Added layers to menus and fixed several bugs (and temporarily removed MythicCraft repos)

eco-api/src/main/java/com/willfp/eco/core/gui/menu/MenuBuilder.java

@@ -49,15 +49,32 @@ public interface MenuBuilder {
     /**
      * Add a component.
      *
+     * @param layer     The layer.
      * @param row       The row of the top left corner.
      * @param column    The column of the top left corner.
      * @param component The component.
      * @return The builder.
      */
-    MenuBuilder addComponent(int row,
+    MenuBuilder addComponent(@NotNull MenuLayer layer,
+                             int row,
                              int column,
                              @NotNull GUIComponent component);
 
+
+    /**
+     * Add a component.
+     *
+     * @param row       The row of the top left corner.
+     * @param column    The column of the top left corner.
+     * @param component The component.
+     * @return The builder.
+     */
+    default MenuBuilder addComponent(final int row,
+                                     final int column,
+                                     @NotNull final GUIComponent component) {
+        return this.addComponent(MenuLayer.BACKGROUND, row, column, component);
+    }
+
     /**
      * Run function to modify the builder.
      *
@@ -73,7 +90,7 @@ public interface MenuBuilder {
      * @return The builder.
      */
     default MenuBuilder setMask(@NotNull final FillerMask mask) {
-        return this.addComponent(0, 0, mask);
+        return this.addComponent(MenuLayer.BACKGROUND, 1, 1, mask);
     }
 
     /**
@@ -83,7 +100,7 @@ public interface MenuBuilder {
      * @return The builder.
      */
     default MenuBuilder addPage(@NotNull final Page page) {
-        return this.addComponent(0, 0, page);
+        return this.addComponent(MenuLayer.TOP, 1, 1, page);
     }
 
     /**

eco-api/src/main/java/com/willfp/eco/core/gui/menu/MenuLayer.java

@@ -0,0 +1,31 @@
+package com.willfp.eco.core.gui.menu;
+
+/**
+ * Different layers of the menu.
+ */
+public enum MenuLayer {
+    /**
+     * Right at the back.
+     */
+    BACKGROUND,
+
+    /**
+     * Second from the back.
+     */
+    LOWER,
+
+    /**
+     * In the middle (default).
+     */
+    MIDDLE,
+
+    /**
+     * Near the top.
+     */
+    UPPER,
+
+    /**
+     * At the absolute top.
+     */
+    TOP
+}

eco-api/src/main/java/com/willfp/eco/core/gui/page/PageChanger.java

@@ -59,11 +59,10 @@ public final class PageChanger implements GUIComponent {
     }
 
     @Override
-    public @Nullable
-    Slot getSlotAt(final int row,
-                   final int column,
-                   @NotNull final Player player,
-                   @NotNull final Menu menu) {
+    public @Nullable Slot getSlotAt(final int row,
+                                    final int column,
+                                    @NotNull final Player player,
+                                    @NotNull final Menu menu) {
         int page = Page.getPage(player, menu);
         int maxPage = Page.getMaxPage(player, menu);
 

eco-api/src/main/java/com/willfp/eco/core/gui/slot/FillerMask.java

@@ -129,6 +129,6 @@ public class FillerMask implements GUIComponent {
     @Override
     public @Nullable Slot getSlotAt(final int row,
                                     final int column) {
-        return mask.get(row).get(column);
+        return mask.get(row - 1).get(column - 1);
     }
 }