mirror of https://github.com/helix-editor/helix
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
616 lines
19 KiB
Rust
616 lines
19 KiB
Rust
use bitflags::bitflags;
|
|
use std::{
|
|
cmp::{max, min},
|
|
str::FromStr,
|
|
};
|
|
|
|
#[derive(Debug, Clone, Copy, PartialEq)]
|
|
/// UNSTABLE
|
|
pub enum CursorKind {
|
|
/// █
|
|
Block,
|
|
/// |
|
|
Bar,
|
|
/// _
|
|
Underline,
|
|
/// Hidden cursor, can set cursor position with this to let IME have correct cursor position.
|
|
Hidden,
|
|
}
|
|
|
|
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
|
|
pub struct Margin {
|
|
pub vertical: u16,
|
|
pub horizontal: u16,
|
|
}
|
|
|
|
/// A simple rectangle used in the computation of the layout and to give widgets an hint about the
|
|
/// area they are supposed to render to. (x, y) = (0, 0) is at the top left corner of the screen.
|
|
#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
|
|
pub struct Rect {
|
|
pub x: u16,
|
|
pub y: u16,
|
|
pub width: u16,
|
|
pub height: u16,
|
|
}
|
|
|
|
impl Default for Rect {
|
|
fn default() -> Rect {
|
|
Rect {
|
|
x: 0,
|
|
y: 0,
|
|
width: 0,
|
|
height: 0,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Rect {
|
|
/// Creates a new rect, with width and height limited to keep the area under max u16.
|
|
/// If clipped, aspect ratio will be preserved.
|
|
pub fn new(x: u16, y: u16, width: u16, height: u16) -> Rect {
|
|
let max_area = u16::max_value();
|
|
let (clipped_width, clipped_height) =
|
|
if u32::from(width) * u32::from(height) > u32::from(max_area) {
|
|
let aspect_ratio = f64::from(width) / f64::from(height);
|
|
let max_area_f = f64::from(max_area);
|
|
let height_f = (max_area_f / aspect_ratio).sqrt();
|
|
let width_f = height_f * aspect_ratio;
|
|
(width_f as u16, height_f as u16)
|
|
} else {
|
|
(width, height)
|
|
};
|
|
Rect {
|
|
x,
|
|
y,
|
|
width: clipped_width,
|
|
height: clipped_height,
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn area(self) -> u16 {
|
|
self.width * self.height
|
|
}
|
|
|
|
#[inline]
|
|
pub fn left(self) -> u16 {
|
|
self.x
|
|
}
|
|
|
|
#[inline]
|
|
pub fn right(self) -> u16 {
|
|
self.x.saturating_add(self.width)
|
|
}
|
|
|
|
#[inline]
|
|
pub fn top(self) -> u16 {
|
|
self.y
|
|
}
|
|
|
|
#[inline]
|
|
pub fn bottom(self) -> u16 {
|
|
self.y.saturating_add(self.height)
|
|
}
|
|
|
|
// Returns a new Rect with width reduced from the left side.
|
|
// This changes the `x` coordinate and clamps it to the right
|
|
// edge of the original Rect.
|
|
pub fn clip_left(self, width: u16) -> Rect {
|
|
let width = std::cmp::min(width, self.width);
|
|
Rect {
|
|
x: self.x.saturating_add(width),
|
|
width: self.width.saturating_sub(width),
|
|
..self
|
|
}
|
|
}
|
|
|
|
// Returns a new Rect with width reduced from the right side.
|
|
// This does _not_ change the `x` coordinate.
|
|
pub fn clip_right(self, width: u16) -> Rect {
|
|
Rect {
|
|
width: self.width.saturating_sub(width),
|
|
..self
|
|
}
|
|
}
|
|
|
|
// Returns a new Rect with height reduced from the top.
|
|
// This changes the `y` coordinate and clamps it to the bottom
|
|
// edge of the original Rect.
|
|
pub fn clip_top(self, height: u16) -> Rect {
|
|
let height = std::cmp::min(height, self.height);
|
|
Rect {
|
|
y: self.y.saturating_add(height),
|
|
height: self.height.saturating_sub(height),
|
|
..self
|
|
}
|
|
}
|
|
|
|
// Returns a new Rect with height reduced from the bottom.
|
|
// This does _not_ change the `y` coordinate.
|
|
pub fn clip_bottom(self, height: u16) -> Rect {
|
|
Rect {
|
|
height: self.height.saturating_sub(height),
|
|
..self
|
|
}
|
|
}
|
|
|
|
pub fn with_height(self, height: u16) -> Rect {
|
|
// new height may make area > u16::max_value, so use new()
|
|
Self::new(self.x, self.y, self.width, height)
|
|
}
|
|
|
|
pub fn with_width(self, width: u16) -> Rect {
|
|
Self::new(self.x, self.y, width, self.height)
|
|
}
|
|
|
|
pub fn inner(self, margin: &Margin) -> Rect {
|
|
if self.width < 2 * margin.horizontal || self.height < 2 * margin.vertical {
|
|
Rect::default()
|
|
} else {
|
|
Rect {
|
|
x: self.x + margin.horizontal,
|
|
y: self.y + margin.vertical,
|
|
width: self.width - 2 * margin.horizontal,
|
|
height: self.height - 2 * margin.vertical,
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Calculate the union between two [`Rect`]s.
|
|
pub fn union(self, other: Rect) -> Rect {
|
|
// Example:
|
|
//
|
|
// If `Rect` A is positioned at `(0, 0)` with a width and height of `5`,
|
|
// and `Rect` B is positioned at `(5, 0)` with a width and height of `2`,
|
|
// then this is the resulting union:
|
|
//
|
|
// x1 = min(0, 5) => x1 = 0
|
|
// y1 = min(0, 0) => y1 = 0
|
|
// x2 = max(0 + 5, 5 + 2) => x2 = 7
|
|
// y2 = max(0 + 5, 0 + 2) => y2 = 5
|
|
let x1 = min(self.x, other.x);
|
|
let y1 = min(self.y, other.y);
|
|
let x2 = max(self.x + self.width, other.x + other.width);
|
|
let y2 = max(self.y + self.height, other.y + other.height);
|
|
Rect {
|
|
x: x1,
|
|
y: y1,
|
|
width: x2 - x1,
|
|
height: y2 - y1,
|
|
}
|
|
}
|
|
|
|
/// Calculate the intersection between two [`Rect`]s.
|
|
pub fn intersection(self, other: Rect) -> Rect {
|
|
// Example:
|
|
//
|
|
// If `Rect` A is positioned at `(0, 0)` with a width and height of `5`,
|
|
// and `Rect` B is positioned at `(5, 0)` with a width and height of `2`,
|
|
// then this is the resulting intersection:
|
|
//
|
|
// x1 = max(0, 5) => x1 = 5
|
|
// y1 = max(0, 0) => y1 = 0
|
|
// x2 = min(0 + 5, 5 + 2) => x2 = 5
|
|
// y2 = min(0 + 5, 0 + 2) => y2 = 2
|
|
let x1 = max(self.x, other.x);
|
|
let y1 = max(self.y, other.y);
|
|
let x2 = min(self.x + self.width, other.x + other.width);
|
|
let y2 = min(self.y + self.height, other.y + other.height);
|
|
Rect {
|
|
x: x1,
|
|
y: y1,
|
|
width: x2 - x1,
|
|
height: y2 - y1,
|
|
}
|
|
}
|
|
|
|
pub fn intersects(self, other: Rect) -> bool {
|
|
self.x < other.x + other.width
|
|
&& self.x + self.width > other.x
|
|
&& self.y < other.y + other.height
|
|
&& self.y + self.height > other.y
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Clone, Copy, PartialEq)]
|
|
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
|
|
pub enum Color {
|
|
Reset,
|
|
Black,
|
|
Red,
|
|
Green,
|
|
Yellow,
|
|
Blue,
|
|
Magenta,
|
|
Cyan,
|
|
Gray,
|
|
LightRed,
|
|
LightGreen,
|
|
LightYellow,
|
|
LightBlue,
|
|
LightMagenta,
|
|
LightCyan,
|
|
LightGray,
|
|
White,
|
|
Rgb(u8, u8, u8),
|
|
Indexed(u8),
|
|
}
|
|
|
|
#[cfg(feature = "term")]
|
|
impl From<Color> for crossterm::style::Color {
|
|
fn from(color: Color) -> Self {
|
|
use crossterm::style::Color as CColor;
|
|
|
|
match color {
|
|
Color::Reset => CColor::Reset,
|
|
Color::Black => CColor::Black,
|
|
Color::Red => CColor::DarkRed,
|
|
Color::Green => CColor::DarkGreen,
|
|
Color::Yellow => CColor::DarkYellow,
|
|
Color::Blue => CColor::DarkBlue,
|
|
Color::Magenta => CColor::DarkMagenta,
|
|
Color::Cyan => CColor::DarkCyan,
|
|
Color::Gray => CColor::DarkGrey,
|
|
Color::LightRed => CColor::Red,
|
|
Color::LightGreen => CColor::Green,
|
|
Color::LightBlue => CColor::Blue,
|
|
Color::LightYellow => CColor::Yellow,
|
|
Color::LightMagenta => CColor::Magenta,
|
|
Color::LightCyan => CColor::Cyan,
|
|
Color::LightGray => CColor::Grey,
|
|
Color::White => CColor::White,
|
|
Color::Indexed(i) => CColor::AnsiValue(i),
|
|
Color::Rgb(r, g, b) => CColor::Rgb { r, g, b },
|
|
}
|
|
}
|
|
}
|
|
|
|
bitflags! {
|
|
/// Modifier changes the way a piece of text is displayed.
|
|
///
|
|
/// They are bitflags so they can easily be composed.
|
|
///
|
|
/// ## Examples
|
|
///
|
|
/// ```rust
|
|
/// # use helix_view::graphics::Modifier;
|
|
///
|
|
/// let m = Modifier::BOLD | Modifier::ITALIC;
|
|
/// ```
|
|
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
|
|
pub struct Modifier: u16 {
|
|
const BOLD = 0b0000_0000_0001;
|
|
const DIM = 0b0000_0000_0010;
|
|
const ITALIC = 0b0000_0000_0100;
|
|
const UNDERLINED = 0b0000_0000_1000;
|
|
const SLOW_BLINK = 0b0000_0001_0000;
|
|
const RAPID_BLINK = 0b0000_0010_0000;
|
|
const REVERSED = 0b0000_0100_0000;
|
|
const HIDDEN = 0b0000_1000_0000;
|
|
const CROSSED_OUT = 0b0001_0000_0000;
|
|
}
|
|
}
|
|
|
|
impl FromStr for Modifier {
|
|
type Err = &'static str;
|
|
|
|
fn from_str(modifier: &str) -> Result<Self, Self::Err> {
|
|
match modifier {
|
|
"bold" => Ok(Self::BOLD),
|
|
"dim" => Ok(Self::DIM),
|
|
"italic" => Ok(Self::ITALIC),
|
|
"underlined" => Ok(Self::UNDERLINED),
|
|
"slow_blink" => Ok(Self::SLOW_BLINK),
|
|
"rapid_blink" => Ok(Self::RAPID_BLINK),
|
|
"reversed" => Ok(Self::REVERSED),
|
|
"hidden" => Ok(Self::HIDDEN),
|
|
"crossed_out" => Ok(Self::CROSSED_OUT),
|
|
_ => Err("Invalid modifier"),
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Style let you control the main characteristics of the displayed elements.
|
|
///
|
|
/// ```rust
|
|
/// # use helix_view::graphics::{Color, Modifier, Style};
|
|
/// Style::default()
|
|
/// .fg(Color::Black)
|
|
/// .bg(Color::Green)
|
|
/// .add_modifier(Modifier::ITALIC | Modifier::BOLD);
|
|
/// ```
|
|
///
|
|
/// It represents an incremental change. If you apply the styles S1, S2, S3 to a cell of the
|
|
/// terminal buffer, the style of this cell will be the result of the merge of S1, S2 and S3, not
|
|
/// just S3.
|
|
///
|
|
/// ```rust
|
|
/// # use helix_view::graphics::{Rect, Color, Modifier, Style};
|
|
/// # use helix_tui::buffer::Buffer;
|
|
/// let styles = [
|
|
/// Style::default().fg(Color::Blue).add_modifier(Modifier::BOLD | Modifier::ITALIC),
|
|
/// Style::default().bg(Color::Red),
|
|
/// Style::default().fg(Color::Yellow).remove_modifier(Modifier::ITALIC),
|
|
/// ];
|
|
/// let mut buffer = Buffer::empty(Rect::new(0, 0, 1, 1));
|
|
/// for style in &styles {
|
|
/// buffer.get_mut(0, 0).set_style(*style);
|
|
/// }
|
|
/// assert_eq!(
|
|
/// Style {
|
|
/// fg: Some(Color::Yellow),
|
|
/// bg: Some(Color::Red),
|
|
/// add_modifier: Modifier::BOLD,
|
|
/// sub_modifier: Modifier::empty(),
|
|
/// },
|
|
/// buffer.get(0, 0).style(),
|
|
/// );
|
|
/// ```
|
|
///
|
|
/// The default implementation returns a `Style` that does not modify anything. If you wish to
|
|
/// reset all properties until that point use [`Style::reset`].
|
|
///
|
|
/// ```
|
|
/// # use helix_view::graphics::{Rect, Color, Modifier, Style};
|
|
/// # use helix_tui::buffer::Buffer;
|
|
/// let styles = [
|
|
/// Style::default().fg(Color::Blue).add_modifier(Modifier::BOLD | Modifier::ITALIC),
|
|
/// Style::reset().fg(Color::Yellow),
|
|
/// ];
|
|
/// let mut buffer = Buffer::empty(Rect::new(0, 0, 1, 1));
|
|
/// for style in &styles {
|
|
/// buffer.get_mut(0, 0).set_style(*style);
|
|
/// }
|
|
/// assert_eq!(
|
|
/// Style {
|
|
/// fg: Some(Color::Yellow),
|
|
/// bg: Some(Color::Reset),
|
|
/// add_modifier: Modifier::empty(),
|
|
/// sub_modifier: Modifier::empty(),
|
|
/// },
|
|
/// buffer.get(0, 0).style(),
|
|
/// );
|
|
/// ```
|
|
#[derive(Debug, Clone, Copy, PartialEq)]
|
|
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
|
|
pub struct Style {
|
|
pub fg: Option<Color>,
|
|
pub bg: Option<Color>,
|
|
pub add_modifier: Modifier,
|
|
pub sub_modifier: Modifier,
|
|
}
|
|
|
|
impl Default for Style {
|
|
fn default() -> Style {
|
|
Style {
|
|
fg: None,
|
|
bg: None,
|
|
add_modifier: Modifier::empty(),
|
|
sub_modifier: Modifier::empty(),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Style {
|
|
/// Returns a `Style` resetting all properties.
|
|
pub fn reset() -> Style {
|
|
Style {
|
|
fg: Some(Color::Reset),
|
|
bg: Some(Color::Reset),
|
|
add_modifier: Modifier::empty(),
|
|
sub_modifier: Modifier::all(),
|
|
}
|
|
}
|
|
|
|
/// Changes the foreground color.
|
|
///
|
|
/// ## Examples
|
|
///
|
|
/// ```rust
|
|
/// # use helix_view::graphics::{Color, Style};
|
|
/// let style = Style::default().fg(Color::Blue);
|
|
/// let diff = Style::default().fg(Color::Red);
|
|
/// assert_eq!(style.patch(diff), Style::default().fg(Color::Red));
|
|
/// ```
|
|
pub fn fg(mut self, color: Color) -> Style {
|
|
self.fg = Some(color);
|
|
self
|
|
}
|
|
|
|
/// Changes the background color.
|
|
///
|
|
/// ## Examples
|
|
///
|
|
/// ```rust
|
|
/// # use helix_view::graphics::{Color, Style};
|
|
/// let style = Style::default().bg(Color::Blue);
|
|
/// let diff = Style::default().bg(Color::Red);
|
|
/// assert_eq!(style.patch(diff), Style::default().bg(Color::Red));
|
|
/// ```
|
|
pub fn bg(mut self, color: Color) -> Style {
|
|
self.bg = Some(color);
|
|
self
|
|
}
|
|
|
|
/// Changes the text emphasis.
|
|
///
|
|
/// When applied, it adds the given modifier to the `Style` modifiers.
|
|
///
|
|
/// ## Examples
|
|
///
|
|
/// ```rust
|
|
/// # use helix_view::graphics::{Color, Modifier, Style};
|
|
/// let style = Style::default().add_modifier(Modifier::BOLD);
|
|
/// let diff = Style::default().add_modifier(Modifier::ITALIC);
|
|
/// let patched = style.patch(diff);
|
|
/// assert_eq!(patched.add_modifier, Modifier::BOLD | Modifier::ITALIC);
|
|
/// assert_eq!(patched.sub_modifier, Modifier::empty());
|
|
/// ```
|
|
pub fn add_modifier(mut self, modifier: Modifier) -> Style {
|
|
self.sub_modifier.remove(modifier);
|
|
self.add_modifier.insert(modifier);
|
|
self
|
|
}
|
|
|
|
/// Changes the text emphasis.
|
|
///
|
|
/// When applied, it removes the given modifier from the `Style` modifiers.
|
|
///
|
|
/// ## Examples
|
|
///
|
|
/// ```rust
|
|
/// # use helix_view::graphics::{Color, Modifier, Style};
|
|
/// let style = Style::default().add_modifier(Modifier::BOLD | Modifier::ITALIC);
|
|
/// let diff = Style::default().remove_modifier(Modifier::ITALIC);
|
|
/// let patched = style.patch(diff);
|
|
/// assert_eq!(patched.add_modifier, Modifier::BOLD);
|
|
/// assert_eq!(patched.sub_modifier, Modifier::ITALIC);
|
|
/// ```
|
|
pub fn remove_modifier(mut self, modifier: Modifier) -> Style {
|
|
self.add_modifier.remove(modifier);
|
|
self.sub_modifier.insert(modifier);
|
|
self
|
|
}
|
|
|
|
/// Results in a combined style that is equivalent to applying the two individual styles to
|
|
/// a style one after the other.
|
|
///
|
|
/// ## Examples
|
|
/// ```
|
|
/// # use helix_view::graphics::{Color, Modifier, Style};
|
|
/// let style_1 = Style::default().fg(Color::Yellow);
|
|
/// let style_2 = Style::default().bg(Color::Red);
|
|
/// let combined = style_1.patch(style_2);
|
|
/// assert_eq!(
|
|
/// Style::default().patch(style_1).patch(style_2),
|
|
/// Style::default().patch(combined));
|
|
/// ```
|
|
pub fn patch(mut self, other: Style) -> Style {
|
|
self.fg = other.fg.or(self.fg);
|
|
self.bg = other.bg.or(self.bg);
|
|
|
|
self.add_modifier.remove(other.sub_modifier);
|
|
self.add_modifier.insert(other.add_modifier);
|
|
self.sub_modifier.remove(other.add_modifier);
|
|
self.sub_modifier.insert(other.sub_modifier);
|
|
|
|
self
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_rect_size_truncation() {
|
|
for width in 256u16..300u16 {
|
|
for height in 256u16..300u16 {
|
|
let rect = Rect::new(0, 0, width, height);
|
|
rect.area(); // Should not panic.
|
|
assert!(rect.width < width || rect.height < height);
|
|
// The target dimensions are rounded down so the math will not be too precise
|
|
// but let's make sure the ratios don't diverge crazily.
|
|
assert!(
|
|
(f64::from(rect.width) / f64::from(rect.height)
|
|
- f64::from(width) / f64::from(height))
|
|
.abs()
|
|
< 1.0
|
|
)
|
|
}
|
|
}
|
|
|
|
// One dimension below 255, one above. Area above max u16.
|
|
let width = 900;
|
|
let height = 100;
|
|
let rect = Rect::new(0, 0, width, height);
|
|
assert_ne!(rect.width, 900);
|
|
assert_ne!(rect.height, 100);
|
|
assert!(rect.width < width || rect.height < height);
|
|
}
|
|
|
|
#[test]
|
|
fn test_rect_size_preservation() {
|
|
for width in 0..256u16 {
|
|
for height in 0..256u16 {
|
|
let rect = Rect::new(0, 0, width, height);
|
|
rect.area(); // Should not panic.
|
|
assert_eq!(rect.width, width);
|
|
assert_eq!(rect.height, height);
|
|
}
|
|
}
|
|
|
|
// One dimension below 255, one above. Area below max u16.
|
|
let rect = Rect::new(0, 0, 300, 100);
|
|
assert_eq!(rect.width, 300);
|
|
assert_eq!(rect.height, 100);
|
|
}
|
|
|
|
#[test]
|
|
fn test_rect_chop_from_left() {
|
|
let rect = Rect::new(0, 0, 20, 30);
|
|
assert_eq!(Rect::new(10, 0, 10, 30), rect.clip_left(10));
|
|
assert_eq!(
|
|
Rect::new(20, 0, 0, 30),
|
|
rect.clip_left(40),
|
|
"x should be clamped to original width if new width is bigger"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_rect_chop_from_right() {
|
|
let rect = Rect::new(0, 0, 20, 30);
|
|
assert_eq!(Rect::new(0, 0, 10, 30), rect.clip_right(10));
|
|
}
|
|
|
|
#[test]
|
|
fn test_rect_chop_from_top() {
|
|
let rect = Rect::new(0, 0, 20, 30);
|
|
assert_eq!(Rect::new(0, 10, 20, 20), rect.clip_top(10));
|
|
assert_eq!(
|
|
Rect::new(0, 30, 20, 0),
|
|
rect.clip_top(50),
|
|
"y should be clamped to original height if new height is bigger"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_rect_chop_from_bottom() {
|
|
let rect = Rect::new(0, 0, 20, 30);
|
|
assert_eq!(Rect::new(0, 0, 20, 20), rect.clip_bottom(10));
|
|
}
|
|
|
|
fn styles() -> Vec<Style> {
|
|
vec![
|
|
Style::default(),
|
|
Style::default().fg(Color::Yellow),
|
|
Style::default().bg(Color::Yellow),
|
|
Style::default().add_modifier(Modifier::BOLD),
|
|
Style::default().remove_modifier(Modifier::BOLD),
|
|
Style::default().add_modifier(Modifier::ITALIC),
|
|
Style::default().remove_modifier(Modifier::ITALIC),
|
|
Style::default().add_modifier(Modifier::ITALIC | Modifier::BOLD),
|
|
Style::default().remove_modifier(Modifier::ITALIC | Modifier::BOLD),
|
|
]
|
|
}
|
|
|
|
#[test]
|
|
fn combined_patch_gives_same_result_as_individual_patch() {
|
|
let styles = styles();
|
|
for &a in &styles {
|
|
for &b in &styles {
|
|
for &c in &styles {
|
|
for &d in &styles {
|
|
let combined = a.patch(b.patch(c.patch(d)));
|
|
|
|
assert_eq!(
|
|
Style::default().patch(a).patch(b).patch(c).patch(d),
|
|
Style::default().patch(combined)
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|