handling clicks in the creative inventory of minecraft

    /**
     * An override mouse click method to add control when using the creative inv. hack
     *
     * @author oxguy3
     */
    protected void mouseClicked(int i, int j, int k)
    {
        if (mc.playerController.isInCreativeMode()||!mc.thePlayer.shouldShowCreativeInventory) { //if not using the hack to get creative inv, or legitimately in creative gamemode

            super.mouseClicked(i, j, k); //use the vanilla code instead of my shit

        } else { //if using the hack to get creative inv

            if (mc.thePlayer instanceof EntityPlayerSP) { //if in SSP
                //super.super.mouseClicked(i, j, k);

                if (k == 0 || k == 1) { //if left or right click

                    int stackSize = 64;
                    if (k == 1) { //if right click
                        stackSize = 1;
                    }

                    Slot cslot = super.getSlotAtCoords(i, j);
                    if (cslot!=null) { //if they actually clicked a slot

                        ItemStack slotstack = cslot.getStack();
                        ItemStack pstack = mc.thePlayer.inventory.getItemStack();

                        if (slotstack!=null) { //if there is an item in that slot

                            if(pstack==null) { //if the player is not holding an item with the cursor

                                if (cslot.slotNumber>=72&&cslot.slotNumber<=80) { //if hotbar slots, use the stack's size instead of 64
                                    stackSize = slotstack.stackSize;
                                }

                                if (k == 1 && stackSize > 1) { //if right click and there's more than 1 item, only use half of the stack
                                    stackSize = stackSize/2;
                                }


                                mc.thePlayer.inventory.setItemStack(new ItemStack(slotstack.itemID, stackSize, slotstack.getItemDamage()));


                                if (cslot.slotNumber>=72&&cslot.slotNumber<=80) { //hotbar slots

                                    if (k == 1 && stackSize > 1) { //if right click and there's more than 1 item

                                        int newslotsize = slotstack.stackSize-stackSize; //take what was left after halving the stack
                                        cslot.putStack(new ItemStack(slotstack.itemID, newslotsize, slotstack.getItemDamage())); //put that remainder back in the slot

                                    } else { //if left click

                                        cslot.putStack(null); //remove the stack from the slot
                                    }
                                }

                            } else { //if the player is holding an item with the cursor

                                if (cslot.slotNumber>=72&&cslot.slotNumber<=80) { //if clicked in the hotbar slots

                                    //if they're the same item type and they're stackable and the slot stack isn't already full
                                    if (pstack.isItemEqual(cslot.getStack())&&pstack.isStackable()&&cslot.getStack().stackSize<64) {
                                        ItemStack cstack = cslot.getStack();

                                        if (k == 0) { //if left click

                                            while (cslot.getStack().stackSize<64&&pstack.stackSize>=1) { //while the slot isnt full and the hand isnt empty
                                                pstack.stackSize-=1;

                                                //N.B. the 2nd param for the ItemStack constructor should NOT be changed to cstack!!!
                                                cslot.putStack(new ItemStack(cstack.itemID, cslot.getStack().stackSize+1, cstack.getItemDamage()));
                                            }

                                        } else { //if right click
                                            pstack.stackSize-=1;
                                            cslot.putStack(new ItemStack(cstack.itemID, cstack.stackSize+1, cstack.getItemDamage()));

                                        }
                                        if (pstack.stackSize==0) { //destroy the held stack if its empty, or else it'll generate dupes
                                            mc.thePlayer.inventory.setItemStack(null);
                                        }

                                    } else { //if the items aren't the same, and should simply be swapped

                                        ItemStack swappy = pstack.copy();
                                        mc.thePlayer.inventory.setItemStack(slotstack); //switch the held item with the slot item
                                        cslot.putStack(pstack);
                                    }

                                } else { //if not in the hotbar slots

                                    if (k == 0) { //if left click
                                        mc.thePlayer.inventory.setItemStack(null);

                                    } else { //if right click
                                        mc.thePlayer.inventory.setItemStack(new ItemStack(pstack.itemID, pstack.stackSize-1, pstack.getItemDamage()));
                                    }
                                }
                            }


                        } else { //if there is not an item in that slot


                            if (pstack!=null) { //if the player is holding an item with the cursor

                                if (cslot.slotNumber>=72&&cslot.slotNumber<=80) { //if clicked in hotbar slots

                                    if (k == 0) { //if left click
                                        cslot.putStack(pstack);
                                        mc.thePlayer.inventory.setItemStack(null);

                                    } else { //if right click
                                        cslot.putStack(new ItemStack(pstack.itemID, 1, pstack.getItemDamage()));
                                        mc.thePlayer.inventory.setItemStack(new ItemStack(pstack.itemID, pstack.stackSize-1, pstack.getItemDamage()));

                                        //this code has been moved to the end of the hotbar slots IF statement
                                        /*if (pstack.stackSize==0) { //destroy the held stack if its empty, or else it'll generate dupes
                                            mc.thePlayer.inventory.setItemStack(null);
                                        }*/
                                    }

                                } else { //if not in the hotbar slots

                                    if (k == 0) { //if left click
                                        mc.thePlayer.inventory.setItemStack(null);

                                    } else { //if right click
                                        mc.thePlayer.inventory.setItemStack(new ItemStack(pstack.itemID, pstack.stackSize-1, pstack.getItemDamage()));
                                    }

                                }

                                if (pstack.stackSize==0) { //destroy the held stack if its empty, or else it'll generate dupes
                                    mc.thePlayer.inventory.setItemStack(null);
                                }
                            }
                        }
                    }
                }

            } else { //if in SMP
                super.mouseClicked(i, j, k);

            }
        }
    }