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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 automatically displays a preview of any file that contains a valid QuickTime component of type
'pnot'
. Under Navigation Services 2.0 or later, you can call the function to create a preview. You can request automatic preview display by setting the
kNavAllowPreviews
constant in the
dialogOptionFlags
field of the structure of type that you pass in the
dialogOptions
parameter of the file-opening function. (This option is set by default.) You can provide your own preview function 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
.
