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#include "client.h"
#include "frame.h"
#include "stacking.h"
#include "screen.h"
static int resistance = 10;
static gboolean edge_resistance = TRUE; /* window-to-edge */
static gboolean window_resistance = TRUE; /* window-to-window */
void snap_move(Client *c, int *x, int *y, int w, int h)
{
GList *it;
Rect *area;
int l, t, r, b; /* requested edges */
int al, at, ar, ab; /* screen area edges */
int cl, ct, cr, cb; /* current edges */
gboolean snapx = FALSE, snapy = FALSE;
if (!edge_resistance) return;
/* add the frame to the dimensions */
l = *x;
t = *y;
r = l + w - 1;
b = t + h - 1;
cl = c->frame->area.x;
ct = c->frame->area.y;
cr = cl + c->frame->area.width - 1;
cb = ct + c->frame->area.height - 1;
/* snap to other clients */
if (window_resistance)
for (it = stacking_list; it != NULL; it = it->next) {
Client *target;
int tl, tt, tr, tb; /* 1 past the target's edges on each side */
target = it->data;
tl = target->frame->area.x - 1;
tt = target->frame->area.y - 1;
tr = tl + target->frame->area.width + 1;
tb = tt + target->frame->area.height + 1;
/* snapx and snapy ensure that the window snaps to the top-most
window edge available, without going all the way from
bottom-to-top in the stacking list
*/
if (!snapx && cl >= tr && l < tr && l >= tr - resistance)
*x = tr, snapx = TRUE;
else if (!snapx && cr <= tl && r > tl && r <= tl + resistance)
*x = tl - w + 1, snapx = TRUE;
else if (!snapy && ct >= tb && t < tb && t >= tb - resistance)
*y = tb, snapy = TRUE;
else if (!snapy && cb <= tt && b > tt && b <= tt + resistance)
*y = tt - h + 1, snapy = TRUE;
if (snapx && snapy) break;
}
/* get the screen boundaries */
area = screen_area(c->desktop);
al = area->x;
at = area->y;
ar = al + area->width - 1;
ab = at + area->height - 1;
/* snap to screen edges */
if (cl >= al && l < al && l >= al - resistance)
*x = al;
else if (cr <= ar && r > ar && r <= ar + resistance)
*x = ar - w + 1;
if (ct >= at && t < at && t >= at - resistance)
*y = at;
else if (cb <= ab && b > ab && b < ab + resistance)
*y = ab - h + 1;
}
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