bl_info = {
    "name": "Box_Tool",
    "category": "Mesh",
    "version": (1, 00, 0),
    "blender": (2, 80, 0)
}

import bpy

class Box_Tool(bpy.types.Operator):
    """Box Tool"""      
    bl_idname = "mesh.box_tool"
    bl_label = "Box_Tool"
    bl_options = {'REGISTER', 'UNDO', 'PRESET'}
    
    scale : bpy.props.FloatProperty(name = "Scale", default = 1, description="Scale")
    l_x : bpy.props.FloatProperty(name = "X", default = 0)
    l_y : bpy.props.FloatProperty(name = "Y", default = 0)
    l_z : bpy.props.FloatProperty(name = "Z", default = 0)

    def draw(self, context):

        layout = self.layout
        box = layout.box()

        row = box.row()
        row.prop(self,"scale")
        row = box.row()
        row.prop(self,"l_x")
        row.prop(self,"l_y")
        row.prop(self,"l_z")

        
    def invoke(self, context, event):
        wm = context.window_manager

        return wm.invoke_props_dialog(self)
        #return self.execute(context)
    
    def execute(self, context):
        
        scale = self.scale
        l_x = self.l_x
        l_y = self.l_y
        l_z = self.l_z
        
        bpy.ops.mesh.primitive_cube_add(size=scale, calc_uvs=True, enter_editmode=False, align='WORLD', location=(l_x, l_y, l_z), rotation=(0, 0, 0), scale=(1, 1, 1))
        
        return {'FINISHED'}

def menu_func(self, context):
    self.layout.operator(Box_Tool.bl_idname)

addon_keymaps = []

def register():
    bpy.utils.register_class(Box_Tool)
    bpy.types.VIEW3D_MT_object.append(menu_func)

def unregister():
    bpy.utils.unregister_class(Box_Tool)
    bpy.types.VIEW3D_MT_object.remove(menu_func)

if __name__ == "__main__":
    register()