/
juce_ChangeBroadcaster.cpp
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juce_ChangeBroadcaster.cpp
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/*
==============================================================================
This file is part of the JUCE library - "Jules' Utility Class Extensions"
Copyright 2004-11 by Raw Material Software Ltd.
------------------------------------------------------------------------------
JUCE can be redistributed and/or modified under the terms of the GNU General
Public License (Version 2), as published by the Free Software Foundation.
A copy of the license is included in the JUCE distribution, or can be found
online at www.gnu.org/licenses.
JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
------------------------------------------------------------------------------
To release a closed-source product which uses JUCE, commercial licenses are
available: visit www.rawmaterialsoftware.com/juce for more information.
==============================================================================
*/
ChangeBroadcaster::ChangeBroadcaster() noexcept
{
// are you trying to create this object before or after juce has been intialised??
jassert (MessageManager::getInstanceWithoutCreating() != nullptr);
callback.owner = this;
}
ChangeBroadcaster::~ChangeBroadcaster()
{
// all event-based objects must be deleted BEFORE juce is shut down!
jassert (MessageManager::getInstanceWithoutCreating() != nullptr);
}
void ChangeBroadcaster::addChangeListener (ChangeListener* const listener)
{
// Listeners can only be safely added when the event thread is locked
// You can use a MessageManagerLock if you need to call this from another thread.
jassert (MessageManager::getInstance()->currentThreadHasLockedMessageManager());
changeListeners.add (listener);
}
void ChangeBroadcaster::removeChangeListener (ChangeListener* const listener)
{
// Listeners can only be safely added when the event thread is locked
// You can use a MessageManagerLock if you need to call this from another thread.
jassert (MessageManager::getInstance()->currentThreadHasLockedMessageManager());
changeListeners.remove (listener);
}
void ChangeBroadcaster::removeAllChangeListeners()
{
// Listeners can only be safely added when the event thread is locked
// You can use a MessageManagerLock if you need to call this from another thread.
jassert (MessageManager::getInstance()->currentThreadHasLockedMessageManager());
changeListeners.clear();
}
void ChangeBroadcaster::sendChangeMessage()
{
if (changeListeners.size() > 0)
callback.triggerAsyncUpdate();
}
void ChangeBroadcaster::sendSynchronousChangeMessage()
{
// This can only be called by the event thread.
jassert (MessageManager::getInstance()->isThisTheMessageThread());
callback.cancelPendingUpdate();
callListeners();
}
void ChangeBroadcaster::dispatchPendingMessages()
{
callback.handleUpdateNowIfNeeded();
}
void ChangeBroadcaster::callListeners()
{
changeListeners.call (&ChangeListener::changeListenerCallback, this);
}
//==============================================================================
ChangeBroadcaster::ChangeBroadcasterCallback::ChangeBroadcasterCallback()
: owner (nullptr)
{
}
void ChangeBroadcaster::ChangeBroadcasterCallback::handleAsyncUpdate()
{
jassert (owner != nullptr);
owner->callListeners();
}