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Handle randr screen change events.

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This commit is contained in:
John Vogel 2013-12-15 14:56:28 -05:00
parent ae8525bc54
commit 9b7a2bd096
1 changed files with 75 additions and 44 deletions
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119
bar.c
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@ -44,6 +44,7 @@ typedef struct screen_t {
} screen_t;
static xcb_connection_t *c;
static xcb_screen_t *scr;
static xcb_window_t win;
static xcb_drawable_t canvas;
static xcb_gcontext_t draw_gc;
@ -488,14 +489,58 @@ get_randr_outputs(xcb_window_t w, screen_t **spp)
return cnt;
}
int
screen_adjust (screen_t *s, int num, screen_t **spp)
{
int i, cnt, right_bar_offset;
screen_t *t;
/* Add BAR_OFFSET to the last screen */
right_bar_offset = scr->width_in_pixels - bar_width - BAR_OFFSET;
for (cnt = num, i = num-1; i >= 0; i--) {
if (right_bar_offset > 0) {
if (right_bar_offset >= s[i].width) {
/* Remove the screen */
cnt--;
right_bar_offset -= s[i].width;
} else {
s[i].width -= right_bar_offset;
right_bar_offset = 0;
}
}
s[i].x -= BAR_OFFSET;
if (s[i].x < 0) {
/* First screen */
s[i].x = 0;
break;
}
}
/* Remove BAR_OFFSET from the first screen */
s[i].width -= BAR_OFFSET;
t = calloc(cnt, sizeof(screen_t));
if (t == NULL)
exit(1);
for (i = 0; i < cnt; i++) {
t[i].x = s[i].x;
t[i].width = s[i].width;
}
*spp = t;
return cnt;
}
void
init (void)
{
xcb_screen_t *scr;
xcb_window_t root;
screen_t *temp;
screen_t *stemp;
int snum;
int y;
int right_bar_offset;
xcb_generic_error_t *err;
const xcb_query_extension_reply_t *ext_reply;
@ -519,46 +564,18 @@ init (void)
exit (1);
/* Generate a list of screens */
num_screens = 0;
snum = 0;
if ((ext_reply = xcb_get_extension_data(c, &xcb_randr_id)) && ext_reply->present) {
num_screens = get_randr_outputs(root, &screens);
randr_event = ext_reply->first_event;
snum = get_randr_outputs(root, &stemp);
if (snum)
randr_event = ext_reply->first_event;
}
else if ((ext_reply = xcb_get_extension_data(c, &xcb_xinerama_id)) && ext_reply->present)
num_screens = get_xinerama_outputs(root, &screens);
snum = get_xinerama_outputs(root, &stemp);
if (num_screens) {
int i, num_saved = num_screens;
/* Add BAR_OFFSET to the last screen */
right_bar_offset = scr->width_in_pixels - bar_width - BAR_OFFSET;
for (i = num_screens-1; i >= 0; i--) {
if (right_bar_offset > 0) {
if (right_bar_offset >= screens[i].width) {
/* Remove the screen */
num_screens--;
right_bar_offset -= screens[i].width;
} else {
screens[i].width -= right_bar_offset;
right_bar_offset = 0;
}
}
screens[i].x -= BAR_OFFSET;
if (screens[i].x < 0) {
/* First screen */
screens[i].x = 0;
break;
}
}
/* Remove BAR_OFFSET from the first screen */
screens[i].width -= BAR_OFFSET;
/* Reallocate */
if (num_screens > num_saved) {
screens = realloc (screens, num_screens);
if (screens == NULL)
exit (1);
}
if (snum) {
num_screens = screen_adjust(stemp, snum, &screens);
free(stemp);
} else {
num_screens = 1;
screens = calloc(1, sizeof(screen_t));
@ -630,6 +647,18 @@ sighandle (int signal)
exit (0);
}
void
handle_randr_event (xcb_generic_event_t *ev)
{
int num;
screen_t *s, *t = screens;
num = get_randr_outputs(scr->root, &s);
num_screens = screen_adjust(s, num, &screens);
free(s);
free(t);
}
int
main (int argc, char **argv)
{
@ -685,12 +714,14 @@ main (int argc, char **argv)
}
if (pollin[1].revents & POLLIN) { /* Xserver broadcasted an event */
while ((ev = xcb_poll_for_event (c))) {
expose_ev = (xcb_expose_event_t *)ev;
int type = ev->response_type & 0x7f;
switch (ev->response_type & 0x7F) {
case XCB_EXPOSE:
if (expose_ev->count == 0) redraw = 1;
break;
if (randr_event > -1 && type == randr_event + XCB_RANDR_SCREEN_CHANGE_NOTIFY)
handle_randr_event(ev);
else if (type == XCB_EXPOSE) {
expose_ev = (xcb_expose_event_t *)ev;
if (expose_ev->count == 0)
redraw = 1;
}
free (ev);