From 2a61bfc27d6915877d18a09bc440d462a2051857 Mon Sep 17 00:00:00 2001
From: Selene ToyKeeper <ToyKeeper@users.noreply.github.com>
Date: Wed, 26 Oct 2022 13:49:44 -0600
Subject: add "inertia" mode for mouse keys (#18774)

Co-authored-by: Selene ToyKeeper <git@toykeeper.net>
---
 quantum/mousekey.h | 39 ++++++++++++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 11 deletions(-)

(limited to 'quantum/mousekey.h')

diff --git a/quantum/mousekey.h b/quantum/mousekey.h
index da2edb481a..e968e000c0 100644
--- a/quantum/mousekey.h
+++ b/quantum/mousekey.h
@@ -36,34 +36,48 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #    endif
 
 #    ifndef MOUSEKEY_MOVE_DELTA
-#        ifndef MK_KINETIC_SPEED
-#            define MOUSEKEY_MOVE_DELTA 8
-#        else
+#        if defined(MK_KINETIC_SPEED)
 #            define MOUSEKEY_MOVE_DELTA 16
+#        elif defined(MOUSEKEY_INERTIA)
+#            define MOUSEKEY_MOVE_DELTA 1
+#        else
+#            define MOUSEKEY_MOVE_DELTA 8
 #        endif
 #    endif
 #    ifndef MOUSEKEY_WHEEL_DELTA
 #        define MOUSEKEY_WHEEL_DELTA 1
 #    endif
 #    ifndef MOUSEKEY_DELAY
-#        ifndef MK_KINETIC_SPEED
-#            define MOUSEKEY_DELAY 10
-#        else
+#        if defined(MK_KINETIC_SPEED)
 #            define MOUSEKEY_DELAY 5
+#        elif defined(MOUSEKEY_INERTIA)
+#            define MOUSEKEY_DELAY 150 // allow single-pixel movements before repeat activates
+#        else
+#            define MOUSEKEY_DELAY 10
 #        endif
 #    endif
 #    ifndef MOUSEKEY_INTERVAL
-#        ifndef MK_KINETIC_SPEED
-#            define MOUSEKEY_INTERVAL 20
-#        else
+#        if defined(MK_KINETIC_SPEED)
 #            define MOUSEKEY_INTERVAL 10
+#        elif defined(MOUSEKEY_INERTIA)
+#            define MOUSEKEY_INTERVAL 16 // 60 fps
+#        else
+#            define MOUSEKEY_INTERVAL 20
 #        endif
 #    endif
 #    ifndef MOUSEKEY_MAX_SPEED
-#        define MOUSEKEY_MAX_SPEED 10
+#        if defined(MOUSEKEY_INERTIA)
+#            define MOUSEKEY_MAX_SPEED 32
+#        else
+#            define MOUSEKEY_MAX_SPEED 10
+#        endif
 #    endif
 #    ifndef MOUSEKEY_TIME_TO_MAX
-#        define MOUSEKEY_TIME_TO_MAX 30
+#        if defined(MOUSEKEY_INERTIA)
+#            define MOUSEKEY_TIME_TO_MAX 32
+#        else
+#            define MOUSEKEY_TIME_TO_MAX 30
+#        endif
 #    endif
 #    ifndef MOUSEKEY_WHEEL_DELAY
 #        define MOUSEKEY_WHEEL_DELAY 10
@@ -78,6 +92,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #        define MOUSEKEY_WHEEL_TIME_TO_MAX 40
 #    endif
 
+#    ifndef MOUSEKEY_FRICTION
+#        define MOUSEKEY_FRICTION 24 // 0 to 255
+#    endif
 #    ifndef MOUSEKEY_INITIAL_SPEED
 #        define MOUSEKEY_INITIAL_SPEED 100
 #    endif
-- 
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