public/fpdf_formfill.h

// 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;

#define DOCTYPE_PDF          0 //Normal pdf Document
#define DOCTYPE_DYNIMIC_XFA  1 //Dynimic xfa Document Type
#define DOCTYPE_STATIC_XFA   2 //Static xfa Document Type

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

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

    /**
    * 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.
    *                           4-Asterisk

    * 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;
} 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;

//XFA
/**
 * @name Pageview  event flags
 */
/*@{*/
/** @brief After a new pageview is added. */
#define  FXFA_PAGEVIEWEVENT_POSTADDED       1
/** @brief After a pageview is removed. */
#define  FXFA_PAGEVIEWEVENT_POSTREMOVED     3
/*@}*/

// menu
/**
 * @name Macro Definitions for Right Context Menu Features Of XFA Fields
 */
/*@{*/
#define  FXFA_MEMU_COPY         1
#define  FXFA_MEMU_CUT          2
#define  FXFA_MEMU_SELECTALL    4
#define  FXFA_MEMU_UNDO         8
#define  FXFA_MEMU_REDO         16
#define  FXFA_MEMU_PASTE        32
/*@}*/

// file type
/**
 * @name Macro Definitions for File Type.
 */
/*@{*/
#define FXFA_SAVEAS_XML     1
#define FXFA_SAVEAS_XDP     2
/*@}*/

typedef struct  _FPDF_FORMFILLINFO
{
    /**
     * Version number of the interface. Currently must be 2 (with XFA module).
     **/
    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;

  /**
    * Method: FFI_DisplayCaret
    *           This method will show the caret at specified position.
    * Interface Version:
    *           1
    * Implementation Required:
    *           yes
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       page            -   Handle to 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.
    **/
    void    (*FFI_DisplayCaret)(struct _FPDF_FORMFILLINFO* pThis, FPDF_PAGE page, FPDF_BOOL bVisible, double left, double top, double right, double bottom);
    /**
    * Method: FFI_GetCurrentPageIndex
    *           This method will get the current 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.
    * Return value:
    *       The index of current page.
    **/
    int     (*FFI_GetCurrentPageIndex)(struct _FPDF_FORMFILLINFO* pThis, FPDF_DOCUMENT document);
    /**
    * Method: FFI_SetCurrentPage
    *           This method will set the current page.
    * Interface Version:
    *           1
    * Implementation Required:
    *           yes
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       document        -   Handle to document. Returned by FPDF_LoadDocument function.
    *       iCurPage        -   The index of the PDF page.
    * Return value:
    *       None.
    **/
    void    (*FFI_SetCurrentPage)(struct _FPDF_FORMFILLINFO* pThis, FPDF_DOCUMENT document, int iCurPage);
    /**
    * Method: FFI_GotoURL
    *           This method will link to the specified URL.
    * Interface Version:
    *           1
    * Implementation Required:
    *           no
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       document        -   Handle to document. Returned by FPDF_LoadDocument function.
    *       wsURL           -   The string value of the URL, in UTF-16LE format.
    * Return value:
    *       None.
    **/
    void    (*FFI_GotoURL)(struct _FPDF_FORMFILLINFO* pThis, FPDF_DOCUMENT document, FPDF_WIDESTRING wsURL);
    /**
    * Method: FFI_GetPageViewRect
    *           This method will get the current page view rectangle.
    * Interface Version:
    *           1
    * Implementation Required:
    *           yes
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       page            -   Handle to page. Returned by FPDF_LoadPage function.
    *       left            -   The pointer to receive left position of the page view area in PDF page coordinate.
    *       top             -   The pointer to receive top position of the page view area in PDF page coordinate.
    *       right           -   The pointer to receive right position of the client area in PDF page coordinate.
    *       bottom          -   The pointer to receive bottom position of the client area in PDF page coordinate.
    * Return value:
    *       None.
    **/
    void    (*FFI_GetPageViewRect)(struct _FPDF_FORMFILLINFO* pThis, FPDF_PAGE page, double* left, double* top, double* right, double* bottom);
    /**
    * Method: FFI_PopupMenu
    *           This method will track the right context menu for XFA fields.
    * Interface Version:
    *           1
    * Implementation Required:
    *           yes
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       page            -   Handle to page. Returned by FPDF_LoadPage function.
    *       hWidget         -   Handle to XFA fields.
    *       menuFlag        -   The menu flags. Please refer to macro definition of FXFA_MEMU_XXX and this can be one or a combination of these macros.
    *       x               -   X position of the client area in PDF page coordinate.
    *       y               -   Y position of the client area in PDF page coordinate.
    * Return value:
    *       TRUE indicates success; otherwise false.
    **/
    FPDF_BOOL (*FFI_PopupMenu)(struct _FPDF_FORMFILLINFO* pThis, FPDF_PAGE page, FPDF_WIDGET hWidget, int menuFlag, float x, float y);
    /**
    * Method: FFI_OpenFile
    *           This method will open the specified file with the specified mode.
    * Interface Version
    *           1
    * Implementation Required:
    *           yes
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       fileFlag        -   The file flag.Please refer to macro definition of FXFA_SAVEAS_XXX and this can be one of these macros.
    *       wsURL           -   The string value of the file URL, in UTF-16LE format.
    *       mode            -   The mode for open file.
    * Return value:
    *       The handle to FPDF_FILEHANDLER.
    **/
    FPDF_FILEHANDLER* (*FFI_OpenFile)(struct _FPDF_FORMFILLINFO* pThis, int fileFlag, FPDF_WIDESTRING wsURL, const char* mode);
    /**
    * Method: FFI_EmailTo
    *           This method will email the specified file stream to the specified contacter.
    * Interface Version:
    *           1
    * Implementation Required:
    *           yes
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       pFileHandler    -   Handle to the FPDF_FILEHANDLER.
    *       pTo             -   A semicolon-delimited list of recipients for the message,in UTF-16LE format.
    *       pSubject        -   The subject of the message,in UTF-16LE format.
    *       pCC             -   A semicolon-delimited list of CC recipients for the message,in UTF-16LE format.
    *       pBcc            -   A semicolon-delimited list of BCC recipients for the message,in UTF-16LE format.
    *       pMsg            -   Pointer to the data buffer to be sent.Can be NULL,in UTF-16LE format.
    * Return value:
    *       None.
    **/
    void    (*FFI_EmailTo)(struct _FPDF_FORMFILLINFO* pThis, FPDF_FILEHANDLER* fileHandler, FPDF_WIDESTRING pTo, FPDF_WIDESTRING pSubject, FPDF_WIDESTRING pCC, FPDF_WIDESTRING pBcc, FPDF_WIDESTRING pMsg);
    /**
    * Method: FFI_UploadTo
    *           This method will get upload the specified file stream to the specified URL.
    * Interface Version:
    *           1
    * Implementation Required:
    *           yes
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       pFileHandler    -   Handle to the FPDF_FILEHANDLER.
    *       fileFlag        -   The file flag.Please refer to macro definition of FXFA_SAVEAS_XXX and this can be one of these macros.
    *       uploadTo        -   Pointer to the URL path, in UTF-16LE format.
    * Return value:
    *       None.
    **/
    void    (*FFI_UploadTo)(struct _FPDF_FORMFILLINFO* pThis, FPDF_FILEHANDLER* fileHandler, int fileFlag, FPDF_WIDESTRING uploadTo);

    /**
    * Method: FFI_GetPlatform
    *           This method will get the current platform.
    * Interface Version:
    *           1
    * Implementation Required:
    *           yes
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       platform        -   Pointer to the data buffer to receive the platform.Can be NULL,in UTF-16LE format.
    *       length          -   The length of the buffer, number of bytes. Can be 0.
    * Return value:
    *       The length of the buffer, number of bytes.
    **/
    int     (*FFI_GetPlatform)(struct _FPDF_FORMFILLINFO* pThis, void* platform, int length);
    /**
    * Method: FFI_GetLanguage
    *           This method will get the current language.
    * Interface Version:
    *           1
    * Implementation Required:
    *           yes
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       language        -   Pointer to the data buffer to receive the current language.Can be NULL.
    *       length          -   The length of the buffer, number of bytes. Can be 0.
    * Return value:
    *       The length of the buffer, number of bytes.
    **/
    int     (*FFI_GetLanguage)(struct _FPDF_FORMFILLINFO* pThis, void* language, int length);
    /**
    * Method: FFI_DownloadFromURL
    *           This method will download the specified file from the URL.
    * Interface Version:
    *           1
    * Implementation Required:
    *           yes
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       URL             -   The string value of the file URL, in UTF-16LE format.
    * Return value:
    *       The handle to FPDF_FILEHANDLER.
    **/
    FPDF_LPFILEHANDLER  (*FFI_DownloadFromURL)(struct _FPDF_FORMFILLINFO* pThis, FPDF_WIDESTRING URL);
    /**
    * Method: FFI_PostRequestURL
    *           This method will post the request to the server URL.
    * Interface Version:
    *           1
    * Implementation Required:
    *           yes
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       wsURL           -   The string value of the server URL, in UTF-16LE format.
    *       wsData          -   The post data,in UTF-16LE format.
    *       wsContentType   -   The content type of the request data,in UTF-16LE format.
    *       wsEncode        -   The encode type,in UTF-16LE format.
    *       wsHeader        -   The request header,in UTF-16LE format.
    *       response        -   Pointer to the FPDF_BSTR to receive the response data from server,,in UTF-16LE format.
    * Return value:
    *       TRUE indicates success, otherwise FALSE.
    **/
    FPDF_BOOL   (*FFI_PostRequestURL)(struct _FPDF_FORMFILLINFO* pThis, FPDF_WIDESTRING wsURL, FPDF_WIDESTRING wsData, FPDF_WIDESTRING wsContentType, FPDF_WIDESTRING wsEncode, FPDF_WIDESTRING wsHeader, FPDF_BSTR* respone);
    /**
    * Method: FFI_PutRequestURL
    *           This method will put the request to the server URL.
    * Interface Version:
    *           1
    * Implementation Required:
    *           yes
    * Parameters:
    *       pThis           -   Pointer to the interface structure itself.
    *       wsURL           -   The string value of the server URL, in UTF-16LE format.
    *       wsData          -   The put data, in UTF-16LE format.
    *       wsEncode        -   The encode type, in UTR-16LE format.
    * Return value:
    *       TRUE indicates success, otherwise FALSE.
    **/
    FPDF_BOOL   (*FFI_PutRequestURL)(struct _FPDF_FORMFILLINFO* pThis, FPDF_WIDESTRING wsURL, FPDF_WIDESTRING wsData, FPDF_WIDESTRING wsEncode);

} 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);

DLLEXPORT FPDF_BOOL STDCALL FORM_OnRButtonDown(FPDF_FORMHANDLE hHandle, FPDF_PAGE page, int modifier, double page_x, double page_y);
DLLEXPORT FPDF_BOOL STDCALL FORM_OnRButtonUp(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.
#define FPDF_FORMFIELD_XFA          7       // 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);
/**
 * Function: FPDF_HasXFAField
 *                      This method is designed to check whether a pdf document has XFA fields.
 * Parameters:
 *                      document                -       Handle to document. Returned by FPDF_LoadDocument function.
 *                      docType                 -       Document type defined as DOCTYPE_xxx.
 * Return Value:
 *                      TRUE indicates that the input document has XFA fields, otherwise FALSE.
 **/
DLLEXPORT FPDF_BOOL STDCALL FPDF_HasXFAField(FPDF_DOCUMENT document, int* docType);

/**
 * Function: FPDF_LoadXFA
 *          If the document consists of XFA fields, there should call this method to load XFA fields.
 * Parameters:
 *          document        -   Handle to document. Returned by FPDF_LoadDocument function.
 * Return Value:
 *          TRUE indicates success,otherwise FALSE.
 **/
DLLEXPORT FPDF_BOOL STDCALL FPDF_LoadXFA(FPDF_DOCUMENT document);

/**
 * Function: FPDF_Widget_Undo
 *          This method will implement the undo feature for the specified xfa field.
 * Parameters:
 *          document        -   Handle to document. Returned by FPDF_LoadDocument function.
 *          hWidget         -   Handle to the xfa field.
 * Return Value:
 *          None.
 **/
DLLEXPORT void STDCALL FPDF_Widget_Undo(FPDF_DOCUMENT document, FPDF_WIDGET hWidget);
/**
 * Function: FPDF_Widget_Redo
 *          This method will implement the redo feature for the specified xfa field.
 * Parameters:
 *          document        -   Handle to document. Returned by FPDF_LoadDocument function.
 *          hWidget         -   Handle to the xfa field.
 * Return Value:
 *          None.
 **/
DLLEXPORT void STDCALL FPDF_Widget_Redo(FPDF_DOCUMENT document, FPDF_WIDGET hWidget);
/**
 * Function: FPDF_Widget_SelectAll
 *          This method will implement the select all feature for the specified xfa field.
 * Parameters:
 *          document        -   Handle to document. Returned by FPDF_LoadDocument function.
 *          hWidget         -   Handle to the xfa field.
 * Return Value:
 *          None.
 **/
DLLEXPORT void STDCALL FPDF_Widget_SelectAll(FPDF_DOCUMENT document, FPDF_WIDGET hWidget);
/**
 * Function: FPDF_Widget_Copy
 *          This method will implement the copy feature for the specified xfa field.
 * Parameters:
 *          document        -   Handle to document. Returned by FPDF_LoadDocument function.
 *          hWidget         -   Handle to the xfa field.
 *          wsText          -   Pointer to data buffer to receive the copied data, in UTF-16LE format.
 *          size            -   The data buffer size.
 * Return Value:
 *          None.
 **/
DLLEXPORT void STDCALL FPDF_Widget_Copy(FPDF_DOCUMENT document, FPDF_WIDGET hWidget, FPDF_WIDESTRING wsText, FPDF_DWORD* size);
/**
 * Function: FPDF_Widget_Cut
 *          This method will implement the cut feature for the specified xfa field.
 * Parameters:
 *          document        -   Handle to document. Returned by FPDF_LoadDocument function.
 *          hWidget         -   Handle to the xfa field.
 *          wsText          -   Pointer to data buffer to receive the cut data,in UTF-16LE format.
 *          size            -   The data buffer size,not the byte number.
 * Return Value:
 *          None.
 **/
DLLEXPORT void STDCALL FPDF_Widget_Cut(FPDF_DOCUMENT document, FPDF_WIDGET hWidget, FPDF_WIDESTRING wsText, FPDF_DWORD* size);
/**
 * Function: FPDF_Widget_Paste
 *          This method will implement the paste feature for the specified xfa field.
 * Parameters:
 *          document        -   Handle to document. Returned by FPDF_LoadDocument function.
 *          hWidget         -   Handle to the xfa field.
 *          wsText          -   The paste text buffer, in UTF-16LE format.
 *          size            -   The data buffer size,not the byte number.
 * Return Value:
 *          None.
 **/
DLLEXPORT void STDCALL FPDF_Widget_Paste(FPDF_DOCUMENT document, FPDF_WIDGET hWidget, FPDF_WIDESTRING wsText, FPDF_DWORD size);
/**
 * Function: FPDF_Widget_ReplaceSpellCheckWord
 *          This method will implement the spell check feature for the specified xfa field.
 * Parameters:
 *          document        -   Handle to document. Returned by FPDF_LoadDocument function.
 *          hWidget         -   Handle to the xfa field.
 *          x               -   The x value of the specified point.
 *          y               -   The y value of the specified point.
 *          bsText          -   The text buffer needed to be speck check, in UTF-16LE format.
 * Return Value:
 *          None.
 **/
DLLEXPORT void STDCALL FPDF_Widget_ReplaceSpellCheckWord(FPDF_DOCUMENT document, FPDF_WIDGET hWidget, float x, float y, FPDF_BYTESTRING bsText);
/**
 * Function: FPDF_Widget_GetSpellCheckWords
 *          This method will implement the spell check feature for the specified xfa field.
 * Parameters:
 *          document        -   Handle to document. Returned by FPDF_LoadDocument function.
 *          hWidget         -   Handle to the xfa field.
 *          x               -   The x value of the specified point.
 *          y               -   The y value of the specified point.
 *          stringHandle    -   Pointer to FPDF_STRINGHANDLE to receive the speck check text buffer, in UTF-16LE format.
 * Return Value:
 *          None.
 **/
DLLEXPORT void STDCALL FPDF_Widget_GetSpellCheckWords(FPDF_DOCUMENT document, FPDF_WIDGET hWidget, float x, float y, FPDF_STRINGHANDLE* stringHandle);
/**
 * Function: FPDF_StringHandleCounts
 *          This method will get the count of the text buffer.
 * Parameters:
 *          stringHandle    -   Pointer to FPDF_STRINGHANDLE.
 * Return Value:
 *          None.
 **/
DLLEXPORT int STDCALL FPDF_StringHandleCounts(FPDF_STRINGHANDLE stringHandle);
/**
 * Function: FPDF_StringHandleGetStringByIndex
 *          This method will get the specified index of the text buffer.
 * Parameters:
 *          stringHandle    -   Pointer to FPDF_STRINGHANDLE.
 *          index           -   The specified index of text buffer.
 *          bsText          -   Pointer to data buffer to receive the text buffer, in UTF-16LE format.
 *          size            -   The byte size of data buffer.
 * Return Value:
 *          TRUE indicates success, otherwise FALSE.
 **/
DLLEXPORT FPDF_BOOL STDCALL FPDF_StringHandleGetStringByIndex(FPDF_STRINGHANDLE stringHandle, int index, FPDF_BYTESTRING bsText, FPDF_DWORD* size);
/**
 * Function: FPDF_StringHandleRelease
 *          This method will release the FPDF_STRINGHANDLE.
 * Parameters:
 *          stringHandle    -   Pointer to FPDF_STRINGHANDLE.
 * Return Value:
 *          None.
 **/
DLLEXPORT void STDCALL FPDF_StringHandleRelease(FPDF_STRINGHANDLE stringHandle);
/**
 * Function: FPDF_StringHandleAddString
 *          This method will add the specified text buffer.
 * Parameters:
 *          stringHandle    -   Pointer to FPDF_STRINGHANDLE.
 *          bsText          -   Pointer to data buffer of the text buffer, in UTF-16LE format.
 *          size            -   The byte size of data buffer.
 * Return Value:
 *          TRUE indicates success, otherwise FALSE.
 **/
DLLEXPORT FPDF_BOOL STDCALL FPDF_StringHandleAddString(FPDF_STRINGHANDLE stringHandle, FPDF_BYTESTRING bsText, FPDF_DWORD size);

#ifdef __cplusplus
}
#endif

#endif  // PUBLIC_FPDF_FORMFILL_H_