Basic event dispatching (with priorities)

[quassel.git] / src / common / eventmanager.cpp

diff --git a/src/common/eventmanager.cpp b/src/common/eventmanager.cpp
index a8ddd67..c5f01b6 100644 (file)
--- a/src/common/eventmanager.cpp
+++ b/src/common/eventmanager.cpp
@@ -23,11 +23,13 @@
 #include <QDebug>
 #include <QMetaEnum>
 
+#include "event.h"
+
 EventManager::EventManager(QObject *parent) : QObject(parent) {
 
 }
 
-void EventManager::registerObject(QObject *object, RegistrationMode mode, const QString &methodPrefix) {
+void EventManager::registerObject(QObject *object, Priority priority, const QString &methodPrefix) {
   int eventEnumIndex = metaObject()->indexOfEnumerator("EventType");
   Q_ASSERT(eventEnumIndex >= 0);
   QMetaEnum eventEnum = metaObject()->enumerator(eventEnumIndex);
@@ -46,29 +48,75 @@ void EventManager::registerObject(QObject *object, RegistrationMode mode, const
       qWarning() << Q_FUNC_INFO << QString("Could not find EventType %1").arg(methodSignature);
       continue;
     }
-    Handler handler(object, i);
-    mode == Prepend ? registeredHandlers()[static_cast<EventType>(eventType)].prepend(handler)
-                    : registeredHandlers()[static_cast<EventType>(eventType)].append(handler);
-
+    Handler handler(object, i, priority);
+    registeredHandlers()[static_cast<EventType>(eventType)].append(handler);
     qDebug() << "Registered event handler for" << methodSignature << "in" << object;
   }
 }
 
-void EventManager::registerEventHandler(EventType event, QObject *object, const char *slot, RegistrationMode mode) {
-  registerEventHandler(QList<EventType>() << event, object, slot, mode);
+void EventManager::registerEventHandler(EventType event, QObject *object, const char *slot, Priority priority) {
+  registerEventHandler(QList<EventType>() << event, object, slot, priority);
 }
 
-void EventManager::registerEventHandler(QList<EventType> events, QObject *object, const char *slot, RegistrationMode mode) {
+void EventManager::registerEventHandler(QList<EventType> events, QObject *object, const char *slot, Priority priority) {
   int methodIndex = object->metaObject()->indexOfMethod(slot);
   if(methodIndex < 0) {
     qWarning() << Q_FUNC_INFO << QString("Slot %1 not found in object %2").arg(slot).arg(object->objectName());
     return;
   }
-  Handler handler(object, methodIndex);
+  Handler handler(object, methodIndex, priority);
   foreach(EventType event, events) {
-    mode == Prepend ? registeredHandlers()[event].prepend(handler)
-                    : registeredHandlers()[event].append(handler);
-
+    registeredHandlers()[event].append(handler);
     qDebug() << "Registered event handler for" << event << "in" << object;
   }
 }
+
+// not threadsafe! if we should want that, we need to add a mutexed queue somewhere in this general area.
+void EventManager::sendEvent(Event *event) {
+  dispatchEvent(event);
+}
+
+void EventManager::dispatchEvent(Event *event) {
+  // we try handlers from specialized to generic by masking the enum
+
+  // build a list sorted by priorities that contains all eligible handlers
+  QList<Handler> handlers;
+  EventType type = event->type();
+  insertHandlers(registeredHandlers().value(type), handlers);
+
+  // check if we have a generic handler for the event group
+  if((type & EventGroupMask) != type)
+    insertHandlers(registeredHandlers().value(type & EventGroupMask), handlers);
+
+  // now dispatch the event
+  QList<Handler>::const_iterator it = handlers.begin();
+  while(it != handlers.end()) {
+
+    // TODO: check event flags here!
+
+    void *param[] = {0, Q_ARG(Event *, event).data() };
+    it->object->qt_metacall(QMetaObject::InvokeMetaMethod, it->methodIndex, param);
+
+    ++it;
+  }
+
+  // finally, delete it
+  delete event;
+}
+
+void EventManager::insertHandlers(const QList<Handler> &newHandlers, QList<Handler> &existing) {
+  foreach(Handler handler, newHandlers) {
+    if(existing.isEmpty())
+      existing.append(handler);
+    else {
+      // need to insert it at the proper position
+      QList<Handler>::iterator it = existing.begin();
+      while(it != existing.end()) {
+        if(handler.priority > it->priority)
+          break;
+        ++it;
+      }
+      existing.insert(it, handler);
+    }
+  }
+}