Do some rewirering of alerts.

openlp/core/display/html/display.js

@@ -367,6 +367,20 @@ var Display = {
     Display._slides['0'] = 0;
     Display.reinit();
   },
+  /**
+   * Display an alert
+   * @param {string} text - The alert text
+   * @param {int} location - The location of the text (top, middle or bottom)
+  */
+ alert: function (text, location) {
+  console.debug(" alert text: " + text, ", location: " + location);
+  /*
+   * The implementation should show an alert.
+   * It should be able to handle receiving a new alert before a previous one is "finished", basically queueing it.
+   */
+  return;
+},
+
   /**
    * Add a slides. If the slide exists but the HTML is different, update the slide.
    * @param {string} verse - The verse number, e.g. "v1"

openlp/core/display/window.py

@@ -387,3 +387,9 @@ class DisplayWindow(QtWidgets.QWidget):
         """
         self.scale = scale
         self.run_javascript('Display.setScale({scale});'.format(scale=scale * 100))
+
+    def alert(self, text, location):
+        """
+        Set an alert
+        """
+        self.run_javascript('Display.alert({text}, {location});'.format(text=text, location=location))

openlp/plugins/alerts/lib/alertsmanager.py

@@ -29,6 +29,7 @@ from openlp.core.common.i18n import translate
 from openlp.core.common.mixins import LogMixin, RegistryProperties
 from openlp.core.common.registry import Registry, RegistryBase
 from openlp.core.common.settings import Settings
+from openlp.core.display.screens import ScreenList
 
 
 class AlertsManager(QtCore.QObject, RegistryBase, LogMixin, RegistryProperties):
@@ -78,15 +79,15 @@ class AlertsManager(QtCore.QObject, RegistryBase, LogMixin, RegistryProperties):
         """
         Format and request the Alert and start the timer.
         """
-        if not self.alert_list or (self.live_controller.display.screens.display_count == 1 and
+        if not self.alert_list or (len(ScreenList()) == 1 and
                                    not Settings().value('core/display on monitor')):
             return
         text = self.alert_list.pop(0)
         alert_tab = self.parent().settings_tab
-        self.live_controller.display.alert(text, alert_tab.location)
+        self.live_controller.displays[0].alert(text, alert_tab.location)
         # Check to see if we have a timer running.
-        if self.timer_id == 0:
-            self.timer_id = self.startTimer(int(alert_tab.timeout) * 1000)
+        #if self.timer_id == 0:
+        #    self.timer_id = self.startTimer(int(alert_tab.timeout) * 1000)
 
     def timerEvent(self, event):
         """