082cbcbc50
This change simplifys UI code that uses the Frame type. E.g.:
```rust
fn draw<B: Backend>(frame: &mut Frame<B>) {
// ...
}
```
Frame was generic over Backend because it stored a reference to the
terminal in the field. Instead it now directly stores the viewport area
and current buffer. These are provided at creation time and are valid
for the duration of the frame.
BREAKING CHANGE: Frame is no longer generic over Backend. Code that
accepted `Frame<Backend>` will now need to accept `Frame`. To migrate
existing code, remove any generic parameters from code that uses an
instance of a Frame. E.g. the above code becomes:
```rust
fn draw(frame: &mut Frame) {
// ...
}
```
72 lines
1.6 KiB
Rust
72 lines
1.6 KiB
Rust
use std::{error::Error, io};
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use crossterm::{
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event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode},
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execute,
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terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
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};
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use ratatui::{prelude::*, widgets::*};
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#[derive(Default)]
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struct Label<'a> {
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text: &'a str,
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}
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impl<'a> Widget for Label<'a> {
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fn render(self, area: Rect, buf: &mut Buffer) {
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buf.set_string(area.left(), area.top(), self.text, Style::default());
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}
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}
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impl<'a> Label<'a> {
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fn text(mut self, text: &'a str) -> Label<'a> {
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self.text = text;
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self
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}
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}
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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, EnableMouseCapture)?;
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let backend = CrosstermBackend::new(stdout);
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let mut terminal = Terminal::new(backend)?;
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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!(
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terminal.backend_mut(),
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LeaveAlternateScreen,
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DisableMouseCapture
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)?;
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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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}
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fn run_app<B: Backend>(terminal: &mut Terminal<B>) -> io::Result<()> {
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loop {
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terminal.draw(ui)?;
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if let Event::Key(key) = event::read()? {
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if let KeyCode::Char('q') = key.code {
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return Ok(());
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}
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}
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}
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}
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fn ui(f: &mut Frame) {
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let size = f.size();
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let label = Label::default().text("Test");
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f.render_widget(label, size);
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}
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