From: Albert Wagner <alwagner@...>
Date: 2001-07-03T09:13:49+09:00
Subject: [ruby-talk:17171] Re: FXRuby: How to forward a message?

That's great, Barry.   Thank you.

On Monday 02 July 2001 12:09, you wrote:
> > -----Original Message-----
> > From: Albert Wagner [mailto:alwagner@tcac.net]
> > Sent: Friday, June 29, 2001 6:12 PM
> > To: ruby-talk@ruby-lang.org
> > Subject: [ruby-talk:17067] FXRuby: How to forward a message?
> >
> >
> > Do any of you FOX users know how to forward a message?  How to use
> > FXDelegator?
>
> Hi Albert,
>  I don't have any experience using FXDelegator, but I just found this old
> foxgui-users
> e-mail from Lyle.
>
> Barry
> ***************************************************************
>
> > I am doing something like below using FXRuby
> >
> > FXButton.new(..., getMyTarget(),ID_MyOwn,...)
> >
> > getMyTarget() returns the widget that will be different ones
> > during runtime.
> > Then I realized that FOX will map to the object it first gets and can
> > not change it during runtime unless using "setTarget". I have many
> > buttons that need to send message to newly created widget during runtime.
> > Having to setTarget in several handlers for all these buttons is awkward.
> > I have been using GTK and the callback mechanism make it trivial to do
> > this.
> > Would it be possible to trick FXRuby to  do dynamic binding?
>
> Ted,
>
> I think the FXDelegator class is what you're looking for. An FXDelegator is
> an object that forwards all incoming messages to some other object. Let's
> say you have five different buttons that should send their messages to the
> same object -- but that target object is going to change at runtime. You'd
> do something like this:
>
> 	# Initially the delegator will send all its messages
> 	# to the object "initialTarget"
> 	delegator = FXDelegator.new
> 	delegator.setDelegate(initialTarget)
>
> 	# Each of these buttons will send their messages to
> 	# the delegator, which in turn will forward those
> 	# messages to "initialTarget"
> 	btn1 = FXButton.new(p, txt, icn, delegator, ID_BUTTON1, ...)
> 	btn2 = FXButton.new(p, txt, icn, delegator, ID_BUTTON2, ...)
> 	btn3 = FXButton.new(p, txt, icn, delegator, ID_BUTTON3, ...)
> 	btn4 = FXButton.new(p, txt, icn, delegator, ID_BUTTON4, ...)
> 	btn5 = FXButton.new(p, txt, icn, delegator, ID_BUTTON5, ...)
>
> 	... time passes ...
>
> 	# We now want those five buttons' messages to go to "newTarget"
> 	newTarget = FXSomething.new(...)
> 	delegator.setDelegate(newTarget)
>
> Hope this helps,
>
> Lyle
>
>
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