Review Request: New action class proposal: KDualAction

[Christoph Feck]

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trunk/KDE/kdelibs/kdeui/actions/kdualaction.h
<http://svn.reviewboard.kde.org/r/5396/#comment8411>

    Shouldn't this be "setCurrentState(State state)" after your bool->enum conversion?


Additionally, please add a KDualAction camelcased header. Thanks.

- Christoph


On 2010-10-12 15:32:08, Aurélien Gâteau wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> http://svn.reviewboard.kde.org/r/5396/
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> (Updated 2010-10-12 15:32:08)
> 
> 
> Review request for kdelibs.
> 
> 
> Summary
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> 
> This review-request introduces a new class named KDualAction. The goal of this class is to make it easy to create a dual-state action: an action which represents two actions, switching from one to the other whenever it is triggered. KDualAction can be used to implement actions such as the Play/Pause action of a media player or the Reload/Stop action of a web browser.
> 
> Right now some applications mis-use KToggleAction to implement such dual-state actions: They set the first action as the unchecked state and provide an alternative KGuiItem for the checked state with KToggleAction::setCheckedState(). This is wrong because when the user clicks a button representing the action in a toolbar, the button stays down.  The appropriate use cases for toggle buttons (and thus KToggleAction) are documented in a recent addition to the HIG:
> http://techbase.kde.org/Projects/Usability/HIG/Toggle_Buttons
> 
> Potential users for this class:
> 
> - Dragon, Juk, Amarok to implement their Play/Pause action.
> 
> - Rekonq to implement its Reload/Stop action. Konqueror could also use this but it does not feature a dual reload/stop action as far as I know.
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> - Dolphin could maybe use it to implement its Split/Close action (although it's a bit more involved in this case because the close action changes depending on which panel it is going to close)
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> - Any application which incorrectly uses KToggleAction + setCheckedState() to show/hide a UI element (a search on lxr.kde.org shows quite a lot of misuse: http://lxr.kde.org/ident?i=setCheckedState )
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> 
> Diffs
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> 
>   trunk/KDE/kdelibs/kdeui/CMakeLists.txt 1180870 
>   trunk/KDE/kdelibs/kdeui/actions/kdualaction.h PRE-CREATION 
>   trunk/KDE/kdelibs/kdeui/actions/kdualaction.cpp PRE-CREATION 
>   trunk/KDE/kdelibs/kdeui/actions/kdualaction_p.h PRE-CREATION 
>   trunk/KDE/kdelibs/kdeui/tests/CMakeLists.txt 1180870 
>   trunk/KDE/kdelibs/kdeui/tests/kdualactiontest.cpp PRE-CREATION 
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> Diff: http://svn.reviewboard.kde.org/r/5396/diff
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> 
> Testing
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> The class comes with unit-tests. I tested the API made sense by porting Dragon, Konqueror and creating a showHideMenubar action in KStandardAction (review requests to come if the class is accepted).
> 
> 
> Thanks,
> 
> Aurélien
> 
>

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