TweetFollow Us on Twitter

Feb 89 Mousehole
Volume Number:5
Issue Number:2
Column Tag:Mousehole report

Mousehole Report

By Rusty Hodge & Larry Nedry, Mousehole BBS

From: thecloud (Ken Mcleod, La Habra, CA)

Subject: ScrollRect()

I’d like to be able to use ScrollRect to cause one bitmap to scroll down *into* a window, as the contents of that window are simultaneously scrolling down out of the visRgn. Trouble is, the update region gets filled with the port’s bkPat (white) by ScrollRect, and this results in a “flash of white” before I can get the area redrawn. Can anyone point out a strategy for accomplishing this “smoothly”? I’m currently doing something like this:

for (i=1; i <= appropriate_multiple_of_inc; i++) {
ScrollRect(&theRect, 0, inc, myRgnHandle);
ScrollRect(&anotherRect, 0, inc, myRgnHandle);   
Draw_Stuff_In_anotherRect()  }

but I’m sure I just need someone to kick me in the right direction!

From: rdclark (Richard Clark, Tustin, CA)

Subject: A kick in the right direction

Look at the articles by Scott Boyd (“The MacHax Group”) in the past 2 years of MacTutor -- they show how to do some pretty weird stuff with off-screen bitmaps and the like, including a trick to get rid of the “flash of white” when moving/updating a window.

From: lsr (Larry Rosenstein, Cupertino, CA)

Subject: Re: ScrollRect()

The best thing to do is to create an offscreen bitmap and use CopyBits to draw the bitmap on the screen in its proper position. If I understand your application correctly, you want to smoothly change from one image to the other. In that case, you would need to have the combined image offscreen, and use a series of CopyBits calls to draw the appropriate rectangle on the screen. (You would start out by copying the entire first image, then most of the first and part of the second, etc.)

CopyBits works the fastest when Quickdraw doesn’t have to shift every scan line. If you can control the position of the window on the screen, then you should make sure that its global screen position is a multiple of 16 (or 32 on a Mac II).

There probably is a way to prevent ScrollRect from erasing things, but the resulting effect wouldn’t be acceptable either. You would notice the delay between the ScrollRect and the redraw.

From: thecloud (Ken Mcleod, La Habra, CA)

Subject: Re: ScrollRect()

It always comes down to CopyBits in the end! Thanks...

From: robert (Rob Anthony, Chicago, IL)

Subject: MacIntalk

Check out APDA (Apple Programmers and Developers Assoc., in Renton, WA). They had -- in their ‘Curiosity Shoppe’ section -- the MacinTalk Development Package v. 1.31. It has docs and tools for using MacinTalk (they say). I don’t have it, so I can’t give any personal experience, but the APDA folks should be able to answer your questions. Need to be an APDA member to order; about $20 a year for that, but well worth it for the Mac programmer.

From: rhyman (Richard A. Hyman, Morrison, CO)

Subject: Desktop File

Prior to release 5 of the system software, the invisible Desktop file contained a resource called FOBJ that contained info on the open directories, view-by type information, and so on. The Finder used this info when starting up after quitting an application or during the boot-up. The FOBJ resource no longer exists with the newer system releases except for 400k MFS volumes. Does anyone know how this information is stored under system releases 5 & 6??

From: lsr (Larry Rosenstein, Cupertino, CA)

Subject: Re: Dialog Hook Procedure Problem

The problem is that you are using a local procedure, and the ROM is expecting a procedure at the top level. This is true of all the ROM routines that expect a pointer to a procedure. (In Pascal, nested procedures expect to find an extra parameter on the stack, which is a pointer to the enclosing stack frame.)

From: mwatts (Michael Watts, Santa Clara, CA)

Subject: limit on scroll bar value

Hi. I am new to the mousehole and have spent an informative session catching up. There is one question which I need help on if someone would be so kind.

In the app which I am writing, I have to deal with data which contains more than 32k points. I want to scroll through this data using a scroll bar, however the max value is an integer (opps). Even if I write my own control, in IM V I-333 the upper value for the CNTL resource is 2 bytes (not enough). I have kludged a fix by breaking the stream into 32k point sections, however this adds another control to my window and complexity to the program.

Does anyone know how to get around this problem, and if so how?

From: thotpolc (Bill Evans, Irvine, CA)

Subject: Re: limit on scroll bar value

“Doctor, it hurts when I do this.”

“Don’t do that....”

Your kludge to break the stream into 32k point sections is a good start. I don’t think the designers of the Mac interface and toolbox really anticipated someone scrolling more precisely than this. Notice, however, that the scroll bar is between two arrows, each of which points away from it. You could use these to scroll more precisely. To get the flavor of this, use any word processing program to create a document with more than 64k lines. (Probably short lines will make the whole thing a little easier.) Then scroll back and forth, using all parts of the scroll bar: the thumb (which is that funny white box you can slide back and forth with your... well, with your thumb), the gray parts of the bar itself, and the arrows at each end. In a well-tempered word processor, a single click in one of these arrows should move you up or down by one line; holding down the mouse in one of these arrows should, after a short while, start scanning through the document in small increments. Go thou and do likewise.-- the Thought Police

From: rdclark (Richard Clark, Tustin, CA)

Subject: Re: limit on scroll bar value

There are a couple of ways to take care of your problem:

1) Redesign the software so that a single click on the down arrow moves you down by n points instead of 1 point (where n could be 1/4 screen or something.) Some how, I don’t think that’ll be satisfactory for you. 2) Write a custom control definition that uses something larger than an integer (an unsigned integer, maybe?), then avoid using calls like “SetCtlValue” and “GetCtlValue”. Fortunately, there’s a set of options available to you in writing a custom control definition that allow you to get away without Set/GetCtlValue. The first problem involves dragging the “thumb” portion of the scroll bar. If you look at IM I-331 and I-332, you’ll see that you can write a “drag”, “position”, and “thumb” routine that override the control manager (I suspect that the control manager uses the get/set control value calls.) These could read your “extended” position information and adjust the control accordingly. That leaves a different problem -- what happens if the user clicks in one of the arrows?? You’ll need to pass a message to your control to adjust itself by 1. The only reasonable way I can think of doing this is to make one of your control messages do double duty (you don’t want to pick a new message number since Apple might decide to use that message someday, and that could hurt.) How about calling the control definition with a second (third, fourth...) “initCntl” message and a special value in the “param” parameter?? Your definition could recognize the special value (or the fact that you’re already initialized) and adjust itself accordingly.

On second thought, why not just live with a scroll bar position which is an approximation of the real position?? After all, we won’t be seeing 33K pixel by 33K pixel screens in the near future, so all your extra effort won’t mean much on the display.

From: mwatts (Michael Watts, Santa Clara, CA)

Subject: Re: limit on scroll bar value

That is a good suggestion. I was fixating on using the scroll bar value as my numerical indicator on where I was in the data set. Your suggestion implies I have a position variable which is incremented by the scroll step parameter and then position the thumb relative to the size of the data set.--a very “thoughtful” piece of advice.

ps- I still consider this a kludge solution. there should be a way to have the value of the scroll bar be a long integer.

From: rdclark (Richard Clark, Tustin, CA)

Subject: Re: limit on scroll bar value

Actually, I like the thought police’s answer MUCH better. (But I never could resist a good challenge!)

From: thotpolc (Bill Evans, Irvine, CA)

Subject: Re: limit on scroll bar value

rdclark (Richard Clark, Tustin, CA) writes:

On third thought, if you want exactly what you want without kludges, why not throw away the whole idea of part numbers and messages doing double duty and custom control definitions, and just do the whole durn thang using normal QuickDraw calls? I did this once with buttons which I wanted to have a special shape, and it was fun! If I ever use scroll bars, I’m going to want the thumb to be not square, but long enough to show what portion of the document is on the screen. That way, for example, if almost all of the document is on the screen and you’re at the beginning of the document, you’ll see a thumb which occupies almost all of the scroll bar, with a small gray area at the bottom. And if you click in that small area, you’ll see a large thumb move a small distance (while the data on the screen is doing exactly the same thing), not a small thumb jump grotesquely from the top to the bottom of the scroll bar.

And if I ever get around to having this fun, you can bet I’ll do it all without a formally defined control definition, thank you very much.

Does any of this give you the feeling that my favorite language is assembly? -- the Thought Police

From: rdclark (Richard Clark, Tustin, CA)

Subject: Re: limit on scroll bar value

Actually, it’s giving me a feeling that you’re a GEM fanatic! (duck incoming tomatos)

From: dhands (David Hands, Salem, OR)

Subject: MPW Print Interfaces

In the interface files of MPW Pascal there are two files, PrintTraps.p and MacPrint.p, that contain roughly the same calls. What’s the difference and when should one be used over the other?

From: think (Think Technologies, Bedford, MA)

Subject: Re: MPW Print Interfaces

PrintTraps.p is the trap-based interface to the Print Manager; the traps are implemented in the Mac SE and Mac II ROMs, and in System 4.1 or later on all machines.

MacPrint.p is the glue-based interface, and will work on all Macs, on all versions of the System software.

Rich Siegel Staff Software Engineer THINK Technologies Division Symantec Corp. Mousehole: think Usenet: singer@endor.uucp

Any opinions stated here do not necessarily represent the views or policies of the Symantec Corporation.

From: think (Think Technologies, Bedford, MA)

Subject: Lightspeed Pascal 2.0 Ships!

The following is excerpted from the press release announcing the shipment of THINK’s Lightspeed Pascal and Just Enough Pascal. the official announcement was made yesterday (Monday, November 14) at COMDEX, in Las Vegas.

“Symantec Corporation today announced THINK’s Lightspeed Pascal(tm) version 2.0 and Just Enough Pascal(tm) are shipping this week.

For a limited time, beginning this week, Symantec will bundle a copy of Just Enough Pascal in specially marked boxes of THINK’s Lightspeed Pascal. the suggested list price of the bundle is $149, and the promotion will continue until January 31, 1989.

Just Enough Pascal is the first tutorial of its kind, taking an inter- active approach to teaching the fundamentals of Pascal programming on the Macintosh. Users learn by building a real Macintosh game application in THINK’s Lightspeed Pascal, with all instructions and explanations provided on-line. As the user builds the program through various stages, he sees the results of each code change graphically illustrated on the screen.

New version 2.0 of THINK’s Lightspeed Pascal now generates the fastest, most compact code of any Pascal compiler available for the Macintosh. It provides options to generate code for the 68020 and for the 68881 math coprocessor, and features full access to all of the Macintosh ROM routines.

New and enhanced features of version 2.0 include: a fast, multipass optimizing compiler which produces compact, commercial-quality code; Object Pascal support; increased editor flexibility for virtually unlimited program size; and enhanced source-level debugger; and language extensions for improved compatibility with Apple’s Macintosh Programmer’s Workshop (MPW) Pascal.

Special introductory list pricing for THINK’s Lightspeed Pascal version 2.0 is $125. The price will increase to $149, effective February 1, 1989. Just Enough Pascal’s suggested list price is $75.

Registered owners may upgrade to THINK’s Lightspeed Pascal version 2.0 for $52.50 ($49 plus $3.50 shipping and handling; CA residents must add 7% sales tax, for a total of $55.93}. To upgrade, users must send a letter, including payment (US checks only) and registration number to:

Symantec Corporation Customer Service Department 10201 Torre Avenue Cupertino, CA 95014 ATTN: THINK’s Lightspeed Pascal 2.0 Upgrade

Purchasers of version 1.11 or earlier who bought the product after July 1, 1988 are entitled to a free upgrade. A dated proof of purchase must accompany the upgrade request. Further upgrade information is available from Symantec’s Customer Service Department at (408) 252-3570.

Symantec will also extend the special $175 introductory pricing of THINK’s Lightspeed C version 3.0 through January 31, 1989. Effective February 1, 1989 the price will increase to $249.” Rich Siegel Staff Software Engineer THINK Technologies Division Symantec Corp. Mousehole: think Usenet: singer@endor.uucp . [Any opinions stated here do not necessarily represent the views or policies of the Symantec Corporation. Pricing is still being determined by Symantec at Press time. -Ed]

 
AAPL
$99.02
Apple Inc.
+1.35
MSFT
$43.97
Microsoft Corpora
-0.53
GOOG
$590.60
Google Inc.
+1.58

MacTech Search:
Community Search:

Software Updates via MacUpdate

OS X Yosemite Wallpaper 1.0 - Desktop im...
OS X Yosemite Wallpaper is the gorgeous new background image for Apple's upcoming OS X 10.10 Yosemite. This wallpaper is available for all screen resolutions with a source file that measures 5,418... Read more
Acorn 4.4 - Bitmap image editor. (Demo)
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
Bartender 1.2.20 - Organize your menu ba...
Bartender lets you organize your menu bar apps. Features: Lets you tidy your menu bar apps how you want. See your menu bar apps when you want. Hide the apps you need to run, but do not need to... Read more
TotalFinder 1.6.2 - Adds tabs, hotkeys,...
TotalFinder is a universally acclaimed navigational companion for your Mac. Enhance your Mac's Finder with features so smart and convenient, you won't believe you ever lived without them. Tab-based... Read more
Vienna 3.0.0 RC 2 :be5265e: - RSS and At...
Vienna is a freeware and Open-Source RSS/Atom newsreader with article storage and management via a SQLite database, written in Objective-C and Cocoa, for the OS X operating system. It provides... Read more
VLC Media Player 2.1.5 - 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
Default Folder X 4.6.7 - Enhances Open a...
Default Folder X attaches a toolbar to the right side of the Open and Save dialogs in any OS X-native application. The toolbar gives you fast access to various folders and commands. You just click... Read more
TinkerTool 5.3 - Expanded preference set...
TinkerTool is an application that gives you access to additional preference settings Apple has built into Mac OS X. This allows to activate hidden features in the operating system and in some of the... Read more
Audio Hijack Pro 2.11.0 - Record and enh...
Audio Hijack Pro drastically changes the way you use audio on your computer, giving you the freedom to listen to audio when you want and how you want. Record and enhance any audio with Audio Hijack... Read more
Intermission 1.1.1 - Pause and rewind li...
Intermission allows you to pause and rewind live audio from any application on your Mac. Intermission will buffer up to 3 hours of audio, allowing users to skip through any assortment of audio... Read more

Latest Forum Discussions

See All

Traps n’ Gemstones Review
Traps n’ Gemstones Review By Campbell Bird on July 28th, 2014 Our Rating: :: CASTLEVANIA JONESUniversal App - Designed for iPhone and iPad Fight mummies, dig tunnels, and ride a runaway minecart to discover ancient secrets in this... | Read more »
The Phantom PI Mission Apparition Review
The Phantom PI Mission Apparition Review By Jordan Minor on July 28th, 2014 Our Rating: :: GHOSTS BUSTEDUniversal App - Designed for iPhone and iPad The Phantom PI is an exceedingly clever and well-crafted adventure game.   | Read more »
More Stubies Are Coming Your Way in a Ne...
More Stubies Are Coming Your Way in a New Update Posted by Jessica Fisher on July 28th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
The Great Prank War Review
The Great Prank War Review By Nadia Oxford on July 28th, 2014 Our Rating: :: PRANKING IS SERIOUS BUSINESSUniversal App - Designed for iPhone and iPad Though short, The Great Prank War offers an interesting and fun mix of action and... | Read more »
Marvel Contest of Champions Announced at...
Marvel Contest of Champions Announced at Comic-Con Posted by Jennifer Allen on July 28th, 2014 [ permalink ] Announced over the weekend at San Diego Comic-Con was the fairly exciting looking Marvel Contest of Champions. | Read more »
Teenage Mutant Ninja Turtles Review
Teenage Mutant Ninja Turtles Review By Jennifer Allen on July 28th, 2014 Our Rating: :: DULL SWIPINGUniversal App - Designed for iPhone and iPad The pizza power is weak when it comes to this Teenage Mutant Ninja Turtles game.   | Read more »
Exploration Focused Puzzle Game Beatbudd...
Exploration Focused Puzzle Game Beatbuddy Set to Make Transition from PC to iOS this September Posted by Jennifer Allen on July 28th, 2014 [ permalink ] | Read more »
PlanetHD
PlanetHD By Nadia Oxford on July 28th, 2014 Our Rating: :: SPACE MADNESSUniversal App - Designed for iPhone and iPad PlanetHD will keep players busy for a while, though its unpredictable physics are a handful to deal with.   | Read more »
This Week at 148Apps: July 21-25, 2014
Another Week of Expert App Reviews   At 148Apps, we help you sort through the great ocean of apps to find the ones we think you’ll like and the ones you’ll need. Our top picks become Editor’s Choice, our stamp of approval for apps with that little... | Read more »
Reddme for iPhone - The Reddit Client (...
Reddme for iPhone - The Reddit Client 1.0 Device: iOS iPhone Category: News Price: $.99, Version: 1.0 (iTunes) Description: Reddme for iPhone is an iOS 7-optimized Reddit client that offers a refreshing new way to experience Reddit... | Read more »

Price Scanner via MacPrices.net

Apple updates MacBook Pros with slightly fast...
Apple updated 13″ and 15″ Retina MacBook Pros today with slightly faster Haswell processors. 13″ models now ship with 8GB of RAM standard, while 15″ MacBook Pros ship with 16GB across the board. Most... Read more
iOS 8 and OS X 10.10 To Support DuckDuckGo As...
Writing for Quartz, Dan Frommer reports that Apple’s forthcoming iOS 8 and OS X 10.10 operating systems version updates will allow users to select DuckDuckGo as their default search engine. He notes... Read more
U.K. Hospital Using iPods and iPads To Record...
British news journal GazetteLive’s. Ian McNeal notes that the old “an apple a day keeps the doctor away” proverb is being turned on its head at http://southtees.nhs.uk/hospitals/james-cook/ James... Read more
13-inch 2.5GHz MacBook Pro on sale for $1099,...
Best Buy has the 13″ 2.5GHz MacBook Pro available for $1099.99 on their online store. Choose free shipping or free instant local store pickup (if available). Their price is $100 off MSRP. Price is... Read more
Roundup of Apple refurbished MacBook Pros, th...
The Apple Store has Apple Certified Refurbished 13″ and 15″ MacBook Pros available for up to $400 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free. Their prices... Read more
Record Mac Shipments In Q2/14 Confound Analys...
A Seeking Alpha Trefis commentary notes that Apple’s fiscal Q3 2014 results released July 22, beat market predictions on earnings, although revenues were slightly lower than anticipated. Apple’s Mac’... Read more
Intel To Launch Core M Silicon For Use In Not...
Digitimes’ Monica Chen and Joseph Tsai, report that Intel will launch 14nm-based Core M series processors specifically for use in fanless notebook/tablet 2-in-1 models in Q4 2014, with many models to... Read more
Apple’s 2014 Back to School promotion: $100 g...
 Apple’s 2014 Back to School promotion includes a free $100 App Store Gift Card with the purchase of any new Mac (Mac mini excluded), or a $50 Gift Card with the purchase of an iPad or iPhone,... Read more
iMacs on sale for $150 off MSRP, $250 off for...
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
Mac minis on sale for $100 off MSRP, starting...
Best Buy has Mac minis on sale for $100 off MSRP. Choose free shipping or free instant local store pickup. Prices are for online orders only, in-store prices may vary: 2.5GHz Mac mini: $499.99 2.3GHz... Read more

Jobs Board

Sr Software Lead Engineer, *Apple* Online S...
Sr Software Lead Engineer, Apple Online Store Publishing Systems Keywords: Company: Apple Job Code: E3PCAK8MgYYkw Location (City or ZIP): Santa Clara Status: Full 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
Sr. Product Leader, *Apple* Store Apps - 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 (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* 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.