Dogcows Code - chaz/openbox/blob - openbox/snap.c

   1 #include "client.h"
   2 #include "frame.h"
   3 #include "stacking.h"
   4 #include "screen.h"
   5
   6 static int resistance = 10;
   7 static gboolean edge_resistance = TRUE; /* window-to-edge */
   8 static gboolean window_resistance = TRUE; /* window-to-window */
   9
  10 void snap_move(Client *c, int *x, int *y, int w, int h)
  11 {
  12     GList *it;
  13     Rect *area;
  14     int l, t, r, b; /* requested edges */
  15     int al, at, ar, ab; /* screen area edges */
  16     int cl, ct, cr, cb; /* current edges */
  17     gboolean snapx = FALSE, snapy = FALSE;
  18
  19     if (!edge_resistance) return;
  20
  21     /* add the frame to the dimensions */
  22     l = *x;
  23     t = *y;
  24     r = l + w - 1;
  25     b = t + h - 1;
  26
  27     cl = c->frame->area.x;
  28     ct = c->frame->area.y;
  29     cr = cl + c->frame->area.width - 1;
  30     cb = ct + c->frame->area.height - 1;
  31
  32     /* snap to other clients */
  33     if (window_resistance)
  34         for (it = stacking_list; it != NULL; it = it->next) {
  35             Client *target;
  36             int tl, tt, tr, tb; /* 1 past the target's edges on each side */
  37
  38             target = it->data;
  39
  40             tl = target->frame->area.x - 1;
  41             tt = target->frame->area.y - 1;
  42             tr = tl + target->frame->area.width + 1;
  43             tb = tt + target->frame->area.height + 1;
  44
  45             /* snapx and snapy ensure that the window snaps to the top-most
  46                window edge available, without going all the way from
  47                bottom-to-top in the stacking list
  48             */
  49             if (!snapx && cl >= tr && l < tr && l >= tr - resistance)
  50                 *x = tr, snapx = TRUE;
  51             else if (!snapx && cr <= tl && r > tl && r <= tl + resistance)
  52                 *x = tl - w + 1, snapx = TRUE;
  53             else if (!snapy && ct >= tb && t < tb && t >= tb - resistance)
  54                 *y = tb, snapy = TRUE;
  55             else if (!snapy && cb <= tt && b > tt && b <= tt + resistance)
  56                 *y = tt - h + 1, snapy = TRUE;
  57
  58             if (snapx && snapy) break;
  59         }
  60
  61     /* get the screen boundaries */
  62     area = screen_area(c->desktop);
  63     al = area->x;
  64     at = area->y;
  65     ar = al + area->width - 1;
  66     ab = at + area->height - 1;
  67
  68     /* snap to screen edges */
  69     if (cl >= al && l < al && l >= al - resistance)
  70         *x = al;
  71     else if (cr <= ar && r > ar && r <= ar + resistance)
  72             *x = ar - w + 1;
  73     if (ct >= at && t < at && t >= at - resistance)
  74         *y = at;
  75     else if (cb <= ab && b > ab && b < ab + resistance)
  76         *y = ab - h + 1;
  77 }