Review Request 120147: Add frame arount KTextEditor::View, with proper handling of focus and mouse over, for widget themes that support it

[Hugo Pereira Da Costa]

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https://git.reviewboard.kde.org/r/120147/
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Review request for KDE Frameworks and Christoph Cullmann.


Bugs: 158379
    https://bugs.kde.org/show_bug.cgi?id=158379


Repository: ktexteditor


Description
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Short description is in title and bug report.
The idea is to implement sunken frame in KTextEditor::View (kate, kwrite, etc.) with 'native' focus and mouse-over effects for styles that support it.
This makes KateView look again like QTextEdit

Some changes are needed to the layouting in order to accomodate a frame either around the contents only, or around contents+scrollbar, depending on style hint.

The detail changes are:
- Use QGridLayout for setting up View layout 
- Added QSpacerItems in order to properly implement frame around edition area. 
- properly account for whether style requires frame around contents only, or around contents + scrollbars 
- Call style primitive (CE_ShapedFrame) in order to render a frame around the said area, with proper mouse-over and focus set. 
- Adjust scrollbar background based on whether frame must be drawn around contents only, or scrollbars+contents 
- Force update of widget and scrollbars on focusIn and focusOut events


Diffs
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  src/view/kateview.cpp 5faec88 
  src/view/kateview.h d972c03 

Diff: https://git.reviewboard.kde.org/r/120147/diff/


Testing
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Tested with Breeze, Oxygen, Virtuality, and fusion.
The first three have focus and mouse-over effect.
The last one does not, but still, the "correct" frame is rendered, with proper margins.

Tested in Kate, KWrite and KDevelop.
Screenshots attached with kate.


File Attachments
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before
  https://git.reviewboard.kde.org/media/uploaded/files/2014/09/11/d8a70e3b-e5ea-4fae-aeee-df073c801d86__kate-old.png
after (breeze)
  https://git.reviewboard.kde.org/media/uploaded/files/2014/09/11/b9968e2b-9104-4022-ab7d-e89b2ce73116__kate-new-breeze.png
after (oxygen)
  https://git.reviewboard.kde.org/media/uploaded/files/2014/09/11/1be8a8d2-053d-4002-9d83-ad2afd129042__kate-new-oxygen.png


Thanks,

Hugo Pereira Da Costa

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