TweetFollow Us on Twitter

June 94 - Newton Q & A: Ask the Llama

Newton Q & A: Ask the Llama

Newton Developer Techical Support

Q Here's something that's been puzzling me a bit: I want to pop up something like a copyright message for ten seconds when my application starts up. So I drew up a layout called Presents with a protoFloater containing all the necessary text. In my main layout is a link to Presents called presentsLink. The following is the viewShowScript for the topmost view in my application:

func()
begin
	presentsLink:open();
	AddDelayedAction(presentsLink:close(), nil, 10000)
end

This says to me: open the linked view, wait ten seconds, and close it. And that's exactly what it does, except that after the view is closed, there's an exception. What am I doing wrong and how do I fix it? 

The short answer is that the second argument to the AddDelayedAction function is of the wrong type. This argument is supposed to be an array of parameters to be passed to the delayed function, and nil is not an array. The proper syntax for no arguments is [] instead of nil.

But there's more: Although the closure you supplied in the first argument works in this case, you should get out of the habit of using that type of function call for delayed or deferred actions. You're better off providing a full closure and sending in the view you want closed, as in this:

func()
begin
	// Define a closure to use in the delayed action.
	local myClose := func(whichView)
		whichView:Close();

	presentsLink:Open();
	AddDelayedAction(myClose, [presentsLink], 10000);
end

Unfortunately, things do not end there. You also need to make sure that the myClose function is in internal RAM. The best way to do this is to use DefConst to define the function:

// In your ProjectData file:
DefConst('kDelayedClose, func(whichView) whichView:Close());

// This changes the function above:
func()
begin
	presentsLink:Open();
	AddDelayedAction(EnsureInternal(kDelayedClose),
		[presentsLink], 10000);
end

However, there is an easier solution. Instead of doing a delayed action you can use the view idle mechanism to do what you want. All you need to do is add a viewIdleScript and viewIdleFrequency to the presentsLink top-level view. The viewIdleScript simply sends a Close message. The viewIdleFrequency is set to the desired delay (10000 in this case).

The really short answer is that you can just use protoGlance. This proto has the show-and- disappear behavior built in. You can set the viewIdleFrequency to 10000 to get the behavior you want.

Q I have an alphabetically sorted list of items in a protoTable and I want to use protoa2z to quickly move through the table (like the cardfile overview). How do I do it? 

The first thing you need to do is find the index in the protoTable of the correct item (that is, find the right item in the def.tabValues array of the protoTable). How you do this will depend on what type of data you're representing. Then you can figure out how high each item in the protoTable is, set the VOrg slot of the table to the correct line, and force the protoTable to redraw. You probably want to make sure that you don't scroll off the bottom of the table. Below is a method you can add to your protoTable that will do what you want. You can then send the message from your a2zChanged method (make sure you send the message to the protoTable).

func(index)
begin
	// Figure out the height of an item in the table.
	local childHeight := if def.tabProtos.viewFont exists then
		fontHeight(def.tabProtos.viewFont)
	else
		fontHeight(viewFont);
	
	// Make sure that the table will not scroll off the end
	// by calculating the index of the bottommost item that
	// will be displayed.
	local largestIndex := def.tabDown - ((:LocalBox().bottom -
		:LocalBox().top) DIV childHeight) - 1;
	
	// Use the bottommost item (largestIndex) to make sure
	// the table has no empty space on the bottom.
	vOrg := MIN(index, largestIndex);
	
	// Now force the table to redraw.
	:RedoChildren();
end

Q I would like to use the protoa2z sample code in my application, but I can't figure out how to set the highlighted letter when the user scrolls through my data. 

It's easy once you realize that protoa2z is based on a protoPictIndexer. All you have to do is a SetValue of the currIndex slot to the correct index. This will change the highlighting of the protoa2z.

Note that using SetValue will not call the IndexClickScript, but this is probably what you want. If you do want it to be called, you'll have to manually unhighlight the current selection, set the currIndex slot, and then highlight the new item. The appropriate code would be

a2z:Unhilite();
a2z.currIndex := newIndex;
a2z:Hiliter(newIndex);

Q What is your quest? 

To answer the questions of those who develop for Newton.

Q I tried to use a protoPictRadioButton in my application but the highlight rectangle isn't the right size. I know that I need to write some code to draw the correct-sized highlight, but where do I hook it in? 

Minimally you need to override the viewDrawScript of the protoPictRadioButton. You may also want to change the viewFormat since it defaults to a thick rounded-rectangle border. Assuming that you wanted some sort of rectangle highlight around the selected button, you could use the following viewDrawScript:

func()
begin
	// If the button is selected, highlight it.
	if viewValue then
	begin
	// Get the bounds of the protoPictRadioButton.
	local b := :LocalBox();
	
	// Inset the bounds.
	b.top := b.top + 2;
	b.left := b.left + 2;
	b.bottom := b.bottom - 2;
	b.right := b.right - 2;
	
	// Now draw a rectangle.
	:DrawShape(MakeRect(b.left, b.top, b.right, b.bottom), nil);
	end;
end

Q What is the AutoClose checkbox in the Newton Toolkit for? Why should I use it? 

The AutoClose flag causes all other AutoClose applications to be closed when your application is clicked. The effect is that only one "auto-close" application can be open at one time. You should always  make your application auto-close, to help conserve memory and other resources, unless it's providing special functionality to other applications (like the built-in Calculator or Styles application).

Q How do I create my own class of binary object? 

To get a binary object of your own class, you first need to create a binary object, then change its class to your own. The easiest way to do this is to create a string that's the same length as your intended binary object and then change (coerce) the class of this new object to your own class. You can use the string class as your basic binary object.

Suppose you wanted to have a binary class called CharID for an ID consisting of four ASCII characters. You could write a NewID function in your ProjectData file that would create the object and optionally initialize it, like this:

// Define a constant for a default CharID object. This constant
// can be cloned at run time. kDefaultCharIDObj will be a CharID
// object with 4 bytes that are set to 0x00.
DefConst('kDefaultCharIDOBj, SetClass(SetLength("", 4),
         'CharID));

// CharString is a string of 4 characters or nil.
NewCharID := func(CharString)
begin
	// Create a binary object of the correct length.
	local newObj := Clone(kDefaultCharIDObj);
	
	// Optionally initialize it.
	if CharString then
	for i := 0 to 3 do
		StuffChar(newObj, i, CharString[i]);
	
	// Return the new object.
	newObj;
end;

To see this code in action, you can type it into the Inspector window in the Newton Toolkit and evaluate it. Note that you cannot use DefConst in the Inspector since it's a compile-time function. Just substitute the second argument in the DefConst function for kDefaultCharIDObj in the function to evaluate it. Then you can try things like this:
x := :NewCharID(nil);
#440DD01 <CharID, length 4>
ExtractChar(x, 2);
#6 $\00
x := NewCharID("abcd");
#4410FC9 <CharID, length 4>
ExtractChar(x, 2);
#636 $c
ExtractByte(x, 2);
#18C 99

Q What is your favorite color? 

Llama fur beige.

Q In my application I have a clPictureView that can display a variable number of pictures. Right now I create a bunch of picture slots in my application and then make another slot at run time that is an array of those items. There must be an easier way. 

You're right; there is an easier way. You can use the GetPictAsBits function in your ProjectData file to read in the bitmaps. Note that you'll first have to open the resource file that contains the pictures.

// Open the resource file that contains the pictures.
// Assumes the file "Pictures" exists in the project folder.
r := OpenResFileX("Pictures");

// Get an array of pictures.
myPictures := [
	GetPictAsBits("TARDIS", nil),
	GetPictAsBits("Planet", nil)
];

// Now close the resource file.
CloseResFileX(r);

Once you have the myPictures array, you can create a slot of type Evaluate and just type "myPictures" in the editor for the slot. Then you can use SetValue to set the icon slot of the clPicture view to one of the elements of the array.

Q How do I put my own default person in the fax information slip? 

You can set up a default person in your SetupRoutingSlip method, which is called before the fax slip is shown. The argument to that method is used to set up the particular routing slip. In the case of a fax slip, there's a slot called "alternatives" which is an array of cardfile entries for the possible people to fax to. If there's just one entry, that's the person. The fax number will be set from the cardfile entry. So your SetupRoutingSlip method would look like this:

func(fields)
begin
	// Check for a fax.
	if fields.category = 'faxSlip then
	fields.alternatives := SmartCFQuery("Llama");
	// Do other stuff here, like put a title for the out box.
end

Note that the fields.category is set to the same value you set in the routeSlip slot of a frame in your application's entry in the global routing frame. The SmartCFQuery function returns an array of cardfile entries that have strings starting with the string passed in.

Q I noticed that every soup entry has a _uniqueID slot. Just how unique is it? 

The _uniqueID slot is only unique within that soup on that particular store. The ID will never be reused in that soup on that store. However, it's not necessarily unique across stores (say, RAM and a PCMCIA card).

Q What is the ground velocity of an unladen llama climbing a 5% grade? 

What do you mean -- Mexican or Venezuelan?


The llama is Thanks Have more questions?

 
AAPL
$116.47
Apple Inc.
+0.16
MSFT
$47.98
Microsoft Corpora
-0.72
GOOG
$537.50
Google Inc.
+2.67

MacTech Search:
Community Search:

Software Updates via MacUpdate

Cobook 3.0.7 - Intelligent address book....
Cobook Contacts is an intuitive, engaging address book. Solve the problem of contact management with Cobook Contacts and its simple interface and powerful syncing and integration possibilities.... Read more
StatsBar 1.9 - Monitor system processes...
StatsBar gives you a comprehensive and detailed analysis of the following areas of your Mac: CPU usage Memory usage Disk usage Network and bandwidth usage Battery power and health (MacBooks only)... Read more
Cyberduck 4.6 - FTP and SFTP browser. (F...
Cyberduck is a robust FTP/FTP-TLS/SFTP browser for the Mac whose lack of visual clutter and cleverly intuitive features make it easy to use. Support for external editors and system technologies such... Read more
Maya 2015 - Professional 3D modeling and...
Maya is an award-winning software and powerful, integrated 3D modeling, animation, visual effects, and rendering solution. Because Maya is based on an open architecture, all your work can be scripted... Read more
Evernote 6.0.1 - Create searchable notes...
Evernote allows you to easily capture information in any environment using whatever device or platform you find most convenient, and makes this information accessible and searchable at anytime, from... Read more
calibre 2.11 - Complete e-library manage...
Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital... Read more
Herald 5.0.1 - Notification plugin for M...
Note: Versions 2.1.3 (for OS X 10.7), 3.0.6 (for OS X 10.8), and 4.0.8 (for OS X 10.9) are no longer supported by the developer. Herald is a notification plugin for Mail.app, Apple's Mac OS X email... Read more
Firetask 3.7 - Innovative task managemen...
Firetask uniquely combines the advantages of classical priority-and-due-date-based task management with GTD. Stay focused and on top of your commitments - Firetask's "Today" view shows all relevant... Read more
TechTool Pro 7.0.6 - 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
PhotoDesk 3.0.1 - Instagram client for p...
PhotoDesk lets you view, like, comment, and download Instagram pictures/videos! (NO Uploads! / Image Posting! Instagram forbids that! AND you *need* an *existing* Instagram account). But you can do... Read more

Latest Forum Discussions

See All

Ubisoft Gives Everyone Two New Ways to E...
Ubisoft Gives Everyone Two New Ways to Earn In-Game Stuff for Far Cry 4 Posted by Jessica Fisher on November 21st, 2014 [ permalink ] | Read more »
Golfinity – Tips, Tricks, Strategies, an...
Dig this: Would you like to know what we thought of being an infinite golfer? Check out our Golfinity review! Golfinity offers unlimited ways to test your skills at golf. Here are a few ways to make sure your score doesn’t get too high and your... | Read more »
Dark Hearts, The Sequel to Haunting Meli...
Dark Hearts, The Sequel to Haunting Melissa, is Available Now Posted by Jessica Fisher on November 21st, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Meowza! Toyze Brings Talking Tom to Life...
Meowza! | Read more »
Square Enix Announces New Tactical RPG f...
Square Enix Announces New Tactical RPG for Mobile, Heavenstrike Rivals. Posted by Jessica Fisher on November 21st, 2014 [ permalink ] With their epic stories and gorgeous graphics, | Read more »
Quest for Revenge (Games)
Quest for Revenge 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: The great Kingdom of the west has fallen. The gods ignore the prayers of the desperate. A dark warlord has extinguished... | Read more »
Threadz is a New Writing Adventure for Y...
Threadz is a New Writing Adventure for You and Your Friends Posted by Jessica Fisher on November 21st, 2014 [ permalink ] In the tradition of round-robin storytelling, | Read more »
SteelSeries Stratus XL Hardware Review
Made by: SteelSeries Price: $59.99 Hardware/iOS Integration Rating: 4 out of 5 stars Usability Rating: 4.5 out of 5 stars Reuse Value Rating: 4.25 out of 5 stars Build Quality Rating: 4.5 out of 5 stars Overall Rating: 4.31 out of 5 stars | Read more »
ACDSee (Photography)
ACDSee 1.0.0 Device: iOS iPhone Category: Photography Price: $1.99, Version: 1.0.0 (iTunes) Description: Capture, perfect, and share your photos with ACDSee. The ACDSee iPhone app combines an innovative camera, a powerful photo... | Read more »
ProTube for YouTube (Entertainment)
ProTube for YouTube 2.0.2 Device: iOS Universal Category: Entertainment Price: $1.99, Version: 2.0.2 (iTunes) Description: ProTube is the ultimate, fully featured YouTube app. With it's highly polished design, ProTube offers ad-free... | Read more »

Price Scanner via MacPrices.net

Save up to $400 with Apple refurbished 2014 1...
The Apple Store has restocked Apple Certified Refurbished 2014 15″ Retina MacBook Pros for up to $400 off the cost of new models. An Apple one-year warranty is included with each model, and shipping... Read more
New 13-inch 1.4GHz MacBook Air on sale for $8...
 Adorama has the 2014 13″ 1.4GHz/128GB MacBook Air on sale for $899.99 including free shipping plus NY & NJ tax only. Their price is $100 off MSRP. B&H Photo has the 13″ 1.4GHz/128GB MacBook... Read more
Apple Expected to Reverse Nine-Month Tablet S...
Apple and Samsung combined accounted for 62 percent of the nearly 36 million branded tablets shipped in 3Q 2014, according to early vendor shipment share estimates from market intelligence firm ABI... Read more
Stratos: 30 Percent of US Smartphone Owners t...
Stratos, Inc., creator of the Bluetooth Connected Card Platform, has announced results from its 2014 Holiday Mobile Payments Survey. The consumer survey found that nearly one out of three (30 percent... Read more
2014 1.4GHz Mac mini on sale for $449, save $...
 B&H Photo has lowered their price on the new 1.4GHz Mac mini to $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... Read more
Check Apple prices on any device with the iTr...
MacPrices is proud to offer readers a free iOS app (iPhones, iPads, & iPod touch) and Android app (Google Play and Amazon App Store) called iTracx, which allows you to glance at today’s lowest... Read more
64GB iPod touch on sale for $249, save $50
Best Buy has the 64GB iPod touch on sale for $249 on their online store for a limited time. Their price is $50 off MSRP. Choose free shipping or free local store pickup (if available). Sale price for... Read more
15″ 2.2GHz Retina MacBook Pro on sale for $17...
 B&H Photo has the 2014 15″ 2.2GHz Retina MacBook Pro on sale for $1799.99 for a limited time. Shipping is free, and B&H charges NY sales tax only. B&H will also include free copies of... Read more
New Logitech AnyAngle Case/Stand Brings Flexi...
Logitec has announced the newest addition to its suite of tablet products — the Logitech AnyAngle. A protective case with an any-angle stand for iPad Air 2 and all iPad mini models, AnyAngle is the... Read more
Notebook PC Shipments Rise Year-Over-Year as...
According to preliminary results from the upcoming DisplaySearch Quarterly Mobile PC Shipment and Forecast Report, the global notebook PC market grew 10 percent year-over-year in Q3’14 to 49.4... Read more

Jobs Board

*Apple* Solutions Consultant (ASC)- Retail S...
**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, *Apple* Financial Services...
**Job Summary** Apple Financial Services (AFS) offers consumers, businesses and educational institutions ways to finance Apple purchases. We work with national and Read more
*Apple* Store Leader Program - College Gradu...
Job Description: Job Summary As an Apple Store Leader Program agent, you can continue your education as you major in the art of leadership at the Apple Store. You'll 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
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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.