mirror of
https://github.com/ratatui-org/ratatui
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refactor(example): improve constraints and flex examples (#817)
This PR is a follow up to https://github.com/ratatui-org/ratatui/pull/811. It improves the UI of the layouts by - thoughtful accessible color that represent priority in constraints resolving - using QUADRANT_OUTSIDE symbol set for block rendering - adding a scrollbar - panic handling - refactoring for readability to name a few. Here are some example gifs of the outcome:   --------- Co-authored-by: Dheepak Krishnamurthy <me@kdheepak.com> Co-authored-by: Josh McKinney <joshka@users.noreply.github.com>
This commit is contained in:
Valentin271
GitHub
parent
48b0380cb3
commit
813f707892
3 changed files with 752 additions and 683 deletions
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@ -1,435 +1,374 @@
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use std::{error::Error, io};
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use std::io::{self, stdout};
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use color_eyre::{config::HookBuilder, Result};
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use crossterm::{
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event::{self, Event, KeyCode},
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execute,
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terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
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ExecutableCommand,
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};
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use itertools::Itertools;
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use ratatui::{layout::Constraint::*, prelude::*, widgets::*};
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use ratatui::{layout::Constraint::*, prelude::*, style::palette::tailwind, widgets::*};
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use strum::{Display, EnumIter, FromRepr, IntoEnumIterator};
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fn main() -> Result<(), Box<dyn Error>> {
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// setup terminal
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enable_raw_mode()?;
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let mut stdout = io::stdout();
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execute!(stdout, EnterAlternateScreen)?;
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let backend = CrosstermBackend::new(stdout);
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let mut terminal = Terminal::new(backend)?;
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const SPACER_HEIGHT: u16 = 0;
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const ILLUSTRATION_HEIGHT: u16 = 4;
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const EXAMPLE_HEIGHT: u16 = ILLUSTRATION_HEIGHT + SPACER_HEIGHT;
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// Each line in the example is a layout
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// There is on average 4 row per example
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// 4 row * 7 example = 28
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// Plus additional layout for tabs ...
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// Examples might also grow in a very near future
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Layout::init_cache(50);
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// priority 1
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const FIXED_COLOR: Color = tailwind::RED.c900;
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// priority 2
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const MIN_COLOR: Color = tailwind::BLUE.c900;
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const MAX_COLOR: Color = tailwind::BLUE.c800;
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// priority 3
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const LENGTH_COLOR: Color = tailwind::SLATE.c700;
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const PERCENTAGE_COLOR: Color = tailwind::SLATE.c800;
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const RATIO_COLOR: Color = tailwind::SLATE.c900;
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// priority 4
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const PROPORTIONAL_COLOR: Color = tailwind::SLATE.c950;
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// create app and run it
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let res = run_app(&mut terminal);
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// restore terminal
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disable_raw_mode()?;
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execute!(terminal.backend_mut(), LeaveAlternateScreen)?;
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terminal.show_cursor()?;
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if let Err(err) = res {
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println!("{err:?}");
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}
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Ok(())
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#[derive(Default, Clone, Copy)]
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struct App {
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selected_tab: SelectedTab,
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scroll_offset: u16,
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max_scroll_offset: u16,
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state: AppState,
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}
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fn run_app<B: Backend>(terminal: &mut Terminal<B>) -> io::Result<()> {
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let mut selection = ExampleSelection::Fixed;
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loop {
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terminal.draw(|f| f.render_widget(selection, f.size()))?;
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if let Event::Key(key) = event::read()? {
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use KeyCode::*;
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match key.code {
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Char('q') => break Ok(()),
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Char('j') | Char('l') | Down | Right => {
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selection = selection.next();
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}
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Char('k') | Char('h') | Up | Left => {
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selection = selection.previous();
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}
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_ => (),
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}
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}
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}
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}
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#[derive(Debug, Copy, Clone)]
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enum ExampleSelection {
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/// Tabs for the different examples
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///
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/// The order of the variants is the order in which they are displayed.
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#[derive(Default, Debug, Copy, Clone, Display, FromRepr, EnumIter, PartialEq, Eq)]
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enum SelectedTab {
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#[default]
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Fixed,
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Min,
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Max,
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Length,
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Percentage,
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Ratio,
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Proportional,
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Min,
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Max,
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}
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impl ExampleSelection {
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fn previous(&self) -> Self {
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use ExampleSelection::*;
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match *self {
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Fixed => Fixed,
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Length => Fixed,
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Percentage => Length,
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Ratio => Percentage,
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Proportional => Ratio,
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Min => Proportional,
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Max => Min,
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#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
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enum AppState {
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#[default]
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Running,
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Quit,
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}
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fn main() -> Result<()> {
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init_error_hooks()?;
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let terminal = init_terminal()?;
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// increase the cache size to avoid flickering for indeterminate layouts
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Layout::init_cache(100);
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App::default().run(terminal)?;
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restore_terminal()?;
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Ok(())
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}
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impl App {
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fn run(&mut self, mut terminal: Terminal<impl Backend>) -> Result<()> {
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self.update_max_scroll_offset();
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while self.is_running() {
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self.draw(&mut terminal)?;
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self.handle_events()?;
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}
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Ok(())
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}
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fn next(&self) -> Self {
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use ExampleSelection::*;
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match *self {
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Fixed => Length,
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Length => Percentage,
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Percentage => Ratio,
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Ratio => Proportional,
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Proportional => Min,
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Min => Max,
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Max => Max,
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}
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fn update_max_scroll_offset(&mut self) {
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self.max_scroll_offset = (self.selected_tab.get_example_count() - 1) * EXAMPLE_HEIGHT;
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}
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fn selected(&self) -> usize {
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use ExampleSelection::*;
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match self {
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Fixed => 0,
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Length => 1,
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Percentage => 2,
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Ratio => 3,
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Proportional => 4,
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Min => 5,
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Max => 6,
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fn is_running(&self) -> bool {
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self.state == AppState::Running
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}
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fn draw(self, terminal: &mut Terminal<impl Backend>) -> io::Result<()> {
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terminal.draw(|frame| frame.render_widget(self, frame.size()))?;
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Ok(())
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}
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fn handle_events(&mut self) -> Result<()> {
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if let Event::Key(key) = event::read()? {
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use KeyCode::*;
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match key.code {
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Char('q') | Esc => self.quit(),
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Char('l') | Right => self.next(),
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Char('h') | Left => self.previous(),
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Char('j') | Down => self.down(),
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Char('k') | Up => self.up(),
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Char('g') | Home => self.top(),
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Char('G') | End => self.bottom(),
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_ => (),
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}
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}
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Ok(())
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}
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fn quit(&mut self) {
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self.state = AppState::Quit;
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}
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fn next(&mut self) {
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self.selected_tab = self.selected_tab.next();
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self.update_max_scroll_offset();
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self.scroll_offset = 0;
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}
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fn previous(&mut self) {
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self.selected_tab = self.selected_tab.previous();
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self.update_max_scroll_offset();
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self.scroll_offset = 0;
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}
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fn up(&mut self) {
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self.scroll_offset = self.scroll_offset.saturating_sub(1)
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}
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fn down(&mut self) {
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self.scroll_offset = self
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.scroll_offset
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.saturating_add(1)
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.min(self.max_scroll_offset)
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}
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fn top(&mut self) {
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self.scroll_offset = 0;
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}
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fn bottom(&mut self) {
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self.scroll_offset = self.max_scroll_offset;
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}
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}
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impl Widget for ExampleSelection {
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impl Widget for App {
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fn render(self, area: Rect, buf: &mut Buffer) {
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let [tabs, area] = area.split(&Layout::vertical([Fixed(3), Proportional(0)]));
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let [area, _] = area.split(&Layout::horizontal([Fixed(80), Proportional(0)]));
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let [tabs, axis, demo] = area.split(&Layout::vertical([
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Constraint::Fixed(3),
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Constraint::Fixed(3),
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Proportional(0),
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]));
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self.render_tabs(tabs, buf);
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self.render_axis(axis, buf);
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self.render_demo(demo, buf);
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}
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}
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match self {
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ExampleSelection::Fixed => self.render_fixed_example(area, buf),
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ExampleSelection::Length => self.render_length_example(area, buf),
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ExampleSelection::Percentage => self.render_percentage_example(area, buf),
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ExampleSelection::Ratio => self.render_ratio_example(area, buf),
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ExampleSelection::Proportional => self.render_proportional_example(area, buf),
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ExampleSelection::Min => self.render_min_example(area, buf),
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ExampleSelection::Max => self.render_max_example(area, buf),
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impl App {
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fn render_tabs(&self, area: Rect, buf: &mut Buffer) {
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let titles = SelectedTab::iter().map(SelectedTab::to_tab_title);
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let block = Block::new()
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.title("Constraints ".bold())
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.title(" Use h l or ◄ ► to change tab and j k or ▲ ▼ to scroll");
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Tabs::new(titles)
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.block(block)
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.highlight_style(Modifier::REVERSED)
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.select(self.selected_tab as usize)
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.padding("", "")
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.divider(" ")
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.render(area, buf);
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}
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fn render_axis(&self, area: Rect, buf: &mut Buffer) {
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let width = area.width as usize;
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// a bar like `<----- 80 px ----->`
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let width_label = format!("{} px", width);
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let width_bar = format!(
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"<{width_label:-^width$}>",
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width = width - width_label.len() / 2
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);
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Paragraph::new(width_bar.dark_gray())
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.alignment(Alignment::Center)
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.block(Block::default().padding(Padding {
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left: 0,
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right: 0,
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top: 1,
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bottom: 0,
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}))
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.render(area, buf);
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}
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/// Render the demo content
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///
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/// This function renders the demo content into a separate buffer and then splices the buffer
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/// into the main buffer. This is done to make it possible to handle scrolling easily.
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fn render_demo(&self, area: Rect, buf: &mut Buffer) {
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// render demo content into a separate buffer so all examples fit we add an extra
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// area.height to make sure the last example is fully visible even when the scroll offset is
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// at the max
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let height = self.selected_tab.get_example_count() * EXAMPLE_HEIGHT;
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let demo_area = Rect::new(0, 0, area.width, height + area.height);
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let mut demo_buf = Buffer::empty(demo_area);
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let scrollbar_needed = self.scroll_offset != 0 || height > area.height;
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let content_area = if scrollbar_needed {
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Rect {
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width: demo_area.width - 1,
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..demo_area
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}
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} else {
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demo_area
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};
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self.selected_tab.render(content_area, &mut demo_buf);
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let visible_content = demo_buf
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.content
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.into_iter()
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.skip((demo_area.width * self.scroll_offset) as usize)
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.take(area.area() as usize);
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for (i, cell) in visible_content.enumerate() {
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let x = i as u16 % area.width;
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let y = i as u16 / area.width;
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*buf.get_mut(area.x + x, area.y + y) = cell;
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}
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if scrollbar_needed {
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let mut state = ScrollbarState::new(self.max_scroll_offset as usize)
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.position(self.scroll_offset as usize);
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Scrollbar::new(ScrollbarOrientation::VerticalRight).render(area, buf, &mut state);
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}
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}
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}
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impl ExampleSelection {
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fn render_tabs(&self, area: Rect, buf: &mut Buffer) {
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// ┌Constraints───────────────────────────────────────────────────────────────────┐
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// │ Fixed │ Length │ Percentage │ Ratio │ Proportional │ Min │ Max │
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// └──────────────────────────────────────────────────────────────────────────────┘
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Tabs::new(
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[
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ExampleSelection::Fixed,
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ExampleSelection::Length,
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ExampleSelection::Percentage,
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ExampleSelection::Ratio,
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ExampleSelection::Proportional,
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ExampleSelection::Min,
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ExampleSelection::Max,
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]
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.iter()
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.map(|e| format!("{:?}", e)),
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)
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.block(Block::bordered().title("Constraints"))
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.highlight_style(Style::default().yellow())
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.select(self.selected())
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.padding(" ", " ")
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.render(area, buf);
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impl SelectedTab {
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/// Get the previous tab, if there is no previous tab return the current tab.
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fn previous(&self) -> Self {
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let current_index: usize = *self as usize;
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let previous_index = current_index.saturating_sub(1);
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Self::from_repr(previous_index).unwrap_or(*self)
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}
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/// Get the next tab, if there is no next tab return the current tab.
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fn next(&self) -> Self {
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let current_index = *self as usize;
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let next_index = current_index.saturating_add(1);
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Self::from_repr(next_index).unwrap_or(*self)
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}
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fn get_example_count(&self) -> u16 {
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use SelectedTab::*;
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match self {
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Fixed => 4,
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Length => 4,
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Percentage => 5,
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Ratio => 4,
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Proportional => 2,
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Min => 5,
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Max => 5,
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}
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}
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fn to_tab_title(value: SelectedTab) -> Line<'static> {
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use SelectedTab::*;
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let text = format!(" {value} ");
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let color = match value {
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Fixed => FIXED_COLOR,
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Length => LENGTH_COLOR,
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Percentage => PERCENTAGE_COLOR,
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Ratio => RATIO_COLOR,
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Proportional => PROPORTIONAL_COLOR,
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Min => MIN_COLOR,
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Max => MAX_COLOR,
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};
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text.fg(tailwind::SLATE.c200).bg(color).into()
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}
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}
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impl Widget for SelectedTab {
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fn render(self, area: Rect, buf: &mut Buffer) {
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match self {
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SelectedTab::Fixed => self.render_fixed_example(area, buf),
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SelectedTab::Length => self.render_length_example(area, buf),
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SelectedTab::Percentage => self.render_percentage_example(area, buf),
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SelectedTab::Ratio => self.render_ratio_example(area, buf),
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SelectedTab::Proportional => self.render_proportional_example(area, buf),
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SelectedTab::Min => self.render_min_example(area, buf),
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SelectedTab::Max => self.render_max_example(area, buf),
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}
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}
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}
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impl SelectedTab {
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fn render_fixed_example(&self, area: Rect, buf: &mut Buffer) {
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let [example1, example2, _] = area.split(&Layout::vertical([Fixed(8); 3]));
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let [example1, example2, example3, example4, _] =
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area.split(&Layout::vertical([Fixed(EXAMPLE_HEIGHT); 5]));
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// Fixed(40), Proportional(0)
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//
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// <---------------------50 px---------------------->
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//
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// ┌──────────────────────────────────────┐┌────────┐
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// │ 40 px ││ 10 px │
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// └──────────────────────────────────────┘└────────┘
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Example::new([Fixed(40), Proportional(0)]).render(example1, buf);
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// Fixed(20), Fixed(20), Proportional(0)
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//
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// <---------------------50 px---------------------->
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//
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// ┌──────────────────┐┌──────────────────┐┌────────┐
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// │ 20 px ││ 20 px ││ 10 px │
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// └──────────────────┘└──────────────────┘└────────┘
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Example::new([Fixed(20), Fixed(20), Proportional(0)]).render(example2, buf);
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Example::new(&[Fixed(40), Proportional(0)]).render(example1, buf);
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Example::new(&[Fixed(20), Fixed(20), Proportional(0)]).render(example2, buf);
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Example::new(&[Fixed(20), Min(20), Max(20)]).render(example3, buf);
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Example::new(&[
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Length(20),
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Percentage(20),
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Ratio(1, 5),
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Proportional(1),
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Fixed(15),
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])
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.render(example4, buf);
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}
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fn render_length_example(&self, area: Rect, buf: &mut Buffer) {
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let [example1, example2, example3, example4, _] =
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area.split(&Layout::vertical([Fixed(8); 5]));
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area.split(&Layout::vertical([Fixed(EXAMPLE_HEIGHT); 5]));
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// Length(20), Fixed(20)
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//
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// <---------------------50 px---------------------->
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//
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// ┌────────────────────────────┐┌──────────────────┐
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// │ 30 px ││ 20 px │
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// └────────────────────────────┘└──────────────────┘
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Example::new([Length(20), Fixed(20)]).render(example1, buf);
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// Length(20), Length(20)
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//
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// <---------------------50 px---------------------->
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//
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// ┌──────────────────┐┌────────────────────────────┐
|
||||
// │ 20 px ││ 30 px │
|
||||
// └──────────────────┘└────────────────────────────┘
|
||||
Example::new([Length(20), Length(20)]).render(example2, buf);
|
||||
|
||||
// Length(20), Min(20)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌──────────────────┐┌────────────────────────────┐
|
||||
// │ 20 px ││ 30 px │
|
||||
// └──────────────────┘└────────────────────────────┘
|
||||
Example::new([Length(20), Min(20)]).render(example3, buf);
|
||||
|
||||
// Length(20), Max(20)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────┐┌──────────────────┐
|
||||
// │ 30 px ││ 20 px │
|
||||
// └────────────────────────────┘└──────────────────┘
|
||||
Example::new([Length(20), Max(20)]).render(example4, buf);
|
||||
Example::new(&[Length(20), Fixed(20)]).render(example1, buf);
|
||||
Example::new(&[Length(20), Length(20)]).render(example2, buf);
|
||||
Example::new(&[Length(20), Min(20)]).render(example3, buf);
|
||||
Example::new(&[Length(20), Max(20)]).render(example4, buf);
|
||||
}
|
||||
|
||||
fn render_percentage_example(&self, area: Rect, buf: &mut Buffer) {
|
||||
let [example1, example2, example3, example4, example5, _] =
|
||||
area.split(&Layout::vertical([Fixed(8); 6]));
|
||||
area.split(&Layout::vertical([Fixed(EXAMPLE_HEIGHT); 6]));
|
||||
|
||||
// Percentage(75), Proportional(0)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────────────────────────┐
|
||||
// │ 50 px │
|
||||
// └────────────────────────────────────────────────┘
|
||||
//
|
||||
Example::new([Percentage(75), Proportional(0)]).render(example1, buf);
|
||||
|
||||
// Percentage(25), Proportional(0)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────────────────────────┐
|
||||
// │ 50 px │
|
||||
// └────────────────────────────────────────────────┘
|
||||
Example::new([Percentage(25), Proportional(0)]).render(example2, buf);
|
||||
|
||||
// Percentage(50), Min(20)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌───────────────────────┐┌───────────────────────┐
|
||||
// │ 25 px ││ 25 px │
|
||||
// └───────────────────────┘└───────────────────────┘
|
||||
Example::new([Percentage(50), Min(20)]).render(example3, buf);
|
||||
|
||||
// Percentage(0), Max(0)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────────────────────────┐
|
||||
// │ 50 px │
|
||||
// └────────────────────────────────────────────────┘
|
||||
Example::new([Percentage(0), Max(0)]).render(example4, buf);
|
||||
|
||||
// Percentage(0), Proportional(0)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────────────────────────┐
|
||||
// │ 50 px │
|
||||
// └────────────────────────────────────────────────┘
|
||||
Example::new([Percentage(0), Proportional(0)]).render(example5, buf);
|
||||
Example::new(&[Percentage(75), Proportional(0)]).render(example1, buf);
|
||||
Example::new(&[Percentage(25), Proportional(0)]).render(example2, buf);
|
||||
Example::new(&[Percentage(50), Min(20)]).render(example3, buf);
|
||||
Example::new(&[Percentage(0), Max(0)]).render(example4, buf);
|
||||
Example::new(&[Percentage(0), Proportional(0)]).render(example5, buf);
|
||||
}
|
||||
|
||||
fn render_ratio_example(&self, area: Rect, buf: &mut Buffer) {
|
||||
let [example1, example2, example3, example4, _] =
|
||||
area.split(&Layout::vertical([Fixed(8); 5]));
|
||||
area.split(&Layout::vertical([Fixed(EXAMPLE_HEIGHT); 5]));
|
||||
|
||||
// Ratio(1, 2), Ratio(1, 2)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌───────────────────────┐┌───────────────────────┐
|
||||
// │ 25 px ││ 25 px │
|
||||
// └───────────────────────┘└───────────────────────┘
|
||||
Example::new([Ratio(1, 2); 2]).render(example1, buf);
|
||||
|
||||
// Ratio(1, 4), Ratio(1, 4), Ratio(1, 4), Ratio(1, 4)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌───────────┐┌──────────┐┌───────────┐┌──────────┐
|
||||
// │ 13 px ││ 12 px ││ 13 px ││ 12 px │
|
||||
// └───────────┘└──────────┘└───────────┘└──────────┘
|
||||
Example::new([Ratio(1, 4); 4]).render(example2, buf);
|
||||
|
||||
// Ratio(1, 2), Ratio(1, 3), Ratio(1, 4)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌───────────────────────┐┌───────────────┐┌──────┐
|
||||
// │ 25 px ││ 17 px ││ 8 px │
|
||||
// └───────────────────────┘└───────────────┘└──────┘
|
||||
Example::new([Ratio(1, 2), Ratio(1, 3), Ratio(1, 4)]).render(example3, buf);
|
||||
|
||||
// Ratio(1, 2), Percentage(25), Length(10)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌───────────────────────┐┌───────────┐┌──────────┐
|
||||
// │ 25 px ││ 13 px ││ 12 px │
|
||||
// └───────────────────────┘└───────────┘└──────────┘
|
||||
Example::new([Ratio(1, 2), Percentage(25), Length(10)]).render(example4, buf);
|
||||
Example::new(&[Ratio(1, 2); 2]).render(example1, buf);
|
||||
Example::new(&[Ratio(1, 4); 4]).render(example2, buf);
|
||||
Example::new(&[Ratio(1, 2), Ratio(1, 3), Ratio(1, 4)]).render(example3, buf);
|
||||
Example::new(&[Ratio(1, 2), Percentage(25), Length(10)]).render(example4, buf);
|
||||
}
|
||||
|
||||
fn render_proportional_example(&self, area: Rect, buf: &mut Buffer) {
|
||||
let [example1, example2, _] = area.split(&Layout::vertical([Fixed(8); 3]));
|
||||
let [example1, example2, _] = area.split(&Layout::vertical([Fixed(EXAMPLE_HEIGHT); 3]));
|
||||
|
||||
// Proportional(1), Proportional(2), Proportional(3)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌──────┐┌───────────────┐┌───────────────────────┐
|
||||
// │ 8 px ││ 17 px ││ 25 px │
|
||||
// └──────┘└───────────────┘└───────────────────────┘
|
||||
Example::new([Proportional(1), Proportional(2), Proportional(3)]).render(example1, buf);
|
||||
|
||||
// Proportional(1), Percentage(50), Proportional(1)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌───────────┐┌───────────────────────┐┌──────────┐
|
||||
// │ 13 px ││ 25 px ││ 12 px │
|
||||
// └───────────┘└───────────────────────┘└──────────┘
|
||||
Example::new([Proportional(1), Percentage(50), Proportional(1)]).render(example2, buf);
|
||||
Example::new(&[Proportional(1), Proportional(2), Proportional(3)]).render(example1, buf);
|
||||
Example::new(&[Proportional(1), Percentage(50), Proportional(1)]).render(example2, buf);
|
||||
}
|
||||
|
||||
fn render_min_example(&self, area: Rect, buf: &mut Buffer) {
|
||||
let [example1, example2, example3, example4, example5, _] =
|
||||
area.split(&Layout::vertical([Fixed(8); 6]));
|
||||
// Percentage(100), Min(0)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────────────────────────┐
|
||||
// │ 50 px │
|
||||
// └────────────────────────────────────────────────┘
|
||||
Example::new([Percentage(100), Min(0)]).render(example1, buf);
|
||||
area.split(&Layout::vertical([Fixed(EXAMPLE_HEIGHT); 6]));
|
||||
|
||||
// Percentage(100), Min(20)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────┐┌──────────────────┐
|
||||
// │ 30 px ││ 20 px │
|
||||
// └────────────────────────────┘└──────────────────┘
|
||||
Example::new([Percentage(100), Min(20)]).render(example2, buf);
|
||||
|
||||
// Percentage(100), Min(40)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────┐┌──────────────────────────────────────┐
|
||||
// │ 10 px ││ 40 px │
|
||||
// └────────┘└──────────────────────────────────────┘
|
||||
Example::new([Percentage(100), Min(40)]).render(example3, buf);
|
||||
|
||||
// Percentage(100), Min(60)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────────────────────────┐
|
||||
// │ 50 px │
|
||||
// └────────────────────────────────────────────────┘
|
||||
Example::new([Percentage(100), Min(60)]).render(example4, buf);
|
||||
|
||||
// Percentage(100), Min(80)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────────────────────────┐
|
||||
// │ 50 px │
|
||||
// └────────────────────────────────────────────────┘
|
||||
Example::new([Percentage(100), Min(80)]).render(example5, buf);
|
||||
Example::new(&[Percentage(100), Min(0)]).render(example1, buf);
|
||||
Example::new(&[Percentage(100), Min(20)]).render(example2, buf);
|
||||
Example::new(&[Percentage(100), Min(40)]).render(example3, buf);
|
||||
Example::new(&[Percentage(100), Min(60)]).render(example4, buf);
|
||||
Example::new(&[Percentage(100), Min(80)]).render(example5, buf);
|
||||
}
|
||||
|
||||
fn render_max_example(&self, area: Rect, buf: &mut Buffer) {
|
||||
let [example1, example2, example3, example4, example5, _] =
|
||||
area.split(&Layout::vertical([Fixed(8); 6]));
|
||||
area.split(&Layout::vertical([Fixed(EXAMPLE_HEIGHT); 6]));
|
||||
|
||||
// Percentage(0), Max(0)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────────────────────────┐
|
||||
// │ 50 px │
|
||||
// └────────────────────────────────────────────────┘
|
||||
Example::new([Percentage(0), Max(0)]).render(example1, buf);
|
||||
|
||||
//
|
||||
// Percentage(0), Max(20)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────┐┌──────────────────┐
|
||||
// │ 30 px ││ 20 px │
|
||||
// └────────────────────────────┘└──────────────────┘
|
||||
Example::new([Percentage(0), Max(20)]).render(example2, buf);
|
||||
|
||||
// Percentage(0), Max(40)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────┐┌──────────────────────────────────────┐
|
||||
// │ 10 px ││ 40 px │
|
||||
// └────────┘└──────────────────────────────────────┘
|
||||
Example::new([Percentage(0), Max(40)]).render(example3, buf);
|
||||
|
||||
// Percentage(0), Max(60)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────────────────────────┐
|
||||
// │ 50 px │
|
||||
// └────────────────────────────────────────────────┘
|
||||
Example::new([Percentage(0), Max(60)]).render(example4, buf);
|
||||
|
||||
// Percentage(0), Max(80)
|
||||
//
|
||||
// <---------------------50 px---------------------->
|
||||
//
|
||||
// ┌────────────────────────────────────────────────┐
|
||||
// │ 50 px │
|
||||
// └────────────────────────────────────────────────┘
|
||||
Example::new([Percentage(0), Max(80)]).render(example5, buf);
|
||||
Example::new(&[Percentage(0), Max(0)]).render(example1, buf);
|
||||
Example::new(&[Percentage(0), Max(20)]).render(example2, buf);
|
||||
Example::new(&[Percentage(0), Max(40)]).render(example3, buf);
|
||||
Example::new(&[Percentage(0), Max(60)]).render(example4, buf);
|
||||
Example::new(&[Percentage(0), Max(80)]).render(example5, buf);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -438,10 +377,7 @@ struct Example {
|
|||
}
|
||||
|
||||
impl Example {
|
||||
fn new<C>(constraints: C) -> Self
|
||||
where
|
||||
C: Into<Vec<Constraint>>,
|
||||
{
|
||||
fn new(constraints: &[Constraint]) -> Self {
|
||||
Self {
|
||||
constraints: constraints.into(),
|
||||
}
|
||||
|
|
@ -450,53 +386,69 @@ impl Example {
|
|||
|
||||
impl Widget for Example {
|
||||
fn render(self, area: Rect, buf: &mut Buffer) {
|
||||
let [title, legend, area] = area.split(&Layout::vertical([Ratio(1, 3); 3]));
|
||||
let [area, _] = area.split(&Layout::vertical([
|
||||
Fixed(ILLUSTRATION_HEIGHT),
|
||||
Fixed(SPACER_HEIGHT),
|
||||
]));
|
||||
let blocks = Layout::horizontal(&self.constraints).split(area);
|
||||
|
||||
self.heading().render(title, buf);
|
||||
|
||||
self.legend(legend.width as usize).render(legend, buf);
|
||||
|
||||
for (i, block) in blocks.iter().enumerate() {
|
||||
let text = format!("{} px", block.width);
|
||||
let fg = Color::Indexed(i as u8 + 1);
|
||||
self.illustration(text, fg).render(*block, buf);
|
||||
for (block, constraint) in blocks.iter().zip(&self.constraints) {
|
||||
self.illustration(*constraint, block.width)
|
||||
.render(*block, buf);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Example {
|
||||
fn heading(&self) -> Paragraph {
|
||||
// Renders the following
|
||||
//
|
||||
// Fixed(40), Proportional(0)
|
||||
let spans = self.constraints.iter().enumerate().map(|(i, c)| {
|
||||
let color = Color::Indexed(i as u8 + 1);
|
||||
Span::styled(format!("{:?}", c), color)
|
||||
});
|
||||
let heading =
|
||||
Line::from(Itertools::intersperse(spans, Span::raw(", ")).collect::<Vec<Span>>());
|
||||
Paragraph::new(heading).block(Block::default().padding(Padding::vertical(1)))
|
||||
}
|
||||
|
||||
fn legend(&self, width: usize) -> Paragraph {
|
||||
// a bar like `<----- 80 px ----->`
|
||||
let width_label = format!("{} px", width);
|
||||
let width_bar = format!(
|
||||
"<{width_label:-^width$}>",
|
||||
width = width - width_label.len() / 2
|
||||
);
|
||||
Paragraph::new(width_bar.dark_gray()).alignment(Alignment::Center)
|
||||
}
|
||||
|
||||
fn illustration(&self, text: String, fg: Color) -> Paragraph {
|
||||
// Renders the following
|
||||
//
|
||||
// ┌─────────┐┌─────────┐
|
||||
// │ 40 px ││ 40 px │
|
||||
// └─────────┘└─────────┘
|
||||
fn illustration(&self, constraint: Constraint, width: u16) -> Paragraph {
|
||||
let color = match constraint {
|
||||
Constraint::Fixed(_) => FIXED_COLOR,
|
||||
Constraint::Length(_) => LENGTH_COLOR,
|
||||
Constraint::Percentage(_) => PERCENTAGE_COLOR,
|
||||
Constraint::Ratio(_, _) => RATIO_COLOR,
|
||||
Constraint::Proportional(_) => PROPORTIONAL_COLOR,
|
||||
Constraint::Min(_) => MIN_COLOR,
|
||||
Constraint::Max(_) => MAX_COLOR,
|
||||
};
|
||||
let fg = Color::White;
|
||||
let title = format!("{constraint}");
|
||||
let content = format!("{width} px");
|
||||
let text = format!("{title}\n{content}");
|
||||
let block = Block::bordered()
|
||||
.border_set(symbols::border::QUADRANT_OUTSIDE)
|
||||
.border_style(Style::reset().fg(color).reversed())
|
||||
.style(Style::default().fg(fg).bg(color));
|
||||
Paragraph::new(text)
|
||||
.alignment(Alignment::Center)
|
||||
.block(Block::bordered().style(Style::default().fg(fg)))
|
||||
.block(block)
|
||||
}
|
||||
}
|
||||
|
||||
fn init_error_hooks() -> Result<()> {
|
||||
let (panic, error) = HookBuilder::default().into_hooks();
|
||||
let panic = panic.into_panic_hook();
|
||||
let error = error.into_eyre_hook();
|
||||
color_eyre::eyre::set_hook(Box::new(move |e| {
|
||||
let _ = restore_terminal();
|
||||
error(e)
|
||||
}))?;
|
||||
std::panic::set_hook(Box::new(move |info| {
|
||||
let _ = restore_terminal();
|
||||
panic(info)
|
||||
}));
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn init_terminal() -> Result<Terminal<impl Backend>> {
|
||||
enable_raw_mode()?;
|
||||
stdout().execute(EnterAlternateScreen)?;
|
||||
let backend = CrosstermBackend::new(stdout());
|
||||
let terminal = Terminal::new(backend)?;
|
||||
Ok(terminal)
|
||||
}
|
||||
|
||||
fn restore_terminal() -> Result<()> {
|
||||
disable_raw_mode()?;
|
||||
stdout().execute(LeaveAlternateScreen)?;
|
||||
Ok(())
|
||||
}
|
||||
|
|
|
|||
|
|
@ -4,7 +4,7 @@ Output "target/constraints.gif"
|
|||
Set Theme "Aardvark Blue"
|
||||
Set FontSize 18
|
||||
Set Width 1200
|
||||
Set Height 1200
|
||||
Set Height 700
|
||||
Hide
|
||||
Type "cargo run --example=constraints --features=crossterm"
|
||||
Enter
|
||||
|
|
|
|||
665
examples/flex.rs
665
examples/flex.rs
|
|
@ -1,160 +1,91 @@
|
|||
use std::{error::Error, io};
|
||||
use std::io::{self, stdout};
|
||||
|
||||
use color_eyre::{config::HookBuilder, Result};
|
||||
use crossterm::{
|
||||
event::{self, Event, KeyCode},
|
||||
execute,
|
||||
event::{self, Event, KeyCode, KeyEventKind},
|
||||
terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
|
||||
ExecutableCommand,
|
||||
};
|
||||
use ratatui::{
|
||||
layout::{Constraint::*, Flex},
|
||||
prelude::*,
|
||||
style::palette::tailwind,
|
||||
widgets::{block::Title, *},
|
||||
};
|
||||
use strum::{Display, EnumIter, FromRepr, IntoEnumIterator};
|
||||
|
||||
const EXAMPLE_HEIGHT: u16 = 5;
|
||||
const N_EXAMPLES_PER_TAB: u16 = 11;
|
||||
|
||||
fn main() -> Result<(), Box<dyn Error>> {
|
||||
// setup terminal
|
||||
enable_raw_mode()?;
|
||||
let mut stdout = io::stdout();
|
||||
execute!(stdout, EnterAlternateScreen)?;
|
||||
let backend = CrosstermBackend::new(stdout);
|
||||
let mut terminal = Terminal::new(backend)?;
|
||||
|
||||
// Each line in the example is a layout
|
||||
// so EXAMPLE_HEIGHT * N_EXAMPLES_PER_TAB = 55 currently
|
||||
// Plus additional layout for tabs ...
|
||||
Layout::init_cache(50);
|
||||
|
||||
// create app and run it
|
||||
let res = run_app(&mut terminal);
|
||||
|
||||
// restore terminal
|
||||
disable_raw_mode()?;
|
||||
execute!(terminal.backend_mut(), LeaveAlternateScreen)?;
|
||||
terminal.show_cursor()?;
|
||||
|
||||
if let Err(err) = res {
|
||||
println!("{err:?}");
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn run_app<B: Backend>(terminal: &mut Terminal<B>) -> io::Result<()> {
|
||||
// we always want to show the last example when scrolling
|
||||
let mut app = App::default().max_scroll_offset((N_EXAMPLES_PER_TAB - 1) * EXAMPLE_HEIGHT);
|
||||
|
||||
loop {
|
||||
terminal.draw(|f| f.render_widget(app, f.size()))?;
|
||||
|
||||
if let Event::Key(key) = event::read()? {
|
||||
use KeyCode::*;
|
||||
match key.code {
|
||||
Char('q') => break Ok(()),
|
||||
Char('l') | Right => app.next(),
|
||||
Char('h') | Left => app.previous(),
|
||||
Char('j') | Down => app.down(),
|
||||
Char('k') | Up => app.up(),
|
||||
_ => (),
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
const EXAMPLE_DATA: &[(&str, &[Constraint])] = &[
|
||||
(
|
||||
"Min(u16) takes any excess space when using `Stretch` or `StretchLast`",
|
||||
&[Fixed(20), Min(20), Max(20)],
|
||||
),
|
||||
(
|
||||
"Proportional(u16) takes any excess space in all `Flex` layouts",
|
||||
&[Length(20), Percentage(20), Ratio(1, 5), Proportional(1)],
|
||||
),
|
||||
(
|
||||
"In `StretchLast`, last constraint of lowest priority takes excess space",
|
||||
&[Length(20), Fixed(20), Percentage(20)],
|
||||
),
|
||||
("", &[Fixed(20), Percentage(20), Length(20)]),
|
||||
("", &[Percentage(20), Length(20), Fixed(20)]),
|
||||
("", &[Length(20), Length(15)]),
|
||||
("", &[Length(20), Fixed(20)]),
|
||||
(
|
||||
"When not using `Flex::Stretch` or `Flex::StretchLast`,\n`Min(u16)` and `Max(u16)` collapse to their lowest values",
|
||||
&[Min(20), Max(20)],
|
||||
),
|
||||
(
|
||||
"`SpaceBetween` stretches when there's only one constraint",
|
||||
&[Max(20)],
|
||||
),
|
||||
("", &[Min(20), Max(20), Length(20), Fixed(20)]),
|
||||
("`Proportional(u16)` always fills up space in every `Flex` layout", &[Proportional(0), Proportional(0)]),
|
||||
(
|
||||
"`Proportional(1)` can be to scale with respect to other `Proportional(2)`",
|
||||
&[Proportional(1), Proportional(2)],
|
||||
),
|
||||
(
|
||||
"`Proportional(0)` collapses if there are other non-zero `Proportional(_)`\nconstraints. e.g. `[Proportional(0), Proportional(0), Proportional(1)]`:",
|
||||
&[
|
||||
Proportional(0),
|
||||
Proportional(0),
|
||||
Proportional(1),
|
||||
],
|
||||
),
|
||||
];
|
||||
|
||||
#[derive(Default, Clone, Copy)]
|
||||
struct App {
|
||||
selected_example: ExampleSelection,
|
||||
selected_tab: SelectedTab,
|
||||
scroll_offset: u16,
|
||||
max_scroll_offset: u16,
|
||||
state: AppState,
|
||||
}
|
||||
|
||||
impl App {
|
||||
fn max_scroll_offset(mut self, max_scroll_offset: u16) -> Self {
|
||||
self.max_scroll_offset = max_scroll_offset;
|
||||
self
|
||||
}
|
||||
fn next(&mut self) {
|
||||
self.selected_example = self.selected_example.next();
|
||||
}
|
||||
fn previous(&mut self) {
|
||||
self.selected_example = self.selected_example.previous();
|
||||
}
|
||||
fn up(&mut self) {
|
||||
self.scroll_offset = self.scroll_offset.saturating_sub(1)
|
||||
}
|
||||
fn down(&mut self) {
|
||||
self.scroll_offset = self
|
||||
.scroll_offset
|
||||
.saturating_add(1)
|
||||
.min(self.max_scroll_offset)
|
||||
}
|
||||
|
||||
fn render_tabs(&self, area: Rect, buf: &mut Buffer) {
|
||||
Tabs::new(
|
||||
[
|
||||
ExampleSelection::Stretch,
|
||||
ExampleSelection::StretchLast,
|
||||
ExampleSelection::Start,
|
||||
ExampleSelection::Center,
|
||||
ExampleSelection::End,
|
||||
ExampleSelection::SpaceAround,
|
||||
ExampleSelection::SpaceBetween,
|
||||
]
|
||||
.iter()
|
||||
.map(|e| format!("{:?}", e)),
|
||||
)
|
||||
.block(
|
||||
Block::bordered()
|
||||
.title(Title::from("Flex Layouts ".bold()))
|
||||
.title(" Use h l or ◄ ► to change tab and j k or ▲ ▼ to scroll".bold()),
|
||||
)
|
||||
.highlight_style(Style::default().yellow().bold())
|
||||
.select(self.selected_example.selected())
|
||||
.padding(" ", " ")
|
||||
.render(area, buf);
|
||||
}
|
||||
}
|
||||
|
||||
impl Widget for App {
|
||||
fn render(self, area: Rect, buf: &mut Buffer) {
|
||||
let [tabs_area, demo_area] = area.split(&Layout::vertical([Fixed(3), Proportional(0)]));
|
||||
|
||||
// render demo content into a separate buffer so all examples fit
|
||||
let mut demo_buf = Buffer::empty(Rect::new(
|
||||
0,
|
||||
0,
|
||||
buf.area.width,
|
||||
N_EXAMPLES_PER_TAB * EXAMPLE_HEIGHT,
|
||||
));
|
||||
|
||||
self.selected_example.render(demo_buf.area, &mut demo_buf);
|
||||
|
||||
// render tabs into a separate buffer
|
||||
let mut tabs_buf = Buffer::empty(tabs_area);
|
||||
self.render_tabs(tabs_area, &mut tabs_buf);
|
||||
|
||||
// Assemble both buffers
|
||||
// NOTE: You shouldn't do this in a production app
|
||||
buf.content = tabs_buf.content;
|
||||
buf.content.append(
|
||||
&mut demo_buf
|
||||
.content
|
||||
.into_iter()
|
||||
.skip((buf.area.width * self.scroll_offset) as usize)
|
||||
.take(demo_area.area() as usize)
|
||||
.collect(),
|
||||
);
|
||||
buf.resize(buf.area);
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Default, Debug, Copy, Clone)]
|
||||
enum ExampleSelection {
|
||||
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
|
||||
enum AppState {
|
||||
#[default]
|
||||
Running,
|
||||
Quit,
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone, PartialEq, Eq)]
|
||||
struct Example {
|
||||
constraints: Vec<Constraint>,
|
||||
description: String,
|
||||
flex: Flex,
|
||||
}
|
||||
|
||||
/// Tabs for the different layouts
|
||||
///
|
||||
/// Note: the order of the variants will determine the order of the tabs this uses several derive
|
||||
/// macros from the `strum` crate to make it easier to iterate over the variants.
|
||||
/// (`FromRepr`,`Display`,`EnumIter`).
|
||||
#[derive(Default, Debug, Copy, Clone, PartialEq, Eq, FromRepr, Display, EnumIter)]
|
||||
enum SelectedTab {
|
||||
#[default]
|
||||
Stretch,
|
||||
StretchLast,
|
||||
Stretch,
|
||||
Start,
|
||||
Center,
|
||||
End,
|
||||
|
|
@ -162,148 +93,139 @@ enum ExampleSelection {
|
|||
SpaceBetween,
|
||||
}
|
||||
|
||||
impl ExampleSelection {
|
||||
fn previous(&self) -> Self {
|
||||
use ExampleSelection::*;
|
||||
match *self {
|
||||
Stretch => Stretch,
|
||||
StretchLast => Stretch,
|
||||
Start => StretchLast,
|
||||
Center => Start,
|
||||
End => Center,
|
||||
SpaceAround => End,
|
||||
SpaceBetween => SpaceAround,
|
||||
fn main() -> Result<()> {
|
||||
init_error_hooks()?;
|
||||
let terminal = init_terminal()?;
|
||||
|
||||
// Each line in the example is a layout
|
||||
// so 13 examples * 7 = 91 currently
|
||||
// Plus additional layout for tabs ...
|
||||
Layout::init_cache(120);
|
||||
|
||||
App::default().run(terminal)?;
|
||||
|
||||
restore_terminal()?;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
impl App {
|
||||
fn run(&mut self, mut terminal: Terminal<impl Backend>) -> Result<()> {
|
||||
self.draw(&mut terminal)?;
|
||||
while self.is_running() {
|
||||
self.handle_events()?;
|
||||
self.draw(&mut terminal)?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn next(&self) -> Self {
|
||||
use ExampleSelection::*;
|
||||
match *self {
|
||||
Stretch => StretchLast,
|
||||
StretchLast => Start,
|
||||
Start => Center,
|
||||
Center => End,
|
||||
End => SpaceAround,
|
||||
SpaceAround => SpaceBetween,
|
||||
SpaceBetween => SpaceBetween,
|
||||
}
|
||||
fn is_running(&self) -> bool {
|
||||
self.state == AppState::Running
|
||||
}
|
||||
|
||||
fn selected(&self) -> usize {
|
||||
use ExampleSelection::*;
|
||||
match self {
|
||||
Stretch => 0,
|
||||
StretchLast => 1,
|
||||
Start => 2,
|
||||
Center => 3,
|
||||
End => 4,
|
||||
SpaceAround => 5,
|
||||
SpaceBetween => 6,
|
||||
fn draw(self, terminal: &mut Terminal<impl Backend>) -> io::Result<()> {
|
||||
terminal.draw(|frame| frame.render_widget(self, frame.size()))?;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn handle_events(&mut self) -> Result<()> {
|
||||
use KeyCode::*;
|
||||
match event::read()? {
|
||||
Event::Key(key) if key.kind == KeyEventKind::Press => match key.code {
|
||||
Char('q') | Esc => self.quit(),
|
||||
Char('l') | Right => self.next(),
|
||||
Char('h') | Left => self.previous(),
|
||||
Char('j') | Down => self.down(),
|
||||
Char('k') | Up => self.up(),
|
||||
Char('g') | Home => self.top(),
|
||||
Char('G') | End => self.bottom(),
|
||||
_ => (),
|
||||
},
|
||||
_ => {}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn next(&mut self) {
|
||||
self.selected_tab = self.selected_tab.next();
|
||||
}
|
||||
|
||||
fn previous(&mut self) {
|
||||
self.selected_tab = self.selected_tab.previous();
|
||||
}
|
||||
|
||||
fn up(&mut self) {
|
||||
self.scroll_offset = self.scroll_offset.saturating_sub(1)
|
||||
}
|
||||
|
||||
fn down(&mut self) {
|
||||
self.scroll_offset = self
|
||||
.scroll_offset
|
||||
.saturating_add(1)
|
||||
.min(max_scroll_offset())
|
||||
}
|
||||
|
||||
fn top(&mut self) {
|
||||
self.scroll_offset = 0;
|
||||
}
|
||||
|
||||
fn bottom(&mut self) {
|
||||
self.scroll_offset = max_scroll_offset();
|
||||
}
|
||||
|
||||
fn quit(&mut self) {
|
||||
self.state = AppState::Quit;
|
||||
}
|
||||
}
|
||||
|
||||
impl Widget for ExampleSelection {
|
||||
// when scrolling, make sure we don't scroll past the last example
|
||||
fn max_scroll_offset() -> u16 {
|
||||
example_height()
|
||||
- EXAMPLE_DATA
|
||||
.last()
|
||||
.map(|(desc, _)| get_description_height(desc) + 4)
|
||||
.unwrap_or(0)
|
||||
}
|
||||
|
||||
/// The height of all examples combined
|
||||
///
|
||||
/// Each may or may not have a title so we need to account for that.
|
||||
fn example_height() -> u16 {
|
||||
EXAMPLE_DATA
|
||||
.iter()
|
||||
.map(|(desc, _)| get_description_height(desc) + 4)
|
||||
.sum()
|
||||
}
|
||||
|
||||
impl Widget for App {
|
||||
fn render(self, area: Rect, buf: &mut Buffer) {
|
||||
match self {
|
||||
ExampleSelection::Stretch => self.render_example(area, buf, Flex::Stretch),
|
||||
ExampleSelection::StretchLast => self.render_example(area, buf, Flex::StretchLast),
|
||||
ExampleSelection::Start => self.render_example(area, buf, Flex::Start),
|
||||
ExampleSelection::Center => self.render_example(area, buf, Flex::Center),
|
||||
ExampleSelection::End => self.render_example(area, buf, Flex::End),
|
||||
ExampleSelection::SpaceAround => self.render_example(area, buf, Flex::SpaceAround),
|
||||
ExampleSelection::SpaceBetween => self.render_example(area, buf, Flex::SpaceBetween),
|
||||
}
|
||||
let layout = Layout::vertical([Fixed(3), Fixed(3), Proportional(0)]);
|
||||
let [tabs, axis, demo] = area.split(&layout);
|
||||
self.tabs().render(tabs, buf);
|
||||
self.axis(axis.width).render(axis, buf);
|
||||
self.render_demo(demo, buf);
|
||||
}
|
||||
}
|
||||
|
||||
impl ExampleSelection {
|
||||
fn render_example(&self, area: Rect, buf: &mut Buffer, flex: Flex) {
|
||||
let areas = &Layout::vertical([Fixed(EXAMPLE_HEIGHT); N_EXAMPLES_PER_TAB as usize])
|
||||
.flex(Flex::Start)
|
||||
.split(area);
|
||||
|
||||
let examples = [
|
||||
vec![Length(20), Fixed(20), Percentage(20)],
|
||||
vec![Fixed(20), Percentage(20), Length(20)],
|
||||
vec![Percentage(20), Length(20), Fixed(20)],
|
||||
vec![Length(20), Length(15)],
|
||||
vec![Length(20), Fixed(20)],
|
||||
vec![Min(20), Max(20)],
|
||||
vec![Max(20)],
|
||||
vec![Min(20), Max(20), Length(20), Fixed(20)],
|
||||
vec![Proportional(0), Proportional(0)],
|
||||
vec![Proportional(1), Proportional(1), Length(20), Fixed(20)],
|
||||
vec![
|
||||
Min(10),
|
||||
Proportional(3),
|
||||
Proportional(2),
|
||||
Length(15),
|
||||
Fixed(15),
|
||||
],
|
||||
];
|
||||
|
||||
for (area, constraints) in areas.iter().zip(examples) {
|
||||
Example::new(constraints).flex(flex).render(*area, buf);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
struct Example {
|
||||
constraints: Vec<Constraint>,
|
||||
flex: Flex,
|
||||
}
|
||||
|
||||
impl Example {
|
||||
fn new<C>(constraints: C) -> Self
|
||||
where
|
||||
C: Into<Vec<Constraint>>,
|
||||
{
|
||||
Self {
|
||||
constraints: constraints.into(),
|
||||
flex: Flex::default(),
|
||||
}
|
||||
impl App {
|
||||
fn tabs(&self) -> impl Widget {
|
||||
let tab_titles = SelectedTab::iter().map(SelectedTab::to_tab_title);
|
||||
let block = Block::new()
|
||||
.title(Title::from("Flex Layouts ".bold()))
|
||||
.title(" Use h l or ◄ ► to change tab and j k or ▲ ▼ to scroll");
|
||||
Tabs::new(tab_titles)
|
||||
.block(block)
|
||||
.highlight_style(Modifier::REVERSED)
|
||||
.select(self.selected_tab as usize)
|
||||
.divider(" ")
|
||||
.padding("", "")
|
||||
}
|
||||
|
||||
fn flex(mut self, flex: Flex) -> Self {
|
||||
self.flex = flex;
|
||||
self
|
||||
}
|
||||
}
|
||||
|
||||
impl Widget for Example {
|
||||
fn render(self, area: Rect, buf: &mut Buffer) {
|
||||
let [legend, area] = area.split(&Layout::vertical([Ratio(1, 3); 2]));
|
||||
let blocks = Layout::horizontal(&self.constraints)
|
||||
.flex(self.flex)
|
||||
.split(area);
|
||||
|
||||
self.legend(legend.width as usize).render(legend, buf);
|
||||
|
||||
for (block, constraint) in blocks.iter().zip(&self.constraints) {
|
||||
let text = format!("{} px", block.width);
|
||||
let fg = match constraint {
|
||||
Constraint::Ratio(_, _) => Color::Indexed(1),
|
||||
Constraint::Percentage(_) => Color::Indexed(2),
|
||||
Constraint::Max(_) => Color::Indexed(3),
|
||||
Constraint::Min(_) => Color::Indexed(4),
|
||||
Constraint::Length(_) => Color::Indexed(5),
|
||||
Constraint::Fixed(_) => Color::Indexed(6),
|
||||
Constraint::Proportional(_) => Color::Indexed(7),
|
||||
};
|
||||
self.illustration(*constraint, text, fg).render(*block, buf);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Example {
|
||||
fn legend(&self, width: usize) -> Paragraph {
|
||||
// a bar like `<----- 80 px ----->`
|
||||
let width_label = format!("{} px", width);
|
||||
let width_bar = format!(
|
||||
"<{width_label:-^width$}>",
|
||||
width = width - width_label.len() / 2
|
||||
);
|
||||
/// a bar like `<----- 80 px ----->`
|
||||
fn axis(&self, width: u16) -> impl Widget {
|
||||
let width = width as usize;
|
||||
let label = format!("{} px", width);
|
||||
let bar_width = width - label.len() / 2;
|
||||
let width_bar = format!("<{label:-^bar_width$}>",);
|
||||
Paragraph::new(width_bar.dark_gray())
|
||||
.alignment(Alignment::Center)
|
||||
.block(Block::default().padding(Padding {
|
||||
|
|
@ -314,13 +236,208 @@ impl Example {
|
|||
}))
|
||||
}
|
||||
|
||||
fn illustration(&self, constraint: Constraint, text: String, fg: Color) -> Paragraph {
|
||||
Paragraph::new(format!("{:?}", constraint))
|
||||
.alignment(Alignment::Center)
|
||||
.block(
|
||||
Block::bordered()
|
||||
.style(Style::default().fg(fg))
|
||||
.title(block::Title::from(text).alignment(Alignment::Center)),
|
||||
)
|
||||
/// Render the demo content
|
||||
///
|
||||
/// This function renders the demo content into a separate buffer and then splices the buffer
|
||||
/// into the main buffer. This is done to make it possible to handle scrolling easily.
|
||||
fn render_demo(self, area: Rect, buf: &mut Buffer) {
|
||||
// render demo content into a separate buffer so all examples fit we add an extra
|
||||
// area.height to make sure the last example is fully visible even when the scroll offset is
|
||||
// at the max
|
||||
let height = example_height();
|
||||
let demo_area = Rect::new(0, 0, area.width, height);
|
||||
let mut demo_buf = Buffer::empty(demo_area);
|
||||
|
||||
let scrollbar_needed = self.scroll_offset != 0 || height > area.height;
|
||||
let content_area = if scrollbar_needed {
|
||||
Rect {
|
||||
width: demo_area.width - 1,
|
||||
..demo_area
|
||||
}
|
||||
} else {
|
||||
demo_area
|
||||
};
|
||||
self.selected_tab.render(content_area, &mut demo_buf);
|
||||
|
||||
let visible_content = demo_buf
|
||||
.content
|
||||
.into_iter()
|
||||
.skip((area.width * self.scroll_offset) as usize)
|
||||
.take(area.area() as usize);
|
||||
for (i, cell) in visible_content.enumerate() {
|
||||
let x = i as u16 % area.width;
|
||||
let y = i as u16 / area.width;
|
||||
*buf.get_mut(area.x + x, area.y + y) = cell;
|
||||
}
|
||||
|
||||
if scrollbar_needed {
|
||||
let area = area.intersection(buf.area);
|
||||
let mut state = ScrollbarState::new(max_scroll_offset() as usize)
|
||||
.position(self.scroll_offset as usize);
|
||||
Scrollbar::new(ScrollbarOrientation::VerticalRight).render(area, buf, &mut state);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl SelectedTab {
|
||||
/// Get the previous tab, if there is no previous tab return the current tab.
|
||||
fn previous(&self) -> Self {
|
||||
let current_index: usize = *self as usize;
|
||||
let previous_index = current_index.saturating_sub(1);
|
||||
Self::from_repr(previous_index).unwrap_or(*self)
|
||||
}
|
||||
|
||||
/// Get the next tab, if there is no next tab return the current tab.
|
||||
fn next(&self) -> Self {
|
||||
let current_index = *self as usize;
|
||||
let next_index = current_index.saturating_add(1);
|
||||
Self::from_repr(next_index).unwrap_or(*self)
|
||||
}
|
||||
|
||||
/// Convert a `SelectedTab` into a `Line` to display it by the `Tabs` widget.
|
||||
fn to_tab_title(value: SelectedTab) -> Line<'static> {
|
||||
use tailwind::*;
|
||||
use SelectedTab::*;
|
||||
let text = value.to_string();
|
||||
let color = match value {
|
||||
StretchLast => ORANGE.c400,
|
||||
Stretch => ORANGE.c300,
|
||||
Start => SKY.c400,
|
||||
Center => SKY.c300,
|
||||
End => SKY.c200,
|
||||
SpaceAround => INDIGO.c400,
|
||||
SpaceBetween => INDIGO.c300,
|
||||
};
|
||||
format!(" {text} ").fg(color).bg(Color::Black).into()
|
||||
}
|
||||
}
|
||||
|
||||
impl Widget for SelectedTab {
|
||||
fn render(self, area: Rect, buf: &mut Buffer) {
|
||||
match self {
|
||||
SelectedTab::StretchLast => self.render_examples(area, buf, Flex::StretchLast),
|
||||
SelectedTab::Stretch => self.render_examples(area, buf, Flex::Stretch),
|
||||
SelectedTab::Start => self.render_examples(area, buf, Flex::Start),
|
||||
SelectedTab::Center => self.render_examples(area, buf, Flex::Center),
|
||||
SelectedTab::End => self.render_examples(area, buf, Flex::End),
|
||||
SelectedTab::SpaceAround => self.render_examples(area, buf, Flex::SpaceAround),
|
||||
SelectedTab::SpaceBetween => self.render_examples(area, buf, Flex::SpaceBetween),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl SelectedTab {
|
||||
fn render_examples(&self, area: Rect, buf: &mut Buffer, flex: Flex) {
|
||||
let heights = EXAMPLE_DATA
|
||||
.iter()
|
||||
.map(|(desc, _)| get_description_height(desc) + 4);
|
||||
let areas = Layout::vertical(heights).flex(Flex::Start).split(area);
|
||||
for (area, (description, constraints)) in areas.iter().zip(EXAMPLE_DATA.iter()) {
|
||||
Example::new(constraints, description, flex).render(*area, buf);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Example {
|
||||
fn new(constraints: &[Constraint], description: &str, flex: Flex) -> Self {
|
||||
Self {
|
||||
constraints: constraints.into(),
|
||||
description: description.into(),
|
||||
flex,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Widget for Example {
|
||||
fn render(self, area: Rect, buf: &mut Buffer) {
|
||||
let title_height = get_description_height(&self.description);
|
||||
let layout = Layout::vertical([Fixed(title_height), Proportional(0)]);
|
||||
let [title, illustrations] = area.split(&layout);
|
||||
let blocks = Layout::horizontal(&self.constraints)
|
||||
.flex(self.flex)
|
||||
.split(illustrations);
|
||||
|
||||
if !self.description.is_empty() {
|
||||
Paragraph::new(
|
||||
self.description
|
||||
.split('\n')
|
||||
.map(|s| format!("// {}", s).italic().fg(tailwind::SLATE.c400))
|
||||
.map(Line::from)
|
||||
.collect::<Vec<Line>>(),
|
||||
)
|
||||
.render(title, buf);
|
||||
}
|
||||
|
||||
for (block, constraint) in blocks.iter().zip(&self.constraints) {
|
||||
self.illustration(*constraint, block.width)
|
||||
.render(*block, buf);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Example {
|
||||
fn illustration(&self, constraint: Constraint, width: u16) -> Paragraph {
|
||||
let main_color = color_for_constraint(constraint);
|
||||
let fg_color = Color::White;
|
||||
let title = format!("{constraint}");
|
||||
let content = format!("{width} px");
|
||||
let text = format!("{title}\n{content}");
|
||||
let block = Block::bordered()
|
||||
.border_set(symbols::border::QUADRANT_OUTSIDE)
|
||||
.border_style(Style::reset().fg(main_color).reversed())
|
||||
.style(Style::default().fg(fg_color).bg(main_color));
|
||||
Paragraph::new(text)
|
||||
.alignment(Alignment::Center)
|
||||
.block(block)
|
||||
}
|
||||
}
|
||||
|
||||
fn color_for_constraint(constraint: Constraint) -> Color {
|
||||
use tailwind::*;
|
||||
match constraint {
|
||||
Constraint::Fixed(_) => RED.c900,
|
||||
Constraint::Min(_) => BLUE.c900,
|
||||
Constraint::Max(_) => BLUE.c800,
|
||||
Constraint::Length(_) => SLATE.c700,
|
||||
Constraint::Percentage(_) => SLATE.c800,
|
||||
Constraint::Ratio(_, _) => SLATE.c900,
|
||||
Constraint::Proportional(_) => SLATE.c950,
|
||||
}
|
||||
}
|
||||
|
||||
fn init_error_hooks() -> Result<()> {
|
||||
let (panic, error) = HookBuilder::default().into_hooks();
|
||||
let panic = panic.into_panic_hook();
|
||||
let error = error.into_eyre_hook();
|
||||
color_eyre::eyre::set_hook(Box::new(move |e| {
|
||||
let _ = restore_terminal();
|
||||
error(e)
|
||||
}))?;
|
||||
std::panic::set_hook(Box::new(move |info| {
|
||||
let _ = restore_terminal();
|
||||
panic(info)
|
||||
}));
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn init_terminal() -> Result<Terminal<impl Backend>> {
|
||||
enable_raw_mode()?;
|
||||
stdout().execute(EnterAlternateScreen)?;
|
||||
let backend = CrosstermBackend::new(stdout());
|
||||
let terminal = Terminal::new(backend)?;
|
||||
Ok(terminal)
|
||||
}
|
||||
|
||||
fn restore_terminal() -> Result<()> {
|
||||
disable_raw_mode()?;
|
||||
stdout().execute(LeaveAlternateScreen)?;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn get_description_height(s: &str) -> u16 {
|
||||
if s.is_empty() {
|
||||
0
|
||||
} else {
|
||||
s.split('\n').count() as u16
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue