在不同类的类中调用函数

Question

我正在创建一个附加组件.我被困在调用不同类的类的方法.例如...

class A(bpy.types.Operator):
    def execute(self,context):
    #Code
class B(bpy.types.Operator):
    def execute(self,context):
    #Code
    Go back to class A...

我不知道怎么做......

Answer 1

有几种方法可以做到这一点,但它更多的是关于Python的问题而不是关于bpy API的问题.

一种方法

大多数情况下,如果我有操作符之间共享的功能,我会将它们从类中取出并在运算符中引用它们.

def some_shared_function(caller, context):
    # ...
    return 

class A(bpy.types.Operator):
    (...)
    def execute(self,context):
        some_shared_function(self, context)

class B(bpy.types.Operator):
    (...)
    def execute(self,context):
        # other code here
        some_shared_function(self, context)

另一种方法

或者根据传递的参数使操作符的行为不同

class AB(bpy.types.Operator):
    bl_idname = "wm.simple_multi_operator"
    bl_label = "Multi Purpose Operator"

    param_one = StringProperty()
    # param_two = StringProperty()

    def execute(self,context):

        if self.param_one == 'A':
            self.some_functionality(context)

        elif self.param_one == 'B':
            # some other code
            self.some_functionality(context)

        return {'FINISHED'}

    def some_functionality(self, context):
        ...

在您的ui代码中,您将传递这样的参数

row = layout.row()
opname = "wm.simple_multi_operator"
row.operator(opname, text='A').param_one = 'A'
row.operator(opname, text='B').param_one = 'B'

# if you have more than one property for the operator
op_two = row.operator(opname, text='B / Mode Y')
op_two.param_one = 'B'
op_two.param_two = 'Mode Y'

从脚本调用操作符直接以这种方式工作

# or calling from a script
bpy.ops.wm.simple_multi_operator(param_one='A')
bpy.ops.wm.simple_multi_operator(param_one='B')

# with more than one parameter pass the keywords and values
bpy.ops.wm.simple_multi_operator(param_one='B', param_two='Mode Y')

这种方法的优缺点值得一提.

• con:如果您习惯为操作员制作工具提示,则此方法不允许您为按钮定义唯一的工具提示.
• 亲:您可以在不声明全新操作员的情况下快速为操作员提供新功能

另一种方法(使用Python的classmethod装饰器)

import bpy


class A(bpy.types.Operator):
    bl_idname = "object.simple_operator_a"
    bl_label = "Simple Object Operator A"

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

    @classmethod
    def some_function(cls, some_parameter='not woop'):
        print('some_parameter', some_parameter)

class B(bpy.types.Operator):
    bl_idname = "object.simple_operator_b"
    bl_label = "Simple Object Operator B"

    def execute(self,context):
        A.some_function('woooop')
        return {'FINISHED'}


def register():
    bpy.utils.register_module(__name__)


def unregister():
    bpy.utils.unregister_module(__name__)


if __name__ == "__main__":
    register()

然后叫他们:

>>> bpy.ops.object.simple_operator_a()
some_parameter not woop
{'FINISHED'}

>>> bpy.ops.object.simple_operator_b()
some_parameter woooop
{'FINISHED'}

不确定这是否有用,但添加完整性:

# autocomplete from the open parenthesis gives:
>>> bpy.types.OBJECT_OT_simple_operator_a.some_function(
some_function(cls, some_parameter='not woop')

# calling the function, gives:
>>> bpy.types.OBJECT_OT_simple_operator_a.some_function()
some_parameter not woop