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/*
* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
* Copyright 2006 James Bursa <bursa@users.sourceforge.net>
* Copyright 2004 Andrew Timmins <atimmins@blueyonder.co.uk>
* Copyright 2004 John Tytgat <joty@netsurf-browser.org>
* Copyright 2006 Richard Wilson <info@tinct.net>
* Copyright 2008 Michael Drake <tlsa@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file
* Browser window creation and manipulation (implementation).
*/
#include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <math.h>
#include <sys/select.h>
#include "curl/curl.h"
#include "utils/config.h"
#include "content/fetch.h"
#include "content/fetchcache.h"
#include "content/urldb.h"
#include "css/css.h"
#ifdef WITH_AUTH
#include "desktop/401login.h"
#endif
#include "desktop/browser.h"
#include "desktop/frames.h"
#include "desktop/history_core.h"
#include "desktop/gui.h"
#include "desktop/options.h"
#include "desktop/selection.h"
#include "desktop/textinput.h"
#include "render/box.h"
#include "render/form.h"
#include "render/font.h"
#include "render/imagemap.h"
#include "render/layout.h"
#include "render/textplain.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/talloc.h"
#include "utils/url.h"
#include "utils/utils.h"
#include "utils/utf8.h"
/** browser window which is being redrawn. Valid only during redraw. */
struct browser_window *current_redraw_browser;
/** fake content for <a> being saved as a link */
struct content browser_window_href_content;
/** one or more windows require a reformat */
bool browser_reformat_pending;
/** maximum frame depth */
#define FRAME_DEPTH 8
static void browser_window_go_post(struct browser_window *bw,
const char *url, char *post_urlenc,
struct form_successful_control *post_multipart,
bool history_add, const char *referer, bool download,
bool verifiable, const char *parent_url);
static void browser_window_callback(content_msg msg, struct content *c,
intptr_t p1, intptr_t p2, union content_msg_data data);
static void browser_window_refresh(void *p);
static bool browser_window_check_throbber(struct browser_window *bw);
static void browser_window_convert_to_download(struct browser_window *bw);
static void browser_window_start_throbber(struct browser_window *bw);
static void browser_window_stop_throbber(struct browser_window *bw);
static void browser_window_set_status(struct browser_window *bw,
const char *text);
static void browser_window_set_pointer(struct gui_window *g,
gui_pointer_shape shape);
static void download_window_callback(fetch_msg msg, void *p, const void *data,
unsigned long size);
static void browser_window_destroy_children(struct browser_window *bw);
static void browser_window_destroy_internal(struct browser_window *bw);
static void browser_window_set_scale_internal(struct browser_window *bw,
float scale);
static struct browser_window *browser_window_find_target(
struct browser_window *bw, const char *target,
browser_mouse_state mouse);
static void browser_window_find_target_internal(struct browser_window *bw,
const char *target, int depth, struct browser_window *page,
int *rdepth, struct browser_window **bw_target);
static void browser_window_mouse_action_html(struct browser_window *bw,
browser_mouse_state mouse, int x, int y);
static void browser_window_mouse_action_text(struct browser_window *bw,
browser_mouse_state mouse, int x, int y);
static void browser_window_mouse_track_html(struct browser_window *bw,
browser_mouse_state mouse, int x, int y);
static void browser_window_mouse_track_text(struct browser_window *bw,
browser_mouse_state mouse, int x, int y);
static const char *browser_window_scrollbar_click(struct browser_window *bw,
browser_mouse_state mouse, struct box *box,
int box_x, int box_y, int x, int y);
static void browser_radio_set(struct content *content,
struct form_control *radio);
static gui_pointer_shape get_pointer_shape(struct box *box, bool imagemap);
static bool browser_window_nearer_text_box(struct box *box, int bx, int by,
int x, int y, int dir, struct box **nearest, int *tx, int *ty,
int *nr_xd, int *nr_yd);
static bool browser_window_nearest_text_box(struct box *box, int bx, int by,
int fx, int fy, int x, int y, int dir, struct box **nearest,
int *tx, int *ty, int *nr_xd, int *nr_yd);
static struct box *browser_window_pick_text_box(struct browser_window *bw,
int x, int y, int dir, int *dx, int *dy);
static void browser_window_page_drag_start(struct browser_window *bw,
int x, int y);
static void browser_window_scroll_box(struct browser_window *bw,
struct box *box, int scroll_x, int scroll_y);
/**
* Create and open a new browser window with the given page.
*
* \param url URL to start fetching in the new window (copied)
* \param clone The browser window to clone
* \param referer The referring uri (copied), or 0 if none
*/
struct browser_window *browser_window_create(const char *url,
struct browser_window *clone,
const char *referer, bool history_add, bool new_tab)
{
struct browser_window *bw;
assert(clone || history_add);
if ((bw = calloc(1, sizeof *bw)) == NULL) {
warn_user("NoMemory", 0);
return NULL;
}
/* Initialise common parts */
browser_window_initialise_common(bw, clone);
/* window characteristics */
bw->browser_window_type = BROWSER_WINDOW_NORMAL;
bw->scrolling = SCROLLING_YES;
bw->border = true;
bw->no_resize = true;
/* gui window */
if ((bw->window = gui_create_browser_window(bw, clone, new_tab)) == NULL) {
browser_window_destroy(bw);
return NULL;
}
if (url)
browser_window_go(bw, url, referer, history_add);
return bw;
}
/**
* Initialise common parts of a browser window
*
* \param bw The window to initialise
* \param clone The window to clone, or NULL if none
*/
void browser_window_initialise_common(struct browser_window *bw,
struct browser_window *clone)
{
assert(bw);
if (!clone)
bw->history = history_create();
else
bw->history = history_clone(clone->history);
/* window characteristics */
bw->sel = selection_create(bw);
bw->refresh_interval = -1;
bw->reformat_pending = false;
bw->drag_type = DRAGGING_NONE;
bw->scale = (float) option_scale / 100.0;
}
/**
* Start fetching a page in a browser window.
*
* \param bw browser window
* \param url URL to start fetching (copied)
* \param referer the referring uri (copied), or 0 if none
*
* Any existing fetches in the window are aborted.
*/
void browser_window_go(struct browser_window *bw, const char *url,
const char *referer, bool history_add)
{
/* All fetches passing through here are verifiable
* (i.e are the result of user action) */
browser_window_go_post(bw, url, 0, 0, history_add, referer,
false, true, referer);
}
/**
* Start a download of the given URL from a browser window.
*
* \param bw browser window
* \param url URL to start downloading (copied)
* \param referer the referring uri (copied), or 0 if none
*/
void browser_window_download(struct browser_window *bw, const char *url,
const char *referrer)
{
browser_window_go_post(bw, url, 0, 0, false, referrer,
true, true, 0);
}
/**
* Start fetching a page in a browser window.
*
* \param bw browser window
* \param url URL to start fetching (copied)
* \param referer the referring uri (copied), or 0 if none
*
* Any existing fetches in the window are aborted.
*/
void browser_window_go_unverifiable(struct browser_window *bw,
const char *url, const char *referer, bool history_add)
{
/* All fetches passing through here are unverifiable
* (i.e are not the result of user action) */
browser_window_go_post(bw, url, 0, 0, history_add, referer,
false, false, referer);
}
/**
* Start fetching a page in a browser window, POSTing form data.
*
* \param bw browser window
* \param url URL to start fetching (copied)
* \param post_urlenc url encoded post data, or 0 if none
* \param post_multipart multipart post data, or 0 if none
* \param history_add add to window history
* \param referer the referring uri (copied), or 0 if none
* \param download download, rather than render the uri
* \param verifiable this transaction is verifiable
* \param parent_url URL of fetch which spawned this one (copied),
* or 0 if none
*
* Any existing fetches in the window are aborted.
*
* If post_urlenc and post_multipart are 0 the url is fetched using GET.
*
* The page is not added to the window history if add_history is false. This
* should be used when returning to a page in the window history.
*/
void browser_window_go_post(struct browser_window *bw, const char *url,
char *post_urlenc,
struct form_successful_control *post_multipart,
bool history_add, const char *referer, bool download,
bool verifiable, const char *parent_url)
{
struct content *c;
char *url2;
char *fragment;
url_func_result res;
char url_buf[256];
int depth = 0;
struct browser_window *cur;
int width, height;
LOG(("bw %p, url %s", bw, url));
assert(bw);
assert(url);
/* don't allow massively nested framesets */
for (cur = bw; cur->parent; cur = cur->parent)
depth++;
if (depth > FRAME_DEPTH) {
LOG(("frame depth too high."));
return;
}
res = url_normalize(url, &url2);
if (res != URL_FUNC_OK) {
LOG(("failed to normalize url %s", url));
return;
}
/* check we can actually handle this URL */
if (!fetch_can_fetch(url2)) {
gui_launch_url(url2);
free(url2);
return;
}
free(bw->frag_id);
bw->frag_id = NULL;
/* find any fragment identifier on end of URL */
res = url_fragment(url2, &fragment);
if (res == URL_FUNC_NOMEM) {
free(url2);
warn_user("NoMemory", 0);
return;
} else if (res == URL_FUNC_OK) {
bool same_url = false;
bw->frag_id = fragment;
/* Compare new URL with existing one (ignoring fragments) */
if (bw->current_content && bw->current_content->url) {
res = url_compare(bw->current_content->url, url2,
true, &same_url);
if (res == URL_FUNC_NOMEM) {
free(url2);
warn_user("NoMemory", 0);
return;
} else if (res == URL_FUNC_FAILED) {
same_url = false;
}
}
/* if we're simply moving to another ID on the same page,
* don't bother to fetch, just update the window.
*/
if (same_url && !post_urlenc && !post_multipart &&
!strchr(url2, '?')) {
free(url2);
browser_window_update(bw, false);
snprintf(url_buf, sizeof url_buf, "%s#%s",
bw->current_content->url, bw->frag_id);
url_buf[sizeof url_buf - 1] = 0;
gui_window_set_url(bw->window, url_buf);
return;
}
}
browser_window_stop(bw);
browser_window_remove_caret(bw);
browser_window_destroy_children(bw);
gui_window_get_dimensions(bw->window, &width, &height, true);
LOG(("Loading '%s' width %i, height %i", url2, width, height));
browser_window_set_status(bw, messages_get("Loading"));
bw->history_add = history_add;
c = fetchcache(url2, browser_window_callback, (intptr_t) bw, 0,
width, height, false,
post_urlenc, post_multipart, verifiable, download);
free(url2);
if (!c) {
browser_window_set_status(bw, messages_get("NoMemory"));
warn_user("NoMemory", 0);
return;
}
bw->loading_content = c;
browser_window_start_throbber(bw);
if (referer && referer != bw->referer) {
free(bw->referer);
bw->referer = strdup(referer);
}
bw->download = download;
fetchcache_go(c, referer, browser_window_callback,
(intptr_t) bw, 0, width, height,
post_urlenc, post_multipart, verifiable, parent_url);
}
/**
* Callback for fetchcache() for browser window fetches.
*/
void browser_window_callback(content_msg msg, struct content *c,
intptr_t p1, intptr_t p2, union content_msg_data data)
{
struct browser_window *bw = (struct browser_window *) p1;
char url[256];
switch (msg) {
case CONTENT_MSG_LOADING:
assert(bw->loading_content == c);
if (c->type == CONTENT_OTHER)
browser_window_convert_to_download(bw);
#ifdef WITH_THEME_INSTALL
else if (c->type == CONTENT_THEME) {
theme_install_start(c);
bw->loading_content = 0;
content_remove_user(c, browser_window_callback,
(intptr_t) bw, 0);
browser_window_stop_throbber(bw);
}
#endif
else {
if (bw->frag_id)
snprintf(url, sizeof url, "%s#%s",
c->url, bw->frag_id);
else
snprintf(url, sizeof url, "%s", c->url);
url[sizeof url - 1] = 0;
gui_window_set_url(bw->window, url);
bw->refresh_interval = -1;
browser_window_set_status(bw, c->status_message);
}
break;
case CONTENT_MSG_READY:
assert(bw->loading_content == c);
if (bw->current_content) {
if (bw->current_content->status ==
CONTENT_STATUS_READY ||
bw->current_content->status ==
CONTENT_STATUS_DONE)
content_close(bw->current_content);
content_remove_user(bw->current_content,
browser_window_callback,
(intptr_t) bw, 0);
}
bw->current_content = c;
bw->loading_content = NULL;
browser_window_remove_caret(bw);
bw->scrolling_box = NULL;
gui_window_new_content(bw->window);
if (bw->frag_id)
snprintf(url, sizeof url, "%s#%s", c->url, bw->frag_id);
else
snprintf(url, sizeof url, "%s", c->url);
url[sizeof url - 1] = 0;
gui_window_set_url(bw->window, url);
browser_window_update(bw, true);
content_open(c, bw, 0, 0, 0, 0);
browser_window_set_status(bw, c->status_message);
/* history */
if (bw->history_add && bw->history) {
history_add(bw->history, c, bw->frag_id);
if (urldb_add_url(c->url)) {
urldb_set_url_title(c->url,
c->title ? c->title : c->url);
urldb_update_url_visit_data(c->url);
urldb_set_url_content_type(c->url,
c->type);
/* This is safe as we've just
* added the URL */
global_history_add(
urldb_get_url(c->url));
}
}
/* text selection */
if (c->type == CONTENT_HTML)
selection_init(bw->sel,
bw->current_content->data.html.layout);
if (c->type == CONTENT_TEXTPLAIN)
selection_init(bw->sel, NULL);
/* frames */
if (c->type == CONTENT_HTML && c->data.html.frameset)
browser_window_create_frameset(bw,
c->data.html.frameset);
if (c->type == CONTENT_HTML && c->data.html.iframe)
browser_window_create_iframes(bw, c->data.html.iframe);
break;
case CONTENT_MSG_DONE:
assert(bw->current_content == c);
browser_window_update(bw, false);
browser_window_set_status(bw, c->status_message);
browser_window_stop_throbber(bw);
history_update(bw->history, c);
hotlist_visited(c);
free(bw->referer);
bw->referer = 0;
if (bw->refresh_interval != -1)
schedule(bw->refresh_interval,
browser_window_refresh, bw);
break;
case CONTENT_MSG_ERROR:
browser_window_set_status(bw, data.error);
/* Only warn the user about errors in top-level windows */
if (bw->browser_window_type == BROWSER_WINDOW_NORMAL)
warn_user(data.error, 0);
if (c == bw->loading_content)
bw->loading_content = 0;
else if (c == bw->current_content) {
bw->current_content = 0;
browser_window_remove_caret(bw);
bw->scrolling_box = NULL;
selection_init(bw->sel, NULL);
}
browser_window_stop_throbber(bw);
free(bw->referer);
bw->referer = 0;
break;
case CONTENT_MSG_STATUS:
browser_window_set_status(bw, c->status_message);
break;
case CONTENT_MSG_REFORMAT:
if (c == bw->current_content &&
c->type == CONTENT_HTML) {
/* reposition frames */
if (c->data.html.frameset)
browser_window_recalculate_frameset(bw);
/* reflow iframe positions */
if (c->data.html.iframe)
browser_window_recalculate_iframes(bw);
/* box tree may have changed, need to relabel */
selection_reinit(bw->sel, c->data.html.layout);
}
if (bw->move_callback)
bw->move_callback(bw, bw->caret_p);
browser_window_update(bw, false);
break;
case CONTENT_MSG_REDRAW:
gui_window_update_box(bw->window, &data);
break;
case CONTENT_MSG_NEWPTR:
bw->loading_content = c;
if (data.new_url) {
/* Replacement URL too, so check for new fragment */
char *fragment;
url_func_result res;
/* Remove any existing fragment */
free(bw->frag_id);
bw->frag_id = NULL;
/* Extract new one, if any */
res = url_fragment(data.new_url, &fragment);
if (res == URL_FUNC_OK) {
/* Save for later use */
bw->frag_id = fragment;
}
/* Ignore memory exhaustion here -- it'll simply result
* in the window being scrolled to the top rather than
* to the fragment. That's acceptable, given that it's
* likely that more important things will complain
* about memory shortage. */
}
break;
case CONTENT_MSG_LAUNCH:
assert(data.launch_url != NULL);
bw->loading_content = NULL;
gui_launch_url(data.launch_url);
browser_window_stop_throbber(bw);
free(bw->referer);
bw->referer = 0;
break;
#ifdef WITH_AUTH
case CONTENT_MSG_AUTH:
gui_401login_open(bw, c, data.auth_realm);
if (c == bw->loading_content)
bw->loading_content = 0;
else if (c == bw->current_content) {
bw->current_content = 0;
browser_window_remove_caret(bw);
bw->scrolling_box = NULL;
selection_init(bw->sel, NULL);
}
browser_window_stop_throbber(bw);
free(bw->referer);
bw->referer = 0;
break;
#endif
case CONTENT_MSG_SSL:
gui_cert_verify(bw, c, data.ssl.certs, data.ssl.num);
if (c == bw->loading_content)
bw->loading_content = 0;
else if (c == bw->current_content) {
bw->current_content = 0;
browser_window_remove_caret(bw);
bw->scrolling_box = NULL;
selection_init(bw->sel, NULL);
}
browser_window_stop_throbber(bw);
free(bw->referer);
bw->referer = 0;
break;
case CONTENT_MSG_REFRESH:
bw->refresh_interval = data.delay * 100;
break;
default:
assert(0);
}
}
/**
* Transfer the loading_content to a new download window.
*/
void browser_window_convert_to_download(struct browser_window *bw)
{
struct gui_download_window *download_window;
struct content *c = bw->loading_content;
struct fetch *fetch;
assert(c);
fetch = c->fetch;
if (fetch) {
/* create download window */
download_window = gui_download_window_create(c->url,
c->mime_type, fetch, c->total_size,
bw->window);
if (download_window) {
/* extract fetch from content */
c->fetch = 0;
c->fresh = false;
fetch_change_callback(fetch, download_window_callback,
download_window);
}
} else {
/* must already be a download window for this fetch */
/** \todo open it at top of stack */
}
/* remove content from browser window */
bw->loading_content = 0;
content_remove_user(c, browser_window_callback, (intptr_t) bw, 0);
browser_window_stop_throbber(bw);
}
/**
* Handle meta http-equiv refresh time elapsing by loading a new page.
*
* \param p browser window to refresh with new page
*/
void browser_window_refresh(void *p)
{
struct browser_window *bw = p;
bool history_add = true;
assert(bw->current_content &&
(bw->current_content->status == CONTENT_STATUS_READY ||
bw->current_content->status == CONTENT_STATUS_DONE));
/* Ignore if the refresh URL has gone
* (may happen if a fetch error occurred) */
if (!bw->current_content->refresh)
return;
/* mark this content as invalid so it gets flushed from the cache */
bw->current_content->fresh = false;
if ((bw->current_content->url) &&
(bw->current_content->refresh) &&
(!strcmp(bw->current_content->url,
bw->current_content->refresh)))
history_add = false;
browser_window_go_unverifiable(bw, bw->current_content->refresh,
bw->current_content->url, history_add);
}
/**
* Start the busy indicator.
*
* \param bw browser window
*/
void browser_window_start_throbber(struct browser_window *bw)
{
bw->throbbing = true;
while (bw->parent)
bw = bw->parent;
gui_window_start_throbber(bw->window);
}
/**
* Stop the busy indicator.
*
* \param bw browser window
*/
void browser_window_stop_throbber(struct browser_window *bw)
{
bw->throbbing = false;
while (bw->parent)
bw = bw->parent;
if (!browser_window_check_throbber(bw))
gui_window_stop_throbber(bw->window);
}
bool browser_window_check_throbber(struct browser_window *bw)
{
int children, index;
if (bw->throbbing)
return true;
if (bw->children) {
children = bw->rows * bw->cols;
for (index = 0; index < children; index++) {
if (browser_window_check_throbber(&bw->children[index]))
return true;
}
}
if (bw->iframes) {
for (index = 0; index < bw->iframe_count; index++) {
if (browser_window_check_throbber(&bw->iframes[index]))
return true;
}
}
return false;
}
/**
* Redraw browser window, set extent to content, and update title.
*
* \param bw browser_window
* \param scroll_to_top move view to top of page
*/
void browser_window_update(struct browser_window *bw,
bool scroll_to_top)
{
struct box *pos;
int x, y;
if (!bw->current_content)
return;
if (bw->current_content->title != NULL) {
gui_window_set_title(bw->window, bw->current_content->title);
} else
gui_window_set_title(bw->window, bw->current_content->url);
gui_window_update_extent(bw->window);
if (scroll_to_top)
gui_window_set_scroll(bw->window, 0, 0);
/* todo: don't do this if the user has scrolled */
/* if frag_id exists, then try to scroll to it */
if (bw->frag_id && bw->current_content->type == CONTENT_HTML) {
if ((pos = box_find_by_id(bw->current_content->data.html.layout, bw->frag_id)) != 0) {
box_coords(pos, &x, &y);
gui_window_set_scroll(bw->window, x, y);
}
}
gui_window_redraw_window(bw->window);
}
/**
* Stop all fetching activity in a browser window.
*
* \param bw browser window
*/
void browser_window_stop(struct browser_window *bw)
{
int children, index;
if (bw->loading_content) {
content_remove_user(bw->loading_content,
browser_window_callback, (intptr_t) bw, 0);
bw->loading_content = 0;
}
if (bw->current_content &&
bw->current_content->status != CONTENT_STATUS_DONE) {
assert(bw->current_content->status == CONTENT_STATUS_READY);
content_stop(bw->current_content,
browser_window_callback, (intptr_t) bw, 0);
}
schedule_remove(browser_window_refresh, bw);
if (bw->children) {
children = bw->rows * bw->cols;
for (index = 0; index < children; index++)
browser_window_stop(&bw->children[index]);
}
if (bw->iframes) {
children = bw->iframe_count;
for (index = 0; index < children; index++)
browser_window_stop(&bw->iframes[index]);
}
browser_window_stop_throbber(bw);
}
/**
* Reload the page in a browser window.
*
* \param bw browser window
* \param all whether to reload all objects associated with the page
*/
void browser_window_reload(struct browser_window *bw, bool all)
{
struct content *c;
unsigned int i;
if (!bw->current_content || bw->loading_content)
return;
if (all && bw->current_content->type == CONTENT_HTML) {
c = bw->current_content;
/* invalidate objects */
for (i = 0; i != c->data.html.object_count; i++) {
if (c->data.html.object[i].content)
c->data.html.object[i].content->fresh = false;
}
/* invalidate stylesheets */
for (i = STYLESHEET_START; i != c->data.html.stylesheet_count;
i++) {
if (c->data.html.stylesheet_content[i])
c->data.html.stylesheet_content[i]->fresh =
false;
}
}
bw->current_content->fresh = false;
browser_window_go_post(bw, bw->current_content->url, 0, 0,
false, 0, false, true, 0);
}
/**
* Change the status bar of a browser window.
*
* \param bw browser window
* \param text new status text (copied)
*/
void browser_window_set_status(struct browser_window *bw, const char *text)
{
while (bw->parent)
bw = bw->parent;
gui_window_set_status(bw->window, text);
}
/**
* Change the shape of the mouse pointer
*
* \param shape shape to use
*/
void browser_window_set_pointer(struct gui_window *g, gui_pointer_shape shape)
{
gui_window_set_pointer(g, shape);
}
/**
* Close and destroy a browser window.
*
* \param bw browser window
*/
void browser_window_destroy(struct browser_window *bw)
{
/* can't destoy child windows on their own */
assert(!bw->parent);
/* destroy */
browser_window_destroy_internal(bw);
free(bw);
}
/**
* Close and destroy all child browser window.
*
* \param bw browser window
*/
void browser_window_destroy_children(struct browser_window *bw)
{
int i;
if (bw->children) {
for (i = 0; i < (bw->rows * bw->cols); i++)
browser_window_destroy_internal(&bw->children[i]);
free(bw->children);
bw->children = NULL;
bw->rows = 0;
bw->cols = 0;
}
if (bw->iframes) {
for (i = 0; i < bw->iframe_count; i++)
browser_window_destroy_internal(&bw->iframes[i]);
free(bw->iframes);
bw->iframes = NULL;
bw->iframe_count = 0;
}
}
/**
* Release all memory associated with a browser window.
*
* \param bw browser window
*/
void browser_window_destroy_internal(struct browser_window *bw)
{
assert(bw);
LOG(("Destroying window"));
if ((bw->children) || (bw->iframes))
browser_window_destroy_children(bw);
if (bw->loading_content) {
content_remove_user(bw->loading_content,
browser_window_callback, (intptr_t) bw, 0);
bw->loading_content = 0;
}
if (bw->current_content) {
if (bw->current_content->status == CONTENT_STATUS_READY ||
bw->current_content->status ==
CONTENT_STATUS_DONE)
content_close(bw->current_content);
content_remove_user(bw->current_content,
browser_window_callback, (intptr_t) bw, 0);
bw->current_content = 0;
}
schedule_remove(browser_window_refresh, bw);
selection_destroy(bw->sel);
history_destroy(bw->history);
gui_window_destroy(bw->window);
free(bw->name);
free(bw->frag_id);
}
/**
* Returns the browser window that is responsible for the child.
*
* \param bw The browser window to find the owner of
* \return the browser window's owner
*/
struct browser_window *browser_window_owner(struct browser_window *bw)
{
/* an iframe's parent is just the parent window */
if (bw->browser_window_type == BROWSER_WINDOW_IFRAME)
return bw->parent;
/* the parent of a frameset is either a NORMAL window or an IFRAME */
while (bw->parent) {
switch (bw->browser_window_type) {
case BROWSER_WINDOW_NORMAL:
case BROWSER_WINDOW_IFRAME:
return bw;
case BROWSER_WINDOW_FRAME:
case BROWSER_WINDOW_FRAMESET:
bw = bw->parent;
break;
}
}
return bw;
}
/**
* Reformat a browser window contents to a new width or height.
*
* \param bw the browser window to reformat
* \param width new width
* \param height new height
*/
void browser_window_reformat(struct browser_window *bw, int width, int height)
{
struct content *c = bw->current_content;
if (!c)
return;
content_reformat(c, width / bw->scale, height / bw->scale);
}
/**
* Sets the scale of a browser window
*
* \param bw The browser window to scale
* \param scale The new scale
* \param all Scale all windows in the tree (ie work up aswell as down)
*/
void browser_window_set_scale(struct browser_window *bw, float scale, bool all)
{
while (bw->parent && all)
bw = bw->parent;
browser_window_set_scale_internal(bw, scale);
if (bw->parent)
bw = bw->parent;
browser_window_recalculate_frameset(bw);
}
void browser_window_set_scale_internal(struct browser_window *bw, float scale)
{
int i;
struct content *c;
if (fabs(bw->scale-scale) < 0.0001)
return;
bw->scale = scale;
c = bw->current_content;
if (c) {
if (!content_can_reformat(c)) {
browser_window_update(bw, false);
} else {
bw->reformat_pending = true;
browser_reformat_pending = true;
}
}
gui_window_set_scale(bw->window, scale);
for (i = 0; i < (bw->cols * bw->rows); i++)
browser_window_set_scale_internal(&bw->children[i], scale);
for (i = 0; i < bw->iframe_count; i++)
browser_window_set_scale_internal(&bw->iframes[i], scale);
}
/**
* Locate a browser window in the specified stack according.
*
* \param bw the browser_window to search all relatives of
* \param target the target to locate
* \param new_window always return a new window (ie 'Open Link in New Window')
*/
struct browser_window *browser_window_find_target(struct browser_window *bw,
const char *target, browser_mouse_state mouse)
{
struct browser_window *bw_target;
struct browser_window *top;
struct content *c;
int rdepth;
/* use the base target if we don't have one */
c = bw->current_content;
if (!target && c && c->data.html.base_target)
target = c->data.html.base_target;
if (!target)
target = TARGET_SELF;
/* allow the simple case of target="_blank" to be ignored if requested
*/
if ((!(mouse & BROWSER_MOUSE_CLICK_2)) &&
(!((mouse & BROWSER_MOUSE_CLICK_2) &&
(mouse & BROWSER_MOUSE_MOD_2))) &&
(!option_target_blank)) {
/* not a mouse button 2 click
* not a mouse button 1 click with ctrl pressed
* configured to ignore target="_blank" */
if ((target == TARGET_BLANK) || (!strcasecmp(target, "_blank")))
return bw;
}
/* handle reserved keywords */
if (((option_button_2_tab) && (mouse & BROWSER_MOUSE_CLICK_2)) ||
((!option_button_2_tab) &&
((mouse & BROWSER_MOUSE_CLICK_1) &&
(mouse & BROWSER_MOUSE_MOD_2))) ||
((option_button_2_tab) && ((target == TARGET_BLANK) ||
(!strcasecmp(target, "_blank"))))) {
/* open in new tab if:
* - button_2 opens in new tab and button_2 was pressed
* OR
* - button_2 doesn't open in new tabs and button_1 was
* pressed with ctrl held
* OR
* - button_2 opens in new tab and the link target is "_blank"
*/
bw_target = browser_window_create(NULL, bw, NULL, false, true);
if (!bw_target)
return bw;
return bw_target;
} else if (((!option_button_2_tab) &&
(mouse & BROWSER_MOUSE_CLICK_2)) ||
((option_button_2_tab) &&
((mouse & BROWSER_MOUSE_CLICK_1) &&
(mouse & BROWSER_MOUSE_MOD_2))) ||
((!option_button_2_tab) && ((target == TARGET_BLANK) ||
(!strcasecmp(target, "_blank"))))) {
/* open in new window if:
* - button_2 doesn't open in new tabs and button_2 was pressed
* OR
* - button_2 opens in new tab and button_1 was pressed with
* ctrl held
* OR
* - button_2 doesn't open in new tabs and the link target is
* "_blank"
*/
bw_target = browser_window_create(NULL, bw, NULL, false, false);
if (!bw_target)
return bw;
return bw_target;
} else if ((target == TARGET_SELF) || (!strcasecmp(target, "_self"))) {
return bw;
} else if ((target == TARGET_PARENT) ||
(!strcasecmp(target, "_parent"))) {
if (bw->parent)
return bw->parent;
return bw;
} else if ((target == TARGET_TOP) || (!strcasecmp(target, "_top"))) {
while (bw->parent)
bw = bw->parent;
return bw;
}
/* find frame according to B.8, ie using the following priorities:
*
* 1) current frame
* 2) closest to front
*/
rdepth = -1;
bw_target = NULL;
for (top = bw; top->parent; top = top->parent);
browser_window_find_target_internal(top, target, 0, bw, &rdepth, &bw_target);
if (bw_target)
return bw_target;
/* we require a new window using the target name */
if (!option_target_blank)
return bw;
bw_target = browser_window_create(NULL, bw, NULL, false, false);
if (!bw_target)
return bw;
/* frame names should begin with an alphabetic character (a-z,A-Z), however in
* practice you get things such as '_new' and '2left'. The only real effect this
* has is when giving out names as it can be assumed that an author intended '_new'
* to create a new nameless window (ie '_blank') whereas in the case of '2left' the
* intention was for a new named window. As such we merely special case windows that
* begin with an underscore. */
if (target[0] != '_') {
bw_target->name = strdup(target);
if (!bw_target->name)
warn_user("NoMemory", 0);
}
return bw_target;
}
void browser_window_find_target_internal(struct browser_window *bw, const char *target,
int depth, struct browser_window *page, int *rdepth, struct browser_window **bw_target)
{
int i;
if ((bw->name) && (!strcasecmp(bw->name, target))) {
if ((bw == page) || (depth > *rdepth)) {
*rdepth = depth;
*bw_target = bw;
}
}
if ((!bw->children) && (!bw->iframes))
return;
depth++;
for (i = 0; i < (bw->cols * bw->rows); i++) {
if ((bw->children[i].name) && (!strcasecmp(bw->children[i].name, target))) {
if ((page == &bw->children[i]) || (depth > *rdepth)) {
*rdepth = depth;
*bw_target = &bw->children[i];
}
}
if (bw->children[i].children)
browser_window_find_target_internal(&bw->children[i], target, depth,
page, rdepth, bw_target);
}
for (i = 0; i < bw->iframe_count; i++)
browser_window_find_target_internal(&bw->iframes[i], target, depth, page,
rdepth, bw_target);
}
/**
* Callback for fetch for download window fetches.
*/
void download_window_callback(fetch_msg msg, void *p, const void *data,
unsigned long size)
{
struct gui_download_window *download_window = p;
switch (msg) {
case FETCH_PROGRESS:
break;
case FETCH_DATA:
gui_download_window_data(download_window, data, size);
break;
case FETCH_FINISHED:
gui_download_window_done(download_window);
break;
case FETCH_ERROR:
gui_download_window_error(download_window, data);
break;
case FETCH_TYPE:
case FETCH_NOTMODIFIED:
case FETCH_AUTH:
case FETCH_CERT_ERR:
default:
/* not possible */
assert(0);
break;
}
}
/**
* Handle mouse clicks in a browser window.
*
* \param bw browser window
* \param mouse state of mouse buttons and modifier keys
* \param x coordinate of mouse
* \param y coordinate of mouse
*/
void browser_window_mouse_click(struct browser_window *bw,
browser_mouse_state mouse, int x, int y)
{
struct content *c = bw->current_content;
if (!c)
return;
switch (c->type) {
case CONTENT_HTML:
browser_window_mouse_action_html(bw, mouse, x, y);
break;
case CONTENT_TEXTPLAIN:
browser_window_mouse_action_text(bw, mouse, x, y);
break;
default:
if (mouse & BROWSER_MOUSE_MOD_2) {
if (mouse & BROWSER_MOUSE_DRAG_2)
gui_drag_save_object(GUI_SAVE_OBJECT_NATIVE, c,
bw->window);
else if (mouse & BROWSER_MOUSE_DRAG_1)
gui_drag_save_object(GUI_SAVE_OBJECT_ORIG, c,
bw->window);
}
else if (mouse & (BROWSER_MOUSE_DRAG_1 |
BROWSER_MOUSE_DRAG_2)) {
browser_window_page_drag_start(bw, x, y);
browser_window_set_pointer(bw->window, GUI_POINTER_MOVE);
}
break;
}
}
/**
* Handle mouse clicks and movements in an HTML content window.
*
* \param bw browser window
* \param mouse state of mouse buttons and modifier keys
* \param x coordinate of mouse
* \param y coordinate of mouse
*
* This function handles both hovering and clicking. It is important that the
* code path is identical (except that hovering doesn't carry out the action),
* so that the status bar reflects exactly what will happen. Having separate
* code paths opens the possibility that an attacker will make the status bar
* show some harmless action where clicking will be harmful.
*/
void browser_window_mouse_action_html(struct browser_window *bw,
browser_mouse_state mouse, int x, int y)
{
enum { ACTION_NONE, ACTION_SUBMIT, ACTION_GO } action = ACTION_NONE;
char *base_url = 0;
char *title = 0;
const char *url = 0;
const char *target = 0;
char status_buffer[200];
const char *status = 0;
gui_pointer_shape pointer = GUI_POINTER_DEFAULT;
bool imagemap = false;
int box_x = 0, box_y = 0;
int gadget_box_x = 0, gadget_box_y = 0;
int scroll_box_x = 0, scroll_box_y = 0;
int text_box_x = 0, text_box_y = 0;
struct box *url_box = 0;
struct box *gadget_box = 0;
struct box *scroll_box = 0;
struct box *text_box = 0;
struct content *c = bw->current_content;
struct box *box;
struct content *content = c;
struct content *gadget_content = c;
struct content *url_content = c;
struct form_control *gadget = 0;
struct content *object = NULL;
struct box *next_box;
bw->drag_type = DRAGGING_NONE;
bw->scrolling_box = NULL;
/* search the box tree for a link, imagemap, form control, or
* box with scrollbars */
box = c->data.html.layout;
/* Consider the margins of the html page now */
box_x = box->margin[LEFT];
box_y = box->margin[TOP];
while ((next_box = box_at_point(box, x, y, &box_x, &box_y, &content)) !=
NULL) {
box = next_box;
if (box->style &&
box->style->visibility == CSS_VISIBILITY_HIDDEN)
continue;
if (box->object)
object = box->object;
if (box->href) {
url_content = content;
url = box->href;
target = box->target;
url_box = box;
}
if (box->usemap) {
url = imagemap_get(content, box->usemap,
box_x, box_y, x, y, &target);
if (url) {
imagemap = true;
url_box = box;
}
}
if (box->gadget) {
gadget_content = content;
base_url = content->data.html.base_url;
gadget = box->gadget;
gadget_box = box;
gadget_box_x = box_x;
gadget_box_y = box_y;
if (gadget->form)
target = gadget->form->target;
}
if (box->title)
title = box->title;
if (box->style && box->style->cursor != CSS_CURSOR_UNKNOWN)
pointer = get_pointer_shape(box, false);
if (box->style && box->type != BOX_BR &&
box->type != BOX_INLINE &&
box->type != BOX_TEXT &&
(box->style->overflow == CSS_OVERFLOW_SCROLL ||
box->style->overflow == CSS_OVERFLOW_AUTO) &&
((box_vscrollbar_present(box) &&
box_x + box->scroll_x + box->padding[LEFT] +
box->width < x) ||
(box_hscrollbar_present(box) &&
box_y + box->scroll_y + box->padding[TOP] +
box->height < y))) {
scroll_box = box;
scroll_box_x = box_x + box->scroll_x;
scroll_box_y = box_y + box->scroll_y;
}
if (box->text && !box->object) {
text_box = box;
text_box_x = box_x;
text_box_y = box_y;
}
}
/* use of box_x, box_y, or content below this point is probably a
* mistake; they will refer to the last box returned by box_at_point */
if (scroll_box) {
status = browser_window_scrollbar_click(bw, mouse, scroll_box,
scroll_box_x, scroll_box_y,
x - scroll_box_x, y - scroll_box_y);
} else if (gadget) {
switch (gadget->type) {
case GADGET_SELECT:
status = messages_get("FormSelect");
pointer = GUI_POINTER_MENU;
if (mouse & BROWSER_MOUSE_CLICK_1)
gui_create_form_select_menu(bw, gadget);
break;
case GADGET_CHECKBOX:
status = messages_get("FormCheckbox");
if (mouse & BROWSER_MOUSE_CLICK_1) {
gadget->selected = !gadget->selected;
browser_redraw_box(gadget_content, gadget_box);
}
break;
case GADGET_RADIO:
status = messages_get("FormRadio");
if (mouse & BROWSER_MOUSE_CLICK_1)
browser_radio_set(gadget_content, gadget);
break;
case GADGET_IMAGE:
if (mouse & BROWSER_MOUSE_CLICK_1) {
gadget->data.image.mx = x - gadget_box_x;
gadget->data.image.my = y - gadget_box_y;
}
/* drop through */
case GADGET_SUBMIT:
if (gadget->form) {
snprintf(status_buffer, sizeof status_buffer,
messages_get("FormSubmit"),
gadget->form->action);
status = status_buffer;
pointer = get_pointer_shape(gadget_box, false);
if (mouse & (BROWSER_MOUSE_CLICK_1 |
BROWSER_MOUSE_CLICK_2))
action = ACTION_SUBMIT;
} else {
status = messages_get("FormBadSubmit");
}
break;
case GADGET_TEXTAREA:
status = messages_get("FormTextarea");
pointer = get_pointer_shape(gadget_box, false);
if (mouse & (BROWSER_MOUSE_PRESS_1 |
BROWSER_MOUSE_PRESS_2)) {
if (text_box && selection_root(bw->sel) !=
gadget_box)
selection_init(bw->sel, gadget_box);
browser_window_textarea_click(bw,
mouse,
gadget_box,
gadget_box_x,
gadget_box_y,
x - gadget_box_x,
y - gadget_box_y);
}
if (text_box) {
int pixel_offset;
size_t idx;
nsfont.font_position_in_string(text_box->style,
text_box->text,
text_box->length,
x - gadget_box_x - text_box->x,
&idx,
&pixel_offset);
selection_click(bw->sel, mouse,
text_box->byte_offset + idx);
if (selection_dragging(bw->sel)) {
bw->drag_type = DRAGGING_SELECTION;
status = messages_get("Selecting");
} else
status = c->status_message;
}
else if (mouse & BROWSER_MOUSE_PRESS_1)
selection_clear(bw->sel, true);
break;
case GADGET_TEXTBOX:
case GADGET_PASSWORD:
status = messages_get("FormTextbox");
pointer = get_pointer_shape(gadget_box, false);
if ((mouse & BROWSER_MOUSE_PRESS_1) &&
!(mouse & (BROWSER_MOUSE_MOD_1 |
BROWSER_MOUSE_MOD_2))) {
browser_window_input_click(bw,
gadget_box,
gadget_box_x,
gadget_box_y,
x - gadget_box_x,
y - gadget_box_y);
}
if (text_box) {
int pixel_offset;
size_t idx;
if (mouse & (BROWSER_MOUSE_DRAG_1 |
BROWSER_MOUSE_DRAG_2))
selection_init(bw->sel, gadget_box);
nsfont.font_position_in_string(text_box->style,
text_box->text,
text_box->length,
x - gadget_box_x - text_box->x,
&idx,
&pixel_offset);
selection_click(bw->sel, mouse,
text_box->byte_offset + idx);
if (selection_dragging(bw->sel))
bw->drag_type = DRAGGING_SELECTION;
}
else if (mouse & BROWSER_MOUSE_PRESS_1)
selection_clear(bw->sel, true);
break;
case GADGET_HIDDEN:
/* not possible: no box generated */
break;
case GADGET_RESET:
status = messages_get("FormReset");
break;
case GADGET_FILE:
status = messages_get("FormFile");
break;
case GADGET_BUTTON:
/* This gadget cannot be activated */
status = messages_get("FormButton");
break;
}
} else if (object && (mouse & BROWSER_MOUSE_MOD_2)) {
if (mouse & BROWSER_MOUSE_DRAG_2)
gui_drag_save_object(GUI_SAVE_OBJECT_NATIVE, object,
bw->window);
else if (mouse & BROWSER_MOUSE_DRAG_1)
gui_drag_save_object(GUI_SAVE_OBJECT_ORIG, object,
bw->window);
/* \todo should have a drag-saving object msg */
status = c->status_message;
} else if (url) {
if (title) {
snprintf(status_buffer, sizeof status_buffer, "%s: %s",
url, title);
status = status_buffer;
} else
status = url;
pointer = get_pointer_shape(url_box, imagemap);
if (mouse & BROWSER_MOUSE_CLICK_1 &&
mouse & BROWSER_MOUSE_MOD_1) {
/* force download of link */
browser_window_go_post(bw, url, 0, 0, false,
c->url, true, true, 0);
} else if (mouse & BROWSER_MOUSE_CLICK_2 &&
mouse & BROWSER_MOUSE_MOD_1) {
free(browser_window_href_content.url);
browser_window_href_content.url = strdup(url);
if (!browser_window_href_content.url)
warn_user("NoMemory", 0);
else
gui_window_save_as_link(bw->window,
&browser_window_href_content);
} else if (mouse & (BROWSER_MOUSE_CLICK_1 |
BROWSER_MOUSE_CLICK_2))
action = ACTION_GO;
} else {
bool done = false;
/* frame resizing */
if (bw->parent) {
struct browser_window *parent;
for (parent = bw->parent; parent->parent;
parent = parent->parent);
browser_window_resize_frames(parent, mouse,
x + bw->x0, y + bw->y0,
&pointer, &status, &done);
}
/* if clicking in the main page, remove the selection from any
* text areas */
if (!done) {
if (text_box &&
(mouse & (BROWSER_MOUSE_CLICK_1 |
BROWSER_MOUSE_CLICK_2)) &&
selection_root(bw->sel) != c->data.html.layout)
selection_init(bw->sel, c->data.html.layout);
if (text_box) {
int pixel_offset;
size_t idx;
nsfont.font_position_in_string(text_box->style,
text_box->text,
text_box->length,
x - text_box_x,
&idx,
&pixel_offset);
if (selection_click(bw->sel, mouse,
text_box->byte_offset + idx)) {
/* key presses must be directed at the
* main browser window, paste text
* operations ignored */
if (selection_dragging(bw->sel)) {
bw->drag_type =
DRAGGING_SELECTION;
status =
messages_get("Selecting");
} else
status = c->status_message;
done = true;
}
}
else if (mouse & BROWSER_MOUSE_PRESS_1)
selection_clear(bw->sel, true);
}
if (!done) {
if (title)
status = title;
else if (bw->loading_content)
status = bw->loading_content->status_message;
else
status = c->status_message;
if (mouse & BROWSER_MOUSE_DRAG_1) {
if (mouse & BROWSER_MOUSE_MOD_2) {
gui_drag_save_object(GUI_SAVE_COMPLETE,
c, bw->window);
} else {
browser_window_page_drag_start(bw,
x, y);
pointer = GUI_POINTER_MOVE;
}
}
else if (mouse & BROWSER_MOUSE_DRAG_2) {
if (mouse & BROWSER_MOUSE_MOD_2) {
gui_drag_save_object(GUI_SAVE_SOURCE,
c, bw->window);
} else {
browser_window_page_drag_start(bw,
x, y);
pointer = GUI_POINTER_MOVE;
}
}
}
if ((mouse & BROWSER_MOUSE_CLICK_1) &&
!selection_defined(bw->sel)) {
/* ensure key presses still act on the browser window */
browser_window_remove_caret(bw);
}
}
assert(status);
browser_window_set_status(bw, status);
browser_window_set_pointer(bw->window, pointer);
/* deferred actions that can cause this browser_window to be destroyed
and must therefore be done after set_status/pointer
*/
switch (action) {
case ACTION_SUBMIT:
browser_form_submit(bw,
browser_window_find_target(bw, target, mouse),
gadget->form, gadget);
break;
case ACTION_GO:
browser_window_go(browser_window_find_target(bw, target, mouse),
url, c->url, true);
break;
case ACTION_NONE:
break;
}
}
/**
* Handle mouse clicks and movements in a TEXTPLAIN content window.
*
* \param bw browser window
* \param click type of mouse click
* \param x coordinate of mouse
* \param y coordinate of mouse
*
* This function handles both hovering and clicking. It is important that the
* code path is identical (except that hovering doesn't carry out the action),
* so that the status bar reflects exactly what will happen. Having separate
* code paths opens the possibility that an attacker will make the status bar
* show some harmless action where clicking will be harmful.
*/
void browser_window_mouse_action_text(struct browser_window *bw,
browser_mouse_state mouse, int x, int y)
{
struct content *c = bw->current_content;
gui_pointer_shape pointer = GUI_POINTER_DEFAULT;
const char *status = 0;
size_t idx;
int dir = 0;
bw->drag_type = DRAGGING_NONE;
if (!bw->sel) return;
idx = textplain_offset_from_coords(c, x, y, dir);
if (selection_click(bw->sel, mouse, idx)) {
if (selection_dragging(bw->sel)) {
bw->drag_type = DRAGGING_SELECTION;
status = messages_get("Selecting");
}
else
status = c->status_message;
}
else {
if (bw->loading_content)
status = bw->loading_content->status_message;
else
status = c->status_message;
if (mouse & (BROWSER_MOUSE_DRAG_1 | BROWSER_MOUSE_DRAG_2)) {
browser_window_page_drag_start(bw, x, y);
pointer = GUI_POINTER_MOVE;
}
}
assert(status);
browser_window_set_status(bw, status);
browser_window_set_pointer(bw->window, pointer);
}
/**
* Handle mouse movements in a browser window.
*
* \param bw browser window
* \param mouse state of mouse buttons and modifier keys
* \param x coordinate of mouse
* \param y coordinate of mouse
*/
void browser_window_mouse_track(struct browser_window *bw,
browser_mouse_state mouse, int x, int y)
{
struct content *c = bw->current_content;
if ((!c) && (bw->drag_type != DRAGGING_FRAME))
return;
/* detect end of drag operation in case the platform-specific code
doesn't call browser_mouse_drag_end() (RISC OS code does) */
if (bw->drag_type != DRAGGING_NONE && !mouse) {
browser_window_mouse_drag_end(bw, mouse, x, y);
}
if (bw->drag_type == DRAGGING_FRAME) {
browser_window_resize_frame(bw, bw->x0 + x, bw->y0 + y);
} else if (bw->drag_type == DRAGGING_PAGE_SCROLL) {
/* mouse movement since drag started */
int scrollx = bw->drag_start_x - x;
int scrolly = bw->drag_start_y - y;
/* new scroll offsets */
scrollx += bw->drag_start_scroll_x;
scrolly += bw->drag_start_scroll_y;
bw->drag_start_scroll_x = scrollx;
bw->drag_start_scroll_y = scrolly;
gui_window_set_scroll(bw->window, scrollx, scrolly);
} else switch (c->type) {
case CONTENT_HTML:
browser_window_mouse_track_html(bw, mouse, x, y);
break;
case CONTENT_TEXTPLAIN:
browser_window_mouse_track_text(bw, mouse, x, y);
break;
default:
break;
}
}
/**
* Handle mouse tracking (including drags) in an HTML content window.
*
* \param bw browser window
* \param mouse state of mouse buttons and modifier keys
* \param x coordinate of mouse
* \param y coordinate of mouse
*/
void browser_window_mouse_track_html(struct browser_window *bw,
browser_mouse_state mouse, int x, int y)
{
switch (bw->drag_type) {
case DRAGGING_HSCROLL:
case DRAGGING_VSCROLL:
case DRAGGING_2DSCROLL: {
struct box *box = bw->scrolling_box;
int scroll_y;
int scroll_x;
assert(box);
if (bw->drag_type == DRAGGING_HSCROLL) {
scroll_y = box->scroll_y;
} else {
scroll_y = bw->drag_start_scroll_y +
(float) (y - bw->drag_start_y) /
(float) bw->drag_well_height *
(float) (box->descendant_y1 -
box->descendant_y0);
if (scroll_y < box->descendant_y0)
scroll_y = box->descendant_y0;
else if (box->descendant_y1 - box->height <
scroll_y)
scroll_y = box->descendant_y1 -
box->height;
if (scroll_y == box->scroll_y)
return;
}
if (bw->drag_type == DRAGGING_VSCROLL) {
scroll_x = box->scroll_x;
} else {
scroll_x = bw->drag_start_scroll_x +
(float) (x - bw->drag_start_x) /
(float) bw->drag_well_width *
(float) (box->descendant_x1 -
box->descendant_x0);
if (scroll_x < box->descendant_x0)
scroll_x = box->descendant_x0;
else if (box->descendant_x1 - box->width <
scroll_x)
scroll_x = box->descendant_x1 -
box->width;
}
browser_window_scroll_box(bw, box, scroll_x, scroll_y);
}
break;
case DRAGGING_SELECTION: {
struct box *box;
int dir = -1;
int dx, dy;
if (selection_dragging_start(bw->sel)) dir = 1;
box = browser_window_pick_text_box(bw, x, y, dir,
&dx, &dy);
if (box) {
int pixel_offset;
size_t idx;
nsfont.font_position_in_string(box->style,
box->text, box->length,
dx, &idx, &pixel_offset);
selection_track(bw->sel, mouse,
box->byte_offset + idx);
}
}
break;
default:
browser_window_mouse_action_html(bw, mouse, x, y);
break;
}
}
/**
* Handle mouse tracking (including drags) in a TEXTPLAIN content window.
*
* \param bw browser window
* \param mouse state of mouse buttons and modifier keys
* \param x coordinate of mouse
* \param y coordinate of mouse
*/
void browser_window_mouse_track_text(struct browser_window *bw,
browser_mouse_state mouse, int x, int y)
{
switch (bw->drag_type) {
case DRAGGING_SELECTION: {
struct content *c = bw->current_content;
int dir = -1;
size_t idx;
if (selection_dragging_start(bw->sel)) dir = 1;
idx = textplain_offset_from_coords(c, x, y, dir);
selection_track(bw->sel, mouse, idx);
}
break;
default:
browser_window_mouse_action_text(bw, mouse, x, y);
break;
}
}
/**
* Handles the end of a drag operation in a browser window.
*
* \param bw browser window
* \param mouse state of mouse buttons and modifier keys
* \param x coordinate of mouse
* \param y coordinate of mouse
*/
void browser_window_mouse_drag_end(struct browser_window *bw,
browser_mouse_state mouse, int x, int y)
{
switch (bw->drag_type) {
case DRAGGING_SELECTION: {
struct content *c = bw->current_content;
if (c) {
bool found = true;
int dir = -1;
size_t idx;
if (selection_dragging_start(bw->sel)) dir = 1;
if (c->type == CONTENT_HTML) {
int pixel_offset;
struct box *box;
int dx, dy;
box = browser_window_pick_text_box(bw,
x, y, dir, &dx, &dy);
if (box) {
nsfont.font_position_in_string(
box->style,
box->text,
box->length,
dx,
&idx,
&pixel_offset);
idx += box->byte_offset;
selection_track(bw->sel, mouse,
idx);
}
else
found = false;
}
else {
assert(c->type == CONTENT_TEXTPLAIN);
idx = textplain_offset_from_coords(c, x, y, dir);
}
if (found)
selection_track(bw->sel, mouse, idx);
}
selection_drag_end(bw->sel);
}
break;
case DRAGGING_2DSCROLL:
case DRAGGING_PAGE_SCROLL:
case DRAGGING_FRAME:
browser_window_set_pointer(bw->window, GUI_POINTER_DEFAULT);
break;
default:
break;
}
bw->drag_type = DRAGGING_NONE;
}
/**
* Handle mouse clicks in a box scrollbar.
*
* \param bw browser window
* \param mouse state of mouse buttons and modifier keys
* \param box scrolling box
* \param box_x position of box in global document coordinates
* \param box_y position of box in global document coordinates
* \param x coordinate of click relative to box position
* \param y coordinate of click relative to box position
* \return status bar message
*/
const char *browser_window_scrollbar_click(struct browser_window *bw,
browser_mouse_state mouse, struct box *box,
int box_x, int box_y, int x, int y)
{
bool but1 = ((mouse & BROWSER_MOUSE_PRESS_1) ||
((mouse & BROWSER_MOUSE_HOLDING_1) &&
(mouse & BROWSER_MOUSE_DRAG_ON)));
bool but2 = ((mouse & BROWSER_MOUSE_PRESS_2) ||
((mouse & BROWSER_MOUSE_HOLDING_2) &&
(mouse & BROWSER_MOUSE_DRAG_ON)));
const int w = SCROLLBAR_WIDTH;
bool vscroll, hscroll;
int well_height, bar_top, bar_height;
int well_width, bar_left, bar_width;
const char *status = 0;
bool vert;
int z, scroll, bar_start, bar_size, well_size, page;
box_scrollbar_dimensions(box,
box->padding[LEFT] + box->width + box->padding[RIGHT],
box->padding[TOP] + box->height + box->padding[BOTTOM],
w,
&vscroll, &hscroll,
&well_height, &bar_top, &bar_height,
&well_width, &bar_left, &bar_width);
/* store some data for scroll drags */
bw->scrolling_box = box;
bw->drag_start_x = box_x + x;
bw->drag_start_y = box_y + y;
bw->drag_start_scroll_x = box->scroll_x;
bw->drag_start_scroll_y = box->scroll_y;
bw->drag_well_width = well_width;
bw->drag_well_height = well_height;
/* determine which scrollbar was clicked */
if (box_vscrollbar_present(box) &&
box->padding[LEFT] + box->width < x) {
vert = true;
z = y;
scroll = box->scroll_y;
well_size = well_height;
bar_start = bar_top;
bar_size = bar_height;
page = box->height;
} else {
vert = false;
z = x;
scroll = box->scroll_x;
well_size = well_width;
bar_start = bar_left;
bar_size = bar_width;
page = box->width;
}
/* find icon in scrollbar and calculate scroll */
if (z < w) {
/* on scrollbar bump arrow button */
status = messages_get(vert ? "ScrollUp" : "ScrollLeft");
if (but1)
scroll -= 16;
else if (but2)
scroll += 16;
} else if (z < w + bar_start + w / 4) {
/* in scrollbar well */
status = messages_get(vert ? "ScrollPUp" : "ScrollPLeft");
if (but1)
scroll -= page;
else if (but2)
scroll += page;
} else if (z < w + bar_start + bar_size - w / 4) {
/* in scrollbar */
status = messages_get(vert ? "ScrollV" : "ScrollH");
if (mouse & (BROWSER_MOUSE_HOLDING_1 |
BROWSER_MOUSE_HOLDING_2)) {
int x0 = 0, x1 = 0;
int y0 = 0, y1 = 0;
if (mouse & BROWSER_MOUSE_HOLDING_1) {
bw->drag_type = vert ? DRAGGING_VSCROLL :
DRAGGING_HSCROLL;
} else
bw->drag_type = DRAGGING_2DSCROLL;
/* \todo - some proper numbers please! */
if (bw->drag_type != DRAGGING_VSCROLL) {
x0 = -1024;
x1 = 1024;
}
if (bw->drag_type != DRAGGING_HSCROLL) {
y0 = -1024;
y1 = 1024;
}
gui_window_box_scroll_start(bw->window, x0, y0, x1, y1);
if (bw->drag_type == DRAGGING_2DSCROLL)
gui_window_hide_pointer(bw->window);
}
} else if (z < w + well_size) {
/* in scrollbar well */
status = messages_get(vert ? "ScrollPDown" : "ScrollPRight");
if (but1)
scroll += page;
else if (but2)
scroll -= page;
} else {
/* on scrollbar bump arrow button */
status = messages_get(vert ? "ScrollDown" : "ScrollRight");
if (but1)
scroll += 16;
else if (but2)
scroll -= 16;
}
/* update box and redraw */
if (vert) {
if (scroll < box->descendant_y0)
scroll = box->descendant_y0;
else if (box->descendant_y1 - box->height < scroll)
scroll = box->descendant_y1 - box->height;
if (scroll != box->scroll_y)
browser_window_scroll_box(bw, box, box->scroll_x, scroll);
} else {
if (scroll < box->descendant_x0)
scroll = box->descendant_x0;
else if (box->descendant_x1 - box->width < scroll)
scroll = box->descendant_x1 - box->width;
if (scroll != box->scroll_x)
browser_window_scroll_box(bw, box, scroll, box->scroll_y);
}
return status;
}
/**
* Set a radio form control and clear the others in the group.
*
* \param content content containing the form, of type CONTENT_TYPE
* \param radio form control of type GADGET_RADIO
*/
void browser_radio_set(struct content *content,
struct form_control *radio)
{
struct form_control *control;
assert(content);
assert(radio);
if (!radio->form)
return;
if (radio->selected)
return;
for (control = radio->form->controls; control;
control = control->next) {
if (control->type != GADGET_RADIO)
continue;
if (control == radio)
continue;
if (strcmp(control->name, radio->name) != 0)
continue;
if (control->selected) {
control->selected = false;
browser_redraw_box(content, control->box);
}
}
radio->selected = true;
browser_redraw_box(content, radio->box);
}
/**
* Redraw a rectangular region of a browser window
*
* \param bw browser window to be redrawn
* \param x x co-ord of top-left
* \param y y co-ord of top-left
* \param width width of rectangle
* \param height height of rectangle
*/
void browser_window_redraw_rect(struct browser_window *bw, int x, int y,
int width, int height)
{
struct content *c = bw->current_content;
if (c) {
union content_msg_data data;
data.redraw.x = x;
data.redraw.y = y;
data.redraw.width = width;
data.redraw.height = height;
data.redraw.full_redraw = true;
data.redraw.object = c;
data.redraw.object_x = 0;
data.redraw.object_y = 0;
data.redraw.object_width = c->width;
data.redraw.object_height = c->height;
content_broadcast(c, CONTENT_MSG_REDRAW, data);
}
}
/**
* Redraw a box.
*
* \param c content containing the box, of type CONTENT_HTML
* \param box box to redraw
*/
void browser_redraw_box(struct content *c, struct box *box)
{
int x, y;
union content_msg_data data;
box_coords(box, &x, &y);
data.redraw.x = x;
data.redraw.y = y;
data.redraw.width = box->padding[LEFT] + box->width +
box->padding[RIGHT];
data.redraw.height = box->padding[TOP] + box->height +
box->padding[BOTTOM];
data.redraw.full_redraw = true;
data.redraw.object = c;
data.redraw.object_x = 0;
data.redraw.object_y = 0;
data.redraw.object_width = c->width;
data.redraw.object_height = c->height;
content_broadcast(c, CONTENT_MSG_REDRAW, data);
}
/**
* Update the scroll offsets of a box within a browser window
* (In future, copying where possible, rather than redrawing the entire box)
*
* \param bw browser window
* \param box box to be updated
* \param scroll_x new horizontal scroll offset
* \param scroll_y new vertical scroll offset
*/
void browser_window_scroll_box(struct browser_window *bw, struct box *box,
int scroll_x, int scroll_y)
{
box->scroll_x = scroll_x;
box->scroll_y = scroll_y;
/* fall back to redrawing the whole box */
browser_redraw_box(bw->current_content, box);
}
/**
* Process a selection from a form select menu.
*
* \param bw browser window with menu
* \param control form control with menu
* \param item index of item selected from the menu
*/
void browser_window_form_select(struct browser_window *bw,
struct form_control *control, int item)
{
struct box *inline_box;
struct form_option *o;
int count;
assert(bw);
assert(control);
inline_box = control->box->children->children;
for (count = 0, o = control->data.select.items;
o != NULL;
count++, o = o->next) {
if (!control->data.select.multiple)
o->selected = false;
if (count == item) {
if (control->data.select.multiple) {
if (o->selected) {
o->selected = false;
control->data.select.num_selected--;
} else {
o->selected = true;
control->data.select.num_selected++;
}
} else {
o->selected = true;
}
}
if (o->selected)
control->data.select.current = o;
}
talloc_free(inline_box->text);
inline_box->text = 0;
if (control->data.select.num_selected == 0)
inline_box->text = talloc_strdup(bw->current_content,
messages_get("Form_None"));
else if (control->data.select.num_selected == 1)
inline_box->text = talloc_strdup(bw->current_content,
control->data.select.current->text);
else
inline_box->text = talloc_strdup(bw->current_content,
messages_get("Form_Many"));
if (!inline_box->text) {
warn_user("NoMemory", 0);
inline_box->length = 0;
} else
inline_box->length = strlen(inline_box->text);
inline_box->width = control->box->width;
browser_redraw_box(bw->current_content, control->box);
}
gui_pointer_shape get_pointer_shape(struct box *box, bool imagemap)
{
gui_pointer_shape pointer;
struct css_style *style;
if (box->type == BOX_FLOAT_LEFT || box->type == BOX_FLOAT_RIGHT)
style = box->children->style;
else
style = box->style;
assert(style);
switch (style->cursor) {
case CSS_CURSOR_AUTO:
if (box->href || (box->gadget &&
(box->gadget->type == GADGET_IMAGE ||
box->gadget->type == GADGET_SUBMIT)) ||
imagemap)
/* link */
pointer = GUI_POINTER_POINT;
else if (box->gadget &&
(box->gadget->type == GADGET_TEXTBOX ||
box->gadget->type == GADGET_PASSWORD ||
box->gadget->type == GADGET_TEXTAREA))
/* text input */
pointer = GUI_POINTER_CARET;
else
/* anything else */
pointer = GUI_POINTER_DEFAULT;
break;
case CSS_CURSOR_CROSSHAIR:
pointer = GUI_POINTER_CROSS;
break;
case CSS_CURSOR_POINTER:
pointer = GUI_POINTER_POINT;
break;
case CSS_CURSOR_MOVE:
pointer = GUI_POINTER_MOVE;
break;
case CSS_CURSOR_E_RESIZE:
pointer = GUI_POINTER_RIGHT;
break;
case CSS_CURSOR_W_RESIZE:
pointer = GUI_POINTER_LEFT;
break;
case CSS_CURSOR_N_RESIZE:
pointer = GUI_POINTER_UP;
break;
case CSS_CURSOR_S_RESIZE:
pointer = GUI_POINTER_DOWN;
break;
case CSS_CURSOR_NE_RESIZE:
pointer = GUI_POINTER_RU;
break;
case CSS_CURSOR_SW_RESIZE:
pointer = GUI_POINTER_LD;
break;
case CSS_CURSOR_SE_RESIZE:
pointer = GUI_POINTER_RD;
break;
case CSS_CURSOR_NW_RESIZE:
pointer = GUI_POINTER_LU;
break;
case CSS_CURSOR_TEXT:
pointer = GUI_POINTER_CARET;
break;
case CSS_CURSOR_WAIT:
pointer = GUI_POINTER_WAIT;
break;
case CSS_CURSOR_PROGRESS:
pointer = GUI_POINTER_PROGRESS;
break;
case CSS_CURSOR_NO_DROP:
pointer = GUI_POINTER_NO_DROP;
break;
case CSS_CURSOR_NOT_ALLOWED:
pointer = GUI_POINTER_NOT_ALLOWED;
break;
case CSS_CURSOR_HELP:
pointer = GUI_POINTER_HELP;
break;
default:
pointer = GUI_POINTER_DEFAULT;
break;
}
return pointer;
}
/**
* Collect controls and submit a form.
*/
void browser_form_submit(struct browser_window *bw, struct browser_window *target,
struct form *form, struct form_control *submit_button)
{
char *data = 0, *url = 0;
struct form_successful_control *success;
assert(form);
assert(bw->current_content->type == CONTENT_HTML);
if (!form_successful_controls(form, submit_button, &success)) {
warn_user("NoMemory", 0);
return;
}
switch (form->method) {
case method_GET:
data = form_url_encode(form, success);
if (!data) {
form_free_successful(success);
warn_user("NoMemory", 0);
return;
}
url = calloc(1, strlen(form->action) +
strlen(data) + 2);
if (!url) {
form_free_successful(success);
free(data);
warn_user("NoMemory", 0);
return;
}
if (form->action[strlen(form->action)-1] == '?') {
sprintf(url, "%s%s", form->action, data);
}
else {
sprintf(url, "%s?%s", form->action, data);
}
browser_window_go(target, url,
bw->current_content->url, true);
break;
case method_POST_URLENC:
data = form_url_encode(form, success);
if (!data) {
form_free_successful(success);
warn_user("NoMemory", 0);
return;
}
browser_window_go_post(target, form->action, data, 0,
true, bw->current_content->url,
false, true, 0);
break;
case method_POST_MULTIPART:
browser_window_go_post(target, form->action, 0,
success, true,
bw->current_content->url,
false, true, 0);
break;
default:
assert(0);
}
form_free_successful(success);
free(data);
free(url);
}
/**
* Check whether box is nearer mouse coordinates than current nearest box
*
* \param box box to test
* \param bx position of box, in global document coordinates
* \param by position of box, in global document coordinates
* \param x mouse point, in global document coordinates
* \param y mouse point, in global document coordinates
* \param dir direction in which to search (-1 = above-left,
* +1 = below-right)
* \param nearest nearest text box found, or NULL if none
* updated if box is nearer than existing nearest
* \param tx position of text_box, in global document coordinates
* updated if box is nearer than existing nearest
* \param ty position of text_box, in global document coordinates
* updated if box is nearer than existing nearest
* \param nr_xd distance to nearest text box found
* updated if box is nearer than existing nearest
* \param ny_yd distance to nearest text box found
* updated if box is nearer than existing nearest
* \return true if mouse point is inside box
*/
bool browser_window_nearer_text_box(struct box *box, int bx, int by,
int x, int y, int dir, struct box **nearest, int *tx, int *ty,
int *nr_xd, int *nr_yd)
{
int w = box->padding[LEFT] + box->width + box->padding[RIGHT];
int h = box->padding[TOP] + box->height + box->padding[BOTTOM];
int y1 = by + h;
int x1 = bx + w;
int yd = INT_MAX;
int xd = INT_MAX;
if (x >= bx && x1 > x && y >= by && y1 > y) {
*nearest = box;
*tx = bx;
*ty = by;
return true;
}
if (box->parent->list_marker != box) {
if (dir < 0) {
/* consider only those children (partly) above-left */
if (by <= y && bx < x) {
yd = y <= y1 ? 0 : y - y1;
xd = x <= x1 ? 0 : x - x1;
}
} else {
/* consider only those children (partly) below-right */
if (y1 > y && x1 > x) {
yd = y > by ? 0 : by - y;
xd = x > bx ? 0 : bx - x;
}
}
/* give y displacement precedence over x */
if (yd < *nr_yd || (yd == *nr_yd && xd <= *nr_xd)) {
*nr_yd = yd;
*nr_xd = xd;
*nearest = box;
*tx = bx;
*ty = by;
}
}
return false;
}
/**
* Pick the text box child of 'box' that is closest to and above-left
* (dir -ve) or below-right (dir +ve) of the point 'x,y'
*
* \param box parent box
* \param bx position of box, in global document coordinates
* \param by position of box, in global document coordinates
* \param fx position of float parent, in global document coordinates
* \param fy position of float parent, in global document coordinates
* \param x mouse point, in global document coordinates
* \param y mouse point, in global document coordinates
* \param dir direction in which to search (-1 = above-left,
* +1 = below-right)
* \param nearest nearest text box found, or NULL if none
* updated if a descendant of box is nearer than old nearest
* \param tx position of nearest, in global document coordinates
* updated if a descendant of box is nearer than old nearest
* \param ty position of nearest, in global document coordinates
* updated if a descendant of box is nearer than old nearest
* \param nr_xd distance to nearest text box found
* updated if a descendant of box is nearer than old nearest
* \param ny_yd distance to nearest text box found
* updated if a descendant of box is nearer than old nearest
* \return true if mouse point is inside text_box
*/
bool browser_window_nearest_text_box(struct box *box, int bx, int by,
int fx, int fy, int x, int y, int dir, struct box **nearest,
int *tx, int *ty, int *nr_xd, int *nr_yd)
{
struct box *child = box->children;
int c_bx, c_by;
int c_fx, c_fy;
bool in_box = false;
if (*nearest == NULL) {
*nr_xd = INT_MAX / 2; /* displacement of 'nearest so far' */
*nr_yd = INT_MAX / 2;
}
if (box->type == BOX_INLINE_CONTAINER) {
int bw = box->padding[LEFT] + box->width + box->padding[RIGHT];
int bh = box->padding[TOP] + box->height + box->padding[BOTTOM];
int b_y1 = by + bh;
int b_x1 = bx + bw;
if (x >= bx && b_x1 > x && y >= by && b_y1 > y) {
in_box = true;
}
}
while (child) {
if (child->type == BOX_FLOAT_LEFT ||
child->type == BOX_FLOAT_RIGHT) {
c_bx = fx + child->x - child->scroll_x;
c_by = fy + child->y - child->scroll_y;
} else {
c_bx = bx + child->x - child->scroll_x;
c_by = by + child->y - child->scroll_y;
}
if (child->float_children) {
c_fx = c_bx;
c_fy = c_by;
} else {
c_fx = fx;
c_fy = fy;
}
if (in_box && child->text && !child->object) {
if (browser_window_nearer_text_box(child,
c_bx, c_by, x, y, dir, nearest,
tx, ty, nr_xd, nr_yd))
return true;
} else {
if (child->list_marker) {
if (browser_window_nearer_text_box(
child->list_marker,
c_bx + child->list_marker->x,
c_by + child->list_marker->y,
x, y, dir, nearest,
tx, ty, nr_xd, nr_yd))
return true;
}
if (browser_window_nearest_text_box(child, c_bx, c_by,
c_fx, c_fy, x, y, dir, nearest, tx, ty,
nr_xd, nr_yd))
return true;
}
child = child->next;
}
return false;
}
/**
* Peform pick text on browser window contents to locate the box under
* the mouse pointer, or nearest in the given direction if the pointer is
* not over a text box.
*
* \param bw browser window
* \param x coordinate of mouse
* \param y coordinate of mouse
* \param dir direction to search (-1 = above-left, +1 = below-right)
* \param dx receives x ordinate of mouse relative to text box
* \param dy receives y ordinate of mouse relative to text box
*/
struct box *browser_window_pick_text_box(struct browser_window *bw,
int x, int y, int dir, int *dx, int *dy)
{
struct content *c = bw->current_content;
struct box *text_box = NULL;
if (c && c->type == CONTENT_HTML) {
struct box *box = c->data.html.layout;
int nr_xd, nr_yd;
int bx = box->margin[LEFT];
int by = box->margin[TOP];
int fx = bx;
int fy = by;
int tx, ty;
if (!browser_window_nearest_text_box(box, bx, by, fx, fy, x, y,
dir, &text_box, &tx, &ty, &nr_xd, &nr_yd)) {
if (text_box && text_box->text && !text_box->object) {
int w = (text_box->padding[LEFT] +
text_box->width +
text_box->padding[RIGHT]);
int h = (text_box->padding[TOP] +
text_box->height +
text_box->padding[BOTTOM]);
int x1, y1;
y1 = ty + h;
x1 = tx + w;
/* ensure point lies within the text box */
if (x < tx) x = tx;
if (y < ty) y = ty;
if (y > y1) y = y1;
if (x > x1) x = x1;
}
}
/* return coordinates relative to box */
*dx = x - tx;
*dy = y - ty;
}
return text_box;
}
/**
* Start drag scrolling the contents of the browser window
*
* \param bw browser window
* \param x x ordinate of initial mouse position
* \param y y ordinate
*/
void browser_window_page_drag_start(struct browser_window *bw, int x, int y)
{
bw->drag_type = DRAGGING_PAGE_SCROLL;
bw->drag_start_x = x;
bw->drag_start_y = y;
gui_window_get_scroll(bw->window, &bw->drag_start_scroll_x, &bw->drag_start_scroll_y);
gui_window_scroll_start(bw->window);
}
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