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|
use tui::layout::Rect;
use crate::app::{self};
use std::{
cmp::{max, min},
time::Instant,
};
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;
} else if current_cursor_position >= *cursor_bar + num_columns {
*cursor_bar = current_cursor_position - num_columns;
}
// Else, don't change what our start position is from whatever it is set to!
*cursor_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,
)
}
/// Determine whether a graph x-label should be hidden.
pub fn should_hide_x_label(
always_hide_time: bool, autohide_time: bool, timer: &mut Option<Instant>, draw_loc: Rect,
) -> bool {
use crate::constants::*;
if always_hide_time || (autohide_time && timer.is_none()) {
true
} else if let Some(time) = timer {
if Instant::now().duration_since(*time).as_millis() < AUTOHIDE_TIMEOUT_MILLISECONDS.into() {
false
} else {
*timer = None;
true
}
} else {
draw_loc.height < TIME_LABEL_HEIGHT_LIMIT
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_calculate_basic_use_bars() {
// Testing various breakpoints and edge cases.
assert_eq!(calculate_basic_use_bars(0.0, 15), 0);
assert_eq!(calculate_basic_use_bars(1.0, 15), 0);
assert_eq!(calculate_basic_use_bars(5.0, 15), 1);
assert_eq!(calculate_basic_use_bars(10.0, 15), 2);
assert_eq!(calculate_basic_use_bars(40.0, 15), 6);
assert_eq!(calculate_basic_use_bars(45.0, 15), 7);
assert_eq!(calculate_basic_use_bars(50.0, 15), 8);
assert_eq!(calculate_basic_use_bars(100.0, 15), 15);
assert_eq!(calculate_basic_use_bars(150.0, 15), 15);
}
#[test]
fn test_should_hide_x_label() {
use crate::constants::*;
use std::time::{Duration, Instant};
use tui::layout::Rect;
let rect = Rect::new(0, 0, 10, 10);
let small_rect = Rect::new(0, 0, 10, 6);
let mut under_timer = Some(Instant::now());
let mut over_timer =
Instant::now().checked_sub(Duration::from_millis(AUTOHIDE_TIMEOUT_MILLISECONDS + 100));
assert!(should_hide_x_label(true, false, &mut None, rect));
assert!(should_hide_x_label(false, true, &mut None, rect));
assert!(should_hide_x_label(false, false, &mut None, small_rect));
assert!(!should_hide_x_label(
false,
true,
&mut under_timer,
small_rect
));
assert!(under_timer.is_some());
assert!(should_hide_x_label(
false,
true,
&mut over_timer,
small_rect
));
assert!(over_timer.is_none());
}
}
|
