netsurf/riscos/help.c

/*
 * This file is part of NetSurf, http://netsurf.sourceforge.net/
 * Licensed under the GNU General Public License,
 *		  http://www.opensource.org/licenses/gpl-license
 * Copyright 2004 Richard Wilson <not_ginger_matt@users.sourceforge.net>
 */

/** \file
 * Interactive help (implementation).
 */

#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "oslib/help.h"
#include "oslib/os.h"
#include "oslib/taskmanager.h"
#include "oslib/wimp.h"
#include "netsurf/riscos/gui.h"
#include "netsurf/riscos/help.h"
#include "netsurf/utils/messages.h"
#include "netsurf/utils/log.h"


/*	Recognised help keys
	====================

	HelpIconbar	 Iconbar (no icon suffix is used)

	HelpAppInfo	 Application info window
	HelpBrowser	 Browser window
	HelpHistory	 History window
	HelpObjInfo	 Object info window
	HelpPageInfo	 Page info window
	HelpSaveAs	 Save as window
	HelpScaleView	 Scale view window
	HelpStatus	 Status window
	HelpToolbar	 Toolbar window

	HelpIconMenu	 Iconbar menu
	HelpBrowserMenu  Browser window menu

	The prefixes are followed by either the icon number (eg 'HelpToolbar7'), or a series
	of numbers representing the menu structure (eg 'HelpBrowserMenu3-1-2').
	If '<key><identifier>' is not available, then simply '<key>' is then used. For example
	if 'HelpToolbar7' is not available then 'HelpToolbar' is then tried.
*/

static void ro_gui_interactive_help_broadcast(wimp_message *message, char *token);
static os_t help_time = 0;

/**
 * Attempts to process an interactive help message request
 *
 * \param  message the request message
 */
void ro_gui_interactive_help_request(wimp_message *message) {
	char message_token[32];
	char menu_buffer[4];
	wimp_selection menu_tree;
	help_full_message_request *message_data;
	wimp_w window;
	wimp_i icon;
	gui_window *g;
	unsigned int index;

	/*	Ensure we have a help request
	*/
	if ((!message) || (message->action != message_HELP_REQUEST)) return;
	
	/*	Remember the time of the request
	*/
	xos_read_monotonic_time(&help_time);

	/*	Initialise the basic token to a null byte
	*/
	message_token[0] = 0x00;

	/*	Get the message data
	*/
	message_data = (help_full_message_request *)message;
	window = message_data->w;
	icon = message_data->i;

	/*	Do the basic window checks
	*/
	if (window == (wimp_w)-2) {
		sprintf(message_token, "HelpIconbar");
	} else if (window == dialog_info) {
		sprintf(message_token, "HelpAppInfo%i", (int)icon);
	} else if (window == history_window) {
		sprintf(message_token, "HelpHistory%i", (int)icon);
	} else if (window == dialog_objinfo) {
		sprintf(message_token, "HelpObjInfo%i", (int)icon);
	} else if (window == dialog_pageinfo) {
		sprintf(message_token, "HelpPageInfo%i", (int)icon);
	} else if (window == dialog_saveas) {
		sprintf(message_token, "HelpSaveAs%i", (int)icon);
	} else if (window == dialog_zoom) {
		sprintf(message_token, "HelpScaleView%i", (int)icon);
	} else {

		/*	Check if we have a browser window, toolbar window or status window
		*/
		g = ro_gui_window_lookup(window);
		if (g) {
			if (g->window == window) {
				sprintf(message_token, "HelpBrowser%i", (int)icon);
			} else if ((g->data.browser.toolbar) &&
						(g->data.browser.toolbar->toolbar_handle == window))	{
				sprintf(message_token, "HelpToolbar%i", (int)icon);
			} else if ((g->data.browser.toolbar) &&
						(g->data.browser.toolbar->status_handle == window)) {
				sprintf(message_token, "HelpStatus%i", (int)icon);
			}
		}
	}

	/*	If we've managed to find something so far then we broadcast it
	*/
	if (message_token[0] != 0x00) {
		ro_gui_interactive_help_broadcast(message, &message_token[0]);
		return;
	}

	/*	If we are not on an icon, we can't be in a menu (which stops separators
		giving help for their parent) so we abort. You don't even want to think
		about the awful hack I was considering before I realised this...
	*/
	if (icon == (wimp_i)-1) return;

	/*	As a last resort, check for menu help.
	*/
	if (xwimp_get_menu_state((wimp_menu_state_flags)1,
				&menu_tree,
				window, icon)) return;
	if (menu_tree.items[0] == -1) return;

	/*	Set the prefix
	*/
	if (current_menu == iconbar_menu) {
		sprintf(message_token, "HelpIconMenu");
	} else if (current_menu == browser_menu) {
		sprintf(message_token, "HelpBrowserMenu");
	} else {
		return;
	}

	/*	Decode the menu
	*/
	index = 0;
	while (menu_tree.items[index] != -1) {
		if (index == 0) {
			sprintf(menu_buffer, "%i", menu_tree.items[index]);
		} else {
			sprintf(menu_buffer, "-%i", menu_tree.items[index]);
		}
		strcat(message_token, menu_buffer);
		index++;
	}

	/*	Finally, broadcast the menu help
	*/
	ro_gui_interactive_help_broadcast(message, &message_token[0]);
}


/**
 * Broadcasts a help reply
 *
 * \param  message the original request message
 * \param  token the token to look up
 */
static void ro_gui_interactive_help_broadcast(wimp_message *message, char *token) {
	char *translated_token;
	help_full_message_reply *reply;

	/*	Check if the message exists
	*/
	translated_token = (char *)messages_get(token);
	if (translated_token == token) {
		char *base_token;

		/*	Find the key from the token.
		*/
		base_token = translated_token;
		while (base_token[0] != 0x00) {
			if ((base_token[0] == '-') ||
					((base_token[0] >= '0') && (base_token[0] <= '9'))) {
				base_token[0] = 0x00;
			} else {
				++base_token;
			}
		}

		/*	Check if the base key exists
		*/
		translated_token = (char *)messages_get(token);
		if (translated_token == token) return;
	}

	/*	Copy our message string
	*/
	reply = (help_full_message_reply *)message;
	reply->reply[235] = 0;
	strncpy(reply->reply, translated_token, 235);

	/*	Broadcast the help reply
	*/
	reply->size = 256;
	reply->action = message_HELP_REPLY;
	reply->your_ref = reply->my_ref;
	wimp_send_message(wimp_USER_MESSAGE, (wimp_message *)reply, reply->sender);
}


/**
 * Checks if interactive help is running
 *
 * \return non-zero if interactive help is available, or 0 if not available
 */
int ro_gui_interactive_help_available() {
	taskmanager_task task;
	int context = 0;
	char *end;
	os_t time;
	
	/*	Check if we've received a help request in the last 0.5s to test for generic
		interactive help applications
	*/
	xos_read_monotonic_time(&time);
	if ((help_time + 50) > time) return true;

	/*	Attempt to find the task 'Help'
	*/
	do {
		if (xtaskmanager_enumerate_tasks(context, &task, sizeof(taskmanager_task),
					&context, &end)) return 0;

		/*	We can't just use strcmp due to string termination issues.
		*/
		if (strncmp(task.name, "Help", 4) == 0) {
		  	if (task.name[4] < 32) return true;
		}
	} while (context >= 0);

	/*	Return failure
	*/
	return 0;
}