Thanks to Nuno for providing the QML based scrollbar. Obviously
this does not improve the consistency with other widget styles, so
a proper solution is still required.
BUG: 291612
In some unfortunate situations it is possible that a window is deleted
before it is marked ready_for_painting=true. The last point is
especially troublesome for effects that reference the deleted window.
Many thanks to Elias Probst for all the testing.
CCBUG: 290025
CCBUG: 288948
REVIEW: 103733
This includes the delegates, the layout configuration for the delegates
and the custom view for the TabBox.
This can now finally be done as desktop tabbox is based on QML, too.
Buttons are exported as a global "options" in the factory.
Additionally the theme's buttons are also exported. The thme decided
based on the custom button positions property which one to use.
In the kcm the button options are also exported.
Each decoration gets a graphicsview and scene instead and a declarative
item is created for each decoration.
There's probably still room for improvments. E.g. never render the
scene onto the widget but directly into the textures?
Switches to the explicit maximized decoration element and animates
the button groups and caption.
Legacy support for just the centered element is still missing. Unsure
if it should be added or if it makes sense to break compatibility here.
What's working:
* background for active and inactive decorations inclusive transitions
* all buttons get loaded
* transition between button states
* all borders, paddings etc is working
* mouse interaction with buttons and title area
What's not yet working:
* special maximize mode
* mouse wheel on title area
* window tabs
* changing themes
* crash resistence (currently a not compiling QML file crashes KWin badly)
* window/blur mask (tricky - we need the alpha mask of the background SVG)
What's going to be dropped:
* special opaque mode
* decoration position at left/right/bottom instead of top
Why? Because nobody uses these features
