Add styling support for ComboBox and Menu

style/src/menu.rs

@@ -0,0 +1,25 @@
+use iced_core::{Background, Color};
+
+/// The appearance of a menu.
+#[derive(Debug, Clone, Copy)]
+pub struct Style {
+    pub text_color: Color,
+    pub background: Background,
+    pub border_width: u16,
+    pub border_color: Color,
+    pub selected_text_color: Color,
+    pub selected_background: Background,
+}
+
+impl std::default::Default for Style {
+    fn default() -> Self {
+        Self {
+            text_color: Color::BLACK,
+            background: Background::Color([0.87, 0.87, 0.87].into()),
+            border_width: 1,
+            border_color: [0.7, 0.7, 0.7].into(),
+            selected_text_color: Color::WHITE,
+            selected_background: Background::Color([0.4, 0.4, 1.0].into()),
+        }
+    }
+}