Update Bar example

examples/bar.rs

@@ -3,8 +3,9 @@ use embedded_graphics::prelude::*;
 use embedded_graphics_simulator::{
     OutputSettingsBuilder, SimulatorDisplay, SimulatorEvent, Window,
 };
-use lvgl::widgets::{Bar, BarComponent, Label, LabelAlign};
-use lvgl::{self, Align, Animation, Border, Color, DisplayDriver, Event, Object, Style, UI};
+use lvgl::style::{State, Style};
+use lvgl::widgets::{Bar, BarPart, Label, LabelAlign};
+use lvgl::{self, Align, Animation, Color, DisplayDriver, Event, ObjPart, Object, UI};
 use lvgl_sys;
 use std::sync::{mpsc, Arc, Mutex};
 use std::thread::sleep;
@@ -29,32 +30,20 @@ fn main() -> Result<(), String> {
     let mut screen = ui.scr_act();
 
     let mut screen_style = Style::default();
-    screen_style.set_body_main_color(Color::from_rgb((255, 255, 255)));
-    screen_style.set_body_grad_color(Color::from_rgb((255, 255, 255)));
-    screen_style.set_body_radius(0);
-    screen.set_style(screen_style);
+    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);
 
     // Create the bar object
     let mut bar = Bar::new(&mut screen);
-    bar.set_size(175, 50);
-    bar.set_align(&mut screen, Align::Center, 0, 20);
+    bar.set_size(175, 20);
+    bar.set_align(&mut screen, Align::Center, 0, 10);
     bar.set_range(0, 100);
-    bar.set_value(0, Animation::OFF);
 
-    // Set the indicator style for the bar object
+    // // Set the indicator style for the bar object
     let mut ind_style = Style::default();
-    ind_style.set_body_main_color(Color::from_rgb((100, 245, 0)));
-    ind_style.set_body_grad_color(Color::from_rgb((100, 245, 0)));
-    bar.set_bar_style(BarComponent::Indicator, ind_style);
-
-    // Set the background style for the bar object
-    let mut bg_style = Style::default();
-    bg_style.set_body_grad_color(Color::from_rgb((255, 255, 255)));
-    bg_style.set_body_main_color(Color::from_rgb((255, 255, 255)));
-    bg_style.set_body_radius(0);
-    bg_style.set_body_border_part(Border::TOP);
-    bg_style.set_body_border_width(1);
-    bar.set_bar_style(BarComponent::Background, bg_style);
+    ind_style.set_bg_color(State::DEFAULT, Color::from_rgb((100, 245, 100)));
+    bar.add_style(BarPart::Indicator, ind_style);
 
     let mut loading_lbl = Label::new(&mut screen);
     loading_lbl.set_text("Loading...");
@@ -62,8 +51,8 @@ fn main() -> Result<(), String> {
     loading_lbl.set_label_align(LabelAlign::Center);
 
     let mut loading_style = Style::default();
-    loading_style.set_text_color(Color::from_rgb((0, 0, 0)));
-    loading_lbl.set_style(loading_style);
+    loading_style.set_text_color(State::DEFAULT, Color::from_rgb((0, 0, 0)));
+    loading_lbl.add_style(ObjPart::Main, loading_style);
 
     let threaded_ui = Arc::new(Mutex::new(ui));
 

lvgl/src/lv_core/mod.rs

@@ -1,3 +1 @@
 pub mod style;
-
-use style::*;

lvgl/src/lv_core/style.rs

@@ -1,6 +1,5 @@
 use crate::Color;
 use alloc::boxed::Box;
-use core::borrow::BorrowMut;
 use core::mem;
 use cstr_core::CString;
 use lvgl_sys;

lvgl/src/support.rs

@@ -1,7 +1,6 @@
 use crate::lv_core::style::Style;
 use alloc::boxed::Box;
 use core::convert::{TryFrom, TryInto};
-use core::mem;
 use core::ptr;
 use core::ptr::NonNull;
 use embedded_graphics::pixelcolor::{Rgb565, Rgb888};
@@ -32,6 +31,7 @@ impl NativeObject for GenericObject {
 /// A wrapper for all LittlevGL common operations on generic objects.
 pub trait Object: NativeObject {
     type SpecialEvent;
+    type Part: Into<u8>;
 
     /// Construct an instance of the object from a raw pointer.
     ///
@@ -40,6 +40,12 @@ pub trait Object: NativeObject {
     ///
     unsafe fn from_raw(raw_pointer: ptr::NonNull<lvgl_sys::lv_obj_t>) -> Self;
 
+    fn add_style(&mut self, part: Self::Part, style: Style) {
+        unsafe {
+            lvgl_sys::lv_obj_add_style(self.raw().as_mut(), part.into(), Box::into_raw(style.raw));
+        };
+    }
+
     fn set_pos(&mut self, x: i16, y: i16) {
         unsafe {
             lvgl_sys::lv_obj_set_pos(
@@ -109,26 +115,31 @@ pub trait Object: NativeObject {
             );
         }
     }
-
-    fn add_style(&mut self, style: Style) {
-        unsafe {
-            lvgl_sys::lv_obj_add_style(
-                self.raw().as_mut(),
-                lvgl_sys::LV_OBJ_PART_MAIN as u8,
-                Box::into_raw(style.raw),
-            );
-        };
-    }
 }
 
 impl Object for GenericObject {
     type SpecialEvent = ();
+    type Part = ObjPart;
 
     unsafe fn from_raw(raw: ptr::NonNull<lvgl_sys::lv_obj_t>) -> Self {
         Self { raw: raw.as_ptr() }
     }
 }
 
+pub enum ObjPart {
+    Main,
+    All,
+}
+
+impl Into<u8> for ObjPart {
+    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,
+        }
+    }
+}
+
 impl Default for GenericObject {
     fn default() -> Self {
         Self {
@@ -139,48 +150,18 @@ impl Default for GenericObject {
 
 macro_rules! define_object {
     ($item:ident) => {
-        pub struct $item {
-            core: $crate::support::GenericObject,
-        }
-
-        impl $item {
-            pub fn on_event<F>(&mut self, f: F)
-            where
-                F: FnMut(
-                    Self,
-                    $crate::support::Event<<Self as $crate::support::Object>::SpecialEvent>,
-                ),
-            {
-                unsafe {
-                    let mut raw = self.raw();
-                    let obj = raw.as_mut();
-                    let user_closure = alloc::boxed::Box::new(f);
-                    obj.user_data = alloc::boxed::Box::into_raw(user_closure) as *mut cty::c_void;
-                    lvgl_sys::lv_obj_set_event_cb(
-                        obj,
-                        lvgl_sys::lv_event_cb_t::Some($crate::support::event_callback::<Self, F>),
-                    );
-                }
-            }
-        }
-
-        impl $crate::support::NativeObject for $item {
-            fn raw(&self) -> core::ptr::NonNull<lvgl_sys::lv_obj_t> {
-                self.core.raw()
-            }
-        }
-
-        impl $crate::support::Object for $item {
-            type SpecialEvent = ();
-
-            unsafe fn from_raw(raw_pointer: core::ptr::NonNull<lvgl_sys::lv_obj_t>) -> Self {
-                Self {
-                    core: $crate::support::GenericObject::from_raw(raw_pointer),
-                }
-            }
-        }
+        define_object!($item, event = (), part = $crate::support::ObjPart);
     };
-    ($item:ident, $event_type:ident) => {
+    ($item:ident, event = $event_type:ty) => {
+        define_object!($item, event = $event_type, part = $crate::support::ObjPart);
+    };
+    ($item:ident, part = $part_type:ty) => {
+        define_object!($item, event = (), part = $part_type);
+    };
+    ($item:ident, part = $part_type:ty, event = $event_type:ty) => {
+        define_object!($item, event = $event_type, part = $part_type);
+    };
+    ($item:ident, event = $event_type:ty, part = $part_type:ty) => {
         pub struct $item {
             core: $crate::support::GenericObject,
         }
@@ -214,6 +195,7 @@ macro_rules! define_object {
 
         impl $crate::support::Object for $item {
             type SpecialEvent = $event_type;
+            type Part = $part_type;
 
             unsafe fn from_raw(raw_pointer: core::ptr::NonNull<lvgl_sys::lv_obj_t>) -> Self {
                 Self {

lvgl/src/widgets/bar.rs

@@ -1,10 +1,8 @@
-use crate::style::Style;
 use crate::support::{Animation, GenericObject, NativeObject};
 use crate::Object;
-use alloc::boxed::Box;
 use core::ptr;
 
-define_object!(Bar);
+define_object!(Bar, part = BarPart);
 
 impl Bar {
     pub fn new<C>(parent: &mut C) -> Self
@@ -32,22 +30,10 @@ impl Bar {
             lvgl_sys::lv_bar_set_value(self.core.raw().as_mut(), value, anim.into());
         }
     }
-
-    /// Set the style, for the given `BarComponent`
-    pub fn set_bar_style(&mut self, style: Style) {
-        let boxed = style.raw;
-        unsafe {
-            lvgl_sys::lv_obj_add_style(
-                self.core.raw().as_mut(),
-                lvgl_sys::LV_OBJ_PART_MAIN as u8,
-                Box::into_raw(boxed),
-            );
-        }
-    }
 }
 
-/// The different components, of a bar object.
-pub enum BarComponent {
+/// The different parts, of a bar object.
+pub enum BarPart {
     /// The background of the bar.
     Background,
     /// The indicator of the bar.
@@ -55,11 +41,11 @@ pub enum BarComponent {
     Indicator,
 }
 
-impl From<BarComponent> for lvgl_sys::lv_bar_style_t {
-    fn from(component: BarComponent) -> Self {
+impl From<BarPart> for u8 {
+    fn from(component: BarPart) -> Self {
         match component {
-            BarComponent::Background => lvgl_sys::LV_BAR_STYLE_BG as u8,
-            BarComponent::Indicator => lvgl_sys::LV_BAR_STYLE_INDIC as u8,
+            BarPart::Background => lvgl_sys::LV_BAR_PART_BG as u8,
+            BarPart::Indicator => lvgl_sys::LV_BAR_PART_INDIC as u8,
         }
     }
 }