WWDC2003 Session 427

Transcript

Kind: captions Language: en you guys are hardcore excellent it's been a long long week but we got somebody here is going to make it all worthwhile Doug Davidson is going to talk to you about some of the really cool stuff in Cocoa tech so help me welcome to Sage Doug Davidson okay thanks Jason I'd like to thank you all for coming I like to think we've saved the best for the last as i said i'm doug davidson and i'm here to talk to you about the cocoa text system now anyone has worked with cocoa at all has seen the text system in action because in almost any case where cocoa application puts up text on the screen the text system is responsible for it in one way or another so the cocoa tech system is at the heart of a lot of the things we do in cocoa now what I'm going to do in this session is first of all I want to go briefly through some of the features of the cocoa tech system then we're going to dive in and explain how to start using them but the primary emphasis that I want to have is on what I think is the most interesting part of the tech system that is customizing it for your particular application because one of the principal design points the cocoa tech system is that it should be highly customizable throughout now as far as features go if you've used text edit you're probably familiar with a lot of the features of the cocoa tech system already because most of what you get with text edit are things that you will get for free whenever you use the tech system provided that you check the appropriate boxes and interface builder so showing this better than telling so let's move on over to the demo and let's take a look now what I have here is my version I just wrote of a very simple editor that you've probably seen demoed over and over very little code but it has all the features that you would expect features that we know and love but now this is running on Panther so we might expect something more for example fine panel and Panther the fine panel is now built into the text system it took me 0 lines of code to add this to my app and it's fully functional and actually quite cool features also for Panther we have completely redone the text ruler the old confusing line spacing controls that nobody can understand are gone by popular request in their place we have this neat little pop up here that by default allows you to pick single spacing or double spacing or in fact just about any kind of spacing you might like now we certainly didn't have user interface in Jaguar for most of these features and in fact some of them are completely new for Panther so for example the line hide multiple let's try picking one and a half line spacing and you'll notice that when we go back that's now showing up on the pop up so I can get to it easily again we also have this other little pop-up over on the other side this is the style pop up and what this allows you to do is to save any styles that you might like or use frequently so you can have them right at your fingertips whenever you want them now for demo purposes I've already pre-loaded this with a number of styles because I want to show off some of the new absolute features that we have in Panther for example underlined in jag where I think we had two different underline styles on Panther we have I think its authority for example you could get a double underline or a dotted underline or colored online it's basically just about anything you'd expect also we have taken the strike throughs and separated them from the underlines and given them the same sort of options so you can get double strike through cause strike through and so forth what else we now have outlined common request but we don't just have a single outline style we have a fully adjustable parameter so that you could get for example heavier outline if you like or a lighter outline but that's not all you also get to set independently the colors of the outline and the interior of the text so you can get some sexay like this now if you want to Coco update talk you've heard about a new class and a shadow that allows the setting of a drop shadow on drawing but it's also available as a text attribute so that you could have a figural shadow maybe a little tiny shadow I'm not sure if you can see it on this big monitor or perhaps a sum up large or somewhat slower shadow or essentially any shadow you want now what I'd really been intending to type here was something more spectacular but I forgot how to spell spectacular but that's okay in cancer because I just start typing and complete and then oh there it is now now this this text completion is fully customizable and i'll be showing a demo of that later on but for this particular application i decided i wanted to write zero lines of code for it and so all i got is the default built-in functionality which uses the system spelling dictionary plus anything i happen to have in my document already so let's put it all together I have a somewhat more complicated style here so a little something more spectacular for Panther oh yes there's one more thing when i go to save this document i can save it as rich text so or plain text just as you'd expect but there's one more option here i can also save this as a word document so this simple 51 application can read and write word document as a matter of fact in Panther any cocoa application can now read work documents without changes of code provided with using the standard in it with path or knit with URL ap is writing word documents is a little more difficult you need to have one line of code for that as far as reading word documents we go back as far as words six I think it is for writing muse the most recent format which is roughly word 97 and later you may have heard that word has a new xml file format called word ml and we need that too now I have to caution you of course there is going to be some loss of fidelity because the cocoa tech system does not support all the features that word does and vice versa well most notably for example the tech system doesn't have support for tables yeah but whereas before what you have to do is open up the document in word save it as RTF then open it in a cocoa application now we cut out that stuff entirely you can just open it directly in cocoa application and get the same effect okay so now let's go back to the slides and so what I want to do is review briefly there we go review briefly the new features that we've added to Panther so we have the new attributes and attribute features that I've showed you that outline shadows underline strikethrough and so forth we also have a couple of new attributes the tooltip and purser attributes that allow you to set a tool tip or a custom cursor associated with a particular region of text and we have a little something called a link attributes that i'll be showing you later on we have new paragraph style features such as the new line spacing options that I showed you and there are also some new tab stop features that I won't have time to go into right now we have some whole new API sets and it slipped generator and NSA TS types that are will be discussing more later on and then we have the most obvious invisible new features like the new font panel you've probably seen the new text ruler I showed you the fine panel completion reading and writing diplo word documents and there are quite a few other individual AP is that I may not be able to go into in detail here but I wrote a number of pages of release notes about them so i urge you to take a look the release notes take a look at the headers with all the new things for Panther are clearly marked in the headers and I think the release notes should go into quite a bit of detail describing what these things are what they do one other thing that's new for Panther is the WebKit and some of you may be wondering what's the relationship between Texas and text views and WebKit in the web views well the short answer is is they're different in much the same way that a web browser is different from word processor the fact that matter is that most web pages that they don't look very much like text pages and WebKit they know they're full of frames and plugins and JavaScript and so forth and WebKit is aimed squarely at the display the most complex HTML so if what you want is to display a chunk of HTML in your application probably what you want is a webview on the other hand if you want what you want to show is really text or in particular if you want edit ability then you want to text view and there's a sort of a bridge between them and that is that the cocoa tech system does have an HTML import feature which is necessarily lossy but it does at least allow you to get the text rich text content of HTML into the text system so now it's time to dive in and start showing you how to use all these features and new features and so forth but before I do that I want to put some structure and organization on my discussion of the text system and the paradigm I like to use is [Music] model-view-controller you we've heard it many times within the context of the text system the model is the text document the characters and their attributes the view is the text view seen that handles the user input and display and the controller classes handle everything in between you can do quite a lot in the text system just by dealing with in a text view as we'll see the text view is the visible face of the text system for most purposes and what a text view is is a representation of a single region within which texas laid out such as a page and it handles all of this display and all the user interaction for the text on that page if you have say multiple pages then you would have multiple text views and those sibling text views would know about each other and work together a nav a certain amount of shared state there are a few other tax classes that come in and work with the text system at the view level for example that its standard cocoa ruler classes are used and displaying the ruler for text and then there's a class called and a text attachment sell its especial kind of self that is used for displaying the icons or images corresponding to in line attached file and the most visible new features for Pantha come in at the view level the updated font towel I mentioned that new text rulers fine panel completion and the curses and tool tips that I talked about and in the context of the text system the model as i said the text document and the class is all serious and it's text storage now and it's text storage is a direct subclasses and it's mutable attributed string and that's how you should think of it as a mutable attributed string with a few extra features primarily being that the text storage notifies the rest of the text system whenever it changes so the technician can respond what is an attributed string an attributed string contains and in a string which is conceptually sequence of unicode characters but in addition it has attributes so conceptually to each character it applies a dictionary of attributes and this dictionary has keys that are in a strings and there are a bunch of standard values you can also use custom values of your own and the values in this dictionary well they depend on the key so for example the value for the font attribute is Anna spot value for various color attributes or ennis colors and so on so there are a number of different classes that come in to the model layer here as values of attributes and its font and its color and it's paragraph style that I'll be talking about and a shadow that you've heard about before in addition to the standard value classes like in this number there are a couple of other classes that are used to your shuffle special classes and if text attachment is a model for the contents of an inline attached file and I like to put in a text container as a model level because it's a purely geometric object at what Anna text container is is modeled the geometry of a page for example the shape and size and so there's one associated with each text view so what are these attributes the standard ones that are recognized and understood by the text system are listed in an appt get header called and it's attributed string dot H in the app kit and they include most of what you'd expect fonts colors underline strikethrough and so on and so forth there are a few things that don't appear as individual separate attributes for example bold and italic are not separate attributes they're treated as straight to the font and we use an ass Pont manager to add these trades or remove these trades from fonte also anything that is part of a paragraph style like margins tab stops line spacing and so forth it's not a separate attribute but instead it's a feature of and a paragraph style object that encapsulates all that information and then there are some special attributes that deal with view and display and interaction like the cursor and tooltip attributes as I mentioned before and then there's a link attribute that's used whenever Texas as a hyperlink associated to it and the attachment attribute that's used when there's an inline attached file and we have quite a lot of new features in Panther the absolute level we have the stroke width and stroke color that I demonstrated for reviews for outlines the new underline styles and colors rights yourselves divorce the shadows a couple i haven't mentioned those bleakness and expansion you can look at so they can look up those up and the cursor and tooltip attributes so now we have enough to talk about it was more or less the first level of customization of the text system where you deal with the view and the model layers only and you don't worry about what comes in between so the first thing you should think about when trying to customize this level is receiving notifications from the text view or acting as a text youth delegate now the text views delegate is actually very powerful for example the text youth delegate is notified whenever the user makes any change the text and the delegate has the opportunity at that point to accept or deny or modify that change so the text use delegate control whatever the user does text you the text to delegate is also notified if the user makes a change to the selection in the text view and again has the opportunity to accept or deny or modify that change and there are many other text view delegate methods to give the the delegate control over a lot of things that are going on with the text view and its user interaction but in some cases you'll find you want to do some kind of customization that you can't do as an excuse delegate at that point then it's time to start thinking of sub classing in a text view if you went to the tips and tricks session earlier today I gave an example of a custom subclass aventis text view that was intended to do some additional drawing it was drawing bubbles around the text so much the sword way that I chat does resemble and you can also a subclass for to customize the user interaction of the text view number by the way I'm going to give an example in a minute that will I think show clearly the distinction between delegation and sub classing and working within a text view now when you go to customize the Texas and it will often happen that you want to make modifications to the text that you're working on and the way this typically works in the tech system is that user initiated changes to the text go first the text view and then threw it to the text storage whereas programmatic changes will typically go directly to the text story but they all end up with the text storage in the end and the text storage as I said is a mutable attributed string when you want to change it you just use mutable attributed string methods to alter it but as I also said it has this additional feature that it notifies the rest of the Texas and whatever it changes so if you're going to be making multiple changes to the same text storage in a row what you want to do is wrap those in a call to begin editing and end editing and what that will do is cause those notifications be coalesce into a single one at the end for efficiency's sake you can also subclass in a sec stories but that's a little more difficult talking about that later on so let's go over to the demo again and i want to show an example of customizing text view both is delegate and subclass so we have here we're going back to text completion and you'll recall I told you that text completion was fully customizable so here's a custom completion that you might use if you are working and say financial reporting what this will do if you type in the name of a company until you complete it will complete the name of the company it will also add the stock ticker symbol and if there's more than one and you get a list and you get the pic right and you'll notice that these things are the stock tickers here are blue and underlined and it fax line mouse over then i get a pointing hand cursor which is a clue that these are actually linked and i chose to set them up this links to the stock price i see we're not doing so well so how do we do this let's see if we can take a look at the code there we go okay so I set this up as a text view that has both a delegate and it's also a custom subclass now that what the text views delegate can do in the context of completion the delegate is allowed to have complete control over the list of completions that's presented their order and which one is first selected so that's the first thing we're doing as a delegate we implement text view completions for partial word ranges and so forth and we have a dictionary hear that whose values are the company names and keys are the symbol ticker symbols and so the possible completions are just the whole list of company aims all the keys in the dictionary and all we do is go through and see if the partial word that we're completing has one is a prefix to one of those then we add a holistic completions and we're done so that's what you could do acting with completion acting with the text views delegate but we also did something more when the completion was actually accepted and confirmed we added in the stock ticker symbol and made it awake now there are a number of methods associated with completion that are designed to be over I double x sub classes and one of them is this method and search completion for partial word range that handles putting the completion back into the text now there's one thing I just skipped over that I probably should mention and that is this we made a call to set link text attributes now when you set link text attributes on a text view this is a special set of attributes that the text view will automatically apply to text that has a link on it so in this case we're making it blue and we're giving it underlined and we're adding pointing hand cursor to it so all text it has a link will automatically get those attributes applied to it so now our subclasses method for inserting completion what it's going to do is it gets told whether this is a tentative completion or final confirmed completion and if it's a final confirmed completion and we have the stock ticker symbol for it then what we're going to do is let it be inserted as usual we call super method and then we're going to create a proprietary ng to be inserted so we add the ticker symbol to it then we got a URL and you add this link attributes to the appropriate range corresponding to the ticker symbol and then the textview automatically does the rest applying the blue color of the line and cursor to it because he said the link text attributes you could also have complete control over the list of completions presented as a textview subclass but I chose extended in a delegate in this case just to make the distinction clear okay so let's go back to the slides okay now you could do quite a bit with the cocoa text system by dealing only with the view and the model layers and never worrying about what happens in between but at some point you're probably going to get curious and wonder how it is the Dakota Texas and actually goes from the characters and their attributes in the text storage to the pixels you see on the screen but before I discuss that I'm going to need to introduce another concept and not as a cliff now characters in the text storage are unicode characters but a glyph is something different a glyph is a single displayable element of a particular font it has no meaning outside of the particular font that is in so in some sense the job of the text system at least at the controller level is to take the characters and attributes in the text storage and to convert them to a sequence of glyphs and their positions that can be displayed that's not quite as simple to might sound for example the relationship between characters and glyphs is not one to one it's potentially many dimension so for example if we look at the character we recognized as an accented a cute accent at a in Unicode this can be represented either as a single axon to a character or as two characters in a and accent likewise depending on the thought it might potentially be represented by one acted at a cliff or might be represented by two glyphs and a accent and the tech system has to keep track of all that in the relationship between the two and then it has to calculate the appropriate position for the glyphs so that we end up with a final displayed result that is appropriate glyphs in the appropriate places of the appropriate attributes so one of the classes that are actually involved in doing this the principal class that ball cheers and it's layout manager and a flap manager is the heart of the text system it is the controller class in the cocoa text system I said that the text storage notifies the rest of the text system when a chain well it's the layout manager that gets notified by the tech storage and when that happens the layout manager keeps track and it ranges for all the necessary work to be performed so that the glyph and their positions are available when needed for displaying the text there are a couple of subsidiary classes that it calls upon to do this and it's glyph generator and NS typesetter and these are new for Panther and it slipped generator is new on and it's typesetter itself is not new but the main concrete subclass and it's 80s types that are is new for panther and i'll be discussing these in more detail later on and then the layout manager stores all the information about the sequence of glyphs and where their position and it's actually a layout manager that does the display ranges for them to be displayed as necessary when requested to do so by the view so how is it the text gets from the characters and attributes in the text storage to the pixels you see on the screen there are four separate steps I want to go through them in order first attribute fixing we make sure the attributes are consistent second glyphs jason where we convert the characters and their fonts into glyphs third layout where these glyphs are broken up into lines the glyphs the position in the line lines a position on the page and finally display where the glyphs are marshaled up and sent down to ports to actually be rasterized and it fits on the screen or displayed on the printer or PDF or what have you and in the Coco tech system all these processes are usually done lazily and on-demand so what typically happens is that although these occur in this order they get pulled through from the end so what will happen is that the text view will be required to redisplay a certain region so it will call on the layout manager do that and the layout manager in order to do that needs the layout information so the layout information have to be calculated but to do the layout you need to have generated the cliff so it causes that to be done but in order before you generate the cliff you need to fix the attributes so it causes all that to occur in order pull through from the end attribute fixing now attributed fixing is actually performed by the text storage there are several different kinds first of all there's font fixing where we make sure that the thought that's applied to a particular character is actually font that can render that character and we will the Coco tech system will substitute fonts as necessary in order to get one that can render the specified character and there's paragraph fixing you remember I talked about the end of paragraph style attribute that encapsulates all the paragraph style level features well what we need to do is make sure that that attribute is actually constant over the length of an entire paragraph of text we can't have more than one for a given paragraph and then there's attachment fixing which makes sure that the attachment attributes applies only to the attachment character what it's supposed to and can all these be customized yes they can be customized by subclassing and a text storage and overriding the appropriate methods next glyph generation now when the layout manager is informed by the text stories that things have changed it will have to invalidate a certain portion of any information that already has due to that change you can also manually cause the layout manager to do this invalidation if you want to force them recalculation and so then when that information is needed again the layout manager will call on the glyph generator typesetter to recalculate the information about what the glyphs are and where they were positioned and it is and it's glyph generator that actually does a conversion from characters and fonts to the glyphs and the layout manager stores the sequence of glyphs that it has produced and the lamp because the relationship between characters and glyphs not one to one the layout manager also has to keep track of the relationship between character indexes and glyph indexes and if you ever need that information you go back to the lab measure and ask it then comes layout and the layout manager calls on the typesetter to perform the layout the types that are goes back to the layout manager to find out what the glyphs are but they're already been generated and it goes to the text container to determine the geometry of the page to figure out where it can put lines on the page and then the typesetter is the class that actually calculates the layout it breaks the text up in two lines positions eclipse in the lines and it is also allowed at this point to insert or change glyphs and the glyph stream for example if it's doing hyphenation it may need to insert a hyphen cliff and then the types that are called back to the layout manager and tells it what it did that it tells it where each line ended up and which lifts ended up in the line and where it goes through positioned in the line and the layout manager stores that information then display when the textview needs to redisplay a certain region first thing it does is go to the layup measure and ask it what glyphs are involved what glisten needed to display that particular region of text and then it calls back on the layout manager again first to cause the layout manager to display the background appropriate to those glyphs that's typically things like the selection rectangles and finally to ask the layout manager to display the glyph and along with any other additional drawing that's needed like underline strikethrough attachments and so forth now it's not just in a text view that can do this your custom view can do it too in fact there's an example developer examples app kids circle view that does this there are a couple things you have to remember if you're going to do this when you call on the layout manager to do this sort of drawing you must already have focus locked on a flip view if you view is clipped and you're in your drawer ex method that's all nautic another thing you have to keep in mind is that the layout manager keeps track of all its positions relative to the origin of the text container for the positions of lines and so forth which may not be the same as the origin of your view in fact that organisms so you'll have to translate between coordinate system and it keeps track of the location of positions of glyphs relative to the origin of the line in which they live so there's a certain amount of translation that have to go on and we'll see an example of that so now we have enough to talk about what is more or less the second level of customization where you are actually getting information about where individual pieces of text our position on the screen and the source of all such information is the layout manager layout manager knows all the goop on the layout manager if you need to go from a character range to cliff range or vice versa which you will often need to do you call on the layout manager to get the position of a particular glyph or a petition and pods pick your line or to go backwards and give it a position the locator glyph or given a rectangle locate the glyphs in it all that sort of thing is on the layout manager there are quite a few methods do this it's also possible to subclass the layout manager if you want to customize any of its particular features so for example if you have a custom attribute that you want to affect drawing at the individual glyph level one way to do that is by subclassing and ass layout manager and I give an example of that so let's go on over the demo again well let me see if I can bring this up okay so here I have some chinese test now these characters are beautiful and concise but one thing that they don't necessarily do except especially for someone like me who doesn't read very well is make it obvious how that they're intended to be pronounced so over the years that have evolved a number of schemes for adding some sort of phonetic annotation to characters in some cases the annotation appears above the characters or in some cases it appears decide the characters but either way it makes it crystal clear how these are intended to be pronounced for example this is to be Georgie by son who died but fortunately the dictionary where I got these pronunciations also gave me some clue as the meanings of these characters so we can display that and that will help us to recognize this quotation air from the art of war which might be rendered as if you know your adversary and you know yourself you need not fear the result of a hundred battles so the Texas and doesn't have any built-in facilities for this sort of thing this is all customization how do we do it let's take a look what I've done is to define some custom attributes and I have some code that is fairly simple and kind of simplistic actually that sets these attributes based on a dictionary that I provided it and so what I'm going to show you actually all this code should be available for download from ABC if not now then very soon what I've done is the subclass in a sleigh up major and override the primary draw map that draw with griff range at Point and so what we're going to do here is we're given a glyph range we need to look at some of these attributes so first we convert it back to a character range now before we do any of our own drawing we're going to call on the super method to actually draw the glyph the original if and then the next thing we're going to do is draw all these annotations and it's actually not that complicated what we do is it go through they text the characters in the text storage and we look what we do is here we look for any characters that have our custom attribute and we also have calculated what glyph corresponds to this character and where it's located as far as a point and where it's line lives and then you remember I talked about all the translation that needs to be done well to get from the coordinates of a glyph a as the layout matter gives them to you to coordinates in your view you need to add you need to translate by the origin of the line rectangle that it lives in and by the origin of the container and all that is available this is a very standard idiom and we also get some information about the glyphs and the thought that we're going to use in doing our siding so the value of this attribute is just the little string that we're going to show as an annotation and basically all we do is figure out a wreck where we to put it and some attributes draw with and to destroy the bottom annotations for the meanings are essentially the same the right annotations between fool how are a little more complicated because in that case each glyph has to be positioned individually but i'll let you look at that once you've downloaded this and that I think is all this so let us go back to the slide so now we come to most difficult part of the talk where we discussed and a typesetter as I said and it's typesetters a class that actually performs the layout and that's what Megan Lee makes this topic so complex because layout is inherently complex and as typesetter itself is a mostly abstract superclass if you wanted to provide your own complete layout engine and it's highly replaced the one that's Texas and uses then you can sub that in a typesetter directly but most people probably not going to want to do that the main concrete subclass of ennis typesetter is NF 80s typesetter which performs the standard system layout and if you want to use that for the most part but make some minor modifications to it then you can sub class in its 80s typesetter now this is new for Panther a new class new lots of new public API and it's 80s types that are actually existed before but it was completely private the methods were all different so you can't use it before Panther now what generally happens is that when the layout manager needs a certain portion of text to be laid out it calls on the types that are an asset to lay out a certain number of lines then the typesetter goes back to the layout manager to get information about the glyphs that need to be laid out and it goes to the text container to get information about the geometry where the lines can be placed and then it does its thing it does all the layout and it calls back to the layout measure and tells it what it did tells it where each line went which glyphs went in line and where all the glyphs the position in the line and at this point the typesetter is allowed to insert or modify cliffs in the glyph stream and it tells the layout manager about that too for example as I said if it's doing hyphenation it may need to insert a hyphen now for those have you been waiting for it now in Panther we have implemented truncation with ellipses that is no now implemented the types that are level so you can use it and in that case the typesetter would need to work with the glyph dream to make sure they look sources in there and it may happen in the number of cases that a certain glyphs need to be modified if they should appear at the end of the line and in that case the types that are would have to do that at this stage because it's only the typesetters knows which where the end of the line is and NSF to acs typesetter has a number of methods and they're divided into several different groups for several different purposes there is a interface that is intended primarily for sub pastors who want to modify layout in the text system and they're allowed to do various things to that always Gus later on there is also a glyph storage interface to annex 80th typesetter that has a slightly different purpose the purpose of the glue storage interface it may be that in some cases you want to use NS 80s types that are by itself without any of the rest of the text system and what the glyphs stories interface does is to encapsulate all the calls that the layout manager Mick that the types that are accuse me makes back to the remainder of the text system so you can override that and replace all this interaction with your own custom method of storing cliffs or storing text or what have you and what this allows you to do is to make use of the system line layout algorithms without having to use any of the rest of the text system if that is what you want to do but in most cases if you're going to sub bass in it's the 80s typesetter it's going to be because you want to make some custom modification to lay out that it does so what you can do with this is that you can be notified as the text is being laid out you allowed to modify the position and size of the line fragments as the lines are being laid out you get some control over line breaking hyphenation and so forth so I have a demo of this let's go back to the demo machine this is actually the same demo I had before it would one thing you'll notice is that as the annotation secure and disappear the height of the line changes correspondingly and to do that I actually sub fast and a typesetter and implemented a particular method it has this is also the means for example by which I chat make sure that the paragraphs of text line up with little pictures of your body on the side and what this method does is the types of sub class gets cold whenever a line has been laid out and you get passed by reference the wrecks of the line the glyph range and they used wrecked that is the portion of that rectangle that was actually occupied by text and a baseline and you get a chance to modify them before they get set off to go out manager so what we're doing here is fairly simple again we have we're past in the glyph range we need to convert it back to a character range and we go through it and all we do is we look for our custom attributes and see if we find them make a note of the font that they appear in so we can calculate how much space is actually needed and if we found any and we have some space then we add it to the line fragment and adjust that as we need so that here let me once again so that the line fragment expands but only for those lines that actually have that characters with this attribute all the rest are unaffected all right let's go back to the slides so now it's time to wrap up of course there's no longer any opportunity to go to any further session but you will presumably be able to view all these on DVD or by some other means there have been a number of other sessions on Coco Coco update session discussed briefly some of the changes we made to text for Panther the cocoa tips and tricks session as I mentioned earlier today had an example actually several examples that make use of text for various things we're adding particular for adding drawing to the text view so if you're interested in that you should probably take a look at that session and you can take a look at the code from that which is we have verified now available for download already and there are a number of other sessions that may be interesting for those of you who want to deal with text