mirror of https://github.com/fdehau/tui-rs
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
329 lines
9.8 KiB
Rust
329 lines
9.8 KiB
Rust
use crate::{
|
|
backend::Backend,
|
|
buffer::Buffer,
|
|
layout::Rect,
|
|
widgets::{StatefulWidget, Widget},
|
|
};
|
|
use std::io;
|
|
|
|
#[derive(Debug, Clone, PartialEq)]
|
|
/// UNSTABLE
|
|
enum ResizeBehavior {
|
|
Fixed,
|
|
Auto,
|
|
}
|
|
|
|
#[derive(Debug, Clone, PartialEq)]
|
|
/// UNSTABLE
|
|
pub struct Viewport {
|
|
area: Rect,
|
|
resize_behavior: ResizeBehavior,
|
|
}
|
|
|
|
impl Viewport {
|
|
/// UNSTABLE
|
|
pub fn fixed(area: Rect) -> Viewport {
|
|
Viewport {
|
|
area,
|
|
resize_behavior: ResizeBehavior::Fixed,
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Clone, PartialEq)]
|
|
/// Options to pass to [`Terminal::with_options`]
|
|
pub struct TerminalOptions {
|
|
/// Viewport used to draw to the terminal
|
|
pub viewport: Viewport,
|
|
}
|
|
|
|
/// Interface to the terminal backed by Termion
|
|
#[derive(Debug)]
|
|
pub struct Terminal<B>
|
|
where
|
|
B: Backend,
|
|
{
|
|
backend: B,
|
|
/// Holds the results of the current and previous draw calls. The two are compared at the end
|
|
/// of each draw pass to output the necessary updates to the terminal
|
|
buffers: [Buffer; 2],
|
|
/// Index of the current buffer in the previous array
|
|
current: usize,
|
|
/// Whether the cursor is currently hidden
|
|
hidden_cursor: bool,
|
|
/// Viewport
|
|
viewport: Viewport,
|
|
}
|
|
|
|
/// Represents a consistent terminal interface for rendering.
|
|
pub struct Frame<'a, B: 'a>
|
|
where
|
|
B: Backend,
|
|
{
|
|
terminal: &'a mut Terminal<B>,
|
|
|
|
/// Where should the cursor be after drawing this frame?
|
|
///
|
|
/// If `None`, the cursor is hidden and its position is controlled by the backend. If `Some((x,
|
|
/// y))`, the cursor is shown and placed at `(x, y)` after the call to `Terminal::draw()`.
|
|
cursor_position: Option<(u16, u16)>,
|
|
}
|
|
|
|
impl<'a, B> Frame<'a, B>
|
|
where
|
|
B: Backend,
|
|
{
|
|
/// Terminal size, guaranteed not to change when rendering.
|
|
pub fn size(&self) -> Rect {
|
|
self.terminal.viewport.area
|
|
}
|
|
|
|
/// Render a [`Widget`] to the current buffer using [`Widget::render`].
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```rust,no_run
|
|
/// # use std::io;
|
|
/// # use tui::Terminal;
|
|
/// # use tui::backend::TermionBackend;
|
|
/// # use tui::layout::Rect;
|
|
/// # use tui::widgets::Block;
|
|
/// # let stdout = io::stdout();
|
|
/// # let backend = TermionBackend::new(stdout);
|
|
/// # let mut terminal = Terminal::new(backend).unwrap();
|
|
/// let block = Block::default();
|
|
/// let area = Rect::new(0, 0, 5, 5);
|
|
/// let mut frame = terminal.get_frame();
|
|
/// frame.render_widget(block, area);
|
|
/// ```
|
|
pub fn render_widget<W>(&mut self, widget: W, area: Rect)
|
|
where
|
|
W: Widget,
|
|
{
|
|
widget.render(area, self.terminal.current_buffer_mut());
|
|
}
|
|
|
|
/// Render a [`StatefulWidget`] to the current buffer using [`StatefulWidget::render`].
|
|
///
|
|
/// The last argument should be an instance of the [`StatefulWidget::State`] associated to the
|
|
/// given [`StatefulWidget`].
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```rust,no_run
|
|
/// # use std::io;
|
|
/// # use tui::Terminal;
|
|
/// # use tui::backend::TermionBackend;
|
|
/// # use tui::layout::Rect;
|
|
/// # use tui::widgets::{List, ListItem, ListState};
|
|
/// # let stdout = io::stdout();
|
|
/// # let backend = TermionBackend::new(stdout);
|
|
/// # let mut terminal = Terminal::new(backend).unwrap();
|
|
/// let mut state = ListState::default();
|
|
/// state.select(Some(1));
|
|
/// let items = vec![
|
|
/// ListItem::new("Item 1"),
|
|
/// ListItem::new("Item 2"),
|
|
/// ];
|
|
/// let list = List::new(items);
|
|
/// let area = Rect::new(0, 0, 5, 5);
|
|
/// let mut frame = terminal.get_frame();
|
|
/// frame.render_stateful_widget(list, area, &mut state);
|
|
/// ```
|
|
pub fn render_stateful_widget<W>(&mut self, widget: W, area: Rect, state: &mut W::State)
|
|
where
|
|
W: StatefulWidget,
|
|
{
|
|
widget.render(area, self.terminal.current_buffer_mut(), state);
|
|
}
|
|
|
|
/// After drawing this frame, make the cursor visible and put it at the specified (x, y)
|
|
/// coordinates. If this method is not called, the cursor will be hidden.
|
|
///
|
|
/// Note that this will interfere with calls to `Terminal::hide_cursor()`,
|
|
/// `Terminal::show_cursor()`, and `Terminal::set_cursor()`. Pick one of the APIs and stick
|
|
/// with it.
|
|
pub fn set_cursor(&mut self, x: u16, y: u16) {
|
|
self.cursor_position = Some((x, y));
|
|
}
|
|
}
|
|
|
|
/// CompletedFrame represents the state of the terminal after all changes performed in the last
|
|
/// [`Terminal::draw`] call have been applied. Therefore, it is only valid until the next call to
|
|
/// [`Terminal::draw`].
|
|
pub struct CompletedFrame<'a> {
|
|
pub buffer: &'a Buffer,
|
|
pub area: Rect,
|
|
}
|
|
|
|
impl<B> Drop for Terminal<B>
|
|
where
|
|
B: Backend,
|
|
{
|
|
fn drop(&mut self) {
|
|
// Attempt to restore the cursor state
|
|
if self.hidden_cursor {
|
|
if let Err(err) = self.show_cursor() {
|
|
eprintln!("Failed to show the cursor: {}", err);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<B> Terminal<B>
|
|
where
|
|
B: Backend,
|
|
{
|
|
/// Wrapper around Terminal initialization. Each buffer is initialized with a blank string and
|
|
/// default colors for the foreground and the background
|
|
pub fn new(backend: B) -> io::Result<Terminal<B>> {
|
|
let size = backend.size()?;
|
|
Terminal::with_options(
|
|
backend,
|
|
TerminalOptions {
|
|
viewport: Viewport {
|
|
area: size,
|
|
resize_behavior: ResizeBehavior::Auto,
|
|
},
|
|
},
|
|
)
|
|
}
|
|
|
|
/// UNSTABLE
|
|
pub fn with_options(backend: B, options: TerminalOptions) -> io::Result<Terminal<B>> {
|
|
Ok(Terminal {
|
|
backend,
|
|
buffers: [
|
|
Buffer::empty(options.viewport.area),
|
|
Buffer::empty(options.viewport.area),
|
|
],
|
|
current: 0,
|
|
hidden_cursor: false,
|
|
viewport: options.viewport,
|
|
})
|
|
}
|
|
|
|
/// Get a Frame object which provides a consistent view into the terminal state for rendering.
|
|
pub fn get_frame(&mut self) -> Frame<B> {
|
|
Frame {
|
|
terminal: self,
|
|
cursor_position: None,
|
|
}
|
|
}
|
|
|
|
pub fn current_buffer_mut(&mut self) -> &mut Buffer {
|
|
&mut self.buffers[self.current]
|
|
}
|
|
|
|
pub fn backend(&self) -> &B {
|
|
&self.backend
|
|
}
|
|
|
|
pub fn backend_mut(&mut self) -> &mut B {
|
|
&mut self.backend
|
|
}
|
|
|
|
/// Obtains a difference between the previous and the current buffer and passes it to the
|
|
/// current backend for drawing.
|
|
pub fn flush(&mut self) -> io::Result<()> {
|
|
let previous_buffer = &self.buffers[1 - self.current];
|
|
let current_buffer = &self.buffers[self.current];
|
|
let updates = previous_buffer.diff(current_buffer);
|
|
self.backend.draw(updates.into_iter())
|
|
}
|
|
|
|
/// Updates the Terminal so that internal buffers match the requested size. Requested size will
|
|
/// be saved so the size can remain consistent when rendering.
|
|
/// This leads to a full clear of the screen.
|
|
pub fn resize(&mut self, area: Rect) -> io::Result<()> {
|
|
self.buffers[self.current].resize(area);
|
|
self.buffers[1 - self.current].resize(area);
|
|
self.viewport.area = area;
|
|
self.clear()
|
|
}
|
|
|
|
/// Queries the backend for size and resizes if it doesn't match the previous size.
|
|
pub fn autoresize(&mut self) -> io::Result<()> {
|
|
if self.viewport.resize_behavior == ResizeBehavior::Auto {
|
|
let size = self.size()?;
|
|
if size != self.viewport.area {
|
|
self.resize(size)?;
|
|
}
|
|
};
|
|
Ok(())
|
|
}
|
|
|
|
/// Synchronizes terminal size, calls the rendering closure, flushes the current internal state
|
|
/// and prepares for the next draw call.
|
|
pub fn draw<F>(&mut self, f: F) -> io::Result<CompletedFrame>
|
|
where
|
|
F: FnOnce(&mut Frame<B>),
|
|
{
|
|
// Autoresize - otherwise we get glitches if shrinking or potential desync between widgets
|
|
// and the terminal (if growing), which may OOB.
|
|
self.autoresize()?;
|
|
|
|
let mut frame = self.get_frame();
|
|
f(&mut frame);
|
|
// We can't change the cursor position right away because we have to flush the frame to
|
|
// stdout first. But we also can't keep the frame around, since it holds a &mut to
|
|
// Terminal. Thus, we're taking the important data out of the Frame and dropping it.
|
|
let cursor_position = frame.cursor_position;
|
|
|
|
// Draw to stdout
|
|
self.flush()?;
|
|
|
|
match cursor_position {
|
|
None => self.hide_cursor()?,
|
|
Some((x, y)) => {
|
|
self.show_cursor()?;
|
|
self.set_cursor(x, y)?;
|
|
}
|
|
}
|
|
|
|
// Swap buffers
|
|
self.buffers[1 - self.current].reset();
|
|
self.current = 1 - self.current;
|
|
|
|
// Flush
|
|
self.backend.flush()?;
|
|
Ok(CompletedFrame {
|
|
buffer: &self.buffers[1 - self.current],
|
|
area: self.viewport.area,
|
|
})
|
|
}
|
|
|
|
pub fn hide_cursor(&mut self) -> io::Result<()> {
|
|
self.backend.hide_cursor()?;
|
|
self.hidden_cursor = true;
|
|
Ok(())
|
|
}
|
|
|
|
pub fn show_cursor(&mut self) -> io::Result<()> {
|
|
self.backend.show_cursor()?;
|
|
self.hidden_cursor = false;
|
|
Ok(())
|
|
}
|
|
|
|
pub fn get_cursor(&mut self) -> io::Result<(u16, u16)> {
|
|
self.backend.get_cursor()
|
|
}
|
|
|
|
pub fn set_cursor(&mut self, x: u16, y: u16) -> io::Result<()> {
|
|
self.backend.set_cursor(x, y)
|
|
}
|
|
|
|
/// Clear the terminal and force a full redraw on the next draw call.
|
|
pub fn clear(&mut self) -> io::Result<()> {
|
|
self.backend.clear()?;
|
|
// Reset the back buffer to make sure the next update will redraw everything.
|
|
self.buffers[1 - self.current].reset();
|
|
Ok(())
|
|
}
|
|
|
|
/// Queries the real size of the backend.
|
|
pub fn size(&self) -> io::Result<Rect> {
|
|
self.backend.size()
|
|
}
|
|
}
|