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Diffstat (limited to 'native/include/android/input.h')
| -rw-r--r-- | native/include/android/input.h | 688 |
1 files changed, 688 insertions, 0 deletions
diff --git a/native/include/android/input.h b/native/include/android/input.h new file mode 100644 index 000000000000..9da122b6f842 --- /dev/null +++ b/native/include/android/input.h @@ -0,0 +1,688 @@ +/* + * 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 _ANDROID_INPUT_H +#define _ANDROID_INPUT_H + +/****************************************************************** + * + * IMPORTANT NOTICE: + * + * This file is part of Android's set of stable system headers + * exposed by the Android NDK (Native Development Kit). + * + * Third-party source AND binary code relies on the definitions + * here to be FROZEN ON ALL UPCOMING PLATFORM RELEASES. + * + * - DO NOT MODIFY ENUMS (EXCEPT IF YOU ADD NEW 32-BIT VALUES) + * - DO NOT MODIFY CONSTANTS OR FUNCTIONAL MACROS + * - DO NOT CHANGE THE SIGNATURE OF FUNCTIONS IN ANY WAY + * - DO NOT CHANGE THE LAYOUT OR SIZE OF STRUCTURES + */ + +/* + * Structures and functions to receive and process input events in + * native code. + * + * NOTE: These functions MUST be implemented by /system/lib/libui.so + */ + +#include <stdint.h> +#include <sys/types.h> +#include <android/keycodes.h> +#include <android/looper.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * Key states (may be returned by queries about the current state of a + * particular key code, scan code or switch). + */ +enum { + /* The key state is unknown or the requested key itself is not supported. */ + AKEY_STATE_UNKNOWN = -1, + + /* The key is up. */ + AKEY_STATE_UP = 0, + + /* The key is down. */ + AKEY_STATE_DOWN = 1, + + /* The key is down but is a virtual key press that is being emulated by the system. */ + AKEY_STATE_VIRTUAL = 2 +}; + +/* + * Meta key / modifer state. + */ +enum { + /* No meta keys are pressed. */ + AMETA_NONE = 0, + + /* This mask is used to check whether one of the ALT meta keys is pressed. */ + AMETA_ALT_ON = 0x02, + + /* This mask is used to check whether the left ALT meta key is pressed. */ + AMETA_ALT_LEFT_ON = 0x10, + + /* This mask is used to check whether the right ALT meta key is pressed. */ + AMETA_ALT_RIGHT_ON = 0x20, + + /* This mask is used to check whether one of the SHIFT meta keys is pressed. */ + AMETA_SHIFT_ON = 0x01, + + /* This mask is used to check whether the left SHIFT meta key is pressed. */ + AMETA_SHIFT_LEFT_ON = 0x40, + + /* This mask is used to check whether the right SHIFT meta key is pressed. */ + AMETA_SHIFT_RIGHT_ON = 0x80, + + /* This mask is used to check whether the SYM meta key is pressed. */ + AMETA_SYM_ON = 0x04 +}; + +/* + * Input events. + * + * Input events are opaque structures. Use the provided accessors functions to + * read their properties. + */ +struct AInputEvent; +typedef struct AInputEvent AInputEvent; + +/* + * Input event types. + */ +enum { + /* Indicates that the input event is a key event. */ + AINPUT_EVENT_TYPE_KEY = 1, + + /* Indicates that the input event is a motion event. */ + AINPUT_EVENT_TYPE_MOTION = 2 +}; + +/* + * Key event actions. + */ +enum { + /* The key has been pressed down. */ + AKEY_EVENT_ACTION_DOWN = 0, + + /* The key has been released. */ + AKEY_EVENT_ACTION_UP = 1, + + /* Multiple duplicate key events have occurred in a row, or a complex string is + * being delivered. The repeat_count property of the key event contains the number + * of times the given key code should be executed. + */ + AKEY_EVENT_ACTION_MULTIPLE = 2 +}; + +/* + * Key event flags. + */ +enum { + /* This mask is set if the device woke because of this key event. */ + AKEY_EVENT_FLAG_WOKE_HERE = 0x1, + + /* This mask is set if the key event was generated by a software keyboard. */ + AKEY_EVENT_FLAG_SOFT_KEYBOARD = 0x2, + + /* This mask is set if we don't want the key event to cause us to leave touch mode. */ + AKEY_EVENT_FLAG_KEEP_TOUCH_MODE = 0x4, + + /* This mask is set if an event was known to come from a trusted part + * of the system. That is, the event is known to come from the user, + * and could not have been spoofed by a third party component. */ + AKEY_EVENT_FLAG_FROM_SYSTEM = 0x8, + + /* This mask is used for compatibility, to identify enter keys that are + * coming from an IME whose enter key has been auto-labelled "next" or + * "done". This allows TextView to dispatch these as normal enter keys + * for old applications, but still do the appropriate action when + * receiving them. */ + AKEY_EVENT_FLAG_EDITOR_ACTION = 0x10, + + /* When associated with up key events, this indicates that the key press + * has been canceled. Typically this is used with virtual touch screen + * keys, where the user can slide from the virtual key area on to the + * display: in that case, the application will receive a canceled up + * event and should not perform the action normally associated with the + * key. Note that for this to work, the application can not perform an + * action for a key until it receives an up or the long press timeout has + * expired. */ + AKEY_EVENT_FLAG_CANCELED = 0x20, + + /* This key event was generated by a virtual (on-screen) hard key area. + * Typically this is an area of the touchscreen, outside of the regular + * display, dedicated to "hardware" buttons. */ + AKEY_EVENT_FLAG_VIRTUAL_HARD_KEY = 0x40, + + /* This flag is set for the first key repeat that occurs after the + * long press timeout. */ + AKEY_EVENT_FLAG_LONG_PRESS = 0x80, + + /* Set when a key event has AKEY_EVENT_FLAG_CANCELED set because a long + * press action was executed while it was down. */ + AKEY_EVENT_FLAG_CANCELED_LONG_PRESS = 0x100, + + /* Set for AKEY_EVENT_ACTION_UP when this event's key code is still being + * tracked from its initial down. That is, somebody requested that tracking + * started on the key down and a long press has not caused + * the tracking to be canceled. */ + AKEY_EVENT_FLAG_TRACKING = 0x200 +}; + +/* + * Motion event actions. + */ + +/* Bit shift for the action bits holding the pointer index as + * defined by AMOTION_EVENT_ACTION_POINTER_INDEX_MASK. + */ +#define AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT 8 + +enum { + /* Bit mask of the parts of the action code that are the action itself. + */ + AMOTION_EVENT_ACTION_MASK = 0xff, + + /* Bits in the action code that represent a pointer index, used with + * AMOTION_EVENT_ACTION_POINTER_DOWN and AMOTION_EVENT_ACTION_POINTER_UP. Shifting + * down by AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT provides the actual pointer + * index where the data for the pointer going up or down can be found. + */ + AMOTION_EVENT_ACTION_POINTER_INDEX_MASK = 0xff00, + + /* A pressed gesture has started, the motion contains the initial starting location. + */ + AMOTION_EVENT_ACTION_DOWN = 0, + + /* A pressed gesture has finished, the motion contains the final release location + * as well as any intermediate points since the last down or move event. + */ + AMOTION_EVENT_ACTION_UP = 1, + + /* A change has happened during a press gesture (between AMOTION_EVENT_ACTION_DOWN and + * AMOTION_EVENT_ACTION_UP). The motion contains the most recent point, as well as + * any intermediate points since the last down or move event. + */ + AMOTION_EVENT_ACTION_MOVE = 2, + + /* The current gesture has been aborted. + * You will not receive any more points in it. You should treat this as + * an up event, but not perform any action that you normally would. + */ + AMOTION_EVENT_ACTION_CANCEL = 3, + + /* A movement has happened outside of the normal bounds of the UI element. + * This does not provide a full gesture, but only the initial location of the movement/touch. + */ + AMOTION_EVENT_ACTION_OUTSIDE = 4, + + /* A non-primary pointer has gone down. + * The bits in AMOTION_EVENT_ACTION_POINTER_INDEX_MASK indicate which pointer changed. + */ + AMOTION_EVENT_ACTION_POINTER_DOWN = 5, + + /* A non-primary pointer has gone up. + * The bits in AMOTION_EVENT_ACTION_POINTER_INDEX_MASK indicate which pointer changed. + */ + AMOTION_EVENT_ACTION_POINTER_UP = 6 +}; + +/* + * Motion event flags. + */ +enum { + /* This flag indicates that the window that received this motion event is partly + * or wholly obscured by another visible window above it. This flag is set to true + * even if the event did not directly pass through the obscured area. + * A security sensitive application can check this flag to identify situations in which + * a malicious application may have covered up part of its content for the purpose + * of misleading the user or hijacking touches. An appropriate response might be + * to drop the suspect touches or to take additional precautions to confirm the user's + * actual intent. + */ + AMOTION_EVENT_FLAG_WINDOW_IS_OBSCURED = 0x1, +}; + +/* + * Motion event edge touch flags. + */ +enum { + /* No edges intersected */ + AMOTION_EVENT_EDGE_FLAG_NONE = 0, + + /* Flag indicating the motion event intersected the top edge of the screen. */ + AMOTION_EVENT_EDGE_FLAG_TOP = 0x01, + + /* Flag indicating the motion event intersected the bottom edge of the screen. */ + AMOTION_EVENT_EDGE_FLAG_BOTTOM = 0x02, + + /* Flag indicating the motion event intersected the left edge of the screen. */ + AMOTION_EVENT_EDGE_FLAG_LEFT = 0x04, + + /* Flag indicating the motion event intersected the right edge of the screen. */ + AMOTION_EVENT_EDGE_FLAG_RIGHT = 0x08 +}; + +/* + * Input sources. + * + * Refer to the documentation on android.view.InputDevice for more details about input sources + * and their correct interpretation. + */ +enum { + AINPUT_SOURCE_CLASS_MASK = 0x000000ff, + + AINPUT_SOURCE_CLASS_BUTTON = 0x00000001, + AINPUT_SOURCE_CLASS_POINTER = 0x00000002, + AINPUT_SOURCE_CLASS_NAVIGATION = 0x00000004, + AINPUT_SOURCE_CLASS_POSITION = 0x00000008, + AINPUT_SOURCE_CLASS_JOYSTICK = 0x00000010, +}; + +enum { + AINPUT_SOURCE_UNKNOWN = 0x00000000, + + AINPUT_SOURCE_KEYBOARD = 0x00000100 | AINPUT_SOURCE_CLASS_BUTTON, + AINPUT_SOURCE_DPAD = 0x00000200 | AINPUT_SOURCE_CLASS_BUTTON, + AINPUT_SOURCE_GAMEPAD = 0x00000400 | AINPUT_SOURCE_CLASS_BUTTON, + AINPUT_SOURCE_TOUCHSCREEN = 0x00001000 | AINPUT_SOURCE_CLASS_POINTER, + AINPUT_SOURCE_MOUSE = 0x00002000 | AINPUT_SOURCE_CLASS_POINTER, + AINPUT_SOURCE_TRACKBALL = 0x00010000 | AINPUT_SOURCE_CLASS_NAVIGATION, + AINPUT_SOURCE_TOUCHPAD = 0x00100000 | AINPUT_SOURCE_CLASS_POSITION, + AINPUT_SOURCE_JOYSTICK_LEFT = 0x01000000 | AINPUT_SOURCE_CLASS_JOYSTICK, + AINPUT_SOURCE_JOYSTICK_RIGHT = 0x02000000 | AINPUT_SOURCE_CLASS_JOYSTICK, +}; + +/* + * Keyboard types. + * + * Refer to the documentation on android.view.InputDevice for more details. + */ +enum { + AINPUT_KEYBOARD_TYPE_NONE = 0, + AINPUT_KEYBOARD_TYPE_NON_ALPHABETIC = 1, + AINPUT_KEYBOARD_TYPE_ALPHABETIC = 2, +}; + +/* + * Constants used to retrieve information about the range of motion for a particular + * coordinate of a motion event. + * + * Refer to the documentation on android.view.InputDevice for more details about input sources + * and their correct interpretation. + */ +enum { + AINPUT_MOTION_RANGE_X = 0, + AINPUT_MOTION_RANGE_Y = 1, + AINPUT_MOTION_RANGE_PRESSURE = 2, + AINPUT_MOTION_RANGE_SIZE = 3, + AINPUT_MOTION_RANGE_TOUCH_MAJOR = 4, + AINPUT_MOTION_RANGE_TOUCH_MINOR = 5, + AINPUT_MOTION_RANGE_TOOL_MAJOR = 6, + AINPUT_MOTION_RANGE_TOOL_MINOR = 7, + AINPUT_MOTION_RANGE_ORIENTATION = 8, +}; + + +/* + * Input event accessors. + * + * Note that most functions can only be used on input events that are of a given type. + * Calling these functions on input events of other types will yield undefined behavior. + */ + +/*** Accessors for all input events. ***/ + +/* Get the input event type. */ +int32_t AInputEvent_getType(const AInputEvent* event); + +/* Get the id for the device that an input event came from. + * + * Input events can be generated by multiple different input devices. + * Use the input device id to obtain information about the input + * device that was responsible for generating a particular event. + * + * An input device id of 0 indicates that the event didn't come from a physical device; + * other numbers are arbitrary and you shouldn't depend on the values. + * Use the provided input device query API to obtain information about input devices. + */ +int32_t AInputEvent_getDeviceId(const AInputEvent* event); + +/* Get the input event source. */ +int32_t AInputEvent_getSource(const AInputEvent* event); + +/*** Accessors for key events only. ***/ + +/* Get the key event action. */ +int32_t AKeyEvent_getAction(const AInputEvent* key_event); + +/* Get the key event flags. */ +int32_t AKeyEvent_getFlags(const AInputEvent* key_event); + +/* Get the key code of the key event. + * This is the physical key that was pressed, not the Unicode character. */ +int32_t AKeyEvent_getKeyCode(const AInputEvent* key_event); + +/* Get the hardware key id of this key event. + * These values are not reliable and vary from device to device. */ +int32_t AKeyEvent_getScanCode(const AInputEvent* key_event); + +/* Get the meta key state. */ +int32_t AKeyEvent_getMetaState(const AInputEvent* key_event); + +/* Get the repeat count of the event. + * For both key up an key down events, this is the number of times the key has + * repeated with the first down starting at 0 and counting up from there. For + * multiple key events, this is the number of down/up pairs that have occurred. */ +int32_t AKeyEvent_getRepeatCount(const AInputEvent* key_event); + +/* Get the time of the most recent key down event, in the + * java.lang.System.nanoTime() time base. If this is a down event, + * this will be the same as eventTime. + * Note that when chording keys, this value is the down time of the most recently + * pressed key, which may not be the same physical key of this event. */ +int64_t AKeyEvent_getDownTime(const AInputEvent* key_event); + +/* Get the time this event occurred, in the + * java.lang.System.nanoTime() time base. */ +int64_t AKeyEvent_getEventTime(const AInputEvent* key_event); + +/*** Accessors for motion events only. ***/ + +/* Get the combined motion event action code and pointer index. */ +int32_t AMotionEvent_getAction(const AInputEvent* motion_event); + +/* Get the motion event flags. */ +int32_t AMotionEvent_getFlags(const AInputEvent* motion_event); + +/* Get the state of any meta / modifier keys that were in effect when the + * event was generated. */ +int32_t AMotionEvent_getMetaState(const AInputEvent* motion_event); + +/* Get a bitfield indicating which edges, if any, were touched by this motion event. + * For touch events, clients can use this to determine if the user's finger was + * touching the edge of the display. */ +int32_t AMotionEvent_getEdgeFlags(const AInputEvent* motion_event); + +/* Get the time when the user originally pressed down to start a stream of + * position events, in the java.lang.System.nanoTime() time base. */ +int64_t AMotionEvent_getDownTime(const AInputEvent* motion_event); + +/* Get the time when this specific event was generated, + * in the java.lang.System.nanoTime() time base. */ +int64_t AMotionEvent_getEventTime(const AInputEvent* motion_event); + +/* Get the X coordinate offset. + * For touch events on the screen, this is the delta that was added to the raw + * screen coordinates to adjust for the absolute position of the containing windows + * and views. */ +float AMotionEvent_getXOffset(const AInputEvent* motion_event); + +/* Get the precision of the Y coordinates being reported. + * For touch events on the screen, this is the delta that was added to the raw + * screen coordinates to adjust for the absolute position of the containing windows + * and views. */ +float AMotionEvent_getYOffset(const AInputEvent* motion_event); + +/* Get the precision of the X coordinates being reported. + * You can multiply this number with an X coordinate sample to find the + * actual hardware value of the X coordinate. */ +float AMotionEvent_getXPrecision(const AInputEvent* motion_event); + +/* Get the precision of the Y coordinates being reported. + * You can multiply this number with a Y coordinate sample to find the + * actual hardware value of the Y coordinate. */ +float AMotionEvent_getYPrecision(const AInputEvent* motion_event); + +/* Get the number of pointers of data contained in this event. + * Always >= 1. */ +size_t AMotionEvent_getPointerCount(const AInputEvent* motion_event); + +/* Get the pointer identifier associated with a particular pointer + * data index is this event. The identifier tells you the actual pointer + * number associated with the data, accounting for individual pointers + * going up and down since the start of the current gesture. */ +int32_t AMotionEvent_getPointerId(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the original raw X coordinate of this event. + * For touch events on the screen, this is the original location of the event + * on the screen, before it had been adjusted for the containing window + * and views. */ +float AMotionEvent_getRawX(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the original raw X coordinate of this event. + * For touch events on the screen, this is the original location of the event + * on the screen, before it had been adjusted for the containing window + * and views. */ +float AMotionEvent_getRawY(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the current X coordinate of this event for the given pointer index. + * Whole numbers are pixels; the value may have a fraction for input devices + * that are sub-pixel precise. */ +float AMotionEvent_getX(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the current Y coordinate of this event for the given pointer index. + * Whole numbers are pixels; the value may have a fraction for input devices + * that are sub-pixel precise. */ +float AMotionEvent_getY(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the current pressure of this event for the given pointer index. + * The pressure generally ranges from 0 (no pressure at all) to 1 (normal pressure), + * however values higher than 1 may be generated depending on the calibration of + * the input device. */ +float AMotionEvent_getPressure(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the current scaled value of the approximate size for the given pointer index. + * This represents some approximation of the area of the screen being + * pressed; the actual value in pixels corresponding to the + * touch is normalized with the device specific range of values + * and scaled to a value between 0 and 1. The value of size can be used to + * determine fat touch events. */ +float AMotionEvent_getSize(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the current length of the major axis of an ellipse that describes the touch area + * at the point of contact for the given pointer index. */ +float AMotionEvent_getTouchMajor(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the current length of the minor axis of an ellipse that describes the touch area + * at the point of contact for the given pointer index. */ +float AMotionEvent_getTouchMinor(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the current length of the major axis of an ellipse that describes the size + * of the approaching tool for the given pointer index. + * The tool area represents the estimated size of the finger or pen that is + * touching the device independent of its actual touch area at the point of contact. */ +float AMotionEvent_getToolMajor(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the current length of the minor axis of an ellipse that describes the size + * of the approaching tool for the given pointer index. + * The tool area represents the estimated size of the finger or pen that is + * touching the device independent of its actual touch area at the point of contact. */ +float AMotionEvent_getToolMinor(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the current orientation of the touch area and tool area in radians clockwise from + * vertical for the given pointer index. + * An angle of 0 degrees indicates that the major axis of contact is oriented + * upwards, is perfectly circular or is of unknown orientation. A positive angle + * indicates that the major axis of contact is oriented to the right. A negative angle + * indicates that the major axis of contact is oriented to the left. + * The full range is from -PI/2 radians (finger pointing fully left) to PI/2 radians + * (finger pointing fully right). */ +float AMotionEvent_getOrientation(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the number of historical points in this event. These are movements that + * have occurred between this event and the previous event. This only applies + * to AMOTION_EVENT_ACTION_MOVE events -- all other actions will have a size of 0. + * Historical samples are indexed from oldest to newest. */ +size_t AMotionEvent_getHistorySize(const AInputEvent* motion_event); + +/* Get the time that a historical movement occurred between this event and + * the previous event, in the java.lang.System.nanoTime() time base. */ +int64_t AMotionEvent_getHistoricalEventTime(AInputEvent* motion_event, + size_t history_index); + +/* Get the historical raw X coordinate of this event for the given pointer index that + * occurred between this event and the previous motion event. + * For touch events on the screen, this is the original location of the event + * on the screen, before it had been adjusted for the containing window + * and views. + * Whole numbers are pixels; the value may have a fraction for input devices + * that are sub-pixel precise. */ +float AMotionEvent_getHistoricalRawX(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the historical raw Y coordinate of this event for the given pointer index that + * occurred between this event and the previous motion event. + * For touch events on the screen, this is the original location of the event + * on the screen, before it had been adjusted for the containing window + * and views. + * Whole numbers are pixels; the value may have a fraction for input devices + * that are sub-pixel precise. */ +float AMotionEvent_getHistoricalRawY(const AInputEvent* motion_event, size_t pointer_index); + +/* Get the historical X coordinate of this event for the given pointer index that + * occurred between this event and the previous motion event. + * Whole numbers are pixels; the value may have a fraction for input devices + * that are sub-pixel precise. */ +float AMotionEvent_getHistoricalX(AInputEvent* motion_event, size_t pointer_index, + size_t history_index); + +/* Get the historical Y coordinate of this event for the given pointer index that + * occurred between this event and the previous motion event. + * Whole numbers are pixels; the value may have a fraction for input devices + * that are sub-pixel precise. */ +float AMotionEvent_getHistoricalY(AInputEvent* motion_event, size_t pointer_index, + size_t history_index); + +/* Get the historical pressure of this event for the given pointer index that + * occurred between this event and the previous motion event. + * The pressure generally ranges from 0 (no pressure at all) to 1 (normal pressure), + * however values higher than 1 may be generated depending on the calibration of + * the input device. */ +float AMotionEvent_getHistoricalPressure(AInputEvent* motion_event, size_t pointer_index, + size_t history_index); + +/* Get the current scaled value of the approximate size for the given pointer index that + * occurred between this event and the previous motion event. + * This represents some approximation of the area of the screen being + * pressed; the actual value in pixels corresponding to the + * touch is normalized with the device specific range of values + * and scaled to a value between 0 and 1. The value of size can be used to + * determine fat touch events. */ +float AMotionEvent_getHistoricalSize(AInputEvent* motion_event, size_t pointer_index, + size_t history_index); + +/* Get the historical length of the major axis of an ellipse that describes the touch area + * at the point of contact for the given pointer index that + * occurred between this event and the previous motion event. */ +float AMotionEvent_getHistoricalTouchMajor(const AInputEvent* motion_event, size_t pointer_index, + size_t history_index); + +/* Get the historical length of the minor axis of an ellipse that describes the touch area + * at the point of contact for the given pointer index that + * occurred between this event and the previous motion event. */ +float AMotionEvent_getHistoricalTouchMinor(const AInputEvent* motion_event, size_t pointer_index, + size_t history_index); + +/* Get the historical length of the major axis of an ellipse that describes the size + * of the approaching tool for the given pointer index that + * occurred between this event and the previous motion event. + * The tool area represents the estimated size of the finger or pen that is + * touching the device independent of its actual touch area at the point of contact. */ +float AMotionEvent_getHistoricalToolMajor(const AInputEvent* motion_event, size_t pointer_index, + size_t history_index); + +/* Get the historical length of the minor axis of an ellipse that describes the size + * of the approaching tool for the given pointer index that + * occurred between this event and the previous motion event. + * The tool area represents the estimated size of the finger or pen that is + * touching the device independent of its actual touch area at the point of contact. */ +float AMotionEvent_getHistoricalToolMinor(const AInputEvent* motion_event, size_t pointer_index, + size_t history_index); + +/* Get the historical orientation of the touch area and tool area in radians clockwise from + * vertical for the given pointer index that + * occurred between this event and the previous motion event. + * An angle of 0 degrees indicates that the major axis of contact is oriented + * upwards, is perfectly circular or is of unknown orientation. A positive angle + * indicates that the major axis of contact is oriented to the right. A negative angle + * indicates that the major axis of contact is oriented to the left. + * The full range is from -PI/2 radians (finger pointing fully left) to PI/2 radians + * (finger pointing fully right). */ +float AMotionEvent_getHistoricalOrientation(const AInputEvent* motion_event, size_t pointer_index, + size_t history_index); + + +/* + * Input queue + * + * An input queue is the facility through which you retrieve input + * events. + */ +struct AInputQueue; +typedef struct AInputQueue AInputQueue; + +/* + * Add this input queue to a looper for processing. See + * ALooper_addFd() for information on the ident, callback, and data params. + */ +void AInputQueue_attachLooper(AInputQueue* queue, ALooper* looper, + int ident, ALooper_callbackFunc* callback, void* data); + +/* + * Remove the input queue from the looper it is currently attached to. + */ +void AInputQueue_detachLooper(AInputQueue* queue); + +/* + * Returns true if there are one or more events available in the + * input queue. Returns 1 if the queue has events; 0 if + * it does not have events; and a negative value if there is an error. + */ +int32_t AInputQueue_hasEvents(AInputQueue* queue); + +/* + * Returns the next available event from the queue. Returns a negative + * value if no events are available or an error has occurred. + */ +int32_t AInputQueue_getEvent(AInputQueue* queue, AInputEvent** outEvent); + +/* + * Sends the key for standard pre-dispatching -- that is, possibly deliver + * it to the current IME to be consumed before the app. Returns 0 if it + * was not pre-dispatched, meaning you can process it right now. If non-zero + * is returned, you must abandon the current event processing and allow the + * event to appear again in the event queue (if it does not get consumed during + * pre-dispatching). + */ +int32_t AInputQueue_preDispatchEvent(AInputQueue* queue, AInputEvent* event); + +/* + * Report that dispatching has finished with the given event. + * This must be called after receiving an event with AInputQueue_get_event(). + */ +void AInputQueue_finishEvent(AInputQueue* queue, AInputEvent* event, int handled); + +#ifdef __cplusplus +} +#endif + +#endif // _ANDROID_INPUT_H |