--- /dev/null
+/*
+ * 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,
+};
+
+enum {
+ AINPUT_SOURCE_UNKNOWN = 0x00000000,
+
+ AINPUT_SOURCE_KEYBOARD = 0x00000100 | AINPUT_SOURCE_CLASS_BUTTON,
+ AINPUT_SOURCE_DPAD = 0x00000200 | 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_ANY = 0xffffff00,
+};
+
+/*
+ * 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
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