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