// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#ifndef PUBLIC_FPDF_FORMFILL_H_
#define PUBLIC_FPDF_FORMFILL_H_

#include "fpdfview.h"

typedef void* FPDF_FORMHANDLE;

// Exported Functions
#ifdef __cplusplus
extern "C" {
#endif

typedef struct _IPDF_JsPlatform {
  /**
  * Version number of the interface. Currently must be 2.
  **/
  int version;

  /* Version 1. */

  /**
  * Method: app_alert
  *           pop up a dialog to show warning or hint.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *           pThis       -   Pointer to the interface structure itself
  *           Msg         -   A string containing the message to be displayed.
  *           Title       -   The title of the dialog.
  *           Type        -   The stype of button group.
  *                           0-OK(default);
  *                           1-OK,Cancel;
  *                           2-Yes,NO;
  *                           3-Yes, NO, Cancel.
  *           nIcon       -   The Icon type.
  *                           0-Error(default);
  *                           1-Warning;
  *                           2-Question;
  *                           3-Status.
  * Return Value:
  *           The return value could be the folowing type:
  *                           1-OK;
  *                           2-Cancel;
  *                           3-NO;
  *                           4-Yes;
  */
  int (*app_alert)(struct _IPDF_JsPlatform* pThis,
                   FPDF_WIDESTRING Msg,
                   FPDF_WIDESTRING Title,
                   int Type,
                   int Icon);

  /**
  * Method: app_beep
  *           Causes the system to play a sound.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *           pThis       -   Pointer to the interface structure itself
  *           nType       -   The sound type.
  *                           0 - Error
  *                           1 - Warning
  *                           2 - Question
  *                           3 - Status
  *                           4 - Default (default value)
  * Return Value:
  *           None
  */
  void (*app_beep)(struct _IPDF_JsPlatform* pThis, int nType);

  /**
  * Method: app_response
  *           Displays a dialog box containing a question and an entry field for
  * the user to reply to the question.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *           pThis       -   Pointer to the interface structure itself
  *           Question    -   The question to be posed to the user.
  *           Title       -   The title of the dialog box.
  *           Default     -   A default value for the answer to the question. If
  * not specified, no default value is presented.
  *           cLabel      -   A short string to appear in front of and on the
  * same line as the edit text field.
  *           bPassword   -   If true, indicates that the user's response should
  * show as asterisks (*) or bullets (?) to mask the response, which might be
  * sensitive information. The default is false.
  *           response    -   A string buffer allocated by SDK, to receive the
  * user's response.
  *           length      -   The length of the buffer, number of bytes.
  * Currently, It's always be 2048.
  * Return Value:
  *       Number of bytes the complete user input would actually require, not
  * including trailing zeros, regardless of the value of the length
  *       parameter or the presence of the response buffer.
  * Comments:
  *       No matter on what platform, the response buffer should be always
  * written using UTF-16LE encoding. If a response buffer is
  *       present and the size of the user input exceeds the capacity of the
  * buffer as specified by the length parameter, only the
  *       first "length" bytes of the user input are to be written to the
  * buffer.
  */
  int (*app_response)(struct _IPDF_JsPlatform* pThis,
                      FPDF_WIDESTRING Question,
                      FPDF_WIDESTRING Title,
                      FPDF_WIDESTRING Default,
                      FPDF_WIDESTRING cLabel,
                      FPDF_BOOL bPassword,
                      void* response,
                      int length);

  /*
  * Method: Doc_getFilePath
  *           Get the file path of the current document.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *           pThis       -   Pointer to the interface structure itself
  *           filePath    -   The string buffer to receive the file path. Can be
  * NULL.
  *           length      -   The length of the buffer, number of bytes. Can be
  * 0.
  * Return Value:
  *       Number of bytes the filePath consumes, including trailing zeros.
  * Comments:
  *       The filePath should be always input in local encoding.
  *
  *       The return value always indicated number of bytes required for the
  * buffer, even when there is
  *       no buffer specified, or the buffer size is less then required. In this
  * case, the buffer will not
  *       be modified.
  */
  int (*Doc_getFilePath)(struct _IPDF_JsPlatform* pThis,
                         void* filePath,
                         int length);

  /*
  * Method: Doc_mail
  *           Mails the data buffer as an attachment to all recipients, with or
  * without user interaction.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *           pThis       -   Pointer to the interface structure itself
  *           mailData    -   Pointer to the data buffer to be sent.Can be NULL.
  *           length      -   The size,in bytes, of the buffer pointed by
  * mailData parameter.Can be 0.
  *           bUI         -   If true, the rest of the parameters are used in a
  * compose-new-message window that is displayed to the user. If false, the cTo
  * parameter is required and all others are optional.
  *           To          -   A semicolon-delimited list of recipients for the
  * message.
  *           Subject     -   The subject of the message. The length limit is 64
  * KB.
  *           CC          -   A semicolon-delimited list of CC recipients for
  * the message.
  *           BCC         -   A semicolon-delimited list of BCC recipients for
  * the message.
  *           Msg         -   The content of the message. The length limit is 64
  * KB.
  * Return Value:
  *           None.
  * Comments:
  *           If the parameter mailData is NULL or length is 0, the current
  * document will be mailed as an attachment to all recipients.
  */
  void (*Doc_mail)(struct _IPDF_JsPlatform* pThis,
                   void* mailData,
                   int length,
                   FPDF_BOOL bUI,
                   FPDF_WIDESTRING To,
                   FPDF_WIDESTRING Subject,
                   FPDF_WIDESTRING CC,
                   FPDF_WIDESTRING BCC,
                   FPDF_WIDESTRING Msg);

  /*
  * Method: Doc_print
  *           Prints all or a specific number of pages of the document.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *           pThis       -   Pointer to the interface structure itself.
  *           bUI         -   If true, will cause a UI to be presented to the
  * user to obtain printing information and confirm the action.
  *           nStart      -   A 0-based index that defines the start of an
  * inclusive range of pages.
  *           nEnd        -   A 0-based index that defines the end of an
  * inclusive page range.
  *           bSilent     -   If true, suppresses the cancel dialog box while
  * the document is printing. The default is false.
  *           bShrinkToFit    -   If true, the page is shrunk (if necessary) to
  * fit within the imageable area of the printed page.
  *           bPrintAsImage   -   If true, print pages as an image.
  *           bReverse    -   If true, print from nEnd to nStart.
  *           bAnnotations    -   If true (the default), annotations are
  * printed.
  */
  void (*Doc_print)(struct _IPDF_JsPlatform* pThis,
                    FPDF_BOOL bUI,
                    int nStart,
                    int nEnd,
                    FPDF_BOOL bSilent,
                    FPDF_BOOL bShrinkToFit,
                    FPDF_BOOL bPrintAsImage,
                    FPDF_BOOL bReverse,
                    FPDF_BOOL bAnnotations);

  /*
  * Method: Doc_submitForm
  *           Send the form data to a specified URL.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *           pThis       -   Pointer to the interface structure itself
  *           formData    -   Pointer to the data buffer to be sent.
  *           length      -   The size,in bytes, of the buffer pointed by
  * formData parameter.
  *           URL         -   The URL to send to.
  * Return Value:
  *           None.
  *
  */
  void (*Doc_submitForm)(struct _IPDF_JsPlatform* pThis,
                         void* formData,
                         int length,
                         FPDF_WIDESTRING URL);

  /*
  * Method: Doc_gotoPage
  *           Jump to a specified page.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *           pThis       -   Pointer to the interface structure itself
  *           nPageNum    -   The specified page number, zero for the first
  * page.
  * Return Value:
  *           None.
  *
  */
  void (*Doc_gotoPage)(struct _IPDF_JsPlatform* pThis, int nPageNum);
  /*
  * Method: Field_browse
  *           Show a file selection dialog, and return the selected file path.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *           pThis       -   Pointer to the interface structure itself.
  *           filePath    -   Pointer to the data buffer to receive the file
  * path.Can be NULL.
  *           length      -   The length of the buffer, number of bytes. Can be
  * 0.
  * Return Value:
  *       Number of bytes the filePath consumes, including trailing zeros.
  * Comments:
  *       The filePath shoule be always input in local encoding.
  */
  int (*Field_browse)(struct _IPDF_JsPlatform* pThis,
                      void* filePath,
                      int length);

  /**
  *   pointer to FPDF_FORMFILLINFO interface.
  **/
  void* m_pFormfillinfo;

  /* Version 2. */

  /**
  *   pointer to the v8::Isolate to use, or NULL to force PDFium to create one.
  **/
  void* m_isolate;

  /**
   *   The embedder data slot to use in the v8::Isolate to store PDFium's
   *   per-isolate data. The value needs to be between 0 and
   *   v8::Internals::kNumIsolateDataLots (exclusive).
   */
  unsigned int m_v8EmbedderSlot;
} IPDF_JSPLATFORM;

// Flags for Cursor type
#define FXCT_ARROW 0
#define FXCT_NESW 1
#define FXCT_NWSE 2
#define FXCT_VBEAM 3
#define FXCT_HBEAM 4
#define FXCT_HAND 5

/**
 * Declares of a pointer type to the callback function for the FFI_SetTimer
 *method.
 * Parameters:
 *          idEvent     -   Identifier of the timer.
 * Return value:
 *          None.
 **/
typedef void (*TimerCallback)(int idEvent);

/**
 * Declares of a struct type to the local system time.
**/
typedef struct _FPDF_SYSTEMTIME {
  unsigned short wYear;         /* years since 1900 */
  unsigned short wMonth;        /* months since January - [0,11] */
  unsigned short wDayOfWeek;    /* days since Sunday - [0,6] */
  unsigned short wDay;          /* day of the month - [1,31] */
  unsigned short wHour;         /* hours since midnight - [0,23] */
  unsigned short wMinute;       /* minutes after the hour - [0,59] */
  unsigned short wSecond;       /* seconds after the minute - [0,59] */
  unsigned short wMilliseconds; /* milliseconds after the second - [0,999] */
} FPDF_SYSTEMTIME;

typedef struct _FPDF_FORMFILLINFO {
  /**
   * Version number of the interface. Currently must be 1.
   **/
  int version;

  /**
*Method: Release
*         Give implementation a chance to release any data after the interface
* is no longer used
*Interface Version:
*         1
*Implementation Required:
*         No
*Comments:
*         Called by Foxit SDK during the final cleanup process.
*Parameters:
*         pThis       -   Pointer to the interface structure itself
*Return Value:
*         None
*/

  void (*Release)(struct _FPDF_FORMFILLINFO* pThis);

  /**
   * Method: FFI_Invalidate
   *          Invalidate the client area within the specified rectangle.
   * Interface Version:
   *          1
   * Implementation Required:
      *           yes
   * Parameters:
   *          pThis       -   Pointer to the interface structure itself.
   *          page        -   Handle to the page. Returned by FPDF_LoadPage
   *function.
   *          left        -   Left position of the client area in PDF page
   *coordinate.
   *          top         -   Top  position of the client area in PDF page
   *coordinate.
   *          right       -   Right position of the client area in PDF page
   *coordinate.
   *          bottom      -   Bottom position of the client area in PDF page
   *coordinate.
   * Return Value:
   *          None.
   *
   *comments:
   *          All positions are measured in PDF "user space".
   *          Implementation should call FPDF_RenderPageBitmap() function for
   *repainting a specified page area.
  */
  void (*FFI_Invalidate)(struct _FPDF_FORMFILLINFO* pThis,
                         FPDF_PAGE page,
                         double left,
                         double top,
                         double right,
                         double bottom);

  /**
   * Method: FFI_OutputSelectedRect
   *          When user is taking the mouse to select texts on a form field,
   * this callback function will keep
   *          returning the selected areas to the implementation.
   *
   * Interface Version:
   *          1
   * Implementation Required:
   *          No
   * Parameters:
   *          pThis       -   Pointer to the interface structure itself.
   *          page        -   Handle to the page. Returned by FPDF_LoadPage
   * function.
   *          left        -   Left position of the client area in PDF page
   * coordinate.
   *          top         -   Top  position of the client area in PDF page
   * coordinate.
   *          right       -   Right position of the client area in PDF page
   * coordinate.
   *          bottom      -   Bottom position of the client area in PDF page
   * coordinate.
   * Return Value:
   *          None.
   *
   * comments:
   *          This CALLBACK function is useful for implementing special text
   * selection effect. Implementation should
   *          first records the returned rectangles, then draw them one by one
   * at the painting period, last,remove all
   *          the recorded rectangles when finish painting.
  */
  void (*FFI_OutputSelectedRect)(struct _FPDF_FORMFILLINFO* pThis,
                                 FPDF_PAGE page,
                                 double left,
                                 double top,
                                 double right,
                                 double bottom);

  /**
  * Method: FFI_SetCursor
  *           Set the Cursor shape.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *       pThis       -   Pointer to the interface structure itself.
  *       nCursorType -   Cursor type. see Flags for Cursor type for the
  * details.
  *   Return value:
  *       None.
  * */
  void (*FFI_SetCursor)(struct _FPDF_FORMFILLINFO* pThis, int nCursorType);

  /**
  * Method: FFI_SetTimer
  *           This method installs a system timer. A time-out value is
  * specified,
  *           and every time a time-out occurs, the system passes a message to
  *           the TimerProc callback function.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *       pThis       -   Pointer to the interface structure itself.
  *       uElapse     -   Specifies the time-out value, in milliseconds.
  *       lpTimerFunc -   A pointer to the callback function-TimerCallback.
  *   Return value:
  *       The timer identifier of the new timer if the function is successful.
  *       An application passes this value to the FFI_KillTimer method to kill
  *       the timer. Nonzero if it is successful; otherwise, it is zero.
  * */
  int (*FFI_SetTimer)(struct _FPDF_FORMFILLINFO* pThis,
                      int uElapse,
                      TimerCallback lpTimerFunc);

  /**
  * Method: FFI_KillTimer
  *           This method kills the timer event identified by nIDEvent, set by
  * an earlier call to FFI_SetTimer.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *       pThis       -   Pointer to the interface structure itself.
  *       nTimerID    -   The timer ID return by FFI_SetTimer function.
  *   Return value:
  *       None.
  * */
  void (*FFI_KillTimer)(struct _FPDF_FORMFILLINFO* pThis, int nTimerID);

  /**
  * Method: FFI_GetLocalTime
  *           This method receives the current local time on the system.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *       pThis       -   Pointer to the interface structure itself.
  *   Return value:
  *       None.
  * */
  FPDF_SYSTEMTIME (*FFI_GetLocalTime)(struct _FPDF_FORMFILLINFO* pThis);

  /**
  * Method: FFI_OnChange
  *           This method will be invoked to notify implementation when the
  * value of any FormField on the document had been changed.
  * Interface Version:
  *           1
  * Implementation Required:
  *           no
  * Parameters:
  *       pThis       -   Pointer to the interface structure itself.
  *   Return value:
  *       None.
  * */
  void (*FFI_OnChange)(struct _FPDF_FORMFILLINFO* pThis);

  /**
  * Method: FFI_GetPage
  *           This method receives the page pointer associated with a specified
  * page index.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *       pThis       -   Pointer to the interface structure itself.
  *       document    -   Handle to document. Returned by FPDF_LoadDocument
  * function.
  *       nPageIndex  -   Index number of the page. 0 for the first page.
  * Return value:
  *       Handle to the page. Returned by FPDF_LoadPage function.
  * Comments:
  *       In some cases, the document-level JavaScript action may refer to a
  * page which hadn't been loaded yet.
  *       To successfully run the javascript action, implementation need to load
  * the page for SDK.
  * */
  FPDF_PAGE   (*FFI_GetPage)(struct _FPDF_FORMFILLINFO* pThis, FPDF_DOCUMENT document, int nPageIndex);

  /**
  * Method: FFI_GetCurrentPage
  *       This method receives the current page pointer.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *       pThis       -   Pointer to the interface structure itself.
  *       document    -   Handle to document. Returned by FPDF_LoadDocument
  * function.
  * Return value:
  *       Handle to the page. Returned by FPDF_LoadPage function.
  * */
  FPDF_PAGE   (*FFI_GetCurrentPage)(struct _FPDF_FORMFILLINFO* pThis, FPDF_DOCUMENT document);

  /**
  * Method: FFI_GetRotation
  *           This method receives currently rotation of the page view.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *       pThis       -   Pointer to the interface structure itself.
  *       page        -   Handle to page. Returned by FPDF_LoadPage function.
  * Return value:
  *       The page rotation. Should be 0(0 degree),1(90 degree),2(180
  * degree),3(270 degree), in a clockwise direction.
  * */
  int (*FFI_GetRotation)(struct _FPDF_FORMFILLINFO* pThis, FPDF_PAGE page);

  /**
  * Method: FFI_ExecuteNamedAction
  *           This method will execute an named action.
  * Interface Version:
  *           1
  * Implementation Required:
  *           yes
  * Parameters:
  *       pThis           -   Pointer to the interface structure itself.
  *       namedAction     -   A byte string which indicates the named action,
  * terminated by 0.
  * Return value:
  *       None.
  * Comments:
  *       See the named actions description of <<PDF Reference, version 1.7>>
  * for more details.
  * */
  void (*FFI_ExecuteNamedAction)(struct _FPDF_FORMFILLINFO* pThis,
                                 FPDF_BYTESTRING namedAction);
  /**
  * @brief This method will be called when a text field is getting or losing a
  * focus.
  *
  * @param[in] pThis      Pointer to the interface structure itself.
  * @param[in] value      The string value of the form field, in UTF-16LE
  * format.
  * @param[in] valueLen   The length of the string value, number of characters
  * (not bytes).
  * @param[in] is_focus   True if the form field is getting a focus, False for
  * losing a focus.
  *
  * @return None.
  *
  * @note Currently,only support text field and combobox field.
  * */
  void (*FFI_SetTextFieldFocus)(struct _FPDF_FORMFILLINFO* pThis,
                                FPDF_WIDESTRING value,
                                FPDF_DWORD valueLen,
                                FPDF_BOOL is_focus);

  /**
  * Method: FFI_DoURIAction
  *           This action resolves to a uniform resource identifier.
  * Interface Version:
  *           1
  * Implementation Required:
  *           No
  * Parameters:
  *       pThis           -   Pointer to the interface structure itself.
  *       bsURI           -   A byte string which indicates the uniform resource
  * identifier, terminated by 0.
  * Return value:
  *       None.
  * Comments:
  *       See the URI actions description of <<PDF Reference, version 1.7>> for
  * more details.
  * */
  void (*FFI_DoURIAction)(struct _FPDF_FORMFILLINFO* pThis,
                          FPDF_BYTESTRING bsURI);

  /**
  * Method: FFI_DoGoToAction
  *           This action changes the view to a specified destination.
  * Interface Version:
  *           1
  * Implementation Required:
  *           No
  * Parameters:
  *       pThis           -   Pointer to the interface structure itself.
  *       nPageIndex      -   The index of the PDF page.
  *       zoomMode        -   The zoom mode for viewing page.See Macros
  *"PDFZOOM_XXX" defined in "fpdfdoc.h".
  *       fPosArray       -   The float array which carries the position info.
  *       sizeofArray     -   The size of float array.
  * Return value:
  *       None.
  * Comments:
  *       See the Destinations description of <<PDF Reference, version 1.7>> in
  *8.2.1 for more details.
  **/
  void (*FFI_DoGoToAction)(struct _FPDF_FORMFILLINFO* pThis,
                           int nPageIndex,
                           int zoomMode,
                           float* fPosArray,
                           int sizeofArray);
  /**
  *   pointer to IPDF_JSPLATFORM interface
  **/
  IPDF_JSPLATFORM* m_pJsPlatform;

} FPDF_FORMFILLINFO;

/**
 * Function: FPDFDOC_InitFormFillEnvironment
 *          Init form fill environment.
 * Comments:
 *          This function should be called before any form fill operation.
 * Parameters:
 *          document        -   Handle to document. Returned by
 *FPDF_LoadDocument function.
 *          pFormFillInfo   -   Pointer to a FPDF_FORMFILLINFO structure.
 * Return Value:
 *          Return handler to the form fill module. NULL means fails.
 **/
DLLEXPORT FPDF_FORMHANDLE STDCALL
FPDFDOC_InitFormFillEnvironment(FPDF_DOCUMENT document,
                                FPDF_FORMFILLINFO* formInfo);

/**
 * Function: FPDFDOC_ExitFormFillEnvironment
 *          Exit form fill environment.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 * Return Value:
 *          NULL.
 **/
DLLEXPORT void STDCALL FPDFDOC_ExitFormFillEnvironment(FPDF_FORMHANDLE hHandle);

/**
 * Function: FORM_OnAfterLoadPage
 *          This method is required for implementing all the form related
 *functions. Should be invoked after user
 *          successfully loaded a PDF page, and method
 *FPDFDOC_InitFormFillEnvironment had been invoked.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 * Return Value:
 *          NONE.
 **/
DLLEXPORT void STDCALL FORM_OnAfterLoadPage(FPDF_PAGE page,
                                            FPDF_FORMHANDLE hHandle);

/**
 * Function: FORM_OnBeforeClosePage
 *          This method is required for implementing all the form related
 *functions. Should be invoked before user
 *          close the PDF page.
 * Parameters:
 *          page        -   Handle to the page. Returned by FPDF_LoadPage
 *function.
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 * Return Value:
 *          NONE.
 **/
DLLEXPORT void STDCALL FORM_OnBeforeClosePage(FPDF_PAGE page,
                                              FPDF_FORMHANDLE hHandle);

/**
* Function: FORM_DoDocumentJSAction
*           This method is required for performing Document-level JavaScript
*action. It should be invoked after the PDF document
*           had been loaded.
* Parameters:
*           hHandle     -   Handle to the form fill module. Returned by
*FPDFDOC_InitFormFillEnvironment.
* Return Value:
*           NONE
* Comments:
*           If there is Document-level JavaScript action embedded in the
*document, this method will execute the javascript action;
*           otherwise, the method will do nothing.
**/
DLLEXPORT void STDCALL FORM_DoDocumentJSAction(FPDF_FORMHANDLE hHandle);

/**
* Function: FORM_DoDocumentOpenAction
*           This method is required for performing open-action when the document
*is opened.
* Parameters:
*           hHandle     -   Handle to the form fill module. Returned by
*FPDFDOC_InitFormFillEnvironment.
* Return Value:
*           NONE
* Comments:
*           This method will do nothing if there is no open-actions embedded in
*the document.
**/
DLLEXPORT void STDCALL FORM_DoDocumentOpenAction(FPDF_FORMHANDLE hHandle);

// additional actions type of document.
#define FPDFDOC_AACTION_WC \
  0x10  // WC, before closing document, JavaScript action.
#define FPDFDOC_AACTION_WS \
  0x11  // WS, before saving document, JavaScript action.
#define FPDFDOC_AACTION_DS 0x12  // DS, after saving document, JavaScript
                                 // action.
#define FPDFDOC_AACTION_WP \
  0x13  // WP, before printing document, JavaScript action.
#define FPDFDOC_AACTION_DP \
  0x14  // DP, after printing document, JavaScript action.
/**
* Function: FORM_DoDocumentAAction
*           This method is required for performing the document's
*additional-action.
* Parameters:
*           hHandle     -   Handle to the form fill module. Returned by
*FPDFDOC_InitFormFillEnvironment.
*           aaType      -   The type of the additional-actions which defined
*above.
* Return Value:
*           NONE
* Comments:
*           This method will do nothing if there is no document
*additional-action corresponding to the specified aaType.
**/

DLLEXPORT void STDCALL FORM_DoDocumentAAction(FPDF_FORMHANDLE hHandle,
                                              int aaType);

// Additional-action types of page object
#define FPDFPAGE_AACTION_OPEN \
  0  // /O -- An action to be performed when the page is opened
#define FPDFPAGE_AACTION_CLOSE \
  1  // /C -- An action to be performed when the page is closed

/**
* Function: FORM_DoPageAAction
*           This method is required for performing the page object's
*additional-action when opened or closed.
* Parameters:
*           page        -   Handle to the page. Returned by FPDF_LoadPage
*function.
*           hHandle     -   Handle to the form fill module. Returned by
*FPDFDOC_InitFormFillEnvironment.
*           aaType      -   The type of the page object's additional-actions
*which defined above.
* Return Value:
*           NONE
* Comments:
*           This method will do nothing if no additional-action corresponding to
*the specified aaType exists.
**/
DLLEXPORT void STDCALL FORM_DoPageAAction(FPDF_PAGE page,
                                          FPDF_FORMHANDLE hHandle,
                                          int aaType);

/**
 * Function: FORM_OnMouseMove
 *          You can call this member function when the mouse cursor moves.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 *          page        -   Handle to the page. Returned by FPDF_LoadPage
 *function.
 *          modifier        -   Indicates whether various virtual keys are down.
 *          page_x      -   Specifies the x-coordinate of the cursor in PDF user
 *space.
 *          page_y      -   Specifies the y-coordinate of the cursor in PDF user
 *space.
 * Return Value:
 *          TRUE indicates success; otherwise false.
 **/
DLLEXPORT FPDF_BOOL STDCALL FORM_OnMouseMove(FPDF_FORMHANDLE hHandle,
                                             FPDF_PAGE page,
                                             int modifier,
                                             double page_x,
                                             double page_y);

/**
 * Function: FORM_OnLButtonDown
 *          You can call this member function when the user presses the left
 *mouse button.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 *          page        -   Handle to the page. Returned by FPDF_LoadPage
 *function.
 *          modifier        -   Indicates whether various virtual keys are down.
 *          page_x      -   Specifies the x-coordinate of the cursor in PDF user
 *space.
 *          page_y      -   Specifies the y-coordinate of the cursor in PDF user
 *space.
 * Return Value:
 *          TRUE indicates success; otherwise false.
 **/
DLLEXPORT FPDF_BOOL STDCALL FORM_OnLButtonDown(FPDF_FORMHANDLE hHandle,
                                               FPDF_PAGE page,
                                               int modifier,
                                               double page_x,
                                               double page_y);

/**
 * Function: FORM_OnLButtonUp
 *          You can call this member function when the user releases the left
 *mouse button.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 *          page        -   Handle to the page. Returned by FPDF_LoadPage
 *function.
 *          modifier    -   Indicates whether various virtual keys are down.
 *          page_x      -   Specifies the x-coordinate of the cursor in device.
 *          page_y      -   Specifies the y-coordinate of the cursor in device.
 * Return Value:
 *          TRUE indicates success; otherwise false.
 **/
DLLEXPORT FPDF_BOOL STDCALL FORM_OnLButtonUp(FPDF_FORMHANDLE hHandle,
                                             FPDF_PAGE page,
                                             int modifier,
                                             double page_x,
                                             double page_y);

/**
 * Function: FORM_OnKeyDown
 *          You can call this member function when a nonsystem key is pressed.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 *          page        -   Handle to the page. Returned by FPDF_LoadPage
 *function.
 *          nKeyCode    -   Indicates whether various virtual keys are down.
 *          modifier    -   Contains the scan code, key-transition code,
 *previous key state, and context code.
 * Return Value:
 *          TRUE indicates success; otherwise false.
 **/
DLLEXPORT FPDF_BOOL STDCALL FORM_OnKeyDown(FPDF_FORMHANDLE hHandle,
                                           FPDF_PAGE page,
                                           int nKeyCode,
                                           int modifier);

/**
 * Function: FORM_OnKeyUp
 *          You can call this member function when a nonsystem key is released.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 *          page        -   Handle to the page. Returned by FPDF_LoadPage
 *function.
 *          nKeyCode    -   The virtual-key code of the given key.
 *          modifier    -   Contains the scan code, key-transition code,
 *previous key state, and context code.
 * Return Value:
 *          TRUE indicates success; otherwise false.
 **/
DLLEXPORT FPDF_BOOL STDCALL FORM_OnKeyUp(FPDF_FORMHANDLE hHandle,
                                         FPDF_PAGE page,
                                         int nKeyCode,
                                         int modifier);

/**
 * Function: FORM_OnChar
 *          You can call this member function when a keystroke translates to a
 *nonsystem character.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 *          page        -   Handle to the page. Returned by FPDF_LoadPage
 *function.
 *          nChar       -   The character code value of the key.
 *          modifier    -   Contains the scan code, key-transition code,
 *previous key state, and context code.
 * Return Value:
 *          TRUE indicates success; otherwise false.
 **/
DLLEXPORT FPDF_BOOL STDCALL FORM_OnChar(FPDF_FORMHANDLE hHandle,
                                        FPDF_PAGE page,
                                        int nChar,
                                        int modifier);

/**
 * Function: FORM_ForceToKillFocus.
 *          You can call this member function to force to kill the focus of the
 *form field which got focus.
 *          It would kill the focus on the form field, save the value of form
 *field if it's changed by user.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 * Return Value:
 *          TRUE indicates success; otherwise false.
 **/
DLLEXPORT FPDF_BOOL STDCALL FORM_ForceToKillFocus(FPDF_FORMHANDLE hHandle);

// Field Types
#define FPDF_FORMFIELD_UNKNOWN 0      // Unknown.
#define FPDF_FORMFIELD_PUSHBUTTON 1   // push button type.
#define FPDF_FORMFIELD_CHECKBOX 2     // check box type.
#define FPDF_FORMFIELD_RADIOBUTTON 3  // radio button type.
#define FPDF_FORMFIELD_COMBOBOX 4     // combo box type.
#define FPDF_FORMFIELD_LISTBOX 5      // list box type.
#define FPDF_FORMFIELD_TEXTFIELD 6    // text field type.

/**
 * Function: FPDPage_HasFormFieldAtPoint
 *          Check the form filed position by point.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 *          page        -   Handle to the page. Returned by FPDF_LoadPage
 *function.
 *          page_x      -   X position in PDF "user space".
 *          page_y      -   Y position in PDF "user space".
 * Return Value:
 *          Return the type of the formfiled; -1 indicates no fields.
 **/
DLLEXPORT int STDCALL FPDPage_HasFormFieldAtPoint(FPDF_FORMHANDLE hHandle,
                                                  FPDF_PAGE page,
                                                  double page_x,
                                                  double page_y);

/**
 * Function: FPDF_SetFormFieldHighlightColor
 *          Set the highlight color of specified or all the form fields in the
 *document.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 *          doc         -   Handle to the document. Returned by
 *FPDF_LoadDocument function.
 *          fieldType   -   A 32-bit integer indicating the type of a form
 *field(defined above).
 *          color       -   The highlight color of the form field.Constructed by
 *0xxxrrggbb.
 * Return Value:
 *          NONE.
 * Comments:
 *          When the parameter fieldType is set to zero, the highlight color
 *will be applied to all the form fields in the
 *          document.
 *          Please refresh the client window to show the highlight immediately
 *if necessary.
 **/
DLLEXPORT void STDCALL FPDF_SetFormFieldHighlightColor(FPDF_FORMHANDLE hHandle,
                                                       int fieldType,
                                                       unsigned long color);

/**
 * Function: FPDF_SetFormFieldHighlightAlpha
 *          Set the transparency of the form field highlight color in the
 *document.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 *          doc         -   Handle to the document. Returned by
 *FPDF_LoadDocument function.
 *          alpha       -   The transparency of the form field highlight color.
 *between 0-255.
 * Return Value:
 *          NONE.
 **/
DLLEXPORT void STDCALL FPDF_SetFormFieldHighlightAlpha(FPDF_FORMHANDLE hHandle,
                                                       unsigned char alpha);

/**
 * Function: FPDF_RemoveFormFieldHighlight
 *          Remove the form field highlight color in the document.
 * Parameters:
 *          hHandle     -   Handle to the form fill module. Returned by
 *FPDFDOC_InitFormFillEnvironment.
 * Return Value:
 *          NONE.
 * Comments:
 *          Please refresh the client window to remove the highlight immediately
 *if necessary.
 **/
DLLEXPORT void STDCALL FPDF_RemoveFormFieldHighlight(FPDF_FORMHANDLE hHandle);

/**
* Function: FPDF_FFLDraw
*           Render FormFeilds on a page to a device independent bitmap.
* Parameters:
*           hHandle     -   Handle to the form fill module. Returned by
*FPDFDOC_InitFormFillEnvironment.
*           bitmap      -   Handle to the device independent bitmap (as the
*output buffer).
*                           Bitmap handle can be created by FPDFBitmap_Create
*function.
*           page        -   Handle to the page. Returned by FPDF_LoadPage
*function.
*           start_x     -   Left pixel position of the display area in the
*device coordinate.
*           start_y     -   Top pixel position of the display area in the device
*coordinate.
*           size_x      -   Horizontal size (in pixels) for displaying the page.
*           size_y      -   Vertical size (in pixels) for displaying the page.
*           rotate      -   Page orientation: 0 (normal), 1 (rotated 90 degrees
*clockwise),
*                               2 (rotated 180 degrees), 3 (rotated 90 degrees
*counter-clockwise).
*           flags       -   0 for normal display, or combination of flags
*defined above.
* Return Value:
*           None.
* Comments:
*           This method is designed to only render annotations and FormFields on
*the page.
*           Without FPDF_ANNOT specified for flags, Rendering functions such as
*FPDF_RenderPageBitmap or FPDF_RenderPageBitmap_Start will only render page
*contents(without annotations) to a bitmap.
*           In order to implement the FormFill functions,Implementation should
*call this method after rendering functions finish rendering the page contents.
**/
DLLEXPORT void STDCALL FPDF_FFLDraw(FPDF_FORMHANDLE hHandle,
                                    FPDF_BITMAP bitmap,
                                    FPDF_PAGE page,
                                    int start_x,
                                    int start_y,
                                    int size_x,
                                    int size_y,
                                    int rotate,
                                    int flags);

#ifdef __cplusplus
}
#endif

#endif  // PUBLIC_FPDF_FORMFILL_H_