Constants

Action State Constants	The NavActionState enumeration defines constants you can specify in the `parms` parameter of the function `NavCustomControl` in order to block certain actions in Navigation Services dialog boxes. When you specify these constants, you must also specify the `kNavSetActionState` constant in the `selector` parameter of the `NavCustomControl` function. For more information, see “Controlling User Navigation”. (These constants are only available in Navigation Services 2.0 or later.)
Custom Control Setting Constants	The `NavCustomControlMessage` data type defines constants that your application can pass in the `selector` parameter of the `function` `NavCustomControl` to control various aspects of the active dialog box.
Dialog Option Configuration Constants	In the `dialogOptionFlags` field of a structure of type `NavDialogOptions`, you can specify values for Navigation Services dialog box configuration options. Use the constants defined by the `NavDialogOptionFlags` data type to specify these values.
Discard Changes Action Constants	After you call the function `NavAskDiscardChanges`, your application determines the result of the function call by checking the eventData field of a structure of type `NavCBRec` for one of the constants defined by the `NavAskDiscardChangesResult` data type.
Event Message Constants	Your application can provide an event-handling function to update application windows and handle other events related to your Open and Save dialog boxes. Navigation Services informs you of pertinent events by supplying event message constants to your event-handling function via the `param` field of a structure of type `NavCBRec`. These constants are defined in the `NavEventCallbackMessages` data type. For more information, see “Handling Events”.
File Sorting Constants	Your application can determine the sort key for displayed files by passing the `kNavCtlSortBy` constant, described in “Custom Control Setting Constants”, in the `selector` parameter of the function `NavCustomControl`, and passing one of the constants defined in the `NavSortKeyField` data type in the `parms` parameter of the `NavCustomControl` function.
Generic File Signature Constant	To specify that your application can open all files of a given type (such as `'TEXT'`, for example), specify the `kNavGenericSignature` constant in the `componentSignature` field of the structure of type `NavTypeList` that you pass to a file-opening function such as `NavGetFile`. You can also pass this constant in the `fileCreator` parameter of the function `NavPutFile` in order to override the types of files appearing in the Format pop-up menu. For more information on using NavTypeList structures, see “Providing File Opening Options”. This constant is only available in Navigation Services 2.0 or later.
kNavDefaultNavDlogOptions
kNavDialogOptionsVersion
kNavMissingKindStringErr
Menu Item Selection Constants	To set the default selection for the Show pop-up menu of an Open dialog box, your application passes the `kNavCtlSelectAllType` constant, described in “Custom Control Setting Constants”, in the `selector` parameter of the function `NavCustomControl` and passes one of the constants defined in the `NavPopupMenuItem` data type in the `parms` parameter of the `NavCustomControl` function.
NavActionState
NavAskDiscardChangesResult
NavAskSaveChangesAction
NavAskSaveChangesResult
NavCustomControlMessage
NavFilterModes
NavPopupMenuItem
NavSortKeyField
NavSortOrder
NavTranslationOptions
Object Filtering Constants	Navigation Services passes one of the constants defined by the `NavFilterModes` data type to the `filterMode` parameter of your application-defined filter function to tell your application whether the browser list or one of the navigation option pop-up menus contains the object currently being filtered. For more information, see “Filtering File Objects”.
Save Changes Action Constants	When you call the function `NavAskSaveChanges`, your application specifies a structure of type `NavReplyRecord` in the `reply` parameter. On completion, this structure contains a value represented by one of the constants defined by the `NavAskSaveChangesResult` data type.
Save Changes Request Constants	Your application requests a Save Changes alert box by specifying one of the following constants, defined by the `NavAskSaveChangesAction` data type, in the `action` parameter of the function `NavAskSaveChanges`.
Sort Order Constants	Your application can specify the sort order for displayed files by passing the `kNavCtlSortOrder` constant in the `selector` parameter of the function `NavCustomControl` and passing one of the constants defined in the `NavSortOrder` data type in the `parms` parameter of the `NavCustomControl` function.
Translation Option Constants	Your application passes one of the `NavTranslationOptions` constants to the `howToTranslate` parameter to specify how files are to be translated by the function `NavTranslateFile`.
uppNavEventProcInfo
uppNavObjectFilterProcInfo
uppNavPreviewProcInfo