Add Gauge widget

examples/Cargo.toml

@@ -22,3 +22,7 @@ path = "bar.rs"
 [[example]]
 name = "button_click"
 path = "button_click.rs"
+
+[[example]]
+name = "gauge"
+path = "gauge.rs"

examples/bar.rs

@@ -5,7 +5,7 @@ use embedded_graphics_simulator::{
 };
 use lvgl::style::Style;
 use lvgl::widgets::{Bar, BarPart, Label, LabelAlign};
-use lvgl::{self, Align, Animation, Color, DisplayDriver, Event, ObjPart, Object, State, UI};
+use lvgl::{self, Align, Animation, Color, DisplayDriver, Event, Object, Part, State, UI};
 use lvgl_sys;
 use std::sync::{mpsc, Arc, Mutex};
 use std::thread::sleep;
@@ -32,7 +32,7 @@ fn main() -> Result<(), String> {
     let mut screen_style = Style::default();
     screen_style.set_bg_color(State::DEFAULT, Color::from_rgb((255, 255, 255)));
     screen_style.set_radius(State::DEFAULT, 0);
-    screen.add_style(ObjPart::Main, screen_style);
+    screen.add_style(Part::Main, screen_style);
 
     // Create the bar object
     let mut bar = Bar::new(&mut screen);
@@ -52,7 +52,7 @@ fn main() -> Result<(), String> {
 
     let mut loading_style = Style::default();
     loading_style.set_text_color(State::DEFAULT, Color::from_rgb((0, 0, 0)));
-    loading_lbl.add_style(ObjPart::Main, loading_style);
+    loading_lbl.add_style(Part::Main, loading_style);
 
     let threaded_ui = Arc::new(Mutex::new(ui));
 

examples/button_click.rs

@@ -5,7 +5,7 @@ use embedded_graphics_simulator::{
 };
 use lvgl::style::Style;
 use lvgl::widgets::{Button, Label};
-use lvgl::{self, Align, Color, DisplayDriver, Event, ObjPart, Object, State, UI};
+use lvgl::{self, Align, Color, DisplayDriver, Event, Object, Part, State, UI};
 use lvgl_sys;
 use std::sync::{mpsc, Arc, Mutex};
 use std::thread::sleep;
@@ -31,7 +31,7 @@ fn main() -> Result<(), String> {
 
     let mut screen_style = Style::default();
     screen_style.set_bg_color(State::DEFAULT, Color::from_rgb((0, 0, 0)));
-    screen.add_style(ObjPart::Main, screen_style);
+    screen.add_style(Part::Main, screen_style);
 
     // Create the button
     let mut button = Button::new(&mut screen);

examples/demo.rs

@@ -6,7 +6,7 @@ use embedded_graphics_simulator::{
 use lvgl;
 use lvgl::style::Style;
 use lvgl::widgets::{Label, LabelAlign};
-use lvgl::{Align, Color, ObjPart, Object, State, UI};
+use lvgl::{Align, Color, Object, Part, State, UI};
 use lvgl_sys;
 use std::sync::{mpsc, Arc, Mutex};
 use std::thread::sleep;
@@ -36,13 +36,13 @@ fn main() -> Result<(), String> {
     let mut screen_style = Style::default();
     screen_style.set_bg_color(State::DEFAULT, Color::from_rgb((0, 0, 0)));
     screen_style.set_radius(State::DEFAULT, 0);
-    screen.add_style(ObjPart::Main, screen_style);
+    screen.add_style(Part::Main, screen_style);
 
     let mut time = Label::new(&mut screen);
     let mut style_time = Style::default();
     //style_time.set_text_font(font_noto_sans_numeric_28);
     style_time.set_text_color(State::DEFAULT, Color::from_rgb((255, 255, 255)));
-    time.add_style(ObjPart::Main, style_time);
+    time.add_style(Part::Main, style_time);
     time.set_align(&mut screen, Align::Center, 0, 0);
     time.set_text("20:46");
     time.set_width(240);

examples/gauge.rs

@@ -0,0 +1,108 @@
+use embedded_graphics::pixelcolor::Rgb565;
+use embedded_graphics::prelude::*;
+use embedded_graphics_simulator::{
+    OutputSettingsBuilder, SimulatorDisplay, SimulatorEvent, Window,
+};
+use lvgl::style::{Opacity, Style};
+use lvgl::widgets::{Gauge, GaugePart};
+use lvgl::{self, Align, Color, DisplayDriver, Object, Part, State, UI};
+use lvgl_sys;
+use std::sync::{mpsc, Arc, Mutex};
+use std::thread::sleep;
+use std::time::Duration;
+
+fn main() -> Result<(), String> {
+    let mut display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
+        lvgl_sys::LV_HOR_RES_MAX,
+        lvgl_sys::LV_VER_RES_MAX,
+    ));
+
+    let output_settings = OutputSettingsBuilder::new().scale(2).build();
+    let mut window = Window::new("Gauge Example", &output_settings);
+
+    let mut ui = UI::init().unwrap();
+
+    // Implement and register your display:
+    let display_driver = DisplayDriver::new(&mut display);
+    ui.disp_drv_register(display_driver);
+
+    // Create screen and widgets
+    let mut screen = ui.scr_act();
+
+    let mut screen_style = Style::default();
+    screen_style.set_bg_color(State::DEFAULT, Color::from_rgb((0, 0, 0)));
+    screen.add_style(Part::Main, screen_style);
+
+    // Create the gauge
+    let mut gauge_style = Style::default();
+    // Set a background color and a radius
+    gauge_style.set_radius(State::DEFAULT, 5);
+    gauge_style.set_bg_opa(State::DEFAULT, Opacity::OPA_COVER);
+    gauge_style.set_bg_color(State::DEFAULT, Color::from_rgb((192, 192, 192)));
+    // Set some paddings
+    gauge_style.set_pad_inner(State::DEFAULT, 20);
+    gauge_style.set_pad_top(State::DEFAULT, 20);
+    gauge_style.set_pad_left(State::DEFAULT, 5);
+    gauge_style.set_pad_right(State::DEFAULT, 5);
+
+    gauge_style.set_scale_end_color(State::DEFAULT, Color::from_rgb((255, 0, 0)));
+    gauge_style.set_line_color(State::DEFAULT, Color::from_rgb((255, 255, 255)));
+    gauge_style.set_scale_grad_color(State::DEFAULT, Color::from_rgb((0, 0, 255)));
+    gauge_style.set_line_width(State::DEFAULT, 2);
+    gauge_style.set_scale_end_line_width(State::DEFAULT, 4);
+    gauge_style.set_scale_end_border_width(State::DEFAULT, 4);
+
+    let mut gauge = Gauge::new(&mut screen);
+    gauge.add_style(GaugePart::Main, gauge_style);
+    gauge.set_align(&mut screen, Align::Center, 0, 0);
+    gauge.set_value(0, 50);
+
+    let threaded_ui = Arc::new(Mutex::new(ui));
+
+    let (stop_ch, read_ch) = mpsc::channel();
+    let closure_ui = threaded_ui.clone();
+    let tick_thr = std::thread::spawn(move || loop {
+        let period = Duration::from_millis(5);
+
+        // Needs to be called periodically for LittlevGL internal timing calculations.
+        closure_ui.lock().unwrap().tick_inc(period);
+
+        sleep(period);
+        if read_ch.try_recv().is_ok() {
+            break;
+        }
+    });
+
+    let mut i = 0;
+    'running: loop {
+        threaded_ui.lock().unwrap().task_handler();
+
+        window.update(&display);
+        for event in window.events() {
+            match event {
+                SimulatorEvent::MouseButtonUp {
+                    mouse_btn: _,
+                    point,
+                } => {
+                    println!("Clicked on: {:?}", point);
+                }
+                SimulatorEvent::Quit => break 'running,
+                _ => {}
+            }
+        }
+
+        sleep(Duration::from_millis(25));
+        gauge.set_value(0, i);
+
+        if i > 99 {
+            i = 0;
+        } else {
+            i = i + 1;
+        }
+    }
+
+    stop_ch.send(true).unwrap();
+    tick_thr.join().unwrap();
+
+    Ok(())
+}

lvgl-codegen/Cargo.toml

@@ -3,6 +3,7 @@ name = "lvgl-codegen"
 version = "0.1.0"
 authors = ["Rafael Caricio <rafael@caricio.com>"]
 edition = "2018"
+publish = false
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

lvgl/src/lv_core/object.rs

@@ -94,7 +94,7 @@ pub trait Object: NativeObject {
 
 impl Object for GenericObject {
     type SpecialEvent = ();
-    type Part = ObjPart;
+    type Part = Part;
 
     unsafe fn from_raw(raw: ptr::NonNull<lvgl_sys::lv_obj_t>) -> Self {
         Self { raw: raw.as_ptr() }
@@ -111,10 +111,10 @@ impl Default for GenericObject {
 
 macro_rules! define_object {
     ($item:ident) => {
-        define_object!($item, event = (), part = $crate::ObjPart);
+        define_object!($item, event = (), part = $crate::Part);
     };
     ($item:ident, event = $event_type:ty) => {
-        define_object!($item, event = $event_type, part = $crate::ObjPart);
+        define_object!($item, event = $event_type, part = $crate::Part);
     };
     ($item:ident, part = $part_type:ty) => {
         define_object!($item, event = (), part = $part_type);
@@ -189,16 +189,16 @@ impl State {
     }
 }
 
-pub enum ObjPart {
+pub enum Part {
     Main,
     All,
 }
 
-impl Into<u8> for ObjPart {
+impl Into<u8> for Part {
     fn into(self) -> u8 {
         match self {
-            ObjPart::Main => lvgl_sys::LV_OBJ_PART_MAIN as u8,
-            ObjPart::All => lvgl_sys::LV_OBJ_PART_ALL as u8,
+            Part::Main => lvgl_sys::LV_OBJ_PART_MAIN as u8,
+            Part::All => lvgl_sys::LV_OBJ_PART_ALL as u8,
         }
     }
 }

lvgl/src/lv_core/style.rs

@@ -29,7 +29,6 @@ impl Style {
         let native_state: u32 = state.get_bits();
         let string = CString::new(value).unwrap();
         unsafe {
-            lvgl_sys::LV_OPA_COVER;
             lvgl_sys::_lv_style_set_ptr(
                 self.raw.as_mut(),
                 (lvgl_sys::LV_STYLE_VALUE_STR

lvgl/src/widgets/gauge.rs

@@ -0,0 +1,41 @@
+use crate::{GenericObject, NativeObject, Object};
+use core::ptr;
+
+define_object!(Gauge, part = GaugePart);
+
+impl Gauge {
+    pub fn new<C>(parent: &mut C) -> Self
+    where
+        C: NativeObject,
+    {
+        unsafe {
+            let ptr = lvgl_sys::lv_gauge_create(parent.raw().as_mut(), ptr::null_mut());
+            let raw = ptr::NonNull::new_unchecked(ptr);
+            let core = GenericObject::from_raw(raw);
+            Self { core }
+        }
+    }
+
+    /// Set a new value on the gauge
+    pub fn set_value(&mut self, needle_id: u8, value: i32) {
+        unsafe {
+            lvgl_sys::lv_gauge_set_value(self.core.raw().as_mut(), needle_id, value);
+        }
+    }
+}
+
+pub enum GaugePart {
+    Main,
+    Major,
+    Needle,
+}
+
+impl From<GaugePart> for u8 {
+    fn from(part: GaugePart) -> Self {
+        match part {
+            GaugePart::Main => lvgl_sys::LV_GAUGE_PART_MAIN as u8,
+            GaugePart::Major => lvgl_sys::LV_GAUGE_PART_MAJOR as u8,
+            GaugePart::Needle => lvgl_sys::LV_GAUGE_PART_NEEDLE as u8,
+        }
+    }
+}

lvgl/src/widgets/mod.rs

@@ -1,7 +1,9 @@
 mod bar;
 mod button;
+mod gauge;
 mod label;
 
 pub use self::bar::*;
 pub use self::button::*;
+pub use self::gauge::*;
 pub use self::label::*;