Trait LazySlideSource

Source

pub trait LazySlideSource {
    // Required methods
    fn slide_count(&self) -> usize;
    fn generate_slide(&self, index: usize) -> Option<SlideContent>;

    // Provided methods
    fn slide_features(&self, index: usize) -> Option<(bool, usize)> { ... }
    fn slide_has_notes(&self, index: usize) -> bool { ... }
    fn slide_chart_count(&self, index: usize) -> usize { ... }
}

Expand description

Lazy slide source - allows generating slides on-demand instead of all at once. This is useful for:

Very large presentations that don’t fit in memory
Dynamically generated slide content
Streaming data sources

§Example

use std::fs::File;
use ppt_rs::{create_pptx_lazy_to_writer, LazySlideSource, SlideContent};

struct MySlideGenerator {
    count: usize,
}

impl LazySlideSource for MySlideGenerator {
    fn slide_count(&self) -> usize {
        self.count
    }

    fn generate_slide(&self, index: usize) -> Option<SlideContent> {
        if index < self.count {
            Some(SlideContent::new(&format!("Slide {}", index + 1))
                .add_bullet(&format!("Content {}", index + 1)))
        } else {
            None
        }
    }
}

let file = File::create("output.pptx")?;
create_pptx_lazy_to_writer(file, "My Presentation", Box::new(MySlideGenerator { count: 100 }), None)?;