JVCL Help:TDataProviderChangeReason
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Type used to specify the change reason.
Pascal
run\JvDataProviderIntf.pas
TDataProviderChangeReason = (
pcrAdd,
pcrDelete,
pcrUpdateItem,
pcrUpdateItems,
pcrDestroy,
pcrContextAdd,
pcrContextDelete,
pcrContextUpdate,
pcrFullRefresh
);
Members
| Members | Description |
| pcrAdd | The Source parameter will refer to the IJvDataItems where the item is about to be added to (DataProviderChanging) or refers to the IJvDataItem that has just been added (DataProviderChanged). |
| pcrDelete | The Source parameter will refer to the IJvDataItem that is about to be deleted (DataProviderChanging) or refers to the IJvDataItems where the item has been just removed from (DataProviderChanging). Note that any sub items are implicitly also deleted, but there will be no additional calls to DataProviderChanging/DataProviderChanged for them. |
| pcrUpdateItem | The Source parameter will refer to the IJvDataItem that is about to change or has just changed. In general this change reason means that one of the item's properties is changing, which also includes the properties of support interfaces. |
| pcrUpdateItems | The Source parameter will refer to the IJvDataItems that is about to change or has just changed. In general this change reason means that either the items list is about to be cleared (or has been cleared) or any of the items list support interface's properties is changing (or has changed). |
| pcrDestroy | This reason will only occur in the DataProviderChanging notification. |
| pcrContextAdd | Source refers to the context the new context is added to (or nil if the context is added at the root) or the context that has just been added. |
| pcrContextDelete | Source refers to the context about to be deleted or the context where a context has just been removed from (or nil if a context at the root was deleted). |
| pcrContextUpdate | Source refers to the context changing or changed. It usually signals the context name is changing or has changed. |
| pcrFullRefresh | The consumer should execute a full refresh (changes are made or being made that affect the entire data tree, including tree structure). |
Description
The TDataProviderChangeReason type is used to specify the reason why the ProviderChanging/ProviderChanged methods are called.
See Also
IJvDataProvider.Changed, IJvDataProvider.Changing, IJvDataProviderNotify
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