TweetFollow Us on Twitter

Jul 97 - Newton Q and A

Volume Number: 13 (1997)
Issue Number: 7
Column Tag: develop

Jul 97 - Newton Q&A: Ask the Llama

by Apple Developer Technical Support Group

Q: I want to put my own custom icons in the picker that comes up when a user taps the action button. I have a slot in my base view called myTestIcon that contains the icon I want to use. But I can't figure out how to use that icon in the array of action frames in the routeScripts slot in my application. I started with the following routing item frame based on a simple "duplicate" action:

{title: "Test Action",
icon: ROM_routeDuplicateIcon,
routeScript: func(target, targetView)
begin
	// my function here
end,},

This worked fine. Then I replaced the icon specification with this code:

icon: GetRoot().(kAppSymbol).myTestIcon,

But this won't even compile. Any ideas?

A: The problem is that you're using the GetRoot function call in your array of routing action frames. Since the array of frames is in an evaluate slot (that is, the routeScripts slot), it will be evaluated at compile time in the Newton Toolkit environment. In other words, you're asking the Newton OS to look in the root view for your application's base view frame. This assumes that your application has been installed on a Newton device. But the code is executed at compile time, so there is no Newton device, no root view, and no base application frame.

The easiest way to solve your problem is to define a constant for the icon in a text file and then use that constant in the appropriate slot that defines the action.

Let's assume that you already have a resource file with the appropriate PICT resource, and that you have a text file as part of your project (if not, just create one from the NTK File menu and add it to your project). In the text file, add a line that looks something like this:

DefineGlobalConstant('kMyIcon, GetPictAsBits("MyIcon", nil));
// Note: Earlier versions of the platform file may use DefConst instead
// of DefineGlobalConstant.

This will give you a constant named kMyIcon. (Obviously you would replace kMyIcon with your own meaningful constant name and the string "MyIcon" with the name of the appropriate PICT resource.) Do this for each of the action menu icons that you want. Note that even though the action menu calls them "icons," you get the data by reading a Macintosh PICT resource, not a Macintosh ICON resource.

In your application's routeScripts slot where you create the array of extra action button actions, use the constant names you've created:

{title: "Test Action",
icon: kMyIcon,
routeScript: func(target, targetView)
begin
	// my function here
end,},

The other way you can solve your problem is by specifying the array of action frames at run time. Instead of specifying a routeScripts slot with your array of action frames, you can provide a GetRouteScripts method. Since this method lets you construct your array of action frames at run time in the Newton environment, the root view will exist and your application will be found.


Q: I'm using a protoLabelInputLine, which I've used many times before. In this case no user input happens in the input line. The entryFlags slot looks fine. It's set to vVisible, vClickable, vStrokesAllowed, vGesturesAllowed, and vAnythingAllowed. But strokes, gestures, and recognition do not occur. I tried adding a viewClickScript, viewStrokeScript, and viewGestureScript. The viewClickScript does get called, but none of the others do. When I remove the viewClickScript, there's still nothing. What's going on?

A: You've fallen prey to a rare gotcha that's hard to find unless you know what you're looking for. The clue is in the behavior with and without the viewClickScript. Without it, the line takes no input, so it appears as if the view is ignoring clicks. With it, you see something occurring. The key is that the viewClickScript of a clickable view will be searched for in both the proto and the parent chain. So you must have a viewClickScript defined in a parent of the protoLabelInputLine. When the user puts the pen down in the input line, the inherited script is found and executed in the context of the input line. This inherited script probably turns off the ink and then does some processing. You've seen the result.

The solution is to add a viewClickScript to your protoLabelInputLine that returns the value 'skip. This will let the protoLabelInputLine grab the stroke and allow recognition to happen. Note that simply returning true or nil would not solve the problem.


Q: The documentation for StuffLong says it "writes four bytes at the specified offset using the 30-bit signed value you pass it as a third parameter and sign-extends it to 32 bytes." Ignoring the obvious error ("32 bytes" should read "32 bits"), why does it take only 30 bits? I realize the language defines an integer as a 30-bit representation, plus a sign bit, but what's bit 31 for? More specifically, how can I use StuffLong to result in the value 0x20000000?

A: First off, the representation is not 30 bits plus a sign bit plus some other bit. NewtonScript uses a 30-bit two's complement signed representation. The other two bits are used by the OS for other purposes. So StuffLong takes integers as 30 bits because that's how NewtonScript represents integers. In the binary object, the other two bits will be the sign extension of the number you pass in. That is, they'll have the same value as the sign bit: 0 for positive, 1 for negative.

As you can probably see, it isn't possible to use StuffLong to put your long word into a binary object. The two high-order bits must be the same as the sign of the number. In your case, you have a 1 bit in the sign, but you want a 0 for both bits of the sign extension.

To stuff the data you want, you'll have to use some combination of StuffWord and/or StuffByte.


Q: I have some compile-time functions that generate frame data and some other functions that do sanity checking. Is it possible to abort the compile and give an error message once NTK has started compiling?

A: Yes. NTK implements a subset of the Newton environment. This includes the ability to throw exceptions. To abort a compile, throw an exception. If the exception is of the type '|evt.ex.msg|, any message you provide will be shown in a dialog by NTK. Here's a simple example:

throw('|evt.ex.msg|, "Invalid data at position " && theIndex);

Assuming that theIndex has the value 4, this statement will abort the current compile and display a dialog containing "Invalid data at position 4."

 
AAPL
$119.00
Apple Inc.
+1.40
MSFT
$47.75
Microsoft Corpora
+0.28
GOOG
$540.37
Google Inc.
-0.71

MacTech Search:
Community Search:

Software Updates via MacUpdate

HoudahSpot 3.9.6 - Advanced file search...
HoudahSpot is a powerful file search tool built upon MacOS X Spotlight. Spotlight unleashed Create detailed queries to locate the exact file you need Narrow down searches. Zero in on files Save... Read more
RapidWeaver 6.0.3 - Create template-base...
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
iPhoto Library Manager 4.1.10 - Manage m...
iPhoto Library Manager lets you organize your photos into multiple iPhoto libraries. Separate your high school and college photos from your latest summer vacation pictures. Or keep some photo... Read more
iExplorer 3.5.1.9 - View and transfer al...
iExplorer is an iPhone browser for Mac lets you view the files on your iOS device. By using a drag and drop interface, you can quickly copy files and folders between your Mac and your iPhone or... Read more
MacUpdate Desktop 6.0.3 - Discover and i...
MacUpdate Desktop 6 brings seamless 1-click installs and version updates to your Mac. With a free MacUpdate account and MacUpdate Desktop 6, Mac users can now install almost any Mac app on macupdate.... Read more
SteerMouse 4.2.2 - Powerful third-party...
SteerMouse is an advanced driver for USB and Bluetooth mice. It also supports Apple Mighty Mouse very well. SteerMouse can assign various functions to buttons that Apple's software does not allow,... Read more
iMazing 1.1 - Complete iOS device manage...
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
PopChar X 7.0 - Floating window shows av...
PopChar X helps you get the most out of your font collection. With its crystal-clear interface, PopChar X provides a frustration-free way to access any font's special characters. Expanded... Read more
Carbon Copy Cloner 4.0.3 - Easy-to-use b...
Carbon Copy Cloner backups are better than ordinary backups. Suppose the unthinkable happens while you're under deadline to finish a project: your Mac is unresponsive and all you hear is an ominous,... Read more
ForeverSave 2.1.3 - Universal auto-save...
ForeverSave auto-saves all documents you're working on while simultaneously doing backup versioning in the background. Lost data can be quickly restored at any time. Losing data, caused by... Read more

Latest Forum Discussions

See All

Make Way for Fat Chicken, from the Maker...
Make Way for Fat Chicken, from the Makers of Scrap Squad Posted by Jessica Fisher on November 26th, 2014 [ permalink ] Relevant Games has announced they will be releasing their reverse tower defense game, | Read more »
Tripnary Review
Tripnary Review By Jennifer Allen on November 26th, 2014 Our Rating: :: TRAVEL BUCKET LISTiPhone App - Designed for the iPhone, compatible with the iPad Want to create a travel bucket list? Tripnary is a fun way to do exactly that... | Read more »
Ossian Studios’ RPG, The Shadow Sun, is...
Ossian Studios’ RPG, The Shadow Sun, is Now Available for $4.99 Posted by Jessica Fisher on November 26th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Mmmm, Tasty – Having the Angry Birds for...
The very first Angry Birds debuted on iOS back in 2009. When you sit back and tally up the number of Angry Birds games out there and the impact they’ve had on pop culture as a whole, you just need to ask yourself: “How would the birds taste... | Read more »
Rescue Quest Review
Rescue Quest Review By Jennifer Allen on November 26th, 2014 Our Rating: :: PATH BASED MATCH-3Universal App - Designed for iPhone and iPad Guide a wizard to safety by matching gems. Rescue Quest might not be an entirely original... | Read more »
You Can Play the Final Chapter of Lone W...
You Can Play the Final Chapter of Lone Wolf: Dawn Over V’taag Right Now Posted by Jessica Fisher on November 26th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Swords of Anima (Games)
Swords of Anima 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: A new tactical turn-based RPG experience. Command the Savior Rex Squad in an epic journey of courage and deception. Can you... | Read more »
Audio Defence: Zombie Arena
Audio Defence: Zombie Arena By Lee Hamlet on November 26th, 2014 Our Rating: :: DRAGS ITS FEETUniversal App - Designed for iPhone and iPad From the makers of Papa Sangre comes a defense game that forces players to listen carefully... | Read more »
Tales from the Borderland​s Will be Comi...
Tales from the Borderland​s Will be Coming to iOS by the End of the Year Posted by Jessica Fisher on November 26th, 2014 [ permalink ] Telltale Games has announced | Read more »
Sunburn! Review
Sunburn! Review By Campbell Bird on November 26th, 2014 Our Rating: :: DON'T DIE ALONEUniversal App - Designed for iPhone and iPad Platform through the depths of space to make sure your entire crew dies together in this satisfying... | Read more »

Price Scanner via MacPrices.net

2014 1.4GHz Mac mini on sale for $449, save $...
 B&H Photo has the new 1.4GHz Mac mini on sale for $449.99 including free shipping plus NY tax only. Their price is $50 off MSRP, and it’s the lowest price available for this new model. Adorama... Read more
Early Black Friday pricing on 27-inch 5K iMac...
 B&H Photo continues to offer Black Friday sale prices on the 27″ 3.5GHz 5K iMac, in stock today and on sale for $2299 including free shipping plus NY sales tax only. Their price is $200 off MSRP... Read more
Early Black Friday sale prices on iPad Air 2,...
 MacMall is discounting iPad Air 2s by up to $75 off MSRP as part of their Black Friday sale. Shipping is free: - 16GB iPad Air WiFi: $459 $40 off - 64GB iPad Air WiFi: $559 $40 off - 128GB iPad Air... Read more
Early Black Friday MacBook Air sale prices, $...
 MacMall has posted early Black Friday MacBook Air sale prices. Save $101 on all models for a limited time: - 11″ 1.4GHz/128GB MacBook Air: $798 - 11″ 1.4GHz/256GB MacBook Air: $998 - 13″ 1.4GHz/... Read more
Why iPhone 6 Tablet/Laptop Cannibalization Is...
247wallst.com blogger Douglas A. McIntyre noted last week that according to research posted on the Applovin blog site the iPhone 6 is outselling the iPhone 6 Plus by a wide margin . Hardly a surprise... Read more
Worldwide Tablet Growth Expected to Slow to 7...
The global tablet market is expected to record massive deceleration in 2014 with year-over-year growth slowing to 7.2%, down from 52.5% in 2013, according to a new forecast from International Data... Read more
Touchscreen Glove Company Announces New Produ...
Surrey, United Kingdom based TouchAbility specializes in design and manufacture of a wide variety of products compatible with touchscreen devices including smartphones, tablets and computers. Their... Read more
OtterBox Alpha Glass Screen Protectors for iP...
To complement the bigger, sharper displays on the latest Apple devices, OtterBox has introduced Alpha Glass screen protectors to the iPhone 6 and iPhone 6 Plus. The fortified glass screen protectors... Read more
Early Black Friday Mac Pro sale, 6-Core 3.5GH...
 B&H Photo has the 6-Core 3.5GHz Mac Pro on sale today for $3499 including free shipping plus NY sales tax. Their price is $500 off MSRP, and it’s the lowest price available for this model from... Read more
Early Black Friday sale price: 15-inch 2.2GHz...
 B&H Photo has the 2014 15″ 2.2GHz Retina MacBook Pro on sale today for $1699.99. Shipping is free, and B&H charges NY sales tax only. Their price is $300 off MSRP, equalling Best Buy’s price... Read more

Jobs Board

*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
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* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the 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.