Add search button to the CommonPagedPanel.

Search button will allow to search elements if there are more than displayed elements.

src/main/java/world/bentobox/challenges/panel/CommonPagedPanel.java

@@ -14,7 +14,7 @@ import org.eclipse.jdt.annotation.NonNull;
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.function.Function;
+import java.util.function.Consumer;
 
 import world.bentobox.bentobox.api.panels.PanelItem;
 import world.bentobox.bentobox.api.panels.builders.PanelBuilder;
@@ -27,7 +27,7 @@ import world.bentobox.challenges.utils.Constants;
 /**
  * This panel implements common things for Paged pages.
  */
-public abstract class CommonPagedPanel extends CommonPanel
+public abstract class CommonPagedPanel<T> extends CommonPanel
 {
     /**
      * Instantiates a new Common paged panel.
@@ -57,16 +57,28 @@ public abstract class CommonPagedPanel extends CommonPanel
     }
 
 
+    /**
+     * This method is called when filter value is updated.
+     */
+    protected abstract void updateFilters();
+
+
+    /**
+     * Create element button panel item.
+     *
+     * @param object the object
+     * @return the panel item
+     */
+    protected abstract PanelItem createElementButton(T object);
+
+
     /**
      * Populate elements.
      *
      * @param panelBuilder the panel builder
      * @param objectList the object list
-     * @param buttonBuilder the button builder
      */
-    protected void populateElements(PanelBuilder panelBuilder,
+    protected void populateElements(PanelBuilder panelBuilder, List<T> objectList)
-        List<?> objectList,
-        Function<Object, PanelItem> buttonBuilder)
     {
         final int MAX_ELEMENTS = 21;
         final int size = objectList.size();
@@ -91,7 +103,7 @@ public abstract class CommonPagedPanel extends CommonPanel
         {
             if (!panelBuilder.slotOccupied(index))
             {
-                panelBuilder.item(index, buttonBuilder.apply(objectList.get(objectIndex++)));
+                panelBuilder.item(index, this.createElementButton(objectList.get(objectIndex++)));
             }
 
             index++;
@@ -107,6 +119,13 @@ public abstract class CommonPagedPanel extends CommonPanel
         {
             panelBuilder.item(18, this.getButton(CommonButtons.PREVIOUS));
         }
+
+        // Add search button only if there is more than MAX_ELEMENTS objects or searchString
+        // is not blank.
+        if (!this.searchString.isBlank() || objectList.size() > MAX_ELEMENTS)
+        {
+            panelBuilder.item(40, this.getButton(CommonButtons.SEARCH));
+        }
     }
 
 
@@ -157,6 +176,59 @@ public abstract class CommonPagedPanel extends CommonPanel
                 return true;
             };
         }
+        else if (button == CommonButtons.SEARCH)
+        {
+            description.add(this.user.getTranslation(reference + "description"));
+
+            if (this.searchString != null && !this.searchString.isEmpty())
+            {
+                description.add(this.user.getTranslation(reference + "search",
+                    Constants.PARAMETER_VALUE, this.searchString));
+            }
+
+            description.add("");
+            description.add(this.user.getTranslation(Constants.TIPS + "left-click-to-edit"));
+
+            if (!this.searchString.isEmpty())
+            {
+                description.add(this.user.getTranslation(Constants.TIPS + "right-click-to-clear"));
+            }
+
+            icon = new ItemStack(Material.ANVIL);
+
+            clickHandler = (panel, user, clickType, slot) -> {
+                if (clickType.isRightClick())
+                {
+                    // Clear string.
+                    this.searchString = "";
+                    this.updateFilters();
+                    // Rebuild gui.
+                    this.build();
+                }
+                else
+                {
+                    // Create consumer that process description change
+                    Consumer<String> consumer = value ->
+                    {
+                        if (value != null)
+                        {
+                            this.searchString = value;
+                            this.updateFilters();
+                        }
+
+                        this.build();
+                    };
+
+                    // start conversation
+                    ConversationUtils.createStringInput(consumer,
+                        user,
+                        user.getTranslation(Constants.CONVERSATIONS + "write-search"),
+                        user.getTranslation(Constants.CONVERSATIONS + "search-updated"));
+                }
+
+                return true;
+            };
+        }
         else
         {
             icon = new ItemStack(Material.PAPER);
@@ -178,7 +250,8 @@ public abstract class CommonPagedPanel extends CommonPanel
     private enum CommonButtons
     {
         NEXT,
-        PREVIOUS
+        PREVIOUS,
+        SEARCH
     }
 
 
@@ -186,4 +259,9 @@ public abstract class CommonPagedPanel extends CommonPanel
      * Current page index.
      */
     private int pageIndex;
+
+    /**
+     * Text that contains filter string.
+     */
+    protected String searchString = "";
 }

src/main/java/world/bentobox/challenges/panel/admin/EditLevelPanel.java

@@ -34,7 +34,7 @@ import world.bentobox.challenges.utils.Utils;
 /**
  * This class contains all necessary elements to create Levels Edit GUI.
  */
-public class EditLevelPanel extends CommonPagedPanel
+public class EditLevelPanel extends CommonPagedPanel<Challenge>
 {
     // ---------------------------------------------------------------------
     // Section: Constructors
@@ -111,6 +111,16 @@ public class EditLevelPanel extends CommonPagedPanel
     // ---------------------------------------------------------------------
 
 
+    /**
+     * This method is called when filter value is updated.
+     */
+    @Override
+    protected void updateFilters()
+    {
+        // Do nothing here.
+    }
+
+
     /**
      * This method builds all necessary elements in GUI panel.
      */
@@ -190,11 +200,15 @@ public class EditLevelPanel extends CommonPagedPanel
      */
     private void buildChallengesPanel(PanelBuilder panelBuilder)
     {
-        List<Challenge> challengeList = this.addon.getChallengesManager().getLevelChallenges(this.challengeLevel);
+        List<Challenge> challengeList = this.addon.getChallengesManager().
+            getLevelChallenges(this.challengeLevel).stream().
+            filter(challenge -> this.searchString.isBlank() ||
+                challenge.getFriendlyName().toLowerCase().contains(this.searchString.toLowerCase()) ||
+                challenge.getUniqueId().toLowerCase().contains(this.searchString.toLowerCase()) ||
+                challenge.getChallengeType().name().toLowerCase().contains(this.searchString)).
+            collect(Collectors.toList());
 
-        this.populateElements(panelBuilder,
+        this.populateElements(panelBuilder, challengeList);
-            challengeList,
-            o -> this.createChallengeIcon((Challenge) o));
 
         panelBuilder.item(39, this.createButton(Button.ADD_CHALLENGES));
         panelBuilder.item(41, this.createButton(Button.REMOVE_CHALLENGES));
@@ -279,7 +293,8 @@ public class EditLevelPanel extends CommonPagedPanel
      * @param challenge Challenge which icon must be created.
      * @return PanelItem that represents given challenge.
      */
-    private PanelItem createChallengeIcon(Challenge challenge)
+    @Override
+    protected PanelItem createElementButton(Challenge challenge)
     {
         return new PanelItemBuilder().
             name(Util.translateColorCodes(challenge.getFriendlyName())).

src/main/java/world/bentobox/challenges/panel/admin/LibraryPanel.java

@@ -33,7 +33,7 @@ import world.bentobox.challenges.web.object.LibraryEntry;
  * This class contains all necessary elements to create GUI that lists all challenges.
  * It allows to edit them or remove, depending on given input mode.
  */
-public class LibraryPanel extends CommonPagedPanel
+public class LibraryPanel extends CommonPagedPanel<LibraryEntry>
 {
     // ---------------------------------------------------------------------
     // Section: Constructor
@@ -54,6 +54,8 @@ public class LibraryPanel extends CommonPagedPanel
             case DATABASE -> this.generateDatabaseEntries();
             case TEMPLATE -> this.generateTemplateEntries();
         };
+
+        this.filterElements = this.libraryEntries;
     }
 
 
@@ -130,6 +132,32 @@ public class LibraryPanel extends CommonPagedPanel
 // ---------------------------------------------------------------------
 
 
+    /**
+     * This method is called when filter value is updated.
+     */
+    @Override
+    protected void updateFilters()
+    {
+        if (this.searchString == null || this.searchString.isBlank())
+        {
+            this.filterElements = this.libraryEntries;
+        }
+        else
+        {
+            this.filterElements = this.libraryEntries.stream().
+                filter(element -> {
+                    // If element name is set and name contains search field, then do not filter out.
+                    return element.name().toLowerCase().contains(this.searchString.toLowerCase()) ||
+                        element.author().toLowerCase().contains(this.searchString.toLowerCase()) ||
+                        element.gameMode().toLowerCase().contains(this.searchString.toLowerCase()) ||
+                        element.language().toLowerCase().contains(this.searchString.toLowerCase());
+                }).
+                distinct().
+                collect(Collectors.toList());
+        }
+    }
+
+
     /**
      * {@inheritDoc}
      */
@@ -156,9 +184,7 @@ public class LibraryPanel extends CommonPagedPanel
 
         GuiUtils.fillBorder(panelBuilder);
 
-        this.populateElements(panelBuilder,
+        this.populateElements(panelBuilder, this.filterElements);
-            this.libraryEntries,
-            o -> this.createEntryIcon((LibraryEntry) o));
 
         if (this.mode == Library.WEB)
         {
@@ -232,7 +258,8 @@ public class LibraryPanel extends CommonPagedPanel
      * @param libraryEntry LibraryEntry which button must be created.
      * @return Entry button.
      */
-    private PanelItem createEntryIcon(LibraryEntry libraryEntry)
+    @Override
+    protected PanelItem createElementButton(LibraryEntry libraryEntry)
     {
         PanelItemBuilder itemBuilder = new PanelItemBuilder().
             name(ChatColor.translateAlternateColorCodes('&', libraryEntry.name())).
@@ -436,4 +463,9 @@ public class LibraryPanel extends CommonPagedPanel
      * List of library elements.
      */
     private final List<LibraryEntry> libraryEntries;
+
+    /**
+     * Stores filtered items.
+     */
+    private List<LibraryEntry> filterElements;
 }

src/main/java/world/bentobox/challenges/panel/admin/ListChallengesPanel.java

@@ -1,7 +1,9 @@
 package world.bentobox.challenges.panel.admin;
 
 
+import java.util.List;
 import java.util.function.Consumer;
+import java.util.stream.Collectors;
 
 import org.bukkit.Material;
 import org.bukkit.World;
@@ -25,7 +27,7 @@ import world.bentobox.challenges.utils.Utils;
  * This class contains all necessary elements to create GUI that lists all challenges.
  * It allows to edit them or remove, depending on given input mode.
  */
-public class ListChallengesPanel extends CommonPagedPanel
+public class ListChallengesPanel extends CommonPagedPanel<Challenge>
 {
     // ---------------------------------------------------------------------
     // Section: Constructor
@@ -96,6 +98,16 @@ public class ListChallengesPanel extends CommonPagedPanel
     // ---------------------------------------------------------------------
 
 
+    /**
+     * This method is called when filter value is updated.
+     */
+    @Override
+    protected void updateFilters()
+    {
+        // Do nothing here.
+    }
+
+
     /**
      * {@inheritDoc}
      */
@@ -114,9 +126,15 @@ public class ListChallengesPanel extends CommonPagedPanel
             GuiUtils.fillBorder(panelBuilder);
         }
 
-        this.populateElements(panelBuilder,
+        List<Challenge> challengeList = this.addon.getChallengesManager().getAllChallenges(this.world).
-            this.addon.getChallengesManager().getAllChallenges(this.world),
+            stream().
-            o -> this.createChallengeIcon((Challenge) o));
+            filter(challenge -> this.searchString.isBlank() ||
+                challenge.getFriendlyName().toLowerCase().contains(this.searchString.toLowerCase()) ||
+                challenge.getUniqueId().toLowerCase().contains(this.searchString.toLowerCase()) ||
+                challenge.getChallengeType().name().toLowerCase().contains(this.searchString)).
+            collect(Collectors.toList());
+
+        this.populateElements(panelBuilder, challengeList);
 
         panelBuilder.item(44, this.returnButton);
 
@@ -129,7 +147,8 @@ public class ListChallengesPanel extends CommonPagedPanel
      * @param challenge Challenge which button must be created.
      * @return Challenge button.
      */
-    private PanelItem createChallengeIcon(Challenge challenge)
+    @Override
+    protected PanelItem createElementButton(Challenge challenge)
     {
         PanelItemBuilder itemBuilder = new PanelItemBuilder().
             name(Util.translateColorCodes(challenge.getFriendlyName())).

src/main/java/world/bentobox/challenges/panel/admin/ListLevelsPanel.java

@@ -4,7 +4,9 @@ package world.bentobox.challenges.panel.admin;
 import org.bukkit.Material;
 import org.bukkit.World;
 
+import java.util.List;
 import java.util.function.Consumer;
+import java.util.stream.Collectors;
 
 import world.bentobox.bentobox.api.panels.PanelItem;
 import world.bentobox.bentobox.api.panels.builders.PanelBuilder;
@@ -12,6 +14,7 @@ import world.bentobox.bentobox.api.panels.builders.PanelItemBuilder;
 import world.bentobox.bentobox.api.user.User;
 import world.bentobox.bentobox.util.Util;
 import world.bentobox.challenges.ChallengesAddon;
+import world.bentobox.challenges.database.object.Challenge;
 import world.bentobox.challenges.database.object.ChallengeLevel;
 import world.bentobox.challenges.panel.CommonPagedPanel;
 import world.bentobox.challenges.panel.CommonPanel;
@@ -25,7 +28,7 @@ import world.bentobox.challenges.utils.Utils;
  * This class creates GUI that lists all Levels. Clicking on Level icon will be processed
  * by input mode.
  */
-public class ListLevelsPanel extends CommonPagedPanel
+public class ListLevelsPanel extends CommonPagedPanel<ChallengeLevel>
 {
     // ---------------------------------------------------------------------
     // Section: Constructor
@@ -96,6 +99,16 @@ public class ListLevelsPanel extends CommonPagedPanel
     // ---------------------------------------------------------------------
 
 
+    /**
+     * This method is called when filter value is updated.
+     */
+    @Override
+    protected void updateFilters()
+    {
+        // Do nothing here.
+    }
+
+
     /**
      * {@inheritDoc}
      */
@@ -114,9 +127,14 @@ public class ListLevelsPanel extends CommonPagedPanel
             GuiUtils.fillBorder(panelBuilder);
         }
 
-        this.populateElements(panelBuilder,
+        List<ChallengeLevel> levelList = this.addon.getChallengesManager().getLevels(this.world).
-            this.addon.getChallengesManager().getLevels(this.world),
+            stream().
-            o -> this.createLevelIcon((ChallengeLevel) o));
+            filter(challenge -> this.searchString.isBlank() ||
+                challenge.getFriendlyName().toLowerCase().contains(this.searchString.toLowerCase()) ||
+                challenge.getUniqueId().toLowerCase().contains(this.searchString.toLowerCase())).
+            collect(Collectors.toList());
+
+        this.populateElements(panelBuilder, levelList);
 
         panelBuilder.item(44, this.returnButton);
 
@@ -129,7 +147,8 @@ public class ListLevelsPanel extends CommonPagedPanel
      * @param challengeLevel Level which button must be created.
      * @return Level button.
      */
-    private PanelItem createLevelIcon(ChallengeLevel challengeLevel)
+    @Override
+    protected PanelItem createElementButton(ChallengeLevel challengeLevel)
     {
         PanelItemBuilder itemBuilder = new PanelItemBuilder().
             name(Util.translateColorCodes(challengeLevel.getFriendlyName())).

src/main/java/world/bentobox/challenges/panel/admin/ListUsersPanel.java

@@ -31,7 +31,7 @@ import world.bentobox.challenges.utils.Utils;
 /**
  * This class contains methods that allows to select specific user.
  */
-public class ListUsersPanel extends CommonPagedPanel
+public class ListUsersPanel extends CommonPagedPanel<Player>
 {
     // ---------------------------------------------------------------------
     // Section: Constructors
@@ -56,6 +56,7 @@ public class ListUsersPanel extends CommonPagedPanel
         super(addon, user, world, topLabel, permissionPrefix);
         this.onlineUsers = this.collectUsers(ViewMode.IN_WORLD);
         this.operationMode = operationMode;
+        this.filterElements = this.onlineUsers;
     }
 
 
@@ -67,6 +68,7 @@ public class ListUsersPanel extends CommonPagedPanel
         super(panel);
         this.onlineUsers = this.collectUsers(ViewMode.IN_WORLD);
         this.operationMode = operationMode;
+        this.filterElements = this.onlineUsers;
     }
 
 
@@ -104,6 +106,29 @@ public class ListUsersPanel extends CommonPagedPanel
     // ---------------------------------------------------------------------
 
 
+    /**
+     * This method is called when filter value is updated.
+     */
+    @Override
+    protected void updateFilters()
+    {
+        if (this.searchString == null || this.searchString.isBlank())
+        {
+            this.filterElements = this.onlineUsers;
+        }
+        else
+        {
+            this.filterElements = this.onlineUsers.stream().
+                filter(element -> {
+                    // If element name is set and name contains search field, then do not filter out.
+                    return element.getDisplayName().toLowerCase().contains(this.searchString.toLowerCase());
+                }).
+                distinct().
+                collect(Collectors.toList());
+        }
+    }
+
+
     @Override
     protected void build()
     {
@@ -112,9 +137,7 @@ public class ListUsersPanel extends CommonPagedPanel
 
         GuiUtils.fillBorder(panelBuilder);
 
-        this.populateElements(panelBuilder,
+        this.populateElements(panelBuilder, this.filterElements);
-            this.onlineUsers,
-            o -> this.createPlayerIcon((Player) o));
 
         // Add button that allows to toggle different player lists.
         panelBuilder.item( 4, this.createToggleButton());
@@ -129,7 +152,8 @@ public class ListUsersPanel extends CommonPagedPanel
      * @param player Player which button must be created.
      * @return Player button.
      */
-    private PanelItem createPlayerIcon(Player player)
+    @Override
+    protected PanelItem createElementButton(Player player)
     {
         final String reference = Constants.BUTTON + "player.";
 
@@ -318,6 +342,10 @@ public class ListUsersPanel extends CommonPagedPanel
                     this.onlineUsers = this.collectUsers(this.mode);
                 }
 
+                // Reset search
+                this.searchString = "";
+                this.updateFilters();
+
                 this.build();
                 return true;
             }).build();
@@ -359,6 +387,11 @@ public class ListUsersPanel extends CommonPagedPanel
      */
     private List<Player> onlineUsers;
 
+    /**
+     * List with players that should be in GUI.
+     */
+    private List<Player> filterElements;
+
     /**
      * Current operation mode.
      */

src/main/java/world/bentobox/challenges/panel/admin/ManageBlocksPanel.java

@@ -8,6 +8,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.function.Consumer;
+import java.util.stream.Collectors;
 
 import org.bukkit.Material;
 import org.bukkit.inventory.ItemStack;
@@ -27,7 +28,7 @@ import world.bentobox.challenges.utils.Utils;
 /**
  * This class allows to edit material that are in required material map.
  */
-public class ManageBlocksPanel extends CommonPagedPanel
+public class ManageBlocksPanel extends CommonPagedPanel<Material>
 {
 	private ManageBlocksPanel(CommonPanel parentGUI, Map<Material, Integer> materialMap)
 	{
@@ -36,9 +37,12 @@ public class ManageBlocksPanel extends CommonPagedPanel
 		this.materialList = new ArrayList<>(this.materialMap.keySet());
 
 		// Sort materials by their ordinal value.
-		this.materialList.sort(Comparator.comparing(Enum::ordinal));
+		this.materialList.sort(Comparator.comparing(Enum::name));
 
 		this.selectedMaterials = new HashSet<>();
+
+		// Init without filters applied.
+		this.filterElements = this.materialList;
 	}
 
 
@@ -56,11 +60,34 @@ public class ManageBlocksPanel extends CommonPagedPanel
 // ---------------------------------------------------------------------
 
 
+	/**
+	 * This method is called when filter value is updated.
+	 */
+	@Override
+	protected void updateFilters()
+	{
+		if (this.searchString == null || this.searchString.isBlank())
+		{
+			this.filterElements = this.materialList;
+		}
+		else
+		{
+			this.filterElements = this.materialList.stream().
+				filter(element -> {
+					// If element name is set and name contains search field, then do not filter out.
+					return element.name().toLowerCase().contains(this.searchString.toLowerCase());
+				}).
+				distinct().
+				collect(Collectors.toList());
+		}
+	}
+
+
 	/**
 	 * This method builds all necessary elements in GUI panel.
 	 */
 	@Override
-	public void build()
+	protected void build()
 	{
 		PanelBuilder panelBuilder = new PanelBuilder().user(this.user).
 			name(this.user.getTranslation(Constants.TITLE + "manage-blocks"));
@@ -71,9 +98,7 @@ public class ManageBlocksPanel extends CommonPagedPanel
 		panelBuilder.item(3, this.createButton(Button.ADD_BLOCK));
 		panelBuilder.item(5, this.createButton(Button.REMOVE_BLOCK));
 
-		this.populateElements(panelBuilder,
+		this.populateElements(panelBuilder, this.filterElements);
-			this.materialList,
-			o -> this.createElementButton((Material) o));
 
 		// Add return button.
 		panelBuilder.item(44, this.returnButton);
@@ -181,7 +206,8 @@ public class ManageBlocksPanel extends CommonPagedPanel
 	 * @param material material which button must be created.
 	 * @return new Button for material.
 	 */
-	private PanelItem createElementButton(Material material)
+	@Override
+	protected PanelItem createElementButton(Material material)
 	{
 		final String reference = Constants.BUTTON + "material.";
 
@@ -279,4 +305,9 @@ public class ManageBlocksPanel extends CommonPagedPanel
 	 * List of required materials.
 	 */
 	private final Map<Material, Integer> materialMap;
+
+	/**
+	 * Stores filtered items.
+	 */
+	private List<Material> filterElements;
 }

src/main/java/world/bentobox/challenges/panel/admin/ManageEntitiesPanel.java

@@ -8,6 +8,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.function.Consumer;
+import java.util.stream.Collectors;
 
 import org.bukkit.Material;
 import org.bukkit.entity.EntityType;
@@ -28,7 +29,7 @@ import world.bentobox.challenges.utils.Utils;
 /**
  * This class allows to edit entities that are in required entities map.
  */
-public class ManageEntitiesPanel extends CommonPagedPanel
+public class ManageEntitiesPanel extends CommonPagedPanel<EntityType>
 {
 	private ManageEntitiesPanel(CommonPanel parentGUI, Map<EntityType, Integer> requiredEntities)
 	{
@@ -39,6 +40,7 @@ public class ManageEntitiesPanel extends CommonPagedPanel
 		this.entityList.sort(Comparator.comparing(Enum::name));
 
 		this.selectedEntities = new HashSet<>(EntityType.values().length);
+		this.filterElements = this.entityList;
 	}
 
 
@@ -56,11 +58,34 @@ public class ManageEntitiesPanel extends CommonPagedPanel
 // ---------------------------------------------------------------------
 
 
+	/**
+	 * This method is called when filter value is updated.
+	 */
+	@Override
+	protected void updateFilters()
+	{
+		if (this.searchString == null || this.searchString.isBlank())
+		{
+			this.filterElements = this.entityList;
+		}
+		else
+		{
+			this.filterElements = this.entityList.stream().
+				filter(element -> {
+					// If element name is set and name contains search field, then do not filter out.
+					return element.name().toLowerCase().contains(this.searchString.toLowerCase());
+				}).
+				distinct().
+				collect(Collectors.toList());
+		}
+	}
+
+
 	/**
 	 * This method builds all necessary elements in GUI panel.
 	 */
 	@Override
-	public void build()
+	protected void build()
 	{
 		PanelBuilder panelBuilder = new PanelBuilder().user(this.user).
 			name(this.user.getTranslation(Constants.TITLE + "manage-entities"));
@@ -72,9 +97,7 @@ public class ManageEntitiesPanel extends CommonPagedPanel
 		panelBuilder.item(5, this.createButton(Button.REMOVE_ENTITY));
 		panelBuilder.item(8, this.createButton(Button.SWITCH_ENTITY));
 
-		this.populateElements(panelBuilder,
+		this.populateElements(panelBuilder, this.filterElements);
-			this.entityList,
-			o -> this.createEntityButton((EntityType) o));
 
 		// Add return button.
 		panelBuilder.item(44, this.returnButton);
@@ -193,7 +216,8 @@ public class ManageEntitiesPanel extends CommonPagedPanel
 	 * @param entity Entity which button must be created.
 	 * @return new Button for entity.
 	 */
-	private PanelItem createEntityButton(EntityType entity)
+	@Override
+	protected PanelItem createElementButton(EntityType entity)
 	{
 		final String reference = Constants.BUTTON + "entity.";
 
@@ -299,4 +323,9 @@ public class ManageEntitiesPanel extends CommonPagedPanel
 	 * Boolean indicate if entities should be displayed as eggs or mob heads.
 	 */
 	private boolean asEggs;
+
+	/**
+	 * Stores filtered items.
+	 */
+	private List<EntityType> filterElements;
 }