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     Rect expand;
 107
 108     if (!resist) return;
 109
 110     frame_client_gravity(c->frame, x, y);
 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
 123         /* check window boundary as it is */
 124         if (resist_move_window(c->frame->area, target->frame->area,
 125                                resist, x, y))
 126             break;
 127
 128         /* now check window with the expanded margin area */
 129         if (config_window_margin == 0)
 130             continue;
 131
 132         RECT_SET(expand, target->frame->area.x - config_window_margin,
 133                          target->frame->area.y - config_window_margin,
 134                          target->frame->area.width + 2 * config_window_margin,
 135                          target->frame->area.height + 2 * config_window_margin);
 136
 137         if (resist_move_window(c->frame->area, expand,
 138                                resist, x, y))
 139             break;
 140     }
 141     dock_get_area(&dock_area);
 142     resist_move_window(c->frame->area, dock_area, resist, x, y);
 143
 144     frame_frame_gravity(c->frame, x, y);
 145 }
 146
 147 void resist_move_monitors(ObClient *c, gint resist, gint *x, gint *y)
 148 {
 149     Rect *area, *parea;
 150     guint i;
 151     gint l, t, r, b; /* requested edges */
 152     gint al, at, ar, ab; /* screen area edges */
 153     gint pl, pt, pr, pb; /* physical screen area edges */
 154     gint cl, ct, cr, cb; /* current edges */
 155     gint w, h; /* current size */
 156     Rect desired_area;
 157
 158     if (!resist) return;
 159
 160     frame_client_gravity(c->frame, x, y);
 161
 162     w = c->frame->area.width;
 163     h = c->frame->area.height;
 164
 165     l = *x;
 166     t = *y;
 167     r = l + w - 1;
 168     b = t + h - 1;
 169
 170     cl = RECT_LEFT(c->frame->area);
 171     ct = RECT_TOP(c->frame->area);
 172     cr = RECT_RIGHT(c->frame->area);
 173     cb = RECT_BOTTOM(c->frame->area);
 174
 175     RECT_SET(desired_area, *x, *y, c->area.width, c->area.height);
 176
 177     for (i = 0; i < screen_num_monitors; ++i) {
 178         parea = screen_physical_area_monitor(i);
 179
 180         if (!RECT_INTERSECTS_RECT(*parea, c->frame->area)) {
 181             g_free(parea);
 182             continue;
 183         }
 184
 185         area = screen_area(c->desktop, SCREEN_AREA_ALL_MONITORS,
 186                            &desired_area);
 187
 188         al = RECT_LEFT(*area);
 189         at = RECT_TOP(*area);
 190         ar = RECT_RIGHT(*area);
 191         ab = RECT_BOTTOM(*area);
 192         pl = RECT_LEFT(*parea);
 193         pt = RECT_TOP(*parea);
 194         pr = RECT_RIGHT(*parea);
 195         pb = RECT_BOTTOM(*parea);
 196
 197         if (cl >= al && l < al && l >= al - resist)
 198             *x = al;
 199         else if (cr <= ar && r > ar && r <= ar + resist)
 200             *x = ar - w + 1;
 201         else if (cl >= pl && l < pl && l >= pl - resist)
 202             *x = pl;
 203         else if (cr <= pr && r > pr && r <= pr + resist)
 204             *x = pr - w + 1;
 205
 206         if (ct >= at && t < at && t >= at - resist)
 207             *y = at;
 208         else if (cb <= ab && b > ab && b < ab + resist)
 209             *y = ab - h + 1;
 210         else if (ct >= pt && t < pt && t >= pt - resist)
 211             *y = pt;
 212         else if (cb <= pb && b > pb && b < pb + resist)
 213             *y = pb - h + 1;
 214
 215         g_free(area);
 216         g_free(parea);
 217     }
 218
 219     frame_frame_gravity(c->frame, x, y);
 220 }
 221
 222 static gboolean resist_size_window(Rect window, Rect target, gint resist,
 223                                    gint *w, gint *h, ObDirection dir)
 224 {
 225     gint l, t, r, b; /* my left, top, right and bottom sides */
 226     gint tl, tt, tr, tb; /* target's left, top, right and bottom bottom sides*/
 227     gint dlt, drb; /* my destination left/top and right/bottom sides */
 228     gboolean snapx = 0, snapy = 0;
 229     gint orgw, orgh;
 230
 231     l = RECT_LEFT(window);
 232     t = RECT_TOP(window);
 233     r = RECT_RIGHT(window);
 234     b = RECT_BOTTOM(window);
 235
 236     orgw = window.width;
 237     orgh = window.height;
 238
 239     tl = RECT_LEFT(target);
 240     tt = RECT_TOP(target);
 241     tr = RECT_RIGHT(target);
 242     tb = RECT_BOTTOM(target);
 243
 244     if (!snapx) {
 245         /* horizontal snapping */
 246         if (t < tb && b > tt) {
 247             switch (dir) {
 248             case OB_DIRECTION_EAST:
 249             case OB_DIRECTION_NORTHEAST:
 250             case OB_DIRECTION_SOUTHEAST:
 251             case OB_DIRECTION_NORTH:
 252             case OB_DIRECTION_SOUTH:
 253                 dlt = l;
 254                 drb = r + *w - orgw;
 255                 if (r < tl && drb >= tl &&
 256                     drb < tl + resist)
 257                     *w = tl - l, snapx = TRUE;
 258                 break;
 259             case OB_DIRECTION_WEST:
 260             case OB_DIRECTION_NORTHWEST:
 261             case OB_DIRECTION_SOUTHWEST:
 262                 dlt = l - *w + orgw;
 263                 drb = r;
 264                 if (l > tr && dlt <= tr &&
 265                     dlt > tr - resist)
 266                     *w = r - tr, snapx = TRUE;
 267                 break;
 268             }
 269         }
 270     }
 271
 272     if (!snapy) {
 273         /* vertical snapping */
 274         if (l < tr && r > tl) {
 275             switch (dir) {
 276             case OB_DIRECTION_SOUTH:
 277             case OB_DIRECTION_SOUTHWEST:
 278             case OB_DIRECTION_SOUTHEAST:
 279             case OB_DIRECTION_EAST:
 280             case OB_DIRECTION_WEST:
 281                 dlt = t;
 282                 drb = b + *h - orgh;
 283                 if (b < tt && drb >= tt &&
 284                     drb < tt + resist)
 285                     *h = tt - t, snapy = TRUE;
 286                 break;
 287             case OB_DIRECTION_NORTH:
 288             case OB_DIRECTION_NORTHWEST:
 289             case OB_DIRECTION_NORTHEAST:
 290                 dlt = t - *h + orgh;
 291                 drb = b;
 292                 if (t > tb && dlt <= tb &&
 293                     dlt > tb - resist)
 294                     *h = b - tb, snapy = TRUE;
 295                 break;
 296             }
 297         }
 298     }
 299
 300     /* snapped both ways */
 301     return snapx && snapy;
 302 }
 303
 304 void resist_size_windows(ObClient *c, gint resist, gint *w, gint *h,
 305                          ObDirection dir)
 306 {
 307     GList *it;
 308     ObClient *target; /* target */
 309     Rect dock_area;
 310     Rect expand;
 311
 312     if (!resist) return;
 313
 314     for (it = stacking_list; it; it = g_list_next(it)) {
 315         if (!WINDOW_IS_CLIENT(it->data))
 316             continue;
 317         target = it->data;
 318
 319         /* don't snap to invisibles or ourself */
 320         if (!target->frame->visible || target == c)
 321             continue;
 322
 323         /* check window boundary as it is */
 324         if (resist_size_window(c->frame->area, target->frame->area,
 325                                resist, w, h, dir))
 326             break;
 327
 328         /* now check window with the expanded margin area */
 329         if (config_window_margin == 0)
 330             continue;
 331
 332         RECT_SET(expand, target->frame->area.x - config_window_margin,
 333                          target->frame->area.y - config_window_margin,
 334                          target->frame->area.width + 2 * config_window_margin,
 335                          target->frame->area.height + 2 * config_window_margin);
 336
 337         if (resist_size_window(c->frame->area, expand,
 338                                resist, w, h, dir))
 339             break;
 340     }
 341     dock_get_area(&dock_area);
 342     resist_size_window(c->frame->area, dock_area,
 343                        resist, w, h, dir);
 344 }
 345
 346 void resist_size_monitors(ObClient *c, gint resist, gint *w, gint *h,
 347                           ObDirection dir)
 348 {
 349     gint l, t, r, b; /* my left, top, right and bottom sides */
 350     gint dlt, drb; /* my destination left/top and right/bottom sides */
 351     Rect *area, *parea;
 352     gint al, at, ar, ab; /* screen boundaries */
 353     gint pl, pt, pr, pb; /* physical screen boundaries */
 354     gint incw, inch;
 355     guint i;
 356     Rect desired_area;
 357
 358     if (!resist) return;
 359
 360     l = RECT_LEFT(c->frame->area);
 361     r = RECT_RIGHT(c->frame->area);
 362     t = RECT_TOP(c->frame->area);
 363     b = RECT_BOTTOM(c->frame->area);
 364
 365     incw = c->size_inc.width;
 366     inch = c->size_inc.height;
 367
 368     RECT_SET(desired_area, c->area.x, c->area.y, *w, *h);
 369
 370     for (i = 0; i < screen_num_monitors; ++i) {
 371         parea = screen_physical_area_monitor(i);
 372
 373         if (!RECT_INTERSECTS_RECT(*parea, c->frame->area)) {
 374             g_free(parea);
 375             continue;
 376         }
 377
 378         area = screen_area(c->desktop, SCREEN_AREA_ALL_MONITORS,
 379                            &desired_area);
 380
 381         /* get the screen boundaries */
 382         al = RECT_LEFT(*area);
 383         at = RECT_TOP(*area);
 384         ar = RECT_RIGHT(*area);
 385         ab = RECT_BOTTOM(*area);
 386         pl = RECT_LEFT(*parea);
 387         pt = RECT_TOP(*parea);
 388         pr = RECT_RIGHT(*parea);
 389         pb = RECT_BOTTOM(*parea);
 390
 391         /* horizontal snapping */
 392         switch (dir) {
 393         case OB_DIRECTION_EAST:
 394         case OB_DIRECTION_NORTHEAST:
 395         case OB_DIRECTION_SOUTHEAST:
 396         case OB_DIRECTION_NORTH:
 397         case OB_DIRECTION_SOUTH:
 398             dlt = l;
 399             drb = r + *w - c->frame->area.width;
 400             if (r <= ar && drb > ar && drb <= ar + resist)
 401                 *w = ar - l + 1;
 402             else if (r <= pr && drb > pr && drb <= pr + resist)
 403                 *w = pr - l + 1;
 404             break;
 405         case OB_DIRECTION_WEST:
 406         case OB_DIRECTION_NORTHWEST:
 407         case OB_DIRECTION_SOUTHWEST:
 408             dlt = l - *w + c->frame->area.width;
 409             drb = r;
 410             if (l >= al && dlt < al && dlt >= al - resist)
 411                 *w = r - al + 1;
 412             else if (l >= pl && dlt < pl && dlt >= pl - resist)
 413                 *w = r - pl + 1;
 414             break;
 415         }
 416
 417         /* vertical snapping */
 418         switch (dir) {
 419         case OB_DIRECTION_SOUTH:
 420         case OB_DIRECTION_SOUTHWEST:
 421         case OB_DIRECTION_SOUTHEAST:
 422         case OB_DIRECTION_WEST:
 423         case OB_DIRECTION_EAST:
 424             dlt = t;
 425             drb = b + *h - c->frame->area.height;
 426             if (b <= ab && drb > ab && drb <= ab + resist)
 427                 *h = ab - t + 1;
 428             else if (b <= pb && drb > pb && drb <= pb + resist)
 429                 *h = pb - t + 1;
 430             break;
 431         case OB_DIRECTION_NORTH:
 432         case OB_DIRECTION_NORTHWEST:
 433         case OB_DIRECTION_NORTHEAST:
 434             dlt = t - *h + c->frame->area.height;
 435             drb = b;
 436             if (t >= at && dlt < at && dlt >= at - resist)
 437                 *h = b - at + 1;
 438             else if (t >= pt && dlt < pt && dlt >= pt - resist)
 439                 *h = b - pt + 1;
 440             break;
 441         }
 442
 443         g_free(area);
 444         g_free(parea);
 445     }
 446 }