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use crate::app;
use std::cmp::{max, min};
/// Return a (hard)-width vector for column widths.
///
/// * `total_width` is the, well, total width available. **NOTE:** This function automatically
/// takes away 2 from the width as part of the left/right
/// bounds.
/// * `hard_widths` is inflexible column widths. Use a `None` to represent a soft width.
/// * `soft_widths_min` is the lower limit for a soft width. Use `None` if a hard width goes there.
/// * `soft_widths_max` is the upper limit for a soft width, in percentage of the total width. Use
/// `None` if a hard width goes there.
/// * `soft_widths_desired` is the desired soft width. Use `None` if a hard width goes there.
/// * `left_to_right` is a boolean whether to go from left to right if true, or right to left if
/// false.
///
/// **NOTE:** This function ASSUMES THAT ALL PASSED SLICES ARE OF THE SAME SIZE.
///
/// **NOTE:** The returned vector may not be the same size as the slices, this is because including
/// 0-constraints breaks tui-rs.
pub fn get_column_widths(
total_width: u16, hard_widths: &[Option<u16>], soft_widths_min: &[Option<u16>],
soft_widths_max: &[Option<f64>], soft_widths_desired: &[Option<u16>], left_to_right: bool,
) -> Vec<u16> {
let initial_width = total_width - 2;
let mut total_width_left = initial_width;
let mut column_widths: Vec<u16> = vec![0; hard_widths.len()];
let range: Vec<usize> = if left_to_right {
(0..hard_widths.len()).collect()
} else {
(0..hard_widths.len()).rev().collect()
};
for itx in &range {
if let Some(Some(hard_width)) = hard_widths.get(*itx) {
// Hard width...
let space_taken = min(*hard_width, total_width_left);
// TODO [COLUMN MOVEMENT]: Remove this
if *hard_width > space_taken {
break;
}
column_widths[*itx] = space_taken;
total_width_left -= space_taken;
total_width_left = total_width_left.saturating_sub(1);
} else if let (
Some(Some(soft_width_max)),
Some(Some(soft_width_min)),
Some(Some(soft_width_desired)),
) = (
soft_widths_max.get(*itx),
soft_widths_min.get(*itx),
soft_widths_desired.get(*itx),
) {
// Soft width...
let soft_limit = max(
if soft_width_max.is_sign_negative() {
*soft_width_desired
} else {
(*soft_width_max * initial_width as f64).ceil() as u16
},
*soft_width_min,
);
let space_taken = min(min(soft_limit, *soft_width_desired), total_width_left);
// TODO [COLUMN MOVEMENT]: Remove this
if *soft_width_min > space_taken {
break;
}
column_widths[*itx] = space_taken;
total_width_left -= space_taken;
total_width_left = total_width_left.saturating_sub(1);
}
}
// Redistribute remaining.
while total_width_left > 0 {
for itx in &range {
if column_widths[*itx] > 0 {
column_widths[*itx] += 1;
total_width_left -= 1;
if total_width_left == 0 {
break;
}
}
}
}
let mut filtered_column_widths: Vec<u16> = vec![];
let mut still_seeing_zeros = true;
column_widths.iter().rev().for_each(|width| {
if still_seeing_zeros {
if *width != 0 {
still_seeing_zeros = false;
filtered_column_widths.push(*width);
}
} else {
filtered_column_widths.push(*width);
}
});
filtered_column_widths.reverse();
filtered_column_widths
}
pub fn get_search_start_position(
num_columns: usize, cursor_direction: &app::CursorDirection, cursor_bar: &mut usize,
current_cursor_position: usize, is_force_redraw: bool,
) -> usize {
if is_force_redraw {
*cursor_bar = 0;
}
match cursor_direction {
app::CursorDirection::Right => {
if current_cursor_position < *cursor_bar + num_columns {
// If, using previous_scrolled_position, we can see the element
// (so within that and + num_rows) just reuse the current previously scrolled position
*cursor_bar
} else if current_cursor_position >= num_columns {
// Else if the current position past the last element visible in the list, omit
// until we can see that element
*cursor_bar = current_cursor_position - num_columns;
*cursor_bar
} else {
// Else, if it is not past the last element visible, do not omit anything
0
}
}
app::CursorDirection::Left => {
if current_cursor_position <= *cursor_bar {
// If it's past the first element, then show from that element downwards
*cursor_bar = current_cursor_position;
*cursor_bar
} else if current_cursor_position >= *cursor_bar + num_columns {
*cursor_bar = current_cursor_position - num_columns;
*cursor_bar
} else {
// Else, don't change what our start position is from whatever it is set to!
*cursor_bar
}
}
}
}
pub fn get_start_position(
num_rows: usize, scroll_direction: &app::ScrollDirection, scroll_position_bar: &mut usize,
currently_selected_position: usize, is_force_redraw: bool,
) -> usize {
if is_force_redraw {
*scroll_position_bar = 0;
}
match scroll_direction {
app::ScrollDirection::Down => {
if currently_selected_position < *scroll_position_bar + num_rows {
// If, using previous_scrolled_position, we can see the element
// (so within that and + num_rows) just reuse the current previously scrolled position
*scroll_position_bar
} else if currently_selected_position >= num_rows {
// Else if the current position past the last element visible in the list, omit
// until we can see that element
*scroll_position_bar = currently_selected_position - num_rows;
*scroll_position_bar
} else {
// Else, if it is not past the last element visible, do not omit anything
0
}
}
app::ScrollDirection::Up => {
if currently_selected_position <= *scroll_position_bar {
// If it's past the first element, then show from that element downwards
*scroll_position_bar = currently_selected_position;
*scroll_position_bar
} else if currently_selected_position >= *scroll_position_bar + num_rows {
*scroll_position_bar = currently_selected_position - num_rows;
*scroll_position_bar
} else {
// Else, don't change what our start position is from whatever it is set to!
*scroll_position_bar
}
}
}
}
/// Calculate how many bars are to be
/// drawn within basic mode's components.
pub fn calculate_basic_use_bars(use_percentage: f64, num_bars_available: usize) -> usize {
std::cmp::min(
(num_bars_available as f64 * use_percentage / 100.0).round() as usize,
num_bars_available,
)
}
|
