Re: Cocoa et al as HCI usability problem
Re: Cocoa et al as HCI usability problem
- Subject: Re: Cocoa et al as HCI usability problem
- From: Peter Duniho <email@hidden>
- Date: Mon, 19 May 2008 11:00:31 -0700
On May 19, 2008, at 10:48 AM, Greg Titus wrote:
You've translated the Objective-C syntax into C# syntax, but the
point of the question is to think about what
prepareWithInvocationTarget() does. How would you write that method
in C#?
Well, it was a poorly stated question then. His primary presentation
asked how I'd write the code he posted, not the supporting
implementation details.
In Objective-C, after you call -prepareWithInvocationTarget: on an
NSUndoManager, it then accepts _any_ message call of any kind. It
is completely and totally dynamic. It accepts messages from your
application which weren't defined and didn't exist when the
NSUndoManager class was compiled. The undo manager accepts the
message, saves the target and method invocation with an arbitrary
number of arguments and is able to re-invoke it later on the
original target when the user asks you to Undo.
Thanks. That certainly makes the example more clear, and make more
sense.
That said, because of the existence of reflection in C# and Java,
similar functionality isn't really that difficult in those
languages. It's trivial to take any arbitrary class or instance of a
class and invoke any arbitrary named method with an arbitrary number
of arguments, immediately or later as necessary.
I would agree that in the light you've offered, the NSUndoManager
offers a somewhat more compelling use case than previous examples.
But it's not true that the C# or Java version would be significantly
different. They would be only slightly more verbose (though yes, I
admit...they would be more verbose, albeit slightly).
Pete
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