GTKD - CSS class color "flash" delay

[TheDGuy via Digitalmars-d-learn]

On Saturday, 25 June 2016 at 20:39:53 UTC, Mike Wey wrote:
>
> The constructor accepts an delegate, witch can access it's 
> context so it has access to some of the data.
>
> The functions from GTK are also available like Timeout.add from 
> the linked tutorial: 
> http://api.gtkd.org/src/glib/Timeout.html#Timeout.add
>
>
> You may want to do something like this:
>
> ```
> private void letButtonsFlash()
> {
>     foreach(Button btn;bArr){
>         btn.setSensitive(false);
>     }
>
>     Timeout t = new Timeout(&timeout_delay,5,false);
> }
>
> private bool timeout_delay()
> {
>     for(int i = 0; i < level; i++){
>         Button currentButton = bArr[rndButtonBlink[i]];
>         ListG list = 
> currentButton.getStyleContext().listClasses();
>         string CSSClassName = 
> to!string(cast(char*)list.next().data);
>         currentButton.getStyleContext().addClass(CSSClassName ~ 
> "-flash");
>     }
>
>     return false;
> }
>
> ```

Thanks a lot for your answer, i tried it like this and it works:

     private void letButtonsFlash(){
         foreach(Button btn;bArr){
             btn.setSensitive(false);
         }
         for(int i = 0; i < level; i++){
             Button currentButton = bArr[rndButtonBlink[i]];
             ListG list = 
currentButton.getStyleContext().listClasses();
             string CSSClassName = 
to!string(cast(char*)list.next().data);
             currentButton.getStyleContext().addClass(CSSClassName 
~ "-flash");
         }

         Timeout t = new Timeout(&timeout_delay,1,false);

         foreach(Button btn;bArr){
             btn.setSensitive(true);
         }
     }
     bool timeout_delay(){
         for(int i = 0; i < level; i++){
             Button currentButton = bArr[rndButtonBlink[i]];
             ListG list = 
currentButton.getStyleContext().listClasses();
             string CSSClassName = 
to!string(cast(char*)list.next().data);
             
currentButton.getStyleContext().removeClass(CSSClassName ~ 
"-flash");
         }
         return false;
     }

But i want to flash (e.g. change the CSS class) the buttons one 
by one and not all at the sime time? How am i going to do that?