Update readme

README.md

@@ -62,6 +62,14 @@ $ git submodule init
 $ git submodule update 
 ```
 
+Some parts of `lvgl-rs` are auto-generated. The package `lvgl-codegen` is responsible for the generated code.
+When building from source, we need to first compile the `lvgl-codegen` tool. The `lvgl-codegen` tool is used
+automatically in the [`lvgl` package build](./lvgl/build.rs).
+
+```bash
+$ DEP_LV_CONFIG_PATH=`pwd`/examples/include cargo build --package lvgl-codegen
+```
+
 Then run the `demo` example:
 
 ```shell
@@ -80,7 +88,7 @@ List of LVGL features that impacts the library usage in general.
       draw to the display. You can use `lvgl-rs` with any of the
       [`embedded_graphics` supported displays](https://docs.rs/embedded-graphics/0.6.2/embedded_graphics/#supported-displays).
 - [x] Events: You can listen and trigger events in widget objects.
-- [x] Styles: You can set styles in any exposed object. We are still missing the possibility of defining base styles.
+- [x] Styles: You can set styles in any exposed object. We are still missing the possibility of defining global base styles.
 - [ ] Input Devices
 - [ ] Fonts
 - [ ] Images
@@ -90,40 +98,5 @@ List of LVGL features that impacts the library usage in general.
 
 ### Widgets
 
-- [x] Base object (lv_obj)
-- [ ] Arc (lv_arc)
-- [x] Bar (lv_bar)
-- [x] Button (lv_btn)
-- [ ] Button matrix (lv_btnmatrix)
-- [ ] Calendar (lv_calendar)
-- [ ] Canvas (lv_canvas)
-- [ ] Checkbox (lv_cb)
-- [ ] Chart (lv_chart)
-- [ ] Container (lv_cont)
-- [ ] Color picker (lv_cpicker)
-- [ ] Drop-down list (lv_dropdown)
-- [x] Gauge (lv_gauge)
-- [ ] Image (lv_img)
-- [ ] Image button (lv_imgbtn)
-- [ ] Keyboard (lv_keyboard)
-- [x] Label (lv_label)
-- [ ] LED (lv_led)
-- [ ] Line (lv_line)
-- [ ] List (lv_list)
-- [ ] Line meter (lv_lmeter)
-- [ ] Message box (lv_msdbox)
-- [ ] Object mask (lv_objmask)
-- [ ] Page (lv_page)
-- [ ] Roller (lv_roller)
-- [ ] Slider (lv_slider)
-- [ ] Spinbox (lv_spinbox)
-- [ ] Spinner (lv_spinner)
-- [ ] Switch (lv_switch)
-- [ ] Table (lv_table)
-- [ ] Tabview (lv_tabview)
-- [ ] Text area (lv_textarea)
-- [ ] Tile view (lv_tileview)
-- [ ] Window (lv_win)
-
 Widgets currently implemented might have some missing features. If the widget you want to use is not exposed or
 is missing a feature you want to make use, please send a Pull Request or open an issue.

examples/button_click.rs

@@ -4,7 +4,7 @@ use embedded_graphics_simulator::{
     OutputSettingsBuilder, SimulatorDisplay, SimulatorEvent, Window,
 };
 use lvgl::style::Style;
-use lvgl::widgets::{Btn, Label, Msgbox, Spinbox};
+use lvgl::widgets::{Btn, Label};
 use lvgl::{self, Align, Color, DisplayDriver, Event, LvError, Part, State, Widget, UI};
 use lvgl_sys;
 use std::sync::{mpsc, Arc, Mutex};
@@ -39,9 +39,18 @@ fn main() -> Result<(), LvError> {
     button.set_size(180, 80)?;
     let mut btn_lbl = Label::new(&mut button)?;
     btn_lbl.set_text("Click me!")?;
-    button.on_event(|_, event| {
+
+    let mut btn_state = false;
+    button.on_event(|mut btn, event| {
         if let lvgl::Event::Clicked = event {
+            if btn_state {
+                btn_lbl.set_text("Click me!").unwrap();
+            } else {
+                btn_lbl.set_text("Clicked!").unwrap();
+            }
+            btn_state = !btn_state;
             println!("Clicked!");
+            btn.toggle().unwrap();
         }
     })?;
 

lvgl/build.rs

@@ -5,9 +5,14 @@ use std::process::Command;
 fn main() {
     let manifest_dir = Path::new(env!("CARGO_MANIFEST_DIR"));
     let widgets_rs_path = manifest_dir.join("src/widgets/generated.rs");
-    let codegen_bin = manifest_dir.join("../target/debug/lvgl-codegen");
-
-    println!("rerun-if-changed={}", codegen_bin.to_string_lossy());
+    let codegen_bin = manifest_dir
+        .join("..")
+        .join("target")
+        .join("debug")
+        .join("lvgl-codegen")
+        .canonicalize()
+        .unwrap();
+    println!("cargo:rerun-if-changed={}", codegen_bin.to_string_lossy());
 
     if env::var("LVGL_FORCE_CODEGEN").is_ok() || !widgets_rs_path.exists() {
         println!("Generating `src/widgets/generated.rs`");