3. Usage¶

Please refer to Manager - Api for precise usage examples.

A Component package contains at least a resource .rc description file and a main module:

testsComponentA
├── __init__.py
├── testsComponentA.py
└── testsComponentA.rc

The description file is a configuration style file with a structure similar to what you would find in Microsoft Windows INI files:

[Component]
Name = core.testsComponentA
Title = Tests Component A
Module = testsComponentA
Object = TestsComponentA
Version = 1.0

[Informations]
Author = Thomas Mansencal
Email = [email protected]
Url = http://www.hdrlabs.com/
Description = Core tests Component A.

Given the following directories structure:

core
├── __init__.py
├── testsComponentA
│   ├── __init__.py
│   ├── testsComponentA.py
│   └── testsComponentA.rc
└── testsComponentB
        ├── __init__.py
        ├── testsComponentB.py
        └── testsComponentB.rc

Instantiating the Components Manager is done the following way:

>>> manager = Manager(("./manager/tests/testsManager/../components/core",))
>>> manager.registerComponents()
True
>>> manager.listComponents()
['core.testsComponentA', 'core.testsComponentB']
>>> manager.instantiateComponents()
True
>>> manager.getInterface("core.testsComponentA")
<testsComponentA.TestsComponentA object at 0x11dd990>

manager.componentsManager.Manager.getInterface(name) method returns the interface of given Component, in the previous example it’s the object declared in the description file by this statement: Object = TestsComponentA.

Three base Components are provided by default:

• manager.component.Component
• manager.qobjectComponent.QObjectComponent
• manager.qwidgetComponent.QWidgetComponent

When inheriting from those Components, one have to reimplement the following methods for all the Components types:

• activate
• deactivate

activated attribute has to be set accordingly in the methods implementation.

When implementing a manager.qwidgetComponent.Component or manager.qobjectComponent.QObjectComponent, the following methods are also needed:

• initialize
• uninitialize

initialized attribute has to be set accordingly in the methods implementation.

Or alternatively, those methods when implementing a manager.qwidgetComponent.QWidgetComponent:

• initializeUi
• uninitializeUi

initializedUi attribute has to be set accordingly in the methods implementation.

Reference Component implementation example class:

class TestsComponentA(Component):

        def __init__(self, name=None):
                Component.__init__(self, name=name)

                self.deactivatable = True

        def activate(self):
                print("> Activating '{0}' Component.".format(self.__class__.__name__))

                self.activated = True
                return True

        def deactivate(self):
                print("> Deactivating '{0}' Component.".format(self.__class__.__name__))

                self.activated = False
                return True

        def initialize(self):
                print("> Initializing '{0}' Component.".format(self.__class__.__name__))

                self.initialized = True
                return True

        def uninitialize(self):
                print("> Uninitializing '{0}' Component.".format(self.__class__.__name__))

                self.initialized = False
                return True