Inside Macintosh: QuickDraw GX Printing /

Chapter 3 - Page Formatting and Dialog Box Customization / Page Formatting and Dialog Box Customization Reference

Panel-Related Constants and Data Types

Panel Responses

A handler of a panel in a dialog box (including applications, printing extensions, printer drivers, and Macintosh system software) can return any value of type OSErr as the result of handling the panel. In addition, a panel handler can return an event of type gxPanelResult, as shown here. This data type is used with the GXHandlePanelEvent override function, which is described on page 3-123.

enum {
   gxPanelNoResult            = 0,
   gxPanelCancelConfirmation  = 1
};
typedef long gxPanelResult;

Constant descriptions

gxPanelNoResult

The result field does not currently have any meaning.

gxPanelCancelConfirmation

This result is only valid if the panel event (as described in the previous section) was of type gxPanelUserWillConfirmEvt. After the user confirms the panel, if the panel handler discovers that the user entered an inappropriate value, the panel handler alerts the user to the problem and generates this response, which tells QuickDraw GX to not confirm the dialog box. This allows the user the opportunity to fix the problem.

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