X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fio%2Feventobject.h;fp=source%2Fio%2Feventobject.h;h=b8423c927f1daa95dd517c961e83c3477cf42731;hb=c21ab7e49852585df01b4cc19599e25a918b581b;hp=0000000000000000000000000000000000000000;hpb=31e72f50fbb34d86877e5110401c49ce3fefd4bb;p=libs%2Fcore.git

diff --git a/source/io/eventobject.h b/source/io/eventobject.h
new file mode 100644
index 0000000..b8423c9
--- /dev/null
+++ b/source/io/eventobject.h
@@ -0,0 +1,54 @@
+#ifndef MSP_IO_EVENTOBJECT_H_
+#define MSP_IO_EVENTOBJECT_H_
+
+#include "base.h"
+
+namespace Msp {
+namespace IO {
+
+struct Handle;
+
+/**
+Interface class for objects that can provide event-based I/O.  These objects
+can be fed to the various poll functions in poll.h, or added to an
+EventDispatcher to generate event signals.
+*/
+class EventObject: public Base
+{
+public:
+	/** Emitted when there is data available for reading.  If all data is not
+	read, the signal is emitted again immediately. */
+	sigc::signal<void> signal_data_available;
+
+	/** Emitted when the mask of interesting events changes.  Mainly for use by
+	EventDispatcher. */
+	sigc::signal<void, PollEvent> signal_events_changed;
+
+private:
+	PollEvent events;
+
+protected:
+	EventObject();
+
+	void set_events(PollEvent);
+public:
+	/** Returns a mask of the currently interesting events.  Used by
+	EventDispatcher. */
+	PollEvent get_events() const { return events; }
+
+	/** Returns a handle for polling. */
+	virtual const Handle &get_event_handle() = 0;
+
+	/** Notifies the object of an event.  Used by EventDispatcher. */
+	void event(PollEvent);
+
+protected:
+	/** Called when an event occurs.  Derived classes can implement this to
+	process events. */
+	virtual void on_event(PollEvent) { }
+};
+
+} // namespace IO
+} // namespace Msp
+
+#endif