Qt Contributors Summit 2019 - Qt Wayland Client and extensions

Items with importance to KDE

• layer-shell is interesting for KDE
  • there is an extension project for it, qtlayershell, but it uses internal API, and initialization order is difficult if this is not done inside qtwayland.
• primary-selection (middle-click paste)
  • this has already been implemented (in Qt 5.14)
• text-input version 3 is not usable for Qt and version 2 is unofficial. This is problematic for cross-toolkit support.
  • Jan Arne Peternsen will look into it and propose a version 4 for wayland-protocols.
• Recent proposed changes in xdg_popup may put unnecessary burden on compositor developers. However, the consequences of ignoring the spec and continuing as before may not be that serious.

Other topics/comments

• wp_viewporter on the client side
  • Could be interesting for things like embedding video in an application without client side scaling.
    • Would be useful with a real use-case/project to drive this. Talk to VLC?
• In widgets qobject parent == layout parent, this causes problems, might be solved by having separate layout parents, however, we don't want to make widgets more complex than necessary.
• David Edmundson has a patch for semantic layouting of popups, will push it to gerrit.
• Platform-specific API
  • Some platform-specific API can go in private headers without binary compatibility guarantees (similar to QPA API).
  • Other API can be public in the QtWaylandClient module
    • wl_surface created/destroyed signals and getters
• Color correction would be interesting to look at
• Pier Luigi Fiorini (liri-shell) has been looking into pointer-constraints and relative-pointer extensions.
• Support for tablet protocol would be nice