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

Logic Pro X 10.1.1 - Music creation and...
Apple Logic Pro X is the most advanced version of Logic ever. Sophisticated new tools for professional songwriting, editing, and mixing are built around a modern interface that's designed to get... Read more
VLC Media Player 2.2.0 - Popular multime...
VLC Media Player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, MP3, OGG, ...) as well as DVDs, VCDs, and various streaming protocols. It... Read more
Sound Studio 4.7.8 - Robust audio record...
Sound Studio lets you easily record and professionally edit audio on your Mac. Easily rip vinyls and digitize cassette tapes, or record lectures and voice memos. Prepare for live shows with live... Read more
LibreOffice 4.4.1.2 - Free, open-source...
LibreOffice is an office suite (word processor, spreadsheet, presentations, drawing tool) compatible with other major office suites. The Document Foundation is coordinating development and... Read more
Freeway Pro 7.0.3 - Drag-and-drop Web de...
Freeway Pro lets you build websites with speed and precision... without writing a line of code! With its user-oriented drag-and-drop interface, Freeway Pro helps you piece together the website of... Read more
Cloud 3.3.0 - File sharing from your men...
Cloud is simple file sharing for the Mac. Drag a file from your Mac to the CloudApp icon in the menubar and we take care of the rest. A link to the file will automatically be copied to your clipboard... Read more
Cyberduck 4.6.5 - FTP and SFTP browser....
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
Firefox 36.0 - Fast, safe Web browser. (...
Firefox for Mac offers a fast, safe Web browsing experience. Browse quickly, securely, and effortlessly. With its industry-leading features, Firefox is the choice of Web development professionals and... Read more
Thunderbird 31.5.0 - Email client from M...
As of July 2012, Thunderbird has transitioned to a new governance model, with new features being developed by the broader free software and open source community, and security fixes and improvements... Read more
VOX 2.4 - Music player that supports man...
VoxIt just sounds better! The beauty is in its simplicity, yet behind the minimal exterior lies a powerful music player with a ton of features & support for all audio formats you should ever need... Read more

Get The Whole Story – Lone Wolf Complete...
Get The Whole Story – Lone Wolf Complete is Now Available and On Sale Posted by Jessica Fisher on February 27th, 2015 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Who Wore it Best? The Counting Dead vs....
Like it or not, the “clicker” genre, popularized by cute distractions like Candy Box and Cookie Clicker, seems like it’s here to stay. So Who Wore it Best? takes a look at two recent examples: The Counting Dead and AdVenture Capitalist. | Read more »
Card Crawl, the Mini Deck Building Game,...
Card Crawl, the Mini Deck Building Game, is Coming Soon Posted by Jessica Fisher on February 27th, 2015 [ permalink ] Tinytouchtales and Mexer have announced their new game, | Read more »
Witness an all new puzzle mechanic in Bl...
Well, BlastBall MAX is not one of those games and is bucking trends such as timers, elements of randomness, and tacked-on mechanics in favor of pure puzzle gameplay. When you first boot up the game you’ll see a grid made up of squares that are each... | Read more »
This Princess Has a Dragon and She isn’t...
This Princess Has a Dragon and She isn’t Afraid to Useit. | Read more »
Mecha Showdown Review
Mecha Showdown Review By Lee Hamlet on February 27th, 2015 Our Rating: :: IN A SPINUniversal App - Designed for iPhone and iPad Mecha Showdown replaces traditional buttons with a slot machine mechanic in this robot fighting game,... | Read more »
Reliance Games and Dreamworks Unveil Rea...
Reliance Games and Dreamworks Unveil Real Steel Champions Posted by Ellis Spice on February 27th, 2015 [ permalink ] Reliance Games and Dreamworks have announced that a third game in | Read more »
Sum Idea Review
Sum Idea Review By Jennifer Allen on February 27th, 2015 Our Rating: :: TAXING NUMBERSUniversal App - Designed for iPhone and iPad Sum Idea is a fairly charming but taxing puzzle game.   | Read more »
A New Badland Update Brings Daydream Lev...
A New Badland Update Brings Daydream Levels to Co-Op Posted by Ellis Spice on February 27th, 2015 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Slashing Demons Review
Slashing Demons Review By Lee Hamlet on February 27th, 2015 Our Rating: :: IT'S A LONG WAY TO THE TOPUniversal App - Designed for iPhone and iPad Slashing Demons lacks the depth or scope to take it beyond the point of being just... | Read more »

Price Scanner via MacPrices.net

Apple CEO Tim Cook to Deliver 2015 George Was...
Apple CEO Tim Cook will deliver the George Washington University’s Commencement address to GWU grads on May 17, at which time he will also be awarded an honorary doctorate of public service from the... Read more
Apple restocks refurbished Mac minis for up t...
The Apple Store has restocked Apple Certified Refurbished 2014 Mac minis, with models available starting at $419. Apple’s one-year warranty is included with each mini, and shipping is free: - 1.4GHz... Read more
Save up to $50 on iPad Air 2s, NY tax only, f...
 B&H Photo has iPad Air 2s on sale for $50 off MSRP including free shipping plus NY sales tax only: - 16GB iPad Air 2 WiFi: $469.99 $30 off - 64GB iPad Air 2 WiFi: $549 $50 off - 128GB iPad Air 2... Read more
16GB iPad Air 2 on sale for $447, save $52
Walmart has the 16GB iPad Air 2 WiFi on sale for $446.99 on their online store for a limited time. Choose free shipping or free local store pickup (if available). Sale price for online orders only,... Read more
iMacs on sale for up to $205 off MSRP
B&H Photo has 21″ and 27″ iMacs on sale for up to $205 off MSRP including free shipping plus NY sales tax only: - 21″ 1.4GHz iMac: $1029 $70 off - 21″ 2.7GHz iMac: $1199 $100 off - 21″ 2.9GHz... Read more
Apple Takes 89 Percent Share of Global Smartp...
According to the latest research from Strategy Analytics, global smartphone operating profit reached US$21 billion in Q4 2014. The Android operating system captured a record-low 11 percent global... Read more
New Travel Health App “My Travel Health” iOS...
Rochester, Minnesota based Travel Health and Wellness LLC has announced that its new iOS app help safeguard the user’s health when traveling abroad — “My Travel Health” is now available on the Apple... Read more
Sale! MacBook Airs for up to $115 off MSRP
B&H Photo has MacBook Airs on sale for up to $100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 11″ 128GB MacBook Air: $799 100 off MSRP - 11″ 256GB MacBook Air: $999 $100... Read more
15-inch 2.0GHz Retina MacBook Pro (refurbishe...
The Apple Store has Apple Certified Refurbished previous-generation 15″ 2.0GHz Retina MacBook Pros available for $1489 including free shipping plus Apple’s standard one-year warranty. Their price is... Read more
Wither The iPad mini? End Of The Road Imminen...
AppleDailyReport’s Dennis Sellers predicts that the iPad mini is going to be left to wither on the vine, as it were, and then just allowed to fade away — a casualty of the IPhone 6 Plus and other... Read more

Jobs Board

Sr. Technical Services Consultant, *Apple*...
**Job Summary** Apple Professional Services (APS) has an opening for a senior technical position that contributes to Apple 's efforts for strategic and transactional 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
*Apple* Pay - Site Reliability Engineer - Ap...
**Job Summary** Imagine what you could do here. At Apple , great ideas have a way of becoming great products, services, and customer experiences very quickly. Bring Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple 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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.