InputDispatcher.h revision 265f1ccc5128319d81eee70ee2d2ae81573efb11
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef _UI_INPUT_DISPATCHER_H 18#define _UI_INPUT_DISPATCHER_H 19 20#include <androidfw/Input.h> 21#include <androidfw/InputTransport.h> 22#include <utils/KeyedVector.h> 23#include <utils/Vector.h> 24#include <utils/threads.h> 25#include <utils/Timers.h> 26#include <utils/RefBase.h> 27#include <utils/String8.h> 28#include <utils/Looper.h> 29#include <utils/BitSet.h> 30#include <cutils/atomic.h> 31 32#include <stddef.h> 33#include <unistd.h> 34#include <limits.h> 35 36#include "InputWindow.h" 37#include "InputApplication.h" 38#include "InputListener.h" 39 40 41namespace android { 42 43/* 44 * Constants used to report the outcome of input event injection. 45 */ 46enum { 47 /* (INTERNAL USE ONLY) Specifies that injection is pending and its outcome is unknown. */ 48 INPUT_EVENT_INJECTION_PENDING = -1, 49 50 /* Injection succeeded. */ 51 INPUT_EVENT_INJECTION_SUCCEEDED = 0, 52 53 /* Injection failed because the injector did not have permission to inject 54 * into the application with input focus. */ 55 INPUT_EVENT_INJECTION_PERMISSION_DENIED = 1, 56 57 /* Injection failed because there were no available input targets. */ 58 INPUT_EVENT_INJECTION_FAILED = 2, 59 60 /* Injection failed due to a timeout. */ 61 INPUT_EVENT_INJECTION_TIMED_OUT = 3 62}; 63 64/* 65 * Constants used to determine the input event injection synchronization mode. 66 */ 67enum { 68 /* Injection is asynchronous and is assumed always to be successful. */ 69 INPUT_EVENT_INJECTION_SYNC_NONE = 0, 70 71 /* Waits for previous events to be dispatched so that the input dispatcher can determine 72 * whether input event injection willbe permitted based on the current input focus. 73 * Does not wait for the input event to finish processing. */ 74 INPUT_EVENT_INJECTION_SYNC_WAIT_FOR_RESULT = 1, 75 76 /* Waits for the input event to be completely processed. */ 77 INPUT_EVENT_INJECTION_SYNC_WAIT_FOR_FINISHED = 2, 78}; 79 80 81/* 82 * An input target specifies how an input event is to be dispatched to a particular window 83 * including the window's input channel, control flags, a timeout, and an X / Y offset to 84 * be added to input event coordinates to compensate for the absolute position of the 85 * window area. 86 */ 87struct InputTarget { 88 enum { 89 /* This flag indicates that the event is being delivered to a foreground application. */ 90 FLAG_FOREGROUND = 1 << 0, 91 92 /* This flag indicates that the target of a MotionEvent is partly or wholly 93 * obscured by another visible window above it. The motion event should be 94 * delivered with flag AMOTION_EVENT_FLAG_WINDOW_IS_OBSCURED. */ 95 FLAG_WINDOW_IS_OBSCURED = 1 << 1, 96 97 /* This flag indicates that a motion event is being split across multiple windows. */ 98 FLAG_SPLIT = 1 << 2, 99 100 /* This flag indicates that the pointer coordinates dispatched to the application 101 * will be zeroed out to avoid revealing information to an application. This is 102 * used in conjunction with FLAG_DISPATCH_AS_OUTSIDE to prevent apps not sharing 103 * the same UID from watching all touches. */ 104 FLAG_ZERO_COORDS = 1 << 3, 105 106 /* This flag indicates that the event should be sent as is. 107 * Should always be set unless the event is to be transmuted. */ 108 FLAG_DISPATCH_AS_IS = 1 << 8, 109 110 /* This flag indicates that a MotionEvent with AMOTION_EVENT_ACTION_DOWN falls outside 111 * of the area of this target and so should instead be delivered as an 112 * AMOTION_EVENT_ACTION_OUTSIDE to this target. */ 113 FLAG_DISPATCH_AS_OUTSIDE = 1 << 9, 114 115 /* This flag indicates that a hover sequence is starting in the given window. 116 * The event is transmuted into ACTION_HOVER_ENTER. */ 117 FLAG_DISPATCH_AS_HOVER_ENTER = 1 << 10, 118 119 /* This flag indicates that a hover event happened outside of a window which handled 120 * previous hover events, signifying the end of the current hover sequence for that 121 * window. 122 * The event is transmuted into ACTION_HOVER_ENTER. */ 123 FLAG_DISPATCH_AS_HOVER_EXIT = 1 << 11, 124 125 /* This flag indicates that the event should be canceled. 126 * It is used to transmute ACTION_MOVE into ACTION_CANCEL when a touch slips 127 * outside of a window. */ 128 FLAG_DISPATCH_AS_SLIPPERY_EXIT = 1 << 12, 129 130 /* This flag indicates that the event should be dispatched as an initial down. 131 * It is used to transmute ACTION_MOVE into ACTION_DOWN when a touch slips 132 * into a new window. */ 133 FLAG_DISPATCH_AS_SLIPPERY_ENTER = 1 << 13, 134 135 /* Mask for all dispatch modes. */ 136 FLAG_DISPATCH_MASK = FLAG_DISPATCH_AS_IS 137 | FLAG_DISPATCH_AS_OUTSIDE 138 | FLAG_DISPATCH_AS_HOVER_ENTER 139 | FLAG_DISPATCH_AS_HOVER_EXIT 140 | FLAG_DISPATCH_AS_SLIPPERY_EXIT 141 | FLAG_DISPATCH_AS_SLIPPERY_ENTER, 142 }; 143 144 // The input channel to be targeted. 145 sp<InputChannel> inputChannel; 146 147 // Flags for the input target. 148 int32_t flags; 149 150 // The x and y offset to add to a MotionEvent as it is delivered. 151 // (ignored for KeyEvents) 152 float xOffset, yOffset; 153 154 // Scaling factor to apply to MotionEvent as it is delivered. 155 // (ignored for KeyEvents) 156 float scaleFactor; 157 158 // The subset of pointer ids to include in motion events dispatched to this input target 159 // if FLAG_SPLIT is set. 160 BitSet32 pointerIds; 161}; 162 163 164/* 165 * Input dispatcher configuration. 166 * 167 * Specifies various options that modify the behavior of the input dispatcher. 168 */ 169struct InputDispatcherConfiguration { 170 // The key repeat initial timeout. 171 nsecs_t keyRepeatTimeout; 172 173 // The key repeat inter-key delay. 174 nsecs_t keyRepeatDelay; 175 176 InputDispatcherConfiguration() : 177 keyRepeatTimeout(500 * 1000000LL), 178 keyRepeatDelay(50 * 1000000LL) { } 179}; 180 181 182/* 183 * Input dispatcher policy interface. 184 * 185 * The input reader policy is used by the input reader to interact with the Window Manager 186 * and other system components. 187 * 188 * The actual implementation is partially supported by callbacks into the DVM 189 * via JNI. This interface is also mocked in the unit tests. 190 */ 191class InputDispatcherPolicyInterface : public virtual RefBase { 192protected: 193 InputDispatcherPolicyInterface() { } 194 virtual ~InputDispatcherPolicyInterface() { } 195 196public: 197 /* Notifies the system that a configuration change has occurred. */ 198 virtual void notifyConfigurationChanged(nsecs_t when) = 0; 199 200 /* Notifies the system that an application is not responding. 201 * Returns a new timeout to continue waiting, or 0 to abort dispatch. */ 202 virtual nsecs_t notifyANR(const sp<InputApplicationHandle>& inputApplicationHandle, 203 const sp<InputWindowHandle>& inputWindowHandle) = 0; 204 205 /* Notifies the system that an input channel is unrecoverably broken. */ 206 virtual void notifyInputChannelBroken(const sp<InputWindowHandle>& inputWindowHandle) = 0; 207 208 /* Gets the input dispatcher configuration. */ 209 virtual void getDispatcherConfiguration(InputDispatcherConfiguration* outConfig) = 0; 210 211 /* Returns true if automatic key repeating is enabled. */ 212 virtual bool isKeyRepeatEnabled() = 0; 213 214 /* Filters an input event. 215 * Return true to dispatch the event unmodified, false to consume the event. 216 * A filter can also transform and inject events later by passing POLICY_FLAG_FILTERED 217 * to injectInputEvent. 218 */ 219 virtual bool filterInputEvent(const InputEvent* inputEvent, uint32_t policyFlags) = 0; 220 221 /* Intercepts a key event immediately before queueing it. 222 * The policy can use this method as an opportunity to perform power management functions 223 * and early event preprocessing such as updating policy flags. 224 * 225 * This method is expected to set the POLICY_FLAG_PASS_TO_USER policy flag if the event 226 * should be dispatched to applications. 227 */ 228 virtual void interceptKeyBeforeQueueing(const KeyEvent* keyEvent, uint32_t& policyFlags) = 0; 229 230 /* Intercepts a touch, trackball or other motion event before queueing it. 231 * The policy can use this method as an opportunity to perform power management functions 232 * and early event preprocessing such as updating policy flags. 233 * 234 * This method is expected to set the POLICY_FLAG_PASS_TO_USER policy flag if the event 235 * should be dispatched to applications. 236 */ 237 virtual void interceptMotionBeforeQueueing(nsecs_t when, uint32_t& policyFlags) = 0; 238 239 /* Allows the policy a chance to intercept a key before dispatching. */ 240 virtual nsecs_t interceptKeyBeforeDispatching(const sp<InputWindowHandle>& inputWindowHandle, 241 const KeyEvent* keyEvent, uint32_t policyFlags) = 0; 242 243 /* Allows the policy a chance to perform default processing for an unhandled key. 244 * Returns an alternate keycode to redispatch as a fallback, or 0 to give up. */ 245 virtual bool dispatchUnhandledKey(const sp<InputWindowHandle>& inputWindowHandle, 246 const KeyEvent* keyEvent, uint32_t policyFlags, KeyEvent* outFallbackKeyEvent) = 0; 247 248 /* Notifies the policy about switch events. 249 */ 250 virtual void notifySwitch(nsecs_t when, 251 int32_t switchCode, int32_t switchValue, uint32_t policyFlags) = 0; 252 253 /* Poke user activity for an event dispatched to a window. */ 254 virtual void pokeUserActivity(nsecs_t eventTime, int32_t eventType) = 0; 255 256 /* Checks whether a given application pid/uid has permission to inject input events 257 * into other applications. 258 * 259 * This method is special in that its implementation promises to be non-reentrant and 260 * is safe to call while holding other locks. (Most other methods make no such guarantees!) 261 */ 262 virtual bool checkInjectEventsPermissionNonReentrant( 263 int32_t injectorPid, int32_t injectorUid) = 0; 264}; 265 266 267/* Notifies the system about input events generated by the input reader. 268 * The dispatcher is expected to be mostly asynchronous. */ 269class InputDispatcherInterface : public virtual RefBase, public InputListenerInterface { 270protected: 271 InputDispatcherInterface() { } 272 virtual ~InputDispatcherInterface() { } 273 274public: 275 /* Dumps the state of the input dispatcher. 276 * 277 * This method may be called on any thread (usually by the input manager). */ 278 virtual void dump(String8& dump) = 0; 279 280 /* Called by the heatbeat to ensures that the dispatcher has not deadlocked. */ 281 virtual void monitor() = 0; 282 283 /* Runs a single iteration of the dispatch loop. 284 * Nominally processes one queued event, a timeout, or a response from an input consumer. 285 * 286 * This method should only be called on the input dispatcher thread. 287 */ 288 virtual void dispatchOnce() = 0; 289 290 /* Injects an input event and optionally waits for sync. 291 * The synchronization mode determines whether the method blocks while waiting for 292 * input injection to proceed. 293 * Returns one of the INPUT_EVENT_INJECTION_XXX constants. 294 * 295 * This method may be called on any thread (usually by the input manager). 296 */ 297 virtual int32_t injectInputEvent(const InputEvent* event, 298 int32_t injectorPid, int32_t injectorUid, int32_t syncMode, int32_t timeoutMillis, 299 uint32_t policyFlags) = 0; 300 301 /* Sets the list of input windows. 302 * 303 * This method may be called on any thread (usually by the input manager). 304 */ 305 virtual void setInputWindows(const Vector<sp<InputWindowHandle> >& inputWindowHandles) = 0; 306 307 /* Sets the focused application. 308 * 309 * This method may be called on any thread (usually by the input manager). 310 */ 311 virtual void setFocusedApplication( 312 const sp<InputApplicationHandle>& inputApplicationHandle) = 0; 313 314 /* Sets the input dispatching mode. 315 * 316 * This method may be called on any thread (usually by the input manager). 317 */ 318 virtual void setInputDispatchMode(bool enabled, bool frozen) = 0; 319 320 /* Sets whether input event filtering is enabled. 321 * When enabled, incoming input events are sent to the policy's filterInputEvent 322 * method instead of being dispatched. The filter is expected to use 323 * injectInputEvent to inject the events it would like to have dispatched. 324 * It should include POLICY_FLAG_FILTERED in the policy flags during injection. 325 */ 326 virtual void setInputFilterEnabled(bool enabled) = 0; 327 328 /* Transfers touch focus from the window associated with one channel to the 329 * window associated with the other channel. 330 * 331 * Returns true on success. False if the window did not actually have touch focus. 332 */ 333 virtual bool transferTouchFocus(const sp<InputChannel>& fromChannel, 334 const sp<InputChannel>& toChannel) = 0; 335 336 /* Registers or unregister input channels that may be used as targets for input events. 337 * If monitor is true, the channel will receive a copy of all input events. 338 * 339 * These methods may be called on any thread (usually by the input manager). 340 */ 341 virtual status_t registerInputChannel(const sp<InputChannel>& inputChannel, 342 const sp<InputWindowHandle>& inputWindowHandle, bool monitor) = 0; 343 virtual status_t unregisterInputChannel(const sp<InputChannel>& inputChannel) = 0; 344}; 345 346/* Dispatches events to input targets. Some functions of the input dispatcher, such as 347 * identifying input targets, are controlled by a separate policy object. 348 * 349 * IMPORTANT INVARIANT: 350 * Because the policy can potentially block or cause re-entrance into the input dispatcher, 351 * the input dispatcher never calls into the policy while holding its internal locks. 352 * The implementation is also carefully designed to recover from scenarios such as an 353 * input channel becoming unregistered while identifying input targets or processing timeouts. 354 * 355 * Methods marked 'Locked' must be called with the lock acquired. 356 * 357 * Methods marked 'LockedInterruptible' must be called with the lock acquired but 358 * may during the course of their execution release the lock, call into the policy, and 359 * then reacquire the lock. The caller is responsible for recovering gracefully. 360 * 361 * A 'LockedInterruptible' method may called a 'Locked' method, but NOT vice-versa. 362 */ 363class InputDispatcher : public InputDispatcherInterface { 364protected: 365 virtual ~InputDispatcher(); 366 367public: 368 explicit InputDispatcher(const sp<InputDispatcherPolicyInterface>& policy); 369 370 virtual void dump(String8& dump); 371 virtual void monitor(); 372 373 virtual void dispatchOnce(); 374 375 virtual void notifyConfigurationChanged(const NotifyConfigurationChangedArgs* args); 376 virtual void notifyKey(const NotifyKeyArgs* args); 377 virtual void notifyMotion(const NotifyMotionArgs* args); 378 virtual void notifySwitch(const NotifySwitchArgs* args); 379 virtual void notifyDeviceReset(const NotifyDeviceResetArgs* args); 380 381 virtual int32_t injectInputEvent(const InputEvent* event, 382 int32_t injectorPid, int32_t injectorUid, int32_t syncMode, int32_t timeoutMillis, 383 uint32_t policyFlags); 384 385 virtual void setInputWindows(const Vector<sp<InputWindowHandle> >& inputWindowHandles); 386 virtual void setFocusedApplication(const sp<InputApplicationHandle>& inputApplicationHandle); 387 virtual void setInputDispatchMode(bool enabled, bool frozen); 388 virtual void setInputFilterEnabled(bool enabled); 389 390 virtual bool transferTouchFocus(const sp<InputChannel>& fromChannel, 391 const sp<InputChannel>& toChannel); 392 393 virtual status_t registerInputChannel(const sp<InputChannel>& inputChannel, 394 const sp<InputWindowHandle>& inputWindowHandle, bool monitor); 395 virtual status_t unregisterInputChannel(const sp<InputChannel>& inputChannel); 396 397private: 398 template <typename T> 399 struct Link { 400 T* next; 401 T* prev; 402 403 protected: 404 inline Link() : next(NULL), prev(NULL) { } 405 }; 406 407 struct InjectionState { 408 mutable int32_t refCount; 409 410 int32_t injectorPid; 411 int32_t injectorUid; 412 int32_t injectionResult; // initially INPUT_EVENT_INJECTION_PENDING 413 bool injectionIsAsync; // set to true if injection is not waiting for the result 414 int32_t pendingForegroundDispatches; // the number of foreground dispatches in progress 415 416 InjectionState(int32_t injectorPid, int32_t injectorUid); 417 void release(); 418 419 private: 420 ~InjectionState(); 421 }; 422 423 struct EventEntry : Link<EventEntry> { 424 enum { 425 TYPE_CONFIGURATION_CHANGED, 426 TYPE_DEVICE_RESET, 427 TYPE_KEY, 428 TYPE_MOTION 429 }; 430 431 mutable int32_t refCount; 432 int32_t type; 433 nsecs_t eventTime; 434 uint32_t policyFlags; 435 InjectionState* injectionState; 436 437 bool dispatchInProgress; // initially false, set to true while dispatching 438 439 inline bool isInjected() const { return injectionState != NULL; } 440 441 void release(); 442 443 virtual void appendDescription(String8& msg) const = 0; 444 445 protected: 446 EventEntry(int32_t type, nsecs_t eventTime, uint32_t policyFlags); 447 virtual ~EventEntry(); 448 void releaseInjectionState(); 449 }; 450 451 struct ConfigurationChangedEntry : EventEntry { 452 ConfigurationChangedEntry(nsecs_t eventTime); 453 virtual void appendDescription(String8& msg) const; 454 455 protected: 456 virtual ~ConfigurationChangedEntry(); 457 }; 458 459 struct DeviceResetEntry : EventEntry { 460 int32_t deviceId; 461 462 DeviceResetEntry(nsecs_t eventTime, int32_t deviceId); 463 virtual void appendDescription(String8& msg) const; 464 465 protected: 466 virtual ~DeviceResetEntry(); 467 }; 468 469 struct KeyEntry : EventEntry { 470 int32_t deviceId; 471 uint32_t source; 472 int32_t action; 473 int32_t flags; 474 int32_t keyCode; 475 int32_t scanCode; 476 int32_t metaState; 477 int32_t repeatCount; 478 nsecs_t downTime; 479 480 bool syntheticRepeat; // set to true for synthetic key repeats 481 482 enum InterceptKeyResult { 483 INTERCEPT_KEY_RESULT_UNKNOWN, 484 INTERCEPT_KEY_RESULT_SKIP, 485 INTERCEPT_KEY_RESULT_CONTINUE, 486 INTERCEPT_KEY_RESULT_TRY_AGAIN_LATER, 487 }; 488 InterceptKeyResult interceptKeyResult; // set based on the interception result 489 nsecs_t interceptKeyWakeupTime; // used with INTERCEPT_KEY_RESULT_TRY_AGAIN_LATER 490 491 KeyEntry(nsecs_t eventTime, 492 int32_t deviceId, uint32_t source, uint32_t policyFlags, int32_t action, 493 int32_t flags, int32_t keyCode, int32_t scanCode, int32_t metaState, 494 int32_t repeatCount, nsecs_t downTime); 495 virtual void appendDescription(String8& msg) const; 496 void recycle(); 497 498 protected: 499 virtual ~KeyEntry(); 500 }; 501 502 struct MotionEntry : EventEntry { 503 nsecs_t eventTime; 504 int32_t deviceId; 505 uint32_t source; 506 int32_t action; 507 int32_t flags; 508 int32_t metaState; 509 int32_t buttonState; 510 int32_t edgeFlags; 511 float xPrecision; 512 float yPrecision; 513 nsecs_t downTime; 514 uint32_t pointerCount; 515 PointerProperties pointerProperties[MAX_POINTERS]; 516 PointerCoords pointerCoords[MAX_POINTERS]; 517 518 MotionEntry(nsecs_t eventTime, 519 int32_t deviceId, uint32_t source, uint32_t policyFlags, int32_t action, 520 int32_t flags, int32_t metaState, int32_t buttonState, int32_t edgeFlags, 521 float xPrecision, float yPrecision, 522 nsecs_t downTime, uint32_t pointerCount, 523 const PointerProperties* pointerProperties, const PointerCoords* pointerCoords); 524 virtual void appendDescription(String8& msg) const; 525 526 protected: 527 virtual ~MotionEntry(); 528 }; 529 530 // Tracks the progress of dispatching a particular event to a particular connection. 531 struct DispatchEntry : Link<DispatchEntry> { 532 const uint32_t seq; // unique sequence number, never 0 533 534 EventEntry* eventEntry; // the event to dispatch 535 int32_t targetFlags; 536 float xOffset; 537 float yOffset; 538 float scaleFactor; 539 nsecs_t deliveryTime; // time when the event was actually delivered 540 541 // Set to the resolved action and flags when the event is enqueued. 542 int32_t resolvedAction; 543 int32_t resolvedFlags; 544 545 DispatchEntry(EventEntry* eventEntry, 546 int32_t targetFlags, float xOffset, float yOffset, float scaleFactor); 547 ~DispatchEntry(); 548 549 inline bool hasForegroundTarget() const { 550 return targetFlags & InputTarget::FLAG_FOREGROUND; 551 } 552 553 inline bool isSplit() const { 554 return targetFlags & InputTarget::FLAG_SPLIT; 555 } 556 557 private: 558 static volatile int32_t sNextSeqAtomic; 559 560 static uint32_t nextSeq(); 561 }; 562 563 // A command entry captures state and behavior for an action to be performed in the 564 // dispatch loop after the initial processing has taken place. It is essentially 565 // a kind of continuation used to postpone sensitive policy interactions to a point 566 // in the dispatch loop where it is safe to release the lock (generally after finishing 567 // the critical parts of the dispatch cycle). 568 // 569 // The special thing about commands is that they can voluntarily release and reacquire 570 // the dispatcher lock at will. Initially when the command starts running, the 571 // dispatcher lock is held. However, if the command needs to call into the policy to 572 // do some work, it can release the lock, do the work, then reacquire the lock again 573 // before returning. 574 // 575 // This mechanism is a bit clunky but it helps to preserve the invariant that the dispatch 576 // never calls into the policy while holding its lock. 577 // 578 // Commands are implicitly 'LockedInterruptible'. 579 struct CommandEntry; 580 typedef void (InputDispatcher::*Command)(CommandEntry* commandEntry); 581 582 class Connection; 583 struct CommandEntry : Link<CommandEntry> { 584 CommandEntry(Command command); 585 ~CommandEntry(); 586 587 Command command; 588 589 // parameters for the command (usage varies by command) 590 sp<Connection> connection; 591 nsecs_t eventTime; 592 KeyEntry* keyEntry; 593 sp<InputApplicationHandle> inputApplicationHandle; 594 sp<InputWindowHandle> inputWindowHandle; 595 int32_t userActivityEventType; 596 uint32_t seq; 597 bool handled; 598 }; 599 600 // Generic queue implementation. 601 template <typename T> 602 struct Queue { 603 T* head; 604 T* tail; 605 606 inline Queue() : head(NULL), tail(NULL) { 607 } 608 609 inline bool isEmpty() const { 610 return !head; 611 } 612 613 inline void enqueueAtTail(T* entry) { 614 entry->prev = tail; 615 if (tail) { 616 tail->next = entry; 617 } else { 618 head = entry; 619 } 620 entry->next = NULL; 621 tail = entry; 622 } 623 624 inline void enqueueAtHead(T* entry) { 625 entry->next = head; 626 if (head) { 627 head->prev = entry; 628 } else { 629 tail = entry; 630 } 631 entry->prev = NULL; 632 head = entry; 633 } 634 635 inline void dequeue(T* entry) { 636 if (entry->prev) { 637 entry->prev->next = entry->next; 638 } else { 639 head = entry->next; 640 } 641 if (entry->next) { 642 entry->next->prev = entry->prev; 643 } else { 644 tail = entry->prev; 645 } 646 } 647 648 inline T* dequeueAtHead() { 649 T* entry = head; 650 head = entry->next; 651 if (head) { 652 head->prev = NULL; 653 } else { 654 tail = NULL; 655 } 656 return entry; 657 } 658 659 uint32_t count() const; 660 }; 661 662 /* Specifies which events are to be canceled and why. */ 663 struct CancelationOptions { 664 enum Mode { 665 CANCEL_ALL_EVENTS = 0, 666 CANCEL_POINTER_EVENTS = 1, 667 CANCEL_NON_POINTER_EVENTS = 2, 668 CANCEL_FALLBACK_EVENTS = 3, 669 }; 670 671 // The criterion to use to determine which events should be canceled. 672 Mode mode; 673 674 // Descriptive reason for the cancelation. 675 const char* reason; 676 677 // The specific keycode of the key event to cancel, or -1 to cancel any key event. 678 int32_t keyCode; 679 680 // The specific device id of events to cancel, or -1 to cancel events from any device. 681 int32_t deviceId; 682 683 CancelationOptions(Mode mode, const char* reason) : 684 mode(mode), reason(reason), keyCode(-1), deviceId(-1) { } 685 }; 686 687 /* Tracks dispatched key and motion event state so that cancelation events can be 688 * synthesized when events are dropped. */ 689 class InputState { 690 public: 691 InputState(); 692 ~InputState(); 693 694 // Returns true if there is no state to be canceled. 695 bool isNeutral() const; 696 697 // Returns true if the specified source is known to have received a hover enter 698 // motion event. 699 bool isHovering(int32_t deviceId, uint32_t source) const; 700 701 // Records tracking information for a key event that has just been published. 702 // Returns true if the event should be delivered, false if it is inconsistent 703 // and should be skipped. 704 bool trackKey(const KeyEntry* entry, int32_t action, int32_t flags); 705 706 // Records tracking information for a motion event that has just been published. 707 // Returns true if the event should be delivered, false if it is inconsistent 708 // and should be skipped. 709 bool trackMotion(const MotionEntry* entry, int32_t action, int32_t flags); 710 711 // Synthesizes cancelation events for the current state and resets the tracked state. 712 void synthesizeCancelationEvents(nsecs_t currentTime, 713 Vector<EventEntry*>& outEvents, const CancelationOptions& options); 714 715 // Clears the current state. 716 void clear(); 717 718 // Copies pointer-related parts of the input state to another instance. 719 void copyPointerStateTo(InputState& other) const; 720 721 // Gets the fallback key associated with a keycode. 722 // Returns -1 if none. 723 // Returns AKEYCODE_UNKNOWN if we are only dispatching the unhandled key to the policy. 724 int32_t getFallbackKey(int32_t originalKeyCode); 725 726 // Sets the fallback key for a particular keycode. 727 void setFallbackKey(int32_t originalKeyCode, int32_t fallbackKeyCode); 728 729 // Removes the fallback key for a particular keycode. 730 void removeFallbackKey(int32_t originalKeyCode); 731 732 inline const KeyedVector<int32_t, int32_t>& getFallbackKeys() const { 733 return mFallbackKeys; 734 } 735 736 private: 737 struct KeyMemento { 738 int32_t deviceId; 739 uint32_t source; 740 int32_t keyCode; 741 int32_t scanCode; 742 int32_t metaState; 743 int32_t flags; 744 nsecs_t downTime; 745 uint32_t policyFlags; 746 }; 747 748 struct MotionMemento { 749 int32_t deviceId; 750 uint32_t source; 751 int32_t flags; 752 float xPrecision; 753 float yPrecision; 754 nsecs_t downTime; 755 uint32_t pointerCount; 756 PointerProperties pointerProperties[MAX_POINTERS]; 757 PointerCoords pointerCoords[MAX_POINTERS]; 758 bool hovering; 759 uint32_t policyFlags; 760 761 void setPointers(const MotionEntry* entry); 762 }; 763 764 Vector<KeyMemento> mKeyMementos; 765 Vector<MotionMemento> mMotionMementos; 766 KeyedVector<int32_t, int32_t> mFallbackKeys; 767 768 ssize_t findKeyMemento(const KeyEntry* entry) const; 769 ssize_t findMotionMemento(const MotionEntry* entry, bool hovering) const; 770 771 void addKeyMemento(const KeyEntry* entry, int32_t flags); 772 void addMotionMemento(const MotionEntry* entry, int32_t flags, bool hovering); 773 774 static bool shouldCancelKey(const KeyMemento& memento, 775 const CancelationOptions& options); 776 static bool shouldCancelMotion(const MotionMemento& memento, 777 const CancelationOptions& options); 778 }; 779 780 /* Manages the dispatch state associated with a single input channel. */ 781 class Connection : public RefBase { 782 protected: 783 virtual ~Connection(); 784 785 public: 786 enum Status { 787 // Everything is peachy. 788 STATUS_NORMAL, 789 // An unrecoverable communication error has occurred. 790 STATUS_BROKEN, 791 // The input channel has been unregistered. 792 STATUS_ZOMBIE 793 }; 794 795 Status status; 796 sp<InputChannel> inputChannel; // never null 797 sp<InputWindowHandle> inputWindowHandle; // may be null 798 bool monitor; 799 InputPublisher inputPublisher; 800 InputState inputState; 801 802 // True if the socket is full and no further events can be published until 803 // the application consumes some of the input. 804 bool inputPublisherBlocked; 805 806 // Queue of events that need to be published to the connection. 807 Queue<DispatchEntry> outboundQueue; 808 809 // Queue of events that have been published to the connection but that have not 810 // yet received a "finished" response from the application. 811 Queue<DispatchEntry> waitQueue; 812 813 explicit Connection(const sp<InputChannel>& inputChannel, 814 const sp<InputWindowHandle>& inputWindowHandle, bool monitor); 815 816 inline const char* getInputChannelName() const { return inputChannel->getName().string(); } 817 818 const char* getWindowName() const; 819 const char* getStatusLabel() const; 820 821 DispatchEntry* findWaitQueueEntry(uint32_t seq); 822 }; 823 824 enum DropReason { 825 DROP_REASON_NOT_DROPPED = 0, 826 DROP_REASON_POLICY = 1, 827 DROP_REASON_APP_SWITCH = 2, 828 DROP_REASON_DISABLED = 3, 829 DROP_REASON_BLOCKED = 4, 830 DROP_REASON_STALE = 5, 831 }; 832 833 sp<InputDispatcherPolicyInterface> mPolicy; 834 InputDispatcherConfiguration mConfig; 835 836 Mutex mLock; 837 838 Condition mDispatcherIsAliveCondition; 839 840 sp<Looper> mLooper; 841 842 EventEntry* mPendingEvent; 843 Queue<EventEntry> mInboundQueue; 844 Queue<CommandEntry> mCommandQueue; 845 846 void dispatchOnceInnerLocked(nsecs_t* nextWakeupTime); 847 848 // Enqueues an inbound event. Returns true if mLooper->wake() should be called. 849 bool enqueueInboundEventLocked(EventEntry* entry); 850 851 // Cleans up input state when dropping an inbound event. 852 void dropInboundEventLocked(EventEntry* entry, DropReason dropReason); 853 854 // App switch latency optimization. 855 bool mAppSwitchSawKeyDown; 856 nsecs_t mAppSwitchDueTime; 857 858 static bool isAppSwitchKeyCode(int32_t keyCode); 859 bool isAppSwitchKeyEventLocked(KeyEntry* keyEntry); 860 bool isAppSwitchPendingLocked(); 861 void resetPendingAppSwitchLocked(bool handled); 862 863 // Stale event latency optimization. 864 static bool isStaleEventLocked(nsecs_t currentTime, EventEntry* entry); 865 866 // Blocked event latency optimization. Drops old events when the user intends 867 // to transfer focus to a new application. 868 EventEntry* mNextUnblockedEvent; 869 870 sp<InputWindowHandle> findTouchedWindowAtLocked(int32_t x, int32_t y); 871 872 // All registered connections mapped by channel file descriptor. 873 KeyedVector<int, sp<Connection> > mConnectionsByFd; 874 875 ssize_t getConnectionIndexLocked(const sp<InputChannel>& inputChannel); 876 877 // Input channels that will receive a copy of all input events. 878 Vector<sp<InputChannel> > mMonitoringChannels; 879 880 // Event injection and synchronization. 881 Condition mInjectionResultAvailableCondition; 882 bool hasInjectionPermission(int32_t injectorPid, int32_t injectorUid); 883 void setInjectionResultLocked(EventEntry* entry, int32_t injectionResult); 884 885 Condition mInjectionSyncFinishedCondition; 886 void incrementPendingForegroundDispatchesLocked(EventEntry* entry); 887 void decrementPendingForegroundDispatchesLocked(EventEntry* entry); 888 889 // Key repeat tracking. 890 struct KeyRepeatState { 891 KeyEntry* lastKeyEntry; // or null if no repeat 892 nsecs_t nextRepeatTime; 893 } mKeyRepeatState; 894 895 void resetKeyRepeatLocked(); 896 KeyEntry* synthesizeKeyRepeatLocked(nsecs_t currentTime); 897 898 // Deferred command processing. 899 bool runCommandsLockedInterruptible(); 900 CommandEntry* postCommandLocked(Command command); 901 902 // Inbound event processing. 903 void drainInboundQueueLocked(); 904 void releasePendingEventLocked(); 905 void releaseInboundEventLocked(EventEntry* entry); 906 907 // Dispatch state. 908 bool mDispatchEnabled; 909 bool mDispatchFrozen; 910 bool mInputFilterEnabled; 911 912 Vector<sp<InputWindowHandle> > mWindowHandles; 913 914 sp<InputWindowHandle> getWindowHandleLocked(const sp<InputChannel>& inputChannel) const; 915 bool hasWindowHandleLocked(const sp<InputWindowHandle>& windowHandle) const; 916 917 // Focus tracking for keys, trackball, etc. 918 sp<InputWindowHandle> mFocusedWindowHandle; 919 920 // Focus tracking for touch. 921 struct TouchedWindow { 922 sp<InputWindowHandle> windowHandle; 923 int32_t targetFlags; 924 BitSet32 pointerIds; // zero unless target flag FLAG_SPLIT is set 925 }; 926 struct TouchState { 927 bool down; 928 bool split; 929 int32_t deviceId; // id of the device that is currently down, others are rejected 930 uint32_t source; // source of the device that is current down, others are rejected 931 Vector<TouchedWindow> windows; 932 933 TouchState(); 934 ~TouchState(); 935 void reset(); 936 void copyFrom(const TouchState& other); 937 void addOrUpdateWindow(const sp<InputWindowHandle>& windowHandle, 938 int32_t targetFlags, BitSet32 pointerIds); 939 void removeWindow(const sp<InputWindowHandle>& windowHandle); 940 void filterNonAsIsTouchWindows(); 941 sp<InputWindowHandle> getFirstForegroundWindowHandle() const; 942 bool isSlippery() const; 943 }; 944 945 TouchState mTouchState; 946 TouchState mTempTouchState; 947 948 // Focused application. 949 sp<InputApplicationHandle> mFocusedApplicationHandle; 950 951 // Dispatch inbound events. 952 bool dispatchConfigurationChangedLocked( 953 nsecs_t currentTime, ConfigurationChangedEntry* entry); 954 bool dispatchDeviceResetLocked( 955 nsecs_t currentTime, DeviceResetEntry* entry); 956 bool dispatchKeyLocked( 957 nsecs_t currentTime, KeyEntry* entry, 958 DropReason* dropReason, nsecs_t* nextWakeupTime); 959 bool dispatchMotionLocked( 960 nsecs_t currentTime, MotionEntry* entry, 961 DropReason* dropReason, nsecs_t* nextWakeupTime); 962 void dispatchEventLocked(nsecs_t currentTime, EventEntry* entry, 963 const Vector<InputTarget>& inputTargets); 964 965 void logOutboundKeyDetailsLocked(const char* prefix, const KeyEntry* entry); 966 void logOutboundMotionDetailsLocked(const char* prefix, const MotionEntry* entry); 967 968 // Keeping track of ANR timeouts. 969 enum InputTargetWaitCause { 970 INPUT_TARGET_WAIT_CAUSE_NONE, 971 INPUT_TARGET_WAIT_CAUSE_SYSTEM_NOT_READY, 972 INPUT_TARGET_WAIT_CAUSE_APPLICATION_NOT_READY, 973 }; 974 975 InputTargetWaitCause mInputTargetWaitCause; 976 nsecs_t mInputTargetWaitStartTime; 977 nsecs_t mInputTargetWaitTimeoutTime; 978 bool mInputTargetWaitTimeoutExpired; 979 sp<InputApplicationHandle> mInputTargetWaitApplicationHandle; 980 981 // Contains the last window which received a hover event. 982 sp<InputWindowHandle> mLastHoverWindowHandle; 983 984 // Finding targets for input events. 985 int32_t handleTargetsNotReadyLocked(nsecs_t currentTime, const EventEntry* entry, 986 const sp<InputApplicationHandle>& applicationHandle, 987 const sp<InputWindowHandle>& windowHandle, 988 nsecs_t* nextWakeupTime, const char* reason); 989 void resumeAfterTargetsNotReadyTimeoutLocked(nsecs_t newTimeout, 990 const sp<InputChannel>& inputChannel); 991 nsecs_t getTimeSpentWaitingForApplicationLocked(nsecs_t currentTime); 992 void resetANRTimeoutsLocked(); 993 994 int32_t findFocusedWindowTargetsLocked(nsecs_t currentTime, const EventEntry* entry, 995 Vector<InputTarget>& inputTargets, nsecs_t* nextWakeupTime); 996 int32_t findTouchedWindowTargetsLocked(nsecs_t currentTime, const MotionEntry* entry, 997 Vector<InputTarget>& inputTargets, nsecs_t* nextWakeupTime, 998 bool* outConflictingPointerActions); 999 1000 void addWindowTargetLocked(const sp<InputWindowHandle>& windowHandle, 1001 int32_t targetFlags, BitSet32 pointerIds, Vector<InputTarget>& inputTargets); 1002 void addMonitoringTargetsLocked(Vector<InputTarget>& inputTargets); 1003 1004 void pokeUserActivityLocked(const EventEntry* eventEntry); 1005 bool checkInjectionPermission(const sp<InputWindowHandle>& windowHandle, 1006 const InjectionState* injectionState); 1007 bool isWindowObscuredAtPointLocked(const sp<InputWindowHandle>& windowHandle, 1008 int32_t x, int32_t y) const; 1009 bool isWindowReadyForMoreInputLocked(nsecs_t currentTime, 1010 const sp<InputWindowHandle>& windowHandle, const EventEntry* eventEntry); 1011 String8 getApplicationWindowLabelLocked(const sp<InputApplicationHandle>& applicationHandle, 1012 const sp<InputWindowHandle>& windowHandle); 1013 1014 // Manage the dispatch cycle for a single connection. 1015 // These methods are deliberately not Interruptible because doing all of the work 1016 // with the mutex held makes it easier to ensure that connection invariants are maintained. 1017 // If needed, the methods post commands to run later once the critical bits are done. 1018 void prepareDispatchCycleLocked(nsecs_t currentTime, const sp<Connection>& connection, 1019 EventEntry* eventEntry, const InputTarget* inputTarget); 1020 void enqueueDispatchEntriesLocked(nsecs_t currentTime, const sp<Connection>& connection, 1021 EventEntry* eventEntry, const InputTarget* inputTarget); 1022 void enqueueDispatchEntryLocked(const sp<Connection>& connection, 1023 EventEntry* eventEntry, const InputTarget* inputTarget, int32_t dispatchMode); 1024 void startDispatchCycleLocked(nsecs_t currentTime, const sp<Connection>& connection); 1025 void finishDispatchCycleLocked(nsecs_t currentTime, const sp<Connection>& connection, 1026 uint32_t seq, bool handled); 1027 void abortBrokenDispatchCycleLocked(nsecs_t currentTime, const sp<Connection>& connection, 1028 bool notify); 1029 void drainDispatchQueueLocked(Queue<DispatchEntry>* queue); 1030 void releaseDispatchEntryLocked(DispatchEntry* dispatchEntry); 1031 static int handleReceiveCallback(int fd, int events, void* data); 1032 1033 void synthesizeCancelationEventsForAllConnectionsLocked( 1034 const CancelationOptions& options); 1035 void synthesizeCancelationEventsForInputChannelLocked(const sp<InputChannel>& channel, 1036 const CancelationOptions& options); 1037 void synthesizeCancelationEventsForConnectionLocked(const sp<Connection>& connection, 1038 const CancelationOptions& options); 1039 1040 // Splitting motion events across windows. 1041 MotionEntry* splitMotionEvent(const MotionEntry* originalMotionEntry, BitSet32 pointerIds); 1042 1043 // Reset and drop everything the dispatcher is doing. 1044 void resetAndDropEverythingLocked(const char* reason); 1045 1046 // Dump state. 1047 void dumpDispatchStateLocked(String8& dump); 1048 void logDispatchStateLocked(); 1049 1050 // Registration. 1051 void removeMonitorChannelLocked(const sp<InputChannel>& inputChannel); 1052 status_t unregisterInputChannelLocked(const sp<InputChannel>& inputChannel, bool notify); 1053 1054 // Add or remove a connection to the mActiveConnections vector. 1055 void activateConnectionLocked(Connection* connection); 1056 void deactivateConnectionLocked(Connection* connection); 1057 1058 // Interesting events that we might like to log or tell the framework about. 1059 void onDispatchCycleFinishedLocked( 1060 nsecs_t currentTime, const sp<Connection>& connection, uint32_t seq, bool handled); 1061 void onDispatchCycleBrokenLocked( 1062 nsecs_t currentTime, const sp<Connection>& connection); 1063 void onANRLocked( 1064 nsecs_t currentTime, const sp<InputApplicationHandle>& applicationHandle, 1065 const sp<InputWindowHandle>& windowHandle, 1066 nsecs_t eventTime, nsecs_t waitStartTime, const char* reason); 1067 1068 // Outbound policy interactions. 1069 void doNotifyConfigurationChangedInterruptible(CommandEntry* commandEntry); 1070 void doNotifyInputChannelBrokenLockedInterruptible(CommandEntry* commandEntry); 1071 void doNotifyANRLockedInterruptible(CommandEntry* commandEntry); 1072 void doInterceptKeyBeforeDispatchingLockedInterruptible(CommandEntry* commandEntry); 1073 void doDispatchCycleFinishedLockedInterruptible(CommandEntry* commandEntry); 1074 bool afterKeyEventLockedInterruptible(const sp<Connection>& connection, 1075 DispatchEntry* dispatchEntry, KeyEntry* keyEntry, bool handled); 1076 bool afterMotionEventLockedInterruptible(const sp<Connection>& connection, 1077 DispatchEntry* dispatchEntry, MotionEntry* motionEntry, bool handled); 1078 void doPokeUserActivityLockedInterruptible(CommandEntry* commandEntry); 1079 void initializeKeyEvent(KeyEvent* event, const KeyEntry* entry); 1080 1081 // Statistics gathering. 1082 void updateDispatchStatisticsLocked(nsecs_t currentTime, const EventEntry* entry, 1083 int32_t injectionResult, nsecs_t timeSpentWaitingForApplication); 1084 void traceInboundQueueLengthLocked(); 1085 void traceOutboundQueueLengthLocked(const sp<Connection>& connection); 1086 void traceWaitQueueLengthLocked(const sp<Connection>& connection); 1087}; 1088 1089/* Enqueues and dispatches input events, endlessly. */ 1090class InputDispatcherThread : public Thread { 1091public: 1092 explicit InputDispatcherThread(const sp<InputDispatcherInterface>& dispatcher); 1093 ~InputDispatcherThread(); 1094 1095private: 1096 virtual bool threadLoop(); 1097 1098 sp<InputDispatcherInterface> mDispatcher; 1099}; 1100 1101} // namespace android 1102 1103#endif // _UI_INPUT_DISPATCHER_H 1104