[Differential] [Request, 367 lines] D3363: Support interactive window selection through the Platform

[graesslin (Martin Gräßlin)]

graesslin created this revision.
graesslin added reviewers: KWin, Plasma.
Restricted Application added a project: KWin.
Restricted Application added subscribers: kwin, plasma-devel.

REVISION SUMMARY
  A new virtual method is added to Platform:
  startInteractiveWindowSelection
  
  The interactive window selection enters a mode where the user can select
  a window through the pointer or keyboard device. The cursor is turned
  into a crosshair cursor, unless another cursor name is provided (e.g.
  pirate for kill window).
  
  Once a window is selected the provided callback method is invoked with
  the selected Toplevel as argument. In case the user cancelled the
  selection a nullptr argument is passed in.
  
  Currently it's only implemented by the X11 standalone platform using the
  logic from KillWindow. Just instead of killing the window the callback
  is invoked.
  
  KillWindow loses the X11 implementation and interacts with the new
  functionality in Platform by providing a lambda function for the
  killing.

TEST PLAN
  Killing of X11 windows is still possible

REPOSITORY
  rKWIN KWin

BRANCH
  interactive-window-selection

REVISION DETAIL
  https://phabricator.kde.org/D3363

AFFECTED FILES
  killwindow.cpp
  killwindow.h
  platform.cpp
  platform.h
  plugins/platforms/x11/standalone/CMakeLists.txt
  plugins/platforms/x11/standalone/windowselector.cpp
  plugins/platforms/x11/standalone/windowselector.h
  plugins/platforms/x11/standalone/x11_platform.cpp
  plugins/platforms/x11/standalone/x11_platform.h
  utils.h

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: graesslin, #kwin, #plasma
Cc: plasma-devel, kwin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas
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