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             target = it->data;
  69             /* don't snap to self or non-visibles */
  70             if (!target->frame->visible || target == c) continue;
  71
  72             tl = target->frame->area.x - 1;
  73             tt = target->frame->area.y - 1;
  74             tr = tl + target->frame->area.width + 1;
  75             tb = tt + target->frame->area.height + 1;
  76
  77             /* snapx and snapy ensure that the window snaps to the top-most
  78                window edge available, without going all the way from
  79                bottom-to-top in the stacking list
  80             */
  81             if (snapx == NULL) {
  82                 if (ct < tb && cb > tt) {
  83                     if (cl >= tr && l < tr && l >= tr - resistance)
  84                         *x = tr, snapx = target;
  85                     else if (cr <= tl && r > tl && r <= tl + resistance)
  86                         *x = tl - w + 1, snapx = target;
  87                     if (snapx != NULL) {
  88                         /* try to corner snap to the window */
  89                         if (ct > tt && t <= tt && t > tt - resistance)
  90                             *y = tt + 1, snapy = target;
  91                         else if (cb < tb && b >= tb && b < tb + resistance)
  92                             *y = tb - h, snapy = target;
  93                     }
  94                 }
  95             }
  96             if (snapy == NULL) {
  97                 if (cl < tr && cr > tl) {
  98                     if (ct >= tb && t < tb && t >= tb - resistance)
  99                         *y = tb, snapy = target;
 100                     else if (cb <= tt && b > tt && b <= tt + resistance)
 101                         *y = tt - h + 1, snapy = target;
 102                     if (snapy != NULL) {
 103                         /* try to corner snap to the window */
 104                         if (cl > tl && l <= tl && l > tl - resistance)
 105                             *x = tl + 1, snapx = target;
 106                         else if (cr < tr && r >= tr && r < tr + resistance)
 107                             *x = tr - w, snapx = target;
 108                     }
 109                 }
 110             }
 111
 112             if (snapx && snapy) break;
 113         }
 114
 115     /* get the screen boundaries */
 116     area = screen_area(c->desktop);
 117     al = area->x;
 118     at = area->y;
 119     ar = al + area->width - 1;
 120     ab = at + area->height - 1;
 121
 122     /* snap to screen edges */
 123     if (cl >= al && l < al && l >= al - resistance)
 124         *x = al;
 125     else if (cr <= ar && r > ar && r <= ar + resistance)
 126             *x = ar - w + 1;
 127     if (ct >= at && t < at && t >= at - resistance)
 128         *y = at;
 129     else if (cb <= ab && b > ab && b < ab + resistance)
 130         *y = ab - h + 1;
 131 }
 132
 133 static void resist_size(Client *c, int *w, int *h, Corner corn)
 134 {
 135     GList *it;
 136     Client *target; /* target */
 137     int l, t, r, b; /* my left, top, right and bottom sides */
 138     int dlt, drb; /* my destination left/top and right/bottom sides */
 139     int tl, tt, tr, tb; /* target's left, top, right and bottom bottom sides */
 140     Rect *area;
 141     int al, at, ar, ab; /* screen boundaries */
 142     Client *snapx = NULL, *snapy = NULL;
 143
 144     /* don't snap windows with size increments */
 145     if (c->size_inc.width > 1 || c->size_inc.height > 1)
 146         return;
 147
 148     l = c->frame->area.x;
 149     r = l + c->frame->area.width - 1;
 150     t = c->frame->area.y;
 151     b = t + c->frame->area.height - 1;
 152
 153     /* get the screen boundaries */
 154     area = screen_area(c->desktop);
 155     al = area->x;
 156     at = area->y;
 157     ar = al + area->width - 1;
 158     ab = at + area->height - 1;
 159
 160     /* snap to other windows */
 161     if (resist_windows) {
 162         for (it = stacking_list; it != NULL; it = it->next) {
 163             target = it->data;
 164
 165             /* don't snap to invisibles or ourself */
 166             if (!target->frame->visible || target == c) continue;
 167
 168             tl = target->frame->area.x;
 169             tr = target->frame->area.x + target->frame->area.width - 1;
 170             tt = target->frame->area.y;
 171             tb = target->frame->area.y + target->frame->area.height - 1;
 172
 173             if (snapx == NULL) {
 174                 /* horizontal snapping */
 175                 if (t < tb && b > tt) {
 176                     switch (corn) {
 177                     case Corner_TopLeft:
 178                     case Corner_BottomLeft:
 179                         dlt = l;
 180                         drb = r + *w - c->frame->area.width;
 181                         if (r < tl && drb >= tl && drb < tl + resistance)
 182                             *w = tl - l, snapx = target;
 183                         break;
 184                     case Corner_TopRight:
 185                     case Corner_BottomRight:
 186                         dlt = l - *w + c->frame->area.width;
 187                         drb = r;
 188                         if (l > tr && dlt <= tr && dlt > tr - resistance)
 189                             *w = r - tr, snapx = target;
 190                         break;
 191                     }
 192                 }
 193             }
 194
 195             if (snapy == NULL) {
 196                 /* vertical snapping */
 197                 if (l < tr && r > tl) {
 198                     switch (corn) {
 199                     case Corner_TopLeft:
 200                     case Corner_TopRight:
 201                         dlt = t;
 202                         drb = b + *h - c->frame->area.height;
 203                         if (b < tt && drb >= tt && drb < tt + resistance)
 204                             *h = tt - t, snapy = target;
 205                         break;
 206                     case Corner_BottomLeft:
 207                     case Corner_BottomRight:
 208                         dlt = t - *h + c->frame->area.height;
 209                         drb = b;
 210                         if (t > tb && dlt <= tb && dlt > tb - resistance)
 211                             *h = b - tb, snapy = target;
 212                         break;
 213                     }
 214                 }
 215             }
 216
 217             /* snapped both ways */
 218             if (snapx && snapy) break;
 219         }
 220     }
 221
 222     /* snap to screen edges */
 223
 224     /* horizontal snapping */
 225     switch (corn) {
 226     case Corner_TopLeft:
 227     case Corner_BottomLeft:
 228         dlt = l;
 229         drb = r + *w - c->frame->area.width;
 230         if (r <= ar && drb > ar && drb <= ar + resistance)
 231             *w = ar - l + 1;
 232         break;
 233     case Corner_TopRight:
 234     case Corner_BottomRight:
 235         dlt = l - *w + c->frame->area.width;
 236         drb = r;
 237         if (l >= al && dlt < al && dlt >= al - resistance)
 238             *w = r - al + 1;
 239         break;
 240     }
 241
 242     /* vertical snapping */
 243     switch (corn) {
 244     case Corner_TopLeft:
 245     case Corner_TopRight:
 246         dlt = t;
 247         drb = b + *h - c->frame->area.height;
 248         if (b <= ab && drb > ab && drb <= ab + resistance)
 249             *h = ab - t + 1;
 250         break;
 251     case Corner_BottomLeft:
 252     case Corner_BottomRight:
 253         dlt = t - *h + c->frame->area.height;
 254         drb = b;
 255         if (t >= at && dlt < at && dlt >= at - resistance)
 256             *h = b - at + 1;
 257         break;
 258     }
 259 }
 260
 261 static void event(ObEvent *e, void *foo)
 262 {
 263     if (e->type == Event_Client_Moving)
 264         resist_move(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1]);
 265     else if (e->type == Event_Client_Resizing)
 266         resist_size(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1],
 267                     e->data.c.num[2]);
 268 }
 269
 270 void plugin_startup()
 271 {
 272     dispatch_register(Event_Client_Moving | Event_Client_Resizing,
 273                       (EventHandler)event, NULL);
 274 }
 275
 276 void plugin_shutdown()
 277 {
 278     dispatch_register(0, (EventHandler)event, NULL);
 279 }