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file_model: Remove next() and previous() functions

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These functions required iterating to find the
index of a file and then adding one to it.
We can be smarter, using an index we already
have and adding or subtracting where appropriate.
This commit is contained in:
Christopher Davis 2022-06-29 13:37:55 -04:00
parent 10cdb2c519
commit e13ecb4df4
2 changed files with 6 additions and 23 deletions
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11
src/widgets/image_view.rs
View file

@ -143,7 +143,6 @@ impl LpImageView {
}
self.build_model_from_file(file);
self.update_action_state(file);
self.notify("filename");
// TODO: rework width stuff
@ -192,6 +191,7 @@ impl LpImageView {
imp.filename.replace(util::get_file_display_name(file));
carousel.append(&LpImagePage::from_file(file));
self.fill_carousel(model, index);
self.update_action_state(index);
}
}
@ -243,6 +243,7 @@ impl LpImageView {
// Clear everything on either side, then refill
self.clear_carousel(true);
self.fill_carousel(model, new_index);
self.update_action_state(new_index);
drop(guard);
}
@ -293,13 +294,13 @@ impl LpImageView {
}
}
pub fn update_action_state(&self, file: &gio::File) {
pub fn update_action_state(&self, index: u32) {
let imp = self.imp();
let b = imp.model.borrow();
let model = b.as_ref().unwrap();
let next_enabled = model.next(file).is_some();
let prev_enabled = model.previous(file).is_some();
let next_enabled = model.item(index + 1).is_some();
let prev_enabled = index.checked_sub(1).and_then(|i| model.item(i)).is_some();
self.action_set_enabled("iv.next", next_enabled);
self.action_set_enabled("iv.previous", prev_enabled);
@ -318,7 +319,7 @@ impl LpImageView {
if model_index != prev_index {
imp.filename.replace(util::get_file_display_name(&current));
self.notify("filename");
self.update_action_state(&current);
self.update_action_state(model_index);
// We've moved forward
if let Some(diff) = model_index.checked_sub(prev_index) {