SelectionState Class

Article
11/24/2013

Abstract class representing any selection state. Provides the interface for querying infomation about the specified selection, including: the ActualSelection, CoercedSelection, and weather or not a specifc command is to be filtered out for the selection.

Inheritance Hierarchy

System.Object
  Microsoft.VisualStudio.Modeling.Diagrams.SelectionState
    Microsoft.VisualStudio.Modeling.Diagrams.EmptySelection
    Microsoft.VisualStudio.Modeling.Diagrams.GeneralSelection

Namespace: Microsoft.VisualStudio.Modeling.Diagrams
Assembly: Microsoft.VisualStudio.Modeling.Sdk.Diagrams.12.0 (in Microsoft.VisualStudio.Modeling.Sdk.Diagrams.12.0.dll)

Syntax

'Declaration
Public MustInherit Class SelectionState

public abstract class SelectionState

public ref class SelectionState abstract

[<AbstractClass>]
type SelectionState =  class end

public abstract class SelectionState

The SelectionState type exposes the following members.

Constructors

	Name	Description
	SelectionState

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Properties

	Name	Description
	ActualSelection	Gets the actual selection.
	CoercedSelection	Gets the coerced selection by applying coercion rules to the actual selection. NOTE: The returned value can be null. A null coercion indicates that the selection state doesn't define coercion rules (i.e. a multiple seleciton including only comment connectors is covered by the GeneralSelection state, which doesn't define any coercions rules, so the seleciton's coercion is null). If coercion rules are defined for a selection state, but the coercion fails (as would be the case for a selection including several components belonging to different zones), the coerced selection exists but is empty. These helpers can be used to demystify the results of coercing a selection: * IsCoercible - true if the seleciton can be coerced (i.e. the selection state does define coercion rules). CoercedSelection will return a collection, but it may be empty. * IsCoercionFailure - true if the actual selection can be coerced, but the coercion fails (due coercion rules.) CoercedSelection will be an empy collection. * HasCoercion - true if the actual selection is coercable and its coercion does not fail. CoercedSelection will return a non-empty collection.
	CoercedSelectionCache
	CoercedSelectionModelElements	It is possible for the CoercedSelection to include Pels and Mels which are associated with Pels that are not already included. This method returns a list that replaces the Pels in the coerced selection with their associated Mels, plus any mels from the coerced selection that did not have pels.
	CoercedSelectionPresentationElements	It is possible for the CoercedSelection to include Pels and Mels which are associated with Pels that are not already included. This method returns a collection which excludes any Mels.
	CoercionCompliantSelection	Returns the list of selected objects which comply with the coercion rules. If the selection is coercable, then the coerced selection will be returned; if there is a coercion failure the list will be empty. If there are no coercion rules (!IsCoercable), then the actual selection is returned.
	HasCoercion	Determines if the selection has a valid coercion.
	IsActualSelectionMixed	True if all selected objects in the actual selection are of the same type.
	IsCoercedSelectionMixed	True if all selected objects in the coerced selection are of the same type.
	IsCoercible	Determines if the actual selection can be coerced. Togegher IsCoercible and IsCoercionFailure distinguish between coercion failure, and no coercion available.
	IsCoercionFailure	Togegher IsCoercible and IsCoercionFailure distinguish between coercion failure, and no coercion available.

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Methods

	Name	Description
	CacheCoercedSelection	Cache the specified collection.
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IdentifyCommandsToBeFilteredOutForMultipleSelection	Override to identify the commands which are not valid in a single selection scenario, for this selection state.
	IdentifyCommandsToBeFilteredOutForSingleSelection	Override to identify the commands which are not valid in a single selection scenario, for this selection state.
	Initialize	specifies the actual selection to operate upon.
	IsApplicable	True if the SelectionState appiles to the specified selection (actualSelection.)
	IsCommandToBeFilteredOut	True if the specified command should not be enabled for this selection state. The method is evaluated for the coerced selection.
	IsCommandToBeFilteredOutForMultipleSelection	True if the specified command should not be enabled for this selection state. The method is evaluated for the coerced selection.
	IsCommandToBeFilteredOutForSingleSelection	True if the specified command should not be enabled for this selection state. The method is evaluated for the coerced selection.
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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