1 /****************************************************************************
2  * Copyright 2020 Thomas E. Dickey                                          *
3  * Copyright 1998-2010,2016 Free Software Foundation, Inc.                  *
4  *                                                                          *
5  * Permission is hereby granted, free of charge, to any person obtaining a  *
6  * copy of this software and associated documentation files (the            *
7  * "Software"), to deal in the Software without restriction, including      *
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10  * copies of the Software, and to permit persons to whom the Software is    *
11  * furnished to do so, subject to the following conditions:                 *
12  *                                                                          *
13  * The above copyright notice and this permission notice shall be included  *
14  * in all copies or substantial portions of the Software.                   *
15  *                                                                          *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
19  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
22  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
23  *                                                                          *
24  * Except as contained in this notice, the name(s) of the above copyright   *
25  * holders shall not be used in advertising or otherwise to promote the     *
26  * sale, use or other dealings in this Software without prior written       *
27  * authorization.                                                           *
28  ****************************************************************************/
29 
30 /****************************************************************************
31  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
32  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
33  ****************************************************************************/
34 
35 /*
36 **	lib_window.c
37 **
38 **
39 */
40 
41 #include <curses.priv.h>
42 
43 MODULE_ID("$Id: lib_window.c,v 1.31 2020/02/02 23:34:34 tom Exp $")
44 
NCURSES_EXPORT(void)45 NCURSES_EXPORT(void)
46 _nc_synchook(WINDOW *win)
47 /* hook to be called after each window change */
48 {
49     if (win->_immed)
50 	wrefresh(win);
51     if (win->_sync)
52 	wsyncup(win);
53 }
54 
55 NCURSES_EXPORT(int)
mvderwin(WINDOW * win,int y,int x)56 mvderwin(WINDOW *win, int y, int x)
57 /* move a derived window */
58 {
59     WINDOW *orig;
60     int rc = ERR;
61 
62     T((T_CALLED("mvderwin(%p,%d,%d)"), (void *) win, y, x));
63 
64     if (win != 0
65 	&& (orig = win->_parent) != 0
66 	&& (x >= 0 && y >= 0)
67 	&& (x + getmaxx(win) <= getmaxx(orig))
68 	&& (y + getmaxy(win) <= getmaxy(orig))) {
69 	int i;
70 
71 	wsyncup(win);
72 	win->_parx = x;
73 	win->_pary = y;
74 	for (i = 0; i < getmaxy(win); i++)
75 	    win->_line[i].text = &(orig->_line[y++].text[x]);
76 	rc = OK;
77     }
78     returnCode(rc);
79 }
80 
81 NCURSES_EXPORT(int)
syncok(WINDOW * win,bool bf)82 syncok(WINDOW *win, bool bf)
83 /* enable/disable automatic wsyncup() on each change to window */
84 {
85     T((T_CALLED("syncok(%p,%d)"), (void *) win, bf));
86 
87     if (win) {
88 	win->_sync = bf;
89 	returnCode(OK);
90     } else
91 	returnCode(ERR);
92 }
93 
94 NCURSES_EXPORT(void)
wsyncup(WINDOW * win)95 wsyncup(WINDOW *win)
96 /* mark changed every cell in win's ancestors that is changed in win */
97 /* Rewritten by J. Pfeifer, 1-Apr-96 (don't even think that...)      */
98 {
99     WINDOW *wp;
100 
101     T((T_CALLED("wsyncup(%p)"), (void *) win));
102     if (win && win->_parent) {
103 	for (wp = win; wp->_parent; wp = wp->_parent) {
104 	    int y;
105 	    WINDOW *pp = wp->_parent;
106 
107 	    assert((wp->_pary <= pp->_maxy) &&
108 		   ((wp->_pary + wp->_maxy) <= pp->_maxy));
109 
110 	    for (y = 0; y <= wp->_maxy; y++) {
111 		int left = wp->_line[y].firstchar;
112 		if (left >= 0) {	/* line is touched */
113 		    struct ldat *line = &(pp->_line[wp->_pary + y]);
114 		    /* left & right character in parent window coordinates */
115 		    int right = wp->_line[y].lastchar + wp->_parx;
116 		    left += wp->_parx;
117 
118 		    CHANGED_RANGE(line, left, right);
119 		}
120 	    }
121 	}
122     }
123     returnVoid;
124 }
125 
126 NCURSES_EXPORT(void)
wsyncdown(WINDOW * win)127 wsyncdown(WINDOW *win)
128 /* mark changed every cell in win that is changed in any of its ancestors */
129 /* Rewritten by J. Pfeifer, 1-Apr-96 (don't even think that...)           */
130 {
131     T((T_CALLED("wsyncdown(%p)"), (void *) win));
132 
133     if (win && win->_parent) {
134 	WINDOW *pp = win->_parent;
135 	int y;
136 
137 	/* This recursion guarantees, that the changes are propagated down-
138 	   wards from the root to our direct parent. */
139 	wsyncdown(pp);
140 
141 	/* and now we only have to propagate the changes from our direct
142 	   parent, if there are any. */
143 	assert((win->_pary <= pp->_maxy) &&
144 	       ((win->_pary + win->_maxy) <= pp->_maxy));
145 
146 	for (y = 0; y <= win->_maxy; y++) {
147 	    if (pp->_line[win->_pary + y].firstchar >= 0) {	/* parent changed */
148 		struct ldat *line = &(win->_line[y]);
149 		/* left and right character in child coordinates */
150 		int left = pp->_line[win->_pary + y].firstchar - win->_parx;
151 		int right = pp->_line[win->_pary + y].lastchar - win->_parx;
152 		/* The change may be outside the child's range */
153 		if (left < 0)
154 		    left = 0;
155 		if (right > win->_maxx)
156 		    right = win->_maxx;
157 		CHANGED_RANGE(line, left, right);
158 	    }
159 	}
160     }
161     returnVoid;
162 }
163 
164 NCURSES_EXPORT(void)
wcursyncup(WINDOW * win)165 wcursyncup(WINDOW *win)
166 /* sync the cursor in all derived windows to its value in the base window */
167 {
168     WINDOW *wp;
169 
170     T((T_CALLED("wcursyncup(%p)"), (void *) win));
171     for (wp = win; wp && wp->_parent; wp = wp->_parent) {
172 	wmove(wp->_parent, wp->_pary + wp->_cury, wp->_parx + wp->_curx);
173     }
174     returnVoid;
175 }
176 
177 NCURSES_EXPORT(WINDOW *)
dupwin(WINDOW * win)178 dupwin(WINDOW *win)
179 /* make an exact duplicate of the given window */
180 {
181     WINDOW *nwin = 0;
182 
183     T((T_CALLED("dupwin(%p)"), (void *) win));
184 
185     if (win != 0) {
186 #if NCURSES_SP_FUNCS
187 	SCREEN *sp = _nc_screen_of(win);
188 #endif
189 	_nc_lock_global(curses);
190 	if (win->_flags & _ISPAD) {
191 	    nwin = NCURSES_SP_NAME(newpad) (NCURSES_SP_ARGx
192 					    win->_maxy + 1,
193 					    win->_maxx + 1);
194 	} else {
195 	    nwin = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx
196 					    win->_maxy + 1,
197 					    win->_maxx + 1,
198 					    win->_begy,
199 					    win->_begx);
200 	}
201 
202 	if (nwin != 0) {
203 	    int i;
204 	    size_t linesize;
205 
206 	    nwin->_curx = win->_curx;
207 	    nwin->_cury = win->_cury;
208 	    nwin->_maxy = win->_maxy;
209 	    nwin->_maxx = win->_maxx;
210 	    nwin->_begy = win->_begy;
211 	    nwin->_begx = win->_begx;
212 	    nwin->_yoffset = win->_yoffset;
213 
214 	    nwin->_flags = win->_flags & ~_SUBWIN;
215 	    /* Due to the use of newwin(), the clone is not a subwindow.
216 	     * The text is really copied into the clone.
217 	     */
218 
219 	    WINDOW_ATTRS(nwin) = WINDOW_ATTRS(win);
220 	    nwin->_nc_bkgd = win->_nc_bkgd;
221 
222 	    nwin->_notimeout = win->_notimeout;
223 	    nwin->_clear = win->_clear;
224 	    nwin->_leaveok = win->_leaveok;
225 	    nwin->_scroll = win->_scroll;
226 	    nwin->_idlok = win->_idlok;
227 	    nwin->_idcok = win->_idcok;
228 	    nwin->_immed = win->_immed;
229 	    nwin->_sync = win->_sync;
230 	    nwin->_use_keypad = win->_use_keypad;
231 	    nwin->_delay = win->_delay;
232 
233 	    nwin->_parx = 0;
234 	    nwin->_pary = 0;
235 	    nwin->_parent = (WINDOW *) 0;
236 	    /* See above: the clone isn't a subwindow! */
237 
238 	    nwin->_regtop = win->_regtop;
239 	    nwin->_regbottom = win->_regbottom;
240 
241 	    if (win->_flags & _ISPAD)
242 		nwin->_pad = win->_pad;
243 
244 	    linesize = (unsigned) (win->_maxx + 1) * sizeof(NCURSES_CH_T);
245 	    for (i = 0; i <= nwin->_maxy; i++) {
246 		memcpy(nwin->_line[i].text, win->_line[i].text, linesize);
247 		nwin->_line[i].firstchar = win->_line[i].firstchar;
248 		nwin->_line[i].lastchar = win->_line[i].lastchar;
249 	    }
250 	}
251 	_nc_unlock_global(curses);
252     }
253     returnWin(nwin);
254 }
255