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//! Makes drawing on ncurses windows easier.
use std::cmp::min;
use ncurses;
use ncurses::chtype;
use theme::{ColorPair, Theme};
use vec::{Vec2, ToVec2};
/// Convenient interface to draw on a subset of the screen.
pub struct Printer {
/// Offset into the window this printer should start drawing at.
pub offset: Vec2,
/// Size of the area we are allowed to draw on.
pub size: Vec2,
/// Whether the view to draw is currently focused or not.
pub focused: bool,
/// Currently used theme
pub theme: Theme,
}
impl Printer {
/// Creates a new printer on the given window.
pub fn new<T: ToVec2>(size: T, theme: Theme) -> Self {
Printer {
offset: Vec2::zero(),
size: size.to_vec2(),
focused: true,
theme: theme,
}
}
/// Prints some text at the given position relative to the window.
pub fn print<S: ToVec2>(&self, pos: S, text: &str) {
let p = pos.to_vec2();
if p.y >= self.size.y || p.x >= self.size.x {
return;
}
// Do we have enough room for the entire line?
let room = self.size.x - p.x;
// We want the number of CHARACTERS, not bytes.
let text = match text.char_indices().nth(room) {
Some((i, _)) => &text[..i],
_ => text,
};
let p = p + self.offset;
if text.contains("%") {
ncurses::mvprintw(p.y as i32, p.x as i32, &text.replace("%", "%%"));
} else {
ncurses::mvprintw(p.y as i32, p.x as i32, text);
}
}
/// Prints a vertical line using the given character.
pub fn print_vline<T: ToVec2>(&self, start: T, len: usize, c: chtype) {
let p = start.to_vec2();
if p.y > self.size.y || p.x > self.size.x {
return;
}
let len = min(len, self.size.y - p.y);
let p = p + self.offset;
for y in 0..len {
ncurses::mvaddstr((p.y + y) as i32, p.x as i32, "│");
// ncurses::mvaddstr(p.y as i32, p.x as i32, "┌");
}
}
/// Prints a horizontal line using the given character.
pub fn print_hline<T: ToVec2>(&self, start: T, len: usize, c: chtype) {
let p = start.to_vec2();
if p.y > self.size.y || p.x > self.size.x {
return;
}
let len = min(len, self.size.x - p.x);
let p = p + self.offset;
ncurses::mvhline(p.y as i32, p.x as i32, c, len as i32);
}
/// Call the given closure with a colored printer,
/// that will apply the given color on prints.
///
/// # Examples
///
/// ```
/// # use cursive::printer::Printer;
/// # use cursive::theme;
/// # let printer = Printer::new((6,4), theme::load_default());
/// printer.with_color(theme::ColorPair::Highlight, |printer| {
/// printer.print((0,0), "This text is highlighted!");
/// });
/// ```
pub fn with_color<'a, F>(&'a self, c: ColorPair, f: F)
where F: Fn(&Printer)
{
self.with_style(ncurses::COLOR_PAIR(c.ncurses_id()), f);
ncurses::attron(ncurses::COLOR_PAIR(ColorPair::Primary.ncurses_id()));
}
/// Same as `with_color`, but apply a ncurses style instead,
/// like `ncurses::A_BOLD()` or `ncurses::A_REVERSE()`.
///
/// Will probably use a cursive enum some day.
pub fn with_style<'a, F>(&'a self, style: ncurses::attr_t, f: F)
where F: Fn(&Printer)
{
ncurses::attron(style);
f(self);
ncurses::attroff(style);
}
/// Prints a rectangular box.
///
/// # Examples
///
/// ```
/// # use cursive::printer::Printer;
/// # use cursive::theme;
/// # let printer = Printer::new((6,4), theme::load_default());
/// printer.print_box((0,0), (6,4));
/// ```
pub fn print_box<T: ToVec2>(&self, start: T, size: T) {
let start_v = start.to_vec2();
let size_v = size.to_vec2() - (1, 1);
self.print(start_v, "┌");
self.print(start_v + size_v.keep_x(), "┐");
self.print(start_v + size_v.keep_y(), "└");
self.print(start_v + size_v, "┘");
self.print_hline(start_v + (1, 0), size_v.x - 1, ncurses::ACS_HLINE());
self.print_vline(start_v + (0, 1), size_v.y - 1, ncurses::ACS_VLINE());
self.print_hline(start_v + (1, 0) + size_v.keep_y(),
size_v.x - 1,
ncurses::ACS_HLINE());
self.print_vline(start_v + (0, 1) + size_v.keep_x(),
size_v.y - 1,
ncurses::ACS_VLINE());
}
/// Returns a printer on a subset of this one's area.
pub fn sub_printer<S: ToVec2>(&self, offset: S, size: S, focused: bool) -> Printer {
let offset_v = offset.to_vec2();
Printer {
offset: self.offset + offset_v,
// We can't be larger than what remains
size: Vec2::min(self.size - offset_v, size.to_vec2()),
focused: self.focused && focused,
theme: self.theme.clone(),
}
}
}