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view data/model/DeferredNotifier.h @ 1810:ee3b248bda25
Forward getIndexForEvent
author | Chris Cannam |
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date | Fri, 22 Nov 2019 14:12:16 +0000 |
parents | 6d09d68165a4 |
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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> 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); } 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); 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; }; #endif