[news.eclipse.platform.swt] Re: General UI: Preventing shell/dialog from

[Rich Kulp <richkulp@xxxxxxxxxxxxxxxxxx>]

You could simply have an instance variable for each dialog that can be 
open only once at a time and have a different method for each dialog that

(a) checks if the instance variable is not-null and open, then just give 
it focus
(b) if not then create the dialog, assign to the instance variable, and 
open it.

That way you don't need a list that you would search through to see if 
open because you already have to have special code to launch each one, 
so just use the instance variable and find it directly.

Karan M G wrote:
> Hello,
>
> I am making my first SWT application which has a menu on the shell and 
> several dialogs and other shells which can all be opened by clicking 
> buttons, menu items, tree items etc. When a menu item is clicked it 
> opens up a dialog box. Now if I click the menu item again, another 
> instance of the same dialog will open up which is redundant and possibly 
> erroneous. Some of these dialogs are not necessarily application modal 
> (eg. About box, Welcome screen, Help etc.).
>
> One way I can think of preventing a window from opening if already open 
>  is keeping a list of opened shell/dialog in the primary UI class and 
> checking the list before opening the shell/dialog.
>
> I want to know if there is a general way or a better way of solving this.
>
> Thanks,
> Karan

--
Thanks,
Rich Kulp