extract Sequencer model

src/model/sequencer.rs

@@ -0,0 +1,46 @@
+use crate::{core::*, model::Phrase};
+
+pub struct Sequencer {
+    pub phrase:      Option<Arc<RwLock<Phrase>>>,
+    pub mode:        bool,
+    pub buffer:      Buffer,
+    pub now:         usize,
+    pub ppq:         usize,
+    pub note_cursor: usize,
+    pub note_start:  usize,
+    pub time_cursor: usize,
+    pub time_start:  usize,
+    pub time_zoom:   usize,
+
+    pub focused: bool,
+    pub entered: bool,
+
+    /// Highlight input keys
+    pub notes_in:  [bool; 128],
+    /// Highlight output keys
+    pub notes_out: [bool; 128],
+}
+
+impl Sequencer {
+    pub fn new () -> Self {
+        Self {
+            buffer: Buffer::empty(Rect::default()),
+            entered: false,
+            focused: false,
+            mode: false,
+            note_cursor: 0,
+            note_start: 0,
+            notes_in: [false;128],
+            notes_out: [false;128],
+            phrase: None,
+            time_cursor: 0,
+            time_start: 0,
+            time_zoom: 12,
+            now: 0,
+            ppq: 96
+        }
+    }
+    pub fn show (&mut self, phrase: Option<&Arc<RwLock<Phrase>>>) {
+        self.phrase = phrase.map(Clone::clone);
+    }
+}