source: window.c @ 7a6e6c7

release-1.7release-1.8release-1.9
Last change on this file since 7a6e6c7 was 7a6e6c7, checked in by David Benjamin <davidben@mit.edu>, 11 years ago
Use signals for redraw and resize
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File size: 11.2 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 void _owl_window_redraw_cleanup(owl_window *w, WINDOW *win);
45
46G_DEFINE_TYPE (OwlWindow, owl_window, G_TYPE_OBJECT)
47
48static void owl_window_class_init (OwlWindowClass *klass)
49{
50  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
51
52  /* Set up the vtabl */
53  gobject_class->dispose = owl_window_dispose;
54  gobject_class->finalize = owl_window_finalize;
55
56  klass->redraw = _owl_window_redraw_cleanup;
57  klass->resized = NULL;
58
59  /* Create the signals, remember IDs */
60  window_signals[REDRAW] =
61    g_signal_new("redraw",
62                 G_TYPE_FROM_CLASS(gobject_class),
63                 G_SIGNAL_RUN_CLEANUP,
64                 G_STRUCT_OFFSET(OwlWindowClass, redraw),
65                 NULL, NULL,
66                 g_cclosure_marshal_VOID__POINTER,
67                 G_TYPE_NONE,
68                 1,
69                 G_TYPE_POINTER, NULL);
70
71  /* TODO: maybe type should be VOID__INT_INT_INT_INT; will need to generate a
72   * marshaller */
73  window_signals[RESIZED] =
74    g_signal_new("resized",
75                 G_TYPE_FROM_CLASS(gobject_class),
76                 G_SIGNAL_RUN_FIRST,
77                 G_STRUCT_OFFSET(OwlWindowClass, resized),
78                 NULL, NULL,
79                 g_cclosure_marshal_VOID__VOID,
80                 G_TYPE_NONE,
81                 0,
82                 NULL);
83}
84
85static void owl_window_dispose (GObject *object)
86{
87  owl_window *w = OWL_WINDOW (object);
88
89  /* Unmap the window */
90  owl_window_hide (w);
91
92  /* Unlink and unref all children */
93  while (w->child) {
94    owl_window *child = w->child;
95    owl_window_unlink (child);
96  }
97
98  /* Remove from hierarchy */
99  owl_window_unlink (w);
100
101  G_OBJECT_CLASS (owl_window_parent_class)->dispose (object);
102}
103
104static void owl_window_finalize (GObject *object)
105{
106  owl_window *w = OWL_WINDOW(object);
107
108  if (w->pan) {
109    del_panel(w->pan);
110    w->pan = NULL;
111  }
112
113  G_OBJECT_CLASS (owl_window_parent_class)->finalize (object);
114}
115
116static void owl_window_init (owl_window *w)
117{
118}
119
120/** singletons **/
121
122static WINDOW *_dummy_window(void)
123{
124  static WINDOW *dummy = NULL;
125  if (!dummy) {
126    dummy = newwin(1, 1, 0, 0);
127  }
128  return dummy;
129}
130
131owl_window *owl_window_get_screen(void)
132{
133  static owl_window *screen = NULL;
134  if (!screen) {
135    /* The screen is magical. It's 'shown', but the only mean of it going
136     * invisible is if we're tore down curses (i.e. screen resize) */
137    screen = _owl_window_new(NULL, g.lines, g.cols, 0, 0);
138    screen->is_screen = 1;
139    owl_window_show(screen);
140  }
141  return screen;
142}
143
144/** Creation and Destruction **/
145
146owl_window *owl_window_new(owl_window *parent)
147{
148  if (!parent)
149    parent = owl_window_get_screen();
150  return _owl_window_new(parent, 0, 0, 0, 0);
151}
152
153static owl_window *_owl_window_new(owl_window *parent, int nlines, int ncols, int begin_y, int begin_x)
154{
155  owl_window *w;
156
157  w = g_object_new (OWL_TYPE_WINDOW, NULL);
158  if (w == NULL) g_error("Failed to create owl_window instance");
159
160  w->nlines = nlines;
161  w->ncols = ncols;
162  w->begin_y = begin_y;
163  w->begin_x = begin_x;
164
165  _owl_window_link(w, parent);
166  if (parent && parent->is_screen) {
167    w->pan = new_panel(_dummy_window());
168    set_panel_userptr(w->pan, w);
169  }
170
171  return w;
172}
173
174/** Hierarchy **/
175
176void owl_window_unlink(owl_window *w)
177{
178  /* make sure the window is unmapped first */
179  _owl_window_unrealize(w);
180  /* unlink parent/child information */
181  if (w->parent) {
182    if (w->prev)
183      w->prev->next = w->next;
184    if (w->next)
185      w->next->prev = w->prev;
186    if (w->parent->child == w)
187      w->parent->child = w->next;
188    w->parent = NULL;
189    g_object_unref (w);
190  }
191}
192
193static void _owl_window_link(owl_window *w, owl_window *parent)
194{
195  if (w->parent == parent)
196    return;
197
198  owl_window_unlink(w);
199  if (parent) {
200    w->parent = parent;
201    w->next = parent->child;
202    parent->child = w;
203    g_object_ref (w);
204  }
205}
206
207/* mimic g_list_foreach for consistency */
208void owl_window_children_foreach(owl_window *parent, GFunc func, gpointer user_data)
209{
210  owl_window *w;
211  for (w = parent->child;
212       w != NULL;
213       w = w->next) {
214    func(w, user_data);
215  }
216}
217
218owl_window *owl_window_get_parent(owl_window *w)
219{
220  return w->parent;
221}
222
223/** Internal window management **/
224
225static void _owl_window_create_curses(owl_window *w)
226{
227  if (w->is_screen) {
228    resizeterm(w->nlines, w->ncols);
229    w->win = stdscr;
230  } else if (w->pan) {
231    w->win = newwin(w->nlines, w->ncols, w->begin_y, w->begin_x);
232    replace_panel(w->pan, w->win);
233  } else {
234    if (w->parent == NULL || w->parent->win == NULL)
235      return;
236    w->win = derwin(w->parent->win, w->nlines, w->ncols, w->begin_y, w->begin_x);
237  }
238}
239
240static void _owl_window_destroy_curses(owl_window *w)
241{
242  if (w->is_screen) {
243    /* don't deallocate the dummy */
244    w->win = NULL;
245  } else {
246    if (w->pan) {
247      /* panels assume their windows always exist, so we put in a fake one */
248      replace_panel(w->pan, _dummy_window());
249    }
250    if (w->win) {
251      /* and destroy our own window */
252      delwin(w->win);
253      w->win = NULL;
254    }
255  }
256}
257
258void owl_window_show(owl_window *w)
259{
260  w->shown = 1;
261  _owl_window_realize(w);
262  if (w->pan)
263    show_panel(w->pan);
264}
265
266void owl_window_show_all(owl_window *w)
267{
268  owl_window_show(w);
269  owl_window_children_foreach(w, (GFunc)owl_window_show, 0);
270}
271
272void owl_window_hide(owl_window *w)
273{
274  /* you can't unmap the screen */
275  if (w->is_screen)
276    return;
277  w->shown = 0;
278  if (w->pan)
279    hide_panel(w->pan);
280  _owl_window_unrealize(w);
281}
282
283int owl_window_is_shown(owl_window *w)
284{
285  return w->shown;
286}
287
288int owl_window_is_realized(owl_window *w)
289{
290  return w->win != NULL;
291}
292
293int owl_window_is_toplevel(owl_window *w)
294{
295  return w->pan != NULL;
296}
297
298static void _owl_window_realize(owl_window *w)
299{
300  /* check if we can create a window */
301  if ((w->parent && w->parent->win == NULL)
302      || !w->shown
303      || w->win != NULL)
304    return;
305  _owl_window_create_curses(w);
306  if (w->win == NULL)
307    return;
308  /* schedule a repaint */
309  owl_window_dirty(w);
310  /* map the children */
311  owl_window_children_foreach(w, (GFunc)_owl_window_realize, 0);
312}
313
314static void _owl_window_unrealize(owl_window *w)
315{
316  if (w->win == NULL)
317    return;
318  /* unmap all the children */
319  owl_window_children_foreach(w, (GFunc)_owl_window_unrealize, 0);
320  _owl_window_destroy_curses(w);
321  /* subwins leave a mess in the parent; dirty it */
322  if (w->parent)
323    owl_window_dirty(w->parent);
324}
325
326/** Painting and book-keeping **/
327
328void owl_window_dirty(owl_window *w)
329{
330  /* don't put the screen on this list; pointless */
331  if (w->is_screen)
332    return;
333  if (!owl_window_is_realized(w))
334    return;
335  if (!w->dirty) {
336    w->dirty = 1;
337    while (w && !w->dirty_subtree) {
338      w->dirty_subtree = 1;
339      w = w->parent;
340    }
341    owl_global_set_needrefresh(&g);
342  }
343}
344
345void owl_window_dirty_children(owl_window *w)
346{
347  owl_window_children_foreach(w, (GFunc)owl_window_dirty, 0);
348}
349
350static void _owl_window_redraw(owl_window *w)
351{
352  if (!w->dirty) return;
353  if (w->win) {
354    g_signal_emit(w, window_signals[REDRAW], 0, w->win);
355  }
356  w->dirty = 0;
357}
358
359static void _owl_window_redraw_subtree(owl_window *w)
360{
361  if (!w->dirty_subtree)
362    return;
363  _owl_window_redraw(w);
364  owl_window_children_foreach(w, (GFunc)_owl_window_redraw_subtree, 0);
365}
366
367/*
368Redraw all the windows with scheduled redraws.
369NOTE: This function shouldn't be called outside the event loop
370*/
371void owl_window_redraw_scheduled(void)
372{
373  _owl_window_redraw_subtree(owl_window_get_screen());
374}
375
376static void _owl_window_redraw_cleanup(owl_window *w, WINDOW *win)
377{
378  wsyncup(win);
379}
380
381void owl_window_erase_cb(owl_window *w, WINDOW *win, void *user_data)
382{
383  werase(win);
384  owl_window_dirty_children(w);
385}
386
387/** Window position **/
388
389void owl_window_get_position(owl_window *w, int *nlines, int *ncols, int *begin_y, int *begin_x)
390{
391  if (nlines)  *nlines  = w->nlines;
392  if (ncols)   *ncols   = w->ncols;
393  if (begin_y) *begin_y = w->begin_y;
394  if (begin_x) *begin_x = w->begin_x;
395}
396
397void owl_window_move(owl_window *w, int begin_y, int begin_x)
398{
399  if (w->is_screen) return; /* can't move the screen */
400  if (w->begin_y == begin_y && w->begin_x == begin_x) return;
401
402  w->begin_y = begin_y;
403  w->begin_x = begin_x;
404  if (w->shown) {
405    /* Window is shown, we must try to have a window at the end */
406    if (w->win) {
407      /* We actually do have a window; let's move it */
408      if (w->pan) {
409        if (move_panel(w->pan, begin_y, begin_x) == OK)
410          return;
411      } else {
412        if (mvderwin(w->win, begin_y, begin_x) == OK) {
413          /* now both we and the parent are dirty */
414          owl_window_dirty(w->parent);
415          owl_window_dirty(w);
416          return;
417        }
418      }
419    }
420    /* We don't have a window or failed to move it. Fine. Brute force. */
421    _owl_window_unrealize(w);
422    _owl_window_realize(w);
423  }
424}
425
426void owl_window_set_position(owl_window *w, int nlines, int ncols, int begin_y, int begin_x)
427{
428  /* can't move the screen */
429  if (w->is_screen) {
430    begin_y = begin_x = 0;
431  }
432
433  if (w->nlines == nlines && w->ncols == ncols) {
434    /* moving is easier */
435    owl_window_move(w, begin_y, begin_x);
436    return;
437  }
438
439  w->begin_y = begin_y;
440  w->begin_x = begin_x;
441  w->nlines = nlines;
442  w->ncols = ncols;
443  /* window is shown, we must try to have a window at the end */
444  if (w->shown) {
445    /* resizing in ncurses is hard: give up do a unrealize/realize */
446    _owl_window_unrealize(w);
447  }
448  g_signal_emit(w, window_signals[RESIZED], 0);
449  if (w->shown) {
450    _owl_window_realize(w);
451  }
452}
453
454void owl_window_resize(owl_window *w, int nlines, int ncols)
455{
456  owl_window_set_position(w, nlines, ncols, w->begin_y, w->begin_x);
457}
458
459/** Stacking order **/
460
461void owl_window_top(owl_window *w) {
462  if (!w->pan) {
463    owl_function_debugmsg("Warning: owl_window_top only makes sense on top-level window");
464    return;
465  }
466  top_panel(w->pan);
467}
468
469owl_window *owl_window_above(owl_window *w) {
470  PANEL *pan;
471
472  if (!w->pan) {
473    owl_function_debugmsg("Warning: owl_window_above only makes sense on top-level window");
474    return NULL;
475  }
476  pan = panel_above(w->pan);
477  /* cast because panel_userptr pointlessly returns a const void * */
478  return pan ? (void*) panel_userptr(pan) : NULL;
479}
480
481owl_window *owl_window_below(owl_window *w) {
482  PANEL *pan;
483
484  if (!w->pan) {
485    owl_function_debugmsg("Warning: owl_window_above only makes sense on top-level window");
486    return NULL;
487  }
488  pan = panel_below(w->pan);
489  /* cast because panel_userptr pointlessly returns a const void * */
490  return pan ? (void*) panel_userptr(pan) : NULL;
491}
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