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//! Shared block stacker — used by both page-level and cell-level layout.
use super::super::draw_command::DrawCommand;
use super::super::float;
use super::super::paragraph::layout_paragraph;
use super::super::table::layout_table;
use super::helpers::table_x_offset;
use super::types::{FloatingImageY, LayoutBlock};
use crate::render::dimension::Pt;
use crate::render::geometry::PtRect;
/// Result of stacking blocks vertically.
pub struct StackResult {
/// Draw commands positioned relative to the stacking origin (0,0).
pub commands: Vec<DrawCommand>,
/// Total height consumed by all blocks.
pub height: Pt,
}
/// Stack blocks vertically within a fixed-width area.
///
/// This is the shared core used by both page-level layout (`layout_section`)
/// and cell-level layout. It handles:
/// - Paragraph layout with spacing collapse and space_before suppression
/// - Table layout
/// - Floating image registration and text wrapping
///
/// It does NOT handle page breaks, column breaks, or footnote collection —
/// those are page-level concerns managed by `layout_section`.
pub fn stack_blocks(
blocks: &[LayoutBlock],
content_width: Pt,
default_line_height: Pt,
measure_text: super::super::paragraph::MeasureTextFn<'_>,
) -> StackResult {
let constraints = super::super::BoxConstraints::tight_width(content_width, Pt::INFINITY);
let mut commands = Vec::new();
let mut cursor_y = Pt::ZERO;
let mut prev_space_after = Pt::ZERO;
let mut prev_style_id: Option<crate::model::StyleId> = None;
let mut page_floats: Vec<float::ActiveFloat> = Vec::new();
for block in blocks {
match block {
LayoutBlock::Paragraph {
fragments,
style,
floating_images,
floating_shapes,
..
} => {
let mut effective_style = style.clone_for_layout();
// Spacing collapse.
if effective_style.contextual_spacing
&& effective_style.style_id.is_some()
&& effective_style.style_id == prev_style_id
{
cursor_y -= prev_space_after + effective_style.space_before;
} else {
let collapse = prev_space_after.min(effective_style.space_before);
cursor_y -= collapse;
}
// Register floating images.
let content_top = cursor_y + effective_style.space_before;
for fi in floating_images.iter() {
let (y_start, y_end) = match fi.y {
FloatingImageY::RelativeToParagraph(offset) => {
(content_top + offset, content_top + offset + fi.size.height)
}
FloatingImageY::Absolute(img_y) => (img_y, img_y + fi.size.height),
};
if fi.is_wrap_top_and_bottom() {
let img_y = match fi.y {
FloatingImageY::Absolute(y) => y,
FloatingImageY::RelativeToParagraph(offset) => content_top + offset,
};
commands.push(DrawCommand::Image {
rect: PtRect::from_xywh(fi.x, img_y, fi.size.width, fi.size.height),
image_data: fi.image_data.clone(),
});
if y_end > cursor_y {
cursor_y = y_end;
}
} else {
page_floats.push(float::ActiveFloat {
page_x: fi.x - fi.dist_left,
page_y_start: y_start,
page_y_end: y_end,
width: fi.size.width + fi.dist_left + fi.dist_right,
source: float::FloatSource::Image,
wrap_text: fi.wrap_mode.wrap_text().into(),
});
}
}
// §20.4.2: register floating shapes (DrawingML). Mirrors the
// image branch above: `TopAndBottom` emits now and advances
// the cursor; wrap-enabled modes (Square/Tight/Through) are
// registered as active floats so subsequent lines narrow
// around them. `None` shapes emit after the paragraph.
for fs in floating_shapes.iter() {
use crate::render::layout::section::WrapMode;
if matches!(fs.wrap_mode, WrapMode::None) {
continue;
}
let (y_start, y_end) = match fs.y {
FloatingImageY::RelativeToParagraph(offset) => {
(content_top + offset, content_top + offset + fs.size.height)
}
FloatingImageY::Absolute(y) => (y, y + fs.size.height),
};
if fs.is_wrap_top_and_bottom() {
let shape_y = match fs.y {
FloatingImageY::Absolute(y) => y,
FloatingImageY::RelativeToParagraph(offset) => content_top + offset,
};
commands.push(DrawCommand::Path {
origin: crate::render::geometry::PtOffset::new(fs.x, shape_y),
rotation: fs.rotation,
flip_h: fs.flip_h,
flip_v: fs.flip_v,
extent: fs.size,
paths: fs.paths.clone(),
fill: fs.fill.clone(),
stroke: fs.stroke.clone(),
effects: fs.effects.clone(),
});
if y_end > cursor_y {
cursor_y = y_end;
}
} else {
page_floats.push(float::ActiveFloat {
page_x: fs.x - fs.dist_left,
page_y_start: y_start,
page_y_end: y_end,
width: fs.size.width + fs.dist_left + fs.dist_right,
source: float::FloatSource::Shape,
wrap_text: fs.wrap_mode.wrap_text().into(),
});
}
}
float::prune_floats(&mut page_floats, cursor_y);
effective_style.page_floats = page_floats.clone();
effective_style.page_y = cursor_y;
effective_style.page_x = Pt::ZERO;
effective_style.page_content_width = content_width;
let para = layout_paragraph(
fragments,
&constraints,
&effective_style,
default_line_height,
measure_text,
);
for mut cmd in para.commands {
cmd.shift_y(cursor_y);
commands.push(cmd);
}
cursor_y += para.size.height;
// Emit non-wrapTopAndBottom floating images.
let para_content_top = cursor_y - para.size.height + effective_style.space_before;
for fi in floating_images {
if fi.is_wrap_top_and_bottom() {
continue;
}
let img_y = match fi.y {
FloatingImageY::Absolute(y) => y,
FloatingImageY::RelativeToParagraph(offset) => para_content_top + offset,
};
commands.push(DrawCommand::Image {
rect: PtRect::from_xywh(fi.x, img_y, fi.size.width, fi.size.height),
image_data: fi.image_data.clone(),
});
// Extend cursor to encompass the image so table cells
// expand to contain floating images.
let img_bottom = img_y + fi.size.height;
if img_bottom > cursor_y {
cursor_y = img_bottom;
}
}
// Emit floating shapes (DrawingML). `TopAndBottom` shapes
// were emitted pre-layout along with the `cursor_y` advance;
// skip them here. `None` + Square/Tight/Through emit now at
// their resolved anchor position (the shape's bounding rect
// is already registered as an active float for wrap modes).
for fs in floating_shapes {
if fs.is_wrap_top_and_bottom() {
continue;
}
let shape_y = match fs.y {
FloatingImageY::Absolute(y) => y,
FloatingImageY::RelativeToParagraph(offset) => para_content_top + offset,
};
commands.push(DrawCommand::Path {
origin: crate::render::geometry::PtOffset::new(fs.x, shape_y),
rotation: fs.rotation,
flip_h: fs.flip_h,
flip_v: fs.flip_v,
extent: fs.size,
paths: fs.paths.clone(),
fill: fs.fill.clone(),
stroke: fs.stroke.clone(),
effects: fs.effects.clone(),
});
}
prev_space_after = effective_style.space_after;
prev_style_id = effective_style.style_id.clone();
}
LayoutBlock::Table {
rows,
col_widths,
border_config,
indent,
alignment,
..
} => {
// stack_blocks is used for table cells and header/footer —
// no adjacent table collapse in these contexts.
let table = layout_table(
rows,
col_widths,
&constraints,
default_line_height,
border_config.as_ref(),
measure_text,
false,
);
let table_x = table_x_offset(
*alignment,
*indent,
table.size.width,
content_width,
Pt::ZERO,
);
for mut cmd in table.commands {
cmd.shift_y(cursor_y);
cmd.shift_x(table_x);
commands.push(cmd);
}
cursor_y += table.size.height;
prev_space_after = Pt::ZERO;
prev_style_id = None;
}
}
}
StackResult {
commands,
height: cursor_y,
}
}