Merge branch 'backport' into work
[mikachu/openbox.git] / openbox / resist.c
1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
2
3    resist.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 "resist.h"
21 #include "client.h"
22 #include "frame.h"
23 #include "stacking.h"
24 #include "screen.h"
25 #include "dock.h"
26 #include "config.h"
27
28 #include <glib.h>
29
30 static gboolean resist_move_window(Rect window,
31                                    Rect target, gint resist,
32                                    gint *x, gint *y)
33 {
34     gint l, t, r, b; /* requested edges */
35     gint cl, ct, cr, cb; /* current edges */
36     gint w, h; /* current size */
37     gint tl, tt, tr, tb; /* 1 past the target's edges on each side */
38     gboolean snapx = 0, snapy = 0;
39
40     w = window.width;
41     h = window.height;
42
43     l = *x;
44     t = *y;
45     r = l + w - 1;
46     b = t + h - 1;
47
48     cl = RECT_LEFT(window);
49     ct = RECT_TOP(window);
50     cr = RECT_RIGHT(window);
51     cb = RECT_BOTTOM(window);
52
53     tl = RECT_LEFT(target) - 1;
54     tt = RECT_TOP(target) - 1;
55     tr = RECT_RIGHT(target) + 1;
56     tb = RECT_BOTTOM(target) + 1;
57
58     /* snapx and snapy ensure that the window snaps to the top-most
59        window edge available, without going all the way from
60        bottom-to-top in the stacking list
61     */
62     if (!snapx) {
63         if (ct < tb && cb > tt) {
64             if (cl >= tr && l < tr && l >= tr - resist)
65                 *x = tr, snapx = TRUE;
66             else if (cr <= tl && r > tl &&
67                      r <= tl + resist)
68                 *x = tl - w + 1, snapx = TRUE;
69             if (snapx) {
70                 /* try to corner snap to the window */
71                 if (ct > tt && t <= tt &&
72                     t > tt - resist)
73                     *y = tt + 1, snapy = TRUE;
74                 else if (cb < tb && b >= tb &&
75                          b < tb + resist)
76                     *y = tb - h, snapy = TRUE;
77             }
78         }
79     }
80     if (!snapy) {
81         if (cl < tr && cr > tl) {
82             if (ct >= tb && t < tb && t >= tb - resist)
83                 *y = tb, snapy = TRUE;
84             else if (cb <= tt && b > tt &&
85                      b <= tt + resist)
86                 *y = tt - h + 1, snapy = TRUE;
87             if (snapy) {
88                 /* try to corner snap to the window */
89                 if (cl > tl && l <= tl &&
90                     l > tl - resist)
91                     *x = tl + 1, snapx = TRUE;
92                 else if (cr < tr && r >= tr &&
93                          r < tr + resist)
94                     *x = tr - w, snapx = TRUE;
95             }
96         }
97     }
98
99     return snapx && snapy;
100 }
101
102 void resist_move_windows(ObClient *c, gint resist, gint *x, gint *y)
103 {
104     GList *it;
105     Rect dock_area;
106
107     if (!resist) return;
108
109     frame_client_gravity(c->frame, x, y);
110
111
112     for (it = stacking_list; it; it = g_list_next(it)) {
113         ObClient *target;
114
115         if (!WINDOW_IS_CLIENT(it->data))
116             continue;
117         target = it->data;
118
119         /* don't snap to self or non-visibles */
120         if (!target->frame->visible || target == c)
121             continue;
122         /* don't snap to windows set to below and skip_taskbar (desklets) */
123         if (target->below && !c->below && target->skip_taskbar)
124             continue;
125
126         if (resist_move_window(c->frame->area, target->frame->area,
127                                resist, x, y))
128             break;
129     }
130     dock_get_area(&dock_area);
131     resist_move_window(c->frame->area, dock_area, resist, x, y);
132
133     frame_frame_gravity(c->frame, x, y);
134 }
135
136 void resist_move_monitors(ObClient *c, gint resist, gint *x, gint *y)
137 {
138     Rect *area, *parea;
139     guint i;
140     gint l, t, r, b; /* requested edges */
141     gint al, at, ar, ab; /* screen area edges */
142     gint pl, pt, pr, pb; /* physical screen area edges */
143     gint cl, ct, cr, cb; /* current edges */
144     gint w, h; /* current size */
145     Rect desired_area;
146
147     if (!resist) return;
148
149     frame_client_gravity(c->frame, x, y);
150
151     w = c->frame->area.width;
152     h = c->frame->area.height;
153
154     l = *x;
155     t = *y;
156     r = l + w - 1;
157     b = t + h - 1;
158
159     cl = RECT_LEFT(c->frame->area);
160     ct = RECT_TOP(c->frame->area);
161     cr = RECT_RIGHT(c->frame->area);
162     cb = RECT_BOTTOM(c->frame->area);
163
164     RECT_SET(desired_area, c->frame->area.x, c->frame->area.y,
165              c->frame->area.width, c->frame->area.height);
166
167     for (i = 0; i < screen_num_monitors; ++i) {
168         parea = screen_physical_area_monitor(i);
169
170         if (!RECT_INTERSECTS_RECT(*parea, c->frame->area)) {
171             g_free(parea);
172             continue;
173         }
174
175         area = screen_area(c->desktop, SCREEN_AREA_ALL_MONITORS,
176                            &desired_area);
177
178         al = RECT_LEFT(*area);
179         at = RECT_TOP(*area);
180         ar = RECT_RIGHT(*area);
181         ab = RECT_BOTTOM(*area);
182         pl = RECT_LEFT(*parea);
183         pt = RECT_TOP(*parea);
184         pr = RECT_RIGHT(*parea);
185         pb = RECT_BOTTOM(*parea);
186
187         if (cl >= al && l < al && l >= al - resist)
188             *x = al;
189         else if (cr <= ar && r > ar && r <= ar + resist)
190             *x = ar - w + 1;
191         else if (cl >= pl && l < pl && l >= pl - resist)
192             *x = pl;
193         else if (cr <= pr && r > pr && r <= pr + resist)
194             *x = pr - w + 1;
195
196         if (ct >= at && t < at && t >= at - resist)
197             *y = at;
198         else if (cb <= ab && b > ab && b < ab + resist)
199             *y = ab - h + 1;
200         else if (ct >= pt && t < pt && t >= pt - resist)
201             *y = pt;
202         else if (cb <= pb && b > pb && b < pb + resist)
203             *y = pb - h + 1;
204
205         g_free(area);
206         g_free(parea);
207     }
208
209     frame_frame_gravity(c->frame, x, y);
210 }
211
212 static gboolean resist_size_window(Rect window, Rect target, gint resist,
213                                    gint *w, gint *h, ObDirection dir)
214 {
215     gint l, t, r, b; /* my left, top, right and bottom sides */
216     gint tl, tt, tr, tb; /* target's left, top, right and bottom bottom sides*/
217     gint dlt, drb; /* my destination left/top and right/bottom sides */
218     gboolean snapx = 0, snapy = 0;
219     gint orgw, orgh;
220
221     l = RECT_LEFT(window);
222     t = RECT_TOP(window);
223     r = RECT_RIGHT(window);
224     b = RECT_BOTTOM(window);
225
226     orgw = window.width;
227     orgh = window.height;
228
229     tl = RECT_LEFT(target);
230     tt = RECT_TOP(target);
231     tr = RECT_RIGHT(target);
232     tb = RECT_BOTTOM(target);
233
234     if (!snapx) {
235         /* horizontal snapping */
236         if (t < tb && b > tt) {
237             switch (dir) {
238             case OB_DIRECTION_EAST:
239             case OB_DIRECTION_NORTHEAST:
240             case OB_DIRECTION_SOUTHEAST:
241             case OB_DIRECTION_NORTH:
242             case OB_DIRECTION_SOUTH:
243                 dlt = l;
244                 drb = r + *w - orgw;
245                 if (r < tl && drb >= tl &&
246                     drb < tl + resist)
247                     *w = tl - l, snapx = TRUE;
248                 break;
249             case OB_DIRECTION_WEST:
250             case OB_DIRECTION_NORTHWEST:
251             case OB_DIRECTION_SOUTHWEST:
252                 dlt = l - *w + orgw;
253                 drb = r;
254                 if (l > tr && dlt <= tr &&
255                     dlt > tr - resist)
256                     *w = r - tr, snapx = TRUE;
257                 break;
258             }
259         }
260     }
261
262     if (!snapy) {
263         /* vertical snapping */
264         if (l < tr && r > tl) {
265             switch (dir) {
266             case OB_DIRECTION_SOUTH:
267             case OB_DIRECTION_SOUTHWEST:
268             case OB_DIRECTION_SOUTHEAST:
269             case OB_DIRECTION_EAST:
270             case OB_DIRECTION_WEST:
271                 dlt = t;
272                 drb = b + *h - orgh;
273                 if (b < tt && drb >= tt &&
274                     drb < tt + resist)
275                     *h = tt - t, snapy = TRUE;
276                 break;
277             case OB_DIRECTION_NORTH:
278             case OB_DIRECTION_NORTHWEST:
279             case OB_DIRECTION_NORTHEAST:
280                 dlt = t - *h + orgh;
281                 drb = b;
282                 if (t > tb && dlt <= tb &&
283                     dlt > tb - resist)
284                     *h = b - tb, snapy = TRUE;
285                 break;
286             }
287         }
288     }
289
290     /* snapped both ways */
291     return snapx && snapy;
292 }
293
294 void resist_size_windows(ObClient *c, gint resist, gint *w, gint *h,
295                          ObDirection dir)
296 {
297     GList *it;
298     ObClient *target; /* target */
299     Rect dock_area;
300
301     if (!resist) return;
302
303     for (it = stacking_list; it; it = g_list_next(it)) {
304         if (!WINDOW_IS_CLIENT(it->data))
305             continue;
306         target = it->data;
307
308         /* don't snap to invisibles or ourself */
309         if (!target->frame->visible || target == c)
310             continue;
311         /* don't snap to windows set to below and skip_taskbar (desklets) */
312         if (target->below && !c->below && target->skip_taskbar)
313             continue;
314
315         if (resist_size_window(c->frame->area, target->frame->area,
316                                resist, w, h, dir))
317             break;
318     }
319     dock_get_area(&dock_area);
320     resist_size_window(c->frame->area, dock_area,
321                        resist, w, h, dir);
322 }
323
324 void resist_size_monitors(ObClient *c, gint resist, gint *w, gint *h,
325                           ObDirection dir)
326 {
327     gint l, t, r, b; /* my left, top, right and bottom sides */
328     gint dlt, drb; /* my destination left/top and right/bottom sides */
329     Rect *area, *parea;
330     gint al, at, ar, ab; /* screen boundaries */
331     gint pl, pt, pr, pb; /* physical screen boundaries */
332     guint i;
333     Rect desired_area;
334
335     if (!resist) return;
336
337     l = RECT_LEFT(c->frame->area);
338     r = RECT_RIGHT(c->frame->area);
339     t = RECT_TOP(c->frame->area);
340     b = RECT_BOTTOM(c->frame->area);
341
342     RECT_SET(desired_area, c->area.x, c->area.y, *w, *h);
343
344     for (i = 0; i < screen_num_monitors; ++i) {
345         parea = screen_physical_area_monitor(i);
346
347         if (!RECT_INTERSECTS_RECT(*parea, c->frame->area)) {
348             g_free(parea);
349             continue;
350         }
351
352         area = screen_area(c->desktop, SCREEN_AREA_ALL_MONITORS,
353                            &desired_area);
354
355         /* get the screen boundaries */
356         al = RECT_LEFT(*area);
357         at = RECT_TOP(*area);
358         ar = RECT_RIGHT(*area);
359         ab = RECT_BOTTOM(*area);
360         pl = RECT_LEFT(*parea);
361         pt = RECT_TOP(*parea);
362         pr = RECT_RIGHT(*parea);
363         pb = RECT_BOTTOM(*parea);
364
365         /* horizontal snapping */
366         switch (dir) {
367         case OB_DIRECTION_EAST:
368         case OB_DIRECTION_NORTHEAST:
369         case OB_DIRECTION_SOUTHEAST:
370         case OB_DIRECTION_NORTH:
371         case OB_DIRECTION_SOUTH:
372             dlt = l;
373             drb = r + *w - c->frame->area.width;
374             if (r <= ar && drb > ar && drb <= ar + resist)
375                 *w = ar - l + 1;
376             else if (r <= pr && drb > pr && drb <= pr + resist)
377                 *w = pr - l + 1;
378             break;
379         case OB_DIRECTION_WEST:
380         case OB_DIRECTION_NORTHWEST:
381         case OB_DIRECTION_SOUTHWEST:
382             dlt = l - *w + c->frame->area.width;
383             drb = r;
384             if (l >= al && dlt < al && dlt >= al - resist)
385                 *w = r - al + 1;
386             else if (l >= pl && dlt < pl && dlt >= pl - resist)
387                 *w = r - pl + 1;
388             break;
389         }
390
391         /* vertical snapping */
392         switch (dir) {
393         case OB_DIRECTION_SOUTH:
394         case OB_DIRECTION_SOUTHWEST:
395         case OB_DIRECTION_SOUTHEAST:
396         case OB_DIRECTION_WEST:
397         case OB_DIRECTION_EAST:
398             dlt = t;
399             drb = b + *h - c->frame->area.height;
400             if (b <= ab && drb > ab && drb <= ab + resist)
401                 *h = ab - t + 1;
402             else if (b <= pb && drb > pb && drb <= pb + resist)
403                 *h = pb - t + 1;
404             break;
405         case OB_DIRECTION_NORTH:
406         case OB_DIRECTION_NORTHWEST:
407         case OB_DIRECTION_NORTHEAST:
408             dlt = t - *h + c->frame->area.height;
409             drb = b;
410             if (t >= at && dlt < at && dlt >= at - resist)
411                 *h = b - at + 1;
412             else if (t >= pt && dlt < pt && dlt >= pt - resist)
413                 *h = b - pt + 1;
414             break;
415         }
416
417         g_free(area);
418         g_free(parea);
419     }
420 }