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34 #ifndef ICORELISTENER_H
35 #define ICORELISTENER_H
37 #include "core_global.h"
38 #include <QtCore/QObject>
43 \class Core::ICoreListener
45 \brief Provides a hook for plugins to veto on certain events emitted from
48 You implement this interface if you want to prevent certain events from
49 occurring, e.g. if you want to prevent the closing of the whole application
50 or to prevent the closing of an editor window under certain conditions.
52 If e.g. the application window requests a close, then first
53 ICoreListener::coreAboutToClose() is called (in arbitrary order) on all
54 registered objects implementing this interface. If one if these calls returns
55 false, the process is aborted and the event is ignored. If all calls return
56 true, the corresponding signal is emitted and the event is accepted/performed.
58 Guidelines for implementing:
60 \o Return false from the implemented method if you want to prevent the event.
61 \o You need to add your implementing object to the plugin managers objects:
62 ExtensionSystem::PluginManager::instance()->addObject(yourImplementingObject);
63 \o Don't forget to remove the object again at deconstruction (e.g. in the destructor of
66 class CORE_EXPORT ICoreListener : public QObject
70 ICoreListener(QObject *parent = 0) : QObject(parent) {}
71 virtual ~ICoreListener() {}
73 virtual bool editorAboutToClose(IEditor * /*editor*/) { return true; }
74 virtual bool coreAboutToClose() { return true; }
79 #endif // ICORELISTENER_H