122 lines
3.4 KiB
Rust
122 lines
3.4 KiB
Rust
use pangocairo::FontMap;
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use pango::prelude::*;
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use pango;
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use sys::pango as sys_pango;
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use sys::pango::AttrIteratorFactory;
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use ui_model::StyledLine;
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use super::itemize::ItemizeIterator;
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pub struct Context {
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state: ContextState,
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}
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impl Context {
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pub fn new(font_desc: pango::FontDescription) -> Self {
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Context {
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state: ContextState::new(font_desc),
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}
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}
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pub fn update(&mut self, font_desc: pango::FontDescription) {
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self.state = ContextState::new(font_desc);
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}
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pub fn itemize(&self, line: &StyledLine) -> Vec<sys_pango::Item> {
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let mut attr_iter = line.attr_list.get_iterator();
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ItemizeIterator::new(&line.line_str)
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.flat_map(|(offset, len)| {
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sys_pango::pango_itemize(
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&self.state.pango_context,
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&line.line_str,
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offset,
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len,
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&line.attr_list,
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Some(&mut attr_iter),
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)
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})
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.collect()
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}
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pub fn create_layout(&self) -> pango::Layout {
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pango::Layout::new(&self.state.pango_context)
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}
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#[inline]
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pub fn font_description(&self) -> &pango::FontDescription {
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&self.state.font_desc
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}
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#[inline]
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pub fn cell_metrics(&self) -> &CellMetrics {
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&self.state.cell_metrics
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}
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}
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struct ContextState {
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pango_context: pango::Context,
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cell_metrics: CellMetrics,
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font_desc: pango::FontDescription,
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}
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impl ContextState {
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pub fn new(font_desc: pango::FontDescription) -> Self {
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let font_map = FontMap::get_default().unwrap();
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let pango_context = font_map.create_context().unwrap();
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pango_context.set_font_description(&font_desc);
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let font_metrics = pango_context.get_metrics(None, None).unwrap();
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ContextState {
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pango_context,
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cell_metrics: CellMetrics::new(&font_metrics),
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font_desc,
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}
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}
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}
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pub struct CellMetrics {
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pub line_height: f64,
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pub char_width: f64,
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pub ascent: f64,
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pub underline_position: f64,
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pub underline_thickness: f64,
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pub pango_ascent: i32,
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pub pango_descent: i32,
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pub pango_char_width: i32,
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}
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impl CellMetrics {
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fn new(font_metrics: &pango::FontMetrics) -> Self {
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CellMetrics {
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pango_ascent: font_metrics.get_ascent(),
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pango_descent: font_metrics.get_descent(),
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pango_char_width: font_metrics.get_approximate_digit_width(),
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ascent: font_metrics.get_ascent() as f64 / pango::SCALE as f64,
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line_height: (font_metrics.get_ascent() + font_metrics.get_descent()) as f64
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/ pango::SCALE as f64,
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char_width: font_metrics.get_approximate_digit_width() as f64 / pango::SCALE as f64,
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underline_position: (font_metrics.get_ascent() - font_metrics.get_underline_position())
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as f64 / pango::SCALE as f64,
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underline_thickness: font_metrics.get_underline_thickness() as f64
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/ pango::SCALE as f64,
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}
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}
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#[cfg(test)]
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pub fn new_hw(line_height: f64, char_width: f64) -> Self {
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CellMetrics {
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pango_ascent: 0,
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pango_descent: 0,
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pango_char_width: 0,
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ascent: 0.0,
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line_height,
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char_width,
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underline_position: 0.0,
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underline_thickness: 0.0,
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}
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}
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}
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