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 (ct < tb && cb > tt) {
  82                     if (cl >= tr && l < tr && l >= tr - resist.integer)
  83                         *x = tr, snapx = target;
  84                     else if (cr <= tl && r > tl && r <= tl + resist.integer)
  85                         *x = tl - w + 1, snapx = target;
  86                     if (snapx != NULL) {
  87                         /* try to corner snap to the window */
  88                         if (ct > tt && t <= tt && t > tt - resist.integer)
  89                             *y = tt + 1, snapy = target;
  90                         else if (cb < tb && b >= tb && b < tb + resist.integer)
  91                             *y = tb - h, snapy = target;
  92                     }
  93                 }
  94             }
  95             if (snapy == NULL) {
  96                 if (cl < tr && cr > tl) {
  97                     if (ct >= tb && t < tb && t >= tb - resist.integer)
  98                         *y = tb, snapy = target;
  99                     else if (cb <= tt && b > tt && b <= tt + resist.integer)
 100                         *y = tt - h + 1, snapy = target;
 101                     if (snapy != NULL) {
 102                         /* try to corner snap to the window */
 103                         if (cl > tl && l <= tl && l > tl - resist.integer)
 104                             *x = tl + 1, snapx = target;
 105                         else if (cr < tr && r >= tr && r < tr + resist.integer)
 106                             *x = tr - w, snapx = target;
 107                     }
 108                 }
 109             }
 110
 111             if (snapx && snapy) break;
 112         }
 113
 114     /* get the screen boundaries */
 115     area = screen_area(c->desktop);
 116     al = area->x;
 117     at = area->y;
 118     ar = al + area->width - 1;
 119     ab = at + area->height - 1;
 120
 121     /* snap to screen edges */
 122     if (cl >= al && l < al && l >= al - resist.integer)
 123         *x = al;
 124     else if (cr <= ar && r > ar && r <= ar + resist.integer)
 125             *x = ar - w + 1;
 126     if (ct >= at && t < at && t >= at - resist.integer)
 127         *y = at;
 128     else if (cb <= ab && b > ab && b < ab + resist.integer)
 129         *y = ab - h + 1;
 130 }
 131
 132 static void resist_size(Client *c, int *w, int *h, Corner corn)
 133 {
 134     GList *it;
 135     Client *target; /* target */
 136     int l, t, r, b; /* my left, top, right and bottom sides */
 137     int dlt, drb; /* my destination left/top and right/bottom sides */
 138     int tl, tt, tr, tb; /* target's left, top, right and bottom bottom sides */
 139     Rect *area;
 140     int al, at, ar, ab; /* screen boundaries */
 141     Client *snapx = NULL, *snapy = NULL;
 142     ConfigValue resist, window_resist;
 143
 144     if (!config_get("resistance", Config_Integer, &resist) ||
 145         resist.integer < 0) {
 146         resist.integer = DEFAULT_RESISTANCE;
 147         config_set("resistance", Config_Integer, resist);
 148     }
 149     if (!config_get("resistance.windows", Config_Bool, &window_resist))
 150         g_assert_not_reached();
 151
 152     l = c->frame->area.x;
 153     r = l + c->frame->area.width - 1;
 154     t = c->frame->area.y;
 155     b = t + c->frame->area.height - 1;
 156
 157     /* get the screen boundaries */
 158     area = screen_area(c->desktop);
 159     al = area->x;
 160     at = area->y;
 161     ar = al + area->width - 1;
 162     ab = at + area->height - 1;
 163
 164     /* snap to other windows */
 165     if (window_resist.bool) {
 166         for (it = stacking_list; it != NULL; it = it->next) {
 167             target = it->data;
 168
 169             /* don't snap to invisibles or ourself */
 170             if (!target->frame->visible || target == c) continue;
 171
 172             tl = target->frame->area.x;
 173             tr = target->frame->area.x + target->frame->area.width - 1;
 174             tt = target->frame->area.y;
 175             tb = target->frame->area.y + target->frame->area.height - 1;
 176
 177             if (snapx == NULL) {
 178                 /* horizontal snapping */
 179                 if (t < tb && b > tt) {
 180                     switch (corn) {
 181                     case Corner_TopLeft:
 182                     case Corner_BottomLeft:
 183                         dlt = l;
 184                         drb = r + *w - c->frame->area.width;
 185                         if (r < tl && drb >= tl && drb < tl + resist.integer)
 186                             *w = tl - l, snapx = target;
 187                         break;
 188                     case Corner_TopRight:
 189                     case Corner_BottomRight:
 190                         dlt = l - *w + c->frame->area.width;
 191                         drb = r;
 192                         if (l > tr && dlt <= tr && dlt > tr - resist.integer)
 193                             *w = r - tr, snapx = target;
 194                         break;
 195                     }
 196                 }
 197             }
 198
 199             if (snapy == NULL) {
 200                 /* vertical snapping */
 201                 if (l < tr && r > tl) {
 202                     switch (corn) {
 203                     case Corner_TopLeft:
 204                     case Corner_TopRight:
 205                         dlt = t;
 206                         drb = b + *h - c->frame->area.height;
 207                         if (b < tt && drb >= tt && drb < tt + resist.integer)
 208                             *h = tt - t, snapy = target;
 209                         break;
 210                     case Corner_BottomLeft:
 211                     case Corner_BottomRight:
 212                         dlt = t - *h + c->frame->area.height;
 213                         drb = b;
 214                         if (t > tb && dlt <= tb && dlt > tb - resist.integer)
 215                             *h = b - tb, snapy = target;
 216                         break;
 217                     }
 218                 }
 219             }
 220
 221             /* snapped both ways */
 222             if (snapx && snapy) break;
 223         }
 224     }
 225
 226     /* snap to screen edges */
 227
 228     /* horizontal snapping */
 229     switch (corn) {
 230     case Corner_TopLeft:
 231     case Corner_BottomLeft:
 232         dlt = l;
 233         drb = r + *w - c->frame->area.width;
 234         if (r <= ar && drb > ar && drb <= ar + resist.integer)
 235             *w = ar - l + 1;
 236         break;
 237     case Corner_TopRight:
 238     case Corner_BottomRight:
 239         dlt = l - *w + c->frame->area.width;
 240         drb = r;
 241         if (l >= al && dlt < al && dlt >= al - resist.integer)
 242             *w = r - al + 1;
 243         break;
 244     }
 245
 246     /* vertical snapping */
 247     switch (corn) {
 248     case Corner_TopLeft:
 249     case Corner_TopRight:
 250         dlt = t;
 251         drb = b + *h - c->frame->area.height;
 252         if (b <= ab && drb > ab && drb <= ab + resist.integer)
 253             *h = ab - t + 1;
 254         break;
 255     case Corner_BottomLeft:
 256     case Corner_BottomRight:
 257         dlt = t - *h + c->frame->area.height;
 258         drb = b;
 259         if (t >= at && dlt < at && dlt >= at - resist.integer)
 260             *h = b - at + 1;
 261         break;
 262     }
 263
 264     /* round down for size increments */
 265     *w -= c->frame->area.width + c->frame->size.left + c->frame->size.right;
 266     *w = *w / c->size_inc.width * c->size_inc.width;
 267     *w += c->frame->area.width + c->frame->size.left + c->frame->size.right;
 268
 269     *h -= c->frame->area.height + c->frame->size.top + c->frame->size.bottom;
 270     *h = *h / c->size_inc.height * c->size_inc.height;
 271     *h += c->frame->area.height + c->frame->size.top + c->frame->size.bottom;
 272 }
 273
 274 static void event(ObEvent *e, void *foo)
 275 {
 276     if (e->type == Event_Client_Moving)
 277         resist_move(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1]);
 278     else if (e->type == Event_Client_Resizing)
 279         resist_size(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1],
 280                     e->data.c.num[2]);
 281 }
 282
 283 void plugin_startup()
 284 {
 285     dispatch_register(Event_Client_Moving | Event_Client_Resizing,
 286                       (EventHandler)event, NULL);
 287 }
 288
 289 void plugin_shutdown()
 290 {
 291     dispatch_register(0, (EventHandler)event, NULL);
 292 }