4 #include <stdint.h> /* for uint16_t, uint32_t */
5 #include <ncurses.h> /* for LOTS of stuff */
6 #include <stdlib.h> /* for malloc(), free() */
7 #include <string.h> /* for strlen(), memcpy() */
8 #include "yx_uint16.h" /* for yx_uint16 coordinates */
12 /* Fit virtual screen's width to minimum width demanded by current windows'
15 static void refit_pad(struct WinMeta * wmeta);
19 /* Update geometry (sizes, positions) of window "w" and its successors in the
20 * window chain. For the positioning algorithm place_win() is used.
22 static void update_wins(struct WinMeta * wmeta, struct Win * w);
23 static void place_win(struct WinMeta * wmeta, struct Win * w);
27 /* Destroy window "w"'s ncurses window (and set w.Frame.curses_win to 0). */
28 static void destroy_win(struct Win * w);
32 /* Draw contents of all windows in window chain from window "w" onwards. */
33 static void draw_wins(struct Win * w);
37 /* draw_win_borderlines() draws the vertical and horizontal borders of window
38 * "w" sans corners, and draws the top border line as the windows' title bar
39 * (highlighted if the window is described active by "active" being set).
40 * draw_wins_borderlines().
42 * draw_wins_borderlines() calls draw_win_borderlines() recursively on all
43 * windows from "w" on. "w_active" is a pointer to the one window that
44 * draw_win_borderlines() is supposed to handle as the active window.
46 * Finally, draw_wins_bordercorners draws into "pad" the borders of window "w"
47 * and all its successors.
49 static void draw_win_borderlines(struct Win * w, char active);
50 static void draw_wins_borderlines(struct Win * w, struct Win * w_active);
51 static void draw_wins_bordercorners(struct Win * w, WINDOW * pad);
55 static void refit_pad(struct WinMeta * wmeta)
57 /* Determine rightmost window column. */
58 uint16_t lastwincol = 0;
59 struct Win * w_p = wmeta->chain_start;
62 if (w_p->start.x + w_p->frame.size.x > lastwincol + 1)
64 lastwincol = w_p->start.x + w_p->frame.size.x - 1;
69 /* Only resize the pad if the rightmost window column has changed. */
70 if (getmaxx(wmeta->pad.curses_win) != lastwincol)
72 wresize(wmeta->pad.curses_win,
73 getmaxy(wmeta->pad.curses_win), lastwincol + 2);
79 static void update_wins (struct WinMeta * wmeta, struct Win * w)
81 if (0 != w->frame.curses_win)
87 w->frame.curses_win = subpad(wmeta->pad.curses_win,
88 w->frame.size.y, w->frame.size.x,
89 w->start.y, w->start.x);
92 update_wins (wmeta, w->next);
98 static void place_win (struct WinMeta * wmeta, struct Win * w)
100 /* First window goes into the upper-left corner. */
102 w->start.y = 1; /* Leave space for title bar. */
106 /* Non-first window fallbacks to: fit rightwards of rightmost border. */
107 struct Win * w_top = w->prev;
108 while (w_top->start.y != 1)
112 w->start.x = w_top->start.x + w_top->frame.size.x + 1;
114 /* Fit window below its predecessor if that one directly thrones over
115 * empty space wide and high enough.
117 uint16_t w_prev_maxy = w->prev->start.y
118 + getmaxy(w->prev->frame.curses_win);
119 if ( w->frame.size.x <= w->prev->frame.size.x
120 && w->frame.size.y < wmeta->pad.size.y - w_prev_maxy)
122 w->start.x = w->prev->start.x;
123 w->start.y = w_prev_maxy + 1;
126 /* Failing that, try to open a new sub column below the nearest
127 * predecessor window that thrones over enough empty space.
131 struct Win * w_up = w->prev;
132 struct Win * w_upup = w_up;
134 while (w_up != w_top)
139 if (w_up->start.y != w_upup->start.y)
143 w_upup = w_upup->prev;
145 w_prev_maxy = w_upup->start.y
146 + getmaxy(w_upup->frame.curses_win);
147 widthdiff = (w_upup->start.x + w_upup->frame.size.x)
148 - (w_up->start.x + w_up->frame.size.x);
149 if ( w->frame.size.y < wmeta->pad.size.y - w_prev_maxy
150 && w->frame.size.x < widthdiff)
152 w->start.x = w_up->start.x + w_up->frame.size.x + 1 ;
153 w->start.y = w_prev_maxy + 1;
164 static void destroy_win (struct Win * w)
166 delwin(w->frame.curses_win);
167 w->frame.curses_win = 0;
172 static void draw_wins (struct Win * w)
183 static void draw_win_borderlines(struct Win * w, char active)
185 /* Draw vertical and horizontal border lines. */
187 for (y = w->start.y; y <= w->start.y + w->frame.size.y; y++)
189 mvwaddch(wgetparent(w->frame.curses_win), y, w->start.x - 1, '|');
190 mvwaddch(wgetparent(w->frame.curses_win),
191 y, w->start.x + w->frame.size.x, '|');
193 for (x = w->start.x; x <= w->start.x + w->frame.size.x; x++)
195 mvwaddch(wgetparent(w->frame.curses_win), w->start.y - 1, x, '-');
196 mvwaddch(wgetparent(w->frame.curses_win),
197 w->start.y + w->frame.size.y, x, '-');
200 /* Draw as much as possible of the title into center of top border line. */
201 char min_title_length_visible = 3; /* min. 1 char + 2 padding/decoration */
202 if (w->frame.size.x >= min_title_length_visible)
204 uint16_t title_offset = 0;
205 if (w->frame.size.x > strlen(w->title) + 2)
207 title_offset = (w->frame.size.x - (strlen(w->title) + 2)) / 2;
208 } /* +2 is for padding/decoration */
209 uint16_t length_visible = strnlen(w->title, w->frame.size.x - 2);
210 char title[length_visible + 3];
211 char decoration = ' ';
216 memcpy(title + 1, w->title, length_visible);
217 title[0] = title[length_visible + 1] = decoration;
218 title[length_visible + 2] = '\0';
219 mvwaddstr(wgetparent(w->frame.curses_win),
220 w->start.y - 1, w->start.x + title_offset, title);
226 static void draw_wins_borderlines(struct Win * w, struct Win * w_active)
233 draw_win_borderlines(w, active);
236 draw_wins_borderlines (w->next, w_active);
242 static void draw_wins_bordercorners(struct Win * w, WINDOW * pad)
244 mvwaddch(pad, w->start.y - 1, w->start.x - 1, '+');
245 mvwaddch(pad, w->start.y - 1, w->start.x + w->frame.size.x, '+');
246 mvwaddch(pad, w->start.y + w->frame.size.y, w->start.x - 1, '+');
248 w->start.y + w->frame.size.y, w->start.x + w->frame.size.x, '+');
251 draw_wins_bordercorners(w->next, pad);
257 extern struct WinMeta init_win_meta(WINDOW * screen)
259 struct WinMeta wmeta;
260 wmeta.screen = screen;
261 wmeta.pad.size.y = getmaxy(screen);
262 wmeta.pad.size.x = getmaxx(screen);
263 wmeta.chain_start = 0;
265 wmeta.pad_offset = 0;
266 wmeta.pad.curses_win = newpad(wmeta.pad.size.y, 1);
273 extern struct Win init_win(struct WinMeta * wmeta, char * title,
274 void * data, void * func)
279 w.frame.curses_win = 0;
282 w.frame.size.y = wmeta->pad.size.y - 1;
290 extern void append_win(struct WinMeta * wmeta, struct Win * w)
292 if (0 != wmeta->chain_start)
294 w->prev = wmeta->chain_end;
295 wmeta->chain_end->next = w;
300 wmeta->chain_start = w;
302 wmeta->chain_end = w;
303 update_wins(wmeta, w);
308 extern void suspend_win(struct WinMeta * wmeta, struct Win * w)
312 if (wmeta->chain_start != w)
314 w->prev->next = w->next;
318 wmeta->chain_start = w->next;
320 char pad_refitted = 0;
321 if (wmeta->chain_end != w)
323 w->next->prev = w->prev;
324 if (wmeta->active == w)
326 wmeta->active = w->next;
328 update_wins(wmeta, w->next); /* Positioning of successor windows may */
329 pad_refitted = 1; /* be affected / need correction. Note */
330 } /* that update_wins() already refits the */
331 else /* pad, voiding later need for that. */
333 wmeta->chain_end = w->prev;
334 if (wmeta->active == w)
336 wmeta->active = w->prev;
343 if (0 == pad_refitted)
351 extern void reset_pad_offset(struct WinMeta * wmeta, uint16_t new_offset)
354 && (new_offset < wmeta->pad_offset
355 || new_offset + wmeta->pad.size.x < getmaxx(wmeta->pad.curses_win)))
357 wmeta->pad_offset = new_offset;
363 extern void resize_active_win(struct WinMeta * wmeta, struct yx_uint16 size)
365 if (0 != wmeta->active
366 && size.x > 0 && size.y > 0
367 && size.y < wmeta->pad.size.y)
369 wmeta->active->frame.size = size;
370 update_wins(wmeta, wmeta->chain_start); /* Positioning of successor */
371 } /* windows may be affected. */
376 extern void cycle_active_win(struct WinMeta * wmeta, char dir)
378 if (0 != wmeta->active)
382 if (wmeta->active->next != 0)
384 wmeta->active = wmeta->active->next;
388 wmeta->active = wmeta->chain_start;
393 if (wmeta->active->prev != 0)
395 wmeta->active = wmeta->active->prev;
399 wmeta->active = wmeta->chain_end;
407 extern void shift_active_win(struct WinMeta * wmeta, char dir)
409 if (0 != wmeta->active /* No shifting with less */
410 && wmeta->chain_start != wmeta->chain_end /* than one window visible. */
411 && (dir == 'f' || dir == 'b'))
413 struct Win * w_shift = wmeta->active, * w_p, * w_p_next;
415 /* Check if shifting will lead to wrapping. */
417 if ( (dir == 'f' && w_shift == wmeta->chain_end)
418 || (dir == 'b' && w_shift == wmeta->chain_start))
423 /* Suspend all visible windows, remember their order in wins[]. */
425 for (w_p = wmeta->chain_start, i_max = 1;
426 w_p != wmeta->chain_end;
431 struct Win ** wins = malloc(i_max * sizeof(struct Win *));
432 for (i = 0, w_p = wmeta->chain_start;
436 w_p_next = w_p->next;
437 suspend_win(wmeta, w_p);
442 /* Re-append all previously visible windows in the new order. */
447 append_win(wmeta, w_shift);
448 for (i = 0; i < i_max - 1; i++)
450 append_win(wmeta, wins[i]);
455 for (i = 1; i < i_max; i++)
457 append_win(wmeta, wins[i]);
459 append_win(wmeta, w_shift);
464 for (i = 0; i < i_max; i++)
466 if ( (dir == 'f' && w_shift == wins[i])
467 || (dir == 'b' && w_shift == wins[i+1]))
469 append_win(wmeta, wins[i+1]);
470 append_win(wmeta, wins[i]);
475 append_win(wmeta, wins[i]);
481 wmeta->active = w_shift; /* Otherwise lastly appended win is active. */
487 extern void draw_all_wins(struct WinMeta * wmeta)
489 /* Empty everything before filling it a-new. */
491 wnoutrefresh(wmeta->screen);
492 werase(wmeta->pad.curses_win);
493 if (wmeta->chain_start)
496 /* Draw windows' contents first, then their borders. */
497 draw_wins(wmeta->chain_start);
498 draw_wins_borderlines(wmeta->chain_start, wmeta->active);
499 draw_wins_bordercorners(wmeta->chain_start, wmeta->pad.curses_win);
501 /* Draw virtual screen scroll hints. */
502 if (wmeta->pad_offset > 0)
504 draw_scroll_hint(&wmeta->pad,
505 wmeta->pad_offset, wmeta->pad_offset + 1, '<');
507 if (wmeta->pad_offset + wmeta->pad.size.x
508 < getmaxx(wmeta->pad.curses_win) - 1)
510 draw_scroll_hint(&wmeta->pad,
511 wmeta->pad_offset + wmeta->pad.size.x - 1,
512 getmaxx(wmeta->pad.curses_win)
513 - (wmeta->pad_offset + wmeta->pad.size.x), '>');
516 /* Write virtual screen segment to be shown on physical screen into */
517 /* ncurses screen buffer. */
518 pnoutrefresh(wmeta->pad.curses_win, 0, wmeta->pad_offset, 0, 0,
519 wmeta->pad.size.y, wmeta->pad.size.x-1);
522 /* Only at the end write accumulated changes to the physical screen. */
528 extern void draw_scroll_hint(struct Frame * frame, uint16_t pos, uint32_t dist,
531 /* Decide on alignment (vertical/horizontal?), thereby scroll hint text. */
532 char * more = "more";
533 char * unit_cols = "columns";
534 char * unit_rows = "lines";
535 uint16_t dsc_space = frame->size.x;
536 char * unit = unit_rows;
537 if ('<' == dir || '>' == dir)
539 dsc_space = frame->size.y;
542 char * scrolldsc = malloc((4 * sizeof(char)) + strlen(more) + strlen(unit)
543 + 10); /* 10 = uint32 max strlen */
544 sprintf(scrolldsc, " %d %s %s ", dist, more, unit);
546 /* Decide on offset of the description text inside the scroll hint line. */
548 if (dsc_space > strlen(scrolldsc) + 1)
550 offset = (dsc_space - strlen(scrolldsc)) / 2;
553 /* Draw scroll hint line as dir symbols bracketing description text. */
555 for (q = 0; q < dsc_space; q++)
557 if (q >= offset && q < strlen(scrolldsc) + offset)
559 symbol = scrolldsc[q - offset] | A_REVERSE;
563 symbol = dir | A_REVERSE;
565 if ('<' == dir || '>' == dir)
567 mvwaddch(frame->curses_win, q, pos, symbol);
571 mvwaddch(frame->curses_win, pos, q, symbol);