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use crate::error::{PackageError, PartNotFoundExt, PptxError, PptxResult};
use crate::opc::constants::relationship_type as RT;
use crate::slide::{
extract_layout_r_ids, layout_used_by_slides, parse_layout_name, parse_slide_master_ids,
remove_layout_from_master_xml, SlideLayoutRef, SlideMasterRef,
};
use crate::units::RelationshipId;
use super::Presentation;
/// Layout, master, theme, and `SmartArt` methods for `Presentation`.
impl Presentation {
/// Get references to all slide masters in the presentation.
///
/// # Errors
///
/// Returns an error if the presentation XML cannot be parsed.
pub fn slide_masters(&self) -> PptxResult<Vec<SlideMasterRef>> {
let pres_part = self.presentation_part()?;
let master_ids = parse_slide_master_ids(&pres_part.blob)?;
let base_uri = pres_part.partname.base_uri();
let mut masters = Vec::with_capacity(master_ids.len());
for (r_id_str, _id) in master_ids {
let rel = pres_part.rels.get(&r_id_str).ok_or_else(|| {
PptxError::Package(PackageError::RelationshipNotFound(format!(
"slide master relationship {r_id_str} not found"
)))
})?;
let partname = rel.target_partname(base_uri)?;
let r_id = RelationshipId::try_from(r_id_str.as_str()).map_err(|_| {
PptxError::InvalidXml(format!("invalid slide master rId: {r_id_str}"))
})?;
masters.push(SlideMasterRef { r_id, partname });
}
Ok(masters)
}
/// Get references to all slide layouts available in the presentation.
///
/// Collects layouts from all slide masters, with the first master's layouts first.
/// # Errors
///
/// Returns an error if layouts cannot be resolved.
pub fn slide_layouts(&self) -> PptxResult<Vec<SlideLayoutRef>> {
let masters = self.slide_masters()?;
let mut layouts = Vec::new();
for master_ref in &masters {
let master_part = self
.package
.part(&master_ref.partname)
.or_part_not_found(master_ref.partname.as_str())?;
let layout_r_ids = extract_layout_r_ids(&master_part.rels);
let base_uri = master_part.partname.base_uri();
for r_id_str in layout_r_ids {
let rel = master_part.rels.get(&r_id_str).ok_or_else(|| {
PptxError::Package(PackageError::RelationshipNotFound(r_id_str.clone()))
})?;
let partname = rel.target_partname(base_uri)?;
// Read the layout name and resolve its slide master
let (name, slide_master_part_name) = match self.package.part(&partname) {
None => (String::new(), Some(master_ref.partname.to_string())),
Some(layout_part) => {
let name = parse_layout_name(&layout_part.blob)?;
let master_rels = layout_part.rels.all_by_reltype(RT::SLIDE_MASTER);
let slide_master = master_rels
.first()
.and_then(|r| {
r.target_partname(layout_part.partname.base_uri())
.ok()
.map(super::super::opc::pack_uri::PackURI::into_string)
})
// Fallback: use the master we're iterating from
.or_else(|| Some(master_ref.partname.to_string()));
(name, slide_master)
}
};
let r_id = RelationshipId::try_from(r_id_str.as_str()).map_err(|_| {
PptxError::InvalidXml(format!("invalid layout rId: {r_id_str}"))
})?;
layouts.push(SlideLayoutRef {
r_id,
partname,
name,
slide_master_part_name,
});
}
}
Ok(layouts)
}
/// Get the slide master for a given slide layout.
///
/// Uses the `slide_master_part_name` stored on the layout reference to find
/// the matching `SlideMasterRef`.
/// # Errors
///
/// Returns an error if slide masters cannot be resolved.
pub fn slide_master_for_layout(
&self,
layout: &SlideLayoutRef,
) -> PptxResult<Option<SlideMasterRef>> {
let Some(master_part_name) = &layout.slide_master_part_name else {
return Ok(None);
};
let masters = self.slide_masters()?;
for master in masters {
if master.partname.as_str() == master_part_name {
return Ok(Some(master));
}
}
Ok(None)
}
/// Remove a slide layout from the presentation.
///
/// Removes the layout part, its relationship from the parent slide master,
/// and its `<p:sldLayoutId>` entry in the master XML.
///
/// Returns an error if any slides are still using this layout.
/// # Errors
///
/// Returns an error if the layout is in use or cannot be found.
pub fn remove_slide_layout(&mut self, layout_ref: &SlideLayoutRef) -> PptxResult<()> {
// Check if any slides use this layout
let slides = self.slides()?;
let users = layout_used_by_slides(&layout_ref.partname, &slides, &self.package);
if !users.is_empty() {
return Err(PptxError::InvalidXml(format!(
"cannot remove layout '{}': still used by {} slide(s)",
layout_ref.name,
users.len()
)));
}
// Find the slide master that owns this layout
let masters = self.slide_masters()?;
for master_ref in &masters {
let master_part = self
.package
.part(&master_ref.partname)
.or_part_not_found(master_ref.partname.as_str())?;
// Check if this master has the layout as a relationship
let layout_rels = master_part.rels.all_by_reltype(RT::SLIDE_LAYOUT);
let mut found_r_id = None;
for rel in &layout_rels {
if let Ok(target) = rel.target_partname(master_part.partname.base_uri()) {
if target.as_str() == layout_ref.partname.as_str() {
found_r_id = Some(rel.r_id.clone());
break;
}
}
}
if let Some(r_id) = found_r_id {
// Remove the layout from the master XML
let master_partname = master_ref.partname.clone();
let master_part_mut = self
.package
.part_mut(&master_partname)
.or_part_not_found(master_partname.as_str())?;
master_part_mut.blob =
remove_layout_from_master_xml(&master_part_mut.blob, r_id.as_str())?;
// Remove the relationship
master_part_mut.rels.remove(r_id.as_str());
// Remove the layout part
self.package.remove_part(&layout_ref.partname);
return Ok(());
}
}
Err(PptxError::Package(PackageError::PartNotFound(format!(
"layout '{}' not found in any slide master",
layout_ref.name
))))
}
/// Get the theme color scheme from the first slide master's theme.
///
/// Reads the theme part linked from the first slide master and extracts
/// the 12 theme color slots (dk1, dk2, lt1, lt2, accent1-6, hlink, folHlink).
///
/// Returns `None` if no theme can be found or parsed.
/// # Errors
///
/// Returns an error if the theme XML cannot be parsed.
pub fn theme_colors(&self) -> PptxResult<Option<crate::theme::ThemeColorScheme>> {
// Get the first slide master
let masters = self.slide_masters()?;
let Some(master_ref) = masters.first() else {
return Ok(None);
};
// Get the master part and find its theme relationship
let master_part = self
.package
.part(&master_ref.partname)
.or_part_not_found(master_ref.partname.as_str())?;
let theme_rels = master_part.rels.all_by_reltype(RT::THEME);
let Some(theme_rel) = theme_rels.first() else {
return Ok(None);
};
let theme_partname = theme_rel.target_partname(master_part.partname.base_uri())?;
let Some(theme_part) = self.package.part(&theme_partname) else {
return Ok(None);
};
crate::theme::parse_theme_color_scheme(&theme_part.blob)
}
/// Read `SmartArt` diagram parts for a given slide and relationship ID.
///
/// The `r_id` should come from `GraphicFrame::smartart_r_id`. The method
/// resolves the diagram data part from the slide's relationships and
/// collects the associated colour, style, layout, and drawing parts.
///
/// # Errors
///
/// Returns an error if the parts cannot be resolved.
pub fn smartart_data(
&self,
r_id: &str,
slide_ref: &crate::slide::SlideRef,
) -> PptxResult<Option<crate::smartart::SmartArt>> {
use crate::smartart::smartart_rel_type as SRT;
let slide_part = self
.package
.part(&slide_ref.partname)
.or_part_not_found(slide_ref.partname.as_str())?;
// Resolve the diagram data part from the slide's relationship
let Some(rel) = slide_part.rels.get(r_id) else {
return Ok(None);
};
let data_partname = rel.target_partname(slide_part.partname.base_uri())?;
let Some(data_part) = self.package.part(&data_partname) else {
return Ok(None);
};
// Clone is required: SmartArt owns its Vec<u8> fields and outlives the borrow on `self`.
let data_xml = data_part.blob.clone();
// Helper: try to read a related part by relationship type from the slide.
// Clone is required for each part because SmartArt owns its data.
let read_optional = |reltype: &str| -> Option<Vec<u8>> {
let rels = slide_part.rels.all_by_reltype(reltype);
for r in rels {
if let Ok(pn) = r.target_partname(slide_part.partname.base_uri()) {
if let Some(p) = self.package.part(&pn) {
return Some(p.blob.clone());
}
}
}
None
};
Ok(Some(crate::smartart::SmartArt {
data_xml,
colors_xml: read_optional(SRT::DIAGRAM_COLORS),
style_xml: read_optional(SRT::DIAGRAM_STYLE),
layout_xml: read_optional(SRT::DIAGRAM_LAYOUT),
drawing_xml: read_optional(SRT::DIAGRAM_DRAWING),
}))
}
}