[Blender2.8]Pythonスクリプトで、Operatorのトグルボタンを作成する方法

import bpy

bpy.types.Scene.testBool = bpy.props.BoolProperty(name = 'test Bool', default = False)

class TestOperator(bpy.types.Operator):
    bl_idname = 'test.test_operator'
    bl_label = 'Test Operator'
    
    def execute(self, context):
        if bpy.context.scene.testBool == False:
            print('Button Pressed')
            bpy.context.scene.testBool = True
        else:
            print('Button Un Pressed')
            bpy.context.scene.testBool = False
        return{'FINISHED'}


class TestPanel(bpy.types.Panel):
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = 'TestTab'
    bl_label = 'Test Toggle'
    
    def draw(self, context):
        layout = self.layout
        
        if bpy.context.scene.testBool == True:
            btn_text = 'button ON'
        else:
            btn_text = 'button OFF'
        
        layout.operator('test.test_operator', text = btn_text, depress = bpy.context.scene.testBool)
        
        
def register():
    bpy.utils.register_class(TestOperator)
    bpy.utils.register_class(TestPanel)
    
def unregister():
    bpy.utils.unregister_class(TestOperator)
    bpy.utils.unregister_class(TestPanel)
    
if __name__ == '__main__':
    register()

解説