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window: Put prev/next accels at window level

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Tried to make things more stateless and RefCell usage for robust
- Use object properties to control the action enabled/disabled
- Borrow model RefCell for only one line or use .replace()
- Don't pass models around and borrow as short as possible instead

Fixes #20
This commit is contained in:
Sophie Herold 2022-12-06 18:24:32 +01:00 • committed by Christopher Davis
parent ba77ee1a32
commit 36000ff65c
4 changed files with 102 additions and 48 deletions
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93
src/widgets/image_view.rs
View file

@ -78,14 +78,6 @@ mod imp {
fn class_init(klass: &mut Self::Class) {
Self::bind_template(klass);
Self::Type::bind_template_callbacks(klass);
klass.install_action("iv.next", None, move |image_view, _, _| {
image_view.navigate(adw::NavigationDirection::Forward);
});
klass.install_action("iv.previous", None, move |image_view, _, _| {
image_view.navigate(adw::NavigationDirection::Back);
});
}
fn instance_init(obj: &glib::subclass::InitializingObject<Self>) {
@ -103,6 +95,12 @@ mod imp {
glib::ParamSpecObject::builder::<LpImagePage>("current-page-strict")
.read_only()
.build(),
glib::ParamSpecBoolean::builder("is-previous-available")
.read_only()
.build(),
glib::ParamSpecBoolean::builder("is-next-available")
.read_only()
.build(),
]
});
@ -114,6 +112,8 @@ mod imp {
match psec.name() {
"active-file" => obj.active_file().to_value(),
"current-page-strict" => obj.current_page_strict().to_value(),
"is-previous-available" => obj.is_previous_available().to_value(),
"is-next-available" => obj.is_next_available().to_value(),
_ => unimplemented!(),
}
}
@ -236,28 +236,31 @@ impl LpImageView {
let model = {
// Here we use a nested scope so that the mutable borrow only lasts as long as we need it
let mut model_store = imp.model.borrow_mut();
if let Some(ref m) = *model_store {
let is_same_directory = file
.parent()
.map_or(false, |p| m.directory().map_or(false, |f| !f.equal(&p)));
if imp.model.borrow().is_some() {
let is_same_directory = !file.parent().map_or(false, |p| {
imp.model
.borrow()
.as_ref()
.and_then(|x| x.directory())
.map_or(false, |f| !f.equal(&p))
});
if is_same_directory {
log::debug!("Re-using old model and navigating to the current file");
self.navigate_to_file(file);
return Ok(());
} else {
// Clear the carousel before creating the new model
self.clear_carousel(false);
let model = LpFileModel::from_file(file)?;
*model_store = Some(model.clone());
imp.model.replace(Some(model.clone()));
log::debug!("new model created");
model
} else {
log::debug!("Re-using old model and navigating to the current file");
self.navigate_to_file(m, file);
return Ok(());
}
} else {
let model = LpFileModel::from_file(file)?;
*model_store = Some(model.clone());
imp.model.replace(Some(model.clone()));
log::debug!("first model created");
model
}
@ -266,9 +269,10 @@ impl LpImageView {
let page = LpImagePage::from_file(file);
imp.current_page_strict.replace(Some(page.clone()));
self.notify("current-page-strict");
self.notify("is-previous-available");
self.notify("is-next-available");
carousel.append(&page);
self.update_action_state(&model, 0);
spawn!(glib::clone!(@weak self as obj, @strong file => async move {
if let Err(err) = model.load_directory().await {
@ -285,7 +289,6 @@ impl LpImageView {
log::debug!("Currently at file {index} in the directory");
obj.fill_carousel(&model, index);
obj.update_action_state(&model, index);
}));
Ok(())
@ -309,11 +312,16 @@ impl LpImageView {
};
}
fn navigate_to_file(&self, model: &LpFileModel, file: &gio::File) {
fn navigate_to_file(&self, file: &gio::File) {
let imp = self.imp();
let Some(new_index) = imp.model.borrow().as_ref().and_then(|model| model.index_of(file)) else {
log::warn!("Could not navigate to file {:?}", file.path());
return;
};
let carousel = imp.carousel.get();
let current_index = imp.current_model_index.get();
let new_index = model.index_of(file).unwrap_or_default();
if new_index == current_index {
return;
@ -334,6 +342,9 @@ impl LpImageView {
log::debug!("Scrolling to page for {new_index}");
imp.scrolling.set(true);
carousel.scroll_to(&page, true);
self.notify("is-previous-available");
self.notify("is-next-available");
}
// Fills the carousel with items on either side of the given `index` of `model`
@ -355,6 +366,9 @@ impl LpImageView {
log::debug!("Carousel filled, current file at index {index}");
imp.current_model_index.set(index);
self.notify("is-previous-available");
self.notify("is-next-available");
}
// Clear the carousel, optionally preserving the current position
@ -377,14 +391,33 @@ impl LpImageView {
carousel.remove(&carousel.nth_page(0));
}
}
self.notify("is-previous-available");
self.notify("is-next-available");
}
pub fn update_action_state(&self, model: &LpFileModel, index: u32) {
let next_enabled = model.item(index + 1).is_some();
let prev_enabled = index.checked_sub(1).and_then(|i| model.item(i)).is_some();
/// Returns `true` if there is an image before the current one
pub fn is_previous_available(&self) -> bool {
let imp = self.imp();
if let Some(model) = imp.model.borrow().as_ref() {
imp.current_model_index
.get()
.checked_sub(1)
.and_then(|i| model.item(i))
.is_some()
} else {
false
}
}
self.action_set_enabled("iv.next", next_enabled);
self.action_set_enabled("iv.previous", prev_enabled);
/// Returns `true` if there is an image after the current one
pub fn is_next_available(&self) -> bool {
let imp = self.imp();
if let Some(model) = imp.model.borrow().as_ref() {
model.item(imp.current_model_index.get() + 1).is_some()
} else {
false
}
}
#[template_callback]
@ -410,7 +443,6 @@ impl LpImageView {
// and refill the page buffer.
self.clear_carousel(true);
self.fill_carousel(model, model_index);
self.update_action_state(model, model_index);
} else {
self.update_page_buffer(model, carousel, model_index, prev_index);
}
@ -425,7 +457,6 @@ impl LpImageView {
prev_index: u32,
) {
let imp = self.imp();
self.update_action_state(model, model_index);
// We've moved forward
if let Some(diff) = model_index.checked_sub(prev_index) {
@ -466,6 +497,8 @@ impl LpImageView {
}
imp.current_model_index.set(model_index);
self.notify("is-previous-available");
self.notify("is-next-available");
}
#[template_callback]