TDataSetAction class
TDataSetAction is the base class for all other standard
TDataSet actions.Declaration
TDataSetAction = class(TAction)Inheritance
Descends from it: TDataSetCancel TDataSetDelete TDataSetEdit TDataSetFirst TDataSetInsert TDataSetLast TDataSetNext TDataSetPost TDataSetPrior TDataSetRefresh
Description
TDataSetAction is a
TAction descendant that is the base
class for all other standard
TDataSet actions. TDataSetAction
provides properties and methods which enables an action to be applied to a
DataSource and its associated dataset.
TDataSetAction provides an overridden Notification method to
perform component notifications when the
DataSource is removed for
the action. A virtual
GetDataSet method is implemented to ensure
that a
DataSource is cast to a
TDataSource class
instance prior to accessing its dataset. The
HandlesTarget method
is overridden to determine if the class includes both a valid datasource and
a dataset for a specified target.
Applications do not use instances of TDataSetAction; use one of
the descendent classes that perform a specific action for a dataset.
See also
- TDataSetFirst
- TDataSetLast
- TDataSetNext
- TDataSetPrior
- TDataSetRefresh
- TDataSetCancel
- TDataSetDelete
- TDataSetEdit
- TDataSetInsert
- TDataSetPost
- TAction
Properties
DataSource | public | DataSource with the dataset for the action. |
Methods
Notification | protected | Performs a notification when the datasource for the component is removed. |
GetDataSet | protected | Gets the Dataset assigned to the specified target datasource. |
HandlesTarget | public | Indicates if the action is handled for the specified target. |
Inherited
From TAction (18)
AutoCheck Caption Checked Create DisableIfNoHandler Enabled GroupIndex HelpContext HelpKeyword HelpType Hint ImageIndex OnExecute OnHint OnUpdate SecondaryShortCuts ShortCut Visible
From TCustomAction (20)
AssignTo Destroy DoHint Execute Grayed HandleShortCut SavedEnabledState SetAutoCheck SetCaption SetChecked SetEnabled SetGroupIndex SetHelpContext SetHelpKeyword SetHelpType SetHint SetImageIndex SetName SetShortCut SetVisible
From TContainedAction (8)
ActionList Category GetParentComponent HasParent Index ReadState SetParentComponent Update
From TBasicAction (12)
ActionComponent Change ClientCount Clients ExecuteTarget GetClient OnChange RegisterChanges SetOnExecute Suspended UnRegisterChanges UpdateTarget
From TComponent (68)
_AddRef _Release BeforeDestruction CanObserve ChangeName ComObject ComponentCount ComponentIndex Components ComponentState ComponentStyle DefineProperties DesignInfo DestroyComponents Destroying ExecuteAction FindComponent FreeNotification FreeOnRelease GetChildOwner GetChildParent GetChildren GetDeltaStreams GetEnumerator GetIDsOfNames GetNamePath GetObservers GetOwner GetTypeInfo GetTypeInfoCount iicrGetComponent InsertComponent Invoke IsImplementorOf Loaded Loading Name ObserverAdded Observers OnGetDeltaStreams Owner PaletteCreated QueryInterface ReadDeltaState ReadDeltaStream ReferenceInterface RemoveComponent RemoveFreeNotification RemoveFreeNotifications SafeCallException SetAncestor SetChildOrder SetDesigning SetDesignInstance SetInline SetSubComponent Tag ToString TToStringNameMode UpdateAction Updated UpdateRegistry Updating ValidateContainer ValidateInsert ValidateRename VCLComObject WriteState
From TPersistent (4)
Assign FPOAttachObserver FPODetachObserver FPONotifyObservers
From TObject (37)
AfterConstruction CheckDisposed ClassInfo ClassName ClassNameIs ClassParent ClassType CleanupInstance DefaultHandler DefaultHandlerStr Dispatch DispatchStr Disposed DisposeOf Equals FieldAddress Free FreeInstance GetDisposed GetHashCode GetInterface GetInterfaceByStr GetInterfaceEntry GetInterfaceEntryByStr GetInterfaceTable GetInterfaceWeak GetLastCastErrorInfo InheritsFrom InitInstance InstanceSize MethodAddress MethodName newinstance QualifiedClassName StringMessageTable SystemHasExtendedRTTI UnitName
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