ScreenJS

NoThe ~~info~~custom ~~yet!~~ContainerMenu event is a startup event.

Custom Container menus are created in a startup script. They cannot be reloaded without restarting the game. The event is not cancellable.

for block entities made with beJS:

StartupEvents.registry('menu', event => {
    event.create('example_block' /*name has to be same as BlockEntity's id*/, 'block_entity')
        .addSlot(-10, -10) // adds a slot into this x,y position on the texture
        .addSlot(10, 200)
        .loop(builder /*this builder*/=> {
            for(let x = 0; x < 9; x++) {
                for (let y = 0; y < 4; y++) {
                    builder.addSlot(x * 18 /*<- the width of a slot, remember to add this*/, y * 18)
                }
            }
        })
        .addOutputSlot(118, 118) // adds a slot you can't put an item into, but can pull an item from
        .playerInventoryY(100) // marks the start of the player's inventory on the texture
        .tintColor(0x00FF00FF) // a color to tint the whole inventory texture, in hexadecimal [r, g, b, a]
})

for any block:

StartupEvents.registry('menu', event => {
    event.create('grass_block' /*name can be anything*/, 'block')
        /*same parameters as with block entities*/
        .setBlock('minecraft:grass_block') // the block that should open this GUI on right-click
})

for entities:

not yet implemented!

StartupEvents.registry('menu', event => {
    event.create('snow_golem' /*name can be anything*/, 'entity')
        /*same parameters as with block entities*/
        .setEntity('minecraft:snow_golem') // the enity type that should open this GUI on right-click
})

and lastly, for completely separate 'basic' GUIs:

currently nothing can access these!

StartupEvents.registry('menu', event => {
    event.create('snow_golem' /*name can be anything*/)
        /*default parameter set*/
})

basic (this is the default) block_entity block entity

addSlot(x, y) addOutputSlot(x, y) loop() tintColor(color) drawable(screenX, screenY, textureX, textureY, u, v, textureLocation) progressDrawable(x, y, textureX, textureY, textureWidth, textureHeight, textureLocation, direction, type) fluidDrawable(x, y, textureX, textureY, textureWidth, textureHeight, textureLocation, direction, tankIndex) backroundTexture(texture, x, y, u ,v) quickMoveFunc((player, slotIndex, menu) => ... return item) validityFunc((player, pos) => ... return boolean) disablePlayerInventory()
playerInventoryY(yPos)