TweetFollow Us on Twitter

Two Editors
Volume Number:7
Issue Number:5
Column Tag:Jörg's Folder

Two Simple Editors

By Jörg Langowski, MacTutor Editorial Board

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

“Two simple editors”

If you’ve read enough about drawing shapes in windows under MacApp, here’s a little break. In fact, the next feature that I wanted to add to the drawing example was to put text boxes into the document. I soon found out that in order to do that in a clean way, one needs to understand the view architecture of MacApp a little better. In order to do that, we’ll diverge from our previous example and look at two small text editor programs.

Views

A view - in the MacApp perspective - is anything that is displayed on a screen. Thus, a window by itself is a view. Anything that is displayed in that window is also a view. Views depend on each other in a hierarchical way; if you display some editable text, some controls and a list in a window, these items will be subviews of the main window view. Each subview can again display other views, which will then depend on that subview, and so on.

In our example, we display editable text in a window. The view class used for displaying a TextEdit record is called TTEView. Our window will contain one subview of this class. MacApp provides a function which creates a window with its associated view hierarchy from a template which is stored in a ‘view’ resource. In our example (see listing 1&2) NewTemplateWindow (kWindowID, itsDocument) will create a TextEdit window that responds in the usual way to keyboard input, menu commands like Cut, Copy and Paste, and changes the cursor to an I-bar when it is over the TextEdit rectangle in the window. We have set itsDocument to nil because we do not want a document to be associated with the view. We’ll talk about how to add documents next time.

We’ll see soon how one creates the view resource, for the moment look at the program example and see with how little code you can program a functioning text editor in MacApp. It won’t read or write files yet, neither will it scroll or change the text style (functions that we’ll add later), but it will print its text.

The listing shows that all the important functionality of the window (and therefore of the program) is contained in the constructor routine of the TEditor class, of which our application is an instance (yes, we are finally using constructors in C++/MacApp, instead of the initialization methods that were inherited from Pascal). The application’s window is created by NewTemplateWindow, and the TTEView instance is created from its view hierarchy through the MacApp routine FindSubView, which finds a subview by its name.

ViewEdit

So how did we generate the template for our window and the TTEView? MacApp 2.0 provides a wonderful tool, ViewEdit. With this program, you generate a view hierarchy just by drawing it. I cannot go into all the details of that program; the screen image below shows how a typical dialog looks like that is used to change the parameters of a view; in this case, our TTEView.

You see from the dialog which parameters can be controlled through the view template: the upper part of the dialog shows all the attributes of the TTEView, such as fonts, justification, etc., and the lower part controls the superclass (TView) parameters. There, we can name the view template (‘edit’), and determine where it is located in the window and how it responds to resizing of the superview. Through a similar dialog we can control the initialization of the main window. The view resource that we created in this way is added to our program.

Other resources that we may need (size, dialogs, etc.) are contained in the file ‘Defaults.rsrc’ in the MacApp library. The editor.r Rez file takes some resources from that file, and also defines the File menu. The actual C++ program is only about a page long.

Scrolling the text

The template window created in the first example does not scroll the text. We can add scrolling through several different routes: there exists a TScroller class, which can be a subview of our window and in turn contain the TTEView as a subview. We’ll talk about that class in a later column; for a very simple scrolling editor, we can create a window that contains one scrollable view using the function NewSimpleWindow (Listing 4). This routine creates a MacApp window from a WIND resource and adds optionally scrollbars. One parameter to the routine is the view that is to be displayed in the window.

Thus, for the second editor example, we create a simple TTEView template with ViewEdit, name it ‘text’ (why not?) and save it in a view ID=1002 resource which will be copied into our program file. DoCreateViews (Listing 4) will create the view hierarchy corresponding to that resource ID, in our case only one TTEView. Its parameters are the associated document (nil here), the superview (also nil), the view resource ID, and the offset of the view inside its superview (no offset here). gZeroVPt is a (0,0) point in the 32-bit coordinate system that is used by MacApp views.

We then call NewSimpleWindow, with parameters that indicate the window ID, whether or not we want horizontal or vertical scrollbars, the document that is supposed to be displayed in the TTEView (nil, because we are not handling documents in this example), and the view to be displayed.

With these changes, our editor will also scroll the text. It prints already, so all we need to add is file handling. We’ll do that in the next column.

Forth news

A reader who downloaded Yerk (the public-domain NEON successor which I wrote about some months ago), complained about some bugs that seem to have perpetuated from the original NEON. Walter Kulecz <wkulecz@medics.span.nasa.gov> writes:

” Is YERK worth the trouble to learn? Reading the documentation suggested it might be, having source code is a BIG PLUS!, but playing with the command window suggests it might not be.

Problems:

Command window doesn’t update if something pops up in front of it. This I can live with. Backspacing the cursor leaves underlines where it was. Again, no real problem but we’re beginning to look ugly. Zoom to full screen. Note the right hand control border and part of the growbox pollute the new bigger screen. Real Ugly. The real bad news is if your vertical pixel count is not a multiple of your font character height, as once the screen starts scrolling, the characters are clipped and unreadable after scrolling! Presumably this uses the allegedly improved OOPS paradigm in its implementation, so this bug/feature would be inherited by everything else, which of course suggests .... why bother?

I’d like to believe. I don’t have time to dink around. Answer me back with your opinion of the “best” example program I should play with to be convinced that YERK is worth while. I may have jumped to a hasty conclusion, but I always give things a second chance. ”

It is true that the bugs you have discovered make the command window look a little ugly, and they were there in the original NEON from the beginning. However, that should not discourage you from trying out Yerk; the Window class has not much to do with the way the NEON - oops, Yerk - interpreter writes its output into the window. You can define your window’s behavior in any way you like. If you have already a big investment into a development in some other language, you are probably not going to rewrite everything in Yerk.

However, as stated here repeatedly, Yerk/NEON is one of the best ways to study and understand object-oriented programming. It was my first exposure to OOP, and has certainly helped me a great deal in understanding other implementations, such as MacApp. For most of you interested in Forth and OOP, Yerk will be a terrific teaching tool, and for some, a tool to create great applications.

See you next month.

Listing 1: editor.h

class TEditor : public TApplication {
public:
 pascal TEditor(OSType itsMainFileType);
 pascal void HandleFinderRequest();
#ifdef qDebug
 virtual pascal void IdentifySoftware();
#endif
};
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= 1001;

pascal TEditor::TEditor(OSType itsMainFileType)
{
 TTEView*aTEView;
 TStdPrintHandler*aStdPrintHandler;
 TWindow*aWindow;
 
 IApplication(itsMainFileType);
 
 aWindow = NewTemplateWindow(kWindowID,nil);
 FailNIL(aWindow);
 aTEView = (TTEView*) aWindow->FindSubView(‘edit’);
 FailNIL(aTEView);
 aStdPrintHandler = new TStdPrintHandler;
 FailNIL(aStdPrintHandler);
 aStdPrintHandler->IStdPrintHandler(
 nil,
 aTEView,
 kSquareDots,
 kFixedSize,
 !kFixedSize);
 aWindow->Open();
}

pascal void TEditor::HandleFinderRequest()  {};

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

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;} };

resource ‘vers’ (2,
#if qNames
“Package Version”,
#endif
 purgeable) {  0x02, 0x00, beta, 0x06, verUs, “2.0”,
 “MacApp® 2.0, ©Apple Computer, Inc. 1990”
};

resource ‘vers’ (1,
#if qNames
“File Version”,
#endif
 purgeable) { 0x01, 0x00, beta, 0x05, verUs, “Editor”,
 “v 0.8, ©JL/MacTutor 1991”
};

resource ‘dbug’ (kDebugParamsID,
#if qNames
“Debug”,
#endif
 purgeable) {
 {350, 4, 474, 636},
 /* Bounding rect for debug window */
 1,   /* Debug window font rsrc ID  */
 9,/* Debug window font size */
 100, /* Number of lines */
 100, /* Width of lines in characters */
 true, /* open initially */
 “Jörg’s Debug Window”  /* Window title */
};
Listing 4: editor2.h

class TEditor : public TApplication {
public:
 TTEView*fTEView;
 TStdPrintHandler*fStdPrintHandler;
 TWindow*fWindow;
 
 pascal TEditor(OSType itsMainFileType);
 pascal void HandleFinderRequest();
#ifdef qDebug
 virtual pascal void IdentifySoftware();
#endif
};
Listing 5: Changed routines for editor2.cp

#include “editor2.h”

const int kTEViewID= 1002;
pascal TEditor::TEditor(OSType itsMainFileType)
{
 IApplication(itsMainFileType);
 
 fTEView = (TTEView*) 
 DoCreateViews(nil,nil,kTEViewID,&gZeroVPt);
 FailNIL(fTEView);

 fWindow = NewSimpleWindow(kDefaultWindowID, 
 kWantHScrollBar,kWantVScrollBar, nil, fTEView);
 FailNIL(fWindow);

 fStdPrintHandler = new TStdPrintHandler;
 FailNIL(fStdPrintHandler);

 fStdPrintHandler->IStdPrintHandler( nil, fTEView,
 kSquareDots,kFixedSize,!kFixedSize);
 
 fWindow->SetTitleForDoc
 (“\pMacTutor Editor Window”);
 fWindow->Open();
}
Listing 6: Changes from editor.r to editor2.r

include “Defaults.rsrc” ‘WIND’(kDefaultWindowID);
include “Editor2” ‘CODE’;
include “editor2.rsrc”;


 

Community Search:
MacTech Search:

Software Updates via MacUpdate

CrossOver 14.1.3 - Run Windows apps on y...
CrossOver can get your Windows productivity applications and PC games up and running on your Mac quickly and easily. CrossOver runs the Windows software that you need on Mac at home, in the office,... Read more
Little Snitch 3.5.3 - Alerts you about o...
Little Snitch gives you control over your private outgoing data. Track background activity As soon as your computer connects to the Internet, applications often have permission to send any... Read more
OmniGraffle Pro 6.2.3 - Create diagrams,...
OmniGraffle Pro helps you draw beautiful diagrams, family trees, flow charts, org charts, layouts, and (mathematically speaking) any other directed or non-directed graphs. We've had people use... Read more
OmniFocus 2.2 - GTD task manager with iO...
OmniFocus helps you manage your tasks the way that you want, freeing you to focus your attention on the things that matter to you most. Capturing tasks and ideas is always a keyboard shortcut away in... Read more
Cocktail 8.4 - General maintenance and o...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more
PDFKey Pro 4.3 - Edit and print password...
PDFKey Pro can unlock PDF documents protected for printing and copying when you've forgotten your password. It can now also protect your PDF files with a password to prevent unauthorized access and/... Read more
Kodi 15.0.beta1 - Powerful media center...
Kodi (was XBMC) is an award-winning free and open-source (GPL) software media player and entertainment hub that can be installed on Linux, OS X, Windows, iOS, and Android, featuring a 10-foot user... Read more
DiskCatalogMaker 6.4.12 - Catalog your d...
DiskCatalogMaker is a simple disk management tool which catalogs disks. Simple, light-weight, and fast. Finder-like intuitive look and feel. Super-fast search algorithm. Can compress catalog data... Read more
Macs Fan Control 1.3.0.0 - Monitor and c...
Macs Fan Control allows you to monitor and control almost any aspect of your computer's fans, with support for controlling fan speed, temperature sensors pane, menu-bar icon, and autostart with... Read more
Lyn 1.5.11 - Lightweight image browser a...
Lyn is a lightweight and fast image browser and viewer designed for photographers, graphic artists and Web designers. Featuring an extremely versatile and aesthetically pleasing interface, it... Read more

Battle of Gods: Ascension (Games)
Battle of Gods: Ascension 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: TURN-BASED TACTICAL COMBATFight tactical battles against the forces of Hades! In Battle of Gods: Ascension you play... | Read more »
Shadowmatic's Latest Update Adds a...
Shadowmatic's shadowy shadow-ness is getting a little shadowy-er thanks to a recent update that adds an Arcade Mode. [Read more] | Read more »
Sunrise Calendar and Slack Have Assimila...
Wunderlist is perhaps one of the most populat and beloved productivity apps on the App Store - and now it's gone and incorporated itself into other useful services like Sunrise Calendar and Slack. [Read more] | Read more »
Crossy Road Devs Hipster Whale are Bring...
Hipster Whale, the minds behind the rather popular (and rather great) Crossy Road, have teamed-up with Bandai Namco to create PAC-MAN 256: an absolutely bonkers looking maze runner chaser thing. | Read more »
Meet the New Spotify Music
Spotify Music  has a lot going on. They're introducing 3 new modes to serve all your musical needs, with the "Now" start page  gives you curated playlists based on your particular tastes. As you listen the app will learn more about your tastes and... | Read more »
What the Apple Watch Gets Right, and Wha...
| Read more »
Celebrate PAC-MAN's 35th Birthday W...
BANDAI NAMCO Entertainment America is celebrating PAC-MAN's 35th anniversary by releasing updates for PAC-MAN and PAC-MAN Lite for iOS. [Read more] | Read more »
Strike Wing Episode 2 has Landed on the...
Strike Wing: Raptor Rising is an exciting space combat simulator by Crescent Moon Games, which was recently updated to continue the story with Episode 2. [Read more] | Read more »
Kiqplan Expands its Interactive Coaching...
The makers of Fitbug have been hard at work on their Kiqplan lineup, and have added four new summer themed plans to help you get the most out of your workout. [Read more] | Read more »
Make a Photobook in Minutes with Pictyea...
What happens when you can't stop taking photos and have an urge to create a photobook? Pictyear saves the day. [Read more] | Read more »

Price Scanner via MacPrices.net

What Would the ideal Apple Productivity Platf...
For the past four years I’ve kept a foot in both the Mac and iPad camps respectively. my daily computing hours divided about 50/50 between the two devices with remarkable consistency. However, there’... Read more
PageMeUp 1.2.1 Ten Dollar Page Layout Applica...
Paris, France-based Softobe, an OS X software development company, has announced that their PageMeUp v. 1.2.1, is available on the Mac App Store for $9.99. The license can be installed on up to 5... Read more
Eight New Products For USB Type-C Application...
Fresco Logic, specialists in advanced connectivity technologies and ICs, has introduced two new product families targeting the Type-C connector recently introduced across a number of consumer... Read more
Scripps National Spelling Bee Launches Buzzwo...
Scripps National Spelling Bee fans can monitor the action at the 2015 Spelling Bee with the new Buzzworthy app for iOS, Android and Windows mobile devices. The free Buzzworthy app provides friendly... Read more
13-inch 2.5GHz MacBook Pro on sale for $120 o...
B&H Photo has the 13″ 2.5GHz MacBook Pro on sale for $979 including free shipping plus NY sales tax only. Their price is $120 off MSRP, and it’s the lowest price for this model (except for Apple’... Read more
27-inch 3.3GHz 5K iMac on sale for $1899, $10...
B&H Photo has the new 27″ 3.3GHz 5K iMac on sale for $1899.99 including free shipping plus NY tax only. Their price is $100 off MSRP. Read more
Save up to $50 on iPad Air 2, NY tax only, fr...
B&H Photo has iPad Air 2s on sale for up to $50 off MSRP including free shipping plus NY sales tax only: - 16GB iPad Air 2 WiFi: $469 $30 off - 64GB iPad Air 2 WiFi: $549.99 $50 off - 128GB iPad... Read more
Updated Mac Price Trackers
We’ve updated our Mac Price Trackers with the latest information on prices, bundles, and availability on systems from Apple’s authorized internet/catalog resellers: - 15″ MacBook Pros - 13″ MacBook... Read more
New 13-inch 2.9GHz Retina MacBook Pro on sale...
B&H Photo has the 13″ 2.9GHz/512GB Retina MacBook Pro on sale for $1699.99 including free shipping plus NY tax only. Their price is $100 off MSRP, and it’s the lowest price for this model from... Read more
Apple refurbished 2014 MacBook Airs available...
The Apple Store has Apple Certified Refurbished 2014 MacBook Airs available starting at $679. An Apple one-year warranty is included with each MacBook, and shipping is free: - 11″ 1.4GHz/128GB... Read more

Jobs Board

Senior Software Engineer - *Apple* SIM - Ap...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with Read more
Lead *Apple* Solutions Consultant - Retail...
**Job Summary** Job Summary The Lead ASC is an Apple employee who serves as the Apple business manager and influencer in a hyper-business critical Reseller's store Read more
Architect / Senior Software Engineer, *Apple...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with Read more
*Apple* Pay Support Readiness Project Manage...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with Read more
Hardware Design Validation Engineer - *Apple...
**Job Summary** The Apple Watch team is looking for a Hardware Design Validation Engineer. This person will be part of the Apple Watch hardware team with Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.