Add Text widget

src/ui/widgets/text.rs

@@ -0,0 +1,59 @@
+use async_trait::async_trait;
+use toss::frame::{Frame, Pos, Size};
+use toss::styled::Styled;
+
+use super::Widget;
+
+pub struct Text {
+    styled: Styled,
+    wrap: bool,
+}
+
+impl Text {
+    pub fn new<S: Into<Styled>>(styled: S) -> Self {
+        Self {
+            styled: styled.into(),
+            wrap: false,
+        }
+    }
+
+    pub fn wrap(mut self) -> Self {
+        self.wrap = true;
+        self
+    }
+
+    fn wrapped(&self, frame: &mut Frame, max_width: Option<u16>) -> Vec<Styled> {
+        let max_width = if self.wrap {
+            max_width.map(|w| w as usize).unwrap_or(usize::MAX)
+        } else {
+            usize::MAX
+        };
+
+        let indices = frame.wrap(&self.styled.text(), max_width);
+        self.styled.clone().split_at_indices(&indices)
+    }
+}
+
+#[async_trait]
+impl Widget for Text {
+    fn size(&self, frame: &mut Frame, max_width: Option<u16>, _max_height: Option<u16>) -> Size {
+        let lines = self.wrapped(frame, max_width);
+        let min_width = lines
+            .iter()
+            .map(|l| frame.width(&l.text()))
+            .max()
+            .unwrap_or(0);
+        let min_height = lines.len();
+        Size::new(min_width as u16, min_height as u16)
+    }
+
+    async fn render(&self, frame: &mut Frame, pos: Pos, size: Size) {
+        for (i, line) in self
+            .wrapped(frame, Some(size.width))
+            .into_iter()
+            .enumerate()
+        {
+            frame.write(pos + Pos::new(0, i as i32), line);
+        }
+    }
+}