[Qt4-preview-feedback] setUnifiedTitleAndToolBarOnMac so slow

[Trenton Schulz]

On 2009-02-09 14:24:02 +0100, Philippe <philwave at gmail.com> said:

> On the Mac (32 bit) only:
> Some time ago I reported that updating actions that have icons and that
> are displayed in Mac main menu, have an incredible performance hit.
> Today I have found that activating the mode:
> setUnifiedTitleAndToolBarOnMac ( bool set )
> 
> is even worse. Updating actions displayed in such tool bar is much much
> too slow (impossible to use in my case, where there are about 40 icons).

Then don't use the unifiedTitleAndToolBarOnMac property. We don't have 
much say in this. It's largely handled by Carbon (or Cocoa). The 
QToolbar is transparent and it has to composite with the gradient 
below. You can try disabling our changes that we do in 
QMainWindow::event() for LayoutRequests to see if that makes a 
difference. The unified toolbar doesn't give us a way of saying that 
our widget has changed its layout.

You can also turn off icons if you don't want them in a menu (using 
Qt::AA_DontShowIconsInMenus) or on an action by action basis.

FWIW, I haven't seen an application that uses a unified toolbar and has 
more than 16 icons.

It still would be good to see an application that shows what is going 
on if only to see if this is a general problem in Qt.

-- Trenton