Review Request: Fix for CTRL+Tab not switcing tabs in Konqueror when the active tab is a Dolphin filemanagement part

Thomas L├╝bking thomas.luebking at web.de
Tue Sep 25 22:13:27 BST 2012



> On Sept. 25, 2012, 9:03 p.m., Frank Reininghaus wrote:
> > Thanks for analysing this issue and for the patch!
> > 
> > We should of course let those events propagate. However, I'm a bit confused. The docs of QObject::eventFilter() don't mention anything about setting the 'accepted' state of the event. If I understand it correctly, the event is filtered (i.e., not handled further) only if eventFilter() returns true.
> > 
> > Even if your patch fixes the issue, I'm therefore wondering if it just hides the real bug.
> > 
> > I think that what is actually supposed to happen is that DolphinView does not filter the event and that the KItemListView does not handle the event either, such that the unhandled event is passed through to the parent widgets until it ends up in the KonqCombo, such that KonqMainWindow::eventFilter() gets it, right? If that is true, I think the real bug might be that some class pretends to handle the event, such that its parents don't see it, although it does nothing with the event.
> > 
> > I had a quick look at the code and found that KItemListView::event() accepts the event and returns true if m_controller->processEvent() returns true, but does not ignore() the event if that is not the case. I haven't tested it yet, but maybe that is the real problem?

Accepting the event means that it's not further propagated (to the parenting widget)
returning "true" in the event filter means to "eat" the event, ie. prevent regular handling in following eventfilters or even the widget event handling itself.

The patch will ensure that the (input, i assume) event goes up to the parent widget and is handled there if nothing else accepts it.
If you returned true, no further processing would happen at all (ie. even DolphinView::event() would process it)

You should btw. ensure that the parenting QScrollArea accepts it, or oxygen will get bugs because selecting items in dolphin will start to move the window ;-)

Disclaimer: i've not even seen the bug, just generally commented on question and the one-liner diff


- Thomas


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On Sept. 25, 2012, 3:38 p.m., Dawit Alemayehu wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/106569/
> -----------------------------------------------------------
> 
> (Updated Sept. 25, 2012, 3:38 p.m.)
> 
> 
> Review request for Dolphin and KDE Base Apps.
> 
> 
> Description
> -------
> 
> This patch fixes a bug where pressing CTRL+Tab does not switch tabs when active tab in Konqueror is a Dolphin's filemanagement part. It happens because DolphinView installs an event filter and does not call event->ignore() or event->setAccepted(false) to allow those events to be propagated up the event chain.
> 
> 
> This addresses bug 302329.
>     http://bugs.kde.org/show_bug.cgi?id=302329
> 
> 
> Diffs
> -----
> 
>   dolphin/src/views/dolphinview.cpp 0584972 
> 
> Diff: http://git.reviewboard.kde.org/r/106569/diff/
> 
> 
> Testing
> -------
> 
> 
> Thanks,
> 
> Dawit Alemayehu
> 
>

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