D5106: Add support for activating screenedges through touch swipe gestures

[Martin Gräßlin]

graesslin created this revision.
Restricted Application added a subscriber: plasma-devel.
Restricted Application added a project: Plasma on Wayland.

REVISION SUMMARY
  Each Edge creates a SwipeGesture for touch activation. The swipe needs to
  be a single finger starting from the edge into the screen for at least
  20 %. The SwipeGesture and GestureRecognizer is extended to support the
  use cases of the touch screen edge swipe.
  
  New features supported by the gesture system are:
  
  - minimum and maximum position
  - a minimum delta for the swipe
  - progress signal based on the minimum delta
  - starting a swipe with a start point
  
  The Edge has the progress signal connected to its approach signal, thus
  visual feedback is provided through the screen edge effect.
  
  The screen edge system supports touch only for the edges (corners are
  too difficult to activate on touch screens). At the moment the following
  features are supported:
  
  - screen edge show/raise of windows (e.g. auto hidden panels)
  - trigger the configured action
  - trigger the configured callback function (e.g. script)
  
  In future it might make sense to add a touch specific configuration
  action to support different actions for screen edges activated by mouse
  and touch.
  
  BUG: 370323

TEST PLAN
  configured a screen edge and triggered through touch,
  added an auto-hiding panel and triggered through touch

BRANCH
  screenedge-touch

REVISION DETAIL
  https://phabricator.kde.org/D5106

AFFECTED FILES
  autotests/CMakeLists.txt
  autotests/test_gestures.cpp
  gestures.cpp
  gestures.h
  input.cpp
  screenedge.cpp
  screenedge.h

To: graesslin, #kwin, #plasma_on_wayland
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, eliasp, sebas, apol
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