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105 lines
3.7 KiB
105 lines
3.7 KiB
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2015 - ROLI Ltd.
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Permission is granted to use this software under the terms of either:
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a) the GPL v2 (or any later version)
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b) the Affero GPL v3
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Details of these licenses can be found at: www.gnu.org/licenses
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.juce.com for more information.
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==============================================================================
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*/
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#ifndef JUCE_CHANGEBROADCASTER_H_INCLUDED
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#define JUCE_CHANGEBROADCASTER_H_INCLUDED
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//==============================================================================
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/**
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Holds a list of ChangeListeners, and sends messages to them when instructed.
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@see ChangeListener
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*/
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class JUCE_API ChangeBroadcaster
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{
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public:
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//==============================================================================
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/** Creates an ChangeBroadcaster. */
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ChangeBroadcaster() noexcept;
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/** Destructor. */
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virtual ~ChangeBroadcaster();
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//==============================================================================
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/** Registers a listener to receive change callbacks from this broadcaster.
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Trying to add a listener that's already on the list will have no effect.
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*/
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void addChangeListener (ChangeListener* listener);
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/** Unregisters a listener from the list.
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If the listener isn't on the list, this won't have any effect.
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*/
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void removeChangeListener (ChangeListener* listener);
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/** Removes all listeners from the list. */
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void removeAllChangeListeners();
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//==============================================================================
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/** Causes an asynchronous change message to be sent to all the registered listeners.
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The message will be delivered asynchronously by the main message thread, so this
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method will return immediately. To call the listeners synchronously use
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sendSynchronousChangeMessage().
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*/
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void sendChangeMessage();
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/** Sends a synchronous change message to all the registered listeners.
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This will immediately call all the listeners that are registered. For thread-safety
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reasons, you must only call this method on the main message thread.
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@see dispatchPendingMessages
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*/
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void sendSynchronousChangeMessage();
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/** If a change message has been sent but not yet dispatched, this will call
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sendSynchronousChangeMessage() to make the callback immediately.
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For thread-safety reasons, you must only call this method on the main message thread.
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*/
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void dispatchPendingMessages();
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private:
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//==============================================================================
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class ChangeBroadcasterCallback : public AsyncUpdater
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{
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public:
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ChangeBroadcasterCallback();
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void handleAsyncUpdate() override;
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ChangeBroadcaster* owner;
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};
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friend class ChangeBroadcasterCallback;
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ChangeBroadcasterCallback broadcastCallback;
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ListenerList <ChangeListener> changeListeners;
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void callListeners();
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JUCE_DECLARE_NON_COPYABLE (ChangeBroadcaster)
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};
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#endif // JUCE_CHANGEBROADCASTER_H_INCLUDED
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