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ActionFilterProvider Extension-Point
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Identifier: orgeclipsegmfruntimecommonuiservices actionactionFilterProviders Description: This extension-point configures providers for the Action FilterService (orgeclipsegmfruntimecommonuiservices actionfilterActionFilterService) This service allows ActionFilterProvider attributes to be added to existing types, as long as they adapt to IActionFilterProvider by returning the ActionFilterService These ActionFilterProvider attributes can then be used inside the objectState element for enablement or visibility of static action contributions (see orgeclipseuipopupMenus extension-point) It also permits the entire workbench selection to be considered so that an action can be enabled if it is supported on one or more elements in the selection The ActionFilterService selects a provider using one of the following criteria:
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By provider descriptor This uses static XML to determine whether a provider provides the attribute test operation A given provider can declare, in XML, that it supports zero or more name/value pairs (attribute elements); if the name/value of a given action expression matches any of these, it is assumed to provide the operation By provider policy If no name/value pairs are specified in XML for a given provider, the service tries to load a policy for the provider (using the standard mechanism), if one is specified, and asks the policy whether it provides the operation By the provider itself If no name/value pairs and no policy have been specified, the service loads the provider itself and asks whether it provides the operation Typically, it is preferred to use one of the first two criteria for providers
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Note that the value attribute is optional When available in the provider s XML, the value is used in conjunction with the name attribute to determine whether that provider should be considered When not available, only the name is used to make the decision For example, the value attribute for objectState elements of action expressions is sometimes set to either enablement or visibility Some ActionFilterProviders use this information to determine whether the criteria are being tested to determine enablement or visibility for a contribution
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Configuration markup:
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<!ELEMENT extension (ActionFilterProvider)> <!ELEMENT ActionFilterProvider (Priority , Attribute* , Policy )> <!ATTLIST ActionFilterProvider class CDATA #REQUIRED>
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This element describes an ActionFilterProvider that contributes ActionFilter attributes to be used inside objectState elements for enablement or visibility of static action contributions class The name of a fully qualified class that implements the org eclipsegmfruntimecommonuiservicesactionfilterIAction FilterProvider and orgeclipsegmfruntimecommoncoreserviceIProvider interfaces
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<!ELEMENT Priority EMPTY> <!ATTLIST Priority name (Lowest|Low|Medium|High|Highest) >
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This element specifies the priority that this provider has relative to other ActionFilterProviders that are registered to handle the same ActionFilter attribute When such a conflict occurs, the provider with the highest priority is selected to provide the ActionFilter name The name of the provider priority Lowest, Low, Medium, High, or Highest
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<!ELEMENT Attribute EMPTY> <!ATTLIST Attribute name CDATA #REQUIRED value CDATA #IMPLIED>
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This element describes a new ActionFilter attribute name The name of the ActionFilter attribute, which is used to identify the provider that should perform the test for objectState elements used in action enablement or visibility criteria value The optional value of the ActionFilter attribute When provided, it is also used to identify the provider that should perform the test for objectState elements use in action enablement or visibility criteria
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<!ELEMENT Policy EMPTY> <!ATTLIST Policy class CDATA #IMPLIED>
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This element can specify a policy to determine whether this provider should be asked to test an ActionFilter attribute The policy is used only if no attribute elements are defined for the provider To delay plug-in loading, the recommended strategy for policies is to define them in a separate package and add BundleActivationPolicy: lazy in the MANIFESTMF so that loading the policy class does not load the plug-in class The fully qualified name of the class that implements org eclipsegmfruntimecommoncoreserviceIProviderPolicy Examples: The following is an example of an ActionFilterProvider extension:
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<extension-point=" orgeclipsegmfruntimecommonuiservicesaction actionFilterProviders"> <ActionFilterProvider class=" orgeclipsetestprojectuiprovidersaction AllAreElementsActionFilterProvider"> <Priority name="Highest"/> <Attribute name="AllAreElements" value="enablement"/> <Attribute name="AllAreElements" value="visibility"/> </ActionFilterProvider> </extension>
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API information: For convenience, the provider can be a subclass of orgeclipsegmf runtimecommonuiservicesactionfilterAbstractActionFilter Provider Additionally, orgeclipsegmfruntimeemfuiservices actionAbstractModelActionFilterProvider is available and wraps queries on this provider in the context of a read action using a TransactionalEditingDomain Notes: Diagrams generated using the GMF tooling do not currently use this extension-point A LogicActionFilterProvider is used in the logic diagram example, although it seems to be a temporary workaround for a platform bug Nevertheless, it illustrates how to filter the Add Circuit and Add Half Adder pop-up menu contributions from elements that are not ContainerElement types
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