How to assign custom class/function to button press event?

Coding Python Support
1

Hello,

I’ve tried a few times to have a button press trigger a class method (usually my own class), and the button just disappears.

What’s the correct Blender/Python syntax for accomplishing this?

Thanks!

2

Create an operator (see templates in text editor) that calls the class method in its execute() method and add it to a panel.

import bpy

class SomeClass:
    
    @classmethod
    def main(cls, context):
        for ob in context.scene.objects:
            print(ob)


class SimplePanel(bpy.types.Panel):
    """Creates a Panel in the Object properties window"""
    bl_label = "Simple Panel"
    bl_idname = "OBJECT_PT_simple"
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = "object"

    def draw(self, context):
        layout = self.layout
        layout.operator(SimpleOperator.bl_idname)
        

class SimpleOperator(bpy.types.Operator):
    """Tooltip"""
    bl_idname = "object.simple_operator"
    bl_label = "Simple Object Operator"


    def execute(self, context):
        SomeClass.main(context)
        return {'FINISHED'}


def register():
    bpy.utils.register_class(SimpleOperator)
    bpy.utils.register_class(SimplePanel)


def unregister():
    bpy.utils.unregister_class(SimpleOperator)
    bpy.utils.unregister_class(SimplePanel)


if __name__ == "__main__":
    register()

    # test call
    bpy.ops.object.simple_operator()