Fix Stuck Keys (#32)

* Update KeyContainer.swift

* Revert "Update KeyContainer.swift"

This reverts commit e17ccfd.

* Latching Toggle

Author: NickCulbertson

Sources/Keyboard/KeyContainer.swift

@@ -32,13 +32,15 @@ public struct KeyContainer<Content: View>: View {
 
     func rect(rect: CGRect) -> some View {
         content(pitch, model.touchedPitches.contains(pitch) || model.externallyActivatedPitches.contains(pitch))
-            .contentShape(Rectangle()) // Added to improve tap/click reliability
+            .contentShape(Rectangle())
             .gesture(
                 TapGesture().onEnded { _ in
-                    if model.externallyActivatedPitches.contains(pitch) {
-                        model.externallyActivatedPitches.remove(pitch)
-                    } else {
-                        model.externallyActivatedPitches.add(pitch)
+                    if model.latching {
+                        if model.externallyActivatedPitches.contains(pitch) {
+                            model.externallyActivatedPitches.remove(pitch)
+                        } else {
+                            model.externallyActivatedPitches.add(pitch)
+                        }
                     }
                 }
             )

Sources/Keyboard/Keyboard.swift

@@ -81,6 +81,7 @@ public struct Keyboard<Content>: View where Content: View {
         }.onAppear {
             model.noteOn = noteOn
             model.noteOff = noteOff
+            model.latching = latching
         }
     }
 }

Sources/Keyboard/KeyboardModel.swift

@@ -9,6 +9,7 @@ public class KeyboardModel: ObservableObject {
     var noteOn: (Pitch, CGPoint) -> Void = { _, _ in }
     var noteOff: (Pitch) -> Void = { _ in }
     var normalizedPoints = Array(repeating: CGPoint.zero, count: 128)
+    var latching: Bool = false
 
     var touchLocations: [CGPoint] = [] {
         didSet {