Re: [Fxruby-users] Usage FXList : makeItemVisible

[SIMOKAWA h. <h-s...@aa...>]

Hello all, and thanks for all.

I understand and the 'makeItemVisible' is working very well.



Lyle Johnson <jl...@cf...> wrote:

> SIMOKAWA hajime wrote:
> 
> > Another Question:
> > The 'makeItemVisible' is not working just after 'clearItems'.
> > A 'create' is need before 'makeItemVisible'.
> 
> When you call clearItems() and, subsequently appendItem(), on the list, 
> the list's layout is marked as dirty but it is not immediately 
> reconciled. FOX uses a technique of delayed layout, which is described 
> on this page from the FOX documentation:
> 
> 	http://www.fox-toolkit.org/guiupdate.html
> 
> Under normal circumstances, the GUI layout will not actually be 
> reconciled until we return to the main FOX event loop, i.e. until we 
> exit the callback for @btnV9. The problem in your case is that 
> makeItemVisible() assumes that the list's layout has already been 
> reconciled, which it hasn't. So the solution is to do *something* to 
> force the layout to be reconciled immediately, before the call to 
> makeItemVisible(). Calling create() on the main window is one way to do 
> this, but the more proper way is to call the FXApp#forceRefesh method:
> 
> 	@btnV9.connect(SEL_COMMAND) {
> 		update_list
> 		app.forceRefresh	# reconcile layout immediately!
> 		@lst.makeItemVisible 9
> 	}
> 
> > But when not just after, the 'create' is needless.
> 
> Correct. In this case, the calls to clearItems() and appendItem() in 
> @btnUp's callback:
> 
> 	@btnUp.connect(SEL_COMMAND) {
> 		update_list
> 	}
> 
> Mark the list's layout as dirty, and shortly after we re-enter FOX's 
> main event loop, the GUI layout is reconciled. Now any subsequent call 
> to makeItemVisible() will work properly.
> 
> Hope this helps,
> 
> Lyle
> 
> 
> 
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