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/*
* 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