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