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//! Painting for `MarkdownView`.
//!
//! All drawing in this module uses the already laid-out Y-up row positions
//! produced by `layout.rs`.
use std::sync::Arc;
use crate::color::Color;
use crate::draw_ctx::DrawCtx;
use crate::text::measure_text_metrics;
use super::{
image_loader, is_rect_visible_in_root, scrollbar_rect, scrollbar_thumb, ImageState, LayoutItem,
LineRun, LineStyle, MarkdownView, BLOCK_SCROLLBAR_GAP, BLOCK_SCROLLBAR_H,
};
impl MarkdownView {
pub(super) fn paint_markdown(&mut self, ctx: &mut dyn DrawCtx) {
let v = ctx.visuals();
let pad = self.padding;
let w = self.bounds.width;
let font = self.active_font();
ctx.set_font(Arc::clone(&font));
self.paint_selection(ctx);
for item in &self.items {
match item {
LayoutItem::Line {
runs,
style,
indent,
quote,
y,
height,
} => {
let fs = style.font_size(self.font_size);
ctx.set_font_size(fs);
let tx = pad + indent;
let ty = y + height * 0.5;
let metrics = measure_text_metrics(&font, "", fs);
let text_y = ty - (metrics.ascent - metrics.descent) * 0.5;
if *quote {
ctx.set_fill_color(v.separator);
ctx.begin_path();
ctx.rect(pad + indent - 12.0, *y, 3.0, *height);
ctx.fill();
}
match style {
LineStyle::Rule => {
ctx.set_fill_color(v.separator);
ctx.begin_path();
ctx.rect(pad, ty, w - pad * 2.0, 1.0);
ctx.fill();
}
LineStyle::Code => {
ctx.set_fill_color(Color::rgba(0.0, 0.0, 0.0, 0.15));
ctx.begin_path();
ctx.rounded_rect(pad, *y, w - pad * 2.0, *height, 3.0);
ctx.fill();
ctx.set_fill_color(v.accent);
for run in runs {
if let LineRun::Text { text, x, .. } = run {
ctx.fill_text(text, tx + x + 4.0, text_y);
}
}
}
_ => {
ctx.set_fill_color(v.text_color);
for run in runs {
match run {
LineRun::Text {
text,
link,
code,
x,
width,
} => {
if *code {
ctx.set_fill_color(Color::rgba(0.5, 0.5, 0.5, 0.14));
ctx.begin_path();
ctx.rounded_rect(
tx + x,
*y + height * 0.16,
*width,
height * 0.68,
3.0,
);
ctx.fill();
}
ctx.set_fill_color(if link.is_some() {
v.accent
} else if *code {
v.text_color
} else {
v.text_color
});
let text_x = if *code {
tx + x + self.font_size * 0.35
} else {
tx + x
};
ctx.fill_text(text, text_x, text_y);
if link.is_some() {
ctx.begin_path();
ctx.rect(tx + x, text_y - 2.0, *width, 1.0);
ctx.fill();
}
}
LineRun::Image {
url: _,
alt,
link: _,
cache_idx,
x,
y_offset,
width,
height,
} => {
let rx = tx + x;
let ry = y + y_offset;
if let Some(entry) = self.image_cache.get(*cache_idx) {
if is_rect_visible_in_root(ctx, rx, ry, *width, *height)
{
let should_load = if let Ok(mut state) =
entry.state.lock()
{
if matches!(*state, ImageState::RemotePending) {
*state = ImageState::Loading;
true
} else {
false
}
} else {
false
};
if should_load {
image_loader::load_remote_image(
entry.url.clone(),
std::sync::Arc::clone(&entry.state),
);
}
}
let ready =
entry.state.lock().ok().and_then(|mut state| {
match &mut *state {
ImageState::Ready { image, seen } => {
*seen = true;
Some(image.clone())
}
_ => None,
}
});
if let Some(image) = ready {
ctx.draw_image_rgba(
image.data.as_slice(),
image.width,
image.height,
rx,
ry,
*width,
*height,
);
} else {
ctx.set_fill_color(Color::rgba(
0.5, 0.5, 0.5, 0.15,
));
ctx.begin_path();
ctx.rounded_rect(rx, ry, *width, *height, 3.0);
ctx.fill();
ctx.set_fill_color(v.text_dim);
ctx.set_font_size(self.font_size * 0.85);
let label = if alt.is_empty() {
"image".to_string()
} else {
alt.clone()
};
ctx.fill_text(&label, rx + 8.0, ry + height * 0.5);
ctx.set_font_size(fs);
ctx.set_fill_color(v.text_color);
}
}
}
}
}
}
}
if matches!(style, LineStyle::H1 | LineStyle::H2) && !runs.is_empty() {
ctx.set_fill_color(v.separator);
ctx.begin_path();
ctx.rect(pad, *y, w - pad * 2.0, 1.0);
ctx.fill();
}
}
LayoutItem::Table {
block_idx,
rows,
y,
height: _,
row_h,
col_widths,
viewport_width,
content_width,
} => {
let table_w: f64 = col_widths.iter().sum();
let scroll_x = self.block_scroll_offset(*block_idx);
let scrollbar_h = if content_width > viewport_width {
BLOCK_SCROLLBAR_H + BLOCK_SCROLLBAR_GAP
} else {
0.0
};
let content_y = y + scrollbar_h;
ctx.save();
ctx.clip_rect(pad, content_y, *viewport_width, row_h * rows.len() as f64);
ctx.translate(-scroll_x, 0.0);
let mut cy = content_y + row_h * rows.len() as f64;
ctx.set_font_size(self.font_size);
for (ri, row) in rows.iter().enumerate() {
cy -= row_h;
if ri == 0 {
ctx.set_fill_color(Color::rgba(0.5, 0.5, 0.5, 0.10));
ctx.begin_path();
ctx.rect(pad, cy, table_w, *row_h);
ctx.fill();
}
let mut cx = pad;
for (ci, width) in col_widths.iter().enumerate() {
ctx.set_fill_color(v.separator);
ctx.begin_path();
ctx.rect(cx, cy, 1.0, *row_h);
ctx.rect(cx, cy, *width, 1.0);
ctx.fill();
if let Some(text) = row.get(ci) {
ctx.set_fill_color(v.text_color);
ctx.fill_text(text, cx + 8.0, cy + row_h * 0.36);
}
cx += width;
}
ctx.set_fill_color(v.separator);
ctx.begin_path();
ctx.rect(pad + table_w, cy, 1.0, *row_h);
ctx.fill();
}
ctx.set_fill_color(v.separator);
ctx.begin_path();
ctx.rect(pad, content_y + row_h * rows.len() as f64, table_w, 1.0);
ctx.fill();
ctx.restore();
if *content_width > *viewport_width {
self.paint_block_scrollbar(
ctx,
*y,
*viewport_width,
*content_width,
scroll_x,
);
}
}
LayoutItem::CodeBlock {
block_idx,
lines,
y,
height,
line_h,
viewport_width,
content_width,
} => {
let code_pad_x = self.font_size;
let code_pad_y = self.font_size * 0.75;
let fs = LineStyle::Code.font_size(self.font_size);
let scroll_x = self.block_scroll_offset(*block_idx);
let scrollbar_h = if content_width > viewport_width {
BLOCK_SCROLLBAR_H + BLOCK_SCROLLBAR_GAP
} else {
0.0
};
let content_y = y + scrollbar_h;
let content_h = height - scrollbar_h;
ctx.set_font_size(fs);
ctx.set_fill_color(Color::rgba(0.5, 0.5, 0.5, 0.12));
ctx.begin_path();
ctx.rounded_rect(pad, *y, *viewport_width, *height, 4.0);
ctx.fill();
ctx.set_fill_color(v.text_color);
ctx.save();
ctx.clip_rect(pad, content_y, *viewport_width, content_h);
ctx.translate(-scroll_x, 0.0);
let metrics = measure_text_metrics(&font, "", fs);
let mut line_top = content_y + content_h - code_pad_y - line_h;
for line in lines {
let ty = line_top + line_h * 0.5;
let text_y = ty - (metrics.ascent - metrics.descent) * 0.5;
ctx.fill_text(line, pad + code_pad_x, text_y);
line_top -= line_h;
}
ctx.restore();
if *content_width > *viewport_width {
self.paint_block_scrollbar(
ctx,
*y,
*viewport_width,
*content_width,
scroll_x,
);
}
}
}
}
}
fn paint_block_scrollbar(
&self,
ctx: &mut dyn DrawCtx,
block_y: f64,
viewport_width: f64,
content_width: f64,
offset: f64,
) {
let bar = scrollbar_rect(block_y, viewport_width);
let thumb = scrollbar_thumb(bar, viewport_width, content_width, offset);
ctx.set_fill_color(Color::rgba(0.5, 0.5, 0.5, 0.18));
ctx.begin_path();
ctx.rounded_rect(self.padding + bar.x, bar.y, bar.width, bar.height, 4.0);
ctx.fill();
ctx.set_fill_color(Color::rgba(0.5, 0.5, 0.5, 0.55));
ctx.begin_path();
ctx.rounded_rect(
self.padding + thumb.x,
thumb.y,
thumb.width,
thumb.height,
4.0,
);
ctx.fill();
}
}