room info: add option to show next talk if no talk is running

pretalx_broadcast_tools/forms.py

@@ -41,6 +41,14 @@ class BroadcastToolsSettingsForm(I18nFormMixin, HierarkeyForm):
         label=_("lower content"),
         required=True,
     )
+    broadcast_tools_room_info_show_next_talk = BooleanField(
+        help_text=_(
+            "If no talk is running in the room, show the time and title "
+            "of the next talk in the room."
+        ),
+        label=_("Show next talk"),
+        required=False,
+    )
 
     broadcast_tools_pdf_show_internal_notes = BooleanField(
         help_text=_(

pretalx_broadcast_tools/static/pretalx_broadcast_tools/generic.js

@@ -8,8 +8,6 @@ function get_current_talk(max_offset) {
         return null;
     }
 
-    current_talk = null;
-
     for (let offset = 0; offset <= max_offset; offset++) {
         time_start = new Date(Date.now() + offset*60000).getTime();
         time_end = new Date(Date.now() - offset*60000).getTime();
@@ -26,17 +24,39 @@ function get_current_talk(max_offset) {
             talk_end = new Date(talk['end']).getTime();
 
             if (talk_start < time_start && talk_end > time_end) {
-                current_talk = talk;
-                break;
+                return talk;
             }
         }
-
-        if (current_talk) {
-            break;
-        }
     }
 
-    return current_talk;
+    return null;
+}
+
+function get_next_talk() {
+    room_name = get_room_name();
+
+    if (!room_name) {
+        return null;
+    }
+
+    time_start = new Date(Date.now()).getTime();
+
+    for (talk_i in schedule['talks']) {
+        talk = schedule['talks'][talk_i]
+
+        if (schedule['rooms'].length > 1 && talk['room'] != room_name) {
+            // not in this room
+            continue;
+        }
+
+        talk_start = new Date(talk['start']).getTime();
+
+        if (talk_start > time_start) {
+            return talk;
+        }
+    }
+
+    return null;
 }
 
 function get_room_name() {

pretalx_broadcast_tools/static/pretalx_broadcast_tools/room_info.js

@@ -41,6 +41,8 @@ function update_room_info() {
     }
 
     current_talk = get_current_talk(15);
+    next_talk = get_next_talk();
+
     if (current_talk) {
         if (event_info['room-info']['lower_info'] == 'feedback_qr') {
             qr_info = '<img src="' + current_talk['urls']['feedback_qr'] + '" alt="Feedback QR Code"><p>Leave Feedback by scanning the code or visiting ' + current_talk['urls']['feedback'] + '</p>';
@@ -59,8 +61,14 @@ function update_room_info() {
     } else {
         $('#broadcast_tools_room_info_roomname').text(event_info['name']);
         $('#broadcast_tools_room_info_title').text(room_name);
-        $('#broadcast_tools_room_info_speaker').text('');
         $('#broadcast_tools_room_info_qr').text('');
+
+        if (next_talk && event_info['room-info']['show_next_talk']) {
+            next_time = new Date(next_talk['start']);
+            $('#broadcast_tools_room_info_speaker').text(next_time.getHours() + ':' + next_time.getMinutes() + ' ' + next_talk['title']);
+        } else {
+            $('#broadcast_tools_room_info_speaker').text('');
+        }
     }
 
     if (current_talk && current_talk['track']) {

pretalx_broadcast_tools/templates/pretalx_broadcast_tools/orga.html

@@ -64,6 +64,7 @@
                 {% translate "Room info" %}
             </legend>
             {% bootstrap_field form.broadcast_tools_room_info_lower_content layout='event' %}
+            {% bootstrap_field form.broadcast_tools_room_info_show_next_talk layout='event' %}
         </fieldset>
         <fieldset>
             <legend>

pretalx_broadcast_tools/views.py

@@ -77,6 +77,9 @@ class BroadcastToolsEventInfoView(View):
                 "room-info": {
                     "lower_info": self.request.event.settings.broadcast_tools_room_info_lower_content
                     or "",
+                    "show_next_talk": True
+                    if self.request.event.settings.broadcast_tools_room_info_show_next_talk
+                    else False,
                 },
                 "slug": self.request.event.slug,
             },