Review Request 128858: [frameworks] Hide cursor when tablet pen leaves proximity of the screen

[Albert Astals Cid]

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ui/presentationwidget.cpp (line 1305)
<https://git.reviewboard.kde.org/r/128858/#comment68994>

    Why this change?


- Albert Astals Cid


On oct. 5, 2016, 4:20 p.m., Oliver Sander wrote:
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/128858/
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> (Updated oct. 5, 2016, 4:20 p.m.)
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> Review request for Okular.
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> Repository: okular
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> Description
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> I am trying to fix the following papercut:  I regularly write on pdf files in presentation mode, using the pen that comes with my Lenovo ThinkPad Yoga.  When I approach the screen with the pen, the cursor appears, and it follows the pen tip during writing.  When I lift off the pen, the cursor stays on, and auto-hides only a few seconds later (because of Okular::Settings::EnumSlidesCursor::HiddenDelay).  As a consequence, the cursor frequently hides the last bits of what I have just written.  This is a nuisance, because I do this in front of an audience, and a lot of it is math (where every detail matters).
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> Ideally, the cursor would auto-hide when I lift the pen off the screen.  Luckily, Qt has an event for this: QEvent::TabletLeaveProximity.  Unluckily, the documentation says (http://doc.qt.io/qt-5/qtabletevent.html):
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> "TabletEnterProximity and TabletLeaveProximity events [...] are only sent to QApplication"
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> Therefore, this patch introduces a new class TabletApplication, which inherits from QApplication, and is used in main.cpp instead of QApplication.  The proximity events are really caught, and each time a short note is printed on the console.
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> Unfortunately, at this point I am stuck and need some help.  Apparently, I cannot control the cursor from a QApplication.  How do I get the information that a TabletProximity has been caught to the presentation widget? Maybe the answer is trivial, but I have very little Qt programming experience.  Thanks for your help!
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> Diffs
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>   ui/presentationwidget.h 69574d2 
>   ui/presentationwidget.cpp c16d616 
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> Diff: https://git.reviewboard.kde.org/r/128858/diff/
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> Testing
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> Thanks,
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> Oliver Sander
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