chore: revert new on Scrollable

but due to limitation of rustc
rust-lang/rust#20400
we can't have two new functions based on non-overlapping associated types

src/bin/ui/scrollable/markdown/mod.rs

@@ -1,4 +1,5 @@
 use super::Scrollable;
+use crate::Result;
 use ratatui::layout::Rect;
 use std::{fmt, ops::Deref};
 use term_rustdoc::tree::Text as StyledText;
@@ -44,3 +45,14 @@ impl StyledLines {
  parse::md(doc)
  }
 }
+
+impl ScrollText {
+ pub fn new_text(doc: &str, area: Rect) -> Result<Self> {
+ // TODO:max_windth and text wrap for markdown
+ Ok(Scrollable {
+ lines: StyledLines::new(doc),
+ area,
+ ..Default::default()
+ })
+ }
+}

src/bin/ui/scrollable/mod.rs

@@ -60,25 +60,22 @@ impl<Lines: Default> Default for Scrollable<Lines> {
  }
 }
 
-impl<Lines: Deref<Target = [TreeLine]>> Scrollable<Lines> {
- pub fn new(lines: Lines, full: Rect) -> Result<Self> {
+impl<Lines: Default + Deref<Target = [TreeLine]>> Scrollable<Lines> {
+ pub fn new(lines: Lines, area: Rect) -> Result<Self> {
  let w = lines.as_ref().iter().map(TreeLine::width).max();
  let max_windth = w.ok_or_else(|| err!("The documentation is empty with no items."))?;
- if full.width < max_windth {
+ if area.width < max_windth {
  warn!(
- full.width,
+ area.width,
  max_windth, "Outline width exceeds the area width, so lines may be truncated."
  );
  }
 
- let (start, cursor, select) = Default::default();
  Ok(Self {
  lines,
  max_windth,
- area: full,
- start,
- cursor,
- select,
+ area,
+ ..Default::default()
  })
  }
 }