From 93b99aa3f09221fe681280e66307c8026ef1b00c Mon Sep 17 00:00:00 2001
From: UnknownShadow200 <unknownshadow200@gmail.com>
Date: Wed, 1 Mar 2017 17:21:27 +1100
Subject: [PATCH] Add multiple hotbars for inventory.

You can use alt to switch between first and second hotbar. You can also use alt+number to switch to the nth hotbar.
---
 .../2D/Screens/Inventory/InventoryScreen.Input.cs  |  3 +--
 ClassicalSharp/2D/Widgets/HotbarWidget.cs          | 14 +++++++++++++-
 ClassicalSharp/Game/Inventory.cs                   |  2 +-
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/ClassicalSharp/2D/Screens/Inventory/InventoryScreen.Input.cs b/ClassicalSharp/2D/Screens/Inventory/InventoryScreen.Input.cs
index 2fa96f0a7..23a278633 100644
--- a/ClassicalSharp/2D/Screens/Inventory/InventoryScreen.Input.cs
+++ b/ClassicalSharp/2D/Screens/Inventory/InventoryScreen.Input.cs
@@ -70,8 +70,7 @@ namespace ClassicalSharp.Gui.Screens {
 				ArrowKeyMove(-blocksPerRow);
 			} else if ((key == Key.Down || key == Key.Keypad2) && selIndex != -1) {
 				ArrowKeyMove(blocksPerRow);
-			} else if (key >= Key.Number1 && key <= Key.Number9) {
-				game.Inventory.SelectedIndex = (int)key - (int)Key.Number1;
+			} else if (game.Gui.hudScreen.hotbar.HandlesKeyDown(key)) {
 			}
 			return true;
 		}
diff --git a/ClassicalSharp/2D/Widgets/HotbarWidget.cs b/ClassicalSharp/2D/Widgets/HotbarWidget.cs
index 756c89c67..2aefb71f4 100644
--- a/ClassicalSharp/2D/Widgets/HotbarWidget.cs
+++ b/ClassicalSharp/2D/Widgets/HotbarWidget.cs
@@ -101,7 +101,19 @@ namespace ClassicalSharp.Gui.Widgets {
 		
 		public override bool HandlesKeyDown(Key key) {
 			if (key >= Key.Number1 && key <= Key.Number9) {
-				game.Inventory.SelectedIndex = (int)key - (int)Key.Number1;
+				int index = (int)key - (int)Key.Number1;
+				
+				if (game.Input.AltDown) {
+					// Pick from first to ninth row
+					game.Inventory.Offset = index * Inventory.BlocksPerRow;
+				} else {
+					game.Inventory.SelectedIndex = index;
+				}
+				return true;
+			} else if (key == Key.AltLeft || key == Key.AltRight) {
+				// Alternate between first and second row
+				int index = game.Inventory.Offset == 0 ? 1 : 0;
+				game.Inventory.Offset = index * Inventory.BlocksPerRow;
 				return true;
 			}
 			return false;
diff --git a/ClassicalSharp/Game/Inventory.cs b/ClassicalSharp/Game/Inventory.cs
index f84e63d30..1e7382f4d 100644
--- a/ClassicalSharp/Game/Inventory.cs
+++ b/ClassicalSharp/Game/Inventory.cs
@@ -27,7 +27,7 @@ namespace ClassicalSharp {
 		Game game;
 		public bool CanChangeHeldBlock = true;
 		
-		public const int BlocksPerRow = 9, Rows = 2;
+		public const int BlocksPerRow = 9, Rows = 9;
 		public int Offset = 0;
 		
 		public BlockID[] Hotbar = new BlockID[BlocksPerRow * Rows];