refactor: contains_note_on

src/device/sequencer/phrase.rs

@@ -16,7 +16,23 @@ impl Phrase {
     pub fn new (name: &str, length: usize, notes: Option<PhraseData>) -> Self {
         Self { name: name.to_string(), length, notes: notes.unwrap_or(BTreeMap::new()) }
     }
-    /** Write a chunk of MIDI events to an output port. */
+    /// Check if a range `start..end` contains MIDI Note On `k`
+    pub fn contains_note_on (&self, k: u7, start: usize, end: usize) -> bool {
+        for (_, (_, events)) in self.notes.range(start..end).enumerate() {
+            for event in events.iter() {
+                match event {
+                    MidiMessage::NoteOn {key,..} => {
+                        if *key == k {
+                            return true
+                        }
+                    }
+                    _ => {}
+                }
+            }
+        }
+        return false
+    }
+    /// Write a chunk of MIDI events to an output port.
     pub fn process_out (
         &self,
         output:   &mut MIDIChunk,
@@ -55,7 +71,7 @@ impl Phrase {
             }
         }
     }
-    /** Read a chunk of MIDI events from an input port. */
+    /// Read a chunk of MIDI events from an input port.
     pub fn process_in (
         &mut self,
         input:       ::jack::MidiIter,