customdrawn/android/input.pas

(*
 * 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.
  *)

unit input;

interface

uses ctypes,looper,keycodes;

(******************************************************************
 *
 * 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
  *)

(*
 * Key states (may be returned by queries about the current state of a
 * particular key code, scan code or switch).
  *)
const
  (* 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.
  *)
const
  (* 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 = $02;
  (* This mask is used to check whether the left ALT meta key is pressed.  *)
  AMETA_ALT_LEFT_ON = $10;
  (* This mask is used to check whether the right ALT meta key is pressed.  *)
  AMETA_ALT_RIGHT_ON = $20;
  (* This mask is used to check whether one of the SHIFT meta keys is pressed.  *)
  AMETA_SHIFT_ON = $01;
  (* This mask is used to check whether the left SHIFT meta key is pressed.  *)
  AMETA_SHIFT_LEFT_ON = $40;
  (* This mask is used to check whether the right SHIFT meta key is pressed.  *)
  AMETA_SHIFT_RIGHT_ON = $80;
  (* This mask is used to check whether the SYM meta key is pressed.  *)
  AMETA_SYM_ON = $04;

(*
 * Input events.
 *
 * Input events are opaque structures.  Use the provided accessors functions to
 * read their properties.
  *)
type
  PPAInputEvent = ^PAInputEvent;
  PAInputEvent = ^AInputEvent;

  AInputEvent = record end;

(*
 * Input event types.
  *)
const
  (* 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.
  *)
const
  (* 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.
  *)
const
  (* This mask is set if the device woke because of this key event.  *)
  AKEY_EVENT_FLAG_WOKE_HERE = $1;
  (* This mask is set if the key event was generated by a software keyboard.  *)
  AKEY_EVENT_FLAG_SOFT_KEYBOARD = $2;
  (* 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 = $4;
  (* 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 = $8;
  (* 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 = $10;
  (* 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 = $20;
  (* 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 = $40;
  (* This flag is set for the first key repeat that occurs after the
     * long press timeout.  *)
  AKEY_EVENT_FLAG_LONG_PRESS = $80;
  (* 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 = $100;
  (* 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 = $200;


(*
 * Motion event actions.
  *)

(* Bit shift for the action bits holding the pointer index as
 * defined by AMOTION_EVENT_ACTION_POINTER_INDEX_MASK.
  *)
const
  AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT = 8;

const
  (* Bit mask of the parts of the action code that are the action itself.
      *)
  AMOTION_EVENT_ACTION_MASK = $ff;
  (* 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 = $ff00;
  (* 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.
  *)

const
  (* 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 = $1;

(*
 * Motion event edge touch flags.
  *)

const
  (* 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 = $01;
  (* Flag indicating the motion event intersected the bottom edge of the screen.  *)
  AMOTION_EVENT_EDGE_FLAG_BOTTOM = $02;
  (* Flag indicating the motion event intersected the left edge of the screen.  *)
  AMOTION_EVENT_EDGE_FLAG_LEFT = $04;
  (* Flag indicating the motion event intersected the right edge of the screen.  *)
  AMOTION_EVENT_EDGE_FLAG_RIGHT = $08;

(*
 * Input sources.
 *
 * Refer to the documentation on android.view.InputDevice for more details about input sources
 * and their correct interpretation.
  *)

const
  AINPUT_SOURCE_CLASS_MASK = $000000ff;
  AINPUT_SOURCE_CLASS_BUTTON = $00000001;
  AINPUT_SOURCE_CLASS_POINTER = $00000002;
  AINPUT_SOURCE_CLASS_NAVIGATION = $00000004;
  AINPUT_SOURCE_CLASS_POSITION = $00000008;

const
  AINPUT_SOURCE_UNKNOWN = $00000000;
  AINPUT_SOURCE_KEYBOARD = $00000100 or AINPUT_SOURCE_CLASS_BUTTON;
  AINPUT_SOURCE_DPAD = $00000200 or AINPUT_SOURCE_CLASS_BUTTON;
  AINPUT_SOURCE_TOUCHSCREEN = $00001000 or AINPUT_SOURCE_CLASS_POINTER;
  AINPUT_SOURCE_MOUSE = $00002000 or AINPUT_SOURCE_CLASS_POINTER;
  AINPUT_SOURCE_TRACKBALL = $00010000 or AINPUT_SOURCE_CLASS_NAVIGATION;
  AINPUT_SOURCE_TOUCHPAD = $00100000 or AINPUT_SOURCE_CLASS_POSITION;
  AINPUT_SOURCE_ANY = $ffffff00;

(*
 * Keyboard types.
 *
 * Refer to the documentation on android.view.InputDevice for more details.
  *)

const
  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.
  *)

const
  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.  *)
function AInputEvent_getType(event: PAInputEvent): cint32; cdecl; external;

(* 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.
  *)
function AInputEvent_getDeviceId(event: PAInputEvent): cint32; cdecl; external;

(* Get the input event source.  *)
function AInputEvent_getSource(event: PAInputEvent): cint32; cdecl; external;

(*** Accessors for key events only. ** *)

(* Get the key event action.  *)

function AKeyEvent_getAction(key_event: PAInputEvent): cint32; cdecl; external;

(* Get the key event flags.  *)

function AKeyEvent_getFlags(key_event: PAInputEvent): cint32; cdecl; external;

(* Get the key code of the key event.
 * This is the physical key that was pressed, not the Unicode character.  *)

function AKeyEvent_getKeyCode(key_event: PAInputEvent): cint32; cdecl; external;

(* Get the hardware key id of this key event.
 * These values are not reliable and vary from device to device.  *)

function AKeyEvent_getScanCode(key_event: PAInputEvent): cint32; cdecl; external;

(* Get the meta key state.  *)

function AKeyEvent_getMetaState(key_event: PAInputEvent): cint32; cdecl; external;

(* 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.  *)

function AKeyEvent_getRepeatCount(key_event: PAInputEvent): cint32; cdecl; external;

(* 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.  *)

function AKeyEvent_getDownTime(key_event: PAInputEvent): cint64; cdecl; external;

(* Get the time this event occurred, in the
 * java.lang.System.nanoTime() time base.  *)

function AKeyEvent_getEventTime(key_event: PAInputEvent): cint64; cdecl; external;

(*** Accessors for motion events only. ** *)

(* Get the combined motion event action code and pointer index.  *)

function AMotionEvent_getAction(motion_event: PAInputEvent): cint32; cdecl; external;

(* Get the motion event flags.  *)

function AMotionEvent_getFlags(motion_event: PAInputEvent): cint32; cdecl; external;

(* Get the state of any meta / modifier keys that were in effect when the
 * event was generated.  *)

function AMotionEvent_getMetaState(motion_event: PAInputEvent): cint32; cdecl; external;

(* 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.  *)

function AMotionEvent_getEdgeFlags(motion_event: PAInputEvent): cint32; cdecl; external;

(* Get the time when the user originally pressed down to start a stream of
 * position events, in the java.lang.System.nanoTime() time base.  *)

function AMotionEvent_getDownTime(motion_event: PAInputEvent): cint64; cdecl; external;

(* Get the time when this specific event was generated,
 * in the java.lang.System.nanoTime() time base.  *)

function AMotionEvent_getEventTime(motion_event: PAInputEvent): cint64; cdecl; external;

(* 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.  *)

function AMotionEvent_getXOffset(motion_event: PAInputEvent): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getYOffset(motion_event: PAInputEvent): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getXPrecision(motion_event: PAInputEvent): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getYPrecision(motion_event: PAInputEvent): cfloat; cdecl; external;

(* Get the number of pointers of data contained in this event.
 * Always >= 1.  *)

function AMotionEvent_getPointerCount(motion_event: PAInputEvent): csize_t; cdecl; external;

(* 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.  *)

function AMotionEvent_getPointerId(motion_event: PAInputEvent; pointer_index: csize_t): cint32; cdecl; external;

(* 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.  *)

function AMotionEvent_getRawX(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getRawY(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getX(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getY(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getPressure(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getSize(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getTouchMajor(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getTouchMinor(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getToolMajor(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getToolMinor(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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).  *)

function AMotionEvent_getOrientation(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getHistorySize(motion_event: PAInputEvent): csize_t; cdecl; external;

(* Get the time that a historical movement occurred between this event and
 * the previous event, in the java.lang.System.nanoTime() time base.  *)

function AMotionEvent_getHistoricalEventTime(motion_event: PAInputEvent; history_index: csize_t): cint64; cdecl; external;

(* 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.  *)

function AMotionEvent_getHistoricalRawX(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getHistoricalRawY(motion_event: PAInputEvent; pointer_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getHistoricalX(motion_event: PAInputEvent; pointer_index, history_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getHistoricalY(motion_event: PAInputEvent; pointer_index, history_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getHistoricalPressure(motion_event: PAInputEvent; pointer_index, history_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getHistoricalSize(motion_event: PAInputEvent; pointer_index, history_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getHistoricalTouchMajor(motion_event: PAInputEvent; pointer_index, history_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getHistoricalTouchMinor(motion_event: PAInputEvent; pointer_index, history_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getHistoricalToolMajor(motion_event: PAInputEvent; pointer_index, history_index: csize_t): cfloat; cdecl; external;

(* 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.  *)

function AMotionEvent_getHistoricalToolMinor(motion_event: PAInputEvent; pointer_index, history_index: csize_t): cfloat; cdecl; external;

(* 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).  *)

function AMotionEvent_getHistoricalOrientation(motion_event: PAInputEvent; pointer_index, history_index: csize_t): cfloat; cdecl; external;


(*
 * Input queue
 *
 * An input queue is the facility through which you retrieve input
 * events.
  *)

type
  PAInputQueue = ^AInputQueue;
  AInputQueue = record end;

  (*
 * Add this input queue to a looper for processing.  See
 * ALooper_addFd() for information on the ident, callback, and data params.
  *)
procedure AInputQueue_attachLooper(queue: PAInputQueue; looper: PALooper; ident: cint; callback: ALooper_callbackFunc; data: Pointer); cdecl; external;

(*
 * Remove the input queue from the looper it is currently attached to.
  *)

procedure AInputQueue_detachLooper(queue: PAInputQueue); cdecl; external;

(*
 * 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.
  *)

function AInputQueue_hasEvents(queue: PAInputQueue): cint32; cdecl; external;

(*
 * Returns the next available event from the queue.  Returns a negative
 * value if no events are available or an error has occurred.
  *)
function AInputQueue_getEvent(queue: PAInputQueue; outEvent: PPAInputEvent): cint32; cdecl; external;

(*
 * 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).
  *)
function AInputQueue_preDispatchEvent(queue: PAInputQueue; event: PAInputEvent): cint32; cdecl; external;

(*
 * Report that dispatching has finished with the given event.
 * This must be called after receiving an event with AInputQueue_get_event().
  *)

procedure AInputQueue_finishEvent(queue: PAInputQueue; event: PAInputEvent; handled: cint); cdecl; external;

implementation

end.