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use std::cmp::max;
use std::rc::Rc;
use unicode_width::UnicodeWidthStr;
use crate::highlight::Highlight;
use crate::ui_model::UiModel;
pub struct ModelLayout {
pub model: UiModel,
rows_filled: usize,
cols_filled: usize,
lines: Vec<Vec<(Rc<Highlight>, Vec<String>)>>,
}
impl ModelLayout {
const ROWS_STEP: usize = 10;
pub fn new(columns: u64) -> Self {
ModelLayout {
model: UiModel::new(ModelLayout::ROWS_STEP as u64, columns),
rows_filled: 0,
cols_filled: 0,
lines: Vec::new(),
}
}
pub fn layout_append(&mut self, mut lines: Vec<Vec<(Rc<Highlight>, Vec<String>)>>) {
let rows_filled = self.rows_filled;
let take_from = self.lines.len();
self.lines.append(&mut lines);
self.layout_replace(rows_filled, take_from);
}
pub fn layout(&mut self, lines: Vec<Vec<(Rc<Highlight>, Vec<String>)>>) {
self.lines = lines;
self.layout_replace(0, 0);
}
pub fn set_cursor(&mut self, col: usize) {
let row = if self.rows_filled > 0 {
self.rows_filled - 1
} else {
0
};
self.model.set_cursor(row, col);
}
pub fn size(&self) -> (usize, usize) {
(
max(self.cols_filled, self.model.get_cursor().1 + 1),
self.rows_filled,
)
}
fn check_model_size(&mut self, rows: usize) {
if rows > self.model.rows {
let model_cols = self.model.columns;
let model_rows = ((rows / (ModelLayout::ROWS_STEP + 1)) + 1) * ModelLayout::ROWS_STEP;
let (cur_row, cur_col) = self.model.get_cursor();
let mut model = UiModel::new(model_rows as u64, model_cols as u64);
self.model.swap_rows(&mut model, self.rows_filled - 1);
model.set_cursor(cur_row, cur_col);
self.model = model;
}
}
pub fn insert_char(&mut self, ch: String, shift: bool, hl: Rc<Highlight>) {
if ch.is_empty() {
return;
}
let (row, col) = self.model.get_cursor();
if shift {
self.insert_into_lines(ch);
self.layout_replace(0, 0);
} else {
self.model.put_one(row, col, &ch, false, hl);
}
}
fn insert_into_lines(&mut self, ch: String) {
let line = &mut self.lines[0];
let cur_col = self.model.cur_col;
let mut col_idx = 0;
for &mut (_, ref mut chars) in line {
if cur_col < col_idx + chars.len() {
let col_sub_idx = cur_col - col_idx;
chars.insert(col_sub_idx, ch);
break;
} else {
col_idx += chars.len();
}
}
}
fn layout_replace(&mut self, row_offset: usize, take_from: usize) {
let rows = ModelLayout::count_lines(&self.lines[take_from..], self.model.columns);
self.check_model_size(rows + row_offset);
self.rows_filled = rows + row_offset;
let lines = &self.lines[take_from..];
let mut max_col_idx = 0;
let mut col_idx = 0;
let mut row_idx = row_offset;
for content in lines {
for &(ref hl, ref ch_list) in content {
for ch in ch_list {
let ch_width = max(1, ch.width());
if col_idx + ch_width > self.model.columns {
col_idx = 0;
row_idx += 1;
}
self.model.put_one(row_idx, col_idx, ch, false, hl.clone());
if ch_width > 1 {
self.model.put_one(row_idx, col_idx, "", true, hl.clone());
}
if max_col_idx < col_idx {
max_col_idx = col_idx + ch_width - 1;
}
col_idx += ch_width;
}
if col_idx < self.model.columns {
self.model.model[row_idx].clear(
col_idx,
self.model.columns - 1,
&Rc::new(Highlight::new()),
);
}
}
col_idx = 0;
row_idx += 1;
}
if self.rows_filled == 1 {
self.cols_filled = max_col_idx + 1;
} else {
self.cols_filled = max(self.cols_filled, max_col_idx + 1);
}
}
fn count_lines(lines: &[Vec<(Rc<Highlight>, Vec<String>)>], max_columns: usize) -> usize {
let mut row_count = 0;
for line in lines {
let len: usize = line.iter().map(|c| c.1.len()).sum();
row_count += len / (max_columns + 1) + 1;
}
row_count
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_count_lines() {
let lines = vec![vec![(Rc::new(Highlight::new()), vec!["a".to_owned(); 5])]];
let rows = ModelLayout::count_lines(&lines, 4);
assert_eq!(2, rows);
}
#[test]
fn test_resize() {
let lines = vec![
vec![(Rc::new(Highlight::new()), vec!["a".to_owned(); 5])];
ModelLayout::ROWS_STEP
];
let mut model = ModelLayout::new(5);
model.layout(lines.clone());
let (cols, rows) = model.size();
assert_eq!(5, cols);
assert_eq!(ModelLayout::ROWS_STEP, rows);
model.layout_append(lines);
let (cols, rows) = model.size();
assert_eq!(5, cols);
assert_eq!(ModelLayout::ROWS_STEP * 2, rows);
assert_eq!(ModelLayout::ROWS_STEP * 2, model.model.rows);
}
#[test]
fn test_cols_filled() {
let lines = vec![vec![(Rc::new(Highlight::new()), vec!["a".to_owned(); 3])]; 1];
let mut model = ModelLayout::new(5);
model.layout(lines);
model.set_cursor(3);
let (cols, _) = model.size();
assert_eq!(4, cols);
let lines = vec![vec![(Rc::new(Highlight::new()), vec!["a".to_owned(); 2])]; 1];
model.layout_append(lines);
model.set_cursor(2);
let (cols, _) = model.size();
assert_eq!(3, cols);
}
#[test]
fn test_insert_shift() {
let lines = vec![vec![(Rc::new(Highlight::new()), vec!["a".to_owned(); 3])]; 1];
let mut model = ModelLayout::new(5);
model.layout(lines);
model.set_cursor(1);
model.insert_char("b".to_owned(), true, Rc::new(Highlight::new()));
let (cols, _) = model.size();
assert_eq!(4, cols);
assert_eq!("b", model.model.model()[0].line[1].ch);
}
#[test]
fn test_insert_no_shift() {
let lines = vec![vec![(Rc::new(Highlight::new()), vec!["a".to_owned(); 3])]; 1];
let mut model = ModelLayout::new(5);
model.layout(lines);
model.set_cursor(1);
model.insert_char("b".to_owned(), false, Rc::new(Highlight::new()));
let (cols, _) = model.size();
assert_eq!(3, cols);
assert_eq!("b", model.model.model()[0].line[1].ch);
}
#[test]
fn test_double_width() {
let lines = vec![vec![(Rc::new(Highlight::new()), vec!["あ".to_owned(); 3])]; 1];
let mut model = ModelLayout::new(7);
model.layout(lines);
model.set_cursor(1);
let (cols, rows) = model.size();
assert_eq!(1, rows);
assert_eq!(6, cols);
}
}