go-fitz/include/mupdf/pdf/event.h

// Copyright (C) 2004-2022 Artifex Software, Inc.
//
// This file is part of MuPDF.
//
// MuPDF is free software: you can redistribute it and/or modify it under the
// terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License
// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
//
// Alternative licensing terms are available from the licensor.
// For commercial licensing, see <https://www.artifex.com/> or contact
// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
// CA 94129, USA, for further information.

#ifndef MUPDF_PDF_EVENT_H
#define MUPDF_PDF_EVENT_H

#include "mupdf/pdf/document.h"

/*
	Document events: the objects via which MuPDF informs the calling app
	of occurrences emanating from the document, possibly from user interaction
	or javascript execution. MuPDF informs the app of document events via a
	callback.
*/

struct pdf_doc_event
{
	int type;
};

enum
{
	PDF_DOCUMENT_EVENT_ALERT,
	PDF_DOCUMENT_EVENT_PRINT,
	PDF_DOCUMENT_EVENT_LAUNCH_URL,
	PDF_DOCUMENT_EVENT_MAIL_DOC,
	PDF_DOCUMENT_EVENT_SUBMIT,
	PDF_DOCUMENT_EVENT_EXEC_MENU_ITEM,
};

/*
	set the function via which to receive
	document events.
*/
void pdf_set_doc_event_callback(fz_context *ctx, pdf_document *doc, pdf_doc_event_cb *event_cb, pdf_free_doc_event_data_cb *free_event_data_cb, void *data);
void *pdf_get_doc_event_callback_data(fz_context *ctx, pdf_document *doc);

/*
	The various types of document events
*/

/*
	details of an alert event. In response the app should
	display an alert dialog with the buttons specified by "button_type_group".
	If "check_box_message" is non-NULL, a checkbox should be displayed in
	the lower-left corned along with the message.

	"finally_checked" and "button_pressed" should be set by the app
	before returning from the callback. "finally_checked" need be set
	only if "check_box_message" is non-NULL.
*/
typedef struct
{
	pdf_document *doc;
	const char *message;
	int icon_type;
	int button_group_type;
	const char *title;
	int has_check_box;
	const char *check_box_message;
	int initially_checked;
	int finally_checked;
	int button_pressed;
} pdf_alert_event;

/* Possible values of icon_type */
enum
{
	PDF_ALERT_ICON_ERROR,
	PDF_ALERT_ICON_WARNING,
	PDF_ALERT_ICON_QUESTION,
	PDF_ALERT_ICON_STATUS
};

/* Possible values of button_group_type */
enum
{
	PDF_ALERT_BUTTON_GROUP_OK,
	PDF_ALERT_BUTTON_GROUP_OK_CANCEL,
	PDF_ALERT_BUTTON_GROUP_YES_NO,
	PDF_ALERT_BUTTON_GROUP_YES_NO_CANCEL
};

/* Possible values of button_pressed */
enum
{
	PDF_ALERT_BUTTON_NONE,
	PDF_ALERT_BUTTON_OK,
	PDF_ALERT_BUTTON_CANCEL,
	PDF_ALERT_BUTTON_NO,
	PDF_ALERT_BUTTON_YES
};

/*
	access the details of an alert event
	The returned pointer and all the data referred to by the
	structure are owned by mupdf and need not be freed by the
	caller.
*/
pdf_alert_event *pdf_access_alert_event(fz_context *ctx, pdf_doc_event *evt);

/*
	access the details of am execMenuItem
	event, which consists of just the name of the menu item
*/
const char *pdf_access_exec_menu_item_event(fz_context *ctx, pdf_doc_event *evt);

/*
	details of a launch-url event. The app should
	open the url, either in a new frame or in the current window.
*/
typedef struct
{
	const char *url;
	int new_frame;
} pdf_launch_url_event;

/*
	access the details of a launch-url
	event. The returned pointer and all data referred to by the structure
	are owned by mupdf and need not be freed by the caller.
*/
pdf_launch_url_event *pdf_access_launch_url_event(fz_context *ctx, pdf_doc_event *evt);

/*
	details of a mail_doc event. The app should save
	the current state of the document and email it using the specified
	parameters.
*/
typedef struct
{
	int ask_user;
	const char *to;
	const char *cc;
	const char *bcc;
	const char *subject;
	const char *message;
} pdf_mail_doc_event;

pdf_mail_doc_event *pdf_access_mail_doc_event(fz_context *ctx, pdf_doc_event *evt);

void pdf_event_issue_alert(fz_context *ctx, pdf_document *doc, pdf_alert_event *evt);
void pdf_event_issue_print(fz_context *ctx, pdf_document *doc);
void pdf_event_issue_exec_menu_item(fz_context *ctx, pdf_document *doc, const char *item);
void pdf_event_issue_launch_url(fz_context *ctx, pdf_document *doc, const char *url, int new_frame);
void pdf_event_issue_mail_doc(fz_context *ctx, pdf_document *doc, pdf_mail_doc_event *evt);

#endif