Block touches when stylus is down
Since we haven't yet added simultaneous touch and stylus support, let's
improve the user experience by blocking all touch when the stylus is
down.
Bug: 210159205
Test: atest inputflinger_tests
Change-Id: Id6a6467d7feb7c7d91770ddbd63b92583832d504
diff --git a/services/inputflinger/Android.bp b/services/inputflinger/Android.bp
index ed9bfd2..41878e3 100644
--- a/services/inputflinger/Android.bp
+++ b/services/inputflinger/Android.bp
@@ -58,6 +58,7 @@
srcs: [
"InputClassifier.cpp",
"InputCommonConverter.cpp",
+ "PreferStylusOverTouchBlocker.cpp",
"UnwantedInteractionBlocker.cpp",
"InputManager.cpp",
],
diff --git a/services/inputflinger/PreferStylusOverTouchBlocker.cpp b/services/inputflinger/PreferStylusOverTouchBlocker.cpp
new file mode 100644
index 0000000..ad639b4
--- /dev/null
+++ b/services/inputflinger/PreferStylusOverTouchBlocker.cpp
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "PreferStylusOverTouchBlocker.h"
+
+#include <android-base/stringprintf.h>
+
+using android::base::StringPrintf;
+
+static const char* toString(bool value) {
+ return value ? "true" : "false";
+}
+
+namespace android {
+
+ftl::StaticVector<NotifyMotionArgs, 2> PreferStylusOverTouchBlocker::processMotion(
+ const NotifyMotionArgs& args) {
+ const bool isStylusEvent = isFromSource(args.source, AINPUT_SOURCE_STYLUS);
+ if (isStylusEvent) {
+ for (size_t i = 0; i < args.pointerCount; i++) {
+ // Make sure we are canceling stylus pointers
+ const int32_t toolType = args.pointerProperties[i].toolType;
+ LOG_ALWAYS_FATAL_IF(toolType != AMOTION_EVENT_TOOL_TYPE_STYLUS &&
+ toolType != AMOTION_EVENT_TOOL_TYPE_ERASER,
+ "The pointer %zu has toolType=%i, but the source is STYLUS. If "
+ "simultaneous touch and stylus is supported, "
+ "'PreferStylusOverTouchBlocker' should be disabled.",
+ i, toolType);
+ }
+ }
+ const bool isDown = args.action == AMOTION_EVENT_ACTION_DOWN;
+ const bool isUpOrCancel =
+ args.action == AMOTION_EVENT_ACTION_UP || args.action == AMOTION_EVENT_ACTION_CANCEL;
+ if (isStylusEvent) {
+ if (isDown) {
+ // Reject all touch while stylus is down
+ mIsStylusDown = true;
+ if (mIsTouchDown && !mCurrentTouchIsCanceled) {
+ // Cancel touch!
+ mCurrentTouchIsCanceled = true;
+ mLastTouchEvent.action = AMOTION_EVENT_ACTION_CANCEL;
+ mLastTouchEvent.flags |= AMOTION_EVENT_FLAG_CANCELED;
+ mLastTouchEvent.eventTime = systemTime(SYSTEM_TIME_MONOTONIC);
+ return {mLastTouchEvent, args};
+ }
+ }
+ if (isUpOrCancel) {
+ mIsStylusDown = false;
+ }
+ // Never drop stylus events
+ return {args};
+ }
+
+ const bool isTouchEvent =
+ isFromSource(args.source, AINPUT_SOURCE_TOUCHSCREEN) && !isStylusEvent;
+ if (isTouchEvent) {
+ if (mIsStylusDown) {
+ mCurrentTouchIsCanceled = true;
+ }
+ // If we already canceled the current gesture, then continue to drop events from it, even if
+ // the stylus has been lifted.
+ if (mCurrentTouchIsCanceled) {
+ if (isUpOrCancel) {
+ mCurrentTouchIsCanceled = false;
+ }
+ return {};
+ }
+
+ // Update state
+ mLastTouchEvent = args;
+ if (isDown) {
+ mIsTouchDown = true;
+ }
+ if (isUpOrCancel) {
+ mIsTouchDown = false;
+ mCurrentTouchIsCanceled = false;
+ }
+ return {args};
+ }
+
+ // Not a touch or stylus event
+ return {args};
+}
+
+std::string PreferStylusOverTouchBlocker::dump() {
+ std::string out;
+ out += StringPrintf("mIsTouchDown: %s\n", toString(mIsTouchDown));
+ out += StringPrintf("mIsStylusDown: %s\n", toString(mIsStylusDown));
+ out += StringPrintf("mLastTouchEvent: %s\n", mLastTouchEvent.dump().c_str());
+ out += StringPrintf("mCurrentTouchIsCanceled: %s\n", toString(mCurrentTouchIsCanceled));
+ return out;
+}
+
+} // namespace android
diff --git a/services/inputflinger/PreferStylusOverTouchBlocker.h b/services/inputflinger/PreferStylusOverTouchBlocker.h
new file mode 100644
index 0000000..3f56161
--- /dev/null
+++ b/services/inputflinger/PreferStylusOverTouchBlocker.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <ftl/static_vector.h>
+#include <optional>
+#include "InputListener.h"
+
+namespace android {
+
+/**
+ * When stylus is down, we ignore all touch.
+ * TODO(b/210159205): delete this when simultaneous stylus and touch is supported
+ */
+class PreferStylusOverTouchBlocker {
+public:
+ /**
+ * Process the provided event and emit up to 2 events in response.
+ * In the majority of cases, the returned result will just be the provided args (array with
+ * only 1 element), unmodified.
+ *
+ * If the gesture should be blocked, the returned result may be:
+ *
+ * a) An empty array, if the current event should just be ignored completely
+ * b) An array of 2 elements, containing an event with ACTION_CANCEL and the current event.
+ *
+ * bool is set to 'true'.
+ * NotifyMotionArgs potentially contains an event that should be used to cancel the existing
+ * gesture.
+ *
+ * If the event should not be blocked, bool contains 'false'.
+ */
+ ftl::StaticVector<NotifyMotionArgs, 2> processMotion(const NotifyMotionArgs& args);
+ std::string dump();
+
+private:
+ bool mIsTouchDown = false;
+ bool mIsStylusDown = false;
+ // Provide some default values for the stored MotionEvent to allow printint the event before
+ // any real event is received.
+ NotifyMotionArgs mLastTouchEvent{0 /*id*/,
+ 0 /*eventTime*/,
+ 0 /*readTime*/,
+ 0 /*deviceId*/,
+ AINPUT_SOURCE_TOUCHSCREEN,
+ 0 /*displayId*/,
+ 0 /*policyFlags*/,
+ 0 /*action*/,
+ 0 /*actionButton*/,
+ 0 /*flags*/,
+ 0 /*metaState*/,
+ 0 /*buttonState*/,
+ MotionClassification::NONE,
+ AMOTION_EVENT_EDGE_FLAG_NONE,
+ 0 /*pointerCount*/,
+ nullptr /*properties*/,
+ nullptr /*coords*/,
+ 0. /*xPrecision*/,
+ 0. /*yPrecision*/,
+ AMOTION_EVENT_INVALID_CURSOR_POSITION,
+ AMOTION_EVENT_INVALID_CURSOR_POSITION,
+ 0 /*downTime*/,
+ {}};
+ bool mCurrentTouchIsCanceled = false;
+};
+
+} // namespace android
\ No newline at end of file
diff --git a/services/inputflinger/UnwantedInteractionBlocker.cpp b/services/inputflinger/UnwantedInteractionBlocker.cpp
index 64dbb8c..f904bfd 100644
--- a/services/inputflinger/UnwantedInteractionBlocker.cpp
+++ b/services/inputflinger/UnwantedInteractionBlocker.cpp
@@ -44,7 +44,8 @@
}
static bool isFromTouchscreen(int32_t source) {
- return isFromSource(source, AINPUT_SOURCE_TOUCHSCREEN);
+ return isFromSource(source, AINPUT_SOURCE_TOUCHSCREEN) &&
+ !isFromSource(source, AINPUT_SOURCE_STYLUS);
}
static ::base::TimeTicks toChromeTimestamp(nsecs_t eventTime) {
@@ -367,6 +368,14 @@
}
void UnwantedInteractionBlocker::notifyMotion(const NotifyMotionArgs* args) {
+ ftl::StaticVector<NotifyMotionArgs, 2> processedArgs =
+ mPreferStylusOverTouchBlocker.processMotion(*args);
+ for (const NotifyMotionArgs& loopArgs : processedArgs) {
+ notifyMotionInner(&loopArgs);
+ }
+}
+
+void UnwantedInteractionBlocker::notifyMotionInner(const NotifyMotionArgs* args) {
auto it = mPalmRejectors.find(args->deviceId);
const bool sendToPalmRejector = it != mPalmRejectors.end() && isFromTouchscreen(args->source);
if (!sendToPalmRejector) {
@@ -440,6 +449,8 @@
void UnwantedInteractionBlocker::dump(std::string& dump) {
dump += "UnwantedInteractionBlocker:\n";
+ dump += " mPreferStylusOverTouchBlocker:\n";
+ dump += addPrefix(mPreferStylusOverTouchBlocker.dump(), " ");
dump += StringPrintf(" mEnablePalmRejection: %s\n", toString(mEnablePalmRejection));
dump += StringPrintf(" isPalmRejectionEnabled (flag value): %s\n",
toString(isPalmRejectionEnabled()));
diff --git a/services/inputflinger/UnwantedInteractionBlocker.h b/services/inputflinger/UnwantedInteractionBlocker.h
index 14068fd..9e41995 100644
--- a/services/inputflinger/UnwantedInteractionBlocker.h
+++ b/services/inputflinger/UnwantedInteractionBlocker.h
@@ -23,6 +23,8 @@
#include "ui/events/ozone/evdev/touch_filter/neural_stylus_palm_detection_filter_util.h"
#include "ui/events/ozone/evdev/touch_filter/palm_detection_filter.h"
+#include "PreferStylusOverTouchBlocker.h"
+
namespace android {
// --- Functions for manipulation of event streams
@@ -88,9 +90,13 @@
InputListenerInterface& mListener;
const bool mEnablePalmRejection;
+ // When stylus is down, ignore touch
+ PreferStylusOverTouchBlocker mPreferStylusOverTouchBlocker;
// Detect and reject unwanted palms on screen
// Use a separate palm rejector for every touch device.
std::map<int32_t /*deviceId*/, PalmRejector> mPalmRejectors;
+ // TODO(b/210159205): delete this when simultaneous stylus and touch is supported
+ void notifyMotionInner(const NotifyMotionArgs* args);
};
class SlotState {
diff --git a/services/inputflinger/tests/Android.bp b/services/inputflinger/tests/Android.bp
index 9d200bd..76a7c19 100644
--- a/services/inputflinger/tests/Android.bp
+++ b/services/inputflinger/tests/Android.bp
@@ -47,6 +47,7 @@
"InputReader_test.cpp",
"InputFlingerService_test.cpp",
"LatencyTracker_test.cpp",
+ "PreferStylusOverTouch_test.cpp",
"TestInputListener.cpp",
"UinputDevice.cpp",
"UnwantedInteractionBlocker_test.cpp",
diff --git a/services/inputflinger/tests/PreferStylusOverTouch_test.cpp b/services/inputflinger/tests/PreferStylusOverTouch_test.cpp
new file mode 100644
index 0000000..70f40aa
--- /dev/null
+++ b/services/inputflinger/tests/PreferStylusOverTouch_test.cpp
@@ -0,0 +1,250 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gtest/gtest.h>
+#include "../PreferStylusOverTouchBlocker.h"
+
+namespace android {
+
+constexpr int32_t TOUCH_DEVICE_ID = 3;
+constexpr int32_t STYLUS_DEVICE_ID = 4;
+
+constexpr int DOWN = AMOTION_EVENT_ACTION_DOWN;
+constexpr int MOVE = AMOTION_EVENT_ACTION_MOVE;
+constexpr int UP = AMOTION_EVENT_ACTION_UP;
+constexpr int CANCEL = AMOTION_EVENT_ACTION_CANCEL;
+constexpr int32_t TOUCHSCREEN = AINPUT_SOURCE_TOUCHSCREEN;
+constexpr int32_t STYLUS = AINPUT_SOURCE_STYLUS;
+
+struct PointerData {
+ float x;
+ float y;
+};
+
+static NotifyMotionArgs generateMotionArgs(nsecs_t downTime, nsecs_t eventTime, int32_t action,
+ const std::vector<PointerData>& points,
+ uint32_t source) {
+ size_t pointerCount = points.size();
+ if (action == DOWN || action == UP) {
+ EXPECT_EQ(1U, pointerCount) << "Actions DOWN and UP can only contain a single pointer";
+ }
+
+ PointerProperties pointerProperties[pointerCount];
+ PointerCoords pointerCoords[pointerCount];
+
+ const int32_t deviceId = isFromSource(source, TOUCHSCREEN) ? TOUCH_DEVICE_ID : STYLUS_DEVICE_ID;
+ const int32_t toolType = isFromSource(source, TOUCHSCREEN) ? AMOTION_EVENT_TOOL_TYPE_FINGER
+ : AMOTION_EVENT_TOOL_TYPE_STYLUS;
+ for (size_t i = 0; i < pointerCount; i++) {
+ pointerProperties[i].clear();
+ pointerProperties[i].id = i;
+ pointerProperties[i].toolType = toolType;
+
+ pointerCoords[i].clear();
+ pointerCoords[i].setAxisValue(AMOTION_EVENT_AXIS_X, points[i].x);
+ pointerCoords[i].setAxisValue(AMOTION_EVENT_AXIS_Y, points[i].y);
+ }
+
+ // Currently, can't have STYLUS source without it also being a TOUCH source. Update the source
+ // accordingly.
+ if (isFromSource(source, STYLUS)) {
+ source |= TOUCHSCREEN;
+ }
+
+ // Define a valid motion event.
+ NotifyMotionArgs args(/* id */ 0, eventTime, 0 /*readTime*/, deviceId, source, 0 /*displayId*/,
+ POLICY_FLAG_PASS_TO_USER, action, /* actionButton */ 0,
+ /* flags */ 0, AMETA_NONE, /* buttonState */ 0,
+ MotionClassification::NONE, AMOTION_EVENT_EDGE_FLAG_NONE, pointerCount,
+ pointerProperties, pointerCoords, /* xPrecision */ 0, /* yPrecision */ 0,
+ AMOTION_EVENT_INVALID_CURSOR_POSITION,
+ AMOTION_EVENT_INVALID_CURSOR_POSITION, downTime, /* videoFrames */ {});
+
+ return args;
+}
+
+class PreferStylusOverTouchTest : public testing::Test {
+protected:
+ void assertNotBlocked(const NotifyMotionArgs& args) {
+ ftl::StaticVector<NotifyMotionArgs, 2> processedArgs = mBlocker.processMotion(args);
+ ASSERT_EQ(1u, processedArgs.size());
+ ASSERT_EQ(args, processedArgs[0]);
+ }
+
+ void assertDropped(const NotifyMotionArgs& args) {
+ ftl::StaticVector<NotifyMotionArgs, 2> processedArgs = mBlocker.processMotion(args);
+ ASSERT_TRUE(processedArgs.empty());
+ }
+
+ void assertCanceled(const NotifyMotionArgs& args,
+ std::optional<NotifyMotionArgs> canceledArgs) {
+ ftl::StaticVector<NotifyMotionArgs, 2> processedArgs = mBlocker.processMotion(args);
+ ASSERT_EQ(2u, processedArgs.size());
+ NotifyMotionArgs& cancelEvent = processedArgs[0];
+ ASSERT_EQ(CANCEL, cancelEvent.action);
+ ASSERT_EQ(AMOTION_EVENT_FLAG_CANCELED, cancelEvent.flags & AMOTION_EVENT_FLAG_CANCELED);
+ ASSERT_TRUE(isFromSource(cancelEvent.source, TOUCHSCREEN));
+ ASSERT_FALSE(isFromSource(cancelEvent.source, STYLUS));
+
+ ASSERT_EQ(args, processedArgs[1]);
+ }
+
+private:
+ PreferStylusOverTouchBlocker mBlocker;
+};
+
+TEST_F(PreferStylusOverTouchTest, TouchGestureIsNotBlocked) {
+ NotifyMotionArgs args;
+
+ args = generateMotionArgs(0 /*downTime*/, 0 /*eventTime*/, DOWN, {{1, 2}}, TOUCHSCREEN);
+ assertNotBlocked(args);
+
+ args = generateMotionArgs(0 /*downTime*/, 1 /*eventTime*/, MOVE, {{1, 3}}, TOUCHSCREEN);
+ assertNotBlocked(args);
+
+ args = generateMotionArgs(0 /*downTime*/, 2 /*eventTime*/, UP, {{1, 3}}, TOUCHSCREEN);
+ assertNotBlocked(args);
+}
+
+TEST_F(PreferStylusOverTouchTest, StylusGestureIsNotBlocked) {
+ NotifyMotionArgs args;
+
+ args = generateMotionArgs(0 /*downTime*/, 0 /*eventTime*/, DOWN, {{1, 2}}, STYLUS);
+ assertNotBlocked(args);
+
+ args = generateMotionArgs(0 /*downTime*/, 1 /*eventTime*/, MOVE, {{1, 3}}, STYLUS);
+ assertNotBlocked(args);
+
+ args = generateMotionArgs(0 /*downTime*/, 2 /*eventTime*/, UP, {{1, 3}}, STYLUS);
+ assertNotBlocked(args);
+}
+
+/**
+ * Existing touch gesture should be canceled when stylus goes down. There should be an ACTION_CANCEL
+ * event generated.
+ */
+TEST_F(PreferStylusOverTouchTest, TouchIsCanceledWhenStylusGoesDown) {
+ NotifyMotionArgs args;
+
+ args = generateMotionArgs(0 /*downTime*/, 0 /*eventTime*/, DOWN, {{1, 2}}, TOUCHSCREEN);
+ assertNotBlocked(args);
+
+ args = generateMotionArgs(0 /*downTime*/, 1 /*eventTime*/, MOVE, {{1, 3}}, TOUCHSCREEN);
+ assertNotBlocked(args);
+
+ args = generateMotionArgs(3 /*downTime*/, 3 /*eventTime*/, DOWN, {{10, 30}}, STYLUS);
+ NotifyMotionArgs cancelArgs =
+ generateMotionArgs(0 /*downTime*/, 1 /*eventTime*/, CANCEL, {{1, 3}}, TOUCHSCREEN);
+ assertCanceled(args, cancelArgs);
+
+ // Both stylus and touch events continue. Stylus should be not blocked, and touch should be
+ // blocked
+ args = generateMotionArgs(3 /*downTime*/, 4 /*eventTime*/, MOVE, {{10, 31}}, STYLUS);
+ assertNotBlocked(args);
+
+ args = generateMotionArgs(0 /*downTime*/, 5 /*eventTime*/, MOVE, {{1, 4}}, TOUCHSCREEN);
+ assertDropped(args);
+}
+
+/**
+ * New touch events should be simply blocked (dropped) when stylus is down. No CANCEL event should
+ * be generated.
+ */
+TEST_F(PreferStylusOverTouchTest, NewTouchIsBlockedWhenStylusIsDown) {
+ NotifyMotionArgs args;
+ constexpr nsecs_t stylusDownTime = 0;
+ constexpr nsecs_t touchDownTime = 1;
+
+ args = generateMotionArgs(stylusDownTime, 0 /*eventTime*/, DOWN, {{10, 30}}, STYLUS);
+ assertNotBlocked(args);
+
+ args = generateMotionArgs(touchDownTime, 1 /*eventTime*/, DOWN, {{1, 2}}, TOUCHSCREEN);
+ assertDropped(args);
+
+ // Stylus should continue to work
+ args = generateMotionArgs(stylusDownTime, 2 /*eventTime*/, MOVE, {{10, 31}}, STYLUS);
+ assertNotBlocked(args);
+
+ // Touch should continue to be blocked
+ args = generateMotionArgs(touchDownTime, 1 /*eventTime*/, MOVE, {{1, 3}}, TOUCHSCREEN);
+ assertDropped(args);
+
+ args = generateMotionArgs(0 /*downTime*/, 5 /*eventTime*/, MOVE, {{1, 4}}, TOUCHSCREEN);
+ assertDropped(args);
+}
+
+/**
+ * New touch events should be simply blocked (dropped) when stylus is down. No CANCEL event should
+ * be generated.
+ */
+TEST_F(PreferStylusOverTouchTest, NewTouchWorksAfterStylusIsLifted) {
+ NotifyMotionArgs args;
+ constexpr nsecs_t stylusDownTime = 0;
+ constexpr nsecs_t touchDownTime = 4;
+
+ // Stylus goes down and up
+ args = generateMotionArgs(stylusDownTime, 0 /*eventTime*/, DOWN, {{10, 30}}, STYLUS);
+ assertNotBlocked(args);
+
+ args = generateMotionArgs(stylusDownTime, 2 /*eventTime*/, MOVE, {{10, 31}}, STYLUS);
+ assertNotBlocked(args);
+
+ args = generateMotionArgs(stylusDownTime, 3 /*eventTime*/, UP, {{10, 31}}, STYLUS);
+ assertNotBlocked(args);
+
+ // New touch goes down. It should not be blocked
+ args = generateMotionArgs(touchDownTime, touchDownTime, DOWN, {{1, 2}}, TOUCHSCREEN);
+ assertNotBlocked(args);
+
+ args = generateMotionArgs(touchDownTime, 5 /*eventTime*/, MOVE, {{1, 3}}, TOUCHSCREEN);
+ assertNotBlocked(args);
+
+ args = generateMotionArgs(touchDownTime, 6 /*eventTime*/, UP, {{1, 3}}, TOUCHSCREEN);
+ assertNotBlocked(args);
+}
+
+/**
+ * Once a touch gesture is canceled, it should continue to be canceled, even if the stylus has been
+ * lifted.
+ */
+TEST_F(PreferStylusOverTouchTest, AfterStylusIsLiftedCurrentTouchIsBlocked) {
+ NotifyMotionArgs args;
+ constexpr nsecs_t stylusDownTime = 0;
+ constexpr nsecs_t touchDownTime = 1;
+
+ assertNotBlocked(generateMotionArgs(stylusDownTime, 0 /*eventTime*/, DOWN, {{10, 30}}, STYLUS));
+
+ args = generateMotionArgs(touchDownTime, 1 /*eventTime*/, DOWN, {{1, 2}}, TOUCHSCREEN);
+ assertDropped(args);
+
+ // Lift the stylus
+ args = generateMotionArgs(stylusDownTime, 2 /*eventTime*/, UP, {{10, 30}}, STYLUS);
+ assertNotBlocked(args);
+
+ // Touch should continue to be blocked
+ args = generateMotionArgs(touchDownTime, 3 /*eventTime*/, MOVE, {{1, 3}}, TOUCHSCREEN);
+ assertDropped(args);
+
+ args = generateMotionArgs(touchDownTime, 4 /*eventTime*/, UP, {{1, 3}}, TOUCHSCREEN);
+ assertDropped(args);
+
+ // New touch should go through, though.
+ constexpr nsecs_t newTouchDownTime = 5;
+ args = generateMotionArgs(newTouchDownTime, 5 /*eventTime*/, DOWN, {{10, 20}}, TOUCHSCREEN);
+ assertNotBlocked(args);
+}
+
+} // namespace android