Init

src/page.rs

@@ -0,0 +1,38 @@
+#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
+pub enum Page {
+    #[default]
+    Main,
+    Patterns,
+    Audio,
+    Doc,
+}
+
+impl Page {
+    pub fn left(&mut self) {
+        *self = match self {
+            Page::Main | Page::Patterns => Page::Doc,
+            Page::Audio => Page::Main,
+            Page::Doc => Page::Audio,
+        }
+    }
+
+    pub fn right(&mut self) {
+        *self = match self {
+            Page::Main | Page::Patterns => Page::Audio,
+            Page::Audio => Page::Doc,
+            Page::Doc => Page::Main,
+        }
+    }
+
+    pub fn up(&mut self) {
+        if *self == Page::Main {
+            *self = Page::Patterns;
+        }
+    }
+
+    pub fn down(&mut self) {
+        if *self == Page::Patterns {
+            *self = Page::Main;
+        }
+    }
+}