[Interest] About event filter on QApplication

[程梁]

Thank you! I think I do understand your point. I just want to answer his question. And I think I should tell him this point.

Cheng Liang
Nanjing, China
http://www.devbean.net

> Date: Mon, 4 Nov 2013 07:28:08 +0100
> From: bthorsen at ics.com
> To: interest at qt-project.org
> Subject: Re: [Interest] About event filter on QApplication
> 
> You miss Thiagos point. It doesn't make any sense to try and document 
> behaviour for something you shouldn't do. Imagine the size of the docs, 
> if they should say "if you write this broken code, here's what will 
> happen. If you write this...". Your code is broken so there is no 
> interest in finding the difference between Qt 4 and 5 behaviour with it.
> 
> And BTW, you should install the event filter on the label instead of on 
> QApplication and check if the object is the label.
> 
> Bo.
> 
> Den 04-11-2013 02:04, 程梁 skrev:
> > Thank you, Thiago!
> >
> > Yeah, I know return true is not clever. This is a demo code in my Qt
> > text. Someone commented me the differences between Qt4 and Qt5 if return
> > true. I guess the same reason as  you mentioned in last mail. This might
> > because the different processes between the two versions which the
> > documents didn't point out. I just wonder if this is right or I missed
> > some docs.
> >
> > Thank you anyway!
> >
> >
> > Cheng Liang
> > Nanjing, China
> > http://www.devbean.net
> >
> > From: thiago.macieira at intel.com
> > To: interest at qt-project.org
> > Date: Sun, 3 Nov 2013 08:28:16 -0800
> > Subject: Re: [Interest] About event filter on QApplication
> >
> > On domingo, 3 de novembro de 2013 15:21:09, 程梁 wrote:
> >> As you could see, I installed a global event filter on QApplication. Note
> >> that I have returned true in the filter which means all events should stop
> >> processing. In Qt4, the output ("QApplication::eventFilter") will still
> >> there but with Qt5 nothing outputs. This might because watched and
> >> m_watched is not the same (QWidgetWindow). But when I changed to return
> >> false as default code, the output is there again. Maybe in Qt5 the return
> >> value also changes watched objects? I cannot find any documents about this.
> >> Could you help me? Thank you!
> >
> > Returning true for all events is a stupid idea. You're blocking ALL events,
> > including those that Qt needs working in order to make your functionality
> > work.
> >
> > So my conclusion is that you blocked some event that was a precursor to the
> > event sent to the label.
> > --
> > Thiago Macieira - thiago.macieira (AT) intel.com
> >    Software Architect - Intel Open Source Technology Center
> >
> >
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> >
> >
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> 
> 
> -- 
> Bo Thorsen, European Engineering Manager, ICS
> Integrated Computer Solutions. Delivering World-Class Applications
> http://ics.com/services
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