Review Request 129204: Add toggle signal for applet de-/activation in order to fix non-closing launchers on Meta (and also on Active Screenedges)

[Marco Martin]

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Ship it!




Ship It!

- Marco Martin


On Oct. 18, 2016, 5:20 p.m., Roman Gilg wrote:
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> https://git.reviewboard.kde.org/r/129204/
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> (Updated Oct. 18, 2016, 5:20 p.m.)
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> 
> Review request for Plasma and Martin Gräßlin.
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> Bugs: 367685
>     http://bugs.kde.org/show_bug.cgi?id=367685
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> Repository: plasma-framework
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> Description
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> # The new Meta-key support for launcher opening doesn't work for closing at the moment. My analysis of the problem was as follows:
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> - KWin calls Applet::activated() over DBus
> - Applet::activated() is connected to AppletInterface::activated()
> - AppletInterface::activated() is connected to setExpanded(true), which can only expand the launcher, but not the other way around
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> # Q: Why is Alt+F1 working though?
> A: The launchers seem to inherit the reimplemented function Dialog::focusOutEvent(..). Atleast when you delete line 1094 in dialog.cpp, which sets the visibility to false, it's not working anymore. Alt+F1 triggers the focusOutEvent(..) as a global shortcut.
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> # Q: Why is it working with the Dashboard though?
> A: The dashboard doesn't use the expanded feature of the plasmoid, but rather connects directly to the AppletInterface::activated() signal and shows/hides an independent widget when this signal gets triggered.
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> # Solution:
> Create new toggled() signal chain in KWin, Applet, AppletInterface, which tests the current expanded state and sets it afterwards accordingly to the opposite. This diff here in plasma-framework is the first one, which the others depend on. The others are on Phabricator:
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> - kwin: https://phabricator.kde.org/D3077
> - plasma-workspace: https://phabricator.kde.org/D3078
> - plasma-desktop: https://phabricator.kde.org/D3079
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> # Need feedback regarding:
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> - Should we remove the activated() signal chain? Is it used somewhere else than KWin?
> - Could a race condition occur if we deexpand the applet while at the same time setting the visibility to false through focusOutEvent()? My tests until now don't suggest it, but I haven't yet looked into it extensively.
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> Diffs
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>   src/plasmaquick/appletquickitem.h 943e227 
>   src/plasmaquick/appletquickitem.cpp 2f100b8 
>   src/plasmaquick/private/appletquickitem_p.h 1436935 
>   src/scriptengines/qml/plasmoid/appletinterface.cpp 1cd6934 
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> Diff: https://git.reviewboard.kde.org/r/129204/diff/
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> Testing
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> Thanks,
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> Roman Gilg
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