fxruby users - Jan 2009 - How to iterate an array within an event

Hi all,

I have an array and here is what I try to accomplish:

click the @button_next,assign the first element to the radioButton of @radio

click the @button_next again, assign the second element to the same radioButton
(overwrite the text or update the text)

and so on, untill all the elements are iterated.


I write the codes as follows. But when I run it I only see the last element 5 on
the @radio. I wonder someone can
explain to me what is going on and help me fix it.


Thanks,

Li


###################
def press_next
	@array=["1","2","3","4","5"]

	@array.each do |e|
	    @button_next.connect(SEL_COMMAND) do
		@radio.text="#{e}"
    	    end
	end
end

On Mon, Jan 5, 2009 at 6:44 PM, chen li <chen_li3 at yahoo.com> wrote:
> I have an array and here is what I try to accomplish:
>
> click the @button_next,assign the first element to the radioButton of
@radio
>
> click the @button_next again, assign the second element to the same
radioButton (overwrite the text or update the text)
>
> and so on, untill all the elements are iterated.
>
>
> I write the codes as follows. But when I run it I only see the last element
5 on the @radio. I wonder someone can
> explain to me what is going on and help me fix it.
<snip>

Your loop over the array elements is currently written this way:

    @array.each do |e|
      @button_next.connect(SEL_COMMAND) do
        @radio.text="#{e}"
      end
    end

This is equivalent to (for example):

    @button_next.connect(SEL_COMMAND) { @radio.text = "#{@array[0]}" }
    @button_next.connect(SEL_COMMAND) { @radio.text = "#{@array[1]}" }
    @button_next.connect(SEL_COMMAND) { @radio.text = "#{@array[2]}" }
    @button_next.connect(SEL_COMMAND) { @radio.text = "#{@array[3]}" }
    @button_next.connect(SEL_COMMAND) { @radio.text = "#{@array[4]}" }

Do you see now why clicking @button_next just changes the radio
button''s text to "5"? Every time you call
@button_next.connect(),
you''ve overwriting the previous block that you had associated with
that event.

You need to do something to keep track of what the current value of
the radio button is, and increment that value each time @button_next
is clicked. For this particular example, the following code ought to
work:

   
@array=["1","2","3","4","5"]
    @current_index = 0
    @radio.text = "#{@array[@current_index}"
    @button_next.connect(SEL_COMMAND) do
      @current_index = @current_index + 1
      @current_index = 0 if @current_index >= @array.length
      @radio.text = "#{@array[@current_index}"
    end

I''m guessing your real code has a more complicated data structure, but
this is the idea.

Hope this helps,

Lyle

Hi Lyle,

Thank you very much. I think I grasp the idea/format on how to do the iteration 
in FXRuby by reading your code.


One more question: I want to iterate a slice(here is 5) from an array. Here is
my code. Is it the best way to iterate a slice?


Li

######################
def press_next
	@all=("1".."1000")

		index1=0
		index2=1
		index3=2
		index4=3
		index5=4
	@button_next.connect(SEL_COMMAND) do
	
index1,index2,index3,index4,index5=[index1,index2,index3,index4,index5].sort_by{rand}

		@radio1.text=@all[index1]
		@radio2.text=@all[index2]
		@radio3.text=@all[index3]
		@radio4.text=@all[index4]
		@radio5.text=@all[index5]

		index1	+=5
		index2	+=5
		index3	+=5
		index4	+=5
		index5	+=5
	end
end

On Jan 6, 2009, at 3:17 PM, chen li wrote:
> One more question: I want to iterate a slice(here is 5) from an  
> array. Here is my code. Is it the best way to iterate a slice?
I think you probably want to make the index counters (index1,  
index2, ...) instance variables instead of local variables. But I  
guess it''s OK otherwise.