D12820: Add KWayland virtual desktop protocol

[Roman Gilg]

romangg added a comment.


  In D12820#263516 <https://phabricator.kde.org/D12820#263516>, @mart wrote:
  
  > but then... how to manage collisions? allowing to set the same row/column to different desktops and make kwin responsibility of this not happening?
  
  
  For a layout change the compositor would give KWayland a complete matrix of all virtual desktops indicating their new positions. So KWin would need to make sure that:
  
  - every cell in the matrix only has one VD object referenced (this is per definition if the matrix is `QVector<QVector <VirtualDesktopInterface*>>` ),
  - the matrix contains all available VDs.
  
  The compositor would calculate the new matrix internally (it knows about all available VDs and their current positions through KWayland) and then call:
  
  1. `PlasmaVirtualDesktopManagementInterface::layout(QVector<QVector <VirtualDesktopInterface*>> matrix)` containing all VDs,
  2. `sendDone()`.
  
  On the other side when the compositor wants to create a new VD, it would call:
  
  1. `PlasmaVirtualDesktopManagementInterface::createDesktop()`,
  2. `PlasmaVirtualDesktopManagementInterface::layout(QVector<QVector <VirtualDesktopInterface*>> matrix)` containing all VDs including the new one,
  3. `sendDone()`.

REPOSITORY
  R127 KWayland

REVISION DETAIL
  https://phabricator.kde.org/D12820

To: mart, #kwin, #plasma, graesslin, hein
Cc: bshah, romangg, kde-frameworks-devel, michaelh, ngraham, bruns
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