atomicy in gui draws

[elcuco]

Hi,

I have faced a problem on my mdi library, which I cannot fully understand. The problem is that when you move the focus from one tab to another, and both contain the same type of toolbars, the toolbars flick a lot (see how it's done on KDE for example).

What happens when you move the focus to a tab is:

QToolBar* qmdiActionGroup::updateToolBar( QToolBar *toolbar )
{
	if (!toolbar)
		toolbar = new QToolBar( name );
 
	toolbar->clear();
	int i = 0;
	foreach( QObject *o, actionGroupItems )
	{
		QAction *a = qobject_cast<QAction*> (o);
		if (a)
			toolbar->addAction( a );
		else
		{
			QWidget *w = qobject_cast<QWidget*> (o);
			if (w)
			{
				toolbar->addWidget( w );
				w->setVisible(true);
			}
		}
 
		i++;
	}
 
	if (actionGroupItems.count() == 0)
		toolbar->hide();
	else
		toolbar->show();
 
	return toolbar;
}

QToolBar* qmdiActionGroup::updateToolBar( QToolBar *toolbar )
{
	if (!toolbar)
		toolbar = new QToolBar( name );

	toolbar->clear();
	int i = 0;
	foreach( QObject *o, actionGroupItems )
	{
		QAction *a = qobject_cast<QAction*> (o);
		if (a)
			toolbar->addAction( a );
		else
		{
			QWidget *w = qobject_cast<QWidget*> (o);
			if (w)
			{
				toolbar->addWidget( w );
				w->setVisible(true);
			}
		}

		i++;
	}

	if (actionGroupItems.count() == 0)
		toolbar->hide();
	else
		toolbar->show();
	
	return toolbar;
}

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As you see, the toolbar will be cleared and populated by the same icons (but different QActions). I tried solving this by adding a toolbar->setUpdatesEnabled() but still I see the flicks. I also tried to lock up the main window, and I still see the flicker.

Does anyone know some good trick that can help me?

For details about qmdilib see:
http://www.qtcentre.org/forum/f-qt-s...-001-2602.html

[gfunk]

I found that some layouts in my ui would still do some weird painting even with updates disabled, until I setVisible(false) on the layouts in addition. You might want to step through the paint source code, if possible.

[elcuco]

Thanks,

Using setUpdatesEnabled(false) and then hide() does help a lot.

I am not marking this a "solved" as there are some issues yet. It helps a lot, but I still have problems.