New API event for opening a quest selection GUI, fixes #1010

main/src/main/java/me/blackvein/quests/Quester.java

@@ -53,6 +53,7 @@ import com.alessiodp.parties.api.interfaces.Party;
 import de.erethon.dungeonsxl.player.DGroup;
 import me.blackvein.quests.events.quest.QuestTakeEvent;
 import me.blackvein.quests.events.quester.QuesterPostStartQuestEvent;
+import me.blackvein.quests.events.quester.QuesterPreOpenGUIEvent;
 import me.blackvein.quests.events.quester.QuesterPreStartQuestEvent;
 import me.blackvein.quests.tasks.StageTimer;
 import me.blackvein.quests.util.ConfigUtil;
@@ -3182,6 +3183,14 @@ public class Quester {
      * @param quests List of quests to use for displaying items
      */
     public void showGUIDisplay(NPC npc, LinkedList<Quest> quests) {
+        if (npc == null || quests == null) {
+            return;
+        }
+        QuesterPreOpenGUIEvent preEvent = new QuesterPreOpenGUIEvent(this, npc, quests);
+        plugin.getServer().getPluginManager().callEvent(preEvent);
+        if (preEvent.isCancelled()) {
+            return;
+        }
         Player player = getPlayer();
         int size = ((quests.size() / 9) + 1) * 9;
         Inventory inv = Bukkit.getServer().createInventory(player, size, Lang.get(player, "quests") + " | " 

main/src/main/java/me/blackvein/quests/events/quester/QuesterPreOpenGUIEvent.java

@@ -0,0 +1,74 @@
+/*******************************************************************************************************
+ * Continued by PikaMug (formerly HappyPikachu) with permission from _Blackvein_. All rights reserved.
+ * 
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *******************************************************************************************************/
+
+package me.blackvein.quests.events.quester;
+
+import java.util.LinkedList;
+
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+
+import me.blackvein.quests.Quest;
+import me.blackvein.quests.Quester;
+import net.citizensnpcs.api.npc.NPC;
+
+/**
+ * Called before a quester opens a quest selection GUI
+ */
+public class QuesterPreOpenGUIEvent extends QuesterEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
+    private NPC npc;
+    LinkedList<Quest> quests;
+    private boolean cancel = false;
+    
+    public QuesterPreOpenGUIEvent(Quester quester, NPC npc, LinkedList<Quest> quests) {
+        super(quester);
+        this.npc = npc;
+        this.quests = quests;
+    }
+    
+    /**
+     * Returns the NPC involved in this event
+     * 
+     * @return NPC who is involved in this event
+     */
+    public NPC getNPC() {
+        return npc;
+    }
+    
+    /**
+     * Returns the list of quests involved in this event
+     * 
+     * @return List of quests involved in this event
+     */
+    public LinkedList<Quest> getQuests() {
+        return quests;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancel;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancel = cancel;
+    }
+    
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+     
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}