Add info about what is implemented to the README

README.md

@@ -67,3 +67,63 @@ Then run the `demo` example:
 ```shell
 $ DEP_LV_CONFIG_PATH=`pwd`/examples/include cargo run --example demo
 ```
+
+## Feature Support
+
+The bindings are still in development. There are many features of LVGL that needs to be exposed by `lvgl-rs`. In
+this section you can check what is implemented at the moment.
+
+### Features
+
+List of LVGL features that impacts the library usage in general.
+- [x] Displays: We use [`embedded_graphics`](https://docs.rs/embedded-graphics/0.6.2/embedded_graphics/) library to
+      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: Partially supported. You can set styles in any exposed object. We are still missing the
+      possibility of defining base styles.
+- [ ] Input Devices
+- [ ] Fonts
+- [ ] Images
+- [ ] File system
+- [ ] Animations
+- [ ] Tasks
+
+### Widgets
+
+- [x] Base object (lv_obj)
+- [ ] Arc (lv_arc)
+- [x] Bar (lv_bar)
+- [x] Button (lv_btn)
+- [ ] Button matrix (lv_btnm)
+- [ ] Calendar (lv_calendar)
+- [ ] Canvas (lv_canvas)
+- [ ] Checkbox (lv_cb)
+- [ ] Chart (lv_chart)
+- [ ] Container (lv_cont)
+- [ ] Color picker (lv_cpicker)
+- [ ] Drop-down list (lv_ddlist)
+- [ ] Gauge (lv_gauge)
+- [ ] Image (lv_img)
+- [ ] Image button (lv_imgbtn)
+- [ ] Keyboard (lv_kb)
+- [x] Label (lv_label)
+- [ ] LED (lv_led)
+- [ ] Line (lv_line)
+- [ ] List (lv_list)
+- [ ] Line meter (lv_lmeter)
+- [ ] Message box (lv_mbox)
+- [ ] Page (lv_page)
+- [ ] Preloader (lv_preload)
+- [ ] Roller (lv_roller)
+- [ ] Slider (lv_slider)
+- [ ] Spinbox (lv_spinbox)
+- [ ] Switch (lv_sw)
+- [ ] Table (lv_table)
+- [ ] Tabview (lv_tabview)
+- [ ] Text area (lv_ta)
+- [ ] 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.

lvgl/src/support.rs

@@ -14,16 +14,16 @@ pub trait NativeObject {
     fn raw(&self) -> ptr::NonNull<lvgl_sys::lv_obj_t>;
 }
 
-/// Stores the native LittlevGL raw pointer.
+/// Generic LVGL object.
 ///
-/// This is the parent object of all widget objects in `lvgl-rs`.
+/// This is the parent object of all widget types. It stores the native LVGL raw pointer.
 ///
 /// # Panics
 ///
-/// Panics if LittlevGL internally deallocated the original object.
+/// Panics if LVGL internally freed the original object.
 pub struct ObjectX {
     // We use a raw pointer here because we do not control this memory address, it is controlled
-    // by LittlevGL's C code.
+    // by LVGL's global state.
     raw: *mut lvgl_sys::lv_obj_t,
 }
 
@@ -125,6 +125,14 @@ impl Object for ObjectX {
     }
 }
 
+impl Default for ObjectX {
+    fn default() -> Self {
+        Self {
+            raw: unsafe { lvgl_sys::lv_obj_create(ptr::null_mut(), ptr::null_mut()) },
+        }
+    }
+}
+
 macro_rules! define_object {
     ($item:ident) => {
         pub struct $item {