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