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
 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Dash 3.4.3 - Instant search and offline...
Dash is an API documentation browser and code snippet manager. Dash helps you store snippets of code, as well as instantly search and browse documentation for almost any API you might use (for a full... Read more
Civilization VI 1.0.2 - Next iteration o...
Sid Meier’s Civilization VI is the next entry in the popular Civilization franchise. Originally created by legendary game designer Sid Meier, Civilization is a strategy game in which you attempt to... Read more
TurboTax 2016 - Manage your 2016 U.S. ta...
TurboTax guides you through your tax return step by step, does all the calculations, and checks your return for errors and overlooked deductions. It lets you file your return electronically to get... Read more
Microsoft Office 2016 15.30 - Popular pr...
Microsoft Office 2016 - Unmistakably Office, designed for Mac. The new versions of Word, Excel, PowerPoint, Outlook and OneNote provide the best of both worlds for Mac users - the familiar Office... Read more
FotoMagico 5.3 - Powerful slideshow crea...
FotoMagico lets you create professional slideshows from your photos and music with just a few, simple mouse clicks. It sports a very clean and intuitive yet powerful user interface. High image... Read more
Acorn 5.6.1 - Bitmap image editor.
Acorn is a new image editor built with one goal in mind - simplicity. Fast, easy, and fluid, Acorn provides the options you'll need without any overhead. Acorn feels right, and won't drain your bank... Read more
iMazing 2.1.8 - Complete iOS device mana...
iMazing (was DiskAid) is the ultimate iOS device manager with capabilities far beyond what iTunes offers. With iMazing and your iOS device (iPhone, iPad, or iPod), you can: Copy music to and from... Read more
Logic Pro X 10.3 - Music creation and au...
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 creative... Read more
Microsoft Remote Desktop 8.0.37 - Connec...
With Microsoft Remote Desktop, you can connect to a remote PC and your work resources from almost anywhere. Experience the power of Windows with RemoteFX in a Remote Desktop client designed to help... Read more
Logic Pro X 10.3 - Music creation and au...
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 creative... Read more

Red's Kingdom (Games)
Red's Kingdom 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: Mad King Mac has kidnapped your father and stolen your golden nut! Solve puzzles and battle goons as you explore and battle your... | Read more »
Turbo League Guide: How to tame the cont...
| Read more »
Fire Emblem: Heroes coming to Google Pla...
Nintendo gave us our first look at Fire Emblem: Heroes, the upcoming mobile Fire Emblem game the company hinted at last year. Revealed at the Fire Emblem Direct event held today, the game will condense the series' tactical RPG combat into bite-... | Read more »
ReSlice (Music)
ReSlice 1.0 Device: iOS Universal Category: Music Price: $9.99, Version: 1.0 (iTunes) Description: Audio Slice Machine Slice your audio samples with ReSlice and create flexible musical atoms which can be triggered by MIDI notes or... | Read more »
Stickman Surfer rides in with the tide t...
Stickson is back and this time he's taken up yet another extreme sport - surfing. Stickman Surfer is out this Thursday on both iOS and Android, so if you've been following the other Stickman adventures, you might be interested in picking this one... | Read more »
Z-Exemplar (Games)
Z-Exemplar 1.4 Device: iOS Universal Category: Games Price: $3.99, Version: 1.4 (iTunes) Description: | Read more »
5 dastardly difficult roguelikes like th...
Edmund McMillen's popular roguelike creation The Binding of Isaac: Rebirth has finally crawled onto mobile devices. It's a grotesque dual-stick shooter that tosses you into an endless, procedurally generated basement as you, the pitiable Isaac,... | Read more »
Last week on PocketGamer
Welcome to a weekly feature looking back on the past seven days of coverage on our sister website, PocketGamer. It’s taken a while for 2017 to really get going, at least when it comes to the world of portable gaming. Thank goodness, then, for... | Read more »
ROME: Total War - Barbarian Invasion set...
To the delight of mobile strategy fans, Feral Interactive released ROME: Total War just a few months ago. Now the game's expansion, Barbarian Invasion is marching onto iPads as a standalone release. [Read more] | Read more »
Yuri (Games)
Yuri 1.0 Device: iOS iPhone Category: Games Price: $3.99, Version: 1.0 (iTunes) Description: It's night. Yuri opens his eyes. He wakes up in a strange forest.The small, courageous explorer rides on his bed on casters in this... | Read more »

Price Scanner via MacPrices.net

Laptop Market – Flight To Quality? – The ‘Boo...
Preliminary quarterly PC shipments data released by Gartner Inc. last week reveal an interesting disparity between sales performance of major name PC vendors as opposed to that of less well-known... Read more
IBM and Bell Transform Canadian Enterprise Mo...
IBM and Bell Canada have announced they are joining forces to offer IBM MobileFirst for iOS market-ready enterprise applications for iPad, iPhone or Apple Watch. Bell, Canada’s largest communications... Read more
Otter Products is Closing… For a Day of Givin...
On Thursday, Feb. 9, Otter Products is closing doors to open hearts. In partnership with the OtterCares Foundation, the company is pausing operations for a day so all employees can volunteer with... Read more
15-inch 2.2GHz Retina MacBook Pro on sale for...
Amazon has 2015 15″ 2.2GHz Retina MacBook Pros (MJLQ2LL/A) available for $1799.99 including free shipping. Apple charges $1999 for this model, so Amazon’s price is represents a $200 savings. Read more
Back in stock: Apple refurbished 13-inch Reti...
Apple has Certified Refurbished 2015 13″ Retina MacBook Pros available for up to $360 off original MSRP, starting at $1099. An Apple one-year warranty is included with each model, and shipping is... Read more
CalcTape for macOS 1.2 Adding Machine App for...
schoettler Software has announced CalcTape 1.2, an update to their desktop calculator for macOS. When it comes to adding long columns of numbers, doing complex calculations or playing around with... Read more
New MacBooks And MacBook Pros WIth Kaby Lake...
Digitimes’ Joseph Tsai cites a Chinese-language Economic Daily News (EDN) report that unnamed market watchers are predicting Apple MacBook shipments to grow 10 percent in 2017, and projecting 15... Read more
New 2016 13-inch MacBook Pros on sale for up...
B&H Photo has the new 2016 13″ MacBook Pros in stock today and on sale for up to $150 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 2.9GHz/512GB Touch Bar MacBook Pro... Read more
New 15-inch Touch Bar MacBook Pros in stock a...
B&H Photo has the new 2016 15″ Apple Touch Bar MacBook Pros in stock today and on sale for up to $150 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 15″ 2.7GHz Touch Bar... Read more
Opera Announces Neon Concept Browser For Mac
Opera is inviting users to get a glimpse of what Opera for computers could become with its Opera Neon browser concept. Each Opera Neon feature is described as “an alternate reality” for the Opera... Read more

Jobs Board

*Apple* Retail - Multiple Positions - Apple,...
SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (Multi-L...
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: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* & PC Desktop Support Technician...
Apple & PC Desktop Support Technician job in Stamford, CT We have immediate job openings for several Desktop Support Technicians with one of our most well-known Read more
*Apple* macOS Systems Integration Administra...
…most exceptional support available in the industry. SCI is seeking an Junior Apple macOS systems integration administrator that will be responsible for providing Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.