(on_press), + label, + tooltip::Position::FollowCursor, + ) + .style(theme::Container::Box) + .into() + } else { + action.style(theme::Button::Secondary).into() + } +} + +fn new_icon<'a, Message>() -> Element<'a, Message> { + icon('\u{0e800}') +} + +fn save_icon<'a, Message>() -> Element<'a, Message> { + icon('\u{0e801}') +} + +fn open_icon<'a, Message>() -> Element<'a, Message> { + icon('\u{0f115}') +} + +fn icon<'a, Message>(codepoint: char) -> Element<'a, Message> { + const ICON_FONT: Font = Font::with_name("editor-icons"); + + text(codepoint).font(ICON_FONT).into() +} |