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/parse.h"
   5 #include "kernel/stacking.h"
   6 #include "kernel/screen.h"
   7 #include <glib.h>
   8
   9 static int resistance;
  10 static gboolean resist_windows;
  11
  12 static void parse_assign(char *name, ParseToken *value)
  13 {
  14     if (!g_ascii_strcasecmp(name, "strength")) {
  15         if (value->type != TOKEN_INTEGER)
  16             yyerror("invalid value");
  17         else {
  18             if (value->data.integer >= 0)
  19                 resistance = value->data.integer;
  20         }
  21     } else if  (!g_ascii_strcasecmp(name, "windows")) {
  22         if (value->type != TOKEN_BOOL)
  23             yyerror("invalid value");
  24         else
  25             resist_windows = value->data.bool;
  26     } else
  27         yyerror("invalid option");
  28     parse_free_token(value);
  29 }
  30
  31 void plugin_setup_config()
  32 {
  33     resistance = 10;
  34     resist_windows = TRUE;
  35
  36     parse_reg_section("resistance", NULL, parse_assign);
  37 }
  38
  39 static void resist_move(Client *c, int *x, int *y)
  40 {
  41     GList *it;
  42     Rect *area;
  43     int l, t, r, b; /* requested edges */
  44     int al, at, ar, ab; /* screen area edges */
  45     int cl, ct, cr, cb; /* current edges */
  46     int w, h; /* current size */
  47     Client *snapx = NULL, *snapy = NULL;
  48
  49     w = c->frame->area.width;
  50     h = c->frame->area.height;
  51
  52     l = *x;
  53     t = *y;
  54     r = l + w - 1;
  55     b = t + h - 1;
  56
  57     cl = c->frame->area.x;
  58     ct = c->frame->area.y;
  59     cr = cl + c->frame->area.width - 1;
  60     cb = ct + c->frame->area.height - 1;
  61
  62     /* snap to other clients */
  63     if (resist_windows)
  64         for (it = stacking_list; it != NULL; it = it->next) {
  65             Client *target;
  66             int tl, tt, tr, tb; /* 1 past the target's edges on each side */
  67
  68             if (!WINDOW_IS_CLIENT(it->data))
  69                 continue;
  70             target = it->data;
  71             /* don't snap to self or non-visibles */
  72             if (!target->frame->visible || target == c) continue;
  73
  74             tl = target->frame->area.x - 1;
  75             tt = target->frame->area.y - 1;
  76             tr = tl + target->frame->area.width + 1;
  77             tb = tt + target->frame->area.height + 1;
  78
  79             /* snapx and snapy ensure that the window snaps to the top-most
  80                window edge available, without going all the way from
  81                bottom-to-top in the stacking list
  82             */
  83             if (snapx == NULL) {
  84                 if (ct < tb && cb > tt) {
  85                     if (cl >= tr && l < tr && l >= tr - resistance)
  86                         *x = tr, snapx = target;
  87                     else if (cr <= tl && r > tl && r <= tl + resistance)
  88                         *x = tl - w + 1, snapx = target;
  89                     if (snapx != NULL) {
  90                         /* try to corner snap to the window */
  91                         if (ct > tt && t <= tt && t > tt - resistance)
  92                             *y = tt + 1, snapy = target;
  93                         else if (cb < tb && b >= tb && b < tb + resistance)
  94                             *y = tb - h, snapy = target;
  95                     }
  96                 }
  97             }
  98             if (snapy == NULL) {
  99                 if (cl < tr && cr > tl) {
 100                     if (ct >= tb && t < tb && t >= tb - resistance)
 101                         *y = tb, snapy = target;
 102                     else if (cb <= tt && b > tt && b <= tt + resistance)
 103                         *y = tt - h + 1, snapy = target;
 104                     if (snapy != NULL) {
 105                         /* try to corner snap to the window */
 106                         if (cl > tl && l <= tl && l > tl - resistance)
 107                             *x = tl + 1, snapx = target;
 108                         else if (cr < tr && r >= tr && r < tr + resistance)
 109                             *x = tr - w, snapx = target;
 110                     }
 111                 }
 112             }
 113
 114             if (snapx && snapy) break;
 115         }
 116
 117     /* get the screen boundaries */
 118     area = screen_area(c->desktop);
 119     al = area->x;
 120     at = area->y;
 121     ar = al + area->width - 1;
 122     ab = at + area->height - 1;
 123
 124     /* snap to screen edges */
 125     if (cl >= al && l < al && l >= al - resistance)
 126         *x = al;
 127     else if (cr <= ar && r > ar && r <= ar + resistance)
 128             *x = ar - w + 1;
 129     if (ct >= at && t < at && t >= at - resistance)
 130         *y = at;
 131     else if (cb <= ab && b > ab && b < ab + resistance)
 132         *y = ab - h + 1;
 133 }
 134
 135 static void resist_size(Client *c, int *w, int *h, Corner corn)
 136 {
 137     GList *it;
 138     Client *target; /* target */
 139     int l, t, r, b; /* my left, top, right and bottom sides */
 140     int dlt, drb; /* my destination left/top and right/bottom sides */
 141     int tl, tt, tr, tb; /* target's left, top, right and bottom bottom sides */
 142     Rect *area;
 143     int al, at, ar, ab; /* screen boundaries */
 144     Client *snapx = NULL, *snapy = NULL;
 145
 146     /* don't snap windows with size increments */
 147     if (c->size_inc.width > 1 || c->size_inc.height > 1)
 148         return;
 149
 150     l = c->frame->area.x;
 151     r = l + c->frame->area.width - 1;
 152     t = c->frame->area.y;
 153     b = t + c->frame->area.height - 1;
 154
 155     /* get the screen boundaries */
 156     area = screen_area(c->desktop);
 157     al = area->x;
 158     at = area->y;
 159     ar = al + area->width - 1;
 160     ab = at + area->height - 1;
 161
 162     /* snap to other windows */
 163     if (resist_windows) {
 164         for (it = stacking_list; it != NULL; it = it->next) {
 165             target = it->data;
 166
 167             /* don't snap to invisibles or ourself */
 168             if (!target->frame->visible || target == c) continue;
 169
 170             tl = target->frame->area.x;
 171             tr = target->frame->area.x + target->frame->area.width - 1;
 172             tt = target->frame->area.y;
 173             tb = target->frame->area.y + target->frame->area.height - 1;
 174
 175             if (snapx == NULL) {
 176                 /* horizontal snapping */
 177                 if (t < tb && b > tt) {
 178                     switch (corn) {
 179                     case Corner_TopLeft:
 180                     case Corner_BottomLeft:
 181                         dlt = l;
 182                         drb = r + *w - c->frame->area.width;
 183                         if (r < tl && drb >= tl && drb < tl + resistance)
 184                             *w = tl - l, snapx = target;
 185                         break;
 186                     case Corner_TopRight:
 187                     case Corner_BottomRight:
 188                         dlt = l - *w + c->frame->area.width;
 189                         drb = r;
 190                         if (l > tr && dlt <= tr && dlt > tr - resistance)
 191                             *w = r - tr, snapx = target;
 192                         break;
 193                     }
 194                 }
 195             }
 196
 197             if (snapy == NULL) {
 198                 /* vertical snapping */
 199                 if (l < tr && r > tl) {
 200                     switch (corn) {
 201                     case Corner_TopLeft:
 202                     case Corner_TopRight:
 203                         dlt = t;
 204                         drb = b + *h - c->frame->area.height;
 205                         if (b < tt && drb >= tt && drb < tt + resistance)
 206                             *h = tt - t, snapy = target;
 207                         break;
 208                     case Corner_BottomLeft:
 209                     case Corner_BottomRight:
 210                         dlt = t - *h + c->frame->area.height;
 211                         drb = b;
 212                         if (t > tb && dlt <= tb && dlt > tb - resistance)
 213                             *h = b - tb, snapy = target;
 214                         break;
 215                     }
 216                 }
 217             }
 218
 219             /* snapped both ways */
 220             if (snapx && snapy) break;
 221         }
 222     }
 223
 224     /* snap to screen edges */
 225
 226     /* horizontal snapping */
 227     switch (corn) {
 228     case Corner_TopLeft:
 229     case Corner_BottomLeft:
 230         dlt = l;
 231         drb = r + *w - c->frame->area.width;
 232         if (r <= ar && drb > ar && drb <= ar + resistance)
 233             *w = ar - l + 1;
 234         break;
 235     case Corner_TopRight:
 236     case Corner_BottomRight:
 237         dlt = l - *w + c->frame->area.width;
 238         drb = r;
 239         if (l >= al && dlt < al && dlt >= al - resistance)
 240             *w = r - al + 1;
 241         break;
 242     }
 243
 244     /* vertical snapping */
 245     switch (corn) {
 246     case Corner_TopLeft:
 247     case Corner_TopRight:
 248         dlt = t;
 249         drb = b + *h - c->frame->area.height;
 250         if (b <= ab && drb > ab && drb <= ab + resistance)
 251             *h = ab - t + 1;
 252         break;
 253     case Corner_BottomLeft:
 254     case Corner_BottomRight:
 255         dlt = t - *h + c->frame->area.height;
 256         drb = b;
 257         if (t >= at && dlt < at && dlt >= at - resistance)
 258             *h = b - at + 1;
 259         break;
 260     }
 261 }
 262
 263 static void event(ObEvent *e, void *foo)
 264 {
 265     if (e->type == Event_Client_Moving)
 266         resist_move(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1]);
 267     else if (e->type == Event_Client_Resizing)
 268         resist_size(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1],
 269                     e->data.c.num[2]);
 270 }
 271
 272 void plugin_startup()
 273 {
 274     dispatch_register(Event_Client_Moving | Event_Client_Resizing,
 275                       (EventHandler)event, NULL);
 276 }
 277
 278 void plugin_shutdown()
 279 {
 280     dispatch_register(0, (EventHandler)event, NULL);
 281 }