Modifier and Blink Support

BREAKING-CHANGES.md

@@ -46,6 +46,32 @@ If you use per-cell underline colors, enable the feature explicitly:
 
 If you don't use underline colors, no changes are needed.
 
+### New fields on `EmbeddedBackendConfig` ([#172])
+
+[#172]: https://github.com/ratatui/mousefood/pull/172
+
+`EmbeddedBackendConfig` has two new fields: `cursor` (`CursorConfig`) and `blink` (`BlinkConfig`,
+behind the `blink` feature flag). Since the struct is exhaustive, this is a breaking change for
+anyone constructing it directly. The `blink` feature is disabled by default due to performance overhead.
+
+#### Migration guide
+
+```diff
+let config = EmbeddedBackendConfig {
+    flush_callback: Box::new(|_| {}),
+    font_regular: default_font,
+    font_bold: None,
+    font_italic: None,
+    vertical_alignment: TerminalAlignment::Start,
+    horizontal_alignment: TerminalAlignment::Start,
+    color_theme: ColorTheme::default(),
++   cursor: CursorConfig::default(),
++   blink: BlinkConfig::default(),
+};
+```
+
+If you use `..Default::default()`, no changes are needed.
+
 ## [v0.4.0](https://github.com/ratatui/mousefood/releases/tag/0.4.0)
 
 ### `framebuffer` module is no longer part of the public API ([#149])

README.md

@@ -135,12 +135,57 @@ Mousefood includes popular color themes that can be used directly:
 - `ColorTheme::ansi()` - Standard ANSI colors (default)
 - `ColorTheme::tokyo_night()` - Tokyo Night dark theme with blue/purple tones
 
+### Cursor and blink
+
+Mousefood supports configurable cursor styles and text blinking.
+
+The cursor style can be set to `Inverse` (default), `Underline`, `Outline`, or `Japanese`.
+Inverse mode requires the `framebuffer` feature and falls back to underline without it.
+
+```rust,ignore
+let config = EmbeddedBackendConfig {
+    cursor: CursorConfig {
+        style: CursorStyle::Japanese,
+        blink: true,
+        color: Rgb888::WHITE, 
+
+    },
+    ..Default::default()
+};
+```
+
+Text blink modifiers (`SLOW_BLINK`, `RAPID_BLINK`) and cursor blinking are
+behind the `blink` feature flag to avoid unnecessary computation and memory
+usage when not needed:
+
+```toml
+[dependencies]
+mousefood = { version = "*", features = ["blink"] }
+```
+
+Blink timing is configurable:
+
+```rust,ignore
+let config = EmbeddedBackendConfig {
+    #[cfg(feature = "blink")]
+    blink: BlinkConfig {
+        fps: 30,
+        slow: BlinkTiming { blinks_per_sec: 1, duty_percent: 15 },
+        fast: BlinkTiming { blinks_per_sec: 3, duty_percent: 50 },
+    },
+    ..Default::default()
+};
+```
+
+Without the `blink` feature, blink modifiers are silently ignored and the
+cursor is always visible.
+
 ### Simulator
 
 Mousefood can be run in a simulator using
 [embedded-graphics-simulator](https://crates.io/crates/embedded-graphics-simulator) crate.
 
-![Screenshot of a window running the simulator with a mousefood application](https://github.com/ratatui/mousefood/blob/66d4010deed18f755cc3148a7f682f4119b7f664/assets/simulator.png?raw=true)
+![GIF of a window running the simulator with a mousefood application](assets/blink.gif)
 
 Run simulator example:
 

examples/simulator/Cargo.toml

@@ -3,8 +3,17 @@ name = "simulator"
 edition.workspace = true
 license.workspace = true
 publish = false
+default-run = "minimal"
 
 [dependencies]
-mousefood = { path = "../../mousefood/" }
+mousefood = { path = "../../mousefood/" , features = ["blink"]}
 embedded-graphics-simulator.workspace = true
 ratatui.workspace = true
+
+[[bin]]
+name = "minimal"
+path = "src/minimal.rs"
+
+[[bin]]
+name = "modifiers"
+path = "src/modifiers.rs"

examples/simulator/README.md

@@ -13,12 +13,18 @@ before running the application.
 
 ## Run
 
-To start this demo, simply run:
+To start the minimal demo, simply run:
 
 ```shell
 cargo run -p simulator
 ```
 
+For the modifiers demo, run:
+
+```shell
+cargo run -p simulator --bin modifiers
+```
+
 A window will open with the simulator running.
 
 <!-- cargo-rdme end -->

examples/simulator/src/modifiers.rs

@@ -0,0 +1,166 @@
+//! # Simulator
+//!
+//! Run mousefood apps on your computer inside a simulator! Uses [embedded-graphics-simulator](https://crates.io/crates/embedded-graphics-simulator).
+//!
+//! ## Requirements
+//!
+//! This app requires [SDL2](https://wiki.libsdl.org/SDL2/Installation) to be installed.
+//!
+//! If you use [nix](https://nixos.org) you can run `nix-shell -p SDL2`
+//! before running the application.
+//!
+//! ## Run
+//!
+//! To start this demo, simply run:
+//!
+//! ```shell
+//! cargo run -p simulator --bin modifiers
+//! ```
+//!
+//! A window will open with the simulator running.
+//! Use arrow keys or WASD to move the cursor.
+
+use embedded_graphics_simulator::{
+    OutputSettings, SimulatorDisplay, SimulatorEvent, Window, sdl2::Keycode,
+};
+use mousefood::embedded_graphics::geometry;
+use mousefood::error::Error;
+use mousefood::prelude::*;
+use ratatui::backend::Backend;
+use ratatui::widgets::{Block, Paragraph, Wrap};
+use ratatui::{Frame, Terminal, style::*};
+use std::cell::RefCell;
+use std::rc::Rc;
+
+fn main() -> Result<(), Error> {
+    let mut simulator_window = Window::new(
+        "mousefood simulator",
+        &OutputSettings {
+            scale: 4,
+            ..Default::default()
+        },
+    );
+    simulator_window.set_max_fps(30);
+
+    let mut display = SimulatorDisplay::<Bgr565>::new(geometry::Size::new(128, 64));
+
+    let events: Rc<RefCell<Vec<SimulatorEvent>>> = Rc::new(RefCell::new(Vec::new()));
+    let events_cb = events.clone();
+
+    let backend_config = EmbeddedBackendConfig {
+        flush_callback: Box::new(move |display| {
+            simulator_window.update(display);
+            let mut ev = events_cb.borrow_mut();
+            ev.clear();
+            ev.extend(simulator_window.events());
+        }),
+        color_theme: ColorTheme::tokyo_night(),
+        ..Default::default()
+    };
+    let backend: EmbeddedBackend<SimulatorDisplay<_>, _> =
+        EmbeddedBackend::new(&mut display, backend_config);
+
+    let mut terminal = Terminal::new(backend)?;
+    let mut cursor_x: u16 = 1;
+    let mut cursor_y: u16 = 1;
+
+    loop {
+        terminal.draw(|frame| draw(frame, cursor_x, cursor_y))?;
+
+        for event in events.borrow().iter() {
+            match event {
+                SimulatorEvent::KeyDown { keycode, .. } => match *keycode {
+                    Keycode::Up | Keycode::W => {
+                        cursor_y = cursor_y.saturating_sub(1);
+                    }
+                    Keycode::Down | Keycode::S => {
+                        cursor_y = cursor_y.saturating_add(1);
+                    }
+                    Keycode::Left | Keycode::A => {
+                        cursor_x = cursor_x.saturating_sub(1);
+                    }
+                    Keycode::Right | Keycode::D => {
+                        cursor_x = cursor_x.saturating_add(1);
+                    }
+                    _ => {}
+                },
+                SimulatorEvent::Quit => return Ok(()),
+                _ => {}
+            }
+        }
+
+        if let Ok(size) = terminal.backend_mut().size() {
+            cursor_x = cursor_x.min(size.width.saturating_sub(1));
+            cursor_y = cursor_y.min(size.height.saturating_sub(1));
+        }
+    }
+}
+
+fn draw(frame: &mut Frame, cursor_x: u16, cursor_y: u16) {
+    use ratatui::style::Modifier;
+    use ratatui::text::{Line, Span};
+
+    let line = Line::from(vec![
+        Span::styled(format!("F:{} ", frame.count()), Style::new().yellow()),
+        Span::styled("RED ", Style::new().fg(Color::Red)),
+        Span::styled(
+            "DIM ",
+            Style::new().fg(Color::Red).add_modifier(Modifier::DIM),
+        ),
+        Span::styled("UNDR ", Style::new().add_modifier(Modifier::UNDERLINED)),
+        Span::styled("SLOW ", Style::new().add_modifier(Modifier::SLOW_BLINK)),
+        Span::styled("FAST ", Style::new().add_modifier(Modifier::RAPID_BLINK)),
+        Span::styled("REV ", Style::new().add_modifier(Modifier::REVERSED)),
+        Span::styled("HIDE ", Style::new().add_modifier(Modifier::HIDDEN)),
+        Span::styled("XOUT ", Style::new().add_modifier(Modifier::CROSSED_OUT)),
+        Span::styled(
+            "D+U ",
+            Style::new().add_modifier(Modifier::DIM | Modifier::UNDERLINED),
+        ),
+        // combos
+        Span::styled(
+            "GHOST ",
+            Style::new()
+                .fg(Color::DarkGray)
+                .add_modifier(Modifier::DIM | Modifier::ITALIC),
+        ),
+        Span::styled(
+            "ALARM ",
+            Style::new()
+                .fg(Color::Red)
+                .add_modifier(Modifier::RAPID_BLINK | Modifier::REVERSED),
+        ),
+        Span::styled(
+            "DEAD ",
+            Style::new()
+                .fg(Color::Gray)
+                .add_modifier(Modifier::CROSSED_OUT | Modifier::DIM),
+        ),
+        Span::styled(
+            "SHOUT ",
+            Style::new()
+                .fg(Color::Yellow)
+                .add_modifier(Modifier::BOLD | Modifier::UNDERLINED),
+        ),
+        Span::styled(
+            "HAUNT ",
+            Style::new()
+                .fg(Color::Magenta)
+                .add_modifier(Modifier::SLOW_BLINK | Modifier::DIM),
+        ),
+        Span::styled(
+            "CRIT",
+            Style::new()
+                .fg(Color::White)
+                .bg(Color::Red)
+                .add_modifier(Modifier::BOLD | Modifier::RAPID_BLINK),
+        ),
+    ]);
+
+    let paragraph = Paragraph::new(vec![line]).wrap(Wrap { trim: true });
+    let bordered_block = Block::bordered()
+        .border_style(Style::new().yellow())
+        .title("Mods");
+    frame.render_widget(paragraph.block(bordered_block), frame.area());
+    frame.set_cursor_position((cursor_x, cursor_y));
+}

mousefood/Cargo.toml

@@ -32,7 +32,12 @@ fonts = ["dep:embedded-graphics-unicodefonts"]
 epd-weact = ["dep:weact-studio-epd"]
 epd-waveshare = ["dep:epd-waveshare"]
 framebuffer = []
+blink = []
 underline-color = ["ratatui-core/underline-color"]
 
 [lints]
 workspace = true
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]