TweetFollow Us on Twitter

Jun 96 Tips
Volume Number:12
Issue Number:6
Column Tag:Tips & Tidbits

Tips & Tidbits

By Steve Sisak

Note: Source code files accompanying article are located on MacTech CD-ROM or source code disks.

OpenDoc Frames and Facets

A major difficulty confronting every first time OpenDoc programmer is the difference between Frames and Facets. Both seem to refer to the “portion of a window” concept expressed in PowerPlant as a “pane” and in other frameworks as a “view”. In common frameworks, the pane hierarchy is both an embedding hierarchy and a visual hierarchy. In OpenDoc, the embedding hierarchy (frame) is separated from the visual hierarchy (facet) to allow for more flexibility in imaging.

In order to understand the separate roles for frame and facets, I have found it useful to create my own subtitles:

Frame - a contract for embedding

Facet - a region of a GrafPort

Think of ODFrame, first and foremost, as a relationship between two parts; a frame is a contract between a container and its embedded content. An embedded part is connected to its containing document only through its frames - if all the frames are closed, the part is no longer in the document. The embedding hierarchy alternates between parts and frames: parts have embedded frames, which have parts, which have embedded frames, and so on.

The ODFrame contract covers three primary areas: the shape of the embedded content, the view type (icon, thumbnail, or normal imaging), and the presentation format (particular to the kind of content, e.g. a chart, table, or graph). The container and embedded content mutually agree on these areas during a process called “frame negotiation”.

Either party can initiate frame negotiation. For example, a browser might want to show both an icon and a normal image for a particular embedded part. This container would create two embedding contracts, each with different shapes, view types, and presentations. On the other hand, a game controller might want to negotiate an irregular pod-shaped frame for its alien-like control panels. It would have to ask its containing part to approve this shape.

Frames, however, are an abstract contract. They are not portions of a window. In particular, frames have no GrafPort, no offset location, and no front-to-back ordering. To fulfill the abstraction, the container must make one or more facets for each frame that it wants to display. By making a facet, the container makes the frame visible and allows the user to interact with it.

Think of a facet as a region of a GrafPort. A facet has a coordinate transformation to locate itself in the GrafPort, and a clip region to make sure it does not exceed its bounds. A facet has a z-ordering, and can be highlighted or selected. Facets (and not frames) form the visual hierarchy. Importantly, facets cannot be negotiated. The container has sole control over assigning facets to its embedded frames, though it must respect the negotiated frame shape when it does so.

In most cases, the container creates only one facet per frame. Multiple facets occur in situations where a container has a split-screen view, and the same frame is imaged in multiple locations, with different clip regions. Another common use of facets is in page layout, where a frame might be split between the bottom of one page and the top of the succeeding page. To create the gap between pages, the container assigns upper and lower facets to the frame. But note that if a frame has multiple facets, they must all be in the same GrafPort. If you want to image the same content in two different windows, you must create a second frame (contract) for the second window.

If you think about it, the distinction between frames and facets makes logical sense. Consider a database container that stores thousands of embedded parts. After a search, the database displays 3 or 4 of those embedded parts. In this scenario, only the search results need facets (regions of a GrafPort) for display. But the database needs frames (the contract governing embedding) for all of the thousands of parts. It would likely want to remember the shape, view type, and presentation of each of these parts, so that when it needs to display them, it can show them just as they appeared the last time. Frames represent the persistent contract between the database and its embedded items. Facets represent the visual regions of the currently displayed parts.

For programmers with experience in other frameworks, the most important thing to remember is that a frame is not a portion of a window. It is simply a negotiated contract governing the shape, view, and presentation for an embedded content. This shape, view, and presentation becomes visible only when the container fulfills this contract by creating a facet for the part, thus specifying its GrafPort, origin, and clip shape.

Jeremy Roschelle

Yanking Ingenuity

These days, installing RAM in some of the new Power Macintosh computers is not as easy as it was with the Macintosh II series. So, here’s a tip for you Power Macintosh 8500 owners...

If you need to get access to your motherboard to install RAM, VRAM, or more Cache RAM, you’re going to have to first remove the deep-seated processor card before the motherboard can be removed from the chassis. This card is really difficult to remove because it is in there tight, and there just isn’t a lot of finger space to allow you to get a good grip on the card. After a couple roughed-up knuckles and sore finger tips, I found the following sane approach to solving this headache:

Take two small nylon cable ties (any color will do) and loosely loop them through the sturdy holes in the upper corners of the processor card. Then, you can easily insert your fingers through the two cable tie loops and apply enough equal pressure to carefully remove the processor card.

The good news is you can leave those cable ties in there in case you need future access to the motherboard (unless of course you have some other need for the holes).

Disclaimer: this tip has been thoroughly tested on several Power Macintosh 8500 computers and is bug-free. It is possible that some of the other models could also benefit from this tip.

Mark D. Gerl

[On a related note - the processor daughter card in PowerMac 9500 has a tendency to wander out of its socket if you move the machine around. This is fatal to the processor card. The repair person who fixed mine suggests opening the machine and re-seating the card if you move it to a different office, etc. - sgs ]

Immediate Drag Manager Feedback

The Drag Manager allows a feeback region to be dragged by the mouse. This region is created and passed into the TrackDrag trap:

 TrackDrag(
            DragReference         theDragRef,
            const EventRecord*    theEvent,
            RgnHandle             theRegion);

The Drag Manager doesn’t actually draw this region until the mouse has actually moved. Sometimes it is helpful if this region is drawn immediately. What to do?

Just futz with the where field of theEvent by a few pixels.

        theEvent->where.h += 3;   // the 3 comes from DnD HIG, p. 7
        theEvent->where.v += 3;
        err = TrackDrag(theDragRef, theEvent, theRegion);

...and a comment on the XOR Anti-Tip

One of the problems with the XOR swap (MacTech Magazine 11.10 [October 1995] 96) is that it doesn’t work if the source and destination are the same variables, as could happen with complicated, deeply nested macros.

Chris Sears

 
AAPL
$102.47
Apple Inc.
+2.71
MSFT
$44.88
Microsoft Corpora
+0.80
GOOG
$526.54
Google Inc.
+5.70

MacTech Search:
Community Search:

Software Updates via MacUpdate

EyeTV 3.6.6 - Watch and record TV on you...
EyeTV brings a rich TV experience to your Mac. Watch live TV on your Mac. Pause, rewind, and record whenever you want. EyeTV gives you powerful control over what you watch and how you watch it. Put... Read more
RapidWeaver 6.0 - Create template-based...
RapidWeaver is a next-generation Web design application to help you easily create professional-looking Web sites in minutes. No knowledge of complex code is required, RapidWeaver will take care of... Read more
NTFS 12.0.39 - Provides full read and wr...
Paragon NTFS breaks down the barriers between Windows and OS X. Paragon NTFS effectively solves the communication problems between the Mac system and NTFS, providing full read and write access to... Read more
RestoreMeNot 2.0.3 - Disable window rest...
RestoreMeNot provides a simple way to disable the window restoration for individual applications so that you can fine-tune this behavior to suit your needs. Please note that RestoreMeNot is designed... Read more
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

Latest Forum Discussions

See All

Swap Heroes (Games)
Swap Heroes 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: **Half price for a limited time only** Swap Heroes is a casual turn-based strategy adventure. Form a group of heroes and guide them... | Read more »
Ghost Blade (Games)
Ghost Blade 1.1 Device: iOS Universal Category: Games Price: $4.99, Version: 1.1 (iTunes) Description: Get the most outstanding 3D Action Game from App Store NOW! For those who dare pursue dreams. Masterpiece of Yu Shi Game ---China... | Read more »
Fiete – A Day on a Farm Review
Fiete – A Day on a Farm Review By Amy Solomon on October 21st, 2014 Our Rating: :: A MEMORABLE EXPERIENCEUniversal App - Designed for iPhone and iPad Fiete – A day on a farm in an interactive app for young children full of... | Read more »
Tilt to Live: Gauntlet’s Revenge is Almo...
Tilt to Live: Gauntlet’s Revenge is Almost Here Posted by Jessica Fisher on October 21st, 2014 [ permalink ] One Man Left has announced the official release date of Tilt to Live: Gauntlet’s Re | Read more »
Sago Mini Monsters Celebrates Halloween...
Sago Mini Monsters Celebrates Halloween with Fun Costumes and Special Treats. Posted by Jessica Fisher on October 21st, 2014 [ permal | Read more »
Inferno 2 Review
Inferno 2 Review By Andrew Fisher on October 21st, 2014 Our Rating: :: TWIN STICK GOODNESSUniversal App - Designed for iPhone and iPad With tight controls and awesome, stark visuals, Inferno 2 is loads of fun.   | Read more »
Clips Review
Clips Review By Jennifer Allen on October 21st, 2014 Our Rating: :: CONVENIENT PASTINGUniversal App - Designed for iPhone and iPad Making copying and pasting more powerful than usual, Clips is a great way to move stuff around.   | Read more »
MonSense Review
MonSense Review By Jennifer Allen on October 21st, 2014 Our Rating: :: ORGANIZED FINANCESiPhone App - Designed for the iPhone, compatible with the iPad Organize your finances with the quick and easy to use, MonSense.   | Read more »
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 »

Price Scanner via MacPrices.net

Select MacBook Airs $100 off MSRP, free shipp...
B&H Photo has 2014 a couple of MacBook Airs on sale for $100 off MSRP. Shipping is free, and B&H charges NY sales tax only. They also include free copies of Parallels Desktop and LoJack for... Read more
13-inch 2.5GHz MacBook Pro on sale for $100 o...
B&H Photo has the 13″ 2.5GHz MacBook Pro on sale for $999.99 including free shipping plus NY sales tax only. Their price is $100 off MSRP. Read more
Strong iPhone, Mac And App Store Sales Drive...
Apple on Monday announced financial results for its fiscal 2014 fourth quarter ended September 27, 2014. The Company posted quarterly revenue of $42.1 billion and quarterly net profit of $8.5 billion... Read more
Apple Posts How-To For OS X Recovery
OS X 10.7 Lion and later include OS X Recovery. This feature includes all of the tools you need to reinstall OS X, repair your disk, and even restore from a Time Machine backup. OS X Recovery... Read more
Mac OS X Versions (Builds) Supported By Vario...
Apple Support has posted a handy resource explaining which Mac OS X versions (builds) originally shipped with or are available for your computer via retail discs, downloads, or Software Update. Apple... Read more
Deals on 2011 13-inch MacBook Airs, from $649
Daily Steals has the Mid-2011 13″ 1.7GHz i5 MacBook Air (4GB/128GB) available for $699 with a 90 day warranty. The Mid-2011 13″ 1.7GHz i5 MacBook Air (4GB/128GB SSD) is available for $649 at Other... Read more
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

Jobs Board

Senior Event Manager, *Apple* Retail Market...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global event strategy. Delivering an overarching brand story; in-store, 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
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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.