add a simple counter

src/counter.rs

@@ -0,0 +1,124 @@
+use sfml::{
+    graphics::{Color, Drawable, Font, RectangleShape, Shape, Text, Transformable},
+    system::Vector2f,
+};
+
+use crate::button::Button;
+
+pub struct Counter<'a> {
+    count: u32,
+    count_str: Text<'a>,
+    background: RectangleShape<'a>,
+    dec_button: Button<'a>,
+    inc_button: Button<'a>,
+    reset_button: Button<'a>,
+}
+
+impl<'a> Counter<'a> {
+    pub fn new(count: u32, font: &'a Font) -> Self {
+        let mut background = RectangleShape::with_size(Vector2f::new(200., 70.));
+        background.set_fill_color(Color::YELLOW);
+        background.set_outline_color(Color::BLUE);
+        background.set_outline_thickness(10.);
+        background.set_position((400., 300.));
+        let bounds = background.local_bounds();
+        background.set_origin((
+            bounds.left + bounds.width / 2.,
+            bounds.top + bounds.height / 2.,
+        ));
+
+        let mut count_str = Text::new(&count.to_string(), font, 32);
+        count_str.set_fill_color(Color::BLACK);
+        count_str.set_position((400., 300.));
+        let bounds = count_str.local_bounds();
+        count_str.set_origin((
+            bounds.left + bounds.width / 2.,
+            bounds.top + bounds.height / 2.,
+        ));
+
+        let dec_button = Button::new(
+            "-".to_string(),
+            font,
+            Vector2f::new(
+                background.position().x - 70.,
+                background.position().y,
+            ),
+            Box::new(|count| if count == 0 { 0 } else { count - 1 }),
+        );
+
+        let inc_button = Button::new(
+            "+".to_string(),
+            font,
+            Vector2f::new(
+                background.position().x + 70.,
+                background.position().y,
+            ),
+            Box::new(|count| if count == u32::MAX { 0 } else { count + 1 }),
+        );
+
+        let reset_button = Button::new(
+            "R".to_string(),
+            font,
+            Vector2f::new(0., 0.),
+            Box::new(|_count| 0),
+        );
+
+        Counter {
+            count,
+            count_str,
+            background,
+            dec_button,
+            inc_button,
+            reset_button,
+        }
+    }
+
+    pub fn inc(&mut self) {
+        self.count = (self.inc_button.exec)(self.count);
+        self.update();
+    }
+
+    pub fn dec(&mut self) {
+        self.count = (self.dec_button.exec)(self.count);
+        self.update();
+    }
+
+    pub fn reset(&mut self) {
+        self.count = (self.reset_button.exec)(self.count);
+        self.update();
+    }
+
+    fn update(&mut self) {
+        self.count_str.set_string(&self.count.to_string());
+        let digits = self.count.checked_ilog10().unwrap_or(0);
+        if self.count % (10 * if digits == 0 { 1 } else { digits }) == 0 {
+            let bounds = self.count_str.local_bounds();
+            self.count_str.set_origin((
+                bounds.left + bounds.width / 2.,
+                bounds.top + bounds.height / 2.,
+            ));
+        }
+    }
+
+    pub fn handle_mouse(&mut self, x: i32, y: i32) {
+        if self.dec_button.contains(x, y) {
+            self.dec();
+        }
+        if self.inc_button.contains(x, y) {
+            self.inc();
+        }
+    }
+}
+
+impl<'d> Drawable for Counter<'d> {
+    fn draw<'a: 'shader, 'texture, 'shader, 'shader_texture>(
+        &'a self,
+        target: &mut dyn sfml::graphics::RenderTarget,
+        states: &sfml::graphics::RenderStates<'texture, 'shader, 'shader_texture>,
+    ) {
+        self.background.draw(target, states);
+        self.count_str.draw(target, states);
+        self.dec_button.draw(target, states);
+        self.inc_button.draw(target, states);
+    }
+}