#include <Controls.h>

typedef struct CtlCTab { Size Offset Description

long ccSeed; 4 0 Unused, value = 0

short ccReserved; 2 4 Unused, value = 0

short ctSize; 2 6 Elements in control's color table,

minus 1

ColorSpec ctTable[4]; 4 8 Address of colorSpec records

typedef CtlCTab * CCTabPtr;

typedef CCTabPtr * CCTabHandle;

Notes: A colorSpec record holds an identifying short that says which part of the

cThumbColor) and three shorts that define the values of the color's red,

green and blue components. The part identifiers can be listed in any order,

but if a part is not identified at all, it will be drawn with the first color in

If the color table is stored as resource type 'cctb' it still has this

structure, and resides in the system in the same format as a 'clut' color

table resource. A call to InitWindows loads the default color control

resource 'cctb' = 0 into the application heap when your program starts up.

The default is shared by all controls, regardless of type, and will be used in

cases where there's no AuxCtlRec with an acOwner field pointing to the

control being drawn. If you choose to set up your own color tables for your

controls they can be as big as you want. You can also define them any way

you want, except for using reserved part index numbers 1 through 127.

highlighted check boxes and radio buttons change appearance but keep their

colors the same. A deactivated button of any variety is indicated by dimmed

Scrollbars use the same partIdentifier and partRGB fields as the buttons,

except that the cThumbColor field is filled in, while the cTextColor field is

deactivated scrollbar lacks an indicator and shows a solid background color.

Creating a new control with NewControl doesn't simultaneously create a

new entry on the AuxList. Your controls will use the default color table

unless you call SetCtlColor or create the control from a 'CNTL' resource

by a call to GetNewControl and there is also an associated 'cctb' resource

with the same ID in the resource file. If both types of resources exist, and

they both have the same ID, GetNewControl will execute SetCtlColor.

Further, your control's colors will be limited to the eight accommodated

by the old-style grafPort unless your windows are opened in a cGrafPort by

a call to NewCWindow. If you want controls with more than four colors

you have to customize a 'CDEF' resource to recognize the extra colors and

your applications 'CDEF' has to invoke SysEnvirons during the definition