TweetFollow Us on Twitter

Selective Color
Volume Number:10
Issue Number:1
Column Tag:C Workshop

Related Info: Dialog Manager

Selective Color

Using custom color buttons on color and black and white Macs

By Mark W. Batten, Washington, D.C.

Note: Source code files accompanying article are located on MacTech CD-ROM or source code disks.

Custom color buttons enliven any application, but if the programmer is writing software that must run on both black-and-white and color machines (as most of us are), it may seem daunting to write code that will draw the button different ways on differently configured machines. This article demonstrates a simple scheme to create buttons that are smart enough to be custom-drawn on color machines, and as regular Toolbox buttons on black-and-white machines.

The key to the technique is the Toolbox routine SetDItem. Although generally used only to change a dialog item’s rectangle, SetDItem is actually quite powerful; it lets you change just about everything associated with a dialog item. In this example, we’ll use it to point the Mac to our own CDEF to draw the button on color machines.

Setting Up The Resources

First, you need to create the CDEF that draws the color button. At the end of this article is source code for a sample button with a nice 3-D appearance.

(This particular CDEF uses an “auxiliary control record” (as described in Inside Macintosh, Vol. 5, pp. 216-18) to tell it what colors to draw the control in. If you’ve never encountered these arcane things, don’t worry; you don’t need to understand them to implement the scheme described in the article).

Second, create a dialog (DLOG) and a dialog item list (DITL) for your application as you normally would. Be sure that your DLOG will not be displayed when it’s loaded (in ResEdit, be sure the “Initially visible” box is unchecked). The DITL should use normal, vanilla buttons for OK and Cancel. That way, the resource is all set up to run normally on black-and-white machine, without any more work.

For this example, you also need to create two other resources: a dialog color table (‘dctb’) and a control color table (‘cctb’). (The correct values for the sample are listed at the end of this article). The ‘dctb’ serves two functions here: first, when you call GetNewDialog to read in a dialog, the Mac will automatically make it a color dialog, based on a CGrafPort, if the Mac finds a ‘dctb’ with the same ID as the DLOG resource. Second, the ‘dctb’ colors the content area of the dialog, which makes our button look better. The CDEF uses the ‘cctb’ resource to determine what colors to use when drawing the custom button.

Making The Switch

On a black-and-white Mac, the dialog will perform as it’s supposed to, without any special code in your application. To do something fancier on color machines, your application just has to alert the Dialog Manager to use our custom CDEF instead of the standard one. Here are the necessary steps.

1. In your application’s initialization routines, load the CDEF resource and the cctb color table into variables, like this:


/* 1 */

 Handle myCDEF;  /* handle to our custom CDEF */
 CTabHandle CtrlCTab;/* handle to colors for our control */

 myCDEF=GetResource('CDEF',32); 
 CtrlCTab=(CTabHandle)GetResource('cctb',128);

2. When you’re ready to create the dialog, load it with GetNewDialog (or build it from scratch with NewDialog). Then call the following routine, which uses SetDItem to tell the Mac where to find our custom code. Pass the DialogPtr in d and the item number of the button you want to convert in i:

/* 2 */

ConvertToColorButtons(d,i)
DialogPtr d;
int i; 
{
 int j; 
 Handle tItem; 
 Rect box; 
 char n[31];

 GetDItem(d,i,&j,&tItem,&box);
 if(j==ctrlItem+btnCtrl || 
 j==ctrlItem+btnCtrl+itemDisable){
 SetCtlColor(tItem,CtrlCTab);
 (**((ControlHandle)tItem)).contrlDefProc=myCDEF;
 j&=127;
 SetDItem(d,i,j,tItem,&box); 
 }
}
 Here's the CDEF code.

pascal long main(var,CH,msg,par)
int msg,var;
ControlHandle CH;
long par;
{
 long l;

 l=0L;
 switch(msg){
 case 0: 
 doDraw(CH); 
 break;
 case 1: 
 l=(long)doTest(par,CH); 
 break;
 case 2: 
 doCalc(par,CH); 
 break;
 }
 return l;
}

doTest(par,CH)
long par;
ControlHandle CH;
{
 Point pt;

 pt.v=HiWord(par); 
 pt.h=LoWord(par);
 return (int)PtInRect(pt,&((**CH).contrlRect));
}

doCalc(par,CH)
RgnHandle par;
ControlHandle CH;
{
 par=(RgnHandle)((long)par&0x7FFFFFFF);
 RectRgn(par,&((**CH).contrlRect));
}

doDraw(CH)
ControlHandle CH;
{
 int j,k,*p;
 Handle tItem;
 Rect r;
 RGBColor rgb,rgb1,rgb2; 
 AuxCtlHandle ax;
 FontInfo inf;
 
 r=(**CH).contrlRect; 
 j=StringWidth((**CH).contrlTitle); 
 GetFontInfo(&inf); 
 k=inf.ascent+inf.descent;
 k=(r.top+r.bottom+k)/2;
 MoveTo((r.left+r.right-j)/2,k-inf.descent);
 DrawString((**CH).contrlTitle);
 GetAuxCtl(CH,&ax);
 
 p=(int *)&(**(**ax).acCTable).ctTable[0].rgb.red; 
 rgb.red=p[0];   /* 21845, 0x5555*/
 rgb.green=p[1]; /* 21845, 0x5555*/
 rgb.blue=p[2];  /* 21845, 0x5555*/
 rgb1.red=p[4];  /* 34952, 0x8888*/
 rgb1.green=p[5];/* 34952, 0x8888*/
 rgb1.blue=p[6]; /* 34952, 0x8888*/
 rgb2.red=rgb2.green=rgb2.blue=0xFFFF;
 
 PenSize(2,2);
 RGBForeColor(&rgb);
 MoveTo(r.right-2,r.top); 
 LineTo(r.left,r.top);
 LineTo(r.left,r.bottom-2); 
 RGBForeColor(&rgb2);
 MoveTo(r.right-2,r.top+1);
 LineTo(r.right-2,r.bottom-2);
 LineTo(r.left,r.bottom-2); 
 rgb2.red=rgb2.green=rgb2.blue=0;
 RGBForeColor(&rgb2);
 InsetRect(&r,2,2);
 FrameRect(&r);

 InsetRect(&r,2,2);
 if(!(**CH).contrlHilite){
 PenSize(1,1);
 RGBForeColor(&rgb);
 MoveTo(r.left,r.top);
 LineTo(r.left,r.bottom-2);
 PenSize(2,2); 
 LineTo(r.right-2,r.bottom-2);
 Move(0,-1);
 PenSize(1,1);
 RGBForeColor(&rgb1);
 LineTo(r.left+1,r.bottom-3);
 LineTo(r.left+1,r.top);
 LineTo(r.right-1,r.top);
 Move(0,1);
 rgb2.red=rgb2.green=rgb2.blue=0xFFFF; 
 RGBForeColor(&rgb2);
 LineTo(r.left+2,r.top+1);
 }
 else {
 MoveTo(r.right-2,r.top);
 RGBForeColor(&rgb);
 LineTo(r.left,r.top);
 PenSize(1,1);
 LineTo(r.left,r.bottom-3);
 PenSize(3,3);
 LineTo(r.right-3,r.bottom-3); 
 PenSize(1,1);
 Move(2,-1);
 RGBForeColor(&rgb1); 
 LineTo(r.left+1,r.bottom-4);
 LineTo(r.left+1,r.top+2);
 LineTo(r.right-1,r.top+2);
 }
 rgb2.red=rgb2.green=rgb2.blue=0;
 RGBForeColor(&rgb2); 
}

The values for the color table resources for the example are as follows:

The control color table (type 'cctb') has two entries. The part codes are just 0 and 1 (the CDEF doesn't really use these) and the colors are { 0x5555,0x5555,0x5555 } and { 0x8888,0x8888,0x8888 }.

The dialog color table (type 'dctb') must have five entries, with part codes of 0-4, and colors as follows: { 0xAAAA,0xAAAA,0xAAAA }, { 0x5555,0x5555, 0x5555 }, { 0,0,0 }, { 0,0,0 }, { 0,0,0 }.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Hopper Disassembler 4.2.5- - Binary disa...
Hopper Disassembler is a binary disassembler, decompiler, and debugger for 32-bit and 64-bit executables. It will let you disassemble any binary you want, and provide you all the information about... Read more
BetterTouchTool 2.261 - Customize Multi-...
BetterTouchTool adds many new, fully customizable gestures to the Magic Mouse, Multi-Touch MacBook trackpad, and Magic Trackpad. These gestures are customizable: Magic Mouse: Pinch in / out (zoom... Read more
Sketch 44.1 - Design app for UX/UI for i...
Sketch is an innovative and fresh look at vector drawing. Its intentionally minimalist design is based upon a drawing space of unlimited size and layers, free of palettes, panels, menus, windows, and... Read more
BetterTouchTool 2.260 - Customize Multi-...
BetterTouchTool adds many new, fully customizable gestures to the Magic Mouse, Multi-Touch MacBook trackpad, and Magic Trackpad. These gestures are customizable: Magic Mouse: Pinch in / out (zoom... Read more
Chromium 59.0.3071.115 - Fast and stable...
Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all Internet users to experience the web. Version 59.0.3071.115: This update has no Flash plug... Read more
SyncTwoFolders 2.2.3 - Syncs two user-sp...
SyncTwoFolders simply synchronizes two folders. It supports synchronization across mounted network drives and it is a possibility to run a simulation showing in a log what will be done. Please visit... Read more
Myriad 4.1 - $79.00
Myriad is, simply put, one of the best audio batch processors. Totally redesigned, it looks beautiful and delivers incredible performance. Let Myriad do the heavy lifting while you get back to doing... Read more
Suitcase Fusion 7 18.2.4 - Font manageme...
Suitcase Fusion 7 is the creative professional's font manager. Every professional font manager should deliver the basics: spectacular previews, powerful search tools, and efficient font organization... Read more
SoftRAID 5.6.1 - High-quality RAID manag...
SoftRAID allows you to create and manage disk arrays to increase performance and reliability. SoftRAID allows the user to create and manage RAID 4 and 5 volumes, RAID 1+0, and RAID 1 (Mirror) and... Read more
BetterTouchTool 2.25 - Customize Multi-T...
BetterTouchTool adds many new, fully customizable gestures to the Magic Mouse, Multi-Touch MacBook trackpad, and Magic Trackpad. These gestures are customizable: Magic Mouse: Pinch in / out (zoom... Read more

Latest Forum Discussions

See All

Ravenscroft 275 Piano (Music)
Ravenscroft 275 Piano 1.0.0 Device: iOS Universal Category: Music Price: $35.99, Version: 1.0.0 (iTunes) Description: Experience the splendor of a Ravenscroft Grand with the most realistic sounding piano ever created for iOS. Launch... | Read more »
This War of Mine gets a new ending and m...
This War of Mine just got a big new update, featuring free DLC that adds a new ending to the game, among other exciting changes. The update is celebrating the game's two-year release anniversary. Apart from the new ending, which will be quite... | Read more »
Summon eight new heroes in Fire Emblem H...
Nintendo keeps coming at us with Fire Emblem Heroes updates, and it doesn't look like that trend is stopping anytime soon. The folks behind the game have just announced the new War of the Clerics Voting Gauntlet, expected to start next Tuesday. [... | Read more »
The best deals on the App Store this wee...
iOS publishers are pulling out all the stops this week -- there's a huge number of seriously great games at discounted prices this week. Let's not waste any time and get right down to business. [Read more] | Read more »
The House of da Vinci (Games)
The House of da Vinci 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: Enter The House of Da Vinci, a new must-try 3D puzzle adventure game. Solve mechanical puzzles, discover hidden... | Read more »
Solve the disappearance of history’s gre...
Blue Brain Games invites you to indulge in an immersive hands-on 3D puzzle adventure in similar vein to The Room series, with its debut release The House of Da Vinci. Set during the historic period of the Italian Renaissance (when Leonardo himself... | Read more »
Age of Rivals (Games)
Age of Rivals 3.3 Device: iOS Universal Category: Games Price: $.99, Version: 3.3 (iTunes) Description: Deep civilization-building strategy in a fast-paced card game! | Read more »
Panthera Frontier (Games)
Panthera Frontier 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: | Read more »
Angry Birds Evolution beginner's gu...
Angry Birds changes things up a fair bit in its latest iteration, Angry Birds Evolution. The familiar sling-shot physics mechanics are still there, but the game now features team-based gameplay, RPG elements, and a new top-down view. With all of... | Read more »
Sega Forever is for the retro game fans
Sega is launching a new retro games service titled Sega Forever, in a move that's sure to delight games enthusiasts with a bit of nostalgia. Sega's releasing five classic games for free. The titles include Sonic the Hedgehog, Phantasy Star II,... | Read more »

Price Scanner via MacPrices.net

Apple Releases iOS 11 Public Beta; How To Get...
The official release of Apple’s latest mobile operating system iOS 11 is vaguely slated for the fall, but as of June 26, ordinary users can download an iOS 11 public beta. To download the iOS 11... Read more
Extend Life of MacBook Pro Retina 2.0TB With...
MacSales.com/Other World Computing has announced availability of the new OWC 2.0TB Aura Pro Solid State Drive for mid-2012 to early 2013 Apple MacBook Pro with Retina display. One of the fastest... Read more
BBEdit SummerFest 2017 Discount Ends Friday,...
You can get 20% off BBEdit for a limited time in Bare Bones Software’s http://www.eastgate.com/Tinderbox/Specials/SummerFest.html?mc_cid=f2101ca260&mc_eid=[UNIQID]SummerFest 2017 sale and... Read more
Use Apple’s Education discount to save up to...
Purchase a new Mac using Apple’s Education discount, and take up to $300 off MSRP. All teachers, students, and staff of any educational institution qualify for the discount. Shipping is free: - 15″ 2... Read more
Clearance 27-inch 3.3GHz 5K iMac available fo...
Amazon clearance 27″ 3.3GHz 5K iMacs (MK482LL/A) available for $1799.90 including free shipping. Their price is $500 off original MSRP, and it’s the lowest price available for this model from any... Read more
13-inch 1.8GHz/256GB MacBook Air on sale for...
B&H Photo has the updated 2017 13″ 1.8GHz/256GB MacBook Air (MQD42LL/A) in stock and on sale for $1129 including free shipping plus NY & NJ tax only. Their price is $70 off MSRP. Read more
27-inch 3.4GHz iMac on sale for $1699, save $...
B&H Photo has the new 2017 27″ 3.4GHz iMac (MNE92LL/A) in stock and on sale for $1699 including free shipping plus NY & NJ sales tax only. Their price is $100 off MSRP. Read more
21-inch 2.3GHz iMac on sale for $1049, save $...
B&H Photo has the new 2017 21″ 2.3GHz iMac (MMQA2LL/A) in stock and on sale for $1049 including free shipping plus NY & NJ tax only. Their price is $50 off MSRP. Read more
ABBYY TextGrabber 6 for iOS Implements Instan...
ABBYY has announced the release of TextGrabber 6.0.0, an important feature update to the company’s productivity app developed for iOS and Android devices. TextGrabber 6.0 now offers Real-Time... Read more
vPhone, First Smartphone That Can’t Be Lost,...
Austin, Texas based Hypori has introduced the vPhone, a virtual smartphone that affords every business user the benefits of separate work and personal phones, conveniently delivered on a single... Read more

Jobs Board

*Apple* News Product Marketing Mgr., Publish...
…organizational consensus on strategy and vision for publisher tools, authoring, and Apple News Format.Carries this strategy and vision across the organization to Read more
*Apple* Retail - Multiple Positions - Apple,...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Security Data Analyst - *Apple* Information...
…data sources need to be collected to allow Information Security to better protect Apple employees and customers from a wide range of threats.Act as the subject matter Read more
Lead *Apple* Solutions Consultant - Apple I...
…integrity, and trust.Success Metrics/Key Performance Indicators:Quantitative* Year over Year growth in Apple Product and Beyond the Box sales in the assigned Point of Read more
*Apple* Solutions Consultant till v%u00E5r...
…ethics, integrity, and trust.Success Metrics/Key Performance Indicators:QuantitativeYear over Year growth in Apple Product and Beyond the Box sales in the assigned Point Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.