diff --git a/src/list.rs b/src/list.rs index e360182..a8e5225 100644 --- a/src/list.rs +++ b/src/list.rs @@ -59,9 +59,7 @@ fn handle_list(app_state: &mut AppState, stdout: &mut StdoutLock) -> Result<()> list_state.message.push_str(message); } - KeyCode::Char('r') => { - list_state.reset_selected()?; - } + KeyCode::Char('r') => list_state.reset_selected()?, KeyCode::Char('c') => { if list_state.selected_to_current_exercise()? { return Ok(()); @@ -77,9 +75,7 @@ fn handle_list(app_state: &mut AppState, stdout: &mut StdoutLock) -> Result<()> MouseEventKind::ScrollUp => list_state.select_previous(), _ => continue, }, - Event::Resize(width, height) => { - list_state.set_term_size(width, height); - } + Event::Resize(width, height) => list_state.set_term_size(width, height), // Ignore Event::FocusGained | Event::FocusLost => continue, } diff --git a/src/list/state.rs b/src/list/state.rs index cbca1d9..b8fdfcb 100644 --- a/src/list/state.rs +++ b/src/list/state.rs @@ -15,20 +15,21 @@ use crate::{app_state::AppState, exercise::Exercise, term::progress_bar, MAX_EXE // +1 for padding. const SPACE: &[u8] = &[b' '; MAX_EXERCISE_NAME_LEN + 1]; -fn next_ln(stdout: &mut StdoutLock) -> io::Result<()> { - if CLEAR_LAST_CHAR { - // Avoids having the last written char as the last displayed one when - // the written width is higher than the terminal width. - // Happens on the Gnome terminal for example. - stdout.write_all(b" ")?; - } - +fn next_ln(stdout: &mut StdoutLock) -> io::Result<()> { stdout .queue(Clear(ClearType::UntilNewLine))? .queue(MoveToNextLine(1))?; Ok(()) } +// Avoids having the last written char as the last displayed one when the +// written width is higher than the terminal width. +// Happens on the Gnome terminal for example. +fn next_ln_overwrite(stdout: &mut StdoutLock) -> io::Result<()> { + stdout.write_all(b" ")?; + next_ln(stdout) +} + #[derive(Copy, Clone, PartialEq, Eq)] pub enum Filter { Done, @@ -37,65 +38,111 @@ pub enum Filter { } pub struct ListState<'a> { + /// Footer message to be displayed if not empty. pub message: String, - filter: Filter, app_state: &'a mut AppState, - n_rows_with_filter: usize, name_col_width: usize, - offset: usize, - selected: Option, + filter: Filter, + n_rows_with_filter: usize, + /// Selected row out of the displayed ones. + selected_row: Option, term_width: u16, term_height: u16, - separator: Vec, + separator_line: Vec, + narrow_term: bool, + show_footer: bool, + max_n_rows_to_display: usize, + scroll_padding: usize, + row_offset: usize, } impl<'a> ListState<'a> { pub fn new(app_state: &'a mut AppState, stdout: &mut StdoutLock) -> io::Result { - let (term_width, term_height) = terminal::size()?; stdout.queue(Clear(ClearType::All))?; + let name_col_title_len = 4; let name_col_width = app_state .exercises() .iter() .map(|exercise| exercise.name.len()) .max() - .map_or(4, |max| max.max(4)); + .map_or(name_col_title_len, |max| max.max(name_col_title_len)); + let filter = Filter::None; let n_rows_with_filter = app_state.exercises().len(); - let selected = app_state.current_exercise_ind(); + let selected = Some(app_state.current_exercise_ind()); let mut slf = Self { message: String::with_capacity(128), - filter: Filter::None, app_state, - n_rows_with_filter, name_col_width, - offset: selected.saturating_sub(10), - selected: Some(selected), - term_width, - term_height, - separator: "─".as_bytes().repeat(term_width as usize), + filter, + n_rows_with_filter, + selected_row: selected, + // Set by `set_term_size` + term_width: 0, + term_height: 0, + separator_line: Vec::new(), + narrow_term: false, + show_footer: true, + max_n_rows_to_display: 0, + scroll_padding: 0, + // Updated by `draw` + row_offset: 0, }; + let (width, height) = terminal::size()?; + slf.set_term_size(width, height); slf.draw(stdout)?; Ok(slf) } + pub fn set_term_size(&mut self, width: u16, height: u16) { + self.term_width = width; + self.term_height = height; + + self.separator_line = "─".as_bytes().repeat(width as usize); + + self.narrow_term = width < 95 && self.selected_row.is_some(); + self.show_footer = height > 6; + self.max_n_rows_to_display = + (height - 1 - u16::from(self.show_footer) * (4 + u16::from(self.narrow_term))) as usize; + self.scroll_padding = (self.max_n_rows_to_display / 4).min(5); + } + + fn update_offset(&mut self) { + let Some(selected) = self.selected_row else { + return; + }; + + let min_offset = (selected + self.scroll_padding) + .saturating_sub(self.max_n_rows_to_display.saturating_sub(1)); + let max_offset = selected.saturating_sub(self.scroll_padding); + let global_max_offset = self + .n_rows_with_filter + .saturating_sub(self.max_n_rows_to_display); + + self.row_offset = self + .row_offset + .max(min_offset) + .min(max_offset) + .min(global_max_offset); + } + fn draw_rows( &self, stdout: &mut StdoutLock, - max_n_rows_to_display: usize, filtered_exercises: impl Iterator, ) -> io::Result { let current_exercise_ind = self.app_state.current_exercise_ind(); let mut n_displayed_rows = 0; for (exercise_ind, exercise) in filtered_exercises - .skip(self.offset) - .take(max_n_rows_to_display) + .skip(self.row_offset) + .take(self.max_n_rows_to_display) { - if self.selected == Some(n_displayed_rows) { + if self.selected_row == Some(self.row_offset + n_displayed_rows) { stdout.queue(SetBackgroundColor(Color::Rgb { r: 50, g: 50, @@ -128,7 +175,7 @@ impl<'a> ListState<'a> { stdout.write_all(exercise.path.as_bytes())?; - next_ln::(stdout)?; + next_ln_overwrite(stdout)?; stdout.queue(ResetColor)?; n_displayed_rows += 1; } @@ -147,36 +194,27 @@ impl<'a> ListState<'a> { stdout.write_all(b" Current State Name")?; stdout.write_all(&SPACE[..self.name_col_width - 2])?; stdout.write_all(b"Path")?; - next_ln::(stdout)?; + next_ln_overwrite(stdout)?; - let narrow = self.term_width < 95; - let show_footer = self.term_height > 6; - let max_n_rows_to_display = - (self.term_height - 1 - u16::from(show_footer) * (4 + u16::from(narrow))) as usize; + self.update_offset(); // Rows let iter = self.app_state.exercises().iter().enumerate(); let n_displayed_rows = match self.filter { - Filter::Done => self.draw_rows( - stdout, - max_n_rows_to_display, - iter.filter(|(_, exercise)| exercise.done), - )?, - Filter::Pending => self.draw_rows( - stdout, - max_n_rows_to_display, - iter.filter(|(_, exercise)| !exercise.done), - )?, - Filter::None => self.draw_rows(stdout, max_n_rows_to_display, iter)?, + Filter::Done => self.draw_rows(stdout, iter.filter(|(_, exercise)| exercise.done))?, + Filter::Pending => { + self.draw_rows(stdout, iter.filter(|(_, exercise)| !exercise.done))? + } + Filter::None => self.draw_rows(stdout, iter)?, }; - for _ in 0..max_n_rows_to_display - n_displayed_rows { - next_ln::(stdout)?; + for _ in 0..self.max_n_rows_to_display - n_displayed_rows { + next_ln(stdout)?; } - if show_footer { - stdout.write_all(&self.separator)?; - next_ln::(stdout)?; + if self.show_footer { + stdout.write_all(&self.separator_line)?; + next_ln(stdout)?; progress_bar( stdout, @@ -184,21 +222,25 @@ impl<'a> ListState<'a> { self.app_state.exercises().len() as u16, self.term_width, )?; - next_ln::(stdout)?; + next_ln(stdout)?; - stdout.write_all(&self.separator)?; - next_ln::(stdout)?; + stdout.write_all(&self.separator_line)?; + next_ln(stdout)?; if self.message.is_empty() { // Help footer - stdout.write_all( - "↓/j ↑/k home/g end/G │ ontinue at │ eset exercise │".as_bytes(), - )?; - if narrow { - next_ln::(stdout)?; - stdout.write_all(b"filter ")?; + if self.selected_row.is_some() { + stdout.write_all( + "↓/j ↑/k home/g end/G | ontinue at | eset exercise".as_bytes(), + )?; + if self.narrow_term { + next_ln_overwrite(stdout)?; + stdout.write_all(b"filter ")?; + } else { + stdout.write_all(b" | filter ")?; + } } else { - stdout.write_all(b" filter ")?; + stdout.write_all(b"filter ")?; } match self.filter { @@ -220,19 +262,19 @@ impl<'a> ListState<'a> { } Filter::None => stdout.write_all(b"one/

ending")?, } - stdout.write_all(" │ uit list".as_bytes())?; - if narrow { - next_ln::(stdout)?; + stdout.write_all(b" | uit list")?; + if self.narrow_term { + next_ln_overwrite(stdout)?; } else { - next_ln::(stdout)?; + next_ln(stdout)?; } } else { stdout.queue(SetForegroundColor(Color::Magenta))?; stdout.write_all(self.message.as_bytes())?; stdout.queue(ResetColor)?; - next_ln::(stdout)?; - if narrow { - next_ln::(stdout)?; + next_ln_overwrite(stdout)?; + if self.narrow_term { + next_ln(stdout)?; } } } @@ -240,20 +282,8 @@ impl<'a> ListState<'a> { stdout.queue(EndSynchronizedUpdate)?.flush() } - pub fn set_term_size(&mut self, width: u16, height: u16) { - self.term_width = width; - self.term_height = height; - self.separator = "─".as_bytes().repeat(width as usize); - } - - #[inline] - pub fn filter(&self) -> Filter { - self.filter - } - - pub fn set_filter(&mut self, filter: Filter) { - self.filter = filter; - self.n_rows_with_filter = match filter { + fn update_rows(&mut self) { + self.n_rows_with_filter = match self.filter { Filter::Done => self .app_state .exercises() @@ -270,42 +300,46 @@ impl<'a> ListState<'a> { }; if self.n_rows_with_filter == 0 { - self.selected = None; + self.selected_row = None; } else { - self.selected = Some( - self.selected + self.selected_row = Some( + self.selected_row .map_or(0, |selected| selected.min(self.n_rows_with_filter - 1)), ); } } + #[inline] + pub fn filter(&self) -> Filter { + self.filter + } + + pub fn set_filter(&mut self, filter: Filter) { + self.filter = filter; + self.update_rows(); + } + pub fn select_next(&mut self) { - if self.n_rows_with_filter > 0 { - let next = self.selected.map_or(0, |selected| { - (selected + 1).min(self.n_rows_with_filter - 1) - }); - self.selected = Some(next); + if let Some(selected) = self.selected_row { + self.selected_row = Some((selected + 1).min(self.n_rows_with_filter - 1)); } } pub fn select_previous(&mut self) { - if self.n_rows_with_filter > 0 { - let previous = self - .selected - .map_or(0, |selected| selected.saturating_sub(1)); - self.selected = Some(previous); + if let Some(selected) = self.selected_row { + self.selected_row = Some(selected.saturating_sub(1)); } } pub fn select_first(&mut self) { if self.n_rows_with_filter > 0 { - self.selected = Some(0); + self.selected_row = Some(0); } } pub fn select_last(&mut self) { if self.n_rows_with_filter > 0 { - self.selected = Some(self.n_rows_with_filter - 1); + self.selected_row = Some(self.n_rows_with_filter - 1); } } @@ -334,13 +368,14 @@ impl<'a> ListState<'a> { } pub fn reset_selected(&mut self) -> Result<()> { - let Some(selected) = self.selected else { + let Some(selected) = self.selected_row else { self.message.push_str("Nothing selected to reset!"); return Ok(()); }; let exercise_ind = self.selected_to_exercise_ind(selected)?; let exercise_path = self.app_state.reset_exercise_by_ind(exercise_ind)?; + self.update_rows(); write!(self.message, "The exercise {exercise_path} has been reset")?; Ok(()) @@ -348,13 +383,14 @@ impl<'a> ListState<'a> { // Return `true` if there was something to select. pub fn selected_to_current_exercise(&mut self) -> Result { - let Some(selected) = self.selected else { + let Some(selected) = self.selected_row else { self.message.push_str("Nothing selected to continue at!"); return Ok(false); }; let exercise_ind = self.selected_to_exercise_ind(selected)?; self.app_state.set_current_exercise_ind(exercise_ind)?; + Ok(true) } }