TweetFollow Us on Twitter

Dialog Events
Volume Number:3
Issue Number:1
Column Tag:Basic School

Dialog Events in ZBasic

By Dave Kelly

DIALOG MANIA

The word 'mania' as used in the title of this month's Basic column has a kind of dual meaning. My dictionary says that 'mania' means: 1. wild or violent mental disorder 2. an excessive enthusiasm; obsession. I find both definitions express what it is like to program with ZBasic. Many of you have been following the 'Basic Wars' as they have been progressing. MS Basic 3.0 has been announced as of the writing of this column, although I have not seen it yet. This is supposed to be a $25 upgrade. The MS Basic compiler is also supposed to be out, at least Microsoft is marketing it by direct mail. (Note: The MS Basic compiler and version 3.0 of the MS Basic interpreter are two different products, both of which you need to compile programs!) Pterodactyl Software's PCMacBasic has not come back off the drawing board and True Basic is no better off than when I reviewed it back in August. But there has still been some hope. Zedcor has been scrambling to fix bugs in ZBasic and release version 3.02. They are to be commended for their dedication to making their product a success.

Why do I say that both definitions of 'mania' describe programming with ZBasic? The second definition comes to mind first. I'm excited to see the big improvements that have been incorporated into ZBasic. In fact, the BOMB is a much less frequent sight. In fact, the BOMBs that appear from time to time now are more obscure. In fact, some of the BOMBs are 'self inflicted'. In other words, sometimes things that I am not doing correctly turn out to be the problem. But there have been a few problems that demonstrate that not all the problems have been removed from the compiler.

One such example of what I am talking about was brought to my attention by one of our subscribers from Switzerland. He summed up ZBasic nicely when he said "...ZBasic is really a great Basic if only it worked!" He described to me a problem he was having when working with DIALOGs and ZBasic. He stated that he could not "flush the value of the DIALOG(1) function". The answer to his problem turns out to not be too hard, however, it reveals to us some other difficulties that ZBasic has 'built in' to it.

First, the solution to the DIALOG(1) problem is that it is not a problem. It will be helpful to understand how the DIALOG functions operate. The DIALOG function originates with MS Basic. The excitement comes when I see all the enhancements that have been added to the ZBasic implementation of DIALOGs. The purpose of the DIALOG function is to inform us when events (such as BUTTON, EDIT FIELD and WINDOWs) that occur between the DIALOG ON and DIALOG OFF statements.

It is important, when using DIALOG functions, to know when the function data is valid. The DIALOG(0) function is the key to it all. When an event occurs, the DIALOG functions are stored up in a 64 event queue. The ON DIALOG GOSUB statement is supposed to cause an interrupt to occur when some kind of event has happened. I say it is 'supposed to' because when writing the sample program included here I found that some of the items in the queue were not automatically read until another event occurred. Of course the new event was then pushed onto the queue and would not automatically interrupt via ON DIALOG. My solution was to poll the event queue continuously unless it was empty by accessing the DIALOG(0) function. Anyway, ideally the ON DIALOG should notify the program whenever any DIALOG events occur. The are seven events that are common to ZBasic and MS Basic. ZBasic now has 16 DIALOG functions including functions which support the Zoom windows and keyboard events. The DIALOG(0) function will return a number 1-16 (1-7 in MS BASIC) which will indicate to you what kind of event occurred. At the same time, the function that coresponds to the DIALOG(0) result will be updated. The functions ( DIALOG (1-16) ) are ONLY valid just after the DIALOG(0) function returns an event of that type. Otherwise the last event of that type remains on, stored up in the DIALOG functions. The figure shows a flow chart of what happens when DIALOG(0) has an event to be processed. Just remember to poll DIALOG(0) first to find out which of the other functions you will need to poll next.

Figure 2.

Another phenomenon that was observed was that when events are active ( the lines between DIALOG ON, MENU ON, BREAK ON, MOUSE ON and DIALOG OFF, MENU OFF, BREAK OFF, MOUSE OFF) the program seems to run much slower than without events on. I tried to turn off events wherever possible with some increase in speed, but there seems to be some delay between polling the time an event occurs and when it is finally processed. Has anyone done any benchmarks to compare speed when events are turned on? It is a difficult thing to compare as the implementation varies so much from one language to another.

Look out here comes another bug... As it turns out, the DIALOG(8) and DIALOG(9) statements work great. The problem is that Zoom windows still don't work quite right. In ZBasic 3.02 the demo program below will BOMB if Zoom windows are made active. I have set it up to demonstrate how it should work. The PEEK (&28E) AND 128 statement towards the beginning of the program checks to see if the Mac has old 64K ROMS or the new 128K ROMS installed. If the new ROMS are available then the window type should be set to 9 when the windows are created.

The example program outlines the basic flow which you will want to use when you implement your own ZBasic event loops. Notice that Menu events and Dialog events are mixed in the same event loop. This same structure also applies for MS BASIC. Any questions?

REM ZBasic V3.02 Dialog Example
REM ©MacTutor 1987
REM By Dave Kelly

WINDOW OFF:REM Always use this as first line of program to prevent default 
window from being created
COORDINATE WINDOW:REM Set window to  Macintosh coordinate system
False=0:True=NOT False
IF PEEK(&28E) AND 128 THEN Wtype=1 ELSE Wtype=9
Wtype=1:REM  Due to Bugs in ZBasic 3.02 Zoom window will not be used.

MENU 1,0,1,"File"
MENU 1,1,1,"Quit"
DIALOG OFF
WINDOW 1,"Window 1",(10,50)-(250,200),Wtype
TEXT 4,9,0,0
BUTTON 1,1,"Button 1",(20,20)-(100,50)
BUTTON 2,1,"Button 2",(20,60)-(100,90)
WINDOW 2,"Window 2",(275,50)-(500,200),Wtype
TEXT 4,9,0,0
EDIT FIELD 1,"",(10,10)-(100,35),1,1
EDIT FIELD 2,"",(10,40)-(100,65),1,1
WINDOW 3,"Dialog Event (Window #3)", (10,250)-(500,340),28
TEXT 4,9,0,0
ON DIALOG   GOSUB "DialogEvent"
ON BREAK    GOSUB "BreakEvent"
ON MENU GOSUB "MenuEvent"
DIALOG ON:BREAK ON:MENU ON
"Mainloop":DO:D=DIALOG(0)
IF D>0 THEN GOSUB "DEvent"
UNTIL D=0
GOTO "Mainloop"

"MenuEvent"
DIALOG STOP:
Menunumber=MENU(0):Itemnumber=MENU(1)
IF Menunumber=1 AND Itemnumber=1 THEN END
DIALOG ON
RETURN
"BreakEvent"
STOP

"DialogEvent"
D = DIALOG(0):REM check to see what event occured
"DEvent"
DIALOG STOP
Currentwindow = WINDOW(0)
Windowselection = WINDOW(1)
WINDOW OUTPUT 3
IF D = 1 GOSUB "Buttonevent"
IF D = 2 GOSUB "EditEvent"
IF D = 3 GOSUB "InactiveWindow"
IF D = 4 GOSUB "Closebox"
IF D = 5 GOSUB "Refresh"
IF D = 6 GOSUB "Returnkey"
IF D = 7 GOSUB "Tabkey"
IF D = 8 GOSUB "Zoomin"
IF D = 9 GOSUB "Zoomout"
IF D =10 GOSUB "Shifttab"
IF D =11 GOSUB "Clearkey"
IF D =12 GOSUB "LeftArrow"
IF D =13 GOSUB "RightArrow"
IF D =14 GOSUB "UpArrow"
IF D =15 GOSUB "DownArrow"
IF D =16 GOSUB "Keypress"
PRINT @(50,3) "DIALOG(0) :        ";D
PRINT @(50,4) "Active Window #";Currentwindow
PRINT @(50,5) "Output Window #";Windowselection
WINDOW OUTPUT Outwindow:WINDOW Windowselection
DIALOG ON
RETURN

"Buttonevent"
Buttonclicked=DIALOG(1)
Bstatus=BUTTON(Buttonclicked):BUTTON Buttonclicked,3-Bstatus
PRINT@(1,1)   "Button clicked :   ";Buttonclicked
RETURN

"EditEvent":
EditField=DIALOG(2)
PRINT@(1,2)   "Edit Field :       ";EditField
RETURN
"InactiveWindow"
Windowselection=DIALOG(3)
PRINT@(1,3)   "Inactive Window :  ";Windowselection
RETURN
"Closebox":
ClosedWindow=DIALOG(4)
IF ClosedWindow=3 THEN END
PRINT@(1,4)   "Closed Window :    ";ClosedWindow
RETURN
"Refresh":
ErasedWindow=DIALOG(5)
PRINT @(1,5)  "Erased Window :    ";ErasedWindow
RETURN
"Returnkey":
Returnpress=DIALOG(6)
PRINT @(25,1) "Return press :     ";Returnpress
RETURN
"Tabkey":
Tabpress=DIALOG(7)
PRINT @(25,2) "Tab press :        ";Tabpress
RETURN

"Zoomin": REM NEW ROMS ONLY
Zin=DIALOG(8)
WINDOW Zin
PRINT@(1,1) "Thank you for zooming in window";Zin
PRINT @(25,3) "Zoom in window :   ";Zin
RETURN
"Zoomout":
Zout=DIALOG(9)
WINDOW Zout
PRINT@(1,1)"Thank you for zooming out window";Zout
PRINT @(25,4) "Zoom out window :  ";Zout
RETURN
"Shifttab":
CurrentEdit=DIALOG(10)
PRINT @(25,5) "Current Edit Field:";CurrentEdit
RETURN
"Clearkey":
CurrentEdit=DIALOG(11)
PRINT @(25,5) "Current Edit Field:";CurrentEdit
RETURN

"LeftArrow":
CurrentEdit=DIALOG(12)
PRINT @(25,5) "Current Edit Field:";CurrentEdit
RETURN
"RightArrow":
CurrentEdit=DIALOG(13)
PRINT @(25,5) "Current Edit Field:";CurrentEdit
RETURN
"UpArrow":
CurrentEdit=DIALOG(14)
PRINT @(25,5) "Current Edit Field:";CurrentEdit
RETURN
"DownArrow":
CurrentEdit=DIALOG(15)
PRINT @(25,5) "Current Edit Field:";CurrentEdit
RETURN

"Keypress":
ASCIIkey=DIALOG(16)
PRINT @(50,1) "ASCII key pressed :";ASCIIkey;"  "
PRINT @(75,1) " ":PRINT @(75,1) CHR$(ASCIIkey)
RETURN
END
 
AAPL
$99.76
Apple Inc.
+2.09
MSFT
$44.08
Microsoft Corpora
+0.45
GOOG
$520.84
Google Inc.
+9.67

MacTech Search:
Community Search:

Software Updates via MacUpdate

Macgo Blu-ray Player 2.10.9.1750 - Blu-r...
Macgo Mac Blu-ray Player can bring you the most unforgettable Blu-ray experience on your Mac. Overview Macgo Mac Blu-ray Player can satisfy just about every need you could possibly have in a Blu-ray... Read more
Apple iOS 8.1 - The latest version of Ap...
The latest version of iOS can be downloaded through iTunes. Apple iOS 8 comes with big updates to apps you use every day, like Messages and Photos. A whole new way to share content with your family.... Read more
TechTool Pro 7.0.5 - Hard drive and syst...
TechTool Pro is now 7, and this is the most advanced version of the acclaimed Macintosh troubleshooting utility created in its 20-year history. Micromat has redeveloped TechTool Pro 7 to be fully 64... Read more
PDFKey Pro 4.0.2 - Edit and print passwo...
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
Yasu 2.9.1 - System maintenance app; per...
Yasu was originally created with System Administrators who service large groups of workstations in mind, Yasu (Yet Another System Utility) was made to do a specific group of maintenance tasks... Read more
Hazel 3.3 - Create rules for organizing...
Hazel is your personal housekeeper, organizing and cleaning folders based on rules you define. Hazel can also manage your trash and uninstall your applications. Organize your files using a... Read more
Autopano Giga 3.7 - Stitch multiple imag...
Autopano Giga allows you to stitch 2, 20, or 2,000 images. Version 3.0 integrates impressive new features that will definitely make you adopt Autopano Pro or Autopano Giga: Choose between 9... Read more
MenuMeters 1.8 - CPU, memory, disk, and...
MenuMeters is a set of CPU, memory, disk, and network monitoring tools for Mac OS X. Although there are numerous other programs which do the same thing, none had quite the feature set I was looking... Read more
Coda 2.5 - One-window Web development su...
Coda is a powerful Web editor that puts everything in one place. An editor. Terminal. CSS. Files. With Coda 2, we went beyond expectations. With loads of new, much-requested features, a few... Read more
Arq 4.6.1 - Online backup to Google Driv...
Arq is super-easy online backup for the Mac. Back up to your own Google Drive storage (15GB free storage), your own Amazon Glacier ($.01/GB per month storage) or S3, or any SFTP server. Arq backs up... Read more

Latest Forum Discussions

See All

This Week at 148Apps: October 13-17, 201...
Expert App Reviewers   So little time and so very many apps. What’s a poor iPhone/iPad lover to do? Fortunately, 148Apps is here to give you the rundown on the latest and greatest releases. And we even have a tremendous back catalog of reviews; just... | Read more »
Angry Birds Transformers Review
Angry Birds Transformers Review By Jennifer Allen on October 20th, 2014 Our Rating: :: TRANSFORMED BIRDSUniversal App - Designed for iPhone and iPad Transformed in a way you wouldn’t expect, Angry Birds Transformers is a quite... | Read more »
GAMEVIL Announces the Upcoming Launch of...
GAMEVIL Announces the Upcoming Launch of Mark of the Dragon Posted by Jessica Fisher on October 20th, 2014 [ permalink ] Mark of the Dragon, by GAMEVIL, put | Read more »
Interview With the Angry Birds Transform...
Angry Birds Transformers recently transformed and rolled out worldwide. This run-and-gun title is a hit with young Transformers fans, but the ample references to classic Transformers fandom has also earned it a place in the hearts of long-time... | Read more »
Find Free Food on Campus with Ypay
Find Free Food on Campus with Ypay Posted by Jessica Fisher on October 20th, 2014 [ permalink ] iPhone App - Designed for the iPhone, compatible with the iPad | Read more »
Strung Along Review
Strung Along Review By Jordan Minor on October 20th, 2014 Our Rating: :: GOT NO STRINGSUniversal App - Designed for iPhone and iPad A cool gimmick and a great art style keep Strung Along from completely falling apart.   | Read more »
P2P file transferring app Send Anywhere...
File sharing services like Dropbox have security issues. Email attachments can be problematic when it comes to sharing large files. USB dongles don’t fit into your phone. Send Anywhere, a peer-to-peer file transferring application, solves all of... | Read more »
Zero Age Review
Zero Age Review By Jordan Minor on October 20th, 2014 Our Rating: :: MORE THAN ZEROiPad Only App - Designed for the iPad With its mind-bending puzzles and spellbinding visuals, Zero Age has it all.   | Read more »
Hay Ewe Review
Hay Ewe Review By Campbell Bird on October 20th, 2014 Our Rating: :: SAVE YOUR SHEEPLEUniversal App - Designed for iPhone and iPad Pave the way for your flock in this line drawing puzzle game from the creators of Worms.   | Read more »
My Very Hungry Caterpillar (Education)
My Very Hungry Caterpillar 1.0.0 Device: iOS Universal Category: Education Price: $3.99, Version: 1.0.0 (iTunes) Description: Care for your very own Very Hungry Caterpillar! My Very Hungry Caterpillar will captivate you as he crawls... | Read more »

Price Scanner via MacPrices.net

2013 15-inch 2.0GHz Retina MacBook Pro availa...
B&H Photo has leftover previous-generation 15″ 2.0GHz Retina MacBook Pros now available for $1599 including free shipping plus NY sales tax only. Their price is $400 off original MSRP. B&H... Read more
Updated iPad Prices
We’ve updated our iPad Air Price Tracker and our iPad mini Price Tracker with the latest information on prices and availability from Apple and other resellers, including the new iPad Air 2 and the... Read more
Apple Pay Available to Millions of Visa Cardh...
Visa Inc. brings secure, convenient payments to iPad Air 2 and iPad mini 3as well as iPhone 6 and 6 Plus. Starting October 20th, eligible Visa cardholders in the U.S. will be able to use Apple Pay,... Read more
Textkraft Pocket – the missing TextEdit for i...
infovole GmbH has announced the release and immediate availability of Textkraft Pocket 1.0, a professional text editor and note taking app for Apple’s iPhone. In March 2014 rumors were all about... Read more
C Spire to offer iPad Air 2 and iPad mini 3,...
C Spire on Friday announced that it will offer iPad Air 2 and iPad mini 3, both with Wi-Fi + Cellular, on its 4G+ LTE network in the coming weeks. C Spire will offer the new iPads with a range of... Read more
Belkin Announces Full Line of Keyboards and C...
Belkin International has unveiled a new lineup of keyboard cases and accessories for Apple’s newest iPads, featuring three QODE keyboards and a collection of thin, lightweight folios for both the... Read more
Verizon offers new iPad Air 2 preorders for $...
Verizon Wireless is accepting preorders for the new iPad Air 2, cellular models, for $100 off MSRP with a 2-year service agreement: - 16GB iPad Air 2 WiFi + Cellular: $529.99 - 64GB iPad Air 2 WiFi... Read more
Price drops on refurbished Mac minis, now ava...
The Apple Store has dropped prices on Apple Certified Refurbished previous-generation Mac minis, with models now available starting at $419. Apple’s one-year warranty is included with each mini, and... Read more
Apple refurbished 2014 MacBook Airs available...
The Apple Store has Apple Certified Refurbished 2014 MacBook Airs available for up to $180 off the cost of new models. An Apple one-year warranty is included with each MacBook, and shipping is free.... Read more
Refurbished 2013 MacBook Pros available for u...
The Apple Store has Apple Certified Refurbished 13″ and 15″ MacBook Pros available starting at $929. Apple’s one-year warranty is standard, and shipping is free: - 13″ 2.5GHz MacBook Pros (4GB RAM/... Read more

Jobs Board

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* 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
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
Position Opening at *Apple* - Apple (United...
**Job Summary** At the Apple Store, you connect business professionals and entrepreneurs with the tools they need in order to put Apple solutions to work in their Read more
Position Opening at *Apple* - Apple (United...
**Job Summary** The Apple Store is a retail environment like no other - uniquely focused on delivering amazing customer experiences. As an Expert, you introduce people Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.