working extension system

src/extensions/mod.rs

@@ -0,0 +1,10 @@
+pub mod tick;
+pub mod velocity;
+
+use std::sync::Arc;
+
+use crate::widget::Widget;
+
+pub trait Extension {
+    fn render(&self, _widget: &Arc<Widget>) {}
+}

src/extensions/tick.rs

@@ -0,0 +1,15 @@
+use std::sync::Arc;
+
+use crate::{component, extensions::Extension, widget::Widget};
+
+pub struct TickExtension;
+
+impl Extension for TickExtension {
+    fn render(&self, _widget: &Arc<Widget>) {
+        if let Some(on_tick) = _widget.get::<OnTick>() {
+            (on_tick.0)(_widget)
+        }
+    }
+}
+
+component!(OnTick(pub fn(&Arc<Widget>)));

src/extensions/velocity.rs

@@ -0,0 +1,44 @@
+use std::sync::Arc;
+
+use crate::{
+    component,
+    extensions::Extension,
+    style::{Position, Transform},
+    widget::Widget,
+};
+
+pub struct VelocityExtension;
+
+impl Extension for VelocityExtension {
+    fn render(&self, _widget: &Arc<Widget>) {
+        if let Some(velocity) = _widget.get::<Velocity>() {
+            if let Some(mut t) = _widget.get::<Transform>() {
+                match &mut t.x {
+                    Position::Const(x) => {
+                        if velocity.0 > 0 {
+                            *x += 1;
+                        } else if velocity.0 < 0 {
+                            *x -= 1;
+                        }
+                    }
+                    _ => {}
+                }
+
+                match &mut t.y {
+                    Position::Const(y) => {
+                        if velocity.1 > 0 {
+                            *y += 1;
+                        } else if velocity.1 < 0 {
+                            *y -= 1;
+                        }
+                    }
+                    _ => {}
+                }
+
+                _widget.set_component(t);
+            }
+        }
+    }
+}
+
+component!(Velocity(pub i32, pub i32));

src/lib.rs

@@ -1,12 +1,14 @@
 use std::sync::Arc;
 
 use crate::{
+    extensions::Extension,
     render_scope::RenderScope,
     style::Transform,
     widget::{Element, Widget},
 };
 
 pub mod elements;
+pub mod extensions;
 pub mod macros;
 pub mod render_scope;
 pub mod style;
@@ -15,12 +17,14 @@ pub mod widget;
 
 pub struct Screen {
     pub elements: Vec<Arc<Widget>>,
+    extensions: Vec<Arc<Box<dyn Extension>>>,
 }
 
 impl Screen {
     pub fn new() -> Screen {
         Screen {
             elements: Vec::new(),
+            extensions: Vec::new(),
         }
     }
 
@@ -29,6 +33,10 @@ impl Screen {
         self.elements.last().unwrap()
     }
 
+    pub fn extension<E: Extension + 'static>(&mut self, ext: E) {
+        self.extensions.push(Arc::new(Box::new(ext)));
+    }
+
     pub fn run(&mut self) -> std::io::Result<()> {
         for elem in &mut self.elements {
             elem.component(Transform::new());
@@ -36,21 +44,23 @@ impl Screen {
 
         utils::hide_cursor()?;
 
-        self.render()?;
-
-        loop {}
+        loop {
+            self.render()?;
+            std::thread::sleep(std::time::Duration::from_millis(50));
+        }
     }
 
-    pub fn render(&mut self) -> std::io::Result<()> {
+    pub fn render(&self) -> std::io::Result<()> {
         let mut scope = RenderScope::new();
 
         utils::clear()?;
-        for elem in &mut self.elements {
+        for elem in &self.elements {
             scope.clear();
             if let Some(t) = elem.get() {
                 scope.set_transform(&t);
             }
 
+            self.render_extension(elem.clone()).unwrap();
             elem.0.lock().unwrap().render(&mut scope);
 
             if let Some(t) = elem.get() {
@@ -60,4 +70,11 @@ impl Screen {
         }
         Ok(())
     }
+
+    pub fn render_extension(&self, wi: Arc<Widget>) -> std::io::Result<()> {
+        for ext in &self.extensions {
+            ext.render(&wi);
+        }
+        Ok(())
+    }
 }

src/main.rs

@@ -1,11 +1,33 @@
-use osui::{style::Transform, Screen};
+use osui::{
+    extensions::{
+        tick::{OnTick, TickExtension},
+        velocity::{Velocity, VelocityExtension},
+    },
+    style::{Position, Transform},
+    Screen,
+};
 
 fn main() {
     let mut screen = Screen::new();
+    screen.extension(VelocityExtension);
+    screen.extension(TickExtension);
 
     screen
         .draw(format!("Hello, World!"))
-        .component(Transform::center());
+        .component(Transform::new())
+        .component(Velocity(1, 0))
+        .component(OnTick(|w| {
+            if let Some(mut v) = w.get::<Velocity>() {
+                if let Some(t) = w.get::<Transform>() {
+                    if let Position::Const(c) = t.x {
+                        if c == 30 {
+                            v.0 = 0;
+                            w.set_component(v);
+                        }
+                    }
+                }
+            }
+        }));
 
     screen.run().unwrap();
 }