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//! View implementation for CSV Viewer
use super::core::CsvViewer;
use super::types::SortOrder;
use crate::render::Cell;
use crate::utils::{char_width, truncate_to_width};
use crate::widget::traits::{RenderContext, View};
impl View for CsvViewer {
fn render(&self, ctx: &mut RenderContext) {
let area = ctx.area;
if area.width < 5 || area.height < 2 {
return;
}
let row_num_width = self.row_number_width();
let content_start_x = row_num_width;
let _content_width = area.width.saturating_sub(row_num_width);
// Calculate visible rows
let header_rows = if self.has_header { 1 } else { 0 };
let visible_data_rows = (area.height as usize).saturating_sub(header_rows);
// Adjust scroll to keep selection visible
let mut scroll_row = self.scroll_row;
if self.selected_row < scroll_row {
scroll_row = self.selected_row;
} else if self.selected_row >= scroll_row + visible_data_rows {
scroll_row = self.selected_row.saturating_sub(visible_data_rows - 1);
}
let mut y = 0u16;
// Render header if present
if self.has_header {
if let Some(header_row) = self.data.first() {
// Row number column header
if self.show_row_numbers {
for x in 0..content_start_x {
let mut cell = Cell::new(' ');
cell.fg = self.header_fg;
cell.bg = self.header_bg;
ctx.set(x, y, cell);
}
}
// Header cells
let mut x = content_start_x;
for (col_idx, cell_value) in header_row.iter().enumerate() {
let width = self.column_widths.get(col_idx).copied().unwrap_or(10) as usize;
// Sort indicator
let sort_indicator = if self.sort_column == Some(col_idx) {
match self.sort_order {
SortOrder::Ascending => " ▲",
SortOrder::Descending => " ▼",
SortOrder::None => "",
}
} else {
""
};
let combined = format!("{}{}", cell_value, sort_indicator);
let display = truncate_to_width(&combined, width);
let mut dx: u16 = 0;
for ch in display.chars() {
let cw = char_width(ch) as u16;
if x + dx + cw > area.width {
break;
}
let mut cell = Cell::new(ch).bold();
cell.fg = self.header_fg;
cell.bg = self.header_bg;
ctx.set(x + dx, y, cell);
dx += cw;
}
// Fill remaining width
for i in dx..(width as u16) {
if x + i >= area.width {
break;
}
let mut cell = Cell::new(' ');
cell.fg = self.header_fg;
cell.bg = self.header_bg;
ctx.set(x + i, y, cell);
}
x += width as u16;
// Separator
if self.show_separators && x < area.width {
let mut cell = Cell::new('│');
cell.fg = self.separator_fg;
cell.bg = self.header_bg;
ctx.set(x, y, cell);
x += 1;
}
}
y += 1;
}
}
// Render data rows
for &data_idx in self
.sorted_indices
.iter()
.skip(scroll_row)
.take(visible_data_rows)
{
if y >= area.height {
break;
}
let row_idx = data_idx - if self.has_header { 1 } else { 0 };
let is_selected_row = row_idx == self.selected_row;
// Row number
if self.show_row_numbers {
let num_str = format!(
"{:>width$}",
row_idx + 1,
width = (row_num_width - 1) as usize
);
let mut dx: u16 = 0;
for ch in num_str.chars() {
let cw = char_width(ch) as u16;
let mut cell = Cell::new(ch);
cell.fg = self.row_number_fg;
cell.bg = if is_selected_row {
self.selected_bg
} else {
self.bg
};
ctx.set(dx, y, cell);
dx += cw;
}
}
// Data cells
let mut x = content_start_x;
if let Some(row_data) = self.data.get(data_idx) {
for (col_idx, cell_value) in row_data.iter().enumerate() {
let width = self.column_widths.get(col_idx).copied().unwrap_or(10) as usize;
let is_selected = is_selected_row && col_idx == self.selected_col;
let is_match = self.search_matches.contains(&(row_idx, col_idx));
let (fg, bg) = if is_selected {
(self.selected_fg, self.selected_bg)
} else if is_match {
(self.match_fg, self.match_bg)
} else {
(self.fg, self.bg)
};
let display = truncate_to_width(cell_value, width);
let mut dx: u16 = 0;
for ch in display.chars() {
let cw = char_width(ch) as u16;
if x + dx + cw > area.width {
break;
}
let mut cell = Cell::new(ch);
cell.fg = fg;
cell.bg = bg;
ctx.set(x + dx, y, cell);
dx += cw;
}
// Fill remaining width
for i in dx..(width as u16) {
if x + i >= area.width {
break;
}
let mut cell = Cell::new(' ');
cell.fg = fg;
cell.bg = bg;
ctx.set(x + i, y, cell);
}
x += width as u16;
// Separator
if self.show_separators && x < area.width {
let mut cell = Cell::new('│');
cell.fg = self.separator_fg;
cell.bg = if is_selected_row {
self.selected_bg
} else {
self.bg
};
ctx.set(x, y, cell);
x += 1;
}
}
}
y += 1;
}
}
crate::impl_view_meta!("CsvViewer");
}