Dogcows Code - chaz/openbox/blob - plugins/resistance.c

   1 #include "../kernel/dispatch.h"
   2 #include "../kernel/client.h"
   3 #include "../kernel/frame.h"
   4 #include "../kernel/stacking.h"
   5 #include "../kernel/screen.h"
   6 #include "../kernel/config.h"
   7 #include <glib.h>
   8
   9 #define DEFAULT_RESISTANCE 10
  10
  11 void plugin_setup_config()
  12 {
  13     ConfigValue val;
  14
  15     config_def_set(config_def_new("resistance", Config_Integer,
  16                                   "Edge Resistance",
  17                                   "The amount of resistance to provide when "
  18                                   "moving windows past edges."
  19                                   "positioned."));
  20     config_def_set(config_def_new("resistance.windows", Config_Bool,
  21                                   "Edge Resistance On Windows",
  22                                   "Whether to provide edge resistance when "
  23                                   "moving windows past the edge of another "
  24                                   "window."));
  25     val.bool = TRUE;
  26     config_set("resistance.windows", Config_Bool, val);
  27 }
  28
  29 static void resist_move(Client *c, int *x, int *y)
  30 {
  31     GList *it;
  32     Rect *area;
  33     int l, t, r, b; /* requested edges */
  34     int al, at, ar, ab; /* screen area edges */
  35     int cl, ct, cr, cb; /* current edges */
  36     int w, h; /* current size */
  37     Client *snapx = NULL, *snapy = NULL;
  38     ConfigValue resist, window_resist;
  39
  40     if (!config_get("resistance", Config_Integer, &resist) ||
  41         resist.integer < 0) {
  42         resist.integer = DEFAULT_RESISTANCE;
  43         config_set("resistance", Config_Integer, resist);
  44     }
  45     if (!config_get("resistance.windows", Config_Bool, &window_resist))
  46         g_assert_not_reached();
  47
  48     w = c->frame->area.width;
  49     h = c->frame->area.height;
  50
  51     l = *x;
  52     t = *y;
  53     r = l + w - 1;
  54     b = t + h - 1;
  55
  56     cl = c->frame->area.x;
  57     ct = c->frame->area.y;
  58     cr = cl + c->frame->area.width - 1;
  59     cb = ct + c->frame->area.height - 1;
  60
  61     /* snap to other clients */
  62     if (window_resist.bool)
  63         for (it = stacking_list; it != NULL; it = it->next) {
  64             Client *target;
  65             int tl, tt, tr, tb; /* 1 past the target's edges on each side */
  66
  67             target = it->data;
  68             /* don't snap to self or non-visibles */
  69             if (!target->frame->visible || target == c) continue;
  70
  71             tl = target->frame->area.x - 1;
  72             tt = target->frame->area.y - 1;
  73             tr = tl + target->frame->area.width + 1;
  74             tb = tt + target->frame->area.height + 1;
  75
  76             /* snapx and snapy ensure that the window snaps to the top-most
  77                window edge available, without going all the way from
  78                bottom-to-top in the stacking list
  79             */
  80             if (snapx == NULL) {
  81                 if (cl >= tr && l < tr && l >= tr - resist.integer)
  82                     *x = tr, snapx = target;
  83                 else if (cr <= tl && r > tl && r <= tl + resist.integer)
  84                     *x = tl - w + 1, snapx = target;
  85                 if (snapx != NULL) {
  86                     /* try to corner snap to the window */
  87                     if (ct > tt && t <= tt && t > tt - resist.integer)
  88                         *y = tt + 1, snapy = target;
  89                     else if (cb < tb && b >= tb && b < tb + resist.integer)
  90                         *y = tb - h, snapy = target;
  91                 }
  92             }
  93             if (snapy == NULL) {
  94                 if (ct >= tb && t < tb && t >= tb - resist.integer)
  95                     *y = tb, snapy = target;
  96                 else if (!cb <= tt && b > tt && b <= tt + resist.integer)
  97                     *y = tt - h + 1, snapy = target;
  98                 if (snapy != NULL) {
  99                     /* try to corner snap to the window */
 100                     if (cl > tl && l <= tl && l > tl - resist.integer)
 101                         *x = tl + 1, snapx = target;
 102                     else if (cr < tr && r >= tr && r < tr + resist.integer)
 103                         *x = tr - w, snapx = target;
 104                 }
 105             }
 106
 107             if (snapx && snapy) break;
 108         }
 109
 110     /* get the screen boundaries */
 111     area = screen_area(c->desktop);
 112     al = area->x;
 113     at = area->y;
 114     ar = al + area->width - 1;
 115     ab = at + area->height - 1;
 116
 117     /* snap to screen edges */
 118     if (cl >= al && l < al && l >= al - resist.integer)
 119         *x = al;
 120     else if (cr <= ar && r > ar && r <= ar + resist.integer)
 121             *x = ar - w + 1;
 122     if (ct >= at && t < at && t >= at - resist.integer)
 123         *y = at;
 124     else if (cb <= ab && b > ab && b < ab + resist.integer)
 125         *y = ab - h + 1;
 126 }
 127
 128 static void resist_size(Client *c, int *w, int *h, Corner corn)
 129 {
 130     GList *it;
 131     Client *t; /* target */
 132     int lt, rb; /* my left/top and right/bottom sides */
 133     int dlt, drb; /* my destination left/top and right/bottom sides */
 134     int tlt, trb; /* target's left/top and right/bottom sides */
 135     Rect *area;
 136     int al, at, ar, ab; /* screen boundaries */
 137     Client *snapx = NULL, *snapy = NULL;
 138     ConfigValue resist, window_resist;
 139
 140     if (!config_get("resistance", Config_Integer, &resist) ||
 141         resist.integer < 0) {
 142         resist.integer = DEFAULT_RESISTANCE;
 143         config_set("resistance", Config_Integer, resist);
 144     }
 145     if (!config_get("resistance.windows", Config_Bool, &window_resist))
 146         g_assert_not_reached();
 147
 148     /* get the screen boundaries */
 149     area = screen_area(c->desktop);
 150     al = area->x;
 151     at = area->y;
 152     ar = al + area->width - 1;
 153     ab = at + area->height - 1;
 154
 155     /* horizontal snapping */
 156
 157     lt = c->frame->area.x;
 158     rb = lt + c->frame->area.width - 1;
 159
 160     /* snap to other windows */
 161     if (window_resist.bool) {
 162         for (it = stacking_list; !snapx && it != NULL; it = it->next) {
 163             t = it->data;
 164
 165             /* don't snap to invisibles or ourself */
 166             if (!t->frame->visible || t == c) continue;
 167
 168             switch (corn) {
 169             case Corner_TopLeft:
 170             case Corner_BottomLeft:
 171                 dlt = lt;
 172                 drb = rb + *w - c->frame->area.width;
 173                 tlt = t->frame->area.x;
 174                 if (rb < tlt && drb >= tlt && drb < tlt + resist.integer)
 175                     *w = tlt - lt, snapx = t;
 176                 break;
 177             case Corner_TopRight:
 178             case Corner_BottomRight:
 179                 dlt = lt - *w + c->frame->area.width;
 180                 drb = rb;
 181                 trb = t->frame->area.x + t->frame->area.width - 1;
 182                 if (lt > trb && dlt <= trb && dlt > trb - resist.integer)
 183                     *w = rb - trb, snapx = t;
 184                 break;
 185             }
 186         }
 187     }
 188
 189     /* snap to screen edges */
 190     switch (corn) {
 191     case Corner_TopLeft:
 192     case Corner_BottomLeft:
 193         dlt = lt;
 194         drb = rb + *w - c->frame->area.width;
 195         if (rb <= ar && drb > ar && drb <= ar + resist.integer)
 196             *w = ar - lt + 1;
 197         break;
 198     case Corner_TopRight:
 199     case Corner_BottomRight:
 200         dlt = lt - *w + c->frame->area.width;
 201         drb = rb;
 202         if (lt >= al && dlt < al && dlt >= al - resist.integer)
 203             *w = rb - al + 1;
 204         break;
 205     }
 206
 207     /* vertical snapping */
 208
 209     lt = c->frame->area.y;
 210     rb = lt + c->frame->area.height - 1;
 211
 212     /* snap to other windows */
 213     if (window_resist.bool) {
 214         for (it = stacking_list; !snapy && it != NULL; it = it->next) {
 215             t = it->data;
 216
 217             /* don't snap to invisibles or ourself */
 218             if (!t->frame->visible || t == c) continue;
 219
 220             switch (corn) {
 221             case Corner_TopLeft:
 222             case Corner_TopRight:
 223                 dlt = lt;
 224                 drb = rb + *h - c->frame->area.height;
 225                 tlt = t->frame->area.y;
 226                 if (rb < tlt && drb >= tlt && drb < tlt + resist.integer)
 227                     *h = tlt - lt, snapy = t;
 228                 break;
 229             case Corner_BottomLeft:
 230             case Corner_BottomRight:
 231                 dlt = lt - *h + c->frame->area.height;
 232                 drb = rb;
 233                 trb = t->frame->area.y + t->frame->area.height - 1;
 234                 if (lt > trb && dlt <= trb && dlt > trb - resist.integer)
 235                     *h = rb - trb, snapy = t;
 236                 break;
 237             }
 238         }
 239     }
 240
 241     /* snap to screen edges */
 242     switch (corn) {
 243     case Corner_TopLeft:
 244     case Corner_TopRight:
 245         dlt = lt;
 246         drb = rb + *h - c->frame->area.height;
 247         if (rb <= ab && drb > ab && drb <= ab + resist.integer)
 248             *h = ar - lt + 1;
 249         break;
 250     case Corner_BottomLeft:
 251     case Corner_BottomRight:
 252         dlt = lt - *h + c->frame->area.height;
 253         drb = rb;
 254         if (lt >= at && dlt < at && dlt >= at - resist.integer)
 255             *h = rb - al + 1;
 256         break;
 257     }
 258 }
 259
 260 static void event(ObEvent *e, void *foo)
 261 {
 262     if (e->type == Event_Client_Moving)
 263         resist_move(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1]);
 264     else if (e->type == Event_Client_Resizing)
 265         resist_size(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1],
 266                     e->data.c.num[2]);
 267 }
 268
 269 void plugin_startup()
 270 {
 271     dispatch_register(Event_Client_Moving | Event_Client_Resizing,
 272                       (EventHandler)event, NULL);
 273 }
 274
 275 void plugin_shutdown()
 276 {
 277     dispatch_register(0, (EventHandler)event, NULL);
 278 }