Add Background widget

showbits-common/src/view.rs

@@ -22,16 +22,11 @@ impl<'a, C> View<'a, C> {
         }
     }
 
-    pub fn with_area(mut self, area: Rect) -> Self {
-        self.area = area;
+    pub fn zoom(mut self, area: Rect) -> Self {
+        self.area = area + self.area.corner_nw();
         self
     }
 
-    pub fn translated(self, delta: Vec2) -> Self {
-        let area = self.area + delta;
-        self.with_area(area)
-    }
-
     pub fn size(&self) -> Vec2 {
         self.area.size()
     }

showbits-common/src/widget.rs

@@ -1,4 +1,4 @@
-use crate::{Rect, Vec2, View};
+use crate::{widgets::Background, Rect, Vec2, View};
 
 pub trait Widget<C> {
     /// Size that the widget wants to be, given the width and height
@@ -26,6 +26,20 @@ pub trait Widget<C> {
     fn draw(self, view: &mut View<'_, C>);
 }
 
+/// Extension trait for [`Widget`]s.
+pub trait WidgetExt<C> {
+    fn boxed(self) -> BoxedWidget<C>;
+}
+
+impl<C, W> WidgetExt<C> for W
+where
+    W: Widget<C> + 'static,
+{
+    fn boxed(self) -> BoxedWidget<C> {
+        BoxedWidget::new(self)
+    }
+}
+
 /// Wrapper trait around [`Widget`] that turns `Box<Self>` into a `Self` to get
 /// around the "size cannot be statically determined" error with the naïve
 /// approach of `Box<Widget>`.
@@ -77,22 +91,30 @@ impl<C> BoxedWidget<C> {
     pub fn area(&self) -> Rect {
         self.area
     }
-}
 
-impl<C> Widget<C> for BoxedWidget<C> {
-    fn size(&self, max_width: Option<i32>, max_height: Option<i32>) -> Vec2 {
+    // Widget-like functions
+
+    pub fn size(&self, max_width: Option<i32>, max_height: Option<i32>) -> Vec2 {
         self.widget.size(max_width, max_height)
     }
 
-    fn resize(&mut self, area: Rect) {
+    pub fn resize(&mut self, area: Rect) {
+        self.area = area;
         self.widget.resize(area);
     }
 
-    fn update(&mut self, area: Rect) -> anyhow::Result<()> {
-        self.widget.update(area)
+    pub fn update(&mut self) -> anyhow::Result<()> {
+        self.widget.update(self.area)
     }
 
-    fn draw(self, view: &mut View<'_, C>) {
-        self.widget.draw(view);
+    pub fn draw(self, view: &mut View<'_, C>) {
+        let mut view = view.dup().zoom(self.area);
+        self.widget.draw(&mut view);
+    }
+
+    // Widget constructors
+
+    pub fn background(self, color: C) -> Background<C> {
+        Background::new(self, color)
     }
 }

showbits-common/src/widgets.rs

@@ -1,3 +1,5 @@
-pub use empty::Empty;
+pub use background::*;
+pub use empty::*;
 
+mod background;
 mod empty;

showbits-common/src/widgets/background.rs

@@ -0,0 +1,34 @@
+use crate::{BoxedWidget, Vec2, Widget};
+
+pub struct Background<C> {
+    inner: BoxedWidget<C>,
+    color: C,
+}
+
+impl<C> Background<C> {
+    pub fn new(inner: BoxedWidget<C>, color: C) -> Self {
+        Self { inner, color }
+    }
+}
+
+impl<C: Copy> Widget<C> for Background<C> {
+    fn size(&self, max_width: Option<i32>, max_height: Option<i32>) -> crate::Vec2 {
+        self.inner.size(max_width, max_height)
+    }
+
+    fn resize(&mut self, area: crate::Rect) {
+        self.inner.resize(area);
+    }
+
+    fn update(&mut self, _area: crate::Rect) -> anyhow::Result<()> {
+        Ok(())
+    }
+
+    fn draw(self, view: &mut crate::View<'_, C>) {
+        for y in 0..view.size().y {
+            for x in 0..view.size().x {
+                view.set(Vec2::new(x, y), self.color);
+            }
+        }
+    }
+}