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