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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#ifndef SV_DEFERRED_NOTIFIER_H
#define SV_DEFERRED_NOTIFIER_H
#include "Model.h"
#include "base/Extents.h"
#include <QMutex>
#include <QMutexLocker>
namespace sv {
class DeferredNotifier
{
public:
enum Mode {
NOTIFY_ALWAYS,
NOTIFY_DEFERRED
};
DeferredNotifier(Model *m, ModelId id, Mode mode) :
m_model(m), m_modelId(id), m_mode(mode) { }
Mode getMode() const {
return m_mode;
}
void switchMode(Mode newMode) {
m_mode = newMode;
}
void update(sv_frame_t frame, sv_frame_t duration) {
if (m_mode == NOTIFY_ALWAYS) {
m_model->modelChangedWithin(m_modelId, frame, frame + duration);
m_model->modelChanged(m_modelId);
} else {
QMutexLocker locker(&m_mutex);
m_extents.sample(frame);
m_extents.sample(frame + duration);
}
}
void makeDeferredNotifications() {
bool shouldEmit = false;
sv_frame_t from, to;
{ QMutexLocker locker(&m_mutex);
if (m_extents.isSet()) {
shouldEmit = true;
from = m_extents.getMin();
to = m_extents.getMax();
}
}
if (shouldEmit) {
m_model->modelChangedWithin(m_modelId, from, to);
m_model->modelChanged(m_modelId);
QMutexLocker locker(&m_mutex);
m_extents.reset();
}
}
private:
Model *m_model;
ModelId m_modelId;
Mode m_mode;
QMutex m_mutex;
Extents<sv_frame_t> m_extents;
};
} // end namespace sv
#endif
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