Taking time for drawing and caching

src/cache.rs

@@ -3,6 +3,7 @@ use std::{
     collections::BTreeMap,
     path::{Path, PathBuf},
     rc::Rc,
+    time::Instant,
 };
 
 use async_channel::Sender;
@@ -31,6 +32,7 @@ impl PageCache {
 
     pub fn cache_pages(&mut self, page_numbers: Vec<usize>) {
         println!("Caching pages {:?}", page_numbers);
+        let begin_of_cashing = Instant::now();
         for page_number in page_numbers {
             if self.pages.contains_key(&page_number) {
                 continue;
@@ -44,7 +46,10 @@ impl PageCache {
                 }
             }
         }
-        println!("done caching");
+        println!(
+            "done caching in {}ms",
+            begin_of_cashing.elapsed().as_millis()
+        );
     }
 
     fn remove_most_distant_page(&mut self, current_page_number: usize) -> Result<(), ()> {

src/draw.rs

@@ -1,3 +1,5 @@
+use std::time::Instant;
+
 use cairo::Context;
 
 use crate::ui::DocumentCanvas;
@@ -10,13 +12,17 @@ pub fn draw(
 ) {
     println!("Draw");
     if let Some(document_canvas) = document_canvas {
+        let begin_of_drawing = Instant::now();
         if document_canvas.num_pages.unwrap_or(0) > 1 {
             draw_two_pages(document_canvas, context, area_width, area_height);
         } else {
             draw_single_page(document_canvas, context, area_width, area_height);
         }
 
-        println!("Finished drawing");
+        println!(
+            "Finished drawing in {}ms",
+            begin_of_drawing.elapsed().as_millis()
+        );
         document_canvas.cache_surrounding_pages();
     }
 }