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use crate::excel::XmlReader;
use anyhow::bail;
use quick_xml::events::{BytesStart, Event};
use std::io::Read;
use super::effect_container::XlsxEffectContainer;
/// blend (Blend Effect)
///
/// Specifies a blend of several effects.
/// The container specifies the raw effects to blend while the blend mode specifies how the effects are to be blended.
///
/// https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.drawing.blend?view=openxml-3.0.1
#[derive(Debug, Clone, PartialEq)]
pub struct XlsxBlend {
// children
/// specifies the raw effects to blend
pub cont: Option<Box<XlsxEffectContainer>>,
// attributes
/// Specifies how to blend the two effects
/// Allowed values: https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.drawing.blendmodevalues?view=openxml-3.0.1
pub blend: Option<String>,
}
impl XlsxBlend {
pub(crate) fn load(reader: &mut XmlReader<impl Read>, e: &BytesStart) -> anyhow::Result<Self> {
let attributes = e.attributes();
let mut blend = Self {
cont: None,
blend: None,
};
for a in attributes {
match a {
Ok(a) => {
let string_value = String::from_utf8(a.value.to_vec())?;
match a.key.local_name().as_ref() {
b"blend" => {
blend.blend = Some(string_value);
break;
}
_ => {}
}
}
Err(error) => {
bail!(error.to_string())
}
}
}
let mut buf = Vec::new();
loop {
buf.clear();
match reader.read_event_into(&mut buf) {
Ok(Event::Start(ref e)) if e.local_name().as_ref() == b"cont" => {
blend.cont = Some(Box::new(XlsxEffectContainer::load(reader, e)?));
}
Ok(Event::End(ref e)) if e.local_name().as_ref() == b"blend" => break,
Ok(Event::Eof) => bail!("unexpected end of file."),
Err(e) => bail!(e.to_string()),
_ => (),
}
}
Ok(blend)
}
}