feat: add canvas lock button

Memola/Canvas/View/Bridge/ViewController/CanvasViewController.swift

@@ -168,6 +168,12 @@ extension CanvasViewController {
             }
             .store(in: &cancellables)
 
+        canvas.$locksCanvas
+            .sink { [weak self] state in
+                self?.lockModeChanged(state)
+            }
+            .store(in: &cancellables)
+
         tool.$selectedPen
             .sink { [weak self] pen in
                 self?.penChanged(to: pen)
@@ -308,6 +314,11 @@ extension CanvasViewController {
     func zoomChanged(_ zoomScale: CGFloat) {
         scrollView.setZoomScale(zoomScale, animated: true)
     }
+
+    func lockModeChanged(_ state: Bool) {
+        scrollView.isScrollEnabled = !state
+        scrollView.pinchGestureRecognizer?.isEnabled = !state
+    }
 }
 
 extension CanvasViewController {