Providing Document Previews

Navigation Services provides a preview area in all dialog boxes that open files. This area can be toggled on or off by the user. If the preview area is visible, Navigation Services will automatically display a preview of any file that contains a valid QuickTime component of type 'pnot' . You can request automatic preview display by setting the kNavAllowPreviews constant in the dialogOptionFlags field of the structure of type NavDialogOptions that you pass in the dialogOptions parameter of the file-opening function. You can provide your own previews and add custom controls to the preview area, as well. For more information on preview functions, see Drawing Custom Previews. For more information on'pnot' resources, see Inside Macintosh: QuickTime Components .

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