HomeView: handle vadjustment with BaseView

Instead of using lazy_static to save the adjustment,
pass it to the widget upon creation. If its the first instance
created, pass None instead.

podcasts-gtk/src/stacks/home.rs

@@ -29,7 +29,7 @@ pub(crate) struct HomeStack {
 
 impl HomeStack {
     pub(crate) fn new(sender: Sender<Action>) -> Result<HomeStack, Error> {
-        let episodes = HomeView::new(sender.clone())?;
+        let episodes = HomeView::new(sender.clone(), None)?;
         let empty = EmptyView::new();
         let stack = gtk::Stack::new();
         let state = State::Empty;
@@ -54,12 +54,6 @@ impl HomeStack {
     }
 
     pub(crate) fn update(&mut self) -> Result<(), Error> {
-        // Copy the vertical scrollbar adjustment from the old view.
-        self.episodes
-            .save_alignment()
-            .map_err(|err| error!("Failed to set episodes_view alignment: {}", err))
-            .ok();
-
         self.replace_view()?;
         // Determine the actual state.
         self.determine_state().map_err(From::from)
@@ -68,7 +62,10 @@ impl HomeStack {
     fn replace_view(&mut self) -> Result<(), Error> {
         // Get the container of the view
         let old = &self.episodes.view.container().clone();
-        let eps = HomeView::new(self.sender.clone())?;
+
+        // Copy the vertical scrollbar adjustment from the old view.
+        let vadj = self.episodes.view.get_vadjustment();
+        let eps = HomeView::new(self.sender.clone(), vadj)?;
 
         // Remove the old widget and add the new one
         // during this the previous view is removed,

podcasts-gtk/src/widgets/home_view.rs

@@ -1,11 +1,9 @@
 use chrono::prelude::*;
 use failure::Error;
 
-use gtk;
-use gtk::prelude::*;
+use gtk::{self, prelude::*, Adjustment};
 
 use crossbeam_channel::Sender;
-use fragile::Fragile;
 use libhandy::{Column, ColumnExt};
 use podcasts_data::dbqueries;
 use podcasts_data::EpisodeWidgetModel;
@@ -16,12 +14,6 @@ use widgets::{BaseView, EpisodeWidget};
 
 use std::cell::Cell;
 use std::rc::Rc;
-use std::sync::Mutex;
-
-lazy_static! {
-    pub(crate) static ref EPISODES_VIEW_VALIGNMENT: Mutex<Option<Fragile<gtk::Adjustment>>> =
-        Mutex::new(None);
-}
 
 #[derive(Debug, Clone)]
 enum ListSplit {
@@ -94,74 +86,51 @@ impl Default for HomeView {
 
 // TODO: REFACTOR ME
 impl HomeView {
-    pub(crate) fn new(sender: Sender<Action>) -> Result<Rc<HomeView>, Error> {
+    pub(crate) fn new(
+        sender: Sender<Action>,
+        vadj: Option<Adjustment>,
+    ) -> Result<Rc<HomeView>, Error> {
         use self::ListSplit::*;
 
-        let view = Rc::new(HomeView::default());
+        let home = Rc::new(HomeView::default());
         let ignore = utils::get_ignored_shows()?;
         let episodes = dbqueries::get_episodes_widgets_filter_limit(&ignore, 100)?;
         let now_utc = Utc::now();
 
-        let view_ = view.clone();
+        let home_weak = Rc::downgrade(&home);
         let func = move |ep: EpisodeWidgetModel| {
+            let home = match home_weak.upgrade() {
+                Some(h) => h,
+                None => return,
+            };
+
             let epoch = ep.epoch();
             let widget = HomeEpisode::new(ep, &sender);
 
             match split(&now_utc, i64::from(epoch)) {
-                Today => add_to_box(&widget, &view_.today_list, &view_.today_box),
-                Yday => add_to_box(&widget, &view_.yday_list, &view_.yday_box),
-                Week => add_to_box(&widget, &view_.week_list, &view_.week_box),
-                Month => add_to_box(&widget, &view_.month_list, &view_.month_box),
-                Rest => add_to_box(&widget, &view_.rest_list, &view_.rest_box),
+                Today => add_to_box(&widget, &home.today_list, &home.today_box),
+                Yday => add_to_box(&widget, &home.yday_list, &home.yday_box),
+                Week => add_to_box(&widget, &home.week_list, &home.week_box),
+                Month => add_to_box(&widget, &home.month_list, &home.month_box),
+                Rest => add_to_box(&widget, &home.rest_list, &home.rest_box),
             }
         };
 
-        let view_ = view.clone();
+        let home_weak = Rc::downgrade(&home);
         let callback = move || {
-            view_
-                .set_vadjustment()
-                .map_err(|err| format!("{}", err))
-                .ok();
+            let home = match home_weak.upgrade() {
+                Some(h) => h,
+                None => return,
+            };
+
+            if let Some(ref v) = vadj {
+                home.view.set_adjutments(None, Some(v))
+            };
         };
 
         lazy_load_full(episodes, func, callback);
-        view.view.container().show_all();
-        Ok(view)
-    }
-
-    /// Set scrolled window vertical adjustment.
-    fn set_vadjustment(&self) -> Result<(), Error> {
-        let guard = EPISODES_VIEW_VALIGNMENT
-            .lock()
-            .map_err(|err| format_err!("Failed to lock widget align mutex: {}", err))?;
-
-        if let Some(ref fragile) = *guard {
-            // Copy the vertical scrollbar adjustment from the old view into the new one.
-            let res = fragile
-                .try_get()
-                .map(|x| utils::smooth_scroll_to(self.view.scrolled_window(), &x))
-                .map_err(From::from);
-
-            debug_assert!(res.is_ok());
-            return res;
-        }
-
-        Ok(())
-    }
-
-    /// Save the vertical scrollbar position.
-    pub(crate) fn save_alignment(&self) -> Result<(), Error> {
-        if let Ok(mut guard) = EPISODES_VIEW_VALIGNMENT.lock() {
-            let adj = self
-                .view
-                .scrolled_window()
-                .get_vadjustment()
-                .ok_or_else(|| format_err!("Could not get the adjustment"))?;
-            *guard = Some(Fragile::new(adj));
-            info!("Saved episodes_view alignment.");
-        }
-
-        Ok(())
+        home.view.container().show_all();
+        Ok(home)
     }
 }