TweetFollow Us on Twitter

Text Views
Volume Number:7
Issue Number:7
Column Tag:Jörg's Folder

Text Views and Forth News

By Jörg Langowski, MacTutor Editorial Board

“Multiple text views in MacApp”

First, I’d like to give the Forth users among you some good news and some bad news. The bad news first. Mach2 doesn’t work with System 7.0, and I can’t get hold of Palo Alto Shipping. If anyone of you out there knows how to contact them, if they’re still alive, etc., please drop me a note (Netland: langowski@frembl51.bitnet or langowski@embl-heidelberg.de, Applelink: langowski.j).

The good news is about Neon, the OOP Forth implementation by Kriya Systems. You might remember that Bob Loewenstein from the University of Chicago recently managed to persuade Kriya Systems to put Neon into the public domain - under the name of Yerk. Well, since then he has not been asleep and has made some improvements, right now we’re at Yerk version 3.3.2. Instructions on how to obtain the Yerk files are in the letter that arrived recently over E-Mail:

From:

Bob Loewenstein <rfl@ODDJOB.UCHICAGO.EDU>

Subject: yerk 3.3.2 upgrade

An upgraded version of Yerk, the Object Oriented Forth for the Mac, is available for anonymous ftp on oddjob.uchicago.edu, in directory ~ftp/pub/Yerk.

If you already have version 3.3.0, you need only ftp the ‘upgrade.sit.hqx’ file. If you do not have a previous version, ftp the complete package in file ‘yerk3.3.2.sit.hqx’. The manual has not been changed.

The basic changes from 3.3.0 are:

COSMETIC CHANGES

- revised bold fonts in // so 9 pt chicago not loaded

- class window now erases grow box when grown

- now cursor is erased with delete key if +curs is set

- slight cosmetic change to (.mod)

- slight change stop: timer

- ?lines changed in nuc to keep bottom line on screen

and grow: method in window changed to send current

line to bottom if grow shortened window.

BUG FIXES

- modified savesig

- added negate: to class Int

- fixed slight bug in decompile (for floats)

- fixed to: problem in pathList source for sarray (file

pathlist)

- some changes to Install Module..it still does not

create a stand-alone application, but does reset

dictionary and stack sizes

- slot manager traps now correct

I would appreciate a note from anyone who intends to seriously use this development system. Future upgrades will be forthcoming, and any reasonable suggestions will most likely be included in such upgrades.

Bob Loewenstein

Dept. of Astronomy and Astrophysics

University of Chicago

Yerkes Observatory

Williams Bay, Wisconsin 53191

414-245-5555

As usual, I’d be glad to help those who have difficulty downloading the Yerk source over the network. Drop me a line at one of my E-mail addresses.

The second good news comes from Michael Hore (Australia), of Mops fame (Mops = Michael’s object programming system). To remind you: Michael re-implemented Neon on top of a subroutine-threaded Forth kernel, with lots of inline code and other optimizations. A couple of days ago, his letter arrived:

Dear Jörg,

I was really please with the glowing report you gave about Mops in MacTutor of Oct last year. Several people in various parts of the world have since contacted me for copies of Mops. This is to let you know that I am just putting the finishing touches to Mops 2.0, and expect it to be available in a couple of weeks now. Actually I am aiming to have it available by the time Apple releases System 7, but I think I might beat them to it (wouldn’t be too hard, would it?) [well, it seems once in a while Apple gets something out on a deadline - which has been pushed far enough, however. I remember MacHack 1989 when they were taking bets when System 7 was going to be released, Fall 89 or Spring 90, etc - JL].

With Kriya’s release of the source code of Neon, I am now free to offer Mops to anyone, not just Neon users. Although to really make it accessible to non-Neon users I should probably write a manual (ugh!).

Actually I note that the text of Kriya’s letter to Bob Loewenstein says that Neon is released for “scientific and educational purposes All commercial distribution rights are reserved by Kriya Systems, Inc.” This, of course, isn’t exactly public domain. It means that if a non-Neon owner wanted to do something commercial in Mops, and Mops still contained any of Kriya’s source code, I would have to negotiate a separate agreement with Kriya, somehow

Still, to be realistic, I doubt that any non-Neon owner would want to use it for a commercial project at this stage, although there is a Neon owner here in Australia who is going to use it commercially. Eventually there will be none of Kriya’s code left, and then there will be no problem. The nucleus and most of the standard system stuff is original right now - only the language itself is closely derived from Neon, and my understanding of the legalities is that a language, as such, isn’t copyrightable.

Anyway, this release will have quite a number of improvements:

• Mops will be fully System 7 friendly. All the new system calls will be available through the normal Call xxxx syntax. (I’ve discovered, incidentally, that Neon won’t run under System 7 - there’s a problem with the way it resizes itself in memory on startup).

• Up to 24 named parameters/local variables. This used to be 6 in Neon, 5 in Mops.

• The Assembler will support the 68881/2 FPU instructions.

• Mops already has Neon-compatible floating point - in the new version, FP words test a flag for the presence of an FPU, and if it is present, these words bypass SANE. This gives around a 400% speedup. Mops will also optionally compile inline optimized FPU code. If this mode is selected, up to 6 floating point named parameters or locals will be kept in the FPU registers. This results in some rather swift floating-point code (10 to 20 times faster than SANE). This is probably as quick as anything on the Mac, if not quicker.

• No limit on dictionary size.

When this version is available I’ll send you a copy, which you can distribute [Sure will! - JL] or whatever. As always, anyone who sends me two blank disks will get a copy (or if they put something else useful on the disks, I won’t complain).

Yours sincerely,

Michael Hore

(c/o MAF, P.O. Box 821, Nhulunbuy, NT 0880, Australia)

So you see, the OOP Forth scene for the Mac isn’t anything like dead, but quite a few exciting things are still happening! If you are using any of those systems and have an idea for an article, I’d really appreciate your contributions.

Multi-box text editor

Now let’s go back to C++, MacApp, and this month’s main subject. We’ll extend the simple editor from the May column to accommodate several boxes containing some text, of different style. We also want a border drawn around each box, and the window in which the text boxes are displayed should be scrollable (you notice that with these additions we come closer to adding a ‘text box’ capability to our drawing example).

Anything that is to be scrolled in a MacApp window will be contained in a scroller view (class TScroller). This time we shall create the scroller from a view template that we define with ViewEdit; the scroller will contain two subviews of class TTEBox. This class is derived from the standard class TTEView. It implements its own Draw method which draws a box around the view, and a DoMouseCommand method which handles mouse clicks in the view.

The latter method is important for selecting the text box which will receive the keystrokes typed by the user; clicking in one text box should select that box (this is not an automatic feature of TTEView, but has to be programmed).

The Draw method (Listing 2) gets the extent rectangle of the view in QuickDraw format, and calls FrameRect, and the superclass Draw method. DoMouseCommand simply sends the SetTarget(this) message to the window enclosing the view, which means that keystrokes and DoIdle messages will be sent to this text view.

For the scroller enclosing the text boxes, we also derive a new class from TScroller, TEditView. This allows us to save references to the enclosed TTEBox objects (two in our case) in instance variables - you never know what you’ll be able to use them for. The only new method that we define for TEditView is IEditView, which initializes the print handler and the new instance variables, and sets the window’s target to the second text box (just for the fun of it).

The application’s class is TEditor. The constructor method of this class initializes the application and generates a new window containing the views as defined in a resource file that has been created by ViewEdit. The resource is ‘view’, ID=1002. This view contains one instance of TEditView, with identifier ‘scrl’, which in turn contains two instances of TTEBox as subviews, with identifiers ‘tx01’ and ‘tx02’.

Writing code like this where instances of views are generated from templates at run time requires some attention. If the class is never referenced explicitly in the source code, either by generating an instance using new, or by calling one of its methods, the linker will think that class’ code isn’t used and doesn’t need to be included in the application. Running the application will then generate an error message, because the code required to initialize the new object can’t be found anywhere. We therefore have to include dummy references to TEditView and TTEBox, to make sure we can instantiate the objects at run time. This is done in the code starting with if (gDeadStripSuppression) {}. Finally, we initialize the newly generated TEditView.

How do we generate the templates for our view in ViewEdit? First of all, we draw a TScroller of a certain size. We check the box ‘Top view in TWindow’ to indicate that the view is contained in a window, and then click on the button ‘TWindow parameters ’. This will open a dialog where we can set the window size. It should be 15 pixel bigger than the TScroller in either direction, to accommodate the scroll bars. Returning to the ViewEdit window, we double-click on the TScroller box, opening the dialog for the TScroller parameters. Here, we have to set the two size determiners to ‘sizeRelSuperView’, in order to make the scroll bars grow and shrink with the window. Finally, we find a text box where we can enter the class name. By default, this will be the name of the standard view that we generated (TScroller in this case). Entering another name here allows us to generate an object of a class derived from TScroller. Thus, here we enter TEditView, the name of our derived class. The view identifier, by default ‘VW01’, can be changed, too; I chose ‘scrl’.

Finally, we draw two TTEView boxes inside our TEditView (drawing them inside automatically makes them subviews), and change their class names to TTEBox, and the view identifiers to ‘tx01’ and ‘tx02’. We save the resource file and are ready to go. The view resource that I just described is contained on the source code disk as ‘editor.rsrc’.

We’re done; building the application will now create a program that displays one window, scrollable in both directions, in which two text edit boxes are displayed. Clicking on one of them allows you to enter text there. We’ll continue this example and see how we can add disk read/write; till then.

Listing 1: editor.h

class TEditor : public TApplication {
public:
 pascal TEditor(OSType itsMainFileType);
 pascal void HandleFinderRequest();
#ifdef qDebug
 virtual pascal void IdentifySoftware();
#endif
};

class TEditView : public TScroller {
public:
 TTEView*fTEView1;
 TTEView*fTEView2;
 pascal void IEditView(TWindow *itsWindow);
};

class TTEBox : public TTEView {
public:
 pascal void Draw(Rect *area);
 pascal struct TCommand 
 *DoMouseCommand(Point *theMouse,
 EventInfo *info, Point *hysteresis);
};
Listing 2: editor.cp

#include <UMacApp.h>
#include <UPrinting.h>
#include <UTEView.h>
#include <Fonts.h>
#include <ToolUtils.h>

#include “editor.h”

const OSType kSignature   = ‘JLMT’;
const OSType kFileType    = ‘JL01’;
const int kWindowID= 1002;

pascal TEditor::TEditor(OSType itsMainFileType)
{
 TWindow*aWindow;
 TEditView*aEditView;
 TTEBox *aTEBox;
 
 IApplication(itsMainFileType);

 aWindow = NewTemplateWindow(kWindowID,nil);
 FailNIL(aWindow);
 
 if (gDeadStripSuppression)
 {
 aEditView = new TEditView;
 aTEBox = new TTEBox;
 }

 aEditView = 
 (TEditView*) aWindow->FindSubView(‘scrl’);
 FailNIL(aEditView);
 aEditView->IEditView(aWindow);
 
 aWindow->Open();
}

pascal void TEditor::HandleFinderRequest()  {};

#ifdef qDebug
pascal void TEditor::IdentifySoftware()
{
 ProgramReport
 (“\pEditor ©J.Langowski/MacTutor May 1991”,false);
 inherited::IdentifySoftware();
}
#endif

pascal void TEditView::IEditView(TWindow *itsWindow)
{
 TStdPrintHandler*aStdPrintHandler;
 
 aStdPrintHandler = new TStdPrintHandler;
 FailNIL(aStdPrintHandler);
 aStdPrintHandler->IStdPrintHandler
 (nil,this,kSquareDots,kFixedSize,!kFixedSize);
 fPrintHandler = aStdPrintHandler;

 fTEView1 = 
 (TTEView*) itsWindow->FindSubView(‘tx01’);
 FailNIL(fTEView1);
 fTEView2 = 
 (TTEView*) itsWindow->FindSubView(‘tx02’);
 FailNIL(fTEView2);
 
 itsWindow->SetTarget(fTEView2);
}

pascal void TTEBox::Draw(Rect *area)
{
 Rect itsQDExtent;
 
 PenNormal();
 GetQDExtent(&itsQDExtent);
 FrameRect(&itsQDExtent);
 inherited::Draw(area);
}

pascal struct TCommand 
 *TTEBox::DoMouseCommand(Point *theMouse,
 EventInfo *info, Point *hysteresis)
{
 if (Focus())
   {  GetWindow()->SetTarget(this); }

 return inherited::DoMouseCommand
 (theMouse,info,hysteresis);
}

TEditor *gEditor;

int main()
{
 InitToolBox();
 if (ValidateConfiguration(&gConfiguration))
 {
 InitUMacApp(8);
 InitUPrinting();
 InitUTEView();
 gEditor = new TEditor(kFileType);
 FailNIL(gEditor);
 gEditor->Run();
 }
 else StdAlert(phUnsupportedConfiguration);
 return 0;
}
Listing 3: editor.r

/* editor.r 
 Rez file for MacTutor C++/MacApp Editor example
 J. Langowski May 1991
*/

#ifndef __TYPES.R__
#include “Types.r”
#endif

#ifndef __SYSTYPES.R__
#include “SysTypes.r”
#endif

#ifndef __MacAppTypes__
#include “MacAppTypes.r”
#endif

#ifndef __ViewTypes__
#include “ViewTypes.r”
#endif

#if qDebug
include “Debug.rsrc”;
#endif

include “MacApp.rsrc”;
include “Printing.rsrc”;

include “Defaults.rsrc” ‘SIZE’(-1);
include “Defaults.rsrc” ‘ALRT’(phAboutApp);
include “Defaults.rsrc” ‘DITL’(phAboutApp);
include “Defaults.rsrc” ‘cmnu’(mApple);
include “Defaults.rsrc” ‘cmnu’(mEdit);
include “Defaults.rsrc” ‘cmnu’(mBuzzWords);

include “Editor” ‘CODE’;

include “editor.rsrc”;

#define kSignature ‘JLMT’
#define kDocFileType ‘JL01’
#define getInfoString“©1991 J.Langowski/MacTutor. “

/* ------------------------------------------------------------------------*/

resource ‘cmnu’ (2) {
 2,
 textMenuProc,
 allEnabled,
 enabled,
 “File”,
  {
 “Close”, noIcon, noKey, noMark, plain, 31;
 “-”, noIcon, noKey, noMark, plain, nocommand;
 “Page Setup ”, 
 noIcon, noKey, noMark, plain, 176;
 “Print One”, noIcon, “P”, noMark, plain, 177;
 “Print ”, noIcon, noKey, noMark, plain, 178;
 “-”, noIcon, noKey, noMark, plain, nocommand;
 “Quit”, noIcon, “Q”, noMark, plain, 36
 }
};


resource ‘MBAR’ (kMBarDisplayed,purgeable) 
{
 {mApple; 2; mEdit;}
};


/*--------------------------------------------------------------------------
 The overall package version
----------------------------------------------------------------------------*/
RESOURCE ‘vers’ (2,
#if qNames
“Package Version”,
#endif
 purgeable) {
 0x02,
 0x00,
 beta,
 0x06,
 verUs,
 “2.0”,
 “MacApp® 2.0, ©Apple Computer, Inc. 1990”
};


/*--------------------------------------------------------------------------
 The revision of this particular file
--------------------------------------------------------------------------*/
RESOURCE ‘vers’ (1,
#if qNames
“File Version”,
#endif
 purgeable) {
 0x01,
 0x00,
 beta,
 0x05,
 verUs,
 “Editor”,
 “v 0.9, ©JL/MacTutor 1991”
};

/* =========== debug window ============ */
resource ‘dbug’ (kDebugParamsID,
#if qNames
“Debug”,
#endif
 purgeable) {
 {350, 4, 474, 636}, /* Bounding rect for debug window */
 1,   /* Debug window font rsrc ID (normal = monaco) */
 9,/* Debug window font size (normal = 9) */
 100, /* Number of lines */
 100, /* Width of lines in characters */
 true,  /* open initially */
 “Jörg’s Debug Window”  /* Window title */
};

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Apple iOS 11.2.6 - The latest version of...
iOS 11 sets a new standard for what is already the world’s most advanced mobile operating system. It makes iPhone better than before. It makes iPad more capable than ever. And now it opens up both to... Read more
EtreCheck 4.0.3 - For troubleshooting yo...
EtreCheck is an app that displays the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to... Read more
Opera 51.0.2830.34 - High-performance We...
Opera is a fast and secure browser trusted by millions of users. With the intuitive interface, Speed Dial and visual bookmarks for organizing favorite sites, news feature with fresh, relevant content... Read more
ffWorks 1.0.6 - Convert multimedia files...
ffWorks (was iFFmpeg), focused on simplicity, brings a fresh approach to the use of FFmpeg, allowing you to create ultra-high-quality movies without the need to write a single line of code on the... Read more
Adobe Photoshop CC 2018 19.1.1 - Profess...
Photoshop CC 2018 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Photoshop customer). Adobe Photoshop CC 2018, the industry standard... Read more
Google Chrome 64.0.3282.167 - Modern and...
Google Chrome is a Web browser by Google, created to be a modern platform for Web pages and applications. It utilizes very fast loading of Web pages and has a V8 engine, which is a custom built... Read more
Adobe Acrobat Reader 18.011.20035 - View...
Adobe Acrobat Reader allows users to view PDF documents. You may not know what a PDF file is, but you've probably come across one at some point. PDF files are used by companies and even the IRS to... Read more
Adobe Acrobat 18.011.20035 - Powerful PD...
Acrobat DC is available only as a part of Adobe Creative Cloud, and can only be installed and/or updated through Adobe's Creative Cloud app. Adobe Acrobat DC with Adobe Document Cloud services is... Read more
Yummy FTP Pro 2.0 - $29.99
Yummy FTP Pro is an advanced Mac file transfer app which provides a full-featured professional toolkit combined with blazing speeds and impeccable reliability, so whether you want to transfer a few... Read more
WebSnapperPro 2.0.5 - $20.00
WebSnapperPro lets you capture full web pages exactly as they appear in your browser, with a single mouse click, without the need to "stitch" or cut-and-paste. Save the page as an image file or as... Read more

Latest Forum Discussions

See All

Check out these 5 games that are a lot l...
So you're in love with Minecraft, but you're looking for something else to play as well? You've come to the right place then, because this list is all about games that are a bit like Minecraft. Some of them, more than others. [Read more] | Read more »
Our top 5 characters from casual RPG Cre...
Creature Quest definitely lives up to its name with a host of collectible creatures based on fantasy tales and world mythologies. To celebrate Creature Quest’s first birthday, we’re going to lay out what we think are the five best characters in the... | Read more »
Around the Empire: What have you missed...
Did you know that Steel Media has a whole swathe of other sites dedicated to all aspects of mobile gaming? Sure you'll get the very best iPhone news, reviews, and opinions right here at 148Apps, but we don't want you missing out on a single piece... | Read more »
All the best games on sale for iPhone an...
Oh hi there, and welcome to our round-up of the best games that are currently on sale for iPhone and iPad. You thought I didn't see you there, did you, skulking behind the bushes? Trust me though, the bushes aren't where the best deals are. The... | Read more »
The Battle of Polytopia Guide - How to H...
A new update just released for The Battle of Polytopia (formerly Super Tribes), which introduces online multiplayer. For all the fans of Midjiwan’s lite take on Civilization, this is certainly welcome news, but playing online isn’t as easy and... | Read more »
Here are the very best mobile games to p...
It's Valentine's Day! Did you get loads of cards and chocolates and other tacky, simple expressions of human affection? Did you send out tat because you find it almost impossible to express emotion unless there's a section dedicated to it at your... | Read more »
Florence (Games)
Florence 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: Florence is an interactive storybook from the award-winning lead designer of Monument Valley about the heart-racing highs and... | Read more »
Purrfect Date (Games)
Purrfect Date 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: Cats are a lil’ like marmite. Either you absolutely head-over-heels love’ em, or… nahhh, who are we kidding?! Everyone... | Read more »
More monsters to collect and evolve in C...
A laid-back mix of RPG and TCG, Creature Quest is all about building your deck, evolving your creatures and winning in battle. It’s the creation of VC Mobile, set up by Might and Magic producer Jon Van Caneghem. There are elements of that classic... | Read more »
Check out this awesome hands-on with the...
Well, PlayerUnknown's Battlegrounds has come out on mobile. This isn't a clone, this isn't a riff on the battleroyale mechanics of the game, it's the official mobile port by Tencent. But there's a little bit of a hitch. [Read more] | Read more »

Price Scanner via MacPrices.net

B&H offers $200 discount on Silver 15″ Ma...
B&H Photo has Silver 15″ Apple MacBook Pros on sale for $200 off MSRP. Shipping is free, and B&H charges sales tax for NY & NJ residents only: – 15″ 2.8GHz Touch Bar MacBook Pro Silver (... Read more
12″ Apple iPad Pro Sale of the Year! Models u...
B&H Photo has 12″ #iPad Pros on sale for up to $150 off MSRP. Shipping is free, and B&H charges sales tax in NY & NJ only: – 12″ 64GB WiFi iPad Pro: $719 $80 off MSRP – 12″ 256GB WiFi... Read more
Deals on 32GB 9″ iPads: Up to $50 off MSRP, s...
B&H Photo has 2017 9.7″ 32GB iPads on sale for $299 including free shipping plus NY & NJ sales tax only. Their price is $30 off MSRP, and it’s currently the lowest price available for these... Read more
15″ 2.2GHz Retina MacBook Pro available for o...
Apple has Certified Refurbished 15″ 2.2GHz Retina MacBook Pros available for $1699. That’s $300 off MSRP for this model, and it’s the lowest price available for a 15″ MacBook Pro currently offered by... Read more
13″ 3.1GHz/256GB Silver Touch Bar MacBook Pro...
Amazon has the Silver 13″ 3.1GHz/256GB Touch Bar MacBook Pro (MPXX2LL/A) on sale for $1649.99 including free shipping. Their price is $150 off MSRP, and it’s the lowest price available for a new 13″... Read more
Saturday Sale: Amazon offers 13″ 1.8GHz/256GB...
Amazon has the 13″ 1.8GHz/256B Apple MacBook Air on sale today for $250 off MSRP including free shipping: – 13″ 1.8GHz/256GB MacBook Air (MQD42LL/A): $949.99, $250 off MSRP Their price is the lowest... Read more
Roundup of Apple Certified Refurbished 12″ Ma...
Apple has Certified Refurbished 2017 12″ Retina MacBooks available for $200-$240 off the cost of new models. Apple will include a standard one-year warranty with each MacBook, and shipping is free.... Read more
Apple offers Certified Refurbished 10″ and 12...
Apple is now offering Certified Refurbished 2017 10″ and 12″ iPad Pros for $100-$190 off MSRP, depending on the model. An Apple one-year warranty is included with each model, and shipping is free: –... Read more
Apple Canada offers Certified Refurbished Mac...
 Canadian shoppers can save up to $560 on the purchase of a 2017 current-generation MacBook Pro, MacBook, or MacBook Air with Certified Refurbished models at Apple Canada. Apple’s refurbished prices... Read more
Sale! 13″ MacBook Airs for up to $180 off MSR...
B&H Photo has 13″ MacBook Airs on sale for $50-$120 off MSRP. Shipping is free, and B&H charges sales tax for NY & NJ residents only: – 13″ 1.8GHz/128GB MacBook Air (MQD32LL/A): $899, $... Read more

Jobs Board

*Apple* Store Leader - Retail District Manag...
Job Description:Job SummaryAs more and more people discover Apple , they visit our retail stores seeking ways to incorporate our products into their lives. It's your Read more
*Apple* Retail - Multiple Positions - Apple,...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, 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
*Apple* Retail - Multiple Positions - Apple,...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, 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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.