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use super::*;
pub trait IndexContent: Component {
/* Handles the drawing of one entry */
fn make_entry(&mut self, idx: usize) -> ();
/* Handles what happens when the user selects an entry in the index listing */
fn enter_entry(&mut self, grid: &mut CellBuffer, area: Area, context: &mut Context) -> ();
/* Refreshes content */
fn refresh(&mut self, context: &mut Context) -> ();
fn search(&self, term: &str) -> Option<usize>;
}
#[derive(Debug, PartialEq)]
enum IndexState {
//Uninitialized,
Listing,
Unfocused,
//Search,
}
#[derive(Debug)]
pub struct Index {
cursor_pos: usize,
new_cursor_pos: usize,
length: usize,
/// Cache current view.
canvas: CellBuffer,
/// If we must redraw on next redraw event
dirty: bool,
state: IndexState,
content: Box<IndexContent>,
}
impl Index {
fn highlight_line(&self, grid: &mut CellBuffer, area: Area, idx: usize) {
let fg_color = Color::Default;
let bg_color = if self.cursor_pos == idx {
Color::Byte(246)
/* } else if idx % 2 == 0 {
Color::Byte(236)*/
} else {
Color::Default
};
change_colors(grid, area, fg_color, bg_color);
}
}
impl Component for Index {
fn draw(&mut self, grid: &mut CellBuffer, area: Area, context: &mut Context) {
if !self.dirty {
return;
}
match self.state {
IndexState::Listing => {
/* rehighlight entries, redraw pages */
let upper_left = upper_left!(area);
let bottom_right = bottom_right!(area);
let rows = get_y(bottom_right) - get_y(upper_left) + 1;
let prev_page_no = (self.cursor_pos).wrapping_div(rows);
let page_no = (self.new_cursor_pos).wrapping_div(rows);
let top_idx = page_no * rows;
if self.new_cursor_pos >= self.length {
self.new_cursor_pos = self.length - 1;
}
/* If cursor position has changed, remove the highlight from the previous position and
* apply it in the new one. */
if self.cursor_pos != self.new_cursor_pos && prev_page_no == page_no {
let old_cursor_pos = self.cursor_pos;
self.cursor_pos = self.new_cursor_pos;
for idx in &[old_cursor_pos, self.new_cursor_pos] {
if *idx >= self.length {
continue; //bounds check
}
let new_area = (
set_y(upper_left, get_y(upper_left) + (*idx % rows)),
set_y(bottom_right, get_y(upper_left) + (*idx % rows)),
);
self.highlight_line(grid, new_area, *idx);
context.dirty_areas.push_back(new_area);
}
return;
} else if self.cursor_pos != self.new_cursor_pos {
self.cursor_pos = self.new_cursor_pos;
}
/* Page_no has changed, so draw new page */
copy_area(
grid,
&self.canvas,
area,
((0, top_idx), (500 - 1, self.length)),
);
self.highlight_line(
grid,
(
(
get_x(upper_left),
get_y(upper_left) + (self.cursor_pos % rows),
),
(
get_x(bottom_right),
get_y(upper_left) + (self.cursor_pos % rows),
),
),
self.cursor_pos,
);
context.dirty_areas.push_back(area);
}
IndexState::Unfocused => {
self.content.draw(grid, area, context);
}
//IndexState::Search => unreachable!(),
}
self.dirty = false;
return;
}
fn process_event(&mut self, event: &mut UIEvent, context: &mut Context) -> bool {
if self.content.process_event(event, context) {
return true;
}
match event.event_type {
UIEventType::Input(Key::Up) => {
if self.cursor_pos > 0 {
self.new_cursor_pos = self.new_cursor_pos.saturating_sub(1);
self.set_dirty();
}
return true;
}
UIEventType::Input(Key::Down) => {
if self.length > 0 && self.new_cursor_pos < self.length - 1 {
self.new_cursor_pos += 1;
self.set_dirty();
}
return true;
}
UIEventType::Input(Key::Char('\n')) if self.state == IndexState::Listing => {
self.state = IndexState::Unfocused;
self.set_dirty();
return true;
}
UIEventType::Input(Key::Char('i')) if self.state == IndexState::Unfocused => {
self.state = IndexState::Listing;
self.set_dirty();
return true;
}
UIEventType::ChangeMode(UIMode::Normal) => {
self.set_dirty();
}
UIEventType::Resize => {
self.set_dirty();
}
_ => {}
}
false
}
fn is_dirty(&self) -> bool {
self.dirty || self.content.is_dirty()
}
fn set_dirty(&mut self) {
self.dirty = true;
}
}
impl fmt::Display for Index {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
Display::fmt(&self.content, f)
}
}