Add sorting to LexiconCategory.

src/main/java/vazkii/botania/api/lexicon/LexiconCategory.java

@@ -16,22 +16,50 @@ import java.util.List;
 
 import net.minecraft.util.ResourceLocation;
 
-public class LexiconCategory {
+public class LexiconCategory implements Comparable<LexiconCategory> {
 
+	private static int count = 0;
+	
 	public final String unlocalizedName;
 	public final List<LexiconEntry> entries = new ArrayList<LexiconEntry>();
+	private final int sortingId;
 	private ResourceLocation icon;
+	private int priority = 5;
 
 	/**
 	 * @param unlocalizedName The unlocalized name of this category. This will be localized by the client display.
 	 */
 	public LexiconCategory(String unlocalizedName) {
 		this.unlocalizedName = unlocalizedName;
+		sortingId = count;
+		count++;
 	}
 
 	public String getUnlocalizedName() {
 		return unlocalizedName;
 	}
+	
+	/**
+	 * Sets the priority for this category for sorting. Higher numbers
+	 * means they'll appear first in the book. The basics category
+	 * is 9, the miscellaneous category is 0, other vanilla botania categories
+	 * are 5. Using 9 and 0 is <b>not</b> recommended, since having your
+	 * categories before basics or after miscellaneous is a bad idea.
+	 * If two categories have the same priority they'll be sorted
+	 * by insertion order.
+	 */
+	public LexiconCategory setPriority(int priority) {
+		this.priority = priority;
+		return this;
+	}
+	
+	public int getSortingPriority() {
+		return priority;
+	}
+	
+	public final int getSortingId() {
+		return sortingId;
+	}
 
 	public LexiconCategory setIcon(ResourceLocation icon) {
 		this.icon = icon;
@@ -41,4 +69,9 @@ public class LexiconCategory {
 	public ResourceLocation getIcon() {
 		return icon;
 	}
+
+	@Override
+	public int compareTo(LexiconCategory category) {
+		return priority == category.priority ? sortingId - category.sortingId : category.priority - priority;
+	}
 }

src/main/java/vazkii/botania/client/gui/lexicon/GuiLexicon.java

@@ -13,6 +13,7 @@ package vazkii.botania.client.gui.lexicon;
 
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 import net.minecraft.client.Minecraft;
@@ -51,6 +52,8 @@ public class GuiLexicon extends GuiScreen {
 	public float lastTime = 0F;
 	public float partialTicks = 0F;
 	public float timeDelta = 0F;
+	
+	List<LexiconCategory> allCategories;
 
 	String title;
 	int guiWidth = 146;
@@ -60,6 +63,10 @@ public class GuiLexicon extends GuiScreen {
 	@Override
 	public void initGui() {
 		super.initGui();
+		
+		allCategories = new ArrayList(BotaniaAPI.getAllCategories());
+		Collections.sort(allCategories);
+		
 		lastTime = ClientTickHandler.ticksInGame;
 
 		title = Minecraft.getMinecraft().thePlayer.getCurrentEquippedItem().getDisplayName();
@@ -77,10 +84,10 @@ public class GuiLexicon extends GuiScreen {
 			}
 			populateIndex();
 		} else if(isCategoryIndex()) {
-			int categories = BotaniaAPI.getAllCategories().size();
+			int categories = allCategories.size();
 			for(int i = 0; i < categories + 1; i++) {
 				LexiconCategory category = null;
-				category = i >= categories ? null : BotaniaAPI.getAllCategories().get(i);
+				category = i >= categories ? null : allCategories.get(i);
 				int x = i % 4;
 				int y = i / 4;
 

src/main/java/vazkii/botania/common/lexicon/BLexiconCategory.java

@@ -18,9 +18,10 @@ import vazkii.botania.common.lib.LibLexicon;
 
 public class BLexiconCategory extends LexiconCategory {
 
-	public BLexiconCategory(String unlocalizedName) {
+	public BLexiconCategory(String unlocalizedName, int priority) {
 		super(LibLexicon.CATEGORY_PREFIX + unlocalizedName);
 		setIcon(new ResourceLocation(LibResources.PREFIX_CATEGORIES + unlocalizedName + ".png"));
+		setPriority(priority);
 	}
 
 }

src/main/java/vazkii/botania/common/lexicon/LexiconData.java

@@ -196,15 +196,15 @@ public final class LexiconData {
 	public static LexiconEntry bcIntegration;
 
 	public static void init() {
-		BotaniaAPI.addCategory(categoryBasics = new BLexiconCategory(LibLexicon.CATEGORY_BASICS));
-		BotaniaAPI.addCategory(categoryMana = new BLexiconCategory(LibLexicon.CATEGORY_MANA));
-		BotaniaAPI.addCategory(categoryGenerationFlowers = new BLexiconCategory(LibLexicon.CATEGORY_GENERATION_FLOWERS));
-		BotaniaAPI.addCategory(categoryFunctionalFlowers = new BLexiconCategory(LibLexicon.CATEGORY_FUNCTIONAL_FLOWERS));
-		BotaniaAPI.addCategory(categoryDevices = new BLexiconCategory(LibLexicon.CATEGORY_DEVICES));
-		BotaniaAPI.addCategory(categoryTools = new BLexiconCategory(LibLexicon.CATEGORY_TOOLS));
-		BotaniaAPI.addCategory(categoryBaubles = new BLexiconCategory(LibLexicon.CATEGORY_BAUBLES));
-		BotaniaAPI.addCategory(categoryAlfhomancy = new BLexiconCategory(LibLexicon.CATEGORY_ALFHOMANCY));
-		BotaniaAPI.addCategory(categoryMisc = new BLexiconCategory(LibLexicon.CATEGORY_MISC));
+		BotaniaAPI.addCategory(categoryBasics = new BLexiconCategory(LibLexicon.CATEGORY_BASICS, 9));
+		BotaniaAPI.addCategory(categoryMana = new BLexiconCategory(LibLexicon.CATEGORY_MANA, 5));
+		BotaniaAPI.addCategory(categoryGenerationFlowers = new BLexiconCategory(LibLexicon.CATEGORY_GENERATION_FLOWERS, 5));
+		BotaniaAPI.addCategory(categoryFunctionalFlowers = new BLexiconCategory(LibLexicon.CATEGORY_FUNCTIONAL_FLOWERS, 5));
+		BotaniaAPI.addCategory(categoryDevices = new BLexiconCategory(LibLexicon.CATEGORY_DEVICES, 5));
+		BotaniaAPI.addCategory(categoryTools = new BLexiconCategory(LibLexicon.CATEGORY_TOOLS, 0));
+		BotaniaAPI.addCategory(categoryBaubles = new BLexiconCategory(LibLexicon.CATEGORY_BAUBLES, 5));
+		BotaniaAPI.addCategory(categoryAlfhomancy = new BLexiconCategory(LibLexicon.CATEGORY_ALFHOMANCY, 5));
+		BotaniaAPI.addCategory(categoryMisc = new BLexiconCategory(LibLexicon.CATEGORY_MISC, 0));
 
 		// BASICS ENTRIES
 		introVideo = new BLexiconEntry(LibLexicon.BASICS_INTRO_VIDEO, categoryBasics);