Changes

Added missing access modifiers.
Fixed a bug in PagedGUI that could result in showing an empty page.

src/main/java/de/studiocode/invgui/gui/impl/PagedGUI.java

@@ -63,12 +63,19 @@ public abstract class PagedGUI extends BaseGUI {
     }
     
     private void updatePageContent() {
+        if (getCurrentPage() < getPageAmount()) {
             List<SlotElement> slotElements = getPageItems(currentPage);
     
             for (int i = 0; i < itemListSlots.length; i++) {
                 if (slotElements.size() > i) setSlotElement(itemListSlots[i], slotElements.get(i));
                 else remove(itemListSlots[i]);
             }
+        } else setCurrentPage(getPageAmount() - 1);
+    }
+    
+    private void setCurrentPage(int page) {
+        currentPage = page;
+        update();
     }
     
     public int getCurrentPage() {
@@ -91,7 +98,7 @@ public abstract class PagedGUI extends BaseGUI {
         return itemListSlots;
     }
     
-    abstract int getPageAmount();
+    protected abstract int getPageAmount();
     
     abstract List<SlotElement> getPageItems(int page);
     

src/main/java/de/studiocode/invgui/gui/impl/SimplePagedGUIs.java

@@ -23,12 +23,12 @@ public class SimplePagedGUIs extends PagedGUI {
     }
     
     @Override
-    int getPageAmount() {
+    protected int getPageAmount() {
         return guis.size();
     }
     
     @Override
-    List<SlotElement> getPageItems(int page) {
+    protected List<SlotElement> getPageItems(int page) {
         return Arrays.asList(guis.get(page).getSlotElements());
     }
     

src/main/java/de/studiocode/invgui/gui/impl/SimplePagedItemsGUI.java

@@ -27,7 +27,7 @@ public class SimplePagedItemsGUI extends PagedGUI {
     }
     
     @Override
-    List<SlotElement> getPageItems(int page) {
+    protected List<SlotElement> getPageItems(int page) {
         int length = getItemListSlots().length;
         int from = page * length;
         int to = Math.min(from + length, items.size());