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pub struct BoxData {
pub max_char_per_line: usize,
pub max_line: usize,
pub nb_line: usize,
pub scroll_offset: usize,
}
pub struct InputField {
pub input: String,
pub input_mode: InputMode,
character_index: usize, // Cursor index in 1D input
pub input_data: BoxData, // InputField data
}
pub enum InputMode {
Normal,
Editing,
}
impl BoxData {
pub fn new() -> Self {
Self {
max_char_per_line: 1,
max_line: 1,
nb_line: 0,
scroll_offset: 0,
}
}
}
impl InputField {
pub fn new() -> Self {
Self {
input: String::new(),
input_mode: InputMode::Normal,
character_index: 0,
input_data: BoxData::new(),
}
}
// Move cursor left in 1D
pub fn move_cursor_left(&mut self) {
let cursor_moved_left = self.character_index.saturating_sub(1);
self.character_index = self.clamp_cursor(cursor_moved_left);
}
// Move cursor right in 1D
pub fn move_cursor_right(&mut self) {
let cursor_moved_right = self.character_index.saturating_add(1);
self.character_index = self.clamp_cursor(cursor_moved_right);
}
// Move cursor in 2D, y-1
pub fn move_cursor_up(&mut self) {
if self.input_data.nb_line > 1 {
let cursor_moved_up = self
.character_index
.saturating_sub(self.input_data.max_char_per_line);
self.character_index = self.clamp_cursor(cursor_moved_up);
}
}
// Move cursor in 2D, y+1
pub fn move_cursor_down(&mut self) {
if self.input_data.nb_line > 1
&& self
.character_index
.saturating_add(self.input_data.max_char_per_line)
< self.input_len()
{
let cursor_moved_down = self
.character_index
.saturating_add(self.input_data.max_char_per_line);
self.character_index = self.clamp_cursor(cursor_moved_down);
}
}
pub fn enter_char(&mut self, new_char: char) {
let index = self.byte_index();
self.input.insert(index, new_char);
self.move_cursor_right();
}
// Limit the character_index between 0 and inputfield characters number
fn clamp_cursor(&self, new_cursor_pos: usize) -> usize {
new_cursor_pos.clamp(0, self.input.chars().count())
}
pub fn reset_char_index(&mut self) {
self.character_index = 0;
self.input_data.scroll_offset = 0;
}
fn byte_index(&self) -> usize {
self.input
.char_indices()
.map(|(i, _)| i)
.nth(self.character_index)
.unwrap_or(self.input.len())
}
pub fn delete_char(&mut self) {
if self.character_index != 0 {
// Method "remove" is not used on the saved text for deleting the selected char.
// Reason: Using remove on String works on bytes instead of the chars.
// Using remove would require special care because of char boundaries.
let current_index = self.character_index;
let from_left_to_current_index = current_index - 1;
// Getting all characters before the selected character.
let before_char_to_delete = self.input.chars().take(from_left_to_current_index);
// Getting all characters after selected character.
let after_char_to_delete = self.input.chars().skip(current_index);
// Put all characters together except the selected one.
// By leaving the selected one out, it is forgotten and therefore deleted.
self.input = before_char_to_delete.chain(after_char_to_delete).collect();
self.move_cursor_left();
}
}
// Get the max chars allowed per line (not trustable while a line is not completed) and the max
// line allowed
pub fn update_max(&mut self, area_width: u16, area_height: u16) {
let available_width = area_width.saturating_sub(2); // Retirer les bordures
self.input_data.max_char_per_line =
self.input.chars().take(available_width as usize).count();
self.input_data.max_line = area_height.saturating_sub(2) as usize; // retirer les bordures
}
// Get the number of line needed for the inputfield text
pub fn update_nb_line(&mut self, area_width: u16) {
let available_width = area_width.saturating_sub(2); // Retirer les bordures
self.input_data.nb_line =
(self.input.chars().count() as f64 / available_width as f64).ceil() as usize;
}
pub fn input_len(&mut self) -> usize {
self.input.chars().count()
}
// Calculate cursor_y position
pub fn cursor_y(&mut self) -> usize {
if self.input_data.nb_line > 1 {
let mut y = (self.character_index / self.input_data.max_char_per_line) + 1;
// Offsetting the inputfield for y be inside
if y > self.input_data.max_line {
self.input_data.scroll_offset = y - self.input_data.max_line;
y -= self.input_data.scroll_offset;
}
if y < self.input_data.scroll_offset {
self.input_data.scroll_offset = y;
}
return y.max(1);
} else {
return 1;
}
}
// Calculate cursor_x position
pub fn cursor_x(&mut self) -> usize {
if self.input_data.nb_line > 1 {
return self.character_index % self.input_data.max_char_per_line;
} else {
return self.character_index;
}
}
}
|
