Cancel touch events when a low-level touch gesture occurs.

When the touch firmware or driver sends a key event that is triggered
by a low-level gesture such as a palm slap.  For this to work, the
touch device's .kl file must specify the "GESTURE" flag for each
key that is produced by a gesture.

Note that the "VIRTUAL" flag should also be specified for any such
keys for which we would like to generate haptic feedback.

eg. key 142   SLEEP   VIRTUAL GESTURE

Bug: 19264992
Change-Id: Ief494ec7e3ca66d2358a1001fdfae4f263ee1cd1

1 files changed, 18 insertions, 0 deletions

diff --git a/services/inputflinger/InputReader.cpp b/services/inputflinger/InputReader.cpp
index 8634e42..ccf8ced 100644
--- a/services/inputflinger/InputReader.cpp
+++ b/services/inputflinger/InputReader.cpp
@@ -1078,6 +1078,14 @@ void InputDevice::cancelVibrate(int32_t token) {
     }
 }
 
+void InputDevice::cancelTouch(nsecs_t when) {
+    size_t numMappers = mMappers.size();
+    for (size_t i = 0; i < numMappers; i++) {
+        InputMapper* mapper = mMappers[i];
+        mapper->cancelTouch(when);
+    }
+}
+
 int32_t InputDevice::getMetaState() {
     int32_t result = 0;
     size_t numMappers = mMappers.size();
@@ -1786,6 +1794,9 @@ void InputMapper::vibrate(const nsecs_t* pattern, size_t patternSize, ssize_t re
 void InputMapper::cancelVibrate(int32_t token) {
 }
 
+void InputMapper::cancelTouch(nsecs_t when) {
+}
+
 int32_t InputMapper::getMetaState() {
     return 0;
 }
@@ -2134,6 +2145,9 @@ void KeyboardInputMapper::processKey(nsecs_t when, bool down, int32_t keyCode,
                             getDevice(), keyCode, scanCode)) {
                 return;
             }
+            if (policyFlags & POLICY_FLAG_GESTURE) {
+                mDevice->cancelTouch(when);
+            }
 
             mKeyDowns.push();
             KeyDown& keyDown = mKeyDowns.editTop();
@@ -5717,6 +5731,10 @@ void TouchInputMapper::fadePointer() {
     }
 }
 
+void TouchInputMapper::cancelTouch(nsecs_t when) {
+    abortPointerUsage(when, 0 /*policyFlags*/);
+}
+
 bool TouchInputMapper::isPointInsideSurface(int32_t x, int32_t y) {
     return x >= mRawPointerAxes.x.minValue && x <= mRawPointerAxes.x.maxValue
             && y >= mRawPointerAxes.y.minValue && y <= mRawPointerAxes.y.maxValue;