Event.mouse from Pie Class to Operator Class

Coding Python Support
1

I’m having a hard time trying to pass properties from the pie menu class to the operator class, moreover when this is a mouse event. I was suggested to use props, I also read on PointerProperty, not sure since I’m new to Python and the Blender API and haven’t seen something similar on other scripts.

Example test:

Summary 
import bpy
from bpy.types import Menu

class COORD_MT_pie(Menu):
    bl_idname = "COORD_MT_pie"
    bl_label = "Mouse Coords Pie"

    first_x : bpy.props.IntProperty()
    first_y : bpy.props.IntProperty()
    
    def invoke(self, context, event):
        if context.space_data.type == 'VIEW_3D':
            props.first_x = self.mouse_x
            props.first_y = self.mouse_y

    def draw(self, context):
        layout = self.layout
        pie = layout.menu_pie()

        props = pie.operator("mouse.my_coords", text = "Coords", icon = 'OBJECT_DATA')


class Coords_OT(bpy.types.Operator):
    bl_idname = "mouse.my_coords"
    bl_label = "Mouse Coords"
    bl_options = {'REGISTER', 'UNDO'}

#    first_x : bpy.props.IntProperty()
#    first_y : bpy.props.IntProperty()

    @classmethod
    def poll(cls, context):
        mode = bpy.context.active_object.mode
        return mode == 'OBJECT' or mode == 'EDIT'

    def modal(self, context, event):
        props.first_x = self.first_x
        props.first_y = self.first_y
        coord = props.first_x, props.first_y
        print(coord)

        return {'FINISHED'}

    def invoke(self, context, event):
        if context.space_data.type == 'VIEW_3D':
            context.window_manager.modal_handler_add(self)
            return {'RUNNING_MODAL'}
        else:
            self.report({'WARNING'}, "Active space must be a View3d")
            return {'CANCELLED'}


def register():
    bpy.utils.register_class(Coords_OT)
    bpy.utils.register_class(COORD_MT_pie)


def unregister():
    bpy.utils.unregister_class(Coords_OT)
    bpy.utils.unregister_class(COORD_MT_pie)

if __name__ == "__main__":
    register()


bpy.ops.wm.call_menu_pie(name="COORD_MT_pie")

Also I’m curious to know if there’s any UI property in the API for (Pie) button highlighting in boolean operators such as with Toggle Overlay, Toggle Xray, etc.