CatServer/patches/net/minecraft/client/gui/advancements/GuiScreenAdvancements.java.patch

--- ../src-base/minecraft/net/minecraft/client/gui/advancements/GuiScreenAdvancements.java
+++ ../src-work/minecraft/net/minecraft/client/gui/advancements/GuiScreenAdvancements.java
@@ -29,6 +29,7 @@
     private int scrollMouseX;
     private int scrollMouseY;
     private boolean isScrolling;
+    private static int tabPage, maxPages;
 
     public GuiScreenAdvancements(ClientAdvancementManager p_i47383_1_)
     {
@@ -49,6 +50,14 @@
         {
             this.clientAdvancementManager.setSelectedTab(this.selectedTab == null ? null : this.selectedTab.getAdvancement(), true);
         }
+        if (this.tabs.size() > AdvancementTabType.MAX_TABS)
+        {
+            int guiLeft = (this.width - 252) / 2;
+            int guiTop = (this.height - 140) / 2;
+            this.buttonList.add(new net.minecraft.client.gui.GuiButton(101, guiLeft, guiTop - 50, 20, 20, "<"));
+            this.buttonList.add(new net.minecraft.client.gui.GuiButton(102, guiLeft + 252 - 20, guiTop - 50, 20, 20, ">"));
+            maxPages = this.tabs.size() / AdvancementTabType.MAX_TABS;
+        }
     }
 
     public void onGuiClosed()
@@ -71,7 +80,7 @@
 
             for (GuiAdvancementTab guiadvancementtab : this.tabs.values())
             {
-                if (guiadvancementtab.isMouseOver(i, j, mouseX, mouseY))
+                if (guiadvancementtab.getPage() == tabPage && guiadvancementtab.isMouseOver(i, j, mouseX, mouseY))
                 {
                     this.clientAdvancementManager.setSelectedTab(guiadvancementtab.getAdvancement(), true);
                     break;
@@ -122,6 +131,14 @@
         this.drawDefaultBackground();
         this.renderInside(mouseX, mouseY, i, j);
         this.renderWindow(i, j);
+        super.drawScreen(mouseX, mouseY, partialTicks);
+        if (maxPages != 0)
+        {
+            String page = String.format("%d / %d", tabPage + 1, maxPages + 1);
+            int width = this.fontRenderer.getStringWidth(page);
+            GlStateManager.disableLighting();
+            this.fontRenderer.drawStringWithShadow(page, i + (252 / 2) - (width / 2), j - 44, -1);
+        }
         this.renderToolTips(mouseX, mouseY, i, j);
     }
 
@@ -163,6 +180,7 @@
 
             for (GuiAdvancementTab guiadvancementtab : this.tabs.values())
             {
+                if(guiadvancementtab.getPage() == tabPage)
                 guiadvancementtab.drawTab(p_191934_1_, p_191934_2_, guiadvancementtab == this.selectedTab);
             }
 
@@ -172,6 +190,7 @@
 
             for (GuiAdvancementTab guiadvancementtab1 : this.tabs.values())
             {
+                if(guiadvancementtab1.getPage() == tabPage)
                 guiadvancementtab1.drawIcon(p_191934_1_, p_191934_2_, this.itemRender);
             }
 
@@ -199,7 +218,7 @@
         {
             for (GuiAdvancementTab guiadvancementtab : this.tabs.values())
             {
-                if (guiadvancementtab.isMouseOver(p_191937_3_, p_191937_4_, p_191937_1_, p_191937_2_))
+                if (guiadvancementtab.getPage() == tabPage && guiadvancementtab.isMouseOver(p_191937_3_, p_191937_4_, p_191937_1_, p_191937_2_))
                 {
                     this.drawHoveringText(guiadvancementtab.getTitle(), p_191937_1_, p_191937_2_);
                 }
@@ -273,4 +292,13 @@
 
         return this.tabs.get(p_191935_1_);
     }
+
+    @Override
+    protected void actionPerformed(net.minecraft.client.gui.GuiButton button) throws IOException
+    {
+        if(button.id == 101)
+            tabPage = Math.max(tabPage - 1, 0);
+        else if(button.id == 102)
+            tabPage = Math.min(tabPage + 1, maxPages);
+    }
 }