TweetFollow Us on Twitter

Custom Input Dialog
Volume Number:1
Issue Number:8
Column Tag:Pascal Procedures

"Custom Dialog Box for Input"

By Alan Wootton, President, Top-Notch Productions, MacTutor Contributing Editor

Our Project for this month is to create a pair of input statements for MacPascal. In Basic, there is a command that prompts the user for a number or a string. It would be nice to have this for MacPascal, but would be even better if it could be implemented using the excellent MacIntosh user interface. Towards this end, we will be using the Dialog Manager, Package 7, and Resources.

Resources

Previous generations of computers provided only files as storage entities. Any small or large chunk of numbers to be accessed by the operating system usually required a file to hold it. If a program needed a large number of small data areas the result was usually a large number of files. This happened all too often.

The Mac is different. On the Mac a file name actually represents two files. One of these is the usual type of file, the other is full of tiny subfiles. A whole new world! Naturally, there is a sort of directory to go with these subfiles.

Inside Mac calls the two files "forks" of a file. The subfiles are "resources" and the directory is the "resource map". In a normal file system all files are referred to by name and possibly a version number. Resources are referred to by a four character name called the "TYPE" (actually any longint) and an integer known as the "ID number". Many of the ROM routines access a particular TYPE with the ID being variable. For instance, a menu can be created by providing a number and the Menu Manager will access the resource with TYPE='MENU' and the ID provided.

File access can be quite a programming hassle, so you are probably imagining that resource access is even worse. Not true. There is no way to read in only part of a resource, so the subtleties of file i/o can be ignored. You provide a name and the resource manager will open the file for you. When you provide a TYPE and an ID the resource manager will search the maps that are open, read the data in, if necessary, and return a handle to that data. There are some fine points concerning control over when the data is read in, when it is to be purged from memory, which heap it goes on, and others. For our purposes it is enough to just open the file.

Resource Tools

Every computer has some sort of software to manipulate and view the files, so what does one use for resources? There are four tools from Apple to work with resources.

The simplest is RMover. RMover will simply list the resources in a file. You may also cut and paste resources between files. RMover will recognize some types as probably having a certain form of data and display it appropriately. Examples are STR (a string), PICT (a picture), ICON (an icon). In each case the data is simply so many bytes, but it is assumed that a particular type is used exclusively for a single brand of data (which is not a law). Every Mac freak should rummage through the files on his disks with RMover to get a feel for what is there (check out MacPascal!).

For programming, the next most useful tool is RMaker. This is a sort of compiler for resources. It knows the form of the data for windows, menus, dialog boxs, and more. Make a text file with coded descriptions in it, run RMaker and a new file is created with the described resources in it. RMaker is supplied with the MDS assembler from Apple and with some compilers (note: MDS is now shipping and includes a copy of Inside Macintosh). Get a copy of RMaker as soon as possible (there is a 10 page document you'll also need).

Recently, two editors of resources have become available. These are "Resource Editor" and "Redit". Both will edit resource data, often in a friendly format. For instance, the Resource Editor will allow you to edit an icon fatbits style and not as 128 bytes.

If you bought Inside MacIntosh and the software supplement these tools were sent to you. If not, there are still some places to get them. MacTutor Utility disk #1 has resource tools (see inside front cover for ordering).

The Dialog Manager

Now we will get back to the problem at hand: how to make a box that asks for input. What we ultimately need is a window (which has a grafport) and some controls. We also will need to use the text editor to edit the input data. If it weren't for the Dialog Manager this would be real work. Fortunately, the Dialog Manager will perform all of these chores for us. I won't go too deeply into this because that is what IM is for, but all you have to do is give the dialog manager an id to a resource of type DLOG and, assuming that the data is in the correct form, everything is automatic.

Classy_Input.R

The first step in our project is to create a file with three resources in it. Type Classy_Input.r (below) into a text file and apply RMaker to it. After that, use RMover to look and see if the resources exist in the file as planned. If you don't have RMaker you might try making the file with Resource Editor. If there is a lot of trouble creating this file, (it's important) write to me care of MacTutor and I will do a resource creation project. Actually, we should use RMaker input files as the official resource specification and exchange method.

Classy_Input.Pas

Next, boot MacPascal and type in Classy_Input.pas (below). This is a very simple program. First we open our resource file. The dialog box is created by GetNewDialog, operated by ModalDialog, and erased by DisposDialog. Simple! Of course, I've gotten fancy and used GetDItem and SetIText to change the text of some items. It is also necessary to use a GetDItem-GetIText combination to get the text from the edittext item. With these same simple routines it is possible to do much more elaborate dialogs. As a matter of fact, you can completely change the appearance of this example by merely changing the resource specification. Note that this is the same method used by real Mac applications and is not just a kludge for educational purposes.

You may omit Prompt_For_Number at first if you wish. After you have Prompt_for_String working you may wish to try for numbers. The prompt for strings looks like that shown at the top of the next column.

Fig. 1 Program Sample

To use this same box to prompt for numbers we will use Package #7. To access a package you use it's inline trap and leave a selector on the stack: eg. inlineP(TRAP,selector). However, Pack#7 is register based so it is necessary to use the register based interface that I presented in MacTutor No.6.

GetNewDialog accesses resource DLOG 12345 and DITL 12345 in order to determine the characteristics of the box it will make. Pack#7 loads resource PACK 7 (in the file "System"), locks it on the heap and then calls it as a procedure (we will call our own procedures the same way in later articles). By far the simplest of the resource-using toolbox routines is GetString:

 
procedure GetString(ID:integer):Handle;
begin 
 GetString:=GetResource('STR ',ID);
end
 

This also one of the simplest traps of any kind. All text of any kind should be in resources for later translation. This is the reason we use GetString, and also the reason we use GetNewDialog and not NewDialog. You should take up the habit of using resources this way,too.

Classy_Input.R
;;     *********************************************
;;     **                                                            
                      **
;;    **    Resource data for Classy_Input         **
;;    **                                                             
                      **
;;    **    Process this TEXT file through           **
;;    **    RMaker:the Resource Compiler        **
;;    **     by Andy Hertzfeld.                                    **
;;    **                                                             
                     **
;;    *********************************************
;;     double semicolons start comments
;;
MacTutor_disk:Classy_Input.rsrc;;
????????               
;; destination volume:filename 
;; type and creator of file = ???? ????

;;        ****************************************
;;        **  The first resource is the                  **
;;        **  definition of a Dialog Manager    **
;;        **  window.                                                
   **
;;       ****************************************
;;  global coordinates !!

type DLOG
box,12345
;;  note we have no title
96 128 148 384          ;; top left bottom right 
visible goaway
1                                          ;; window type = dBoxProc 

0                                          ;; refcon
12345                             ;; ID of DITL associated
                                            ;; with this DLOG

;;       ****************************************
;;       **      Next is a list of 'items' to go       **
;;       **       in the window.                                 **
;;       ****************************************

type DITL                            ;; see Dialog Manager
items,12345
4                                               ;; four items 

Button
4 120 24 180                    ;;  local coordinates !!
OK;;

Button
4 188 24 248
Cancel;;

EditText Disabled  
32 8 48 248        
;;;;;;;;;;;;;;;;;;text added later 

StaticText Disabled  
4 8 20 120           
Type a String         ;; prompt text, modified later

;;      disabled means that the Dialog Manager
;;      will not report events in this control
;;
;;          *********************************************
;;          **     And finally, the prompt used by        **
;;          **    Prompt_For_Number                              **
;;          *********************************************

type STR 
prompt,12345
Type a number

;;         ****************************************
;;         **  end of file                                           
     **
;;         ****************************************


Classy_Input.pas
program Classy_Input_test;{ by Alan Wootton 5/85 }
 type
  Ptr = ^integer;
  Handle = ^Ptr;
  StrPtr = ^str255;

 var{ for test, not a part of final logic }
  rid : integer;
  number : longint;
  words : str255;

 function Prompt_for_Str (prompt, sample : str255) :
                                          str255;
  var
   DlogPtr : Ptr;
   itype, itemHit : integer;
   r : rect;
   itemH : Handle;
   tempStr : str255;

{ This uses DLOG ID=12345 and associated DITL with }
{ the same ID.  Items are: #1=OK , #2=Cancel, }
{ #3=result, #4=prompt.  First we will _GetDitem to }
{ obtain handle and then _SetIText. For item#3= result }
{ string, and item#4 = prompt string. This will leave }
{ itemH referring to result item. }
 begin
  DlogPtr:= pointer(LinlineF($A97C,12345,nil,pointer(-1))); 
{ _GetNewDialog }

  inlineP($A98D, DlogPtr, 4, @itype, @itemH, @r);
{ _GetDitem }
  if prompt <> '' then
   inlineP($A98F, itemH, @prompt);{ _SetIText }

  inlineP($A98D, DlogPtr, 3, @itype, @itemH, @r);
{ _GetDitem }
  if sample <> '' then
   inlineP($A98F, itemH, @sample);{ _SetIText }

  inlineP($A991, nil, @itemHit);
{ _ModalDialog, returns with 1 or 2 in itemHit }

  if itemHit = 2 then { if Cancel }
   tempStr := ''
  else {  if OK }
   inlineP($A990, itemH, @tempStr);
{ _GetIText  from item#3 }

  inlineP($A983, DlogPtr);{ _DisposDialog }
  Prompt_for_Str := tempStr;
 end;


 function Prompt_for_Number (sampN : longint) :
                                                                     
      longint;
  var
   sHan : ^StrPtr;
   str : str255;
   access : array[0..12] of integer;
   d0, a0 : longint;{ the 68000 registers }
{ What we will do here is convert the input number }
{ into a string and then pass it to Prompt_for_String. }
{ Then we convert the returned string into a number.  }
{ The conversions are done with  $A9EE=pack7 . }
{ See Packages. }
{ Access is a 2 register OS interface that we must }
{ use because the call is register based yet also requires}
{ for the selector (the 1 or 0) to be on the stack  }
{ (and 'Generic' won't do that) }
 begin
  stuffHex(@access, '2848548C41FA000C309F245F265F20522013FFFF224826804ED4');
  a0 := ord(@str);
  d0 := sampN;
  inlineP($4E75, 0, @d0, @a0, $A9EE, @access);
{ pack7,0  is _NumtoString }
{    Str is now the string of  sampN }

  sHan := Pointer(LinlineF($A9BA, 12345));
{ _Getstring, numeric prompt  }
  str := Prompt_for_Str(sHan^^, str);
{ Str is now new string,  convert d0 to num. } 
{ A0 is still @str }

  inlineP($4E75, 1, @d0, @a0, $A9EE, @access);
{ pack7,1  is _StringtoNum }
  Prompt_for_number := d0;
 end;


begin{  main procedure, used only to exercise }
{ procedures above. }

 rid := WinlineF($A997, 'MacTutor_disk:Classy_Input.rsrc');{ _OpenResFile 
}
{ this file is the output of Rmaker, we open it to access }
{ our resources }
 if rid < 0 then
  writeln('error opening file', rid)
 else
  begin
   words := Prompt_for_Str('Type a string', 'sample string');
   writeln(' the words returned are:', words);

   words := Prompt_for_Str('', '');{ no prompts }
   writeln(' the words returned are:', words);

   number := Prompt_for_Number(1234);
   writeln('the number returned is', number);
  end;
 inlineP($A99A, rid);{ _CloseResFile}
end.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Cyberduck 4.7 - FTP and SFTP browser. (F...
Cyberduck is a robust FTP/FTP-TLS/SFTP browser for the Mac whose lack of visual clutter and cleverly intuitive features make it easy to use. Support for external editors and system technologies such... Read more
Labels & Addresses 1.7 - Powerful la...
Labels & Addresses is a home and office tool for printing all sorts of labels, envelopes, inventory labels, and price tags. Merge-printing capability makes the program a great tool for holiday... Read more
teleport 1.2.1 - Use one mouse/keyboard...
teleport is a simple utility to let you use one single mouse and keyboard to control several of your Macs. Simply reach the edge of your screen, and your mouse teleports to your other Mac! The... Read more
Apple iMovie 10.0.8 - Edit personal vide...
With an all-new design, Apple iMovie lets you enjoy your videos like never before. Browse your clips more easily, instantly share your favorite moments, and create beautiful HD movies and Hollywood-... Read more
Box Sync 4.0.6233 - Online synchronizati...
Box Sync gives you a hard-drive in the Cloud for online storage. Note: You must first sign up to use Box. What if the files you need are on your laptop -- but you're on the road with your iPhone? No... Read more
Fantastical 2.0.3 - Create calendar even...
Fantastical 2 is the Mac calendar you'll actually enjoy using. Creating an event with Fantastical is quick, easy, and fun: Open Fantastical with a single click or keystroke Type in your event... Read more
The Hit List 1.1.14 - Advanced reminder...
The Hit List manages the daily chaos of your modern life. It's easy to learn - it's as easy as making lists. And it's powerful enough to let you plan, then forget, then act when the time is right.... Read more
Path Finder 7.1.4 - Powerful, award-winn...
Become a master of file management with Path Finder. Take full control over your file system. Save your time: compare and synchronize folders, view hidden files, use Dual Pane and full keyboard... Read more
PhotoStyler 6.8.2 - Add a sense of reali...
PhotoStyler is the easiest way to style your digital photos with your Mac. This simple, fast and accurate native solution combines the powers of Apple's core technologies with the flexibility and... Read more
Astropad 1.1 - Turn your iPad into a gra...
Note: Requires iPad companion app. ($24.99) Astropad transforms your iPad into a professional graphics tablet for your Mac. Use your iPad to draw directly into Photoshop and any other Mac creative... Read more

SoundHound + LiveLyrics is Making its De...
SoundHound Inc. has announced that SoundHound + LiveLyrics, will be one of the first third-party apps to hit the Apple Watch. With  SoundHound you'll be able to tap on your watch and have the app recognize the music you are listening to, then have... | Read more »
Adobe Joins the Apple Watch Lineup With...
A whole tidal wave of apps are headed for the Apple Watch, and Adobe has joined in with 3 new ways to enhance your creativity and collaborate with others. The watch apps pair with iPad/iPhone apps to give you total control over your Adobe projects... | Read more »
Z Steel Soldiers, Sequel to Kavcom'...
Kavcom has released Z Steel Soldiers, which continues the story of the comedic RTS originally created by the Bitmap Brothers. [Read more] | Read more »
Seene Lets You Create 3D Images With You...
Seene, by Obvious Engineering, is a 3D capture app that's meant to allow you to create visually stunning 3D images with a tap of your finger, and then share them as a 3D photo, video or gif. [Read more] | Read more »
Lost Within - Tips, Tricks, and Strategi...
Have you just downloaded Lost Within and are you in need of a guiding hand? While it’s not the toughest of games out there you might still want some helpful tips to get you started. [Read more] | Read more »
Entertain Your Pet With Your Watch With...
The Petcube Camera is a device that lets you use live video to check in on your pet, talk to them, and play with them using a laser pointer - all while you're away. And the Petcube app is coming to the Apple Watch, so you'll be able to hang out with... | Read more »
Now You Can Manage Your Line2 Calls With...
You'll be able to get your Line2 cloud phone service on the Apple Watch very soon. The watch app can send and receive messages using hands-free voice dictation, or by selecting from a list of provided responses. [Read more] | Read more »
R.B.I. Baseball 15 (Games)
R.B.I. Baseball 15 1.01 Device: iOS Universal Category: Games Price: $4.99, Version: 1.01 (iTunes) Description: The legendary Major League Baseball franchise returns to the diamond. Make History. ** ALL iPOD Touch, the iPad 2 and the... | Read more »
Here's How You Can Tell if an App W...
The Apple Watch is pretty much here, and that means a whole lot of compatible apps and games are going to be updated or released onto the App Store. That's okay though, beacause Apple has quietly updated their app description pages to make things... | Read more »
Forgotten Memories : Alternate Realities...
Forgotten Memories : Alternate Realities 1.0.1 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.1 (iTunes) Description: + REDUCED PRICE ONLY THE LAUNCHING WEEK + "The most exciting horror game of 2015." - AppSpy... | Read more »

Price Scanner via MacPrices.net

Heal to Launch First One-Touch House Call Doc...
Santa Monica, California based Heal, a pioneer in on-demand personal health care services — will offer the first one-touch, on-demand house call doctor app for the Apple Watch. Heal’s Watch app,... Read more
Mac Notebooks: Avoiding MagSafe Power Adapter...
Apple Support says proper usage, care, and maintenance of Your Mac notebook’s MagSafe power adapter can substantially increase the the adapter’s service life. Of course, MagSafe itself is an Apple... Read more
12″ Retina MacBook In Shootout With Air And P...
BareFeats’ rob-ART morgan has posted another comparison of the 12″ MacBook with other Mac laptops, noting that the general goodness of all Mac laptops can make which one to purchase a tough decision... Read more
FileMaker Go for iPad and iPhone: Over 1.5 Mi...
FileMaker has announced that its FileMaker Go for iPad and iPhone app has surpassed 1.5 million downloads from the iTunes App Store. The milestone confirms the continued popularity of the FileMaker... Read more
Sale! 13-inch 2.7GHz Retina MacBook Pro for $...
 Best Buy has the new 2015 13″ 2.7GHz/128GB Retina MacBook Pro on sale for $1099 – $200 off MSRP. Choose free shipping or free local store pickup (if available). Price for online orders only, in-... Read more
Minimalist MacBook Confirms Death of Steve Jo...
ReadWrite’s Adriana Lee has posted a eulogy for the “Digital Hub” concept Steve Jobs first proposed back in 2001, declaring the new 12-inch MacBook with its single, over-subscribed USB-C port to be... Read more
13-inch 2.7GHz Retina MacBook Pro for $1234 w...
Adorama has the 13″ 2.7GHz/128GB Retina MacBook Pro in stock for $1234.99 ($65 off MSRP) including free shipping plus a free LG external DVD/CD optical drive. Adorama charges sales tax in NY & NJ... Read more
13-inch 2.5GHz MacBook Pro available for $999...
 Adorama has the 13-inch 2.5GHz MacBook Pro on sale for $999 including free shipping plus NY & NJ sales tax only. Their price is $100 off MSRP. Read more
Save up to $600 with Apple refurbished Mac Pr...
The Apple Store is offering Apple Certified Refurbished Mac Pros for up to $600 off the cost of new models. An Apple one-year warranty is included with each Mac Pro, and shipping is free. The... Read more
Updated MacBook Price Trackers
We’ve updated our MacBook Price Trackers with the latest information on prices, bundles, and availability on 12″ MacBooks, MacBook Airs, and MacBook Pros from Apple’s authorized internet/catalog... Read more

Jobs Board

*Apple* Retail - Multiple Positions (US) - A...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Program Manager, *Apple* Community Support...
**Job Summary** Apple Support Communities ( discussions. apple .com) helps customers get the most from their Apple products and services by providing access to Read more
Project Manager / Business Analyst, WW *Appl...
…a senior project manager / business analyst to work within our Worldwide Apple Fulfillment Operations and the Business Process Re-engineering team. This role will work Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** As an Apple Solutions Consultant (ASC) you are the link between our customers and our products. Your role is to drive the Apple business in a retail Read more
Event Director, *Apple* Retail Marketing -...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global engagement strategy and team. Delivering an overarching brand Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.