/*
 * 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 2003 Phil Mellor <monkeyson@users.sourceforge.net>
 * Copyright 2004 James Bursa <bursa@users.sourceforge.net>
 * Copyright 2003 John M Bell <jmb202@ecs.soton.ac.uk>
 * Copyright 2004 Andrew Timmins <atimmins@blueyonder.co.uk>
 * Copyright 2005 Richard Wilson <info@tinct.net>
 * Copyright 2005 Adrian Lees <adrianl@users.sourceforge.net>
 */

/** \file
 * Browser window handling (implementation).
 */

#include <assert.h>
#include <ctype.h>
#include <math.h>
#include <stdio.h>
#include <stdbool.h>
#include <time.h>
#include <string.h>
#include "oslib/colourtrans.h"
#include "oslib/osbyte.h"
#include "oslib/osfile.h"
#include "oslib/osspriteop.h"
#include "oslib/wimp.h"
#include "oslib/wimpspriteop.h"
#include "netsurf/utils/config.h"
#include "netsurf/content/content.h"
#include "netsurf/content/urldb.h"
#include "netsurf/css/css.h"
#include "netsurf/desktop/browser.h"
#include "netsurf/desktop/knockout.h"
#include "netsurf/desktop/plotters.h"
#include "netsurf/desktop/textinput.h"
#include "netsurf/desktop/tree.h"
#include "netsurf/desktop/gui.h"
#include "netsurf/render/box.h"
#include "netsurf/render/form.h"
#include "netsurf/riscos/bitmap.h"
#include "netsurf/riscos/buffer.h"
#include "netsurf/riscos/dialog.h"
#include "netsurf/riscos/global_history.h"
#include "netsurf/riscos/gui.h"
#include "netsurf/riscos/menus.h"
#include "netsurf/riscos/options.h"
#include "netsurf/riscos/save.h"
#include "netsurf/riscos/theme.h"
#include "netsurf/riscos/thumbnail.h"
#include "netsurf/riscos/url_complete.h"
#include "netsurf/riscos/wimp.h"
#include "netsurf/riscos/wimp_event.h"
#include "netsurf/utils/log.h"
#include "netsurf/utils/talloc.h"
#include "netsurf/utils/url.h"
#include "netsurf/utils/utf8.h"
#include "netsurf/utils/utils.h"
#include "netsurf/utils/messages.h"

#ifndef wimp_KEY_END
#define wimp_KEY_END wimp_KEY_COPY
#endif

#define SCROLL_VISIBLE_PADDING 32

/** Remembers which iconised sprite numbers are in use */
static bool iconise_used[64];
static int iconise_next = 0;

/** List of all browser windows. */
static struct gui_window *window_list = 0;
/** GUI window which is being redrawn. Valid only during redraw. */
struct gui_window *ro_gui_current_redraw_gui;

static float scale_snap_to[] = {0.10, 0.125, 0.25, 0.333, 0.5, 0.75,
				1.0,
				1.5, 2.0, 3.0, 4.0, 6.0, 8.0, 12.0, 16.0};
#define SCALE_SNAP_TO_SIZE (sizeof scale_snap_to) / (sizeof(float))

static bool ro_gui_window_click(wimp_pointer *mouse);
static bool ro_gui_window_keypress(wimp_key *key);
static void ro_gui_window_launch_url(struct gui_window *g, const char *url);
static void ro_gui_window_clone_options(struct browser_window *new_bw,
		struct browser_window *old_bw);
static browser_mouse_state ro_gui_mouse_drag_state(wimp_mouse_state buttons);
static bool ro_gui_window_import_text(struct gui_window *g, const char *filename,
		bool toolbar);

struct update_box {
	int x0;
	int y0;
	int x1;
	int y1;
	bool use_buffer;
	struct gui_window *g;
	union content_msg_data data;
	struct update_box *next;
};

struct update_box *pending_updates;
#define MARGIN 4

/**
 * Create and open a new browser window.
 *
 * \param  bw	  browser_window structure to update
 * \param  clone  the browser window to clone options from, or NULL for default
 * \return  gui_window, or 0 on error and error reported
 */

struct gui_window *gui_create_browser_window(struct browser_window *bw,
		struct browser_window *clone)
{
	int screen_width, screen_height, win_width, win_height, scroll_width;
	static int window_count = 2;
	wimp_window window;
	wimp_window_state state;
	os_error *error;
	bool open_centred = true;
	struct gui_window *g;
	struct browser_window *top;

	g = malloc(sizeof *g);
	if (!g) {
		warn_user("NoMemory", 0);
		return 0;
	}
	g->bw = bw;
	g->toolbar = 0;
	g->reformat_pending = false;
	g->old_width = 0;
	g->old_height = 0;
	strcpy(g->title, "NetSurf");
	g->throbber = 0;
	g->throbtime = 0;
	g->iconise_icon = -1;

	/*	Set the window position
	*/
	if (bw->parent) {
		/* fill the parent window until it's reformatted */
		state.w = clone->window->window;
		error = xwimp_get_window_state(&state);
		if (error) {
			LOG(("xwimp_get_window_state: 0x%x: %s",
					error->errnum, error->errmess));
			warn_user("WimpError", error->errmess);
		}
		window.visible.x0 = 0;
		window.visible.x1 = 64;
		window.visible.y0 = 0;
		window.visible.y1 = 64;
		open_centred = false;
	} else if (clone && clone->window && option_window_size_clone) {
		state.w = clone->window->window;
		error = xwimp_get_window_state(&state);
		if (error) {
			LOG(("xwimp_get_window_state: 0x%x: %s",
					error->errnum, error->errmess));
			warn_user("WimpError", error->errmess);
		}
		window.visible.x0 = state.visible.x0;
		window.visible.x1 = state.visible.x1;
		window.visible.y0 = state.visible.y0 - 48;
		window.visible.y1 = state.visible.y1 - 48;
		open_centred = false;
	} else {
		ro_gui_screen_size(&screen_width, &screen_height);

		/*	Check if we have a preferred position
		*/
		if ((option_window_screen_width != 0) &&
				(option_window_screen_height != 0)) {
			win_width = (option_window_width * screen_width) /
					option_window_screen_width;
			win_height = (option_window_height * screen_height) /
					option_window_screen_height;
			window.visible.x0 = (option_window_x * screen_width) /
					option_window_screen_width;
			window.visible.y0 = (option_window_y * screen_height) /
					option_window_screen_height;
			if (option_window_stagger) {
				window.visible.y0 += 96 -
						(48 * (window_count % 5));
			}
			open_centred = false;
			if (win_width < 100)
				win_width = 100;
			if (win_height < 100)
				win_height = 100;
		} else {

		       /* Base how we define the window height/width
		       on the compile time options set */
			win_width = screen_width * 3 / 4;
			if (1600 < win_width)
				win_width = 1600;
			win_height = win_width * 3 / 4;

			window.visible.x0 = (screen_width - win_width) / 2;
			window.visible.y0 = ((screen_height - win_height) / 2) +
					96 - (48 * (window_count % 5));
		}
		window.visible.x1 = window.visible.x0 + win_width;
		window.visible.y1 = window.visible.y0 + win_height;
	}

	/*	Set the general window characteristics
	*/
	window.xscroll = 0;
	window.yscroll = 0;
	window.next = wimp_TOP;
	
	/* General flags for a non-movable, non-resizable, no-title bar window */
	window.flags =	wimp_WINDOW_MOVEABLE |
			wimp_WINDOW_NEW_FORMAT |
			wimp_WINDOW_VSCROLL |
			wimp_WINDOW_HSCROLL |
			wimp_WINDOW_IGNORE_XEXTENT |
			wimp_WINDOW_IGNORE_YEXTENT |
			wimp_WINDOW_SCROLL_REPEAT;
	window.title_fg = wimp_COLOUR_BLACK;
	window.title_bg = wimp_COLOUR_LIGHT_GREY;
	window.work_fg = wimp_COLOUR_LIGHT_GREY;
	window.work_bg = wimp_COLOUR_TRANSPARENT;
	window.scroll_outer = wimp_COLOUR_DARK_GREY;
	window.scroll_inner = wimp_COLOUR_MID_LIGHT_GREY;
	window.highlight_bg = wimp_COLOUR_CREAM;
	window.extra_flags = 0;
	window.extent.x0 = 0;
	window.extent.y0 = window.visible.y1 - window.visible.y0;
	window.extent.x1 = window.visible.x1 - window.visible.x0;
	window.extent.y1 = 0;
	window.title_flags = wimp_ICON_TEXT |
			wimp_ICON_INDIRECTED |
			wimp_ICON_HCENTRED;
	window.work_flags = wimp_BUTTON_CLICK_DRAG <<
			wimp_ICON_BUTTON_TYPE_SHIFT;
	window.sprite_area = wimpspriteop_AREA;
	window.xmin = 1;
	window.ymin = 1;
	window.title_data.indirected_text.text = g->title;
	window.title_data.indirected_text.validation = (char *) -1;
	window.title_data.indirected_text.size = 255;
	window.icon_count = 0;

	/* Add in flags for our window type */
	switch (bw->browser_window_type) {
		case BROWSER_WINDOW_FRAMESET:
			window.flags &= ~(wimp_WINDOW_VSCROLL |
					wimp_WINDOW_HSCROLL);
			window.title_fg = 0xff;
			break;
		case BROWSER_WINDOW_FRAME:
		case BROWSER_WINDOW_IFRAME:
			if (bw->scrolling == SCROLLING_NO)
				window.flags &= ~(wimp_WINDOW_VSCROLL |
						wimp_WINDOW_HSCROLL);
			if (!bw->border)
				window.title_fg = 0xff;
			else {
				/* set the correct border colour */
				unsigned int col;
				col = bw->border_colour & 0xffffff;
				sprintf(g->validation, "C%.6x", col);
			  	window.extra_flags |= wimp_WINDOW_USE_TITLE_VALIDATION_STRING;
				window.title_data.indirected_text.validation = g->validation;
			}
			break;
		case BROWSER_WINDOW_NORMAL:
			window.flags |=	wimp_WINDOW_SIZE_ICON |
					wimp_WINDOW_BACK_ICON |
					wimp_WINDOW_CLOSE_ICON |
					wimp_WINDOW_TITLE_ICON |
					wimp_WINDOW_TOGGLE_ICON;		
			break;
	}

	if (open_centred) {
		scroll_width = ro_get_vscroll_width(NULL);
		window.visible.x0 -= scroll_width;
	}

	error = xwimp_create_window(&window, &g->window);
	if (error) {
		LOG(("xwimp_create_window: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		free(g);
		return 0;
	}

	g->prev = 0;
	g->next = window_list;
	if (window_list)
		window_list->prev = g;
	window_list = g;
	window_count++;

	/*	Add in a toolbar
	*/
	if (bw->browser_window_type == BROWSER_WINDOW_NORMAL) {
		g->toolbar = ro_gui_theme_create_toolbar(NULL, THEME_BROWSER_TOOLBAR);
		ro_gui_theme_attach_toolbar(g->toolbar, g->window);
	} else {
		g->toolbar = NULL;
	}

	/*	Set the window options
	*/
	bw->window = g;
	ro_gui_window_clone_options(bw, clone);
	ro_gui_prepare_navigate(g);

	/*	Open the window
	*/
	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return g;
	}

	/*	Open the window at the top/back of the stack
	*/
	if (bw->browser_window_type == BROWSER_WINDOW_NORMAL)
		state.next = wimp_TOP;
	else
		state.next = wimp_HIDDEN;
	if (bw->parent) {
	  	top = browser_window_owner(bw);
		error = xwimp_open_window_nested((wimp_open *)&state, top->window->window,
				wimp_CHILD_LINKS_PARENT_WORK_AREA
						<< wimp_CHILD_XORIGIN_SHIFT |
				wimp_CHILD_LINKS_PARENT_WORK_AREA
						<< wimp_CHILD_YORIGIN_SHIFT);
	}
	ro_gui_window_open(g, (wimp_open*)&state);

	/*	Set the caret position to the URL bar
	*/
	if (g->toolbar && g->toolbar->display_url) {
		error = xwimp_set_caret_position(
				g->toolbar->toolbar_handle,
				ICON_TOOLBAR_URL, -1, -1, -1, 0);
		ro_gui_url_complete_start(g);
	} else
		error = xwimp_set_caret_position(g->window,
				wimp_ICON_WINDOW, -100, -100, 32, -1);

	if (error) {
		LOG(("xwimp_set_caret_position: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return g;
	}

	/* and register event handlers */
	ro_gui_wimp_event_register_keypress(g->window,
			ro_gui_window_keypress);
	if (g->toolbar)
		ro_gui_wimp_event_register_keypress(g->toolbar->toolbar_handle,
				ro_gui_window_keypress);
	ro_gui_wimp_event_register_mouse_click(g->window,
			ro_gui_window_click);

	return g;
}


/**
 * Close a browser window and free any related resources.
 *
 * \param  g  gui_window to destroy
 */

void gui_window_destroy(struct gui_window *g)
{
	os_error *error;

	assert(g);

	/* remove from list */
	if (g->prev)
		g->prev->next = g->next;
	else
		window_list = g->next;
	if (g->next)
		g->next->prev = g->prev;

	if (g->toolbar)
		ro_gui_theme_destroy_toolbar(g->toolbar);

	/* delete window */
	error = xwimp_delete_window(g->window);
	if (error) {
		LOG(("xwimp_delete_window: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
	}

	free(g);
}


/**
 * Destroy all browser windows.
 */

void ro_gui_window_quit(void)
{
  	struct gui_window *cur;
	
	while (window_list) {
	  	cur = window_list;
	  	window_list = window_list->next;

		/* framesets and iframes are destroyed by their parents */
		if (!cur->bw->parent) 
			browser_window_destroy(cur->bw);
	}
}


/**
 * Set the title of a browser window.
 *
 * \param  g	  gui_window to update
 * \param  title  new window title, copied
 */

void gui_window_set_title(struct gui_window *g, const char *title)
{
	int scale_disp;

	assert(g);
	assert(title);

	if (g->option.scale != 1.0) {
		scale_disp = g->option.scale * 100;
		if (ABS((float)scale_disp - g->option.scale * 100) >= 0.05)
			snprintf(g->title, sizeof g->title, "%s (%.1f%%)", title,
					g->option.scale * 100);
		else
			snprintf(g->title, sizeof g->title, "%s (%i%%)", title, scale_disp);
	} else {
		strncpy(g->title, title, sizeof g->title);
	}

	/* only top-level parents have titlebars */
	if (!g->bw->parent)
		ro_gui_set_window_title(g->window, g->title);
}


/**
 * Save the specified content as a link.
 *
 * \param  g  gui_window containing the content
 * \param  c  the content to save
 */

void gui_window_save_as_link(struct gui_window *g, struct content *c)
{
	if (!c)
		return;
	ro_gui_save_prepare(GUI_SAVE_LINK_URL, c);
	ro_gui_dialog_open_persistent(g->window, dialog_saveas, true);
}


/**
 * Force a redraw of part of the contents of a browser window.
 *
 * \param  g   gui_window to redraw
 * \param  x0  rectangle to redraw
 * \param  y0  rectangle to redraw
 * \param  x1  rectangle to redraw
 * \param  y1  rectangle to redraw
 */

void gui_window_redraw(struct gui_window *g, int x0, int y0, int x1, int y1)
{
	os_error *error;

	assert(g);

	error = xwimp_force_redraw(g->window, x0 * 2, -y1 * 2, x1 * 2, -y0 * 2);
	if (error) {
		LOG(("xwimp_force_redraw: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
	}
}


/**
 * Redraws the content for all windows.
 */

void ro_gui_window_redraw_all(void)
{
	struct gui_window *g;
	for (g = window_list; g; g = g->next)
		gui_window_redraw_window(g);
}


/**
 * Force a redraw of the entire contents of a browser window.
 *
 * \param  g   gui_window to redraw
 */

void gui_window_redraw_window(struct gui_window *g)
{
	wimp_window_info info;
	os_error *error;

	assert(g);

	info.w = g->window;
	error = xwimp_get_window_info_header_only(&info);
	if (error) {
		LOG(("xwimp_get_window_info_header_only: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}

	error = xwimp_force_redraw(g->window, info.extent.x0, info.extent.y0,
			info.extent.x1, info.extent.y1);
	if (error) {
		LOG(("xwimp_force_redraw: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
	}
}


/**
 * Handle a Redraw_Window_Request for a browser window.
 */

void ro_gui_window_redraw(struct gui_window *g, wimp_draw *redraw)
{
	osbool more;
	bool knockout = true;
	float scale = g->option.scale;
	struct content *c = g->bw->current_content;
	int clip_x0, clip_y0, clip_x1, clip_y1, clear_x1, clear_y1;
	os_error *error;

	/*	Handle no content quickly
	*/
	if (!c) {
		ro_gui_user_redraw(redraw, true, os_COLOUR_WHITE);
		return;
	}

	plot = ro_plotters;
	ro_plot_set_scale(scale);
	ro_gui_current_redraw_gui = g;
	current_redraw_browser = g->bw;

	/* rendering textplain has no advantages using knockout rendering other than to
	 * slow things down. */
	if (c->type == CONTENT_TEXTPLAIN)
		knockout = false;

	/* HTML rendering handles scale itself */
	if (c->type == CONTENT_HTML)
		scale = 1;

	error = xwimp_redraw_window(redraw, &more);
	if (error) {
		LOG(("xwimp_redraw_window: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}
	while (more) {
		ro_plot_origin_x = redraw->box.x0 - redraw->xscroll;
		ro_plot_origin_y = redraw->box.y1 - redraw->yscroll;
		clip_x0 = (redraw->clip.x0 - ro_plot_origin_x) / 2;
		clip_y0 = (ro_plot_origin_y - redraw->clip.y1) / 2;
		clip_x1 = (redraw->clip.x1 - ro_plot_origin_x) / 2;
		clip_y1 = (ro_plot_origin_y - redraw->clip.y0) / 2;
		clear_x1 = redraw->clip.x1 - ro_plot_origin_x;
		clear_y1 = redraw->clip.y0 - ro_plot_origin_y;

		if (ro_gui_current_redraw_gui->option.buffer_everything)
			ro_gui_buffer_open(redraw);

		if (knockout) {
			knockout_plot_start(&plot);
			plot.clip(clip_x0, clip_y0, clip_x1, clip_y1);
			plot.clg(0x00ffffff);
		}

		content_redraw(c, 0, 0,
				c->width * scale, c->height * scale,
				clip_x0, clip_y0, clip_x1, clip_y1,
				g->option.scale,
				0xFFFFFF);
		if (knockout)
			knockout_plot_end();
		if (ro_gui_current_redraw_gui->option.buffer_everything)
			ro_gui_buffer_close();

		error = xwimp_get_rectangle(redraw, &more);
		/* RISC OS 3.7 returns an error here if enough buffer was
		   claimed to cause a new dynamic area to be created. It
		   doesn't actually stop anything working, so we mask it out
		   for now until a better fix is found. This appears to be a
		   bug in RISC OS. */
		if (error && !(ro_gui_current_redraw_gui->
				option.buffer_everything &&
				error->errnum == error_WIMP_GET_RECT)) {
			LOG(("xwimp_get_rectangle: 0x%x: %s",
					error->errnum, error->errmess));
			warn_user("WimpError", error->errmess);
			ro_gui_current_redraw_gui = NULL;
			current_redraw_browser = NULL;
			return;
		}
	}
	ro_gui_current_redraw_gui = NULL;
	current_redraw_browser = NULL;
}


/**
 * Redraw any pending update boxes.
 */
void ro_gui_window_update_boxes(void) {
	struct content *c;
	osbool more;
	bool clear_background = false;
	bool use_buffer;
	wimp_draw update;
	int clip_x0, clip_y0, clip_x1, clip_y1;
	os_error *error;
	struct update_box *cur;
	struct gui_window *g;
	const union content_msg_data *data;

	for (cur = pending_updates; cur != NULL; cur = cur->next) {
		g = cur->g;
		c = g->bw->current_content;
		data = &cur->data;
		use_buffer = cur->use_buffer;
		if (!c)
			continue;

		update.w = g->window;
		update.box.x0 = cur->x0;
		update.box.y0 = cur->y0;
		update.box.x1 = cur->x1;
		update.box.y1 = cur->y1;

		error = xwimp_update_window(&update, &more);
		if (error) {
			LOG(("xwimp_update_window: 0x%x: %s",
					error->errnum, error->errmess));
			warn_user("WimpError", error->errmess);
			continue;
		}

		/*	Set the current redraw gui_window to get options from
		*/
		ro_gui_current_redraw_gui = g;
		current_redraw_browser = g->bw;

		plot = ro_plotters;
		ro_plot_origin_x = update.box.x0 - update.xscroll;
		ro_plot_origin_y = update.box.y1 - update.yscroll;
		ro_plot_set_scale(g->option.scale);

		/*	We should clear the background, except for HTML.
		*/
		if (c->type != CONTENT_HTML)
			clear_background = true;

		while (more) {
			clip_x0 = (update.clip.x0 - ro_plot_origin_x) / 2;
			clip_y0 = (ro_plot_origin_y - update.clip.y1) / 2;
			clip_x1 = (update.clip.x1 - ro_plot_origin_x) / 2;
			clip_y1 = (ro_plot_origin_y - update.clip.y0) / 2;

			if (use_buffer)
				ro_gui_buffer_open(&update);
			if (data->redraw.full_redraw) {
				if (clear_background) {
					error = xcolourtrans_set_gcol(os_COLOUR_WHITE,
							colourtrans_SET_BG,
							os_ACTION_OVERWRITE, 0, 0);
					if (error) {
						LOG(("xcolourtrans_set_gcol: 0x%x: %s",
								error->errnum,
								error->errmess));
						warn_user("MiscError", error->errmess);
					}
					os_clg();
				}

				content_redraw(c, 0, 0,
						c->width, c->height,
						clip_x0, clip_y0, clip_x1, clip_y1,
						g->option.scale,
						0xFFFFFF);
			} else {
				assert(data->redraw.object);
				content_redraw(data->redraw.object,
						floorf(data->redraw.object_x *
							g->option.scale),
						ceilf(data->redraw.object_y *
							g->option.scale),
						data->redraw.object_width *
							g->option.scale,
						data->redraw.object_height *
							g->option.scale,
						clip_x0, clip_y0, clip_x1, clip_y1,
						g->option.scale,
						0xFFFFFF);
			}

			if (use_buffer)
				ro_gui_buffer_close();
			error = xwimp_get_rectangle(&update, &more);
			/* RISC OS 3.7 returns an error here if enough buffer was
			   claimed to cause a new dynamic area to be created. It
			   doesn't actually stop anything working, so we mask it out
			   for now until a better fix is found. This appears to be a
			   bug in RISC OS. */
			if (error && !(use_buffer &&
					error->errnum == error_WIMP_GET_RECT)) {
				LOG(("xwimp_get_rectangle: 0x%x: %s",
						error->errnum, error->errmess));
				warn_user("WimpError", error->errmess);
				ro_gui_current_redraw_gui = NULL;
				current_redraw_browser = NULL;
				continue;
			}
		}

		/*	Reset the current redraw gui_window to prevent thumbnails from
			retaining options
		*/
		ro_gui_current_redraw_gui = NULL;
		current_redraw_browser = NULL;
	}
	while (pending_updates) {
		cur = pending_updates;
		pending_updates = pending_updates->next;
		free(cur);
	}

}
/**
 * Redraw an area of a window.
 *
 * \param  g   gui_window
 * \param  data  content_msg_data union with filled in redraw data
 */

void gui_window_update_box(struct gui_window *g,
		const union content_msg_data *data)
{
	struct content *c = g->bw->current_content;
	bool use_buffer;
	int x0, y0, x1, y1;
	struct update_box *cur;

	if (!c)
		return;

	x0 = floorf(data->redraw.x * 2 * g->option.scale);
	y0 = -ceilf((data->redraw.y + data->redraw.height) * 2 * g->option.scale);
	x1 = ceilf((data->redraw.x + data->redraw.width) * 2 * g->option.scale) + 1;
	y1 = -floorf(data->redraw.y * 2 * g->option.scale) + 1;
	use_buffer = (data->redraw.full_redraw) &&
		(g->option.buffer_everything || g->option.buffer_animations);

	/* try to optimise buffered redraws */
	if (use_buffer) {
		for (cur = pending_updates; cur != NULL; cur = cur->next) {
			if ((cur->g != g) || (!cur->use_buffer))
				continue;
			if ((((cur->x0 - x1) < MARGIN) || ((cur->x1 - x0) < MARGIN)) &&
					(((cur->y0 - y1) < MARGIN) || ((cur->y1 - y0) < MARGIN))) {
				cur->x0 = min(cur->x0, x0);
				cur->y0 = min(cur->y0, y0);
				cur->x1 = max(cur->x1, x1);
				cur->y1 = max(cur->y1, y1);
				return;
			}

		}
	}
	cur = malloc(sizeof(struct update_box));
	if (!cur) {
		LOG(("No memory for malloc."));
		warn_user("NoMemory", 0);
		return;
	}
	cur->x0 = x0;
	cur->y0 = y0;
	cur->x1 = x1;
	cur->y1 = y1;
	cur->next = pending_updates;
	pending_updates = cur;
	cur->g = g;
	cur->use_buffer = use_buffer;
	cur->data = *data;
}


/**
 * Get the scroll position of a browser window.
 *
 * \param  g   gui_window
 * \param  sx  receives x ordinate of point at top-left of window
 * \param  sy  receives y ordinate of point at top-left of window
 * \return true iff successful
 */

bool gui_window_get_scroll(struct gui_window *g, int *sx, int *sy)
{
	wimp_window_state state;
	os_error *error;

	assert(g);

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}
	else {
		int toolbar_height = 0;

		if (g->toolbar)
			toolbar_height = ro_gui_theme_toolbar_full_height(g->toolbar);

		*sx = state.xscroll / (2 * g->option.scale);
		*sy = -(state.yscroll - toolbar_height) / (2 * g->option.scale);
		return true;
	}
}


/**
 * Set the scroll position of a browser window.
 *
 * \param  g   gui_window to scroll
 * \param  sx  point to place at top-left of window
 * \param  sy  point to place at top-left of window
 */

void gui_window_set_scroll(struct gui_window *g, int sx, int sy)
{
	wimp_window_state state;
	os_error *error;

	assert(g);

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}

	state.xscroll = sx * 2 * g->option.scale;
	state.yscroll = -sy * 2 * g->option.scale;
	if (g->toolbar)
		state.yscroll += ro_gui_theme_toolbar_full_height(g->toolbar);
	ro_gui_window_open(g, (wimp_open *) &state);
}


/**
 * Scrolls the specified area of a browser window into view.
 *
 * \param  g   gui_window to scroll
 * \param  x0  left point to ensure visible
 * \param  y0  bottom point to ensure visible
 * \param  x1  right point to ensure visible
 * \param  y1  top point to ensure visible
 */
void gui_window_scroll_visible(struct gui_window *g, int x0, int y0, int x1, int y1)
{
	wimp_window_state state;
	os_error *error;
	int cx0, cy0, width, height;
	int padding_available;
	int toolbar_height = 0;
	int correction;

	assert(g);

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}

	if (g->toolbar)
		toolbar_height = ro_gui_theme_toolbar_full_height(g->toolbar);

	x0 = x0 * 2 * g->option.scale;
	y0 = y0 * 2 * g->option.scale;
	x1 = x1 * 2 * g->option.scale;
	y1 = y1 * 2 * g->option.scale;

	cx0 = state.xscroll;
	cy0 = -state.yscroll + toolbar_height;
	width = state.visible.x1 - state.visible.x0;
	height = state.visible.y1 - state.visible.y0 - toolbar_height;

	/* make sure we're visible */
	correction = (x1 - cx0 - width);
	if (correction > 0)
		cx0 += correction;
	correction = (y1 - cy0 - height);
	if (correction > 0)
		cy0 += correction;
	if (x0 < cx0)
		cx0 = x0;
	if (y0 < cy0)
		cy0 = y0;

	/* try to give a SCROLL_VISIBLE_PADDING border of space around us */
	padding_available = (width - x1 + x0) / 2;
	if (padding_available > 0) {
		if (padding_available > SCROLL_VISIBLE_PADDING)
			padding_available = SCROLL_VISIBLE_PADDING;
		correction = (cx0 + width - x1);
		if (correction < padding_available)
			cx0 += padding_available;
		correction = (x0 - cx0);
		if (correction < padding_available)
			cx0 -= padding_available;
	}
	padding_available = (height - y1 + y0) / 2;
	LOG(("Padding available: %i", padding_available));
	if (padding_available > 0) {
		if (padding_available > SCROLL_VISIBLE_PADDING)
			padding_available = SCROLL_VISIBLE_PADDING;
		correction = (cy0 + height - y1);
		if (correction < padding_available)
			cy0 += padding_available;
		correction = (y0 - cy0);
		if (correction < padding_available)
			cy0 -= padding_available;
	}

	state.xscroll = cx0;
	state.yscroll = -cy0 + toolbar_height;
	ro_gui_window_open(g, (wimp_open *)&state);
}


/**
 * Opens a frame at a specified position.
 *
 * \param  g   child gui_window to open
 * \param  x0  left point to open at
 * \param  y0  bottom point to open at
 * \param  x1  right point to open at
 * \param  y1  top point to open at
 */
void gui_window_position_frame(struct gui_window *g, int x0, int y0, int x1, int y1)
{
	wimp_window_state state;
	os_error *error;
	int px0, py1;
	int toolbar_height = 0;
	struct browser_window *bw;
	struct browser_window *parent;
	struct browser_window *top;

	assert(g);
	bw = g->bw;
	assert(bw);
	parent = bw->parent;
	assert(parent);
	top = browser_window_owner(bw);
	
	/* store position for children */
	if (parent->browser_window_type == BROWSER_WINDOW_IFRAME) {
		x0 = bw->x0 = x0;
		y0 = bw->y0 = y0;
		x1 = bw->x1 = x1;
		y1 = bw->y1 = y1;
	} else {
		x0 = bw->x0 = parent->x0 + x0;
		y0 = bw->y0 = parent->y0 + y0;
		x1 = bw->x1 = parent->x0 + x1;
		y1 = bw->y1 = parent->y0 + y1;
	}

	/* get the position of the top level window */
	state.w = top->window->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}
	if (top->window->toolbar)
		toolbar_height = ro_gui_theme_toolbar_full_height(top->window->toolbar);
	px0 = state.visible.x0;
	py1 = state.visible.y1 - toolbar_height;

	/* get our current window state */
	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}
	if (!g->bw->border) {
		x0 -= 1;
		y0 -= 1;
		x1 += 1;
		y1 += 1;
	}

	x1 *= 2;
	y1 *= 2;

	/* scrollbars must go inside */
	if (state.flags & wimp_WINDOW_HSCROLL) {
		y1 -= ro_get_hscroll_height(NULL);
		if (g->bw->border)
			y1 += 2;
	}
	if (state.flags & wimp_WINDOW_VSCROLL) {
		x1 -= ro_get_vscroll_width(NULL);
		if (g->bw->border)
			x1 += 2;
	}
	state.visible.x0 = px0 + x0 * 2;
	state.visible.y0 = py1 - y1;
	state.visible.x1 = px0 + x1;
	state.visible.y1 = py1 - y0 * 2; 

	ro_gui_window_open(g, (wimp_open *)&state);
}


/**
 * Find the current unscaled dimensions of a browser window's content area.
 *
 * \param  g  gui_window to measure
 */

void gui_window_get_dimensions(struct gui_window *g, int *width, int *height)
{
	wimp_window_state state;
	os_error *error;

	/* get the dimensions */
	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		*width = 0;
		*height = 0;
		return;
	}

	*width = (state.visible.x1 - state.visible.x0) / 2;
	*height = (state.visible.y1 - state.visible.y0 - (g->toolbar ?
			ro_gui_theme_toolbar_full_height(g->toolbar) : 0)) / 2;
}


/**
 * Find the current scaled width of a browser window.
 *
 * \param  g  gui_window to measure
 * \return  width of window
 */

int gui_window_get_width(struct gui_window *g)
{
	wimp_window_state state;
	os_error *error;

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return 800;
	}
	return (state.visible.x1 - state.visible.x0) / 2 / g->option.scale;
}


/**
 * Find the current scaled height of a browser window.
 *
 * \param  g  gui_window to measure
 * \return  height of window
 */

int gui_window_get_height(struct gui_window *g)
{
	wimp_window_state state;
	os_error *error;

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return 800;
	}
	return (state.visible.y1 - state.visible.y0 - (g->toolbar ?
			ro_gui_theme_toolbar_full_height(g->toolbar) : 0)) /
			2 / g->option.scale;
}


/**
 * Update the extent of the inside of a browser window to that of the current content.
 *
 * \param  g	   gui_window to resize
 */

void gui_window_update_extent(struct gui_window *g)
{
	ro_gui_window_update_dimensions(g, 0);
}


/**
 * Forces the windows extent to be updated
 *
 * /param g	   the gui window to update
 * /param yscroll  an amount to scroll the vertical scroll bar by
 */
void ro_gui_window_update_dimensions(struct gui_window *g, int yscroll) {
	os_error *error;
	wimp_window_state state;
	bool update;
	unsigned int flags;
	
	if (!g) return;
	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}
	state.yscroll -= yscroll;
	g->old_height = -1;
	
	/* only allow a further reformat if we've gained/lost scrollbars */
	flags = state.flags & (wimp_WINDOW_HSCROLL | wimp_WINDOW_VSCROLL);
	update = g->reformat_pending;
	ro_gui_window_open(g, (wimp_open *)&state);
	
	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}
	if (flags == (state.flags & (wimp_WINDOW_HSCROLL | wimp_WINDOW_VSCROLL)))
		g->reformat_pending = update;
}


/**
 * Set the status bar of a browser window.
 *
 * \param  g	 gui_window to update
 * \param  text  new status text
 */

void gui_window_set_status(struct gui_window *g, const char *text)
{
	if ((!g->toolbar) || (!g->toolbar->status_handle))
		return;

	ro_gui_set_icon_string(g->toolbar->status_handle,
				ICON_STATUS_TEXT, text);
}


/**
 * Set the contents of a window's address bar.
 *
 * \param  g	gui_window to update
 * \param  url  new url for address bar
 */

void gui_window_set_url(struct gui_window *g, const char *url)
{
	wimp_caret caret;
	os_error *error;
	char *toolbar_url;

	if (!g->toolbar)
		return;

	ro_gui_set_icon_string(g->toolbar->toolbar_handle,
			ICON_TOOLBAR_URL, url);
	ro_gui_force_redraw_icon(g->toolbar->toolbar_handle,
			ICON_TOOLBAR_FAVICON);

	/* if the caret is in the address bar, move it to the end */
	error = xwimp_get_caret_position(&caret);
	if (error) {
		LOG(("xwimp_get_caret_position: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}

	if (!(caret.w == g->toolbar->toolbar_handle &&
			caret.i == ICON_TOOLBAR_URL))
		return;

	toolbar_url = ro_gui_get_icon_string(g->toolbar->toolbar_handle,
			ICON_TOOLBAR_URL);
	error = xwimp_set_caret_position(g->toolbar->toolbar_handle,
			ICON_TOOLBAR_URL, 0, 0, -1, (int)strlen(toolbar_url));
	if (error) {
		LOG(("xwimp_set_caret_position: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
	}
	ro_gui_url_complete_start(g);
}


/**
 * Launch a new url in the given window.
 *
 * \param  g	gui_window to update
 * \param  url  url to be launched
 */

void ro_gui_window_launch_url(struct gui_window *g, const char *url)
{
	url_func_result res;
	char *url_norm;

	ro_gui_url_complete_close(NULL, 0);
	res = url_normalize(url, &url_norm);
	if (res == URL_FUNC_OK) {
		gui_window_set_url(g, url_norm);
		browser_window_go(g->bw, url_norm, 0, true);
		global_history_add_recent(url_norm);
		free(url_norm);
	}
}


/**
 * Forces all windows to be set to the current theme
 *
 * /param g	   the gui window to update
 */
void ro_gui_window_update_theme(void) {
	int height;
	struct gui_window *g;
	for (g = window_list; g; g = g->next) {
		if (g->toolbar) {
			height = ro_gui_theme_toolbar_height(g->toolbar);
			if (g->toolbar->editor)
				if (!ro_gui_theme_update_toolbar(NULL, g->toolbar->editor))
					g->toolbar->editor = NULL;
			if (!ro_gui_theme_update_toolbar(NULL, g->toolbar)) {
				ro_gui_theme_destroy_toolbar(g->toolbar);
				g->toolbar = NULL;
				if (height != 0)
					ro_gui_window_update_dimensions(g, height);
			} else {
				if (height != (ro_gui_theme_toolbar_height(g->toolbar)))
					ro_gui_window_update_dimensions(g, height -
						ro_gui_theme_toolbar_height(g->toolbar));
			}
			ro_gui_theme_toolbar_editor_sync(g->toolbar);
		}
	}
	if ((hotlist_tree) && (hotlist_tree->toolbar)) {
		if (hotlist_tree->toolbar->editor)
			if (!ro_gui_theme_update_toolbar(NULL, hotlist_tree->toolbar->editor))
				hotlist_tree->toolbar->editor = NULL;
		if (!ro_gui_theme_update_toolbar(NULL, hotlist_tree->toolbar)) {
			ro_gui_theme_destroy_toolbar(hotlist_tree->toolbar);
			hotlist_tree->toolbar = NULL;
		}
		ro_gui_theme_toolbar_editor_sync(hotlist_tree->toolbar);
		ro_gui_theme_attach_toolbar(hotlist_tree->toolbar,
				(wimp_w)hotlist_tree->handle);
		xwimp_force_redraw((wimp_w)hotlist_tree->handle,
				0, -16384, 16384, 16384);
	}
	if ((global_history_tree) && (global_history_tree->toolbar)) {
		if (global_history_tree->toolbar->editor)
			if (!ro_gui_theme_update_toolbar(NULL,
					global_history_tree->toolbar->editor))
				global_history_tree->toolbar->editor = NULL;
		if (!ro_gui_theme_update_toolbar(NULL, global_history_tree->toolbar)) {
			ro_gui_theme_destroy_toolbar(global_history_tree->toolbar);
			global_history_tree->toolbar = NULL;
		}
		ro_gui_theme_toolbar_editor_sync(global_history_tree->toolbar);
		ro_gui_theme_attach_toolbar(global_history_tree->toolbar,
				(wimp_w)global_history_tree->handle);
		xwimp_force_redraw((wimp_w)global_history_tree->handle,
				0, -16384, 16384, 16384);
	}
}

/**
 * Open a window using the given wimp_open, handling toolbars and resizing.
 */

void ro_gui_window_open(struct gui_window *g, wimp_open *open)
{
	int width = open->visible.x1 - open->visible.x0;
	int height = open->visible.y1 - open->visible.y0;
	int toolbar_height = 0;
	struct content *content;
	wimp_window_state state;
	os_error *error;
	int key_down = 0;
	wimp_w parent;
	bits linkage;
	int size;
	bool no_vscroll, no_hscroll;
	int fheight, fwidth;

	if (open->next == wimp_TOP && g->iconise_icon >= 0) {
		/* window is no longer iconised, release its sprite number */
		iconise_used[g->iconise_icon] = false;
		g->iconise_icon = -1;
	}

	content = g->bw->current_content;

	/* get the current flags/nesting state */
	state.w = g->window;
	error = xwimp_get_window_state_and_nesting(&state, &parent, &linkage);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}

	/* account for toolbar height, if present */
	if (g->toolbar)
		toolbar_height = ro_gui_theme_toolbar_full_height(g->toolbar);
	height -= toolbar_height;
	
	/* work with the state from now on so we can modify flags */
	state.visible.x0 = open->visible.x0;
	state.visible.y0 = open->visible.y0;
	state.visible.x1 = open->visible.x1;
	state.visible.y1 = open->visible.y1;
	state.xscroll = open->xscroll;
	state.yscroll = open->yscroll;
	state.next = open->next;
	
	/* frameset windows shouldn't be shown */
	if ((g->bw->parent) && (g->bw->children))
		state.next = wimp_HIDDEN;

	/* handle 'auto' scroll bars' and non-fitting scrollbar removal */
	if ((g->bw->scrolling == SCROLLING_AUTO) || (g->bw->scrolling == SCROLLING_YES)) {
		/* windows lose scrollbars when containing a frameset */
		no_hscroll = (g->bw->children &&
				(g->bw->browser_window_type != BROWSER_WINDOW_NORMAL));
		no_vscroll = g->bw->children;
		
		/* hscroll */
		size = ro_get_hscroll_height(NULL);
		if (g->bw->border)
			size -= 2;
		fheight = height;
		if (state.flags & wimp_WINDOW_HSCROLL)
			fheight += size;
		if ((!no_hscroll) &&
				((fheight > size) ||
					(g->bw->browser_window_type == BROWSER_WINDOW_NORMAL)) &&
				((content && width < content->width * 2 * g->option.scale) ||
					(g->bw->scrolling == SCROLLING_YES))) {
			if (!(state.flags & wimp_WINDOW_HSCROLL)) {
				height -= size;
				state.visible.y0 += size;
				if (content) {
					g->reformat_pending = true;
					gui_reformat_pending = true;
				}
			}
			state.flags |= wimp_WINDOW_HSCROLL;
		} else {
			if (state.flags & wimp_WINDOW_HSCROLL) {
				height += size;
				state.visible.y0 -= size;
				if (content) {
					g->reformat_pending = true;
					gui_reformat_pending = true;
				}
			}
			state.flags &= ~wimp_WINDOW_HSCROLL;
		}
  
		/* vscroll */
		size = ro_get_vscroll_width(NULL);
		if (g->bw->border)
			size -= 2;
		fwidth = width;
		if (state.flags & wimp_WINDOW_VSCROLL)
			fwidth += size;
		if ((!no_vscroll) &&
				((fwidth > size) ||
					(g->bw->browser_window_type == BROWSER_WINDOW_NORMAL)) &&
				((content && height < content->height * 2 * g->option.scale) ||
					(g->bw->scrolling == SCROLLING_YES))) {
			if (!(state.flags & wimp_WINDOW_VSCROLL)) {
				width -= size;
				state.visible.x1 -= size;
				if (content) {
					g->reformat_pending = true;
					gui_reformat_pending = true;
				}
			}
			state.flags |= wimp_WINDOW_VSCROLL;
		} else {
			if (state.flags & wimp_WINDOW_VSCROLL) {
				width += size;
				state.visible.x1 += size;
				if (content) {
					g->reformat_pending = true;
					gui_reformat_pending = true;
				}
			}
			state.flags &= ~wimp_WINDOW_VSCROLL;
		}
	}

	/* change extent if necessary */
	if (g->old_width != width || g->old_height != height) {
		if (content) {
		  	if (g->old_width != width) {
				xosbyte1(osbyte_SCAN_KEYBOARD, 1 ^ 0x80, 0, &key_down);
				if (key_down)
					g->option.scale = (g->option.scale * width) / g->old_width;
			};
			g->reformat_pending = true;
			gui_reformat_pending = true;
		}

		g->old_width = width;
		g->old_height = height;
		
		if (content && height < content->height * 2 * g->option.scale)
			height = content->height * 2 * g->option.scale;
		if (content && width < content->width * 2 * g->option.scale)
			width = content->width * 2 * g->option.scale;
		os_box extent = { 0, -height, width, toolbar_height };
		error = xwimp_set_extent(g->window, &extent);
		if (error) {
			LOG(("xwimp_set_extent: 0x%x: %s",
					error->errnum, error->errmess));
			warn_user("WimpError", error->errmess);
			return;
		}

	}

	/* first resize stops any flickering by making the URL window on top */
	ro_gui_url_complete_resize(g, (wimp_open *)&state);

	error = xwimp_open_window_nested_with_flags(&state, parent, linkage);
	if (error) {
		LOG(("xwimp_open_window: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}

	if (g->toolbar) {
		ro_gui_theme_process_toolbar(g->toolbar, -1);
		/* second resize updates to the new URL bar width */
		ro_gui_url_complete_resize(g, open);
	}
}


/**
 * Animate the "throbbers" of all browser windows.
 */

void ro_gui_throb(void)
{
	os_t t;
	struct gui_window *g, *top_g;
	struct browser_window *top;
	char throb_buf[12];

	xos_read_monotonic_time(&t);

	for (g = window_list; g; g = g->next) {
		if (!g->bw->throbbing)
			continue;
		for (top = g->bw; top->parent; top = top->parent);
		top_g = top->window;
		if (!top_g->toolbar || !top_g->toolbar->display_throbber ||
				!top_g->toolbar->descriptor ||
				!top_g->toolbar->descriptor->theme ||
				(t < top_g->throbtime + 10))
			continue;
		top_g->throbtime = t;
		top_g->throbber++;
		if (top_g->toolbar->descriptor->theme->throbber_frames < top_g->throbber)
			top_g->throbber = 1;
		sprintf(throb_buf, "throbber%i", top_g->throbber);
		ro_gui_set_icon_string(top_g->toolbar->toolbar_handle,
				ICON_TOOLBAR_THROBBER, throb_buf);
		if (top_g->toolbar->descriptor->throbber_redraw)
			ro_gui_force_redraw_icon(top_g->toolbar->toolbar_handle,
					ICON_TOOLBAR_THROBBER);
	}
}


/**
 * Convert a RISC OS window handle to a gui_window.
 *
 * \param  w  RISC OS window handle
 * \return  pointer to a structure if found, 0 otherwise
 */

struct gui_window *ro_gui_window_lookup(wimp_w window)
{
	struct gui_window *g;
	for (g = window_list; g; g = g->next)
		if (g->window == window)
			return g;
	return 0;
}


/**
 * Convert a toolbar RISC OS window handle to a gui_window.
 *
 * \param  w  RISC OS window handle of a toolbar
 * \return  pointer to a structure if found, 0 otherwise
 */

struct gui_window *ro_gui_toolbar_lookup(wimp_w window)
{
	struct gui_window *g;
	for (g = window_list; g; g = g->next) {
		if ((g->toolbar) && ((g->toolbar->toolbar_handle == window) ||
				((g->toolbar->editor) &&
				(g->toolbar->editor->toolbar_handle == window))))
			return g;
	}
	return 0;
}


/**
 * Convert a status bar RISC OS window handle to a gui_window.
 *
 * \param  w  RISC OS window handle of a status bar
 * \return  pointer to a structure if found, 0 otherwise
 */

struct gui_window *ro_gui_status_lookup(wimp_w window)
{
	struct gui_window *g;
	for (g = window_list; g; g = g->next)
		if (g->toolbar && g->toolbar->status_handle == window)
			return g;
	return 0;
}


/**
 * Handle pointer movements in a browser window.
 *
 * \param  g	    browser window that the pointer is in
 * \param  pointer  new mouse position
 */

void ro_gui_window_mouse_at(struct gui_window *g, wimp_pointer *pointer)
{
	int x, y;
	wimp_window_state state;
	os_error *error;

	assert(g);

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
/*
 * the WIMP sometimes fails to realise the pointer has left a NetSurf window
 * so we get an error -- there is no gain from telling the user about this
 *
 *		warn_user("WimpError", error->errmess);
*/		return;
	}

	x = window_x_units(pointer->pos.x, &state) / 2 / g->option.scale;
	y = -window_y_units(pointer->pos.y, &state) / 2 / g->option.scale;

	browser_window_mouse_track(g->bw, ro_gui_mouse_drag_state(pointer->buttons), x, y);
}


/**
 * Process Mouse_Click events in a toolbar.
 */

bool ro_gui_toolbar_click(wimp_pointer *pointer)
{
	struct gui_window *g = ro_gui_toolbar_lookup(pointer->w);
	struct browser_window *new_bw;

	/* toolbars in the options window have no gui_window */
	if (!g)
		return true;

	/* try to close url-completion */
	ro_gui_url_complete_close(g, pointer->i);

	/*	Handle Menu clicks
	*/
	if (pointer->buttons == wimp_CLICK_MENU) {
		ro_gui_menu_create(browser_toolbar_menu, pointer->pos.x,
				pointer->pos.y, g->window);
		return true;
	}

	/*	Handle toolbar edits
	*/
	if ((g->toolbar->editor) && (pointer->i < ICON_TOOLBAR_URL)) {
		ro_gui_theme_toolbar_editor_click(g->toolbar, pointer);
		return true;
	}

	/*	Handle the buttons appropriately
	*/
	switch (pointer->i) {
		case ICON_TOOLBAR_BACK:
			if (pointer->buttons == wimp_CLICK_ADJUST) {
				new_bw = browser_window_create(NULL,
						g->bw, NULL, false);
				ro_gui_menu_handle_action(new_bw->window->window,
						BROWSER_NAVIGATE_BACK, true);
			} else {
				ro_gui_menu_handle_action(g->window,
						BROWSER_NAVIGATE_BACK, true);
			}
			break;

		case ICON_TOOLBAR_FORWARD:
			if (pointer->buttons == wimp_CLICK_ADJUST) {
				new_bw = browser_window_create(NULL,
						g->bw, NULL, false);
				ro_gui_menu_handle_action(new_bw->window->window,
						BROWSER_NAVIGATE_FORWARD, true);
			} else {
				ro_gui_menu_handle_action(g->window,
						BROWSER_NAVIGATE_FORWARD, true);
			}
			break;

		case ICON_TOOLBAR_STOP:
			ro_gui_menu_handle_action(g->window,
					BROWSER_NAVIGATE_STOP, true);
			break;

		case ICON_TOOLBAR_RELOAD:
			if (pointer->buttons == wimp_CLICK_SELECT)
				ro_gui_menu_handle_action(g->window,
						BROWSER_NAVIGATE_RELOAD, true);
			else if (pointer->buttons == wimp_CLICK_ADJUST)
				ro_gui_menu_handle_action(g->window,
						BROWSER_NAVIGATE_RELOAD_ALL, true);
			break;

		case ICON_TOOLBAR_HISTORY:
			if (pointer->buttons == wimp_CLICK_SELECT)
				ro_gui_menu_handle_action(g->window,
						HISTORY_SHOW_LOCAL, true);
			else
				ro_gui_menu_handle_action(g->window,
						HISTORY_SHOW_GLOBAL, true);
			break;
		case ICON_TOOLBAR_HOME:
			ro_gui_menu_handle_action(g->window,
					BROWSER_NAVIGATE_HOME, true);
			break;
#ifdef WITH_SEARCH
		case ICON_TOOLBAR_SEARCH:
			ro_gui_menu_handle_action(g->window,
					BROWSER_FIND_TEXT, true);
			break;
#endif
		case ICON_TOOLBAR_SCALE:
			ro_gui_menu_handle_action(g->window,
					BROWSER_SCALE_VIEW, true);
			break;

		case ICON_TOOLBAR_BOOKMARK:
			if (pointer->buttons == wimp_CLICK_ADJUST)
				ro_gui_menu_handle_action(g->window,
						HOTLIST_ADD_URL, true);
			else
				ro_gui_menu_handle_action(g->window,
						HOTLIST_SHOW, true);
			break;

		case ICON_TOOLBAR_SAVE:
			if (pointer->buttons == wimp_CLICK_ADJUST)
				ro_gui_menu_handle_action(g->window,
						BROWSER_SAVE_COMPLETE, true);
			else
				ro_gui_menu_handle_action(g->window,
						BROWSER_SAVE, true);
			break;
		case ICON_TOOLBAR_PRINT:
			ro_gui_menu_handle_action(g->window,
					BROWSER_PRINT, true);
			break;
		case ICON_TOOLBAR_UP:
			if (pointer->buttons == wimp_CLICK_ADJUST) {
				if (g->bw && g->bw->current_content) {
					new_bw = browser_window_create(NULL,
							g->bw, NULL, false);
					/* do it without loading the content into the new window */
					ro_gui_window_navigate_up(new_bw->window,
							g->bw->current_content->url);
				}
			} else {
				ro_gui_menu_handle_action(g->window,
						BROWSER_NAVIGATE_UP, true);
			}
			break;
		case ICON_TOOLBAR_URL:
			if (pointer->buttons & (wimp_DRAG_SELECT | wimp_DRAG_ADJUST)) {
				if (g->bw->current_content) {
					gui_save_type save_type;

					if (ro_gui_shift_pressed())
						save_type = GUI_SAVE_LINK_URL;
					else
						save_type = GUI_SAVE_LINK_TEXT;

					gui_drag_save_object(save_type, g->bw->current_content, g);
				}
			}
			else
				ro_gui_url_complete_start(g);
			break;
		case ICON_TOOLBAR_SUGGEST:
			ro_gui_popup_menu(url_suggest_menu,
					g->toolbar->toolbar_handle,
					ICON_TOOLBAR_SUGGEST);
			break;
	}
	return true;
}


/**
 * Handle Mouse_Click events in the status bar.
 *
 * \param  g	    browser window that owns the status bar
 * \param  pointer  details of mouse click
 */

bool ro_gui_status_click(wimp_pointer *pointer)
{
	struct gui_window *g = ro_gui_status_lookup(pointer->w);
	wimp_drag drag;
	os_error *error;

	assert(g);

	switch (pointer->i) {
		case ICON_STATUS_RESIZE:
			gui_current_drag_type = GUI_DRAG_STATUS_RESIZE;
			drag.w = pointer->w;
			drag.type = wimp_DRAG_SYSTEM_SIZE;
			drag.initial.x0 = pointer->pos.x;
			drag.initial.x1 = pointer->pos.x;
			drag.initial.y0 = pointer->pos.y;
			drag.initial.y1 = pointer->pos.y;
			error = xwimp_drag_box(&drag);
			if (error) {
				LOG(("xwimp_drag_box: 0x%x: %s",
						error->errnum, error->errmess));
				warn_user("WimpError", error->errmess);
			}
			break;
	}
	return true;
}


/**
 * Handle Mouse_Click events in a browser window.
 *
 * \param  pointer  details of mouse click
 * \return true if click handled, false otherwise
 */

bool ro_gui_window_click(wimp_pointer *pointer)
{
	struct gui_window *g;
	wimp_window_state state;
	os_error *error;
	int x, y;

	g = ro_gui_window_lookup(pointer->w);
	if (!g)
		return false;

	/* try to close url-completion */
	ro_gui_url_complete_close(g, pointer->i);

	state.w = pointer->w;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s", error->errnum,
							 error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}

	x = window_x_units(pointer->pos.x, &state) / 2 / g->option.scale;
	y = -window_y_units(pointer->pos.y, &state) / 2 / g->option.scale;

	/* set input focus */
	if (pointer->buttons == wimp_CLICK_SELECT ||
			pointer->buttons == wimp_CLICK_ADJUST) {
		error = xwimp_set_caret_position(state.w, -1,
				-100, -100, 32, -1);
		if (error) {
			LOG(("xwimp_set_caret_position: 0x%x: %s",
					error->errnum, error->errmess));
			warn_user("WimpError", error->errmess);
			return false;
		}
	}

	if (pointer->buttons == wimp_CLICK_MENU)
		ro_gui_menu_create(browser_menu, pointer->pos.x,
				pointer->pos.y, pointer->w);
	else
		browser_window_mouse_click(g->bw,
				ro_gui_mouse_click_state(pointer->buttons), x, y);

	return true;
}


/**
 * Update the interface to reflect start of page loading.
 *
 * \param  g  window with start of load
 */

void gui_window_start_throbber(struct gui_window *g)
{
	ro_gui_menu_objects_moved();
	ro_gui_prepare_navigate(g);
	xos_read_monotonic_time(&g->throbtime);
	g->throbber = 0;
}



/**
 * Update the interface to reflect page loading stopped.
 *
 * \param  g  window with start of load
 */

void gui_window_stop_throbber(struct gui_window *g)
{
	char throb_buf[12];
	ro_gui_prepare_navigate(g);
	g->throbber = 0;
	if (g->toolbar) {
		strcpy(throb_buf, "throbber0");
		ro_gui_set_icon_string(g->toolbar->toolbar_handle,
				ICON_TOOLBAR_THROBBER, throb_buf);
		if ((g->toolbar->descriptor) && (g->toolbar->descriptor->throbber_redraw))
			ro_gui_force_redraw_icon(g->toolbar->toolbar_handle,
					ICON_TOOLBAR_THROBBER);
	}
}


/**
 * Place the caret in a browser window.
 *
 * \param  g	   window with caret
 * \param  x	   coordinates of caret
 * \param  y	   coordinates of caret
 * \param  height  height of caret
 */

void gui_window_place_caret(struct gui_window *g, int x, int y, int height)
{
	os_error *error;

	error = xwimp_set_caret_position(g->window, -1,
			x * 2 * g->option.scale,
			-(y + height) * 2 * g->option.scale,
			height * 2 * g->option.scale, -1);
	if (error) {
		LOG(("xwimp_set_caret_position: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
	}
}


/**
 * Remove the caret, if present.
 *
 * \param  g	   window with caret
 */

void gui_window_remove_caret(struct gui_window *g)
{
	wimp_caret caret;
	os_error *error;

	error = xwimp_get_caret_position(&caret);
	if (error) {
		LOG(("xwimp_get_caret_position: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}

	if (caret.w != g->window)
		/* we don't have the caret: do nothing */
		return;

	/* hide caret, but keep input focus */
	error = xwimp_set_caret_position(g->window, -1,
			-100, -100, 32, -1);
	if (error) {
		LOG(("xwimp_set_caret_position: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}
}


/**
 * Process Key_Pressed events in a browser window.
 */

bool ro_gui_window_keypress(wimp_key *key)
{
	struct gui_window *g;
	bool toolbar;
	struct content *content;
	wimp_window_state state;
	int y;
	char *toolbar_url;
	os_error *error;
	wimp_pointer pointer;
	float old_scale;
	wchar_t c = (wchar_t)key->c;

	/* Find gui window */
	if ((g = ro_gui_window_lookup(key->w)) != NULL) {
		toolbar = false;
	} else if ((g = ro_gui_toolbar_lookup(key->w)) != NULL) {
		toolbar = true;
	} else {
		/* nothing to do with us */
		return false;
	}

	content = g->bw->current_content;

	error = xwimp_get_pointer_info(&pointer);
	if (error) {
		LOG(("xwimp_get_pointer_info: 0x%x: %s\n",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}

	/* First send the key to the browser window, eg. form fields. */
	if (!toolbar) {
		if ((unsigned)c < 0x20 || (0x7f <= c && c <= 0x9f) ||
				(c & IS_WIMP_KEY)) {
		/* Munge control keys into unused control chars */
		/* We can't map onto 1->26 (reserved for ctrl+<qwerty>
		   That leaves 27->31 and 128->159 */
			switch (c & ~IS_WIMP_KEY) {
			case wimp_KEY_TAB: c = 9; break;
			case wimp_KEY_SHIFT | wimp_KEY_TAB: c = 11; break;

			/* cursor movement keys */
			case wimp_KEY_HOME:
			case wimp_KEY_CONTROL | wimp_KEY_LEFT:
				c = KEY_LINE_START;
				break;
			case wimp_KEY_END:
				if (os_version >= RISCOS5)
					c = KEY_LINE_END;
				else
					c = KEY_DELETE_RIGHT;
				break;
			case wimp_KEY_CONTROL | wimp_KEY_RIGHT: c = KEY_LINE_END;   break;
			case wimp_KEY_CONTROL | wimp_KEY_UP:	c = KEY_TEXT_START; break;
			case wimp_KEY_CONTROL | wimp_KEY_DOWN:  c = KEY_TEXT_END;   break;
			case wimp_KEY_SHIFT | wimp_KEY_LEFT:	c = KEY_WORD_LEFT ; break;
			case wimp_KEY_SHIFT | wimp_KEY_RIGHT:	c = KEY_WORD_RIGHT; break;
			case wimp_KEY_SHIFT | wimp_KEY_UP:	c = KEY_PAGE_UP;    break;
			case wimp_KEY_SHIFT | wimp_KEY_DOWN:	c = KEY_PAGE_DOWN;  break;
			case wimp_KEY_LEFT:  c = KEY_LEFT; break;
			case wimp_KEY_RIGHT: c = KEY_RIGHT; break;
			case wimp_KEY_UP:    c = KEY_UP; break;
			case wimp_KEY_DOWN:  c = KEY_DOWN; break;

			/* editing */
			case wimp_KEY_CONTROL | wimp_KEY_END:
				c = KEY_DELETE_LINE_END;
				break;
			case wimp_KEY_DELETE:
				if (ro_gui_ctrl_pressed())
					c = KEY_DELETE_LINE_START;
				else if (os_version < RISCOS5)
					c = KEY_DELETE_LEFT;
				break;

			default:
				break;
			}
		}

		if (!(c & IS_WIMP_KEY)) {
			if (browser_window_key_press(g->bw, c))
				return true;
		}

		/* Reset c to incoming character / key code
		 * as we may have corrupted it above */
		c = (wchar_t)key->c;
	}

	switch (c) {
		case IS_WIMP_KEY + wimp_KEY_F1:	/* Help. */
			return ro_gui_menu_handle_action(g->window,
					HELP_OPEN_CONTENTS, false);

		case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_F1:
			return ro_gui_menu_handle_action(g->window,
					BROWSER_PAGE_INFO, false);

		case IS_WIMP_KEY + wimp_KEY_F2:
			if (!g->toolbar)
				return false;
			ro_gui_url_complete_close(NULL, 0);
			ro_gui_set_icon_string(g->toolbar->toolbar_handle,
					ICON_TOOLBAR_URL, "www.");
			xwimp_set_caret_position(g->toolbar->toolbar_handle,
					ICON_TOOLBAR_URL, 0, 0, -1, 4);
			ro_gui_url_complete_start(g);
			ro_gui_url_complete_keypress(g, wimp_KEY_DOWN);
			return true;

		case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_F2:
			/* Close window. */
			ro_gui_url_complete_close(NULL, 0);
			browser_window_destroy(g->bw);
			return true;

		case 19:		/* Ctrl + S */
		case IS_WIMP_KEY + wimp_KEY_F3:
			return ro_gui_menu_handle_action(g->window,
					BROWSER_SAVE, false);

		case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_F3:
			return ro_gui_menu_handle_action(g->window,
					BROWSER_EXPORT_TEXT, false);

		case IS_WIMP_KEY + wimp_KEY_SHIFT + wimp_KEY_F3:
			return ro_gui_menu_handle_action(g->window,
					BROWSER_SAVE_COMPLETE, false);

		case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_SHIFT + wimp_KEY_F3:
			return ro_gui_menu_handle_action(g->window,
					BROWSER_EXPORT_DRAW, false);

#ifdef WITH_SEARCH
		case 6:			/* Ctrl + F */
		case IS_WIMP_KEY + wimp_KEY_F4:	/* Search */
			return ro_gui_menu_handle_action(g->window,
					BROWSER_FIND_TEXT, false);
#endif

		case IS_WIMP_KEY + wimp_KEY_F5:	/* Reload */
			return ro_gui_menu_handle_action(g->window,
					BROWSER_NAVIGATE_RELOAD, false);

		case 18:		/* Ctrl+R (Full reload) */
		case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_F5:	/* Full reload */
			return ro_gui_menu_handle_action(g->window,
					BROWSER_NAVIGATE_RELOAD_ALL, false);

		case IS_WIMP_KEY + wimp_KEY_F6:	/* Hotlist */
			return ro_gui_menu_handle_action(g->window,
					HOTLIST_SHOW, false);

		case IS_WIMP_KEY + wimp_KEY_F7:	/* Show local history */
			return ro_gui_menu_handle_action(g->window,
					HISTORY_SHOW_LOCAL, false);

		case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_F7:
			/* Show global history */
			return ro_gui_menu_handle_action(g->window,
					HISTORY_SHOW_GLOBAL, false);

		case IS_WIMP_KEY + wimp_KEY_F8:	/* View source */
			ro_gui_view_source(content);
			return true;

		case IS_WIMP_KEY + wimp_KEY_F9:
			/* Dump content for debugging. */
			switch (content->type) {
				case CONTENT_HTML:
					box_dump(content->data.html.layout, 0);
					break;
				case CONTENT_CSS:
					css_dump_stylesheet(content->data.css.css);
					break;
				default:
					break;
			}
			return true;

		case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_F9:
			urldb_dump();
			return true;

		case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_SHIFT + wimp_KEY_F9:
			talloc_report_full(0, stderr);
			return true;

		case IS_WIMP_KEY + wimp_KEY_F11:	/* Zoom */
			return ro_gui_menu_handle_action(g->window,
					BROWSER_SCALE_VIEW, false);

		case IS_WIMP_KEY + wimp_KEY_SHIFT + wimp_KEY_F11:
			/* Toggle display of box outlines. */
			html_redraw_debug = !html_redraw_debug;
			gui_window_redraw_window(g);
			return true;

		case wimp_KEY_RETURN:
			if (!toolbar)
				break;
			toolbar_url = ro_gui_get_icon_string(g->toolbar->toolbar_handle,
					ICON_TOOLBAR_URL);
			ro_gui_window_launch_url(g, toolbar_url);
			return true;

		case wimp_KEY_ESCAPE:
			if (ro_gui_url_complete_close(NULL, 0)) {
				ro_gui_url_complete_start(g);
				return true;
			}
			return ro_gui_menu_handle_action(g->window,
					BROWSER_NAVIGATE_STOP, false);

		case  8:	/* CTRL+H / Backspace */
			if (!toolbar) {
				if (!ro_gui_ctrl_pressed()) {
					/* Backspace */
					if (ro_gui_shift_pressed()) {
						return ro_gui_menu_handle_action(
							g->window,
							BROWSER_NAVIGATE_FORWARD,
							false);
					}
					else {
						return ro_gui_menu_handle_action(
							g->window,
							BROWSER_NAVIGATE_BACK,
							false);
					}
				}
			} else {
				return ro_gui_url_complete_keypress(g, c);
			}
			break;

		case 14:	/* CTRL+N */
			return ro_gui_menu_handle_action(g->window,
					BROWSER_NEW_WINDOW, false);

		case 17:       /* CTRL+Q (Zoom out) */
		case 23:       /* CTRL+W (Zoom in) */
			if (!content)
				break;
			old_scale = g->option.scale;
			if (ro_gui_shift_pressed() && c == 17)
				g->option.scale = ((int) (10 * g->option.scale -
						1)) / 10.0;
			else if (ro_gui_shift_pressed() && c == 23)
				g->option.scale = ((int) (10 * g->option.scale +
						1)) / 10.0;
			else if (c == 17) {
				for (int i = SCALE_SNAP_TO_SIZE - 1; i >= 0; i--)
					if (scale_snap_to[i] < old_scale) {
						g->option.scale = scale_snap_to[i];
						break;
					}
			} else {
				for (unsigned int i = 0; i < SCALE_SNAP_TO_SIZE; i++)
					if (scale_snap_to[i] > old_scale) {
						g->option.scale = scale_snap_to[i];
						break;
					}
			}
			if (g->option.scale < scale_snap_to[0])
				g->option.scale = scale_snap_to[0];
			if (g->option.scale > scale_snap_to[SCALE_SNAP_TO_SIZE - 1])
				g->option.scale =
						scale_snap_to[SCALE_SNAP_TO_SIZE - 1];
			if (old_scale != g->option.scale) {
				g->reformat_pending = true;
				if ((content) && (content->type != CONTENT_HTML))
					browser_window_update(g->bw, false);
				gui_reformat_pending = true;
			}
			return true;

#ifdef WITH_PRINT
		case IS_WIMP_KEY + wimp_KEY_PRINT:
			return ro_gui_menu_handle_action(g->window,
					BROWSER_PRINT, false);
#endif

		case IS_WIMP_KEY + wimp_KEY_UP:
		case IS_WIMP_KEY + wimp_KEY_DOWN:
		case IS_WIMP_KEY + wimp_KEY_PAGE_UP:
		case IS_WIMP_KEY + wimp_KEY_PAGE_DOWN:
		case wimp_KEY_HOME:
		case IS_WIMP_KEY | wimp_KEY_CONTROL | wimp_KEY_UP:
		case IS_WIMP_KEY + wimp_KEY_END:
		case IS_WIMP_KEY | wimp_KEY_CONTROL | wimp_KEY_DOWN:
			if (toolbar)
				return ro_gui_url_complete_keypress(g, c);
			break;
		default:
			if (toolbar)
				return ro_gui_url_complete_keypress(g, c);
			return false;
	}

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		return true;
	}

	y = state.visible.y1 - state.visible.y0 - 32;
	if (g->toolbar)
		y -= ro_gui_theme_toolbar_full_height(g->toolbar);

	switch (c) {
		case IS_WIMP_KEY | wimp_KEY_UP:
			state.yscroll += 32;
			break;
		case IS_WIMP_KEY | wimp_KEY_DOWN:
			state.yscroll -= 32;
			break;
		case IS_WIMP_KEY | wimp_KEY_PAGE_UP:
			state.yscroll += y;
			break;
		case IS_WIMP_KEY | wimp_KEY_PAGE_DOWN:
			state.yscroll -= y;
			break;
		case wimp_KEY_HOME:
		case IS_WIMP_KEY | wimp_KEY_CONTROL | wimp_KEY_UP:
			state.yscroll = 1000;
			break;
		case IS_WIMP_KEY | wimp_KEY_END:
		case IS_WIMP_KEY | wimp_KEY_CONTROL | wimp_KEY_DOWN:
			state.yscroll = -0x10000000;
			break;
	}

	error = xwimp_open_window((wimp_open *) &state);
	if (error) {
		LOG(("xwimp_open_window: 0x%x: %s",
				error->errnum, error->errmess));
	}

	return true;
}


/**
 * Process Scroll_Request events.
 */
void ro_gui_scroll_request(wimp_scroll *scroll)
{
	int x, y;
	struct gui_window *g = ro_gui_window_lookup(scroll->w);

	if (!g)
		return;

	x = scroll->visible.x1 - scroll->visible.x0 - 32;
	y = scroll->visible.y1 - scroll->visible.y0 - 32;
	if (g->toolbar)
		y -= ro_gui_theme_toolbar_full_height(g->toolbar);

	switch (scroll->xmin) {
		case wimp_SCROLL_PAGE_LEFT:
			scroll->xscroll -= x;
			break;
		case wimp_SCROLL_COLUMN_LEFT:
			scroll->xscroll -= 32;
			break;
		case wimp_SCROLL_COLUMN_RIGHT:
			scroll->xscroll += 32;
			break;
		case wimp_SCROLL_PAGE_RIGHT:
			scroll->xscroll += x;
			break;
		default:
			break;
	}

	switch (scroll->ymin) {
		case wimp_SCROLL_PAGE_UP:
			scroll->yscroll += y;
			break;
		case wimp_SCROLL_LINE_UP:
			scroll->yscroll += 32;
			break;
		case wimp_SCROLL_LINE_DOWN:
			scroll->yscroll -= 32;
			break;
		case wimp_SCROLL_PAGE_DOWN:
			scroll->yscroll -= y;
			break;
		default:
			break;
	}

	wimp_open_window((wimp_open *) scroll);
}


/**
 * Convert x from screen to window coordinates.
 *
 * \param  x	  x coordinate / os units
 * \param  state  window state
 * \return  x coordinate in window / os units
 */
//#define window_x_units(x, state) (x - (state->visible.x0 - state->xscroll))
int window_x_units(int x, wimp_window_state *state) {
	return x - (state->visible.x0 - state->xscroll);
}


/**
 * Convert y from screen to window coordinates.
 *
 * \param  y	  y coordinate / os units
 * \param  state  window state
 * \return  y coordinate in window / os units
 */
//#define window_y_units(y, state) (y - (state->visible.y1 - state->yscroll))
int window_y_units(int y, wimp_window_state *state) {
	return y - (state->visible.y1 - state->yscroll);
}


/**
 * Convert x,y window co-ordinates into screen co-ordinates.
 *
 * \param  g	gui window
 * \param  x	x ordinate
 * \param  y	y ordinate
 * \param  pos  receives position in screen co-ordinatates
 * \return true iff conversion successful
 */

bool window_screen_pos(struct gui_window *g, int x, int y, os_coord *pos)
{
	wimp_window_state state;
	os_error *error;

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x:%s",
			error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}
	pos->x = state.visible.x0 + ((x * 2 * g->option.scale)  - state.xscroll);
	pos->y = state.visible.y1 + ((-y * 2 * g->option.scale) - state.yscroll);
	return true;
}


/**
 * Handle Message_DataLoad (file dragged in) for a window.
 *
 * \param  g	    window
 * \param  message  Message_DataLoad block
 * \return  true if the load was processed
 *
 * If the file was dragged into a form file input, it is used as the value.
 */

bool ro_gui_window_dataload(struct gui_window *g, wimp_message *message)
{
	int box_x = 0, box_y = 0;
	int x, y;
	struct box *box;
	struct box *file_box = 0;
	struct box *text_box = 0;
	struct browser_window *bw = g->bw;
	struct content *content;
	wimp_window_state state;
	os_error *error;

	/* HTML content only. */
	if (!bw->current_content || bw->current_content->type != CONTENT_HTML)
		return false;

	/* Ignore directories etc. */
	if (0x1000 <= message->data.data_xfer.file_type)
		return false;

	/* Search for a file input or text area at the drop point. */
	state.w = message->data.data_xfer.w;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s\n",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}

	x = window_x_units(message->data.data_xfer.pos.x, &state) / 2 /
			g->option.scale;
	y = -window_y_units(message->data.data_xfer.pos.y, &state) / 2 /
			g->option.scale;

	content = bw->current_content;
	box = content->data.html.layout;
	while ((box = box_at_point(box, x, y, &box_x, &box_y, &content))) {
		if (box->style &&
				box->style->visibility == CSS_VISIBILITY_HIDDEN)
			continue;

		if (box->gadget) {
			switch (box->gadget->type) {
				case GADGET_FILE:
					file_box = box;
				break;

				case GADGET_TEXTBOX:
				case GADGET_TEXTAREA:
				case GADGET_PASSWORD:
					text_box = box;
					break;

				default:	/* appease compiler */
					break;
			}
		}
	}

	if (!file_box && !text_box)
		return false;

	if (file_box) {
		utf8_convert_ret ret;
		char *utf8_fn;

		ret = utf8_from_local_encoding(
				message->data.data_xfer.file_name, 0,
				&utf8_fn);
		if (ret != UTF8_CONVERT_OK) {
			/* A bad encoding should never happen */
			assert(ret != UTF8_CONVERT_BADENC);
			LOG(("utf8_from_local_encoding failed"));
			/* Load was for us - just no memory */
			return true;
		}

		/* Found: update form input. */
		free(file_box->gadget->value);
		file_box->gadget->value = utf8_fn;

		/* Redraw box. */
		box_coords(file_box, &x, &y);
		gui_window_redraw(bw->window, x, y,
				x + file_box->width,
				y + file_box->height);
	} else {

		const char *filename = message->data.data_xfer.file_name;

		browser_window_mouse_click(g->bw, BROWSER_MOUSE_CLICK_1, x, y);

		if (!ro_gui_window_import_text(g, filename, false))
			return true;  /* it was for us, it just didn't work! */
	}

	/* send DataLoadAck */
	message->action = message_DATA_LOAD_ACK;
	message->your_ref = message->my_ref;
	error = xwimp_send_message(wimp_USER_MESSAGE, message, message->sender);
	if (error) {
		LOG(("xwimp_send_message: 0x%x: %s\n",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
	}

	return true;
}


/**
 * Handle Message_DataLoad (file dragged in) for a toolbar
 *
 * \param  g	    window
 * \param  message  Message_DataLoad block
 * \return true if the load was processed
 */

bool ro_gui_toolbar_dataload(struct gui_window *g, wimp_message *message)
{
	if (message->data.data_xfer.file_type == osfile_TYPE_TEXT &&
		ro_gui_window_import_text(g, message->data.data_xfer.file_name, true)) {

		os_error *error;

		/* send DataLoadAck */
		message->action = message_DATA_LOAD_ACK;
		message->your_ref = message->my_ref;
		error = xwimp_send_message(wimp_USER_MESSAGE, message, message->sender);
		if (error) {
			LOG(("xwimp_send_message: 0x%x: %s\n",
					error->errnum, error->errmess));
			warn_user("WimpError", error->errmess);
		}
		return true;
	}
	return false;
}


/**
 * Process pending reformats
 */

void ro_gui_window_process_reformats(void)
{
	struct gui_window *g;

	gui_reformat_pending = false;
	for (g = window_list; g; g = g->next) {
		if (!g->reformat_pending)
			continue;
		g->reformat_pending = false;
		content_reformat(g->bw->current_content,
				g->old_width / 2 / g->option.scale,
				gui_window_get_height(g));
	}
}


/**
 * Clones a browser window's options.
 *
 * \param  new_bw  the new browser window
 * \param  old_bw  the browser window to clone from, or NULL for default
 */

void ro_gui_window_clone_options(struct browser_window *new_bw,
		struct browser_window *old_bw) {
	struct gui_window *old_gui = NULL;
	struct gui_window *new_gui;

	assert(new_bw);

	/*	Get our GUIs
	*/
	new_gui = new_bw->window;

	if (old_bw)
		old_gui = old_bw->window;

	/*	Clone the basic options
	*/
	if (!old_gui) {
		new_gui->option.scale = ((float)option_scale) / 100;
		new_gui->option.background_images = option_background_images;
		new_gui->option.buffer_animations = option_buffer_animations;
		new_gui->option.buffer_everything = option_buffer_everything;
	} else {
		new_gui->option = old_gui->option;
	}

	/*	Set up the toolbar
	*/
	if (new_gui->toolbar) {
		if ((old_gui) && (old_gui->toolbar)) {
			new_gui->toolbar->status_width = old_gui->toolbar->status_width;
			new_gui->toolbar->display_status = old_gui->toolbar->display_status;
			new_gui->toolbar->display_buttons = old_gui->toolbar->display_buttons;
			new_gui->toolbar->display_url = old_gui->toolbar->display_url;
			new_gui->toolbar->display_throbber = old_gui->toolbar->display_throbber;
		} else {
			new_gui->toolbar->status_width = option_toolbar_status_width;
			new_gui->toolbar->display_status = option_toolbar_show_status;
			new_gui->toolbar->display_buttons = option_toolbar_show_buttons;
			new_gui->toolbar->display_url = option_toolbar_show_address;
			new_gui->toolbar->display_throbber = option_toolbar_show_throbber;
		}
		new_gui->toolbar->reformat_buttons = true;
		ro_gui_theme_process_toolbar(new_gui->toolbar, -1);
	}
}


/**
 * Makes a browser window's options the default.
 *
 * \param  bw  the browser window to read options from
 */

void ro_gui_window_default_options(struct browser_window *bw) {
	struct gui_window *gui;

	assert(bw);

	/*	Get our GUI
	*/
	gui = bw->window;
	if (!gui) return;

	/*	Save the basic options
	*/
	option_scale = gui->option.scale * 100;
	option_buffer_animations = gui->option.buffer_animations;
	option_buffer_everything = gui->option.buffer_everything;

	/*	Set up the toolbar
	*/
	if (gui->toolbar) {
		option_toolbar_status_width = gui->toolbar->status_width;
		option_toolbar_show_status = gui->toolbar->display_status;
		option_toolbar_show_buttons = gui->toolbar->display_buttons;
		option_toolbar_show_address = gui->toolbar->display_url;
		option_toolbar_show_throbber = gui->toolbar->display_throbber;
	}
}


/** An entry in ro_gui_pointer_table. */
struct ro_gui_pointer_entry {
	bool wimp_area;  /** The pointer is in the Wimp's sprite area. */
	char sprite_name[12];
	int xactive;
	int yactive;
};

/** Map from gui_pointer_shape to pointer sprite data. Must be ordered as
 * enum gui_pointer_shape. */
struct ro_gui_pointer_entry ro_gui_pointer_table[] = {
	{ true, "ptr_default", 0, 0 },
	{ false, "ptr_point", 6, 0 },
	{ false, "ptr_caret", 4, 9 },
	{ false, "ptr_menu", 6, 4 },
	{ false, "ptr_ud", 6, 7 },
	{ false, "ptr_ud", 6, 7 },
	{ false, "ptr_lr", 7, 6 },
	{ false, "ptr_lr", 7, 6 },
	{ false, "ptr_ld", 7, 7 },
	{ false, "ptr_ld", 7, 7 },
	{ false, "ptr_rd", 7, 7 },
	{ false, "ptr_rd", 6, 7 },
	{ false, "ptr_cross", 7, 7 },
	{ false, "ptr_move", 8, 0 },
	{ false, "ptr_wait", 7, 10 },
	{ false, "ptr_help", 0, 0 },
	{ false, "ptr_nodrop", 0, 0 },
	{ false, "ptr_nt_allwd", 10, 10 },
	{ false, "ptr_progress", 0, 0 },
};

/**
 * Change mouse pointer shape
 */

void gui_window_set_pointer(struct gui_window *g, gui_pointer_shape shape)
{
	static gui_pointer_shape curr_pointer = GUI_POINTER_DEFAULT;
	struct ro_gui_pointer_entry *entry;
	os_error *error;

	if (shape == curr_pointer)
		return;

	assert(shape < sizeof ro_gui_pointer_table /
			sizeof ro_gui_pointer_table[0]);

	entry = &ro_gui_pointer_table[shape];

	if (entry->wimp_area) {
		/* pointer in the Wimp's sprite area */
		error = xwimpspriteop_set_pointer_shape(entry->sprite_name,
				1, entry->xactive, entry->yactive, 0, 0);
		if (error) {
			LOG(("xwimpspriteop_set_pointer_shape: 0x%x: %s",
					error->errnum, error->errmess));
			warn_user("WimpError", error->errmess);
		}
	} else {
		/* pointer in our own sprite area */
		error = xosspriteop_set_pointer_shape(osspriteop_USER_AREA,
				gui_sprites,
				(osspriteop_id) entry->sprite_name,
				1, entry->xactive, entry->yactive, 0, 0);
		if (error) {
			LOG(("xosspriteop_set_pointer_shape: 0x%x: %s",
					error->errnum, error->errmess));
			warn_user("WimpError", error->errmess);
		}
	}

	curr_pointer = shape;
}


/**
 * Remove the mouse pointer from the screen
 */

void gui_window_hide_pointer(struct gui_window *g)
{
	os_error *error;

	error = xwimpspriteop_set_pointer_shape(NULL, 0x30, 0, 0, 0, 0);
	if (error) {
		LOG(("xwimpspriteop_set_pointer_shape: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
	}
}


/**
 * Called when the gui_window has new content.
 *
 * \param  g  the gui_window that has new content
 */

void gui_window_new_content(struct gui_window *g)
{
	ro_gui_menu_objects_moved();
	ro_gui_prepare_navigate(g);
	ro_gui_dialog_close_persistent(g->window);
}


/**
 * Updates the navigation controls for all toolbars;
 *
 * \param  g	the gui_window to launch the URL into
 * \param  url  the URL to launch, or NULL to simply update the suggestion icon
 */
void ro_gui_window_prepare_navigate_all(void) {
	struct gui_window *g;

	for (g = window_list; g; g = g->next)
		ro_gui_prepare_navigate(g);
}


/**
 * Returns the state of the mouse buttons and modifiers keys for a
 * click/release action, suitable for passing to the OS-independent
 * browser window code
 */

browser_mouse_state ro_gui_mouse_click_state(wimp_mouse_state buttons)
{
	browser_mouse_state state = 0;

	if (buttons & (wimp_CLICK_SELECT)) state |= BROWSER_MOUSE_CLICK_1;
	if (buttons & (wimp_CLICK_ADJUST)) state |= BROWSER_MOUSE_CLICK_2;

	if (buttons & (wimp_DRAG_SELECT)) state |= BROWSER_MOUSE_DRAG_1;
	if (buttons & (wimp_DRAG_ADJUST)) state |= BROWSER_MOUSE_DRAG_2;

	if (ro_gui_shift_pressed()) state |= BROWSER_MOUSE_MOD_1;
	if (ro_gui_ctrl_pressed())  state |= BROWSER_MOUSE_MOD_2;

	return state;
}


/**
 * Returns the state of the mouse buttons and modifiers keys whilst
 * dragging, for passing to the OS-independent browser window code
 */

browser_mouse_state ro_gui_mouse_drag_state(wimp_mouse_state buttons)
{
	browser_mouse_state state = 0;

	if (buttons & (wimp_CLICK_SELECT)) state |= BROWSER_MOUSE_HOLDING_1;
	if (buttons & (wimp_CLICK_ADJUST)) state |= BROWSER_MOUSE_HOLDING_2;

	if (ro_gui_shift_pressed()) state |= BROWSER_MOUSE_MOD_1;
	if (ro_gui_ctrl_pressed())  state |= BROWSER_MOUSE_MOD_2;

	return state;
}


/**
 * Returns true iff one or more Shift keys is held down
 */

bool ro_gui_shift_pressed(void)
{
	int shift = 0;
	xosbyte1(osbyte_SCAN_KEYBOARD, 0 ^ 0x80, 0, &shift);
	return (shift == 0xff);
}


/**
 * Returns true iff one or more Ctrl keys is held down
 */

bool ro_gui_ctrl_pressed(void)
{
	int ctrl = 0;
	xosbyte1(osbyte_SCAN_KEYBOARD, 1 ^ 0x80, 0, &ctrl);
	return (ctrl == 0xff);
}


/**
 * Platform-dependent part of starting a box scrolling operation,
 * for frames and textareas.
 *
 * \param  x0  minimum x ordinate of box relative to mouse pointer
 * \param  y0  minimum y ordinate
 * \param  x1  maximum x ordinate
 * \param  y1  maximum y ordinate
 * \return true iff succesful
 */

bool gui_window_box_scroll_start(struct gui_window *g, int x0, int y0, int x1, int y1)
{
	wimp_pointer pointer;
	os_error *error;
	wimp_drag drag;

	error = xwimp_get_pointer_info(&pointer);
	if (error) {
		LOG(("xwimp_get_pointer_info 0x%x : %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}

	drag.type = wimp_DRAG_USER_POINT;
	drag.bbox.x0 = pointer.pos.x + (int)(x0 * 2 * g->option.scale);
	drag.bbox.y0 = pointer.pos.y + (int)(y0 * 2 * g->option.scale);
	drag.bbox.x1 = pointer.pos.x + (int)(x1 * 2 * g->option.scale);
	drag.bbox.y1 = pointer.pos.y + (int)(y1 * 2 * g->option.scale);

	error = xwimp_drag_box(&drag);
	if (error) {
		LOG(("xwimp_drag_box: 0x%x : %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}

	gui_current_drag_type = GUI_DRAG_SCROLL;
	return true;
}


/**
 * Starts drag scrolling of a browser window
 *
 * \param gw  gui window
 */

bool gui_window_scroll_start(struct gui_window *g)
{
	wimp_window_info_base info;
	wimp_pointer pointer;
	os_error *error;
	wimp_drag drag;
	int height;
	int width;

	error = xwimp_get_pointer_info(&pointer);
	if (error) {
		LOG(("xwimp_get_pointer_info 0x%x : %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}

	info.w = g->window;
	error = xwimp_get_window_info_header_only((wimp_window_info*)&info);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x : %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}

	width  = info.extent.x1 - info.extent.x0;
	height = info.extent.y1 - info.extent.y0;

	drag.type = wimp_DRAG_USER_POINT;
	drag.bbox.x1 = pointer.pos.x + info.xscroll;
	drag.bbox.y0 = pointer.pos.y + info.yscroll;
	drag.bbox.x0 = drag.bbox.x1 - (width  - (info.visible.x1 - info.visible.x0));
	drag.bbox.y1 = drag.bbox.y0 + (height - (info.visible.y1 - info.visible.y0));

	if (g->toolbar) {
		int tbar_height = ro_gui_theme_toolbar_full_height(g->toolbar);
		drag.bbox.y0 -= tbar_height;
		drag.bbox.y1 -= tbar_height;
	}

	error = xwimp_drag_box(&drag);
	if (error) {
		LOG(("xwimp_drag_box: 0x%x : %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}

	gui_current_drag_type = GUI_DRAG_SCROLL;
	return true;
}


/**
 * Completes scrolling of a browser window
 *
 * \param g  gui window
 */

void ro_gui_window_scroll_end(struct gui_window *g, wimp_dragged *drag)
{
	wimp_window_state state;
	wimp_pointer pointer;
	os_error *error;
	int x, y;

	gui_current_drag_type = GUI_DRAG_NONE;
	if (!g)
		return;

	error = xwimp_drag_box((wimp_drag*)-1);
	if (error) {
		LOG(("xwimp_drag_box: 0x%x : %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
	}

	error = xwimp_get_pointer_info(&pointer);
	if (error) {
		LOG(("xwimp_get_pointer_info 0x%x : %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}

	error = xwimpspriteop_set_pointer_shape("ptr_default", 0x31, 0, 0, 0, 0);
	if (error) {
		LOG(("xwimpspriteop_set_pointer_shape: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
	}

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state 0x%x : %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return;
	}

	x = window_x_units(drag->final.x0, &state) / 2 / g->option.scale;
	y = -window_y_units(drag->final.y0, &state) / 2 / g->option.scale;

	browser_window_mouse_drag_end(g->bw,
		ro_gui_mouse_click_state(pointer.buttons), x, y);
}


/**
 * Starts drag resizing of a browser frame
 *
 * \param gw  gui window
 */

bool gui_window_frame_resize_start(struct gui_window *g)
{
	wimp_pointer pointer;
	os_error *error;
	wimp_drag drag;
	int x0, y0, x1, y1;
	int row = -1, col = -1, i;
	struct browser_window *top, *bw;
	wimp_window_state state;
                                     
	/* get the maximum drag box (collapse all surrounding frames */
	bw = g->bw;
	x0 = bw->x0;
	y0 = bw->y0;
	x1 = bw->x1;
	y1 = bw->y1;
	for (i = 0; i < (bw->parent->cols * bw->parent->rows); i++) {
		  if (&bw->parent->children[i] == bw) {
		  	col = i % bw->parent->cols;
		  	row = i / bw->parent->cols;
		  }
	}
	assert((row >= 0) && (col >= 0));
	
	if (g->bw->drag_resize_left)
		x0 = bw->parent->children[row * bw->parent->cols + (col - 1)].x0; 
	if (g->bw->drag_resize_right)
		x1 = bw->parent->children[row * bw->parent->cols + (col + 1)].x1;
	if (g->bw->drag_resize_up)
		y0 = bw->parent->children[(row - 1) * bw->parent->cols + col].y0;
	if (g->bw->drag_resize_down)
		y1 = bw->parent->children[(row + 1) * bw->parent->cols + col].y1;

	/* convert to screen co-ordinates */
	top = browser_window_owner(bw);
	state.w = top->window->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		LOG(("xwimp_get_window_state: 0x%x: %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}
	x0 = state.visible.x0 + x0 * 2;
	y0 = state.visible.y0 + y0 * 2;
	x1 = state.visible.x0 + x1 * 2 - 1;
	y1 = state.visible.y0 + y1 * 2 - 1;
	
	/* get the pointer position */
	error = xwimp_get_pointer_info(&pointer);
	if (error) {
		LOG(("xwimp_get_pointer_info 0x%x : %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}

	/* stop dragging in directions we can't extend */
	if (!(g->bw->drag_resize_left || g->bw->drag_resize_right)) {
	  	x0 = pointer.pos.x;
	  	x1 = pointer.pos.x;
	}
	if (!(g->bw->drag_resize_up || g->bw->drag_resize_down)) {
	  	y0 = pointer.pos.y;
	  	y1 = pointer.pos.y;
	}

	/* start the drag */
	drag.type = wimp_DRAG_USER_POINT;
	drag.bbox.x0 = x0;
	drag.bbox.y0 = y0;
	drag.bbox.x1 = x1;
	drag.bbox.y1 = y1;

	error = xwimp_drag_box(&drag);
	if (error) {
		LOG(("xwimp_drag_box: 0x%x : %s",
				error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		return false;
	}

	/* we may not be the window the pointer is currently over */
	gui_track_gui_window = bw->window;
	gui_current_drag_type = GUI_DRAG_FRAME;
	return true;
}


/**
 * Completes resizing of a browser frame
 *
 * \param g  gui window
 */

void ro_gui_window_frame_resize_end(struct gui_window *g, wimp_dragged *drag)
{
  	/* our clean-up is the same as for page scrolling */
	ro_gui_window_scroll_end(g, drag);
}


/**
 * Alter the scale setting of a window
 *
 * \param  g	  gui window
 * \param  scale  scale value (1.0 == normal scale)
 */

void ro_gui_window_set_scale(struct gui_window *g, float scale)
{
	struct content *c;
	g->option.scale = scale;
	g->reformat_pending = true;
	c = g->bw->current_content;
	if ((c) && (c->type != CONTENT_HTML))
		browser_window_update(g->bw, false);
	gui_reformat_pending = true;
}


/**
 * Import text file into window or its toolbar
 *
 * \param  g	     gui window containing textarea
 * \param  filename  pathname of file to be imported
 * \param  toolbar   true iff imported to toolbar rather than main window
 * \return true iff successful
 */

bool ro_gui_window_import_text(struct gui_window *g, const char *filename,
		bool toolbar)
{
	fileswitch_object_type obj_type;
	os_error *error;
	char *buf, *utf8_buf;
	int size;
	utf8_convert_ret ret;

	error = xosfile_read_stamped(filename, &obj_type, NULL, NULL,
			&size, NULL, NULL);
	if (error) {
		LOG(("xosfile_read_stamped: 0x%x:%s",
			error->errnum, error->errmess));
		warn_user("FileError", error->errmess);
		return true;  /* was for us, but it didn't work! */
	}

	buf = malloc(size);
	if (!buf) {
		warn_user("NoMemory", NULL);
		return true;
	}

	error = xosfile_load_stamped(filename, (byte*)buf,
			NULL, NULL, NULL, NULL, NULL);
	if (error) {
		LOG(("xosfile_load_stamped: 0x%x:%s",
			error->errnum, error->errmess));
		warn_user("LoadError", error->errmess);
		free(buf);
		return true;
	}

	ret = utf8_from_local_encoding(buf, size, &utf8_buf);
	if (ret != UTF8_CONVERT_OK) {
		/* bad encoding shouldn't happen */
		assert(ret != UTF8_CONVERT_BADENC);
		LOG(("utf8_from_local_encoding failed"));
		free(buf);
		warn_user("NoMemory", NULL);
		return true;
	}
	size = strlen(utf8_buf);

	if (toolbar) {
		const char *ep = utf8_buf + size;
		const char *sp;
		char *p = utf8_buf;

		/* skip leading whitespace */
		while (isspace(*p)) p++;

		sp = p;
		while (*p && *p != '\r' && *p != '\n')
			p += utf8_next(p, ep - p, 0);
		*p = '\0';

		if (p > sp)
			ro_gui_window_launch_url(g, sp);
	}
	else
		browser_window_paste_text(g->bw, utf8_buf, size, true);

	free(buf);
	free(utf8_buf);
	return true;
}


/**
 * Window is being iconised. Create a suitable thumbnail sprite
 * (which, sadly, must be in the Wimp sprite pool), and return
 * the sprite name and truncated title to the iconiser
 *
 * \param  g   the gui window being iconised
 * \param  wi  the WindowInfo message from the iconiser
 */

void ro_gui_window_iconise(struct gui_window *g, wimp_full_message_window_info *wi)
{
	/* sadly there is no 'legal' way to get the sprite into
	   the Wimp sprite pool other than via a filing system */
	const char *temp_fname = "Pipe:$._tmpfile";
	struct browser_window *bw = g->bw;
	osspriteop_header *overlay = NULL;
	osspriteop_header *sprite_header;
	struct bitmap *bitmap;
	osspriteop_area *area;
	int w = 34, h = 34;
	struct content *c;
	os_error *error;
	int len, id;

	assert(bw);

	c = bw->current_content;
	if (!c) return;

	/* if an overlay sprite is defined, locate it and gets its dimensions
	   so that we can produce a thumbnail with the same dimensions */
	if (!ro_gui_wimp_get_sprite("ic_netsfxx", &overlay)) {
		error = xosspriteop_read_sprite_info(osspriteop_PTR,
				(osspriteop_area *)0x100,
				(osspriteop_id)overlay, &w, &h, NULL, NULL);
		if (error) {
			LOG(("xosspriteop_read_sprite_info: 0x%x: %s",
				error->errnum, error->errmess));
			warn_user("MiscError", error->errmess);
			overlay = NULL;
		}
		else if (sprite_bpp(overlay) != 8) {
			LOG(("overlay sprite is not 8bpp"));
			overlay = NULL;
		}
	}

	/* create the thumbnail sprite */
	bitmap = bitmap_create(w, h, BITMAP_NEW | BITMAP_OPAQUE | BITMAP_CLEAR_MEMORY);
	if (!bitmap) {
		LOG(("Thumbnail initialisation failed."));
		return;
	}
	thumbnail_create(c, bitmap, NULL);
	if (overlay)
		bitmap_overlay_sprite(bitmap, overlay);
	area = thumbnail_convert_8bpp(bitmap);
	bitmap_destroy(bitmap);
	if (!area) {
		LOG(("Thumbnail conversion failed."));
		return;
	}

	/* choose a suitable sprite name */
	id = 0;
	while (iconise_used[id])
		if ((unsigned)++id >= NOF_ELEMENTS(iconise_used)) {
			id = iconise_next;
			if ((unsigned)++iconise_next >=
					NOF_ELEMENTS(iconise_used))
				iconise_next = 0;
			break;
		}

	sprite_header = (osspriteop_header *)(area + 1);
	len = sprintf(sprite_header->name, "ic_netsf%.2d", id);

	error = xosspriteop_save_sprite_file(osspriteop_USER_AREA,
			area, temp_fname);
	if (error) {
		LOG(("xosspriteop_save_sprite_file: 0x%x:%s",
			error->errnum, error->errmess));
		warn_user("MiscError", error->errmess);
		free(area);
		return;
	}

	error = xwimpspriteop_merge_sprite_file(temp_fname);
	if (error) {
		LOG(("xwimpspriteop_merge_sprite_file: 0x%x:%s",
			error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
		remove(temp_fname);
		free(area);
		return;
	}

	memcpy(wi->sprite_name, sprite_header->name + 3, len - 2);	/* inc NUL */
	strncpy(wi->title, g->title, sizeof(wi->title));
	wi->title[sizeof(wi->title) - 1] = '\0';

	if (wimptextop_string_width(wi->title, 0) > 182) {
		/* work around bug in Pinboard where it will fail to display
		 * the icon if the text is very wide */
		if (strlen(wi->title) > 10)
			wi->title[10] = '\0';	/* pinboard does this anyway */
		while (wimptextop_string_width(wi->title, 0) > 182)
			wi->title[strlen(wi->title) - 1] = '\0';
	}

	wi->size = sizeof(wimp_full_message_window_info);
	wi->your_ref = wi->my_ref;
	error = xwimp_send_message(wimp_USER_MESSAGE, (wimp_message*)wi, wi->sender);
	if (error) {
		LOG(("xwimp_send_message: 0x%x:%s",
			error->errnum, error->errmess));
		warn_user("WimpError", error->errmess);
	}
	else {
		g->iconise_icon = id;
		iconise_used[id] = true;
	}

	free(area);
}


/**
 * Navigate up one level
 *
 * \param  g	the gui_window to open the parent link in
 * \param  url  the URL to open the parent of
 */
bool ro_gui_window_navigate_up(struct gui_window *g, const char *url) {
	char *parent;
	url_func_result res;
	bool compare;

	if (!g || (!g->bw))
		return false;

	res = url_parent(url, &parent);
	if (res == URL_FUNC_OK) {
		res = url_compare(url, parent, &compare);
		if (!compare && (res == URL_FUNC_OK))
			browser_window_go(g->bw, parent, 0, true);
		free(parent);
	}
	return true;
}