Create CommonGUI panel that will be used in all other GUIs where it is necessary.

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

@@ -0,0 +1,173 @@
+package world.bentobox.challenges.panel;
+
+
+import org.bukkit.Material;
+import org.bukkit.World;
+
+import world.bentobox.bentobox.api.panels.PanelItem;
+import world.bentobox.bentobox.api.panels.builders.PanelItemBuilder;
+import world.bentobox.bentobox.api.user.User;
+import world.bentobox.challenges.ChallengesAddon;
+
+
+/**
+ * This class contains common methods that will be used over all GUIs. It also allows
+ * easier navigation between different GUIs.
+ */
+public abstract class CommonGUI
+{
+// ---------------------------------------------------------------------
+// Section: Variables
+// ---------------------------------------------------------------------
+
+	/**
+	 * This variable stores parent gui.
+	 */
+	private CommonGUI parentGUI;
+
+	/**
+	 * Variable stores Challenges addon.
+	 */
+	protected ChallengesAddon addon;
+
+	/**
+	 * Variable stores world in which panel is referred to.
+	 */
+	protected World world;
+
+	/**
+	 * Variable stores user who created this panel.
+	 */
+	protected User user;
+
+	/**
+	 * Variable stores top label of command from which panel was called.
+	 */
+	protected String topLabel;
+
+	/**
+	 * Variable stores permission prefix of command from which panel was called.
+	 */
+	protected String permissionPrefix;
+
+	/**
+	 * Variable stores any value.
+	 */
+	protected Object valueObject;
+
+	/**
+	 * This object holds current page index.
+	 */
+	protected int pageIndex;
+
+	/**
+	 * This object holds PanelItem that allows to return to previous panel.
+	 */
+	protected PanelItem returnButton;
+
+
+// ---------------------------------------------------------------------
+// Section: Constants
+// ---------------------------------------------------------------------
+
+
+	protected static final String ADMIN = "admin";
+
+	protected static final String CHALLENGES = "challenges";
+
+	protected static final String IMPORT = "import";
+
+	protected static final String SETTINGS = "settings";
+
+	protected static final String DELETE = "delete";
+
+	protected static final String EDIT = "edit";
+
+	protected static final String ADD = "add";
+
+	protected static final String RESET = "reset";
+
+	protected static final String COMPLETE = "complete";
+
+
+// ---------------------------------------------------------------------
+// Section: Constructors
+// ---------------------------------------------------------------------
+
+
+	/**
+	 * Default constructor that inits panels with minimal requirements, without parent panel.
+	 *
+	 * @param addon Addon where panel operates.
+	 * @param world World from which panel was created.
+	 * @param user User who created panel.
+	 * @param topLabel Command top label which creates panel (f.e. island or ai)
+	 * @param permissionPrefix Command permission prefix (f.e. bskyblock.)
+	 */
+	public CommonGUI(ChallengesAddon addon,
+		World world,
+		User user,
+		String topLabel,
+		String permissionPrefix)
+	{
+		this(addon, world, user, topLabel, permissionPrefix, null);
+	}
+
+
+	/**
+	 * Default constructor that inits panels with minimal requirements.
+	 *
+	 * @param addon Addon where panel operates.
+	 * @param world World from which panel was created.
+	 * @param user User who created panel.
+	 * @param topLabel Command top label which creates panel (f.e. island or ai)
+	 * @param permissionPrefix Command permission prefix (f.e. bskyblock.)
+	 * @param parentGUI Parent panel for current panel.
+	 */
+	public CommonGUI(ChallengesAddon addon,
+		World world,
+		User user,
+		String topLabel,
+		String permissionPrefix,
+		CommonGUI parentGUI)
+	{
+		this.addon = addon;
+		this.world = world;
+		this.user = user;
+
+		this.topLabel = topLabel;
+		this.permissionPrefix = permissionPrefix;
+
+		this.parentGUI = parentGUI;
+
+		this.pageIndex = 0;
+
+		this.returnButton = new PanelItemBuilder().
+			name(this.user.getTranslation("challenges.gui.buttons.back")).
+			icon(Material.OAK_DOOR).
+			clickHandler((panel, user1, clickType, i) -> {
+				if (this.parentGUI == null)
+				{
+					this.user.closeInventory();
+					return true;
+				}
+
+				this.parentGUI.build();
+				return true;
+			}).build();
+
+		this.build();
+	}
+
+
+// ---------------------------------------------------------------------
+// Section: Common methods
+// ---------------------------------------------------------------------
+
+
+	/**
+	 * This method builds all necessary elements in GUI panel.
+	 */
+	public abstract void build();
+}
+