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i3bar: count references to blocks

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This prevents blocks from being destroyed before their hotspots are destroyed,
in case it is used for a pending click event that fires between the bar
receiving a new status, which destroys the block, and the bar rendering the new
status, which destroys the hotspot; this problem can be easily produced by
scrolling on a block that immediately causes a new status to be sent, with
multiple outputs
This commit is contained in:
Ian Fan 2018-09-12 08:28:28 +01:00
parent af9e8f94cc
commit 2eaef80206
4 changed files with 19 additions and 6 deletions
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7
swaybar/render.c
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@ -115,6 +115,10 @@ static enum hotspot_event_handling block_hotspot_callback(struct swaybar_output
return i3bar_block_send_click(status, block, x, y, button);
}
static void i3bar_block_unref_callback(void *data) {
i3bar_block_unref(data);
}
static uint32_t render_status_block(cairo_t *cairo,
struct swaybar_config *config, struct swaybar_output *output,
struct i3bar_block *block, double *x,
@ -179,8 +183,9 @@ static uint32_t render_status_block(cairo_t *cairo,
hotspot->width = width;
hotspot->height = height;
hotspot->callback = block_hotspot_callback;
hotspot->destroy = NULL;
hotspot->destroy = i3bar_block_unref_callback;
hotspot->data = block;
block->ref_count++;
wl_list_insert(&output->hotspots, &hotspot->link);
double pos = *x;