Feat: more predictable projet load behavior

crates/project/src/file.rs

@@ -25,6 +25,8 @@ struct ProjectFile {
     sample_paths: Vec<PathBuf>,
     #[serde(default = "default_tempo")]
     tempo: f64,
+    #[serde(default)]
+    playing_patterns: Vec<(usize, usize)>,
 }
 
 fn default_tempo() -> f64 {
@@ -38,6 +40,7 @@ impl From<&Project> for ProjectFile {
             banks: project.banks.clone(),
             sample_paths: project.sample_paths.clone(),
             tempo: project.tempo,
+            playing_patterns: project.playing_patterns.clone(),
         }
     }
 }
@@ -48,6 +51,7 @@ impl From<ProjectFile> for Project {
             banks: file.banks,
             sample_paths: file.sample_paths,
             tempo: file.tempo,
+            playing_patterns: file.playing_patterns,
         };
         project.normalize();
         project

crates/project/src/project.rs

@@ -450,6 +450,8 @@ pub struct Project {
     pub sample_paths: Vec<PathBuf>,
     #[serde(default = "default_tempo")]
     pub tempo: f64,
+    #[serde(default)]
+    pub playing_patterns: Vec<(usize, usize)>,
 }
 
 fn default_tempo() -> f64 {
@@ -462,6 +464,7 @@ impl Default for Project {
             banks: (0..MAX_BANKS).map(|_| Bank::default()).collect(),
             sample_paths: Vec::new(),
             tempo: default_tempo(),
+            playing_patterns: Vec::new(),
         }
     }
 }

src/app.rs

@@ -527,10 +527,15 @@ impl App {
         self.load_step_to_editor();
     }
 
-    pub fn save(&mut self, path: PathBuf, link: &LinkState) {
+    pub fn save(&mut self, path: PathBuf, link: &LinkState, snapshot: &SequencerSnapshot) {
         self.save_editor_to_step();
         self.project_state.project.sample_paths = self.audio.config.sample_paths.clone();
         self.project_state.project.tempo = link.tempo();
+        self.project_state.project.playing_patterns = snapshot
+            .active_patterns
+            .iter()
+            .map(|p| (p.bank, p.pattern))
+            .collect();
         match model::save(&self.project_state.project, &path) {
             Ok(final_path) => {
                 self.ui
@@ -547,12 +552,27 @@ impl App {
         match model::load(&path) {
             Ok(project) => {
                 let tempo = project.tempo;
+                let playing = project.playing_patterns.clone();
+
                 self.project_state.project = project;
                 self.editor_ctx.step = 0;
                 self.load_step_to_editor();
                 self.compile_all_steps(link);
                 self.mark_all_patterns_dirty();
                 link.set_tempo(tempo);
+
+                self.playback.clear_queues();
+                self.variables.lock().unwrap().clear();
+                self.dict.lock().unwrap().clear();
+
+                for (bank, pattern) in playing {
+                    self.playback.queued_changes.push(StagedChange {
+                        change: PatternChange::Start { bank, pattern },
+                        quantization: crate::model::LaunchQuantization::Immediate,
+                        sync_mode: crate::model::SyncMode::Reset,
+                    });
+                }
+
                 self.ui.set_status(format!("Loaded: {}", path.display()));
                 self.project_state.file_path = Some(path);
             }
@@ -1103,7 +1123,7 @@ impl App {
                 }
                 self.project_state.mark_dirty(bank, pattern);
             }
-            AppCommand::Save(path) => self.save(path, link),
+            AppCommand::Save(path) => self.save(path, link, snapshot),
             AppCommand::Load(path) => self.load(path, link),
 
             // UI

src/input.rs

@@ -258,6 +258,7 @@ fn handle_modal_input(ctx: &mut InputContext, key: KeyEvent) -> InputResult {
                     match mode {
                         FileBrowserMode::Save => ctx.dispatch(AppCommand::Save(path)),
                         FileBrowserMode::Load => {
+                            let _ = ctx.seq_cmd_tx.send(SeqCommand::StopAll);
                             ctx.dispatch(AppCommand::Load(path));
                             load_project_samples(ctx);
                         }

src/state/playback.rs

@@ -28,4 +28,9 @@ impl PlaybackState {
     pub fn toggle(&mut self) {
         self.playing = !self.playing;
     }
+
+    pub fn clear_queues(&mut self) {
+        self.staged_changes.clear();
+        self.queued_changes.clear();
+    }
 }