mirror of
https://github.com/tmux/tmux.git
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291 lines
6.4 KiB
C
291 lines
6.4 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include <vis.h>
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#include "tmux.h"
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void screen_resize_x(struct screen *, u_int);
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void screen_resize_y(struct screen *, u_int);
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/* Create a new screen. */
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void
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screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
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{
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s->grid = grid_create(sx, sy, hlimit);
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s->title = xstrdup("");
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s->tabs = NULL;
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screen_reinit(s);
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}
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/* Reinitialise screen. */
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void
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screen_reinit(struct screen *s)
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{
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s->cx = 0;
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s->cy = 0;
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s->rupper = 0;
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s->rlower = screen_size_y(s) - 1;
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s->mode = MODE_CURSOR;
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screen_reset_tabs(s);
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grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy - 1);
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screen_clear_selection(s);
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}
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/* Destroy a screen. */
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void
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screen_free(struct screen *s)
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{
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xfree(s->title);
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grid_destroy(s->grid);
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}
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/* Reset tabs to default, eight spaces apart. */
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void
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screen_reset_tabs(struct screen *s)
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{
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u_int i;
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if (s->tabs != NULL)
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xfree(s->tabs);
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if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL)
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fatal("bit_alloc failed");
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for (i = 8; i < screen_size_x(s); i += 8)
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bit_set(s->tabs, i);
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}
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/* Set screen title. */
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void
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screen_set_title(struct screen *s, const char *title)
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{
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char tmp[BUFSIZ];
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strnvis(tmp, title, sizeof tmp, VIS_OCTAL|VIS_TAB|VIS_NL);
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xfree(s->title);
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s->title = xstrdup(tmp);
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}
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/* Resize screen. */
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void
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screen_resize(struct screen *s, u_int sx, u_int sy)
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{
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if (sx < 1)
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sx = 1;
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if (sy < 1)
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sy = 1;
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if (sx != screen_size_x(s)) {
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screen_resize_x(s, sx);
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/*
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* It is unclear what should happen to tabs on resize. xterm
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* seems to try and maintain them, rxvt resets them. Resetting
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* is simpler and more reliable so let's do that.
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*/
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screen_reset_tabs(s);
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}
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if (sy != screen_size_y(s))
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screen_resize_y(s, sy);
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}
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void
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screen_resize_x(struct screen *s, u_int sx)
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{
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struct grid *gd = s->grid;
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const struct grid_cell *gc;
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const struct grid_utf8 *gu;
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u_int xx, yy;
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if (sx == 0)
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fatalx("zero size");
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/* If getting larger, not much to do. */
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if (sx > screen_size_x(s)) {
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gd->sx = sx;
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return;
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}
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/* If getting smaller, nuke any data in lines over the new size. */
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for (yy = gd->hsize; yy < gd->hsize + screen_size_y(s); yy++) {
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/*
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* If the character after the last is wide or padding, remove
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* it and any leading padding.
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*/
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gc = &grid_default_cell;
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for (xx = sx; xx > 0; xx--) {
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gc = grid_peek_cell(gd, xx - 1, yy);
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if (!(gc->flags & GRID_FLAG_PADDING))
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break;
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grid_set_cell(gd, xx - 1, yy, &grid_default_cell);
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}
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if (xx > 0 && xx != sx && gc->flags & GRID_FLAG_UTF8) {
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gu = grid_peek_utf8(gd, xx - 1, yy);
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if (gu->width > 1) {
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grid_set_cell(
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gd, xx - 1, yy, &grid_default_cell);
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}
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}
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/* Reduce the line size. */
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grid_reduce_line(gd, yy, sx);
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}
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if (s->cx >= sx)
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s->cx = sx - 1;
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gd->sx = sx;
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}
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void
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screen_resize_y(struct screen *s, u_int sy)
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{
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struct grid *gd = s->grid;
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u_int needed, available, oldy, i;
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if (sy == 0)
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fatalx("zero size");
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oldy = screen_size_y(s);
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/*
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* When resizing:
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*
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* If the height is decreasing, delete lines from the bottom until
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* hitting the cursor, then push lines from the top into the history.
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*
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* When increasing, pull as many lines as possible from the history to
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* the top, then fill the remaining with blanks at the bottom.
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*/
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/* Size decreasing. */
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if (sy < oldy) {
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needed = oldy - sy;
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/* Delete as many lines as possible from the bottom. */
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available = oldy - 1 - s->cy;
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if (available > 0) {
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if (available > needed)
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available = needed;
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grid_view_delete_lines(gd, oldy - available, available);
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}
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needed -= available;
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/*
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* Now just increase the history size to take over the lines
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* which are left. XXX Should apply history limit?
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*/
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gd->hsize += needed;
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s->cy -= needed;
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}
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/* Resize line arrays. */
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gd->size = xrealloc(gd->size, gd->hsize + sy, sizeof *gd->size);
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gd->data = xrealloc(gd->data, gd->hsize + sy, sizeof *gd->data);
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gd->usize = xrealloc(gd->usize, gd->hsize + sy, sizeof *gd->usize);
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gd->udata = xrealloc(gd->udata, gd->hsize + sy, sizeof *gd->udata);
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/* Size increasing. */
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if (sy > oldy) {
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needed = sy - oldy;
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/* Try to pull as much as possible out of the history. */
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available = gd->hsize;
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if (available > 0) {
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if (available > needed)
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available = needed;
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gd->hsize -= available;
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s->cy += available;
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}
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needed -= available;
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/* Then fill the rest in with blanks. */
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for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++) {
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gd->size[i] = 0;
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gd->data[i] = NULL;
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gd->usize[i] = 0;
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gd->udata[i] = NULL;
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}
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}
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/* Set the new size, and reset the scroll region. */
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gd->sy = sy;
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s->rupper = 0;
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s->rlower = screen_size_y(s) - 1;
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}
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/* Set selection. */
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void
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screen_set_selection(struct screen *s,
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u_int sx, u_int sy, u_int ex, u_int ey, struct grid_cell *gc)
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{
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struct screen_sel *sel = &s->sel;
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memcpy(&sel->cell, gc, sizeof sel->cell);
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sel->flag = 1;
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if (ey < sy || (sy == ey && ex < sx)) {
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sel->sx = ex; sel->sy = ey;
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sel->ex = sx; sel->ey = sy;
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} else {
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sel->sx = sx; sel->sy = sy;
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sel->ex = ex; sel->ey = ey;
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}
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}
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/* Clear selection. */
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void
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screen_clear_selection(struct screen *s)
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{
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struct screen_sel *sel = &s->sel;
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sel->flag = 0;
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}
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/* Check if cell in selection. */
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int
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screen_check_selection(struct screen *s, u_int px, u_int py)
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{
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struct screen_sel *sel = &s->sel;
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if (!sel->flag || py < sel->sy || py > sel->ey)
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return (0);
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if (py == sel->sy && py == sel->ey) {
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if (px < sel->sx || px > sel->ex)
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return (0);
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return (1);
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}
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if ((py == sel->sy && px < sel->sx) || (py == sel->ey && px > sel->ex))
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return (0);
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return (1);
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}
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