[Newbies] Sending messages
obrienjs at comcast.net
Fri Jun 15 17:43:19 UTC 2012
I had moved the first box out of the way. I should have mentioned that when I try to change the second box's color I get an error message: MessageNotUnderstood: SecondBox class >> #color:
On Jun 15, 2012, at 9:20 AM, Chris Cunnington wrote:
> Your boxes are piling up. Drag one off the other and you'll see that you did.
> On 2012-06-15, at 11:12 AM, James O'Brien wrote:
>> I typed the following in a workspace and created a rectangle:
>> FirstBox := RectangleMorph new openInWorld.
>> I then changed its color:
>> FirstBox color: Color green.
>> I next created a system category with a RectangleMorph subclass:
>> RectangleMorph subclass: #TestBox
>> instanceVariableNames: ''
>> classVariableNames: ''
>> poolDictionaries: ''
>> category: 'SqueakExperiment'
>> I then used a workspace to create a new rectangle:
>> SecondBox := TestBox new openInWorld.
>> But I could not change its color like I could with the first rectangle:
>> SecondBox color: Color green.
>> How can I change the second rectangle’s color by sending it a message from a workspace?
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