pim

Unnamed repository; edit this file 'description' to name the repository.
Log | Files | Refs | README

editor.rs (1335B)

      1 #[derive(PartialEq)]
      2 pub enum Mode {
      3     Normal,
      4     Insert,
      5 }
      6 
      7 pub struct Editor {
      8     pub mode: Mode,
      9     pub scroll_offset: usize,
     10     pub cursor_line: usize,
     11     pub cursor_column: usize,
     12 }
     13 
     14 impl Editor {
     15     pub fn new() -> Self {
     16         Self {
     17             mode: Mode::Normal,
     18             scroll_offset: 0,
     19             cursor_line: 0,
     20             cursor_column: 0,
     21         }
     22     }
     23 
     24     pub fn scroll_down(&mut self, total_lines: usize, view_height: usize) {
     25         if self.scroll_offset + view_height < total_lines {
     26             self.scroll_offset += 1;
     27         }
     28     }
     29 
     30     pub fn scroll_up(&mut self) {
     31         if self.scroll_offset > 0 {
     32             self.scroll_offset -= 1;
     33         }
     34     }
     35 
     36     pub fn move_cursor_down(&mut self, total_lines: usize) {
     37         if self.cursor_line + 1 < total_lines {
     38             self.cursor_line += 1;
     39         }
     40     }
     41 
     42     pub fn move_cursor_up(&mut self) {
     43         if self.cursor_line > 0 {
     44             self.cursor_line -= 1;
     45         }
     46     }
     47 
     48     pub fn move_cursor_left(&mut self) {
     49         if self.cursor_column > 0 {
     50             self.cursor_column -= 1;
     51         }
     52     }
     53 
     54     pub fn move_cursor_right(&mut self, line_len: usize) {
     55         if self.cursor_column < line_len {
     56             self.cursor_column += 1;
     57         }
     58     }
     59 }