options

With options you can define the inventory size, page back, page forward, back and cosmetic item. You can also make it for certain categories so you can have more type of inventories in one tree gui. There are an inheritance system so if you change options for some category and insert category inside these category, it will inherit changed options. Remember that if you want to change something, you don't have to specify all options, specify just options that you want change.

options in YAML

data:
- stack: DIRT
  options: 
    # items
    backItem: DIRT
    pageBackItem: STONE
    pageForwardItem: SPONGE
    cosmeticItem: GLASS

    # size (don't change this if you don't know what are you doing)
    rows: 4
    render_actual_rows: 6
    render_offset: 9
    render_header_start: 0
    render_footer_start: 45
    items_on_row: 9

    inventoryType: CHEST
  items:
  - DIRT
  - STONE

categoryOptions in Groovy

In Yaml you can change options for subcategories. With Groovy, you can change it for the main category as well.

inventory {
  categoryOptions {
    backItem {
      type 'DIRT'
    }
    pageBackItem {
      type 'STONE'
    }
    pageForwardItem {
      type 'SPONGE'
    }
    cosmeticItem {
      type 'GLASS'
    }

    
    rows 4
    renderActualRows 6
    renderOffset 9
    renderHeaderStart 0
    renderFooterStart 45
    itemsOnRow 9

    inventoryType 'CHEST'
  }

  category('DIRT') {
    
    categoryOptions {
      backItem {
        type 'BARRIER'
      }
    }

    item('DIRT')
    item('STONE')
  }
}