From: lolveley <lolveley@...>
Date: 2009-05-13T04:16:20+09:00
Subject: Re: (mandriva,eclipse,Qt) elementary problem : signals and slots

hi stefano,

I tried your example and it works fine, but I find this is not very 
simple, indeed this is a basic example : what would it be for a more 
complicated example?

lolveley.


Stefano Crocco a �crit :
> On Monday 11 May 2009, lolveley wrote:
>   
>> |hi,
>> |
>> |I would like to make a little program using Qt : it's a displayer /
>> |converter between farenheit and celsius degrees.
>> |I also want to use QtDesigner.
>> |
>> |I made a little widget with QtDesigner, and this widget contains two
>> |dials(dial and dial_2) and two spinboxes(kind of textboxes) (spinbox and
>> |spinbox_2).
>> |There are some connections : see below for the ruby file I obtained with
>> |the tool rbuic4 (which converts the ".ui" file into ".rb").
>> |my problem is this : I want that some changes made in dial_2 modify dial
>> |(and then spinbox), eg :
>> |    0 celsius degrees => 32 farenheit degrees.
>> |
>> |here is the file made by rbuic4 and after this my try to modify the slot
>> |setValue (but it doesn't run: the value of dial is always the same as
>> |the one of dial_2.
>>     
>
> I don't know why it doesn't work, as I never used the designer to make 
> signal/slot connections. I'd say it should work, but there might be some 
> limitations which I'm not aware of. My suggestion is to use a custom widget 
> class instead of a generic Qt::Widget and to implement the slot which converts 
> the values there. Here's how the tmp_dsc_form.rb could look like:
>
> require 'Qt4'
> require 'temp.rb'
>
> class MyWidget < Qt::Widget
>   
>   slots 'change_values(int)'
>   
>   def initialize
>     super
>     @ui = Ui_Form.new
>     @ui.setupUi self
>     connect @ui.dial_2, SIGNAL('valueChanged(int)'), self, 
> SLOT('change_values(int)')
>   end
>   
>   def change_values val
>     new_value = (1.8*val+32).to_i
>     @ui.spinBox.value = new_value
>     @ui.dial.value = new_value
>   end
>   
> end
>
> une_appli=Qt::Application.new(ARGV)
> un_wdg = MyWidget.new
> un_wdg.show
> une_appli.exec
>
> Of course, if you use this you can remove the connections made from the 
> designer.
>
> I hope this helps
>
> Stefano
>
>
>   


	

	
		
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