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[dana/openbox.git] / openbox / focus_cycle.c
1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
2
3    focus_cycle.c for the Openbox window manager
4    Copyright (c) 2006        Mikael Magnusson
5    Copyright (c) 2003-2007   Dana Jansens
6
7    This program is free software; you can redistribute it and/or modify
8    it under the terms of the GNU General Public License as published by
9    the Free Software Foundation; either version 2 of the License, or
10    (at your option) any later version.
11
12    This program is distributed in the hope that it will be useful,
13    but WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15    GNU General Public License for more details.
16
17    See the COPYING file for a copy of the GNU General Public License.
18 */
19
20 #include "focus_cycle.h"
21 #include "focus_cycle_indicator.h"
22 #include "client.h"
23 #include "frame.h"
24 #include "focus.h"
25 #include "screen.h"
26 #include "openbox.h"
27 #include "debug.h"
28
29 #include <X11/Xlib.h>
30 #include <glib.h>
31
32 typedef enum {
33     OB_CYCLE_NONE = 0,
34     OB_CYCLE_NORMAL,
35     OB_CYCLE_DIRECTIONAL
36 } ObCycleType;
37
38 ObClient       *focus_cycle_target = NULL;
39 static ObCycleType focus_cycle_type = OB_CYCLE_NONE;
40 static gboolean focus_cycle_linear;
41 static gboolean focus_cycle_iconic_windows;
42 static gboolean focus_cycle_all_desktops;
43 static gboolean focus_cycle_nonhilite_windows;
44 static gboolean focus_cycle_dock_windows;
45 static gboolean focus_cycle_desktop_windows;
46
47 static ObClient *focus_find_directional(ObClient *c,
48                                         ObDirection dir,
49                                         gboolean dock_windows,
50                                         gboolean desktop_windows);
51
52 void focus_cycle_startup(gboolean reconfig)
53 {
54     if (reconfig) return;
55 }
56
57 void focus_cycle_shutdown(gboolean reconfig)
58 {
59     if (reconfig) return;
60 }
61
62 void focus_cycle_addremove(ObClient *c, gboolean redraw)
63 {
64     if (!focus_cycle_type)
65         return;
66
67     if (focus_cycle_type == OB_CYCLE_DIRECTIONAL) {
68         if (c && focus_cycle_target == c) {
69             focus_directional_cycle(0, TRUE, TRUE, TRUE, TRUE,
70                                     TRUE, TRUE, TRUE);
71         }
72     }
73     else if (c && redraw) {
74         gboolean v, s;
75
76         v = focus_cycle_valid(c);
77         s = focus_cycle_popup_is_showing(c) || c == focus_cycle_target;
78
79         if (v != s)
80             focus_cycle_reorder();
81     }
82     else if (redraw) {
83         focus_cycle_reorder();
84     }
85 }
86
87 void focus_cycle_reorder()
88 {
89     if (focus_cycle_type == OB_CYCLE_NORMAL) {
90         focus_cycle_target = focus_cycle_popup_refresh(focus_cycle_target,
91                                                        TRUE,
92                                                        focus_cycle_linear);
93         focus_cycle_update_indicator(focus_cycle_target);
94         if (!focus_cycle_target)
95             focus_cycle(TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
96                         TRUE, OB_FOCUS_CYCLE_POPUP_MODE_NONE,
97                         TRUE, TRUE);
98     }
99 }
100
101 ObClient* focus_cycle(gboolean forward, gboolean all_desktops,
102                       gboolean nonhilite_windows,
103                       gboolean dock_windows, gboolean desktop_windows,
104                       gboolean linear, gboolean showbar,
105                       ObFocusCyclePopupMode mode,
106                       gboolean done, gboolean cancel)
107 {
108     static GList *order = NULL;
109     GList *it, *start, *list;
110     ObClient *ft = NULL;
111     ObClient *ret = NULL;
112
113     if (cancel) {
114         focus_cycle_target = NULL;
115         goto done_cycle;
116     } else if (done)
117         goto done_cycle;
118
119     if (!focus_order)
120         goto done_cycle;
121
122     if (linear) list = client_list;
123     else        list = focus_order;
124
125     if (focus_cycle_target == NULL) {
126         focus_cycle_linear = linear;
127         focus_cycle_iconic_windows = TRUE;
128         focus_cycle_all_desktops = all_desktops;
129         focus_cycle_nonhilite_windows = nonhilite_windows;
130         focus_cycle_dock_windows = dock_windows;
131         focus_cycle_desktop_windows = desktop_windows;
132         start = it = g_list_find(list, focus_client);
133     } else
134         start = it = g_list_find(list, focus_cycle_target);
135
136     if (!start) /* switched desktops or something? */
137         start = it = forward ? g_list_last(list) : g_list_first(list);
138     if (!start) goto done_cycle;
139
140     do {
141         if (forward) {
142             it = it->next;
143             if (it == NULL) it = g_list_first(list);
144         } else {
145             it = it->prev;
146             if (it == NULL) it = g_list_last(list);
147         }
148         ft = it->data;
149         if (focus_cycle_valid(ft)) {
150             if (ft != focus_cycle_target) { /* prevents flicker */
151                 focus_cycle_target = ft;
152                 focus_cycle_type = OB_CYCLE_NORMAL;
153                 focus_cycle_draw_indicator(showbar ? ft : NULL);
154             }
155             /* same arguments as focus_target_valid */
156             focus_cycle_popup_show(ft, mode, focus_cycle_linear);
157             return focus_cycle_target;
158         }
159     } while (it != start);
160
161 done_cycle:
162     if (done && !cancel) ret = focus_cycle_target;
163
164     focus_cycle_target = NULL;
165     focus_cycle_type = OB_CYCLE_NONE;
166     g_list_free(order);
167     order = NULL;
168
169     focus_cycle_draw_indicator(NULL);
170     focus_cycle_popup_hide();
171
172     return ret;
173 }
174
175 /* this be mostly ripped from fvwm */
176 static ObClient *focus_find_directional(ObClient *c, ObDirection dir,
177                                         gboolean dock_windows,
178                                         gboolean desktop_windows)
179 {
180     gint my_cx, my_cy, his_cx, his_cy;
181     gint offset = 0;
182     gint distance = 0;
183     gint score, best_score;
184     ObClient *best_client, *cur;
185     GList *it;
186
187     if (!client_list)
188         return NULL;
189
190     /* first, find the centre coords of the currently focused window */
191     my_cx = c->frame->area.x + c->frame->area.width / 2;
192     my_cy = c->frame->area.y + c->frame->area.height / 2;
193
194     best_score = -1;
195     best_client = c;
196
197     for (it = g_list_first(client_list); it; it = g_list_next(it)) {
198         cur = it->data;
199
200         /* the currently selected window isn't interesting */
201         if (cur == c)
202             continue;
203         if (!focus_cycle_valid(it->data))
204             continue;
205
206         /* find the centre coords of this window, from the
207          * currently focused window's point of view */
208         his_cx = (cur->frame->area.x - my_cx)
209             + cur->frame->area.width / 2;
210         his_cy = (cur->frame->area.y - my_cy)
211             + cur->frame->area.height / 2;
212
213         if (dir == OB_DIRECTION_NORTHEAST || dir == OB_DIRECTION_SOUTHEAST ||
214             dir == OB_DIRECTION_SOUTHWEST || dir == OB_DIRECTION_NORTHWEST)
215         {
216             gint tx;
217             /* Rotate the diagonals 45 degrees counterclockwise.
218              * To do this, multiply the matrix /+h +h\ with the
219              * vector (x y).                   \-h +h/
220              * h = sqrt(0.5). We can set h := 1 since absolute
221              * distance doesn't matter here. */
222             tx = his_cx + his_cy;
223             his_cy = -his_cx + his_cy;
224             his_cx = tx;
225         }
226
227         switch (dir) {
228         case OB_DIRECTION_NORTH:
229         case OB_DIRECTION_SOUTH:
230         case OB_DIRECTION_NORTHEAST:
231         case OB_DIRECTION_SOUTHWEST:
232             offset = (his_cx < 0) ? -his_cx : his_cx;
233             distance = ((dir == OB_DIRECTION_NORTH ||
234                          dir == OB_DIRECTION_NORTHEAST) ?
235                         -his_cy : his_cy);
236             break;
237         case OB_DIRECTION_EAST:
238         case OB_DIRECTION_WEST:
239         case OB_DIRECTION_SOUTHEAST:
240         case OB_DIRECTION_NORTHWEST:
241             offset = (his_cy < 0) ? -his_cy : his_cy;
242             distance = ((dir == OB_DIRECTION_WEST ||
243                          dir == OB_DIRECTION_NORTHWEST) ?
244                         -his_cx : his_cx);
245             break;
246         }
247
248         /* the target must be in the requested direction */
249         if (distance <= 0)
250             continue;
251
252         /* Calculate score for this window.  The smaller the better. */
253         score = distance + offset;
254
255         /* windows more than 45 degrees off the direction are
256          * heavily penalized and will only be chosen if nothing
257          * else within a million pixels */
258         if (offset > distance)
259             score += 1000000;
260
261         if (best_score == -1 || score < best_score) {
262             best_client = cur;
263             best_score = score;
264         }
265     }
266
267     return best_client;
268 }
269
270 ObClient* focus_directional_cycle(ObDirection dir, gboolean dock_windows,
271                                   gboolean desktop_windows,
272                                   gboolean interactive,
273                                   gboolean showbar, gboolean dialog,
274                                   gboolean done, gboolean cancel)
275 {
276     static ObClient *first = NULL;
277     ObClient *ft = NULL;
278     ObClient *ret = NULL;
279
280     if (cancel) {
281         focus_cycle_target = NULL;
282         goto done_cycle;
283     } else if (done && interactive)
284         goto done_cycle;
285
286     if (!focus_order)
287         goto done_cycle;
288
289     if (focus_cycle_target == NULL) {
290         focus_cycle_linear = FALSE;
291         focus_cycle_iconic_windows = FALSE;
292         focus_cycle_all_desktops = FALSE;
293         focus_cycle_nonhilite_windows = TRUE;
294         focus_cycle_dock_windows = dock_windows;
295         focus_cycle_desktop_windows = desktop_windows;
296     }
297
298     if (!first) first = focus_client;
299
300     if (focus_cycle_target)
301         ft = focus_find_directional(focus_cycle_target, dir, dock_windows,
302                                     desktop_windows);
303     else if (first)
304         ft = focus_find_directional(first, dir, dock_windows, desktop_windows);
305     else {
306         GList *it;
307
308         for (it = focus_order; it; it = g_list_next(it))
309             if (focus_cycle_valid(it->data)) {
310                 ft = it->data;
311                 break;
312             }
313     }
314
315     if (ft && ft != focus_cycle_target) {/* prevents flicker */
316         focus_cycle_target = ft;
317         focus_cycle_type = OB_CYCLE_DIRECTIONAL;
318         if (!interactive)
319             goto done_cycle;
320         focus_cycle_draw_indicator(showbar ? ft : NULL);
321     }
322     if (focus_cycle_target && dialog)
323         /* same arguments as focus_target_valid */
324         focus_cycle_popup_single_show(focus_cycle_target);
325     return focus_cycle_target;
326
327 done_cycle:
328     if (done && !cancel) ret = focus_cycle_target;
329
330     first = NULL;
331     focus_cycle_target = NULL;
332     focus_cycle_type = OB_CYCLE_NONE;
333
334     focus_cycle_draw_indicator(NULL);
335     focus_cycle_popup_single_hide();
336
337     return ret;
338 }
339
340 gboolean focus_cycle_valid(struct _ObClient *client)
341 {
342     return focus_valid_target(client, screen_desktop, TRUE,
343                               focus_cycle_iconic_windows,
344                               focus_cycle_all_desktops,
345                               focus_cycle_nonhilite_windows,
346                               focus_cycle_dock_windows,
347                               focus_cycle_desktop_windows,
348                               FALSE);
349 }