Block touches when stylus is down (a3c8e519) · Commits · e / os / android_frameworks_native

services/inputflinger/Android.bp

+1 −0

Original line number	Diff line number	Diff line
		@@ -58,6 +58,7 @@ filegroup {
		srcs: [
		"InputClassifier.cpp",
		"InputCommonConverter.cpp",
		"PreferStylusOverTouchBlocker.cpp",
		"UnwantedInteractionBlocker.cpp",
		"InputManager.cpp",
		],

services/inputflinger/PreferStylusOverTouchBlocker.cpp

0 → 100644

+107 −0

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		/*
		* 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

services/inputflinger/PreferStylusOverTouchBlocker.h

0 → 100644

+81 −0

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		/*
		* 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

services/inputflinger/UnwantedInteractionBlocker.cpp

+12 −1

Original line number	Diff line number	Diff line
		@@ -44,7 +44,8 @@ static std::string toLower(std::string s) {
		}

		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::notifyKey(const NotifyKeyArgs* args) {
		}

		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::notifyInputDevicesChanged(

		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()));

services/inputflinger/UnwantedInteractionBlocker.h

+6 −0

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		@@ -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 @@ private:
		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 {