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 win_resistance;
  11 static int edge_resistance;
  12
  13 static void parse_xml(ObParseInst *i, xmlDocPtr doc, xmlNodePtr node, void *d)
  14 {
  15     xmlNodePtr n;
  16
  17     node = node->xmlChildrenNode;
  18     if ((n = parse_find_node("strength", node)))
  19         win_resistance = parse_int(doc, n);
  20     if ((n = parse_find_node("screen_edge_strength", node)))
  21         edge_resistance = parse_int(doc, n);
  22 }
  23
  24 void plugin_setup_config(ObParseInst *i)
  25 {
  26     win_resistance = edge_resistance = DEFAULT_RESISTANCE;
  27
  28     parse_register(i, "resistance", parse_xml, NULL);
  29 }
  30
  31 static void resist_move(ObClient *c, int *x, int *y)
  32 {
  33     GList *it;
  34     Rect *area;
  35     guint i;
  36     int l, t, r, b; /* requested edges */
  37     int al, at, ar, ab; /* screen area edges */
  38     int cl, ct, cr, cb; /* current edges */
  39     int w, h; /* current size */
  40     ObClient *snapx = NULL, *snapy = NULL;
  41
  42     w = c->frame->area.width;
  43     h = c->frame->area.height;
  44
  45     l = *x;
  46     t = *y;
  47     r = l + w - 1;
  48     b = t + h - 1;
  49
  50     cl = c->frame->area.x;
  51     ct = c->frame->area.y;
  52     cr = cl + c->frame->area.width - 1;
  53     cb = ct + c->frame->area.height - 1;
  54
  55     /* snap to other clients */
  56     if (win_resistance)
  57         for (it = stacking_list; it != NULL; it = it->next) {
  58             ObClient *target;
  59             int tl, tt, tr, tb; /* 1 past the target's edges on each side */
  60
  61             if (!WINDOW_IS_CLIENT(it->data))
  62                 continue;
  63             target = it->data;
  64             /* don't snap to self or non-visibles */
  65             if (!target->frame->visible || target == c) continue;
  66
  67             tl = target->frame->area.x - 1;
  68             tt = target->frame->area.y - 1;
  69             tr = tl + target->frame->area.width + 1;
  70             tb = tt + target->frame->area.height + 1;
  71
  72             /* snapx and snapy ensure that the window snaps to the top-most
  73                window edge available, without going all the way from
  74                bottom-to-top in the stacking list
  75             */
  76             if (snapx == NULL) {
  77                 if (ct < tb && cb > tt) {
  78                     if (cl >= tr && l < tr && l >= tr - win_resistance)
  79                         *x = tr, snapx = target;
  80                     else if (cr <= tl && r > tl && r <= tl + win_resistance)
  81                         *x = tl - w + 1, snapx = target;
  82                     if (snapx != NULL) {
  83                         /* try to corner snap to the window */
  84                         if (ct > tt && t <= tt && t > tt - win_resistance)
  85                             *y = tt + 1, snapy = target;
  86                         else if (cb < tb && b >= tb && b < tb + win_resistance)
  87                             *y = tb - h, snapy = target;
  88                     }
  89                 }
  90             }
  91             if (snapy == NULL) {
  92                 if (cl < tr && cr > tl) {
  93                     if (ct >= tb && t < tb && t >= tb - win_resistance)
  94                         *y = tb, snapy = target;
  95                     else if (cb <= tt && b > tt && b <= tt + win_resistance)
  96                         *y = tt - h + 1, snapy = target;
  97                     if (snapy != NULL) {
  98                         /* try to corner snap to the window */
  99                         if (cl > tl && l <= tl && l > tl - win_resistance)
 100                             *x = tl + 1, snapx = target;
 101                         else if (cr < tr && r >= tr && r < tr + win_resistance)
 102                             *x = tr - w, snapx = target;
 103                     }
 104                 }
 105             }
 106
 107             if (snapx && snapy) break;
 108         }
 109
 110     /* get the screen boundaries */
 111     if (edge_resistance) {
 112         for (i = 0; i < screen_num_monitors; ++i) {
 113             area = screen_area_monitor(c->desktop, i);
 114
 115             if (!RECT_INTERSECTS_RECT(*area, c->frame->area))
 116                 continue;
 117
 118             al = area->x;
 119             at = area->y;
 120             ar = al + area->width - 1;
 121             ab = at + area->height - 1;
 122
 123             /* snap to screen edges */
 124             if (cl >= al && l < al && l >= al - edge_resistance)
 125                 *x = al;
 126             else if (cr <= ar && r > ar && r <= ar + edge_resistance)
 127                 *x = ar - w + 1;
 128             if (ct >= at && t < at && t >= at - edge_resistance)
 129                 *y = at;
 130             else if (cb <= ab && b > ab && b < ab + edge_resistance)
 131                 *y = ab - h + 1;
 132         }
 133     }
 134 }
 135
 136 static void resist_size(ObClient *c, int *w, int *h, ObCorner corn)
 137 {
 138     GList *it;
 139     ObClient *target; /* target */
 140     int l, t, r, b; /* my left, top, right and bottom sides */
 141     int dlt, drb; /* my destination left/top and right/bottom sides */
 142     int tl, tt, tr, tb; /* target's left, top, right and bottom bottom sides */
 143     Rect *area;
 144     int al, at, ar, ab; /* screen boundaries */
 145     ObClient *snapx = NULL, *snapy = NULL;
 146
 147     /* don't snap windows with size increments */
 148     if (c->size_inc.width > 1 || c->size_inc.height > 1)
 149         return;
 150
 151     l = c->frame->area.x;
 152     r = l + c->frame->area.width - 1;
 153     t = c->frame->area.y;
 154     b = t + c->frame->area.height - 1;
 155
 156     /* get the screen boundaries */
 157     area = screen_area(c->desktop);
 158     al = area->x;
 159     at = area->y;
 160     ar = al + area->width - 1;
 161     ab = at + area->height - 1;
 162
 163     /* snap to other windows */
 164     if (win_resistance) {
 165         for (it = stacking_list; it != NULL; it = it->next) {
 166             if (!WINDOW_IS_CLIENT(it->data))
 167                 continue;
 168             target = it->data;
 169
 170             /* don't snap to invisibles or ourself */
 171             if (!target->frame->visible || target == c) continue;
 172
 173             tl = target->frame->area.x;
 174             tr = target->frame->area.x + target->frame->area.width - 1;
 175             tt = target->frame->area.y;
 176             tb = target->frame->area.y + target->frame->area.height - 1;
 177
 178             if (snapx == NULL) {
 179                 /* horizontal snapping */
 180                 if (t < tb && b > tt) {
 181                     switch (corn) {
 182                     case OB_CORNER_TOPLEFT:
 183                     case OB_CORNER_BOTTOMLEFT:
 184                         dlt = l;
 185                         drb = r + *w - c->frame->area.width;
 186                         if (r < tl && drb >= tl && drb < tl + win_resistance)
 187                             *w = tl - l, snapx = target;
 188                         break;
 189                     case OB_CORNER_TOPRIGHT:
 190                     case OB_CORNER_BOTTOMRIGHT:
 191                         dlt = l - *w + c->frame->area.width;
 192                         drb = r;
 193                         if (l > tr && dlt <= tr && dlt > tr - win_resistance)
 194                             *w = r - tr, snapx = target;
 195                         break;
 196                     }
 197                 }
 198             }
 199
 200             if (snapy == NULL) {
 201                 /* vertical snapping */
 202                 if (l < tr && r > tl) {
 203                     switch (corn) {
 204                     case OB_CORNER_TOPLEFT:
 205                     case OB_CORNER_TOPRIGHT:
 206                         dlt = t;
 207                         drb = b + *h - c->frame->area.height;
 208                         if (b < tt && drb >= tt && drb < tt + win_resistance)
 209                             *h = tt - t, snapy = target;
 210                         break;
 211                     case OB_CORNER_BOTTOMLEFT:
 212                     case OB_CORNER_BOTTOMRIGHT:
 213                         dlt = t - *h + c->frame->area.height;
 214                         drb = b;
 215                         if (t > tb && dlt <= tb && dlt > tb - win_resistance)
 216                             *h = b - tb, snapy = target;
 217                         break;
 218                     }
 219                 }
 220             }
 221
 222             /* snapped both ways */
 223             if (snapx && snapy) break;
 224         }
 225     }
 226
 227     /* snap to screen edges */
 228
 229     if (edge_resistance) {
 230         /* horizontal snapping */
 231         switch (corn) {
 232         case OB_CORNER_TOPLEFT:
 233         case OB_CORNER_BOTTOMLEFT:
 234             dlt = l;
 235             drb = r + *w - c->frame->area.width;
 236             if (r <= ar && drb > ar && drb <= ar + edge_resistance)
 237                 *w = ar - l + 1;
 238             break;
 239         case OB_CORNER_TOPRIGHT:
 240         case OB_CORNER_BOTTOMRIGHT:
 241             dlt = l - *w + c->frame->area.width;
 242             drb = r;
 243             if (l >= al && dlt < al && dlt >= al - edge_resistance)
 244                 *w = r - al + 1;
 245             break;
 246         }
 247
 248         /* vertical snapping */
 249         switch (corn) {
 250         case OB_CORNER_TOPLEFT:
 251         case OB_CORNER_TOPRIGHT:
 252             dlt = t;
 253             drb = b + *h - c->frame->area.height;
 254             if (b <= ab && drb > ab && drb <= ab + edge_resistance)
 255                 *h = ab - t + 1;
 256             break;
 257         case OB_CORNER_BOTTOMLEFT:
 258         case OB_CORNER_BOTTOMRIGHT:
 259             dlt = t - *h + c->frame->area.height;
 260             drb = b;
 261             if (t >= at && dlt < at && dlt >= at - edge_resistance)
 262                 *h = b - at + 1;
 263             break;
 264         }
 265     }
 266 }
 267
 268 static void event(ObEvent *e, void *foo)
 269 {
 270     if (e->type == Event_Client_Moving)
 271         resist_move(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1]);
 272     else if (e->type == Event_Client_Resizing)
 273         resist_size(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1],
 274                     e->data.c.num[2]);
 275 }
 276
 277 void plugin_startup()
 278 {
 279     dispatch_register(Event_Client_Moving | Event_Client_Resizing,
 280                       (EventHandler)event, NULL);
 281 }
 282
 283 void plugin_shutdown()
 284 {
 285     dispatch_register(0, (EventHandler)event, NULL);
 286 }