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add basic scrolling

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This commit is contained in:
Crispy 2023-02-26 20:27:50 +01:00
parent 856951a7a0
commit 586354509b
1 changed files with 14 additions and 3 deletions
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17
src/editor.rs
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@ -17,6 +17,7 @@ const TAB_SIZE: usize = 4;
pub struct Editor {
text: String,
lines: Vec<Line>,
scroll: usize,
cursor: Cursor,
path: Option<String>,
term: RawTerminal<Stdout>,
@ -49,6 +50,7 @@ impl Editor {
Editor {
text,
lines: Vec::new(),
scroll: 0,
cursor: Cursor { line: 0, column: 0 },
term,
path,
@ -116,6 +118,9 @@ impl Editor {
self.cursor.line -= 1;
self.cursor.column = physical_column.min(self.current_line().len());
self.ensure_char_boundary();
if self.cursor.line < self.scroll {
self.scroll -= 1;
}
}
}
@ -128,6 +133,9 @@ impl Editor {
self.cursor.line += 1;
self.cursor.column = physical_column.min(self.current_line().len());
self.ensure_char_boundary();
if self.cursor.line > (self.scroll + terminal_size().unwrap().1 as usize - 2) {
self.scroll += 1;
}
}
}
@ -162,11 +170,14 @@ impl Editor {
fn draw(&self) {
print!("{}", clear::All);
for (row, line) in self.lines.iter().enumerate() {
let max_rows = terminal_size().unwrap().1 as usize - 1;
let visible_rows = self.scroll..(self.scroll + max_rows);
for (line_index, line) in self.lines[visible_rows].iter().enumerate() {
let text = &self.text[line.clone()];
print!(
"{}{}",
cursor::Goto(1, row as u16 + 1),
cursor::Goto(1, line_index as u16 + 1),
text.replace('\t', &" ".repeat(TAB_SIZE))
);
}
@ -181,7 +192,7 @@ impl Editor {
"{}",
cursor::Goto(
self.physical_column() as u16 + 1,
self.cursor.line as u16 + 1
(self.cursor.line - self.scroll) as u16 + 1
)
);
stdout().flush().unwrap();