mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-23 20:46:50 +03:00
93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
|
/*
|
||
|
|
* Copyright 2019 Daniel Silverstone <dsilvers@netsurf-browser.org>
|
||
|
|
* Copyright 2019 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
|
||
|
|
*
|
||
|
|
* Helpers to simplify core use of corewindow.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "utils/errors.h"
|
||
|
|
#include "netsurf/browser.h"
|
||
|
|
#include "netsurf/core_window.h"
|
||
|
|
#include "netsurf/types.h"
|
||
|
|
#include "css/utils.h"
|
||
|
|
#include "desktop/cw_helper.h"
|
||
|
|
|
||
|
|
/* exported interface documented in cw_helper.h */
|
||
|
|
nserror cw_helper_scroll_visible(
|
||
|
|
const struct core_window_callback_table *cw_t,
|
||
|
|
struct core_window *cw_h,
|
||
|
|
const struct rect *r)
|
||
|
|
{
|
||
|
|
nserror err;
|
||
|
|
int height;
|
||
|
|
int width;
|
||
|
|
int x0;
|
||
|
|
int y0;
|
||
|
|
int x1;
|
||
|
|
int y1;
|
||
|
|
|
||
|
|
assert(cw_t != NULL);
|
||
|
|
assert(cw_h != NULL);
|
||
|
|
assert(cw_t->get_scroll != NULL);
|
||
|
|
assert(cw_t->set_scroll != NULL);
|
||
|
|
assert(cw_t->get_window_dimensions != NULL);
|
||
|
|
|
||
|
|
err = cw_t->get_window_dimensions(cw_h, &width, &height);
|
||
|
|
if (err != NSERROR_OK) {
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
cw_t->get_scroll(cw_h, &x0, &y0);
|
||
|
|
if (err != NSERROR_OK) {
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
y1 = y0 + height;
|
||
|
|
x1 = x0 + width;
|
||
|
|
|
||
|
|
if (r->y1 > y1) {
|
||
|
|
/* The bottom of the rectangle is off the bottom of the
|
||
|
|
* window, so scroll down to fit it
|
||
|
|
*/
|
||
|
|
y0 = r->y1 - height;
|
||
|
|
}
|
||
|
|
if (r->y0 < y0) {
|
||
|
|
/* The top of the rectangle is off the top of the window,
|
||
|
|
* so scroll up to fit it
|
||
|
|
*/
|
||
|
|
y0 = r->y0;
|
||
|
|
}
|
||
|
|
if (r->x1 > x1) {
|
||
|
|
/* The right of the rectangle is off the right of the window
|
||
|
|
* so scroll right to fit it
|
||
|
|
*/
|
||
|
|
x0 = r->x1 - width;
|
||
|
|
}
|
||
|
|
if (r->x0 < x0) {
|
||
|
|
/* The left of the rectangle is off the left of the window
|
||
|
|
* so scroll left to fit it
|
||
|
|
*/
|
||
|
|
x0 = r->x0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return cw_t->set_scroll(cw_h, x0, y0);
|
||
|
|
}
|