Added some advanced menu item features

src/marginmenuitem.h

@@ -0,0 +1,20 @@
+#pragma once
+
+// local includes
+#include "actioninterface.h"
+#include "menuitem.h"
+#include "textinterface.h"
+#include "scrollinterface.h"
+
+namespace espgui {
+class MarginMenuItem :
+        public virtual MenuItem,
+        public EmptyText,
+        public virtual ActionInterface,
+        public virtual ScrollInterface
+{
+public:
+    void triggered() override {}
+    bool skipScroll() const override { return true; }
+};
+} // namespace espgui

src/menudisplay.cpp

@@ -68,6 +68,18 @@ void MenuDisplay::update()
         runForEveryMenuItem([&](MenuItem &item){
             item.update();
         });
+
+        if (getMenuItem(m_selectedIndex).skipScroll())
+        {
+            if (offset > 0)
+            {
+                m_rotateOffset++;
+            }
+            else if (offset < 0)
+            {
+                m_rotateOffset--;
+            }
+        }
     }
     else
     {
@@ -103,6 +115,11 @@ void MenuDisplay::redraw()
     runForEveryMenuItem([&](MenuItem &item){
         const auto index = i++;
 
+        if (!item.visible())
+        {
+            return;
+        }
+
         if (index < m_scrollOffset)
             return;
 

src/menuitem.h

@@ -6,6 +6,8 @@
 #include "colorinterface.h"
 #include "iconinterface.h"
 #include "actioninterface.h"
+#include "visibleinterface.h"
+#include "scrollinterface.h"
 
 namespace espgui {
 using MenuItemIconInterface = IconInterface<24, 24>;
@@ -20,7 +22,9 @@ class MenuItem :
     public virtual TextInterface,
     public virtual FontInterface,
     public virtual ColorInterface,
-    public virtual MenuItemIconInterface
+    public virtual MenuItemIconInterface,
+    public virtual VisibleInterface,
+    public virtual ScrollInterface
 {
 public:
     virtual ~MenuItem() = default;
@@ -38,4 +42,13 @@ public:
 protected:
     T &m_menu;
 };
+
+class EmptyMenuItem :
+        public MenuItem,
+        public EmptyText,
+        public virtual ActionInterface
+{
+public:
+    void triggered() override {}
+};
 } // namespace espgui

src/scrollinterface.h

@@ -0,0 +1,14 @@
+#pragma once
+
+namespace espgui {
+class ScrollInterface {
+public:
+    virtual bool skipScroll() const { return false; }
+};
+
+template<bool TScroll>
+class StaticScrollBehaviour : public ScrollInterface {
+public:
+    bool skipScroll() const override { return TScroll; }
+};
+} // namespace espgui

src/visibleinterface.h

@@ -0,0 +1,24 @@
+#pragma once
+
+namespace espgui {
+class VisibleInterface {
+public:
+    virtual bool visible() const { return true; }
+};
+
+template<bool TVisible>
+class StaticVisibility : public virtual VisibleInterface
+{
+public:
+    bool visible() const override { return TVisible; }
+};
+
+class ChangeableVisibility : public virtual VisibleInterface
+{
+public:
+    void setVisible(bool visible) { m_visible = visible; }
+    bool visible() const override { return m_visible; }
+private:
+    bool m_visible = true;
+};
+} // namespace espgui