#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());
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);
+ }
+ }
+}
projects / quassel.git / blobdiff