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”;


 
AAPL
$524.94
Apple Inc.
+5.93
MSFT
$40.01
Microsoft Corpora
-0.39
GOOG
$536.10
Google Inc.
-20.44

MacTech Search:
Community Search:

Software Updates via MacUpdate

VMware Fusion 6.0.3 - Run Windows apps a...
VMware Fusion allows you to create a Virtual Machine on your Mac and run Windows (including Windows 8.1) and Windows software on your Mac. Run your favorite Windows applications alongside Mac... Read more
Tweetbot 1.5.1 - Popular iOS twitter cli...
Tweetbot is a full-featured OS X Twitter client with a lot of personality. Whether it's the meticulously-crafted interface, sounds and animation, or features like multiple timelines and column views... Read more
Mac DVDRipper Pro 4.1.7 - Copy, backup,...
Mac DVDRipper Pro is the DVD backup solution that lets you protect your DVDs from scratches, save your batteries by reading your movies from your hard disk, manage your collection with just a few... Read more
PDFpenPro 6.2 - Advanced PDF toolkit for...
PDFpenPro allows users to edit PDF's easily. Add text, images and signatures. Fill out PDF forms. Merge or split PDF documents. Reorder and delete pages. Even correct text and edit graphics! Create... Read more
PDFpen 6.2 - Edit and annotate PDFs with...
PDFpen allows users to easily edit PDF's. Add text, images and signatures. Fill out PDF forms. Merge or split PDF documents. Reorder and delete pages. Even correct text and edit graphics! Features... Read more
Monolingual 1.5.9 - Remove unwanted OS X...
Monolingual is a program for removing unnecesary language resources from OS X, in order to reclaim several hundred megabytes of disk space. It requires a 64-bit capable Intel-based Mac and at least... Read more
Maya 2015 - Professional 3D modeling and...
Maya is an award-winning software and powerful, integrated 3D modeling, animation, visual effects, and rendering solution. Because Maya is based on an open architecture, all your work can be scripted... Read more
Starcraft II: Wings of Liberty 1.1.1.180...
Download the patch by launching the Starcraft II game and downloading it through the Battle.net connection within the app. Starcraft II: Wings of Liberty is a strategy game played in real-time. You... Read more
Sibelius 7.5.0 - Music notation solution...
Sibelius is the world's best-selling music notation software for Mac. It is as intuitive to use as a pen, yet so powerful that it does most things in less than the blink of an eye. The demo includes... Read more
Typinator 5.9 - Speedy and reliable text...
Typinator turbo-charges your typing productivity. Type a little. Typinator does the rest. We've all faced projects that require repetitive typing tasks. With Typinator, you can store commonly used... Read more

Latest Forum Discussions

See All

This Week at 148Apps: April 14-18, 2014
Spring Into Our App Reviews   | Read more »
Have a Special Dead Trigger 2 Easter Bas...
Have a Special Dead Trigger 2 Easter Basket Full of Goodies, Courtesy of Madfinger Games Posted by Rob Rich on April 18th, 2014 [ permalink ] Dead Trigger 2 | Read more »
Almost All of Playdek’s Library is on Sa...
Almost All of Playdek’s Library is on Sale Right Now, and You Should Check it Out Posted by Rob Rich on April 18th, 2014 [ permalink ] Playdek has released quite a few great iOS ports of board and card games over the years, and now most of them... | Read more »
Zynga Launches Brand New Farmville Exper...
Zynga Launches Brand New Farmville Experience with Farmville 2: Country Escape Posted by Tre Lawrence on April 18th, 2014 [ permalink ] | Read more »
David. Review
David. Review By Cata Modorcea on April 18th, 2014 Our Rating: :: MINIMALISTIC IN A DIFFERENT WAYUniversal App - Designed for iPhone and iPad David is a minimalistic game wrapped inside of a soothing atmosphere in which the hero... | Read more »
Eyefi Unveils New Eyefi Cloud Service Th...
Eyefi Unveils New Eyefi Cloud Service That Allows Users to Share Media Across Personal Devices Posted by Tre Lawrence on April 18th, 2014 [ permalink ] | Read more »
Tales from the Dragon Mountain: The Lair...
Tales from the Dragon Mountain: The Lair Review By Jennifer Allen on April 18th, 2014 Our Rating: :: STEADY ADVENTURINGiPad Only App - Designed for the iPad Treading a safe path, Tales from the Dragon Mountain: The Lair is a... | Read more »
Yahoo Updates Flickr App with Advanced E...
Yahoo Updates Flickr App with Advanced Editing Features and More Posted by Tre Lawrence on April 18th, 2014 [ permalink ] | Read more »
My Incredible Body - A Kid's App to...
My Incredible Body - A Kid's App to Learn about the Human Body 1.1.00 Device: iOS Universal Category: Education Price: $2.99, Version: 1.1.00 (iTunes) Description: Wouldn’t it be cool to look inside yourself and see what was going on... | Read more »
Trials Frontier Review
Trials Frontier Review By Carter Dotson on April 18th, 2014 Our Rating: :: A ROUGH LANDINGUniversal App - Designed for iPhone and iPad Trials Frontier finally brings the famed stunt racing franchise to mobile, but how much does its... | Read more »

Price Scanner via MacPrices.net

Android Leads in Operating System Share Andro...
Consumer Intelligence Research Partners, LLC (CIRP) has released its latest results of its research on mobile phone operating systems for the calendar quarter that ended March 31, 2014. This analysis... Read more
Pelican Products, Inc. Introduces New Lineup...
Pelican Products, Inc., the global leader in the design and manufacture of high-performance protective cases, today announced the launch of a new line of rugged phone cases for both the Apple iPhone... Read more
SaveDrives – Car Dashboard Video Camera &...
Drivers who want to help reduce potential damage to their health and finances in the event of an accident can download the innovative new no-cost app SaveDrives – Car Dashboard Video Camera &... Read more
Deal Alert! 13-inch MacBook Pro on sale for $...
Best Buy has the 13″ 2.5GHz MacBook Pro on sale for $999.99 on their online store. Choose free shipping or free instant local store pickup (if available). Their price is $200 off MSRP. Price is valid... Read more
Free HopTo 2.2 Helps Enhance Your Productivit...
The HopTo app helps you do more on your iPad by providing more and easier adaccess to files and documents. Version 2.2 adds Egnyte and HopTo’s Mac OSX File Connector. If you already have the hopTo... Read more
National Distracted Driving Awareness Month:...
As the country recognizes National Distracted Driving Awareness Month, Sprint is reminding wireless consumers to focus on driving while behind the wheel, to not text or email while driving, and to... Read more
13-inch 2.4GHz Retina MacBook Pro available f...
Abt has the 13″ 2.4GHz 128GB Retina MacBook Pro available for $1229 including free shipping. Their price is $70 off MSRP. Read more
iMacs on sale for up to $160 off MSRP this we...
Best Buy has iMacs on sale for up to $160 off MSRP for a limited time. Choose free home shipping or free instant local store pickup (if available). Prices are valid for online orders only, in-store... Read more
iPad Airs on sale this weekend for up to $100...
Best Buy has WiFi iPad Airs on sale for $50 off MSRP and WiFi + Cellular iPad Airs on sale for $100 off MSRP on their online store for a limited time, with prices now starting at $449. Choose free... Read more
Apple restocks refurbished Mac minis starting...
The Apple Store has restocked Apple Certified Refurbished Mac minis for up to $150 off the cost of new models. Apple’s one-year warranty is included with each mini, and shipping is free: - 2.5GHz Mac... Read more

Jobs Board

Position Opening at *Apple* - Apple (United...
…customers purchase our products, you're the one who helps them get more out of their new Apple technology. Your day in the Apple Store is filled with a range of Read more
*Apple* Solutions Consultant (ASC) - Apple (...
**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* Inc. Research Data Specialist - Appl...
…of Worldwide Market Research & Intelligence. The team is responsible for conducting Apple branded consumer market research. It is also responsible for analyzing data Read more
*Apple* Automotive Parts Department position...
Apple Automotive is one of the fastest growing dealer…and it shows. Consider making the switch to the Apple Automotive Group today! At Apple Automotive, we Read more
*Apple* Solutions Consultant (ASC) - Apple (...
**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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.