plone - 扩展 Plone 控制面板表单

Question

是否可以使用每个插件扩展控制面板 View ？

例如
ca.db.core -> 为数据库连接设置制作基本字段集/选项卡
ca.db.person -> 如果已安装，则向“核心”设置添加一个新的字段集/选项卡，用于人员特定字段/设置
ca.db.schema -> 如果已安装，还会为 schema.org 字段添加一个新的字段集/选项卡

Answer 1

是的，这是可能的，我曾经和一个写了 bda.plone.shop 插件的人讨论过这个问题。

他们遇到了同样的问题，并通过使用 ContextProxy 对象解决了这个问题，该对象将不同的模式定义放在一个代理对象中。

使用代理是恕我直言，但我不知道更好的解决方案。

代理尝试从模式列表中获取/设置属性。请注意，您需要处理冲突的名称，这意味着如果您在多个模式中具有相同的字段名称。

class ContextProxy(object):

    def __init__(self, interfaces):
        self.__interfaces = interfaces
        alsoProvides(self, *interfaces)

    def __setattr__(self, name, value):
        if name.startswith('__') or name.startswith('_ContextProxy__'):
            return object.__setattr__(self, name, value)

        registry = getUtility(IRegistry)
        for interface in self.__interfaces:
            proxy = registry.forInterface(interface)
            try:
                getattr(proxy, name)
            except AttributeError:
                pass
            else:
                return setattr(proxy, name, value)
        raise AttributeError(name)

    def __getattr__(self, name):
        if name.startswith('__') or name.startswith('_ContextProxy__'):
            return object.__getattr__(self, name)

        registry = getUtility(IRegistry)
        for interface in self.__interfaces:
            proxy = registry.forInterface(interface)
            try:
                return getattr(proxy, name)
            except AttributeError:
                pass

        raise AttributeError(name)

现在您需要在 ControlPanel 表单中使用代理。我假设您正在使用 plone.registry 中的 RegistryEditForm:

class SettingsEditForm(controlpanel.RegistryEditForm):
    schema = ISettings
    label = _(u"Settings")
    description = _(u"")

    # IMPORTANT Note 1 - This is where you hook in your proxy    
    def getContent(self):
        interfaces = [self.schema]  # Base schema from ca.db.core
        interfaces.extend(self.additionalSchemata) # List of additional schemas
        return ContextProxy(interfaces)

    # IMPORTANT Note 2 - You may get the additional schemas dynamically to extend the Settings Form. For example by name (startswith...)
    # In this case they have a separate interface, which marks the relevant interfaces.
    @property
    def additionalSchemata(self):
        registry = getUtility(IRegistry)
        interface_names = set(record.interfaceName for record
                              in registry.records.values())

        for name in interface_names:
            if not name:
                continue

            interface = None
            try:
                interface = resolve(name)
            except ImportError:
                # In case of leftover registry entries of uninstalled Products
                continue

            if ISettingsProvider.providedBy(interface):
                yield interface

     ...

您可以找到完整代码 here