KFadeWidgetEffect bugfix

Rafael Fernández López ereslibre at kde.org
Thu Feb 21 17:45:18 GMT 2008


> that's the setGeometry call getting "wrong" numbers

I don't think so. Is about making it a child of the passed widget parent. 
While it is not being layouted (that will happen later), the widget lives at 
the top left bottom. When the widget is layouted, it is removed from there 
and goes on the position it should. On the meanwhile you see a flickering 
that is what I'm talking about. When opening systemsettings and entering on 
some category, you will see all KTitleWidget of each KCM on the top left for 
a second, then after that, they dissappear, and are moved to their correct 
positions (because their layout code was run).

> > As the widget developer user, I'd like to know who the parent is, maybe
> >
> > MyWidget(QWidget *parent)
> >         : QWidget(parent->parent());
> >
> > I really think is better to do it as the patch does:
> >
> > MyWidget(QWidget *parent)
> >         : QWidget(parent)
> I don't understand what you're trying to say. Did you ever read the apidox?
> The problem is that if you make KFadeWidgetEffect a child of the widget
> you're about to take a snapshot of, then the child will be asked to paint
> itself, too. Which is not what is wanted here. I.e. the fade widget may not
> be a child of the widget that is to be animated.
> See attached patch for what I think you wanted to fix.

Always that your patch or mine had:

-    : QWidget(destWidget && destWidget->parentWidget() ? 
destWidget->parentWidget() : destWidget)
-    , d_ptr(new KFadeWidgetEffectPrivate(destWidget))
+    : QWidget(destWidget ? destWidget->parentWidget() : 0),
+    d_ptr(new KFadeWidgetEffectPrivate(destWidget))

The flickering is removed. About the other stuff, I don't understand why we 
can't do the deleteLater() on the constructor. Anyway, if that's for safety 
because of code doing widget->start() when widget had been deleted with no 
notice, I'm ok. About your latest patch, well, yes... is the same. For being 
honest I didn't try the latest patch I sent because kdelibs weren't linking 
correctly for a while for me.

So, that means, I'm ok with your patch if the hide() is needed. Actually is 
the only difference that yours and last mine had.

Rafael Fernández López

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