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image_view: Switch from expressions to signal groups

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Expressions have the leak issue mentioned in the previous
commit, but we were using them in a few scenarios where
they couldn't be used in UI files.

Since these expressions don't set a property but instead
trigger behavior, the appropriate API to use is GSignalGroup.
This commit switches the expressions on the image to use
GSignalGroup instead.
This commit is contained in:
Christopher Davis 2023-03-02 22:43:29 -05:00 • committed by Sophie Herold
parent ae41a77521
commit aab50af31a
1 changed files with 29 additions and 18 deletions
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47
src/widgets/image_view.rs
View file

@ -44,6 +44,8 @@ use std::path::{Path, PathBuf};
const BUFFER: usize = 2;
mod imp {
use once_cell::sync::OnceCell;
use super::*;
#[derive(Debug, Default, CompositeTemplate)]
@ -63,6 +65,8 @@ mod imp {
pub model: RefCell<LpFileModel>,
pub preserve_content: Cell<bool>,
pub current_image_signals: OnceCell<glib::SignalGroup>,
}
#[glib::object_subclass]
@ -118,25 +122,32 @@ mod imp {
// Manually mange widget layout, see `WidgetImpl` for details
obj.set_layout_manager(None::<gtk::LayoutManager>);
obj.property_expression("current-page")
.chain_property::<LpImagePage>("image")
.chain_property::<LpImage>("path")
.watch(
glib::Object::NONE,
glib::clone!(@weak obj => move || {
obj.current_image_path_changed();
}),
);
let signal_group = glib::SignalGroup::new(LpImage::static_type());
obj.connect_notify_local(
Some("current-page"),
clone!(@weak signal_group => move |obj, _| {
signal_group.set_target(obj.current_image().as_ref());
}),
);
obj.property_expression("current-page")
.chain_property::<LpImagePage>("image")
.chain_property::<LpImage>("is-deleted")
.watch(
glib::Object::NONE,
glib::clone!(@weak obj => move || {
obj.current_image_path_changed();
}),
);
let view = &*obj;
signal_group.connect_closure(
"notify::path",
true,
glib::closure_local!(@watch view => move |_: LpImage, _: glib::ParamSpec| {
view.current_image_path_changed();
}),
);
signal_group.connect_closure(
"notify::is-deleted",
true,
glib::closure_local!(@watch view => move |_: LpImage, _: glib::ParamSpec| {
view.current_image_path_changed();
}),
);
self.current_image_signals.set(signal_group).unwrap();
let source = gtk::DragSource::new();
source.set_exclusive(true);