TcxCustomDataController.IsPattern Property

Indicates whether the current detail data controller is a pattern, as defined below.

Declaration

delphi

property IsPattern: Boolean read; write;

Property Value

Type
Boolean

Remarks

A non-pattern data controller is any data controller containing records with which the end-user can interact (via the ExpressQuantumGrid , for instance). The IsPattern function returns False for:

Clones of a detail data controller
Data controllers without master data controllers (such data controllers have no patterns at all)

The term “pattern” can be applied only to detail data controllers. A pattern data controller does not contain data and is only used to provide settings when creating its clones (instances of a detail data controller corresponding to particular records in a master data controller).

The TcxCustomDataController topic provides more information on patterns and clones.

The following image demonstrates a Structure Navigator of ExpressQuantumGrid displaying a master-detail relationship between two Views (MasterTableView and DetailTableView):

The Views are associated with the master and detail data controllers respectively, say MasterDataController and DetailDataController. MasterDataController is a non-pattern, as it has no master data controller. DetailDataController is a pattern. It is used only as a template for creating its clones.

Settings of detail clones can be changed independently. Also, changing settings of a pattern detail data controller does not affect its existing clones until the ClearDetails method of a non-pattern master data controller is called. This recreates existing detail clones with the current settings from the pattern detail data controller.