add page up/down faster scroll
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parent
306ee70381
commit
79e4364f5a
1 changed files with 41 additions and 28 deletions
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@ -144,6 +144,8 @@ impl Editor {
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| KeyCode::Up
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| KeyCode::Down
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| KeyCode::Home
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| KeyCode::PageUp
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| KeyCode::PageDown
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| KeyCode::End = event.code
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{
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if event.modifiers.contains(KeyModifiers::SHIFT) {
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@ -151,11 +153,14 @@ impl Editor {
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} else {
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self.marker = None;
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}
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let height = terminal::size().unwrap().1 as usize;
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match event.code {
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KeyCode::Left => self.move_left(),
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KeyCode::Right => self.move_right(),
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KeyCode::Up => self.move_up(),
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KeyCode::Down => self.move_down(),
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KeyCode::Up => self.move_up(1),
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KeyCode::Down => self.move_down(1),
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KeyCode::PageUp => self.move_up(height),
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KeyCode::PageDown => self.move_down(height),
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KeyCode::Home => self.move_home(),
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KeyCode::End => self.move_end(),
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_ => (),
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@ -234,6 +239,7 @@ impl Editor {
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self.cursor.line -= 1;
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self.cursor.column = self.current_line().len();
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}
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self.scroll_to_cursor()
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}
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fn move_right(&mut self) {
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@ -243,36 +249,43 @@ impl Editor {
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self.cursor.line += 1;
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self.cursor.column = 0;
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}
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self.scroll_to_cursor()
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}
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fn move_up(&mut self) {
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if self.cursor.line > 0 {
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let physical_column = self.text
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[self.current_line().start..(self.current_line().start + self.cursor.column)]
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.chars()
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.count();
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self.cursor.line -= 1;
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self.cursor.column = physical_column.min(self.current_line().len());
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self.ensure_char_boundary();
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if self.cursor.line < self.scroll {
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self.scroll -= 1;
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}
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}
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fn move_up(&mut self, lines: usize) {
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let physical_column = self.text
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[self.current_line().start..(self.current_line().start + self.cursor.column)]
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.chars()
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.count();
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self.cursor.line = self.cursor.line.saturating_sub(lines);
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self.cursor.column = physical_column.min(self.current_line().len());
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self.ensure_char_boundary();
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self.scroll_to_cursor();
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}
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fn move_down(&mut self) {
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if self.cursor.line < self.lines.len() - 1 {
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let physical_column = self.text
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[self.current_line().start..(self.current_line().start + self.cursor.column)]
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.chars()
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.count();
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self.cursor.line += 1;
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self.cursor.column = physical_column.min(self.current_line().len());
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self.ensure_char_boundary();
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if self.cursor.line > (self.scroll + terminal::size().unwrap().1 as usize - 2) {
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self.scroll += 1;
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}
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}
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fn move_down(&mut self, lines: usize) {
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let physical_column = self.text
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[self.current_line().start..(self.current_line().start + self.cursor.column)]
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.chars()
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.count();
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self.cursor.line = (self.cursor.line + lines).min(self.lines.len() - 1);
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self.cursor.column = physical_column.min(self.current_line().len());
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self.ensure_char_boundary();
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self.scroll_to_cursor();
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}
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fn scroll_to_cursor(&mut self) {
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// while self.cursor.line < self.scroll {
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// self.scroll -= 1;
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// }
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// while self.cursor.line > (self.scroll + terminal::size().unwrap().1 as usize - 2) {
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// self.scroll += 1;
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// }
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self.scroll = self.scroll.min(self.cursor.line);
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let height = terminal::size().unwrap().1 as usize - 2;
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self.scroll = self
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.scroll
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.max(self.scroll + self.cursor.line.saturating_sub(self.scroll + height));
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}
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fn move_home(&mut self) {
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