LNXSDK/leenkx/blender/lnx/logicnode/physics/LN_on_contact.py

from lnx.logicnode.lnx_nodes import *

def toggle_second_input(self, context):
    """Show/hide the second input socket based on the 'On Any Object' checkbox"""
    if self.property1:  # "On Any Object" is enabled
        # Hide the second input socket
        if len(self.inputs) > 1:
            self.inputs.remove(self.inputs.values()[-1])
    else:  # "On Any Object" is disabled
        # Show the second input socket if it doesn't exist
        if len(self.inputs) == 1:
            self.add_input('LnxNodeSocketObject', 'RB 2')

class OnContactNode(LnxLogicTreeNode):
    """Activates the output when the rigid body make contact with
    another rigid body.

    @option Begin: the output is activated on the first frame when the
        two objects have contact
    @option End: the output is activated on the frame after the last
        frame when the two objects had contact
    @option Overlap: the output is activated on each frame the object
        have contact
    """
    bl_idname = 'LNOnContactNode'
    bl_label = 'On Contact'
    lnx_section = 'contact'
    lnx_version = 1

    property0: HaxeEnumProperty(
        'property0',
        items = [('begin', 'Begin', 'The contact between the rigid bodies begins'),
                 ('overlap', 'Overlap', 'The contact between the rigid bodies is happening'),
                 ('end', 'End', 'The contact between the rigid bodies ends')],
        name='', default='begin')

    property1: HaxeBoolProperty(
        'property1',
        name='On Any Object',
        description='If enabled, triggers on contact with any object instead of a specific object',
        default=False,
        update=toggle_second_input)

    def lnx_init(self, context):
        self.add_input('LnxNodeSocketObject', 'RB 1')
        self.add_input('LnxNodeSocketObject', 'RB 2')

        self.add_output('LnxNodeSocketAction', 'Out')

    def draw_buttons(self, context, layout):
        layout.prop(self, 'property0')
        layout.prop(self, 'property1')  # "On Any Object" checkbox