From acc217e297172e9680d216659e7354fce89b93af Mon Sep 17 00:00:00 2001
From: Tracy Zhou <tracyzhou@google.com>
Date: Tue, 6 Jun 2023 03:40:01 +0000
Subject: [PATCH] Support showing transient bars upon 3-finger swipe from
 trackpad

Fixes: 285727229
Test: make sure 3-finger swipes from all directions can pull up task bar
and status bar

Change-Id: Ic0179f1eac7334d6c17a6697b22de167e0b75f80
---
 .../SystemGesturesPointerEventListener.java   | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/services/core/java/com/android/server/wm/SystemGesturesPointerEventListener.java b/services/core/java/com/android/server/wm/SystemGesturesPointerEventListener.java
index 878b33fa55ef7..100735784fb1c 100644
--- a/services/core/java/com/android/server/wm/SystemGesturesPointerEventListener.java
+++ b/services/core/java/com/android/server/wm/SystemGesturesPointerEventListener.java
@@ -20,6 +20,8 @@ import static android.view.DisplayCutout.BOUNDS_POSITION_BOTTOM;
 import static android.view.DisplayCutout.BOUNDS_POSITION_LEFT;
 import static android.view.DisplayCutout.BOUNDS_POSITION_RIGHT;
 import static android.view.DisplayCutout.BOUNDS_POSITION_TOP;
+import static android.view.MotionEvent.AXIS_GESTURE_SWIPE_FINGER_COUNT;
+import static android.view.MotionEvent.CLASSIFICATION_MULTI_FINGER_SWIPE;
 
 import android.annotation.NonNull;
 import android.content.Context;
@@ -59,6 +61,12 @@ class SystemGesturesPointerEventListener implements PointerEventListener {
     private static final int SWIPE_FROM_RIGHT = 3;
     private static final int SWIPE_FROM_LEFT = 4;
 
+    private static final int TRACKPAD_SWIPE_NONE = 0;
+    private static final int TRACKPAD_SWIPE_FROM_TOP = 1;
+    private static final int TRACKPAD_SWIPE_FROM_BOTTOM = 2;
+    private static final int TRACKPAD_SWIPE_FROM_RIGHT = 3;
+    private static final int TRACKPAD_SWIPE_FROM_LEFT = 4;
+
     private final Context mContext;
     private final Handler mHandler;
     private int mDisplayCutoutTouchableRegionSize;
@@ -207,6 +215,25 @@ class SystemGesturesPointerEventListener implements PointerEventListener {
                 break;
             case MotionEvent.ACTION_MOVE:
                 if (mSwipeFireable) {
+                    int trackpadSwipe = detectTrackpadThreeFingerSwipe(event);
+                    mSwipeFireable = trackpadSwipe == TRACKPAD_SWIPE_NONE;
+                    if (!mSwipeFireable) {
+                        if (trackpadSwipe == TRACKPAD_SWIPE_FROM_TOP) {
+                            if (DEBUG) Slog.d(TAG, "Firing onSwipeFromTop from trackpad");
+                            mCallbacks.onSwipeFromTop();
+                        } else if (trackpadSwipe == TRACKPAD_SWIPE_FROM_BOTTOM) {
+                            if (DEBUG) Slog.d(TAG, "Firing onSwipeFromBottom from trackpad");
+                            mCallbacks.onSwipeFromBottom();
+                        } else if (trackpadSwipe == TRACKPAD_SWIPE_FROM_RIGHT) {
+                            if (DEBUG) Slog.d(TAG, "Firing onSwipeFromRight from trackpad");
+                            mCallbacks.onSwipeFromRight();
+                        } else if (trackpadSwipe == TRACKPAD_SWIPE_FROM_LEFT) {
+                            if (DEBUG) Slog.d(TAG, "Firing onSwipeFromLeft from trackpad");
+                            mCallbacks.onSwipeFromLeft();
+                        }
+                        break;
+                    }
+
                     final int swipe = detectSwipe(event);
                     mSwipeFireable = swipe == SWIPE_NONE;
                     if (swipe == SWIPE_FROM_TOP) {
@@ -300,6 +327,31 @@ class SystemGesturesPointerEventListener implements PointerEventListener {
         return mDownPointers - 1;
     }
 
+    private int detectTrackpadThreeFingerSwipe(MotionEvent move) {
+        if (!isTrackpadThreeFingerSwipe(move)) {
+            return TRACKPAD_SWIPE_NONE;
+        }
+
+        float dx = move.getX() - mDownX[0];
+        float dy = move.getY() - mDownY[0];
+        if (Math.abs(dx) < Math.abs(dy)) {
+            if (Math.abs(dy) > mSwipeDistanceThreshold) {
+                return dy > 0 ? TRACKPAD_SWIPE_FROM_TOP : TRACKPAD_SWIPE_FROM_BOTTOM;
+            }
+        } else {
+            if (Math.abs(dx) > mSwipeDistanceThreshold) {
+                return dx > 0 ? TRACKPAD_SWIPE_FROM_LEFT : TRACKPAD_SWIPE_FROM_RIGHT;
+            }
+        }
+
+        return TRACKPAD_SWIPE_NONE;
+    }
+
+    private static boolean isTrackpadThreeFingerSwipe(MotionEvent event) {
+        return event.getClassification() == CLASSIFICATION_MULTI_FINGER_SWIPE
+                && event.getAxisValue(AXIS_GESTURE_SWIPE_FINGER_COUNT) == 3;
+    }
+
     private int detectSwipe(MotionEvent move) {
         final int historySize = move.getHistorySize();
         final int pointerCount = move.getPointerCount();