OpenShot Library | libopenshot-audio
0.2.0
juce_ChangeListener.h
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/** @weakgroup juce_events-broadcasters
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* @{
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*/
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace
juce
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{
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class
ChangeBroadcaster;
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//==============================================================================
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/**
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Receives change event callbacks that are sent out by a ChangeBroadcaster.
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A ChangeBroadcaster keeps a set of listeners to which it broadcasts a message when
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the ChangeBroadcaster::sendChangeMessage() method is called. A subclass of
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ChangeListener is used to receive these callbacks.
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Note that the major difference between an ActionListener and a ChangeListener
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is that for a ChangeListener, multiple changes will be coalesced into fewer
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callbacks, but ActionListeners perform one callback for every event posted.
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@see ChangeBroadcaster, ActionListener
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@tags{Events}
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*/
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class
JUCE_API
ChangeListener
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{
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public
:
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/** Destructor. */
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virtual
~
ChangeListener
() =
default
;
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/** Your subclass should implement this method to receive the callback.
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@param source the ChangeBroadcaster that triggered the callback.
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*/
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virtual
void
changeListenerCallback (
ChangeBroadcaster
* source) = 0;
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//==============================================================================
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#if JUCE_CATCH_DEPRECATED_CODE_MISUSE
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// This method's signature has changed to take a ChangeBroadcaster parameter - please update your code!
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private
:
virtual
int
changeListenerCallback (
void
*) {
return
0; }
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#endif
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};
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}
// namespace juce
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/** @}*/
JUCE_API
#define JUCE_API
This macro is added to all JUCE public class declarations.
Definition:
juce_StandardHeader.h:143
juce::ChangeListener
Receives change event callbacks that are sent out by a ChangeBroadcaster.
Definition:
juce_ChangeListener.h:48
juce::ChangeBroadcaster
Holds a list of ChangeListeners, and sends messages to them when instructed.
Definition:
juce_ChangeBroadcaster.h:38
juce_events
broadcasters
juce_ChangeListener.h
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