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use crate::color::Color;
use pango::{EllipsizeMode, FontDescription};
use pangocairo::{cairo, pango};
use serde::Deserialize;
use std::f64::consts::{FRAC_PI_2, PI, TAU};
use std::ops::Deref;
#[derive(Clone, Debug, PartialEq)]
pub struct RenderOptions {
pub x_offset: f64,
pub bar_height: f64,
pub fg_color: Color,
pub bg_color: Option<Color>,
pub r_left: f64,
pub r_right: f64,
pub overlap: f64,
}
#[derive(Clone, Debug, PartialEq)]
pub struct Attributes {
pub font: FontDescription,
pub padding_left: f64,
pub padding_right: f64,
pub min_width: Option<f64>,
pub align: Align,
pub markup: bool,
}
#[derive(Deserialize, Debug, Clone, Copy, PartialEq, Eq)]
#[serde(rename_all = "lowercase")]
pub enum Align {
Right,
Left,
Center,
}
impl Default for Align {
fn default() -> Self {
Self::Left
}
}
fn create_pango_layout(cairo_context: &cairo::Context) -> pango::Layout {
pangocairo::create_layout(cairo_context).unwrap()
}
fn show_pango_layout(cairo_context: &cairo::Context, layout: &pango::Layout) {
pangocairo::show_layout(cairo_context, layout);
}
#[derive(Clone, Debug, PartialEq)]
pub struct Text {
pub attr: Attributes,
pub text: String,
}
impl Text {
pub fn compute(mut self, context: &cairo::Context) -> ComputedText {
let (mut width, height) = {
let layout = create_pango_layout(context);
layout.set_font_description(Some(&self.attr.font));
if self.attr.markup {
layout.set_markup(&self.text);
} else {
layout.set_text(&self.text);
}
let (text_width, text_height) = layout.pixel_size();
let width = f64::from(text_width) + self.attr.padding_right + self.attr.padding_right;
let height = f64::from(text_height);
(width, height)
};
if let Some(min_width) = self.attr.min_width {
if width < min_width {
let d = min_width - width;
width = min_width;
match self.attr.align {
Align::Right => self.attr.padding_left += d,
Align::Left => self.attr.padding_right += d,
Align::Center => {
self.attr.padding_left += d * 0.5;
self.attr.padding_right += d * 0.5;
}
}
}
}
ComputedText {
text: self,
width,
height,
}
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct ComputedText {
pub text: Text,
pub width: f64,
pub height: f64,
}
impl Deref for ComputedText {
type Target = str;
fn deref(&self) -> &Self::Target {
&self.text.text
}
}
impl ComputedText {
pub fn render(&self, context: &cairo::Context, options: RenderOptions) {
let text = &self.text;
let layout = create_pango_layout(context);
layout.set_font_description(Some(&text.attr.font));
if text.attr.markup {
layout.set_markup(&text.text);
} else {
layout.set_text(&text.text);
}
context.save().unwrap();
context.translate(options.x_offset - options.overlap, 0.0);
// Set the width/height on the Pango layout so that it word-wraps/ellipises.
let text_width = self.width - text.attr.padding_left - text.attr.padding_right;
let text_height = self.height;
layout.set_ellipsize(EllipsizeMode::End);
layout.set_width(text_width as i32 * pango::SCALE);
layout.set_height(text_height as i32 * pango::SCALE);
// Draw background
if let Some(bg) = options.bg_color {
bg.apply(context);
rounded_rectangle(
context,
0.0,
0.0,
self.width + options.overlap,
options.bar_height,
options.r_left,
options.r_right,
);
context.fill().unwrap();
}
options.fg_color.apply(context);
context.translate(
text.attr.padding_left + options.overlap,
(options.bar_height - self.height) * 0.5,
);
show_pango_layout(context, &layout);
context.restore().unwrap();
}
}
fn rounded_rectangle(
context: &cairo::Context,
x: f64,
y: f64,
w: f64,
h: f64,
r_left: f64,
r_right: f64,
) {
if r_left > 0.0 || r_right > 0.0 {
context.new_sub_path();
context.arc(x + r_left, y + r_left, r_left, PI, 3.0 * FRAC_PI_2);
context.arc(x + w - r_right, y + r_right, r_right, 3.0 * FRAC_PI_2, TAU);
context.arc(x + w - r_right, y + h - r_right, r_right, 0.0, FRAC_PI_2);
context.arc(x + r_left, y + h - r_left, r_left, FRAC_PI_2, PI);
context.close_path();
} else {
context.rectangle(x, y, w, h);
}
}
pub fn width_of(text: &str, context: &cairo::Context, markup: bool, font: &FontDescription) -> f64 {
let text = Text {
text: text.into(),
attr: Attributes {
font: font.clone(),
padding_left: 0.0,
padding_right: 0.0,
min_width: None,
align: Default::default(),
markup,
},
};
text.compute(context).width
}
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