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* Copyright (C) 2019 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include "InjectionState.h"
#include "InputTarget.h"
#include <input/Input.h>
#include <input/InputApplication.h>
#include <stdint.h>
#include <utils/Timers.h>
#include <functional>
#include <string>
namespace android::inputdispatcher {
template <typename T>
struct Link {
T* next;
T* prev;
inline Link() : next(nullptr), prev(nullptr) {}
struct EventEntry : Link<EventEntry> {
uint32_t sequenceNum;
mutable int32_t refCount;
int32_t type;
nsecs_t eventTime;
uint32_t policyFlags;
InjectionState* injectionState;
bool dispatchInProgress; // initially false, set to true while dispatching
inline bool isInjected() const { return injectionState != nullptr; }
void release();
virtual void appendDescription(std::string& msg) const = 0;
EventEntry(uint32_t sequenceNum, int32_t type, nsecs_t eventTime, uint32_t policyFlags);
virtual ~EventEntry();
void releaseInjectionState();
struct ConfigurationChangedEntry : EventEntry {
explicit ConfigurationChangedEntry(uint32_t sequenceNum, nsecs_t eventTime);
virtual void appendDescription(std::string& msg) const;
virtual ~ConfigurationChangedEntry();
struct DeviceResetEntry : EventEntry {
int32_t deviceId;
DeviceResetEntry(uint32_t sequenceNum, nsecs_t eventTime, int32_t deviceId);
virtual void appendDescription(std::string& msg) const;
virtual ~DeviceResetEntry();
struct KeyEntry : EventEntry {
int32_t deviceId;
uint32_t source;
int32_t displayId;
int32_t action;
int32_t flags;
int32_t keyCode;
int32_t scanCode;
int32_t metaState;
int32_t repeatCount;
nsecs_t downTime;
bool syntheticRepeat; // set to true for synthetic key repeats
enum InterceptKeyResult {
InterceptKeyResult interceptKeyResult; // set based on the interception result
nsecs_t interceptKeyWakeupTime; // used with INTERCEPT_KEY_RESULT_TRY_AGAIN_LATER
KeyEntry(uint32_t sequenceNum, nsecs_t eventTime, int32_t deviceId, uint32_t source,
int32_t displayId, uint32_t policyFlags, int32_t action, int32_t flags,
int32_t keyCode, int32_t scanCode, int32_t metaState, int32_t repeatCount,
nsecs_t downTime);
virtual void appendDescription(std::string& msg) const;
void recycle();
virtual ~KeyEntry();
struct MotionEntry : EventEntry {
nsecs_t eventTime;
int32_t deviceId;
uint32_t source;
int32_t displayId;
int32_t action;
int32_t actionButton;
int32_t flags;
int32_t metaState;
int32_t buttonState;
MotionClassification classification;
int32_t edgeFlags;
float xPrecision;
float yPrecision;
nsecs_t downTime;
uint32_t pointerCount;
PointerProperties pointerProperties[MAX_POINTERS];
PointerCoords pointerCoords[MAX_POINTERS];
MotionEntry(uint32_t sequenceNum, nsecs_t eventTime, int32_t deviceId, uint32_t source,
int32_t displayId, uint32_t policyFlags, int32_t action, int32_t actionButton,
int32_t flags, int32_t metaState, int32_t buttonState,
MotionClassification classification, int32_t edgeFlags, float xPrecision,
float yPrecision, nsecs_t downTime, uint32_t pointerCount,
const PointerProperties* pointerProperties, const PointerCoords* pointerCoords,
float xOffset, float yOffset);
virtual void appendDescription(std::string& msg) const;
virtual ~MotionEntry();
// Tracks the progress of dispatching a particular event to a particular connection.
struct DispatchEntry : Link<DispatchEntry> {
const uint32_t seq; // unique sequence number, never 0
EventEntry* eventEntry; // the event to dispatch
int32_t targetFlags;
float xOffset;
float yOffset;
float globalScaleFactor;
float windowXScale = 1.0f;
float windowYScale = 1.0f;
nsecs_t deliveryTime; // time when the event was actually delivered
// Set to the resolved action and flags when the event is enqueued.
int32_t resolvedAction;
int32_t resolvedFlags;
DispatchEntry(EventEntry* eventEntry, int32_t targetFlags, float xOffset, float yOffset,
float globalScaleFactor, float windowXScale, float windowYScale);
inline bool hasForegroundTarget() const { return targetFlags & InputTarget::FLAG_FOREGROUND; }
inline bool isSplit() const { return targetFlags & InputTarget::FLAG_SPLIT; }
static volatile int32_t sNextSeqAtomic;
static uint32_t nextSeq();
class InputDispatcher;
// A command entry captures state and behavior for an action to be performed in the
// dispatch loop after the initial processing has taken place. It is essentially
// a kind of continuation used to postpone sensitive policy interactions to a point
// in the dispatch loop where it is safe to release the lock (generally after finishing
// the critical parts of the dispatch cycle).
// The special thing about commands is that they can voluntarily release and reacquire
// the dispatcher lock at will. Initially when the command starts running, the
// dispatcher lock is held. However, if the command needs to call into the policy to
// do some work, it can release the lock, do the work, then reacquire the lock again
// before returning.
// This mechanism is a bit clunky but it helps to preserve the invariant that the dispatch
// never calls into the policy while holding its lock.
// Commands are implicitly 'LockedInterruptible'.
struct CommandEntry;
typedef void (InputDispatcher::*Command)(CommandEntry* commandEntry);
class Connection;
struct CommandEntry : Link<CommandEntry> {
explicit CommandEntry(Command command);
Command command;
// parameters for the command (usage varies by command)
sp<Connection> connection;
nsecs_t eventTime;
KeyEntry* keyEntry;
sp<InputApplicationHandle> inputApplicationHandle;
std::string reason;
int32_t userActivityEventType;
uint32_t seq;
bool handled;
sp<InputChannel> inputChannel;
sp<IBinder> oldToken;
sp<IBinder> newToken;
} // namespace android::inputdispatcher