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Show only single page on left when at last page

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This way one can easily see when the last page is reached
This commit is contained in:
Julian Mutter 2023-11-28 09:42:20 +01:00
parent 79ddd2680b
commit 72e19cd5a2
2 changed files with 21 additions and 9 deletions
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13
src/cache.rs
View File

@ -132,11 +132,14 @@ impl PageCache {
CacheCommand::Retrieve(command) => match command {
RetrievePagesCommand::GetCurrentTwoPages { page_left_number } => {
let page_left = self.get_page_or_cache(page_left_number)?;
let page_right = self.get_page_or_cache(page_left_number + 1)?;
Ok(Some(CacheResponse::TwoPagesRetrieved {
page_left,
page_right,
}))
if let Ok(page_right) = self.get_page_or_cache(page_left_number + 1) {
Ok(Some(CacheResponse::TwoPagesRetrieved {
page_left,
page_right,
}))
} else {
Ok(Some(CacheResponse::SinglePageRetrieved { page: page_left }))
}
}
RetrievePagesCommand::GetCurrentPage { page_number } => {
let page = self.get_page_or_cache(page_number)?;

17
src/ui.rs
View File

@ -44,7 +44,7 @@ impl DocumentCanvas {
}
pub fn increase_page_number(&mut self) {
if self.current_page_number >= self.num_pages.unwrap_or(0).saturating_sub(2) {
if self.current_page_number >= self.num_pages.unwrap_or(0).saturating_sub(1) {
return;
}
@ -64,12 +64,14 @@ impl DocumentCanvas {
pub fn cache_surrounding_pages(&self, area_height: i32) {
self.page_cache_sender.send_cache_commands(
&[self.current_page_number.saturating_sub(2),
&[
self.current_page_number.saturating_sub(2),
self.current_page_number.saturating_sub(1),
self.current_page_number,
self.current_page_number + 1,
self.current_page_number + 2,
self.current_page_number + 3],
self.current_page_number + 3,
],
area_height,
);
}
@ -316,7 +318,13 @@ pub fn load_document(file: impl AsRef<Path>, ui: Rc<RefCell<Ui>>) {
clone!(@weak ui => move |cache_response| match cache_response {
cache::CacheResponse::SinglePageRetrieved { page } => {
ui.borrow_mut().image_left.set_paintable(Some(page.as_ref()));
ui.borrow_mut().image_right.set_visible(false);
if ui.borrow().document_canvas.as_ref().map(|canvas| canvas.num_pages.unwrap_or(0)).unwrap_or(0) > 1 {
// Make image invisible but keep free space in layout
ui.borrow_mut().image_right.set_opacity(0.0);
} else {
// Make image invisible and center left page in layout
ui.borrow_mut().image_right.set_visible(false);
}
let area_height = ui.borrow().image_container.height();
ui.borrow().document_canvas.as_ref().unwrap().cache_surrounding_pages(area_height);
}
@ -327,6 +335,7 @@ pub fn load_document(file: impl AsRef<Path>, ui: Rc<RefCell<Ui>>) {
ui.borrow_mut().image_left.set_paintable(Some(page_left.as_ref()));
ui.borrow_mut().image_right.set_paintable(Some(page_right.as_ref()));
ui.borrow_mut().image_right.set_visible(true);
ui.borrow_mut().image_right.set_opacity(1.0);
let area_height = ui.borrow().image_container.height();
ui.borrow().document_canvas.as_ref().unwrap().cache_surrounding_pages(area_height);
},