wip: component refactor

src/layout/container.rs

@@ -0,0 +1,61 @@
+use crate::prelude::*;
+
+pub struct Column(pub Vec<Box<dyn Device>>);
+
+impl Column {
+    pub fn new (items: Vec<Box<dyn Device>>) -> Self {
+        Self(items)
+    }
+}
+
+pub struct Row(pub Vec<Box<dyn Device>>);
+
+impl Row {
+    pub fn new (items: Vec<Box<dyn Device>>) -> Self {
+        Self(items)
+    }
+}
+
+impl Device for Column {
+    fn render (&self, buf: &mut Buffer, area: Rect) -> Usually<Rect> {
+        Ok(render_column(&self.0, buf, area)?.0)
+    }
+}
+
+impl Device for Row {
+    fn render (&self, buf: &mut Buffer, area: Rect) -> Usually<Rect> {
+        Ok(render_row(&self.0, buf, area)?.0)
+    }
+}
+
+pub fn render_column (items: &[Box<dyn Device>], buf: &mut Buffer, area: Rect)
+    -> Usually<(Rect, Vec<Rect>)>
+{
+    let mut w = 0u16;
+    let mut h = 0u16;
+    let mut rects = vec![];
+    for (i, device) in items.iter().enumerate() {
+        let rect = Rect { x: area.x, y: area.y + h, width: area.width, height: area.height - h };
+        let result = device.render(buf, rect)?;
+        rects.push(result);
+        w = w.max(result.width);
+        h = h + result.height;
+    }
+    Ok((Rect { x: area.x, y: area.y, width: w, height: h }, rects))
+}
+
+pub fn render_row (items: &[Box<dyn Device>], buf: &mut Buffer, area: Rect)
+    -> Usually<(Rect, Vec<Rect>)>
+{
+    let mut w = 0u16;
+    let mut h = 0u16;
+    let mut rects = vec![];
+    for (i, device) in items.iter().enumerate() {
+        let rect = Rect { x: area.x + w, y: area.y, width: area.width - w, height: area.height };
+        let result = device.render(buf, rect)?;
+        rects.push(result);
+        w = w + result.width;
+        h = h.max(result.height);
+    }
+    Ok((Rect { x: area.x, y: area.y, width: w, height: h }, rects))
+}