tek/src/core/render.rs

use crate::core::*;
use ratatui::widgets::WidgetRef;

/// Trait for things that render to the display.
pub trait Render {
    // Render something to an area of the buffer.
    // Returns area used by component.
    // This is insufficient but for the most basic dynamic layout algorithms.
    fn render (&self, _b: &mut Buffer, _a: Rect) -> Usually<Rect> {
        Ok(Rect { x: 0, y: 0, width: 0, height: 0 })
    }
    fn min_width (&self) -> u16 {
        0
    }
    fn max_width (&self) -> u16 {
        u16::MAX
    }
    fn min_height (&self) -> u16 {
        0
    }
    fn max_height (&self) -> u16 {
        u16::MAX
    }
}

impl Render for Box<dyn Device> {
    fn render (&self, b: &mut Buffer, a: Rect) -> Usually<Rect> {
        (**self).render(b, a)
    }
}

impl WidgetRef for &dyn Render {
    fn render_ref (&self, area: Rect, buf: &mut Buffer) {
        Render::render(*self, buf, area).expect("Failed to render device.");
    }
}

impl WidgetRef for dyn Render {
    fn render_ref (&self, area: Rect, buf: &mut Buffer) {
        Render::render(self, buf, area).expect("Failed to render device.");
    }
}

pub trait Blit {
    // Render something to X, Y coordinates in a buffer, ignoring width/height.
    fn blit (&self, buf: &mut Buffer, x: u16, y: u16, style: Option<Style>);
}

impl<T: AsRef<str>> Blit for T {
    fn blit (&self, buf: &mut Buffer, x: u16, y: u16, style: Option<Style>) {
        if x < buf.area.width && y < buf.area.height {
            buf.set_string(x, y, self.as_ref(), style.unwrap_or(Style::default()))
        }
    }
}