i3bar: Handle DestroyNotify events

Handle DestroyNotify events by removing the tray client from the tray
client list held in memory.

This change is intended to be part of the i3bar's implementation of the
XEmbed protocol. For more information, see:

<http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html>

According to the XEmbed protocol specification, this is one way for a
tray client to finish the protocol. After this event is received, i3bar
should have no more interaction with the tray client.

diff --git a/i3bar/src/xcb.c b/i3bar/src/xcb.c
index 0c8de65ec5baeb5a8025deaee577f951ca3118b5..f25888b0554c102d8ab1250e9beb9f59345e4786 100644 (file)
--- a/i3bar/src/xcb.c
+++ b/i3bar/src/xcb.c
@@ -622,6 +622,39 @@ static void handle_client_message(xcb_client_message_event_t* event) {
     }
 }
 
+/*
+ * Handles DestroyNotify events by removing the tray client from the data
+ * structure. According to the XEmbed protocol, this is one way for a tray
+ * client to finish the protocol. After this event is received, there is no
+ * further interaction with the tray client.
+ *
+ * See: http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
+ *
+ */
+static void handle_destroy_notify(xcb_destroy_notify_event_t* event) {
+    DLOG("DestroyNotify for window = %08x, event = %08x\n", event->window, event->event);
+
+    i3_output *walk;
+    SLIST_FOREACH(walk, outputs, slist) {
+        if (!walk->active)
+            continue;
+        DLOG("checking output %s\n", walk->name);
+        trayclient *trayclient;
+        TAILQ_FOREACH(trayclient, walk->trayclients, tailq) {
+            if (trayclient->win != event->window)
+                continue;
+
+            DLOG("Removing tray client with window ID %08x\n", event->window);
+            TAILQ_REMOVE(walk->trayclients, trayclient, tailq);
+
+            /* Trigger an update, we now have more space for the statusline */
+            configure_trayclients();
+            draw_bars(false);
+            return;
+        }
+    }
+}
+
 /*
  * Handles UnmapNotify events. These events happen when a tray window unmaps
  * itself. We then update our data structure
@@ -798,8 +831,11 @@ void xcb_chk_cb(struct ev_loop *loop, ev_check *watcher, int revents) {
                  * example system tray widgets talk to us directly via client messages. */
                 handle_client_message((xcb_client_message_event_t*) event);
                 break;
-            case XCB_UNMAP_NOTIFY:
             case XCB_DESTROY_NOTIFY:
+                /* DestroyNotify signifies the end of the XEmbed protocol */
+                handle_destroy_notify((xcb_destroy_notify_event_t*) event);
+                break;
+            case XCB_UNMAP_NOTIFY:
                 /* UnmapNotifies are received when a tray window unmaps itself */
                 handle_unmap_notify((xcb_unmap_notify_event_t*) event);
                 break;