[apps/code] Empty controller in the var box

apps/code/variable_box_empty_controller.h

@@ -0,0 +1,34 @@
+#ifndef APPS_CODE_VARIABLE_BOX_EMPTY_CONTROLLER_H
+#define APPS_CODE_VARIABLE_BOX_EMPTY_CONTROLLER_H
+
+#include <apps/variable_box_empty_controller.h>
+
+namespace Code {
+
+class VariableBoxEmptyController : public ::VariableBoxEmptyController {
+public:
+  VariableBoxEmptyController() :
+    ::VariableBoxEmptyController(),
+    m_view()
+  {}
+  // View Controller
+  View * view() override { return &m_view; }
+private:
+  class VariableBoxEmptyView : public ::VariableBoxEmptyController::VariableBoxEmptyView {
+  public:
+    constexpr static int k_numberOfMessages = 2;
+    VariableBoxEmptyView();
+  private:
+    int numberOfMessageTextViews() const override { return k_numberOfMessages; }
+    MessageTextView * messageTextViewAtIndex(int index) override {
+      assert(index >= 0 && index < k_numberOfMessages);
+      return &m_messages[index];
+    }
+    MessageTextView m_messages[k_numberOfMessages];
+  };
+  VariableBoxEmptyView m_view;
+};
+
+}
+
+#endif