I'll try to give you a scenario for a simple project:
Click on any class in the browser. You will see the class definition that will
look somewhat like this (I replaced actual names with placeholders):
<superclass> subclass: #<name of your class>
instanceVariableNames: '<instVar1> <instVar2>'
classVariableNames: ''
poolDictionaries: ''
category: '<name of your project category>'
For this example let's use this:
Object subclass: #MyCalculator
instanceVariableNames: ''
classVariableNames: ''
poolDictionaries: ''
category: 'GCal'
Once you have the class definition you want, hit ctrl+s (or cdm+s on Mac) and
the browser will show you your new category in the leftmost panel, containing
your new class MyCalculator which is a subclass of Object.
Go to the third panel from the left. This panel contains "protocols" (method
categories). You will see something like "no messages". Click on that label and
you will be presented with a method template.
Your first method:
add: aMoney to: anotherMoney
^ aMoney + anotherMoney
Again, hit ctrl+s once your finished. Now of course we'll need a money class
that understands the #+ selector:
Object subclass: #Money
instanceVariableNames: 'value'
classVariableNames: ''
poolDictionaries: ''
category: 'GCal'
Define the message #+ for the class Money:
+ aMoney
^ self value + aMoney value
And define the method value:
value
^ value
Once you save the method #value you'll be asked if you want 'value' to be an
instance variable or a temporary variable. Make it an instance variable.
In the browser below the panel with the classes, click on 'class' to see "class
side" methods and define the method #value: :
value: aNumber
^ self new
initializeWith: aNumber;
yourself
Go back to the "instance side" of the class and define the method
#initializeWith: :
initializeWith: aNumber
value := aNumber
Open the world menu and open a workspace
Type this in the workspace:
MyCalculator new add: (Money value: 30) to: (Money value: 20)
hit ctrl+p to print the result (hopefully 50, I haven't tested the example :) )
You would follow the same steps to enhance your application further. Now you
should take a look at Monticello to learn how to manage versions of your
application.
Hope this helps a bit.
Cheers,
Max
On 05.01.2012, at 09:26, Gerry Weaver wrote:
> Hi Max,
>
> Okay thanks. I think I get the startup scenario now.
>
>
> I come from the other end of the world in terms of software development
> (kernel, C, command line, etc.). I guess the part that's giving me a hard
> time is really the IDE workflow. I want to start writing code, but I feel
> kind of like I'm trying to build a ship in a bottle. What I would expect is
> that I would create some kind of project spec and add my code to that, but
> instead I'm finding this rather strange path. I assume that it's all about
> defining classes, but I'm having trouble figuring out where and how to do
> that. For example, is an application a category or is it just a way to group
> like functionality? Collections look like they are a tool for organizing
> code? Anyway, I'm going to keep plugging away at it. I kind of hoping maybe
> Visualworks will fill in some of the blanks.
>
>
> I recently left my job as a full time developer. There are several projects
> that I've been thinking about over the last few years. Since I am now a force
> of one, I'm looking for a higher level (hopefully more productive) language
> to code in. One of the things that attracted me to Smalltalk was the concept
> of the image and something called "Opentalk". Most of the applications I have
> in mind would be distributed in nature. However, a web interface wouldn't be
> completely out of the question. The FFI is also something that will be
> critical for me. I have quite a bit of C code that I will want to make use
> of.
>
>
> I have watched several of the screencasts, but they seem to leave out the
> part that I am having trouble with. I am still actively searching though.
>
>
> Thanks,
> Gerry
>
>
> -----Original Message-----
>> From: "Max Leske" <[email protected]>
>> To: [email protected]
>> Date: 01/05/12 01:55
>> Subject: Re: [Pharo-project] Pharo by Example
>>
>> Hi Gerry
>>
>> From your talk of application entry points it seems to me that you might be
>> talking about web development with Pharo. In that case PharoByExample won't
>> help you much.
>> Maybe, if you could tell us what you are trying to accomplish, we would be
>> able to help you better. Right now, at least to me, it is not clear why you
>> are having troubles. I've learnt Smalltalk with PBE and Pharo and found
>> everything to be fairly straight forward and clearly explained.
>>
>> As for the #init method, the only one I can find belongs to the ParseStack
>> object. That is definitely not what you want. What might be confusing you is
>> that you don't "execute" a binary like you would in other cases. Pharo is
>> not only an IDE but it is also the runtime environment.
>>
>> It just occurred to me, that you might be looking for something like: "if i
>> double click on the image I want my application X to be launched in the
>> image". That can certainly be done but is not the usual way. More often, you
>> will save the image with the "start UI" of your application opened, so that
>> when a user opens the image he will see one window with your application.
>>
>> You also might want to check out the Pharo Screencasts
>> (http://www.pharo-project.org/documentation/screencasts), you might see
>> something there that helps you to better understand Pharo. However, from
>> what I have experienced I suggest that you just work through PBE and see if
>> your questions persist.
>>
>> Cheers,
>> Max
>>
>> On 05.01.2012, at 06:50, Gerry Weaver wrote:
>>
>>> Hi,
>>>
>>> Perhaps I should just take a shot at explaining what I'm having trouble
>>> understanding.
>>>
>>>
>>> My current take on the environment is that an image is basically a
>>> container that holds everything in the application. In development mode it
>>> also includes the IDE and tools. I assume one would typically start by
>>> defining a class that was a subclass of some system or package class. I
>>> assume this process would continue until the application logic and data
>>> were defined. I also assume that there must be a way to indicate the class
>>> that represents the top level or entry point (main) of the application.
>>> That appears to be the init method. Is this anywhere close to being correct?
>>>
>>>
>>> The problem is that I'm not sure how to get started. I have played around
>>> with the system browser a bit. I can see that you would create a category
>>> and be presented with what looks to be a template for a class. I'm confused
>>> about the fact that the "Pharo by Example" has me creating a package when I
>>> don't see that in the 1.3 browser. I also don't know how to create
>>> additional classes in that category or how to tell the environment which
>>> class is my application entry point. I figure maybe the answer to all of
>>> this is a little too much for a mailing list question, which is why I
>>> didn't start out asking this. Anyway, at least this gives you an idea of
>>> where I'm stuck. Maybe my brain just isn't wired to understand something
>>> that may be obvious to others.
>>>
>>>
>>> Thanks,
>>> Gerry
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>>> From: "Serge Stinckwich" <[email protected]>
>>>> To: [email protected]
>>>> Date: 01/04/12 23:04
>>>> Subject: Re: [Pharo-project] Pharo by Example
>>>>
>>>> On Thu, Jan 5, 2012 at 11:45 AM, Gerry Weaver <[email protected]> wrote:
>>>>> Hi,
>>>>>
>>>>> I've been trying various downloads, but I haven't found anything that
>>>>> works. I guess I may be making it harder than it needs to be, but I
>>>>> really have no idea how to proceed. I've been trying to find some doc on
>>>>> basic things like creating a package, class, etc., but I'm not having
>>>>> much luck. I assume the docs will be updated at some point. Would anyone
>>>>> have a feel for when that might be? I'm not in a hurry at all, so I could
>>>>> wait for a couple of more versions.
>>>>
>>>> Could give us more information about what is not working exactly ?
>>>> Did you upload the file here:
>>>> https://gforge.inria.fr/frs/download.php/27023/PBE-1.0.zip
>>>> and try the exemple in the book ?
>>>>
>>>> Regards,
>>>> --
>>>> Serge Stinckwich
>>>> UMI UMMISCO 209 (IRD/UPMC), Hanoi, Vietnam
>>>> Matsuno Laboratory, Kyoto University, Japan (until 12/2011)
>>>> http://www.mechatronics.me.kyoto-u.ac.jp/
>>>> Every DSL ends up being Smalltalk
>>>> http://doesnotunderstand.org/
>>>
>>>
>>>
>>>
>
>
>
>
