X-Git-Url: https://git.quassel-irc.org/?p=quassel.git;a=blobdiff_plain;f=src%2Fcommon%2Feventmanager.cpp;h=96648646d300a8392e1eeaec9e397737fe623df8;hp=a8ddd67516a1e04e46fc6ccbb408f22cee1c33c1;hb=eca32e09b23dd261d7eaf11a4843949220b302d4;hpb=d3c9d89989df59c073fc33637ba4e8bbdb6ab397

diff --git a/src/common/eventmanager.cpp b/src/common/eventmanager.cpp
index a8ddd675..96648646 100644
--- a/src/common/eventmanager.cpp
+++ b/src/common/eventmanager.cpp
@@ -20,18 +20,60 @@
 
 #include "eventmanager.h"
 
+#include <QCoreApplication>
+#include <QEvent>
 #include <QDebug>
-#include <QMetaEnum>
+
+#include "event.h"
 
 EventManager::EventManager(QObject *parent) : QObject(parent) {
 
 }
 
-void EventManager::registerObject(QObject *object, RegistrationMode mode, const QString &methodPrefix) {
-  int eventEnumIndex = metaObject()->indexOfEnumerator("EventType");
-  Q_ASSERT(eventEnumIndex >= 0);
-  QMetaEnum eventEnum = metaObject()->enumerator(eventEnumIndex);
+EventManager::~EventManager() {
+  // pending events won't be delivered anymore, but we do need to delete them
+  qDeleteAll(_eventQueue);
+}
+
+QMetaEnum EventManager::eventEnum() const {
+  if(!_enum.isValid()) {
+    int eventEnumIndex = metaObject()->indexOfEnumerator("EventType");
+    Q_ASSERT(eventEnumIndex >= 0);
+    _enum = metaObject()->enumerator(eventEnumIndex);
+    Q_ASSERT(_enum.isValid());
+  }
+  return _enum;
+}
+
+EventManager::EventType EventManager::eventTypeByName(const QString &name) const {
+  int val = eventEnum().keyToValue(name.toLatin1());
+  return (val == -1) ? Invalid : static_cast<EventType>(val);
+}
+
+EventManager::EventType EventManager::eventGroupByName(const QString &name) const {
+  EventType type = eventTypeByName(name);
+  return type == Invalid? Invalid : static_cast<EventType>(type & EventGroupMask);
+}
+
+QString EventManager::enumName(EventType type) const {
+  return eventEnum().valueToKey(type);
+}
+
+/* NOTE:
+   Registering and calling handlers works fine even if they specify a subclass of Event as their parameter.
+   However, this most probably is a result from a reinterpret_cast somewhere deep inside Qt, so there is *no*
+   type safety. If the event sent is of the wrong class type, you'll get a neat segfault!
+   Thus, we need to make sure that events are of the correct class type when sending!
+
+   We might add a registration-time check later, which will require matching the enum base name (e.g. "IrcEvent") with
+   the type the handler claims to support. This still won't protect us from someone sending an IrcEvent object
+   with an enum type "NetworkIncoming", for example.
 
+   Another way would be to add a check into the various Event subclasses, such that the ctor matches the given event type
+   with the actual class. Possibly (optionally) using rtti...
+*/
+
+void EventManager::registerObject(QObject *object, Priority priority, const QString &methodPrefix) {
   for(int i = object->metaObject()->methodOffset(); i < object->metaObject()->methodCount(); i++) {
     QString methodSignature(object->metaObject()->method(i).signature());
 
@@ -41,34 +83,102 @@ void EventManager::registerObject(QObject *object, RegistrationMode mode, const
     methodSignature = methodSignature.section('(',0,0);  // chop the attribute list
     methodSignature = methodSignature.mid(methodPrefix.length()); // strip prefix
 
-    int eventType = eventEnum.keyToValue(methodSignature.toAscii());
+    int eventType = eventEnum().keyToValue(methodSignature.toAscii());
     if(eventType < 0) {
       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) {
+  // qDebug() << "Sending" << event;
+  _eventQueue.append(event);
+  if(_eventQueue.count() == 1) // we're not currently processing another event
+    processEvents();
+}
+
+void EventManager::customEvent(QEvent *event) {
+  if(event->type() == QEvent::User) {
+    processEvents();
+    event->accept();
+  }
+}
+
+void EventManager::processEvents() {
+  // we only process one event at a time for now, and let Qt's own event processing come in between
+  if(_eventQueue.isEmpty())
+    return;
+  dispatchEvent(_eventQueue.first());
+  _eventQueue.removeFirst();
+  if(_eventQueue.count())
+    QCoreApplication::postEvent(this, new QEvent(QEvent::User));
+}
+
+void EventManager::dispatchEvent(Event *event) {
+  //qDebug() << "Dispatching" << 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);
+    }
+  }
+}