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

[Karan M G <k.kexor@xxxxxxxxx>]

Thanks.
This is what I'm doing now and it works perfectly with minimum code added:

	private static MyShell instance;

	public MyShell()
	{
		if (instance == null)
		{
			instance = this;
			..
			.. whatever was in constructor originally..
			..
		}
		else
			instance.shell.setFocus();
	}


Rich Kulp wrote:
> 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