source: window.c @ 95d54e6

release-1.7release-1.8release-1.9
Last change on this file since 95d54e6 was 33b64f22, checked in by David Benjamin <davidben@mit.edu>, 11 years ago
has_children and num_children aren't really necessary
  • Property mode set to 100644
File size: 12.3 KB
Line 
1#include "owl.h"
2
3#include <assert.h>
4
5struct _owl_window { /*noproto*/
6  GObject object;
7  /* hierarchy information */
8  owl_window *parent;
9  owl_window *child;
10  owl_window *next, *prev;
11  /* flags */
12  int dirty : 1;
13  int dirty_subtree : 1;
14  int shown : 1;
15  int is_screen : 1;
16  /* window information */
17  WINDOW *win;
18  PANEL *pan;
19  int nlines, ncols;
20  int begin_y, begin_x;
21};
22
23enum {
24  REDRAW,
25  RESIZED,
26  LAST_SIGNAL
27};
28
29static guint window_signals[LAST_SIGNAL] = { 0 };
30
31static void owl_window_dispose(GObject *gobject);
32static void owl_window_finalize(GObject *gobject);
33
34static owl_window *_owl_window_new(owl_window *parent, int nlines, int ncols, int begin_y, int begin_x);
35
36static void _owl_window_link(owl_window *w, owl_window *parent);
37
38static void _owl_window_create_curses(owl_window *w);
39static void _owl_window_destroy_curses(owl_window *w);
40
41static void _owl_window_realize(owl_window *w);
42static void _owl_window_unrealize(owl_window *w);
43
44static owl_window *cursor_owner;
45static owl_window *default_cursor;
46
47G_DEFINE_TYPE (OwlWindow, owl_window, G_TYPE_OBJECT)
48
49static void owl_window_class_init (OwlWindowClass *klass)
50{
51  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
52
53  /* Set up the vtabl */
54  gobject_class->dispose = owl_window_dispose;
55  gobject_class->finalize = owl_window_finalize;
56
57  klass->redraw = NULL;
58  klass->resized = NULL;
59
60  /* Create the signals, remember IDs */
61  window_signals[REDRAW] =
62    g_signal_new("redraw",
63                 G_TYPE_FROM_CLASS(gobject_class),
64                 G_SIGNAL_RUN_CLEANUP,
65                 G_STRUCT_OFFSET(OwlWindowClass, redraw),
66                 NULL, NULL,
67                 g_cclosure_marshal_VOID__POINTER,
68                 G_TYPE_NONE,
69                 1,
70                 G_TYPE_POINTER, NULL);
71
72  /* TODO: maybe type should be VOID__INT_INT_INT_INT; will need to generate a
73   * marshaller */
74  window_signals[RESIZED] =
75    g_signal_new("resized",
76                 G_TYPE_FROM_CLASS(gobject_class),
77                 G_SIGNAL_RUN_FIRST,
78                 G_STRUCT_OFFSET(OwlWindowClass, resized),
79                 NULL, NULL,
80                 g_cclosure_marshal_VOID__VOID,
81                 G_TYPE_NONE,
82                 0,
83                 NULL);
84}
85
86static void owl_window_dispose (GObject *object)
87{
88  owl_window *w = OWL_WINDOW (object);
89
90  /* Unmap the window */
91  owl_window_hide (w);
92
93  /* Unlink and unref all children */
94  while (w->child) {
95    owl_window *child = w->child;
96    owl_window_unlink (child);
97  }
98
99  /* Remove from hierarchy */
100  owl_window_unlink (w);
101
102  G_OBJECT_CLASS (owl_window_parent_class)->dispose (object);
103}
104
105static void owl_window_finalize (GObject *object)
106{
107  owl_window *w = OWL_WINDOW(object);
108
109  if (w->pan) {
110    del_panel(w->pan);
111    w->pan = NULL;
112  }
113
114  G_OBJECT_CLASS (owl_window_parent_class)->finalize (object);
115}
116
117static void owl_window_init (owl_window *w)
118{
119}
120
121/** singletons **/
122
123static WINDOW *_dummy_window(void)
124{
125  static WINDOW *dummy = NULL;
126  if (!dummy) {
127    dummy = newwin(1, 1, 0, 0);
128  }
129  return dummy;
130}
131
132owl_window *owl_window_get_screen(void)
133{
134  static owl_window *screen = NULL;
135  if (!screen) {
136    /* The screen is magical. It's 'shown', but the only mean of it going
137     * invisible is if we're tore down curses (i.e. screen resize) */
138    screen = _owl_window_new(NULL, g.lines, g.cols, 0, 0);
139    screen->is_screen = 1;
140    owl_window_show(screen);
141  }
142  return screen;
143}
144
145/** Creation and Destruction **/
146
147owl_window *owl_window_new(owl_window *parent)
148{
149  if (!parent)
150    parent = owl_window_get_screen();
151  return _owl_window_new(parent, 0, 0, 0, 0);
152}
153
154static owl_window *_owl_window_new(owl_window *parent, int nlines, int ncols, int begin_y, int begin_x)
155{
156  owl_window *w;
157
158  w = g_object_new (OWL_TYPE_WINDOW, NULL);
159  if (w == NULL) g_error("Failed to create owl_window instance");
160
161  w->nlines = nlines;
162  w->ncols = ncols;
163  w->begin_y = begin_y;
164  w->begin_x = begin_x;
165
166  _owl_window_link(w, parent);
167  if (parent && parent->is_screen) {
168    w->pan = new_panel(_dummy_window());
169    set_panel_userptr(w->pan, w);
170  }
171
172  return w;
173}
174
175/** Hierarchy **/
176
177void owl_window_unlink(owl_window *w)
178{
179  /* make sure the window is unmapped first */
180  _owl_window_unrealize(w);
181  /* unlink parent/child information */
182  if (w->parent) {
183    if (w->prev)
184      w->prev->next = w->next;
185    if (w->next)
186      w->next->prev = w->prev;
187    if (w->parent->child == w)
188      w->parent->child = w->next;
189    w->parent = NULL;
190    g_object_unref (w);
191  }
192}
193
194static void _owl_window_link(owl_window *w, owl_window *parent)
195{
196  if (w->parent == parent)
197    return;
198
199  owl_window_unlink(w);
200  if (parent) {
201    w->parent = parent;
202    w->next = parent->child;
203    parent->child = w;
204    g_object_ref (w);
205  }
206}
207
208/* mimic g_list_foreach for consistency */
209void owl_window_children_foreach(owl_window *parent, GFunc func, gpointer user_data)
210{
211  owl_window *w;
212  for (w = parent->child;
213       w != NULL;
214       w = w->next) {
215    func(w, user_data);
216  }
217}
218
219owl_window *owl_window_parent(owl_window *w)
220{
221  return w->parent;
222}
223
224owl_window *owl_window_first_child(owl_window *w)
225{
226  return w->child;
227}
228
229owl_window *owl_window_next_sibling(owl_window *w)
230{
231  return w->next;
232}
233
234owl_window *owl_window_previous_sibling(owl_window *w)
235{
236  return w->prev;
237}
238
239/** Internal window management **/
240
241static void _owl_window_create_curses(owl_window *w)
242{
243  if (w->is_screen) {
244    resizeterm(w->nlines, w->ncols);
245    w->win = stdscr;
246  } else {
247    /* Explicitly disallow realizing an unlinked non-root */
248    if (w->parent == NULL || w->parent->win == NULL)
249      return;
250    if (w->pan) {
251      w->win = newwin(w->nlines, w->ncols, w->begin_y, w->begin_x);
252      replace_panel(w->pan, w->win);
253    } else {
254      w->win = derwin(w->parent->win, w->nlines, w->ncols, w->begin_y, w->begin_x);
255    }
256  }
257}
258
259static void _owl_window_destroy_curses(owl_window *w)
260{
261  if (w->is_screen) {
262    /* don't deallocate the dummy */
263    w->win = NULL;
264  } else {
265    if (w->pan) {
266      /* panels assume their windows always exist, so we put in a fake one */
267      replace_panel(w->pan, _dummy_window());
268    }
269    if (w->win) {
270      /* and destroy our own window */
271      delwin(w->win);
272      w->win = NULL;
273    }
274  }
275}
276
277void owl_window_show(owl_window *w)
278{
279  w->shown = 1;
280  _owl_window_realize(w);
281  if (w->pan)
282    show_panel(w->pan);
283}
284
285void owl_window_show_all(owl_window *w)
286{
287  owl_window_show(w);
288  owl_window_children_foreach(w, (GFunc)owl_window_show, 0);
289}
290
291void owl_window_hide(owl_window *w)
292{
293  /* you can't unmap the screen */
294  if (w->is_screen)
295    return;
296  w->shown = 0;
297  if (w->pan)
298    hide_panel(w->pan);
299  _owl_window_unrealize(w);
300}
301
302int owl_window_is_shown(owl_window *w)
303{
304  return w->shown;
305}
306
307int owl_window_is_realized(owl_window *w)
308{
309  return w->win != NULL;
310}
311
312int owl_window_is_toplevel(owl_window *w)
313{
314  return w->pan != NULL;
315}
316
317static void _owl_window_realize(owl_window *w)
318{
319  /* check if we can create a window */
320  if ((w->parent && w->parent->win == NULL)
321      || !w->shown
322      || w->win != NULL)
323    return;
324  if (w->nlines <= 0 || w->ncols <= 0)
325    return;
326  _owl_window_create_curses(w);
327  if (w->win == NULL)
328    return;
329  /* schedule a repaint */
330  owl_window_dirty(w);
331  /* map the children */
332  owl_window_children_foreach(w, (GFunc)_owl_window_realize, 0);
333}
334
335static void _owl_window_unrealize(owl_window *w)
336{
337  if (w->win == NULL)
338    return;
339  /* unmap all the children */
340  owl_window_children_foreach(w, (GFunc)_owl_window_unrealize, 0);
341  _owl_window_destroy_curses(w);
342  w->dirty = w->dirty_subtree = 0;
343  /* subwins leave a mess in the parent; dirty it */
344  if (w->parent)
345    owl_window_dirty(w->parent);
346}
347
348/** Painting and book-keeping **/
349
350void owl_window_set_cursor(owl_window *w)
351{
352  if (cursor_owner)
353    g_object_remove_weak_pointer(G_OBJECT(cursor_owner), (gpointer*) &cursor_owner);
354  cursor_owner = w;
355  if (w)
356    g_object_add_weak_pointer(G_OBJECT(w), (gpointer*) &cursor_owner);
357  owl_global_set_needrefresh(&g);
358}
359
360void owl_window_set_default_cursor(owl_window *w)
361{
362  if (default_cursor)
363    g_object_remove_weak_pointer(G_OBJECT(default_cursor), (gpointer*) &default_cursor);
364  default_cursor = w;
365  if (w)
366    g_object_add_weak_pointer(G_OBJECT(w), (gpointer*) &default_cursor);
367  owl_global_set_needrefresh(&g);
368}
369
370static owl_window *_get_cursor(void)
371{
372  if (cursor_owner && owl_window_is_realized(cursor_owner))
373    return cursor_owner;
374  if (default_cursor && owl_window_is_realized(default_cursor))
375    return default_cursor;
376  return owl_window_get_screen();
377}
378
379void owl_window_dirty(owl_window *w)
380{
381  /* don't put the screen on this list; pointless */
382  if (w->is_screen)
383    return;
384  if (!owl_window_is_realized(w))
385    return;
386  if (!w->dirty) {
387    w->dirty = 1;
388    while (w && !w->dirty_subtree) {
389      w->dirty_subtree = 1;
390      w = w->parent;
391    }
392    owl_global_set_needrefresh(&g);
393  }
394}
395
396void owl_window_dirty_children(owl_window *w)
397{
398  owl_window_children_foreach(w, (GFunc)owl_window_dirty, 0);
399}
400
401static void _owl_window_redraw(owl_window *w)
402{
403  if (!w->dirty) return;
404  if (w->win) {
405    if (!owl_window_is_toplevel(w)) {
406      /* If a subwin, we might have gotten random touched lines from wsyncup or
407       * past drawing. That information is useless, so we discard it all */
408      untouchwin(w->win);
409    }
410    g_signal_emit(w, window_signals[REDRAW], 0, w->win);
411    wsyncup(w->win);
412  }
413  w->dirty = 0;
414}
415
416static void _owl_window_redraw_subtree(owl_window *w)
417{
418  if (!w->dirty_subtree)
419    return;
420  _owl_window_redraw(w);
421  owl_window_children_foreach(w, (GFunc)_owl_window_redraw_subtree, 0);
422  w->dirty_subtree = 0;
423}
424
425/*
426Redraw all the windows with scheduled redraws.
427NOTE: This function shouldn't be called outside the event loop
428*/
429void owl_window_redraw_scheduled(void)
430{
431  owl_window *cursor;
432
433  _owl_window_redraw_subtree(owl_window_get_screen());
434  update_panels();
435  cursor = _get_cursor();
436  if (cursor && cursor->win) {
437    /* untouch it to avoid drawing; window should be clean now, but we must
438     * clean up in case there was junk left over on a subwin (cleaning up after
439     * subwin drawing isn't sufficient because a wsyncup messes up subwin
440     * ancestors */
441    untouchwin(cursor->win);
442    wnoutrefresh(cursor->win);
443  }
444}
445
446/** Window position **/
447
448void owl_window_get_position(owl_window *w, int *nlines, int *ncols, int *begin_y, int *begin_x)
449{
450  if (nlines)  *nlines  = w->nlines;
451  if (ncols)   *ncols   = w->ncols;
452  if (begin_y) *begin_y = w->begin_y;
453  if (begin_x) *begin_x = w->begin_x;
454}
455
456void owl_window_move(owl_window *w, int begin_y, int begin_x)
457{
458  owl_window_set_position(w, w->nlines, w->ncols, begin_y, begin_x);
459#if 0
460  /* This routine tries to move a window efficiently, but begy and begx are
461   * then wrong. Currently, this only effects the wnoutrefresh to move cursor.
462   * TODO: fix that and reinstate this code if it's worth the trouble */
463  if (w->is_screen) return; /* can't move the screen */
464  if (w->begin_y == begin_y && w->begin_x == begin_x) return;
465
466  w->begin_y = begin_y;
467  w->begin_x = begin_x;
468  if (w->shown) {
469    /* Window is shown, we must try to have a window at the end */
470    if (w->win) {
471      /* We actually do have a window; let's move it */
472      if (w->pan) {
473        if (move_panel(w->pan, begin_y, begin_x) == OK)
474          return;
475      } else {
476        if (mvderwin(w->win, begin_y, begin_x) == OK) {
477          /* now both we and the parent are dirty */
478          owl_window_dirty(w->parent);
479          owl_window_dirty(w);
480          return;
481        }
482      }
483    }
484    /* We don't have a window or failed to move it. Fine. Brute force. */
485    _owl_window_unrealize(w);
486    _owl_window_realize(w);
487  }
488#endif
489}
490
491void owl_window_set_position(owl_window *w, int nlines, int ncols, int begin_y, int begin_x)
492{
493  int resized;
494  /* can't move the screen */
495  if (w->is_screen) {
496    begin_y = begin_x = 0;
497  }
498
499  if (w->nlines == nlines && w->ncols == ncols
500      && w->begin_y == begin_y && w->begin_x == begin_x) {
501    return;
502  }
503  resized = w->nlines != nlines || w->ncols != ncols;
504
505  _owl_window_unrealize(w);
506  w->begin_y = begin_y;
507  w->begin_x = begin_x;
508  w->nlines = nlines;
509  w->ncols = ncols;
510  if (resized)
511    g_signal_emit(w, window_signals[RESIZED], 0);
512  if (w->shown) {
513    /* ncurses is screwy: give up and recreate windows at the right place */
514    _owl_window_realize(w);
515  }
516}
517
518void owl_window_resize(owl_window *w, int nlines, int ncols)
519{
520  owl_window_set_position(w, nlines, ncols, w->begin_y, w->begin_x);
521}
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