Draft Style and StyleSheet for Button

wgpu/src/widget/button.rs

@@ -0,0 +1,97 @@
+//! Allow your users to perform actions by pressing a button.
+//!
+//! A [`Button`] has some local [`State`].
+//!
+//! [`Button`]: type.Button.html
+//! [`State`]: struct.State.html
+use crate::Renderer;
+use iced_native::Background;
+
+pub use iced_native::button::State;
+
+/// A widget that produces a message when clicked.
+///
+/// This is an alias of an `iced_native` button with an `iced_wgpu::Renderer`.
+pub type Button<'a, Message> = iced_native::Button<'a, Message, Renderer>;
+
+#[derive(Debug)]
+pub struct Style {
+    pub shadow_offset: f32,
+    pub background: Option<Background>,
+    pub border_radius: u16,
+}
+
+pub trait StyleSheet {
+    fn active(&self) -> Style;
+
+    fn hovered(&self) -> Style {
+        let active = self.active();
+
+        Style {
+            shadow_offset: active.shadow_offset + 1.0,
+            ..active
+        }
+    }
+
+    fn pressed(&self) -> Style {
+        Style {
+            shadow_offset: 0.0,
+            ..self.active()
+        }
+    }
+
+    fn disabled(&self) -> Style {
+        self.active()
+    }
+}
+
+struct Default;
+
+impl StyleSheet for Default {
+    fn active(&self) -> Style {
+        Style {
+            shadow_offset: 1.0,
+            background: Some(Background::Color([0.5, 0.5, 0.5].into())),
+            border_radius: 5,
+        }
+    }
+
+    fn hovered(&self) -> Style {
+        Style {
+            shadow_offset: 2.0,
+            background: Some(Background::Color([0.5, 0.5, 0.5].into())),
+            border_radius: 5,
+        }
+    }
+
+    fn pressed(&self) -> Style {
+        Style {
+            shadow_offset: 0.0,
+            background: Some(Background::Color([0.5, 0.5, 0.5].into())),
+            border_radius: 5,
+        }
+    }
+
+    fn disabled(&self) -> Style {
+        Style {
+            shadow_offset: 0.0,
+            background: Some(Background::Color([0.7, 0.7, 0.7].into())),
+            border_radius: 5,
+        }
+    }
+}
+
+impl std::default::Default for Box<dyn StyleSheet> {
+    fn default() -> Self {
+        Box::new(Default)
+    }
+}
+
+impl<T> From<T> for Box<dyn StyleSheet>
+where
+    T: 'static + StyleSheet,
+{
+    fn from(style: T) -> Self {
+        Box::new(style)
+    }
+}