Implemented Panels API - still need some work, but it is functionnal

src/main/java/us/tastybento/bskyblock/BSkyBlock.java

@@ -22,6 +22,7 @@ import us.tastybento.bskyblock.database.managers.island.IslandsManager;
 import us.tastybento.bskyblock.generators.IslandWorld;
 import us.tastybento.bskyblock.listeners.JoinLeaveListener;
 import us.tastybento.bskyblock.listeners.NetherPortals;
+import us.tastybento.bskyblock.listeners.PanelListener;
 import us.tastybento.bskyblock.listeners.protection.IslandGuard;
 import us.tastybento.bskyblock.listeners.protection.IslandGuard1_8;
 import us.tastybento.bskyblock.listeners.protection.IslandGuard1_9;
@@ -34,7 +35,7 @@ import us.tastybento.bskyblock.util.VaultHelper;
  * @author Tastybento
  * @author Poslovitch
  */
-public class BSkyBlock extends JavaPlugin{
+public class BSkyBlock extends JavaPlugin {
 
     private static BSkyBlock plugin;
 
@@ -168,6 +169,7 @@ public class BSkyBlock extends JavaPlugin{
         manager.registerEvents(new IslandGuard(this), this);
         manager.registerEvents(new IslandGuard1_8(this), this);
         manager.registerEvents(new IslandGuard1_9(this), this);
+        manager.registerEvents(new PanelListener(this), this);
     }
 
     @Override

src/main/java/us/tastybento/bskyblock/api/panels/ClickType.java

@@ -0,0 +1,6 @@
+package us.tastybento.bskyblock.api.panels;
+
+public enum ClickType {
+    RIGHT,
+    LEFT
+}

src/main/java/us/tastybento/bskyblock/api/panels/Panel.java

@@ -0,0 +1,47 @@
+package us.tastybento.bskyblock.api.panels;
+
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.Inventory;
+import us.tastybento.bskyblock.listeners.PanelListener;
+
+import java.util.Map;
+
+public class Panel {
+
+    private Inventory inventory;
+    private Map<Integer, PanelItem> items;
+
+    public Panel(String name, Map<Integer, PanelItem> items) {
+        this.items = items;
+
+        // Create panel
+        if (items.keySet().size() > 0) {
+            // Make sure size is a multiple of 9
+            int size = items.keySet().size() + 8;
+            size -= (size % 9);
+            inventory = Bukkit.createInventory(null, size, name);
+            // Fill the inventory and return
+            for (Map.Entry<Integer, PanelItem> en: items.entrySet()) {
+                inventory.setItem(en.getKey(), en.getValue().getItem());
+            }
+        } else {
+            inventory = Bukkit.createInventory(null, 9, name);
+        }
+    }
+
+    public Inventory getInventory() {
+        return inventory;
+    }
+
+    public Map<Integer, PanelItem> getItems() {
+        return items;
+    }
+
+    public void open(Player... players) {
+        for (Player player : players) {
+            player.openInventory(inventory);
+            PanelListener.openPanels.put(player.getUniqueId(), this);
+        }
+    }
+}

src/main/java/us/tastybento/bskyblock/api/panels/PanelItem.java

@@ -0,0 +1,60 @@
+package us.tastybento.bskyblock.api.panels;
+
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemFlag;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+
+import java.util.Arrays;
+
+public class PanelItem {
+
+    private ItemStack item;
+    private ClickHandler clickHandler;
+
+    public PanelItem(ItemStack icon, String name, String description, boolean glow, ClickHandler clickHandler) {
+        // Create the final item
+        ItemMeta meta = icon.getItemMeta();
+        meta.setDisplayName(name);
+        meta.setLore(Arrays.asList(description.split("\\n"))); // the \n is automatically generated by the YAML when getting a multi-line value.
+
+        // Set flags to neaten up the view
+        meta.addItemFlags(ItemFlag.HIDE_ATTRIBUTES);
+        meta.addItemFlags(ItemFlag.HIDE_DESTROYS);
+        meta.addItemFlags(ItemFlag.HIDE_PLACED_ON);
+        meta.addItemFlags(ItemFlag.HIDE_ENCHANTS);
+
+        if (glow) {
+            meta.addEnchant(Enchantment.ARROW_DAMAGE, 0, true);
+        }
+
+        icon.setItemMeta(meta);
+
+        // Assign the values
+        this.item = icon;
+        this.clickHandler = clickHandler;
+
+        // if clickHandler is null, set a default one which will prevent picking up the item from the Panel
+        if (this.clickHandler == null) {
+            this.clickHandler = new ClickHandler() {
+                @Override
+                public boolean onClick(Player player, ClickType click) {
+                    return false;
+                }
+            };
+        }
+    }
+
+    public ItemStack getItem() {
+        return item;
+    }
+
+    public ClickHandler getClickHandler() {
+        return clickHandler;
+    }
+
+    public interface ClickHandler {
+        boolean onClick(Player player, ClickType click);
+    }
+}

src/main/java/us/tastybento/bskyblock/api/panels/builders/PanelBuilder.java

@@ -0,0 +1,26 @@
+package us.tastybento.bskyblock.api.panels.builders;
+
+import us.tastybento.bskyblock.api.panels.Panel;
+import us.tastybento.bskyblock.api.panels.PanelItem;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class PanelBuilder {
+    private String name;
+    private Map<Integer, PanelItem> items = new HashMap<>();
+
+    public PanelBuilder setName(String name) {
+        this.name = name;
+        return this;
+    }
+
+    public PanelBuilder addItem(int slot, PanelItem item) {
+        this.items.put(slot, item);
+        return this;
+    }
+
+    public Panel build() {
+        return new Panel(name, items);
+    }
+}

src/main/java/us/tastybento/bskyblock/api/panels/builders/PanelItemBuilder.java

@@ -0,0 +1,41 @@
+package us.tastybento.bskyblock.api.panels.builders;
+
+import org.bukkit.inventory.ItemStack;
+import us.tastybento.bskyblock.api.panels.PanelItem;
+
+public class PanelItemBuilder {
+    private ItemStack icon;
+    private String name;
+    private String description;
+    private boolean glow;
+    private PanelItem.ClickHandler clickHandler;
+
+    public PanelItemBuilder setIcon(ItemStack icon) {
+        this.icon = icon;
+        return this;
+    }
+
+    public PanelItemBuilder setName(String name) {
+         this.name = name;
+         return this;
+    }
+
+    public PanelItemBuilder setDescription(String description) {
+        this.description = description;
+        return this;
+    }
+
+    public PanelItemBuilder setGlow(boolean glow) {
+        this.glow = glow;
+        return this;
+    }
+
+    public PanelItemBuilder setClickHandler(PanelItem.ClickHandler clickHandler) {
+        this.clickHandler = clickHandler;
+        return this;
+    }
+
+    public PanelItem build() {
+        return new PanelItem(icon, name, description, glow, clickHandler);
+    }
+}

src/main/java/us/tastybento/bskyblock/listeners/PanelListener.java

@@ -0,0 +1,62 @@
+package us.tastybento.bskyblock.listeners;
+
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.event.inventory.InventoryCloseEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
+import us.tastybento.bskyblock.BSkyBlock;
+import us.tastybento.bskyblock.api.panels.ClickType;
+import us.tastybento.bskyblock.api.panels.Panel;
+import us.tastybento.bskyblock.api.panels.PanelItem;
+
+import java.util.HashMap;
+import java.util.UUID;
+
+public class PanelListener implements Listener {
+
+    private static final boolean DEBUG = false;
+    private BSkyBlock plugin;
+
+    public static HashMap<UUID, Panel> openPanels = new HashMap<>();
+
+    public PanelListener(BSkyBlock plugin) {
+        this.plugin = plugin;
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST)
+    public void onInventoryClick(InventoryClickEvent event) {
+        Player player = (Player) event.getWhoClicked(); // The player that
+        // clicked the item
+        //UUID playerUUID = player.getUniqueId();
+        Inventory inventory = event.getInventory(); // The inventory that was
+
+        if (openPanels.containsKey(player.getUniqueId())) {
+            if (inventory.getName().equals(openPanels.get(player.getUniqueId()).getInventory().getName())) {
+                Panel panel = openPanels.get(player.getUniqueId());
+
+                for (int slot : panel.getItems().keySet()) {
+                    if (slot == event.getRawSlot()) {
+                        if(!panel.getItems().get(slot).getClickHandler().onClick(player, ClickType.LEFT)) {
+                            event.setCancelled(true);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST)
+    public void onInventoryClose(InventoryCloseEvent event) {
+        if (openPanels.containsKey(event.getPlayer().getUniqueId())) openPanels.remove(event.getPlayer().getUniqueId());
+    }
+
+    @EventHandler(priority = EventPriority.NORMAL)
+    public void onLogOut(PlayerQuitEvent event) {
+        if (openPanels.containsKey(event.getPlayer().getUniqueId())) openPanels.remove(event.getPlayer().getUniqueId());
+    }
+}