Redraws the rendered viewport and places the cursor at the desired offset.
(&mut self, old_pos: usize, clear_len: usize, new_pos: usize)
| 88 | |
| 89 | /// Redraws the rendered viewport and places the cursor at the desired offset. |
| 90 | fn redraw_line(&mut self, old_pos: usize, clear_len: usize, new_pos: usize) -> io::Result<()> { |
| 91 | self.console.hide_cursor()?; |
| 92 | if old_pos > 0 { |
| 93 | self.console.move_within_line(-(old_pos as i16))?; |
| 94 | } |
| 95 | if !self.rendered.is_empty() { |
| 96 | self.console.write(&self.rendered)?; |
| 97 | } |
| 98 | let written_len = self.rendered_len.max(clear_len); |
| 99 | if self.rendered_len < clear_len { |
| 100 | let diff = clear_len - self.rendered_len; |
| 101 | self.console.write(&" ".repeat(diff))?; |
| 102 | } |
| 103 | debug_assert!(new_pos <= written_len); |
| 104 | let reset = written_len - new_pos; |
| 105 | if reset > 0 { |
| 106 | self.console.move_within_line(-(reset as i16))?; |
| 107 | } |
| 108 | self.console.show_cursor() |
| 109 | } |
| 110 | |
| 111 | /// Erases a character and redraws the visible tail of the line. |
| 112 | fn erase_at(&mut self, cursor_pos: usize, remove_pos: usize) -> io::Result<()> { |
no test coverage detected