How to use

IMultiModeItem

in

cofh.api.item

/**
 * Decrement the current mode of an item.
 */
default boolean decrMode(ItemStack stack) {
  if (getNumModes(stack) <= 1) {
    return false;
  }
  if (!stack.hasTagCompound()) {
    stack.setTagCompound(new NBTTagCompound());
  }
  int curMode = getMode(stack);
  curMode--;
  if (curMode <= 0) {
    curMode = getNumModes(stack) - 1;
  }
  stack.getTagCompound().setInteger("Mode", curMode);
  return true;
}

public static boolean setHeldMultiModeItemState(EntityPlayer player, int mode) {
  if (!isPlayerHoldingSomething(player)) {
    return false;
  }
  ItemStack heldItem = getMainhandStack(player);
  Item equipped = heldItem.getItem();
  if (equipped instanceof IMultiModeItem) {
    IMultiModeItem multiModeItem = (IMultiModeItem) equipped;
    return multiModeItem.setMode(heldItem, mode);
  } else {
    heldItem = getOffhandStack(player);
    equipped = heldItem.getItem();
    IMultiModeItem multiModeItem = (IMultiModeItem) equipped;
    return multiModeItem.setMode(heldItem, mode);
  }
}

public static void addEmpoweredTip(IMultiModeItem item, ItemStack stack, List<String> tooltip) {
  if (item.getMode(stack) == 1) {
    tooltip.add(StringHelper.localizeFormat("info.redstonearsenal.tool.chargeOff", StringHelper.getKeyName(KeyBindingItemMultiMode.INSTANCE.getKey())));
  } else {
    tooltip.add(StringHelper.localizeFormat("info.redstonearsenal.tool.chargeOn", StringHelper.getKeyName(KeyBindingItemMultiMode.INSTANCE.getKey())));
  }
}

public static boolean decrHeldMultiModeItemState(EntityPlayer player) {
  if (!isPlayerHoldingSomething(player)) {
    return false;
  }
  ItemStack heldItem = getMainhandStack(player);
  Item equipped = heldItem.getItem();
  if (equipped instanceof IMultiModeItem) {
    IMultiModeItem multiModeItem = (IMultiModeItem) equipped;
    return multiModeItem.incrMode(heldItem);
  } else {
    heldItem = getOffhandStack(player);
    equipped = heldItem.getItem();
    IMultiModeItem multiModeItem = (IMultiModeItem) equipped;
    return multiModeItem.incrMode(heldItem);
  }
}

/**
 * Attempt to set the empowered state of the item.
 *
 * @param stack ItemStack to set the mode on.
 * @param mode  Desired mode.
 * @return TRUE if the operation was successful, FALSE if it was not.
 */
default boolean setMode(ItemStack stack, int mode) {
  if (getNumModes(stack) <= 1) {
    return false;
  }
  if (!stack.hasTagCompound()) {
    stack.setTagCompound(new NBTTagCompound());
  }
  if (mode < getNumModes(stack)) {
    stack.getTagCompound().setInteger("Mode", mode);
    return true;
  }
  return false;
}

@Override
public boolean keyPressServer(EntityPlayer player) {
  if (ItemHelper.isPlayerHoldingMultiModeItem(player) && ItemHelper.incrHeldMultiModeItemState(player)) {
    ItemStack heldItem = ItemHelper.getHeldMultiModeStack(player);
    ((IMultiModeItem) heldItem.getItem()).onModeChange(player, heldItem);
    return true;
  }
  return false;
}

public static boolean incrHeldMultiModeItemState(EntityPlayer player) {
  if (!isPlayerHoldingSomething(player)) {
    return false;
  }
  ItemStack heldItem = getMainhandStack(player);
  Item equipped = heldItem.getItem();
  if (equipped instanceof IMultiModeItem) {
    IMultiModeItem multiModeItem = (IMultiModeItem) equipped;
    return multiModeItem.incrMode(heldItem);
  } else {
    heldItem = getOffhandStack(player);
    equipped = heldItem.getItem();
    IMultiModeItem multiModeItem = (IMultiModeItem) equipped;
    return multiModeItem.incrMode(heldItem);
  }
}

/**
 * Increment the current mode of an item.
 */
default boolean incrMode(ItemStack stack) {
  if (getNumModes(stack) <= 1) {
    return false;
  }
  if (!stack.hasTagCompound()) {
    stack.setTagCompound(new NBTTagCompound());
  }
  int curMode = getMode(stack);
  curMode++;
  if (curMode >= getNumModes(stack)) {
    curMode = 0;
  }
  stack.getTagCompound().setInteger("Mode", curMode);
  return true;
}