| /* |
| * Copyright (C) 2010 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. |
| */ |
| |
| #ifndef _UI_INPUT_DISPATCHER_H |
| #define _UI_INPUT_DISPATCHER_H |
| |
| #include <input/Input.h> |
| #include <input/InputTransport.h> |
| #include <utils/KeyedVector.h> |
| #include <utils/Vector.h> |
| #include <utils/threads.h> |
| #include <utils/Timers.h> |
| #include <utils/RefBase.h> |
| #include <utils/String8.h> |
| #include <utils/Looper.h> |
| #include <utils/BitSet.h> |
| #include <cutils/atomic.h> |
| |
| #include <stddef.h> |
| #include <unistd.h> |
| #include <limits.h> |
| |
| #include "InputWindow.h" |
| #include "InputApplication.h" |
| #include "InputListener.h" |
| |
| |
| namespace android { |
| |
| /* |
| * Constants used to report the outcome of input event injection. |
| */ |
| enum { |
| /* (INTERNAL USE ONLY) Specifies that injection is pending and its outcome is unknown. */ |
| INPUT_EVENT_INJECTION_PENDING = -1, |
| |
| /* Injection succeeded. */ |
| INPUT_EVENT_INJECTION_SUCCEEDED = 0, |
| |
| /* Injection failed because the injector did not have permission to inject |
| * into the application with input focus. */ |
| INPUT_EVENT_INJECTION_PERMISSION_DENIED = 1, |
| |
| /* Injection failed because there were no available input targets. */ |
| INPUT_EVENT_INJECTION_FAILED = 2, |
| |
| /* Injection failed due to a timeout. */ |
| INPUT_EVENT_INJECTION_TIMED_OUT = 3 |
| }; |
| |
| /* |
| * Constants used to determine the input event injection synchronization mode. |
| */ |
| enum { |
| /* Injection is asynchronous and is assumed always to be successful. */ |
| INPUT_EVENT_INJECTION_SYNC_NONE = 0, |
| |
| /* Waits for previous events to be dispatched so that the input dispatcher can determine |
| * whether input event injection willbe permitted based on the current input focus. |
| * Does not wait for the input event to finish processing. */ |
| INPUT_EVENT_INJECTION_SYNC_WAIT_FOR_RESULT = 1, |
| |
| /* Waits for the input event to be completely processed. */ |
| INPUT_EVENT_INJECTION_SYNC_WAIT_FOR_FINISHED = 2, |
| }; |
| |
| |
| /* |
| * An input target specifies how an input event is to be dispatched to a particular window |
| * including the window's input channel, control flags, a timeout, and an X / Y offset to |
| * be added to input event coordinates to compensate for the absolute position of the |
| * window area. |
| */ |
| struct InputTarget { |
| enum { |
| /* This flag indicates that the event is being delivered to a foreground application. */ |
| FLAG_FOREGROUND = 1 << 0, |
| |
| /* This flag indicates that the target of a MotionEvent is partly or wholly |
| * obscured by another visible window above it. The motion event should be |
| * delivered with flag AMOTION_EVENT_FLAG_WINDOW_IS_OBSCURED. */ |
| FLAG_WINDOW_IS_OBSCURED = 1 << 1, |
| |
| /* This flag indicates that a motion event is being split across multiple windows. */ |
| FLAG_SPLIT = 1 << 2, |
| |
| /* This flag indicates that the pointer coordinates dispatched to the application |
| * will be zeroed out to avoid revealing information to an application. This is |
| * used in conjunction with FLAG_DISPATCH_AS_OUTSIDE to prevent apps not sharing |
| * the same UID from watching all touches. */ |
| FLAG_ZERO_COORDS = 1 << 3, |
| |
| /* This flag indicates that the event should be sent as is. |
| * Should always be set unless the event is to be transmuted. */ |
| FLAG_DISPATCH_AS_IS = 1 << 8, |
| |
| /* This flag indicates that a MotionEvent with AMOTION_EVENT_ACTION_DOWN falls outside |
| * of the area of this target and so should instead be delivered as an |
| * AMOTION_EVENT_ACTION_OUTSIDE to this target. */ |
| FLAG_DISPATCH_AS_OUTSIDE = 1 << 9, |
| |
| /* This flag indicates that a hover sequence is starting in the given window. |
| * The event is transmuted into ACTION_HOVER_ENTER. */ |
| FLAG_DISPATCH_AS_HOVER_ENTER = 1 << 10, |
| |
| /* This flag indicates that a hover event happened outside of a window which handled |
| * previous hover events, signifying the end of the current hover sequence for that |
| * window. |
| * The event is transmuted into ACTION_HOVER_ENTER. */ |
| FLAG_DISPATCH_AS_HOVER_EXIT = 1 << 11, |
| |
| /* This flag indicates that the event should be canceled. |
| * It is used to transmute ACTION_MOVE into ACTION_CANCEL when a touch slips |
| * outside of a window. */ |
| FLAG_DISPATCH_AS_SLIPPERY_EXIT = 1 << 12, |
| |
| /* This flag indicates that the event should be dispatched as an initial down. |
| * It is used to transmute ACTION_MOVE into ACTION_DOWN when a touch slips |
| * into a new window. */ |
| FLAG_DISPATCH_AS_SLIPPERY_ENTER = 1 << 13, |
| |
| /* Mask for all dispatch modes. */ |
| FLAG_DISPATCH_MASK = FLAG_DISPATCH_AS_IS |
| | FLAG_DISPATCH_AS_OUTSIDE |
| | FLAG_DISPATCH_AS_HOVER_ENTER |
| | FLAG_DISPATCH_AS_HOVER_EXIT |
| | FLAG_DISPATCH_AS_SLIPPERY_EXIT |
| | FLAG_DISPATCH_AS_SLIPPERY_ENTER, |
| }; |
| |
| // The input channel to be targeted. |
| sp<InputChannel> inputChannel; |
| |
| // Flags for the input target. |
| int32_t flags; |
| |
| // The x and y offset to add to a MotionEvent as it is delivered. |
| // (ignored for KeyEvents) |
| float xOffset, yOffset; |
| |
| // Scaling factor to apply to MotionEvent as it is delivered. |
| // (ignored for KeyEvents) |
| float scaleFactor; |
| |
| // The subset of pointer ids to include in motion events dispatched to this input target |
| // if FLAG_SPLIT is set. |
| BitSet32 pointerIds; |
| }; |
| |
| |
| /* |
| * Input dispatcher configuration. |
| * |
| * Specifies various options that modify the behavior of the input dispatcher. |
| * The values provided here are merely defaults. The actual values will come from ViewConfiguration |
| * and are passed into the dispatcher during initialization. |
| */ |
| struct InputDispatcherConfiguration { |
| // The key repeat initial timeout. |
| nsecs_t keyRepeatTimeout; |
| |
| // The key repeat inter-key delay. |
| nsecs_t keyRepeatDelay; |
| |
| InputDispatcherConfiguration() : |
| keyRepeatTimeout(500 * 1000000LL), |
| keyRepeatDelay(50 * 1000000LL) { } |
| }; |
| |
| |
| /* |
| * Input dispatcher policy interface. |
| * |
| * The input reader policy is used by the input reader to interact with the Window Manager |
| * and other system components. |
| * |
| * The actual implementation is partially supported by callbacks into the DVM |
| * via JNI. This interface is also mocked in the unit tests. |
| */ |
| class InputDispatcherPolicyInterface : public virtual RefBase { |
| protected: |
| InputDispatcherPolicyInterface() { } |
| virtual ~InputDispatcherPolicyInterface() { } |
| |
| public: |
| /* Notifies the system that a configuration change has occurred. */ |
| virtual void notifyConfigurationChanged(nsecs_t when) = 0; |
| |
| /* Notifies the system that an application is not responding. |
| * Returns a new timeout to continue waiting, or 0 to abort dispatch. */ |
| virtual nsecs_t notifyANR(const sp<InputApplicationHandle>& inputApplicationHandle, |
| const sp<InputWindowHandle>& inputWindowHandle, |
| const String8& reason) = 0; |
| |
| /* Notifies the system that an input channel is unrecoverably broken. */ |
| virtual void notifyInputChannelBroken(const sp<InputWindowHandle>& inputWindowHandle) = 0; |
| |
| /* Gets the input dispatcher configuration. */ |
| virtual void getDispatcherConfiguration(InputDispatcherConfiguration* outConfig) = 0; |
| |
| /* Returns true if automatic key repeating is enabled. */ |
| virtual bool isKeyRepeatEnabled() = 0; |
| |
| /* Filters an input event. |
| * Return true to dispatch the event unmodified, false to consume the event. |
| * A filter can also transform and inject events later by passing POLICY_FLAG_FILTERED |
| * to injectInputEvent. |
| */ |
| virtual bool filterInputEvent(const InputEvent* inputEvent, uint32_t policyFlags) = 0; |
| |
| /* Intercepts a key event immediately before queueing it. |
| * The policy can use this method as an opportunity to perform power management functions |
| * and early event preprocessing such as updating policy flags. |
| * |
| * This method is expected to set the POLICY_FLAG_PASS_TO_USER policy flag if the event |
| * should be dispatched to applications. |
| */ |
| virtual void interceptKeyBeforeQueueing(const KeyEvent* keyEvent, uint32_t& policyFlags) = 0; |
| |
| /* Intercepts a touch, trackball or other motion event before queueing it. |
| * The policy can use this method as an opportunity to perform power management functions |
| * and early event preprocessing such as updating policy flags. |
| * |
| * This method is expected to set the POLICY_FLAG_PASS_TO_USER policy flag if the event |
| * should be dispatched to applications. |
| */ |
| virtual void interceptMotionBeforeQueueing(nsecs_t when, uint32_t& policyFlags) = 0; |
| |
| /* Allows the policy a chance to intercept a key before dispatching. */ |
| virtual nsecs_t interceptKeyBeforeDispatching(const sp<InputWindowHandle>& inputWindowHandle, |
| const KeyEvent* keyEvent, uint32_t policyFlags) = 0; |
| |
| /* Allows the policy a chance to perform default processing for an unhandled key. |
| * Returns an alternate keycode to redispatch as a fallback, or 0 to give up. */ |
| virtual bool dispatchUnhandledKey(const sp<InputWindowHandle>& inputWindowHandle, |
| const KeyEvent* keyEvent, uint32_t policyFlags, KeyEvent* outFallbackKeyEvent) = 0; |
| |
| /* Notifies the policy about switch events. |
| */ |
| virtual void notifySwitch(nsecs_t when, |
| uint32_t switchValues, uint32_t switchMask, uint32_t policyFlags) = 0; |
| |
| /* Poke user activity for an event dispatched to a window. */ |
| virtual void pokeUserActivity(nsecs_t eventTime, int32_t eventType) = 0; |
| |
| /* Checks whether a given application pid/uid has permission to inject input events |
| * into other applications. |
| * |
| * This method is special in that its implementation promises to be non-reentrant and |
| * is safe to call while holding other locks. (Most other methods make no such guarantees!) |
| */ |
| virtual bool checkInjectEventsPermissionNonReentrant( |
| int32_t injectorPid, int32_t injectorUid) = 0; |
| }; |
| |
| |
| /* Notifies the system about input events generated by the input reader. |
| * The dispatcher is expected to be mostly asynchronous. */ |
| class InputDispatcherInterface : public virtual RefBase, public InputListenerInterface { |
| protected: |
| InputDispatcherInterface() { } |
| virtual ~InputDispatcherInterface() { } |
| |
| public: |
| /* Dumps the state of the input dispatcher. |
| * |
| * This method may be called on any thread (usually by the input manager). */ |
| virtual void dump(String8& dump) = 0; |
| |
| /* Called by the heatbeat to ensures that the dispatcher has not deadlocked. */ |
| virtual void monitor() = 0; |
| |
| /* Runs a single iteration of the dispatch loop. |
| * Nominally processes one queued event, a timeout, or a response from an input consumer. |
| * |
| * This method should only be called on the input dispatcher thread. |
| */ |
| virtual void dispatchOnce() = 0; |
| |
| /* Injects an input event and optionally waits for sync. |
| * The synchronization mode determines whether the method blocks while waiting for |
| * input injection to proceed. |
| * Returns one of the INPUT_EVENT_INJECTION_XXX constants. |
| * |
| * This method may be called on any thread (usually by the input manager). |
| */ |
| virtual int32_t injectInputEvent(const InputEvent* event, int32_t displayId, |
| int32_t injectorPid, int32_t injectorUid, int32_t syncMode, int32_t timeoutMillis, |
| uint32_t policyFlags) = 0; |
| |
| /* Sets the list of input windows. |
| * |
| * This method may be called on any thread (usually by the input manager). |
| */ |
| virtual void setInputWindows(const Vector<sp<InputWindowHandle> >& inputWindowHandles) = 0; |
| |
| /* Sets the focused application. |
| * |
| * This method may be called on any thread (usually by the input manager). |
| */ |
| virtual void setFocusedApplication( |
| const sp<InputApplicationHandle>& inputApplicationHandle) = 0; |
| |
| /* Sets the input dispatching mode. |
| * |
| * This method may be called on any thread (usually by the input manager). |
| */ |
| virtual void setInputDispatchMode(bool enabled, bool frozen) = 0; |
| |
| /* Sets whether input event filtering is enabled. |
| * When enabled, incoming input events are sent to the policy's filterInputEvent |
| * method instead of being dispatched. The filter is expected to use |
| * injectInputEvent to inject the events it would like to have dispatched. |
| * It should include POLICY_FLAG_FILTERED in the policy flags during injection. |
| */ |
| virtual void setInputFilterEnabled(bool enabled) = 0; |
| |
| /* Transfers touch focus from the window associated with one channel to the |
| * window associated with the other channel. |
| * |
| * Returns true on success. False if the window did not actually have touch focus. |
| */ |
| virtual bool transferTouchFocus(const sp<InputChannel>& fromChannel, |
| const sp<InputChannel>& toChannel) = 0; |
| |
| /* Registers or unregister input channels that may be used as targets for input events. |
| * If monitor is true, the channel will receive a copy of all input events. |
| * |
| * These methods may be called on any thread (usually by the input manager). |
| */ |
| virtual status_t registerInputChannel(const sp<InputChannel>& inputChannel, |
| const sp<InputWindowHandle>& inputWindowHandle, bool monitor) = 0; |
| virtual status_t unregisterInputChannel(const sp<InputChannel>& inputChannel) = 0; |
| }; |
| |
| /* Dispatches events to input targets. Some functions of the input dispatcher, such as |
| * identifying input targets, are controlled by a separate policy object. |
| * |
| * IMPORTANT INVARIANT: |
| * Because the policy can potentially block or cause re-entrance into the input dispatcher, |
| * the input dispatcher never calls into the policy while holding its internal locks. |
| * The implementation is also carefully designed to recover from scenarios such as an |
| * input channel becoming unregistered while identifying input targets or processing timeouts. |
| * |
| * Methods marked 'Locked' must be called with the lock acquired. |
| * |
| * Methods marked 'LockedInterruptible' must be called with the lock acquired but |
| * may during the course of their execution release the lock, call into the policy, and |
| * then reacquire the lock. The caller is responsible for recovering gracefully. |
| * |
| * A 'LockedInterruptible' method may called a 'Locked' method, but NOT vice-versa. |
| */ |
| class InputDispatcher : public InputDispatcherInterface { |
| protected: |
| virtual ~InputDispatcher(); |
| |
| public: |
| explicit InputDispatcher(const sp<InputDispatcherPolicyInterface>& policy); |
| |
| virtual void dump(String8& dump); |
| virtual void monitor(); |
| |
| virtual void dispatchOnce(); |
| |
| virtual void notifyConfigurationChanged(const NotifyConfigurationChangedArgs* args); |
| virtual void notifyKey(const NotifyKeyArgs* args); |
| virtual void notifyMotion(const NotifyMotionArgs* args); |
| virtual void notifySwitch(const NotifySwitchArgs* args); |
| virtual void notifyDeviceReset(const NotifyDeviceResetArgs* args); |
| |
| virtual int32_t injectInputEvent(const InputEvent* event, int32_t displayId, |
| int32_t injectorPid, int32_t injectorUid, int32_t syncMode, int32_t timeoutMillis, |
| uint32_t policyFlags); |
| |
| virtual void setInputWindows(const Vector<sp<InputWindowHandle> >& inputWindowHandles); |
| virtual void setFocusedApplication(const sp<InputApplicationHandle>& inputApplicationHandle); |
| virtual void setInputDispatchMode(bool enabled, bool frozen); |
| virtual void setInputFilterEnabled(bool enabled); |
| |
| virtual bool transferTouchFocus(const sp<InputChannel>& fromChannel, |
| const sp<InputChannel>& toChannel); |
| |
| virtual status_t registerInputChannel(const sp<InputChannel>& inputChannel, |
| const sp<InputWindowHandle>& inputWindowHandle, bool monitor); |
| virtual status_t unregisterInputChannel(const sp<InputChannel>& inputChannel); |
| |
| private: |
| template <typename T> |
| struct Link { |
| T* next; |
| T* prev; |
| |
| protected: |
| inline Link() : next(NULL), prev(NULL) { } |
| }; |
| |
| struct InjectionState { |
| mutable int32_t refCount; |
| |
| int32_t injectorPid; |
| int32_t injectorUid; |
| int32_t injectionResult; // initially INPUT_EVENT_INJECTION_PENDING |
| bool injectionIsAsync; // set to true if injection is not waiting for the result |
| int32_t pendingForegroundDispatches; // the number of foreground dispatches in progress |
| |
| InjectionState(int32_t injectorPid, int32_t injectorUid); |
| void release(); |
| |
| private: |
| ~InjectionState(); |
| }; |
| |
| struct EventEntry : Link<EventEntry> { |
| enum { |
| TYPE_CONFIGURATION_CHANGED, |
| TYPE_DEVICE_RESET, |
| TYPE_KEY, |
| TYPE_MOTION |
| }; |
| |
| 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 != NULL; } |
| |
| void release(); |
| |
| virtual void appendDescription(String8& msg) const = 0; |
| |
| protected: |
| EventEntry(int32_t type, nsecs_t eventTime, uint32_t policyFlags); |
| virtual ~EventEntry(); |
| void releaseInjectionState(); |
| }; |
| |
| struct ConfigurationChangedEntry : EventEntry { |
| ConfigurationChangedEntry(nsecs_t eventTime); |
| virtual void appendDescription(String8& msg) const; |
| |
| protected: |
| virtual ~ConfigurationChangedEntry(); |
| }; |
| |
| struct DeviceResetEntry : EventEntry { |
| int32_t deviceId; |
| |
| DeviceResetEntry(nsecs_t eventTime, int32_t deviceId); |
| virtual void appendDescription(String8& msg) const; |
| |
| protected: |
| virtual ~DeviceResetEntry(); |
| }; |
| |
| struct KeyEntry : EventEntry { |
| int32_t deviceId; |
| uint32_t source; |
| 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 { |
| INTERCEPT_KEY_RESULT_UNKNOWN, |
| INTERCEPT_KEY_RESULT_SKIP, |
| INTERCEPT_KEY_RESULT_CONTINUE, |
| INTERCEPT_KEY_RESULT_TRY_AGAIN_LATER, |
| }; |
| InterceptKeyResult interceptKeyResult; // set based on the interception result |
| nsecs_t interceptKeyWakeupTime; // used with INTERCEPT_KEY_RESULT_TRY_AGAIN_LATER |
| |
| KeyEntry(nsecs_t eventTime, |
| int32_t deviceId, uint32_t source, 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(String8& msg) const; |
| void recycle(); |
| |
| protected: |
| virtual ~KeyEntry(); |
| }; |
| |
| struct MotionEntry : EventEntry { |
| nsecs_t eventTime; |
| int32_t deviceId; |
| uint32_t source; |
| int32_t action; |
| int32_t flags; |
| int32_t metaState; |
| int32_t buttonState; |
| int32_t edgeFlags; |
| float xPrecision; |
| float yPrecision; |
| nsecs_t downTime; |
| int32_t displayId; |
| uint32_t pointerCount; |
| PointerProperties pointerProperties[MAX_POINTERS]; |
| PointerCoords pointerCoords[MAX_POINTERS]; |
| |
| MotionEntry(nsecs_t eventTime, |
| int32_t deviceId, uint32_t source, uint32_t policyFlags, |
| int32_t action, int32_t flags, |
| int32_t metaState, int32_t buttonState, int32_t edgeFlags, |
| float xPrecision, float yPrecision, |
| nsecs_t downTime, int32_t displayId, uint32_t pointerCount, |
| const PointerProperties* pointerProperties, const PointerCoords* pointerCoords, |
| float xOffset, float yOffset); |
| virtual void appendDescription(String8& msg) const; |
| |
| protected: |
| 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 scaleFactor; |
| 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 scaleFactor); |
| ~DispatchEntry(); |
| |
| inline bool hasForegroundTarget() const { |
| return targetFlags & InputTarget::FLAG_FOREGROUND; |
| } |
| |
| inline bool isSplit() const { |
| return targetFlags & InputTarget::FLAG_SPLIT; |
| } |
| |
| private: |
| static volatile int32_t sNextSeqAtomic; |
| |
| static uint32_t nextSeq(); |
| }; |
| |
| // 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> { |
| CommandEntry(Command command); |
| ~CommandEntry(); |
| |
| Command command; |
| |
| // parameters for the command (usage varies by command) |
| sp<Connection> connection; |
| nsecs_t eventTime; |
| KeyEntry* keyEntry; |
| sp<InputApplicationHandle> inputApplicationHandle; |
| sp<InputWindowHandle> inputWindowHandle; |
| String8 reason; |
| int32_t userActivityEventType; |
| uint32_t seq; |
| bool handled; |
| }; |
| |
| // Generic queue implementation. |
| template <typename T> |
| struct Queue { |
| T* head; |
| T* tail; |
| |
| inline Queue() : head(NULL), tail(NULL) { |
| } |
| |
| inline bool isEmpty() const { |
| return !head; |
| } |
| |
| inline void enqueueAtTail(T* entry) { |
| entry->prev = tail; |
| if (tail) { |
| tail->next = entry; |
| } else { |
| head = entry; |
| } |
| entry->next = NULL; |
| tail = entry; |
| } |
| |
| inline void enqueueAtHead(T* entry) { |
| entry->next = head; |
| if (head) { |
| head->prev = entry; |
| } else { |
| tail = entry; |
| } |
| entry->prev = NULL; |
| head = entry; |
| } |
| |
| inline void dequeue(T* entry) { |
| if (entry->prev) { |
| entry->prev->next = entry->next; |
| } else { |
| head = entry->next; |
| } |
| if (entry->next) { |
| entry->next->prev = entry->prev; |
| } else { |
| tail = entry->prev; |
| } |
| } |
| |
| inline T* dequeueAtHead() { |
| T* entry = head; |
| head = entry->next; |
| if (head) { |
| head->prev = NULL; |
| } else { |
| tail = NULL; |
| } |
| return entry; |
| } |
| |
| uint32_t count() const; |
| }; |
| |
| /* Specifies which events are to be canceled and why. */ |
| struct CancelationOptions { |
| enum Mode { |
| CANCEL_ALL_EVENTS = 0, |
| CANCEL_POINTER_EVENTS = 1, |
| CANCEL_NON_POINTER_EVENTS = 2, |
| CANCEL_FALLBACK_EVENTS = 3, |
| }; |
| |
| // The criterion to use to determine which events should be canceled. |
| Mode mode; |
| |
| // Descriptive reason for the cancelation. |
| const char* reason; |
| |
| // The specific keycode of the key event to cancel, or -1 to cancel any key event. |
| int32_t keyCode; |
| |
| // The specific device id of events to cancel, or -1 to cancel events from any device. |
| int32_t deviceId; |
| |
| CancelationOptions(Mode mode, const char* reason) : |
| mode(mode), reason(reason), keyCode(-1), deviceId(-1) { } |
| }; |
| |
| /* Tracks dispatched key and motion event state so that cancelation events can be |
| * synthesized when events are dropped. */ |
| class InputState { |
| public: |
| InputState(); |
| ~InputState(); |
| |
| // Returns true if there is no state to be canceled. |
| bool isNeutral() const; |
| |
| // Returns true if the specified source is known to have received a hover enter |
| // motion event. |
| bool isHovering(int32_t deviceId, uint32_t source, int32_t displayId) const; |
| |
| // Records tracking information for a key event that has just been published. |
| // Returns true if the event should be delivered, false if it is inconsistent |
| // and should be skipped. |
| bool trackKey(const KeyEntry* entry, int32_t action, int32_t flags); |
| |
| // Records tracking information for a motion event that has just been published. |
| // Returns true if the event should be delivered, false if it is inconsistent |
| // and should be skipped. |
| bool trackMotion(const MotionEntry* entry, int32_t action, int32_t flags); |
| |
| // Synthesizes cancelation events for the current state and resets the tracked state. |
| void synthesizeCancelationEvents(nsecs_t currentTime, |
| Vector<EventEntry*>& outEvents, const CancelationOptions& options); |
| |
| // Clears the current state. |
| void clear(); |
| |
| // Copies pointer-related parts of the input state to another instance. |
| void copyPointerStateTo(InputState& other) const; |
| |
| // Gets the fallback key associated with a keycode. |
| // Returns -1 if none. |
| // Returns AKEYCODE_UNKNOWN if we are only dispatching the unhandled key to the policy. |
| int32_t getFallbackKey(int32_t originalKeyCode); |
| |
| // Sets the fallback key for a particular keycode. |
| void setFallbackKey(int32_t originalKeyCode, int32_t fallbackKeyCode); |
| |
| // Removes the fallback key for a particular keycode. |
| void removeFallbackKey(int32_t originalKeyCode); |
| |
| inline const KeyedVector<int32_t, int32_t>& getFallbackKeys() const { |
| return mFallbackKeys; |
| } |
| |
| private: |
| struct KeyMemento { |
| int32_t deviceId; |
| uint32_t source; |
| int32_t keyCode; |
| int32_t scanCode; |
| int32_t metaState; |
| int32_t flags; |
| nsecs_t downTime; |
| uint32_t policyFlags; |
| }; |
| |
| struct MotionMemento { |
| int32_t deviceId; |
| uint32_t source; |
| int32_t flags; |
| float xPrecision; |
| float yPrecision; |
| nsecs_t downTime; |
| int32_t displayId; |
| uint32_t pointerCount; |
| PointerProperties pointerProperties[MAX_POINTERS]; |
| PointerCoords pointerCoords[MAX_POINTERS]; |
| bool hovering; |
| uint32_t policyFlags; |
| |
| void setPointers(const MotionEntry* entry); |
| }; |
| |
| Vector<KeyMemento> mKeyMementos; |
| Vector<MotionMemento> mMotionMementos; |
| KeyedVector<int32_t, int32_t> mFallbackKeys; |
| |
| ssize_t findKeyMemento(const KeyEntry* entry) const; |
| ssize_t findMotionMemento(const MotionEntry* entry, bool hovering) const; |
| |
| void addKeyMemento(const KeyEntry* entry, int32_t flags); |
| void addMotionMemento(const MotionEntry* entry, int32_t flags, bool hovering); |
| |
| static bool shouldCancelKey(const KeyMemento& memento, |
| const CancelationOptions& options); |
| static bool shouldCancelMotion(const MotionMemento& memento, |
| const CancelationOptions& options); |
| }; |
| |
| /* Manages the dispatch state associated with a single input channel. */ |
| class Connection : public RefBase { |
| protected: |
| virtual ~Connection(); |
| |
| public: |
| enum Status { |
| // Everything is peachy. |
| STATUS_NORMAL, |
| // An unrecoverable communication error has occurred. |
| STATUS_BROKEN, |
| // The input channel has been unregistered. |
| STATUS_ZOMBIE |
| }; |
| |
| Status status; |
| sp<InputChannel> inputChannel; // never null |
| sp<InputWindowHandle> inputWindowHandle; // may be null |
| bool monitor; |
| InputPublisher inputPublisher; |
| InputState inputState; |
| |
| // True if the socket is full and no further events can be published until |
| // the application consumes some of the input. |
| bool inputPublisherBlocked; |
| |
| // Queue of events that need to be published to the connection. |
| Queue<DispatchEntry> outboundQueue; |
| |
| // Queue of events that have been published to the connection but that have not |
| // yet received a "finished" response from the application. |
| Queue<DispatchEntry> waitQueue; |
| |
| explicit Connection(const sp<InputChannel>& inputChannel, |
| const sp<InputWindowHandle>& inputWindowHandle, bool monitor); |
| |
| inline const char* getInputChannelName() const { return inputChannel->getName().string(); } |
| |
| const char* getWindowName() const; |
| const char* getStatusLabel() const; |
| |
| DispatchEntry* findWaitQueueEntry(uint32_t seq); |
| }; |
| |
| enum DropReason { |
| DROP_REASON_NOT_DROPPED = 0, |
| DROP_REASON_POLICY = 1, |
| DROP_REASON_APP_SWITCH = 2, |
| DROP_REASON_DISABLED = 3, |
| DROP_REASON_BLOCKED = 4, |
| DROP_REASON_STALE = 5, |
| }; |
| |
| sp<InputDispatcherPolicyInterface> mPolicy; |
| InputDispatcherConfiguration mConfig; |
| |
| Mutex mLock; |
| |
| Condition mDispatcherIsAliveCondition; |
| |
| sp<Looper> mLooper; |
| |
| EventEntry* mPendingEvent; |
| Queue<EventEntry> mInboundQueue; |
| Queue<EventEntry> mRecentQueue; |
| Queue<CommandEntry> mCommandQueue; |
| |
| void dispatchOnceInnerLocked(nsecs_t* nextWakeupTime); |
| |
| // Enqueues an inbound event. Returns true if mLooper->wake() should be called. |
| bool enqueueInboundEventLocked(EventEntry* entry); |
| |
| // Cleans up input state when dropping an inbound event. |
| void dropInboundEventLocked(EventEntry* entry, DropReason dropReason); |
| |
| // Adds an event to a queue of recent events for debugging purposes. |
| void addRecentEventLocked(EventEntry* entry); |
| |
| // App switch latency optimization. |
| bool mAppSwitchSawKeyDown; |
| nsecs_t mAppSwitchDueTime; |
| |
| static bool isAppSwitchKeyCode(int32_t keyCode); |
| bool isAppSwitchKeyEventLocked(KeyEntry* keyEntry); |
| bool isAppSwitchPendingLocked(); |
| void resetPendingAppSwitchLocked(bool handled); |
| |
| // Stale event latency optimization. |
| static bool isStaleEventLocked(nsecs_t currentTime, EventEntry* entry); |
| |
| // Blocked event latency optimization. Drops old events when the user intends |
| // to transfer focus to a new application. |
| EventEntry* mNextUnblockedEvent; |
| |
| sp<InputWindowHandle> findTouchedWindowAtLocked(int32_t displayId, int32_t x, int32_t y); |
| |
| // All registered connections mapped by channel file descriptor. |
| KeyedVector<int, sp<Connection> > mConnectionsByFd; |
| |
| ssize_t getConnectionIndexLocked(const sp<InputChannel>& inputChannel); |
| |
| // Input channels that will receive a copy of all input events. |
| Vector<sp<InputChannel> > mMonitoringChannels; |
| |
| // Event injection and synchronization. |
| Condition mInjectionResultAvailableCondition; |
| bool hasInjectionPermission(int32_t injectorPid, int32_t injectorUid); |
| void setInjectionResultLocked(EventEntry* entry, int32_t injectionResult); |
| |
| Condition mInjectionSyncFinishedCondition; |
| void incrementPendingForegroundDispatchesLocked(EventEntry* entry); |
| void decrementPendingForegroundDispatchesLocked(EventEntry* entry); |
| |
| // Key repeat tracking. |
| struct KeyRepeatState { |
| KeyEntry* lastKeyEntry; // or null if no repeat |
| nsecs_t nextRepeatTime; |
| } mKeyRepeatState; |
| |
| void resetKeyRepeatLocked(); |
| KeyEntry* synthesizeKeyRepeatLocked(nsecs_t currentTime); |
| |
| // Deferred command processing. |
| bool haveCommandsLocked() const; |
| bool runCommandsLockedInterruptible(); |
| CommandEntry* postCommandLocked(Command command); |
| |
| // Input filter processing. |
| bool shouldSendKeyToInputFilterLocked(const NotifyKeyArgs* args); |
| bool shouldSendMotionToInputFilterLocked(const NotifyMotionArgs* args); |
| |
| // Inbound event processing. |
| void drainInboundQueueLocked(); |
| void releasePendingEventLocked(); |
| void releaseInboundEventLocked(EventEntry* entry); |
| |
| // Dispatch state. |
| bool mDispatchEnabled; |
| bool mDispatchFrozen; |
| bool mInputFilterEnabled; |
| |
| Vector<sp<InputWindowHandle> > mWindowHandles; |
| |
| sp<InputWindowHandle> getWindowHandleLocked(const sp<InputChannel>& inputChannel) const; |
| bool hasWindowHandleLocked(const sp<InputWindowHandle>& windowHandle) const; |
| |
| // Focus tracking for keys, trackball, etc. |
| sp<InputWindowHandle> mFocusedWindowHandle; |
| |
| // Focus tracking for touch. |
| struct TouchedWindow { |
| sp<InputWindowHandle> windowHandle; |
| int32_t targetFlags; |
| BitSet32 pointerIds; // zero unless target flag FLAG_SPLIT is set |
| }; |
| struct TouchState { |
| bool down; |
| bool split; |
| int32_t deviceId; // id of the device that is currently down, others are rejected |
| uint32_t source; // source of the device that is current down, others are rejected |
| int32_t displayId; // id to the display that currently has a touch, others are rejected |
| Vector<TouchedWindow> windows; |
| |
| TouchState(); |
| ~TouchState(); |
| void reset(); |
| void copyFrom(const TouchState& other); |
| void addOrUpdateWindow(const sp<InputWindowHandle>& windowHandle, |
| int32_t targetFlags, BitSet32 pointerIds); |
| void removeWindow(const sp<InputWindowHandle>& windowHandle); |
| void filterNonAsIsTouchWindows(); |
| sp<InputWindowHandle> getFirstForegroundWindowHandle() const; |
| bool isSlippery() const; |
| }; |
| |
| KeyedVector<int32_t, TouchState> mTouchStatesByDisplay; |
| TouchState mTempTouchState; |
| |
| // Focused application. |
| sp<InputApplicationHandle> mFocusedApplicationHandle; |
| |
| // Dispatcher state at time of last ANR. |
| String8 mLastANRState; |
| |
| // Dispatch inbound events. |
| bool dispatchConfigurationChangedLocked( |
| nsecs_t currentTime, ConfigurationChangedEntry* entry); |
| bool dispatchDeviceResetLocked( |
| nsecs_t currentTime, DeviceResetEntry* entry); |
| bool dispatchKeyLocked( |
| nsecs_t currentTime, KeyEntry* entry, |
| DropReason* dropReason, nsecs_t* nextWakeupTime); |
| bool dispatchMotionLocked( |
| nsecs_t currentTime, MotionEntry* entry, |
| DropReason* dropReason, nsecs_t* nextWakeupTime); |
| void dispatchEventLocked(nsecs_t currentTime, EventEntry* entry, |
| const Vector<InputTarget>& inputTargets); |
| |
| void logOutboundKeyDetailsLocked(const char* prefix, const KeyEntry* entry); |
| void logOutboundMotionDetailsLocked(const char* prefix, const MotionEntry* entry); |
| |
| // Keeping track of ANR timeouts. |
| enum InputTargetWaitCause { |
| INPUT_TARGET_WAIT_CAUSE_NONE, |
| INPUT_TARGET_WAIT_CAUSE_SYSTEM_NOT_READY, |
| INPUT_TARGET_WAIT_CAUSE_APPLICATION_NOT_READY, |
| }; |
| |
| InputTargetWaitCause mInputTargetWaitCause; |
| nsecs_t mInputTargetWaitStartTime; |
| nsecs_t mInputTargetWaitTimeoutTime; |
| bool mInputTargetWaitTimeoutExpired; |
| sp<InputApplicationHandle> mInputTargetWaitApplicationHandle; |
| |
| // Contains the last window which received a hover event. |
| sp<InputWindowHandle> mLastHoverWindowHandle; |
| |
| // Finding targets for input events. |
| int32_t handleTargetsNotReadyLocked(nsecs_t currentTime, const EventEntry* entry, |
| const sp<InputApplicationHandle>& applicationHandle, |
| const sp<InputWindowHandle>& windowHandle, |
| nsecs_t* nextWakeupTime, const char* reason); |
| void resumeAfterTargetsNotReadyTimeoutLocked(nsecs_t newTimeout, |
| const sp<InputChannel>& inputChannel); |
| nsecs_t getTimeSpentWaitingForApplicationLocked(nsecs_t currentTime); |
| void resetANRTimeoutsLocked(); |
| |
| int32_t findFocusedWindowTargetsLocked(nsecs_t currentTime, const EventEntry* entry, |
| Vector<InputTarget>& inputTargets, nsecs_t* nextWakeupTime); |
| int32_t findTouchedWindowTargetsLocked(nsecs_t currentTime, const MotionEntry* entry, |
| Vector<InputTarget>& inputTargets, nsecs_t* nextWakeupTime, |
| bool* outConflictingPointerActions); |
| |
| void addWindowTargetLocked(const sp<InputWindowHandle>& windowHandle, |
| int32_t targetFlags, BitSet32 pointerIds, Vector<InputTarget>& inputTargets); |
| void addMonitoringTargetsLocked(Vector<InputTarget>& inputTargets); |
| |
| void pokeUserActivityLocked(const EventEntry* eventEntry); |
| bool checkInjectionPermission(const sp<InputWindowHandle>& windowHandle, |
| const InjectionState* injectionState); |
| bool isWindowObscuredAtPointLocked(const sp<InputWindowHandle>& windowHandle, |
| int32_t x, int32_t y) const; |
| bool isWindowReadyForMoreInputLocked(nsecs_t currentTime, |
| const sp<InputWindowHandle>& windowHandle, const EventEntry* eventEntry); |
| String8 getApplicationWindowLabelLocked(const sp<InputApplicationHandle>& applicationHandle, |
| const sp<InputWindowHandle>& windowHandle); |
| |
| // Manage the dispatch cycle for a single connection. |
| // These methods are deliberately not Interruptible because doing all of the work |
| // with the mutex held makes it easier to ensure that connection invariants are maintained. |
| // If needed, the methods post commands to run later once the critical bits are done. |
| void prepareDispatchCycleLocked(nsecs_t currentTime, const sp<Connection>& connection, |
| EventEntry* eventEntry, const InputTarget* inputTarget); |
| void enqueueDispatchEntriesLocked(nsecs_t currentTime, const sp<Connection>& connection, |
| EventEntry* eventEntry, const InputTarget* inputTarget); |
| void enqueueDispatchEntryLocked(const sp<Connection>& connection, |
| EventEntry* eventEntry, const InputTarget* inputTarget, int32_t dispatchMode); |
| void startDispatchCycleLocked(nsecs_t currentTime, const sp<Connection>& connection); |
| void finishDispatchCycleLocked(nsecs_t currentTime, const sp<Connection>& connection, |
| uint32_t seq, bool handled); |
| void abortBrokenDispatchCycleLocked(nsecs_t currentTime, const sp<Connection>& connection, |
| bool notify); |
| void drainDispatchQueueLocked(Queue<DispatchEntry>* queue); |
| void releaseDispatchEntryLocked(DispatchEntry* dispatchEntry); |
| static int handleReceiveCallback(int fd, int events, void* data); |
| |
| void synthesizeCancelationEventsForAllConnectionsLocked( |
| const CancelationOptions& options); |
| void synthesizeCancelationEventsForInputChannelLocked(const sp<InputChannel>& channel, |
| const CancelationOptions& options); |
| void synthesizeCancelationEventsForConnectionLocked(const sp<Connection>& connection, |
| const CancelationOptions& options); |
| |
| // Splitting motion events across windows. |
| MotionEntry* splitMotionEvent(const MotionEntry* originalMotionEntry, BitSet32 pointerIds); |
| |
| // Reset and drop everything the dispatcher is doing. |
| void resetAndDropEverythingLocked(const char* reason); |
| |
| // Dump state. |
| void dumpDispatchStateLocked(String8& dump); |
| void logDispatchStateLocked(); |
| |
| // Registration. |
| void removeMonitorChannelLocked(const sp<InputChannel>& inputChannel); |
| status_t unregisterInputChannelLocked(const sp<InputChannel>& inputChannel, bool notify); |
| |
| // Add or remove a connection to the mActiveConnections vector. |
| void activateConnectionLocked(Connection* connection); |
| void deactivateConnectionLocked(Connection* connection); |
| |
| // Interesting events that we might like to log or tell the framework about. |
| void onDispatchCycleFinishedLocked( |
| nsecs_t currentTime, const sp<Connection>& connection, uint32_t seq, bool handled); |
| void onDispatchCycleBrokenLocked( |
| nsecs_t currentTime, const sp<Connection>& connection); |
| void onANRLocked( |
| nsecs_t currentTime, const sp<InputApplicationHandle>& applicationHandle, |
| const sp<InputWindowHandle>& windowHandle, |
| nsecs_t eventTime, nsecs_t waitStartTime, const char* reason); |
| |
| // Outbound policy interactions. |
| void doNotifyConfigurationChangedInterruptible(CommandEntry* commandEntry); |
| void doNotifyInputChannelBrokenLockedInterruptible(CommandEntry* commandEntry); |
| void doNotifyANRLockedInterruptible(CommandEntry* commandEntry); |
| void doInterceptKeyBeforeDispatchingLockedInterruptible(CommandEntry* commandEntry); |
| void doDispatchCycleFinishedLockedInterruptible(CommandEntry* commandEntry); |
| bool afterKeyEventLockedInterruptible(const sp<Connection>& connection, |
| DispatchEntry* dispatchEntry, KeyEntry* keyEntry, bool handled); |
| bool afterMotionEventLockedInterruptible(const sp<Connection>& connection, |
| DispatchEntry* dispatchEntry, MotionEntry* motionEntry, bool handled); |
| void doPokeUserActivityLockedInterruptible(CommandEntry* commandEntry); |
| void initializeKeyEvent(KeyEvent* event, const KeyEntry* entry); |
| |
| // Statistics gathering. |
| void updateDispatchStatisticsLocked(nsecs_t currentTime, const EventEntry* entry, |
| int32_t injectionResult, nsecs_t timeSpentWaitingForApplication); |
| void traceInboundQueueLengthLocked(); |
| void traceOutboundQueueLengthLocked(const sp<Connection>& connection); |
| void traceWaitQueueLengthLocked(const sp<Connection>& connection); |
| }; |
| |
| /* Enqueues and dispatches input events, endlessly. */ |
| class InputDispatcherThread : public Thread { |
| public: |
| explicit InputDispatcherThread(const sp<InputDispatcherInterface>& dispatcher); |
| ~InputDispatcherThread(); |
| |
| private: |
| virtual bool threadLoop(); |
| |
| sp<InputDispatcherInterface> mDispatcher; |
| }; |
| |
| } // namespace android |
| |
| #endif // _UI_INPUT_DISPATCHER_H |