Filter virtual keys after touches.
Adds a new virtualKeyQuietTimeMillis configuration resource that sets
the duration for which virtual keys will be dropped after recent touches
on screen. The default value is 0; it is intended to be overridden
per device using a resource overlay.
This change is designed to help in two cases:
1. Swipes from touchscreen into virtual key area.
2. Accidental taps in virtual key area while using on-screen keyboard.
Bug: 3089163
Change-Id: Ib912d4f8a4df9966a39cd537d3ec7c24afab7225
diff --git a/services/input/InputReader.cpp b/services/input/InputReader.cpp
index 6b66791..8e9a5a4 100644
--- a/services/input/InputReader.cpp
+++ b/services/input/InputReader.cpp
@@ -121,7 +121,7 @@
const sp<InputReaderPolicyInterface>& policy,
const sp<InputDispatcherInterface>& dispatcher) :
mEventHub(eventHub), mPolicy(policy), mDispatcher(dispatcher),
- mGlobalMetaState(0) {
+ mGlobalMetaState(0), mDisableVirtualKeysTimeout(-1) {
configureExcludedDevices();
updateGlobalMetaState();
updateInputConfiguration();
@@ -373,6 +373,24 @@
} // release state lock
}
+void InputReader::disableVirtualKeysUntil(nsecs_t time) {
+ mDisableVirtualKeysTimeout = time;
+}
+
+bool InputReader::shouldDropVirtualKey(nsecs_t now,
+ InputDevice* device, int32_t keyCode, int32_t scanCode) {
+ if (now < mDisableVirtualKeysTimeout) {
+ LOGI("Dropping virtual key from device %s because virtual keys are "
+ "temporarily disabled for the next %0.3fms. keyCode=%d, scanCode=%d",
+ device->getName().string(),
+ (mDisableVirtualKeysTimeout - now) * 0.000001,
+ keyCode, scanCode);
+ return true;
+ } else {
+ return false;
+ }
+}
+
void InputReader::getInputConfiguration(InputConfiguration* outConfiguration) {
{ // acquire state lock
AutoMutex _l(mStateLock);
@@ -889,6 +907,12 @@
keyCode = mLocked.keyDowns.itemAt(keyDownIndex).keyCode;
} else {
// key down
+ if ((policyFlags & POLICY_FLAG_VIRTUAL)
+ && mContext->shouldDropVirtualKey(when,
+ getDevice(), keyCode, scanCode)) {
+ return;
+ }
+
mLocked.keyDowns.push();
KeyDown& keyDown = mLocked.keyDowns.editTop();
keyDown.keyCode = keyCode;
@@ -1428,6 +1452,7 @@
mParameters.useBadTouchFilter = getPolicy()->filterTouchEvents();
mParameters.useAveragingTouchFilter = getPolicy()->filterTouchEvents();
mParameters.useJumpyTouchFilter = getPolicy()->filterJumpyTouchEvents();
+ mParameters.virtualKeyQuietTime = getPolicy()->getVirtualKeyQuietTime();
String8 deviceTypeString;
mParameters.deviceType = Parameters::DEVICE_TYPE_TOUCH_SCREEN;
@@ -2219,6 +2244,7 @@
TouchResult touchResult = consumeOffScreenTouches(when, policyFlags);
if (touchResult == DISPATCH_TOUCH) {
+ detectGestures(when);
dispatchTouches(when, policyFlags);
}
@@ -2304,6 +2330,11 @@
if (mCurrentTouch.pointerCount == 1) {
const VirtualKey* virtualKey = findVirtualKeyHitLocked(x, y);
if (virtualKey) {
+ if (mContext->shouldDropVirtualKey(when, getDevice(),
+ virtualKey->keyCode, virtualKey->scanCode)) {
+ return DROP_STROKE;
+ }
+
mLocked.currentVirtualKey.down = true;
mLocked.currentVirtualKey.downTime = when;
mLocked.currentVirtualKey.keyCode = virtualKey->keyCode;
@@ -2341,6 +2372,26 @@
return touchResult;
}
+void TouchInputMapper::detectGestures(nsecs_t when) {
+ // Disable all virtual key touches that happen within a short time interval of the
+ // most recent touch. The idea is to filter out stray virtual key presses when
+ // interacting with the touch screen.
+ //
+ // Problems we're trying to solve:
+ //
+ // 1. While scrolling a list or dragging the window shade, the user swipes down into a
+ // virtual key area that is implemented by a separate touch panel and accidentally
+ // triggers a virtual key.
+ //
+ // 2. While typing in the on screen keyboard, the user taps slightly outside the screen
+ // area and accidentally triggers a virtual key. This often happens when virtual keys
+ // are layed out below the screen near to where the on screen keyboard's space bar
+ // is displayed.
+ if (mParameters.virtualKeyQuietTime > 0 && mCurrentTouch.pointerCount != 0) {
+ mContext->disableVirtualKeysUntil(when + mParameters.virtualKeyQuietTime);
+ }
+}
+
void TouchInputMapper::dispatchTouches(nsecs_t when, uint32_t policyFlags) {
uint32_t currentPointerCount = mCurrentTouch.pointerCount;
uint32_t lastPointerCount = mLastTouch.pointerCount;
diff --git a/services/input/InputReader.h b/services/input/InputReader.h
index 8b2d40a..7619682 100644
--- a/services/input/InputReader.h
+++ b/services/input/InputReader.h
@@ -78,6 +78,12 @@
*/
virtual bool filterJumpyTouchEvents() = 0;
+ /* Gets the amount of time to disable virtual keys after the screen is touched
+ * in order to filter out accidental virtual key presses due to swiping gestures
+ * or taps near the edge of the display. May be 0 to disable the feature.
+ */
+ virtual nsecs_t getVirtualKeyQuietTime() = 0;
+
/* Gets the excluded device names for the platform. */
virtual void getExcludedDeviceNames(Vector<String8>& outExcludedDeviceNames) = 0;
@@ -147,6 +153,10 @@
virtual void updateGlobalMetaState() = 0;
virtual int32_t getGlobalMetaState() = 0;
+ virtual void disableVirtualKeysUntil(nsecs_t time) = 0;
+ virtual bool shouldDropVirtualKey(nsecs_t now,
+ InputDevice* device, int32_t keyCode, int32_t scanCode) = 0;
+
virtual InputReaderPolicyInterface* getPolicy() = 0;
virtual InputDispatcherInterface* getDispatcher() = 0;
virtual EventHubInterface* getEventHub() = 0;
@@ -234,6 +244,11 @@
InputConfiguration mInputConfiguration;
void updateInputConfiguration();
+ nsecs_t mDisableVirtualKeysTimeout;
+ virtual void disableVirtualKeysUntil(nsecs_t time);
+ virtual bool shouldDropVirtualKey(nsecs_t now,
+ InputDevice* device, int32_t keyCode, int32_t scanCode);
+
// state queries
typedef int32_t (InputDevice::*GetStateFunc)(uint32_t sourceMask, int32_t code);
int32_t getState(int32_t deviceId, uint32_t sourceMask, int32_t code,
@@ -603,6 +618,7 @@
bool useBadTouchFilter;
bool useJumpyTouchFilter;
bool useAveragingTouchFilter;
+ nsecs_t virtualKeyQuietTime;
} mParameters;
// Immutable calibration parameters in parsed form.
@@ -839,6 +855,7 @@
void dispatchTouch(nsecs_t when, uint32_t policyFlags, TouchData* touch,
BitSet32 idBits, uint32_t changedId, uint32_t pointerCount,
int32_t motionEventAction);
+ void detectGestures(nsecs_t when);
bool isPointInsideSurfaceLocked(int32_t x, int32_t y);
const VirtualKey* findVirtualKeyHitLocked(int32_t x, int32_t y);
diff --git a/services/input/tests/InputReader_test.cpp b/services/input/tests/InputReader_test.cpp
index 8ec6f53..775747c 100644
--- a/services/input/tests/InputReader_test.cpp
+++ b/services/input/tests/InputReader_test.cpp
@@ -127,6 +127,10 @@
mFilterJumpyTouchEvents = enabled;
}
+ virtual nsecs_t getVirtualKeyQuietTime() {
+ return 0;
+ }
+
void addExcludedDeviceName(const String8& deviceName) {
mExcludedDeviceNames.push(deviceName);
}
@@ -722,6 +726,14 @@
virtual InputDispatcherInterface* getDispatcher() {
return mDispatcher.get();
}
+
+ virtual void disableVirtualKeysUntil(nsecs_t time) {
+ }
+
+ virtual bool shouldDropVirtualKey(nsecs_t now,
+ InputDevice* device, int32_t keyCode, int32_t scanCode) {
+ return false;
+ }
};