OpenShot Library | OpenShotAudio 0.2.2
juce_ActionBroadcaster.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2017 - ROLI Ltd.
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23namespace juce
24{
25
27{
28public:
30 const String& messageText, ActionListener* l) noexcept
31 : broadcaster (const_cast<ActionBroadcaster*> (ab)),
32 message (messageText),
33 listener (l)
34 {}
35
36 void messageCallback() override
37 {
38 if (auto b = broadcaster.get())
39 if (b->actionListeners.contains (listener))
40 listener->actionListenerCallback (message);
41 }
42
43private:
45 const String message;
46 ActionListener* const listener;
47
48 JUCE_DECLARE_NON_COPYABLE (ActionMessage)
49};
50
51//==============================================================================
53{
54 // are you trying to create this object before or after juce has been initialised??
55 JUCE_ASSERT_MESSAGE_MANAGER_EXISTS
56}
57
59{
60 // all event-based objects must be deleted BEFORE juce is shut down!
61 JUCE_ASSERT_MESSAGE_MANAGER_EXISTS
62}
63
65{
66 const ScopedLock sl (actionListenerLock);
67
68 if (listener != nullptr)
69 actionListeners.add (listener);
70}
71
73{
74 const ScopedLock sl (actionListenerLock);
75 actionListeners.removeValue (listener);
76}
77
79{
80 const ScopedLock sl (actionListenerLock);
81 actionListeners.clear();
82}
83
85{
86 const ScopedLock sl (actionListenerLock);
87
88 for (int i = actionListeners.size(); --i >= 0;)
89 (new ActionMessage (this, message, actionListeners.getUnchecked(i)))->post();
90}
91
92} // namespace juce
Manages a list of ActionListeners, and can send them messages.
void removeActionListener(ActionListener *listener)
Removes a listener from the list.
ActionBroadcaster()
Creates an ActionBroadcaster.
void addActionListener(ActionListener *listener)
Adds a listener to the list.
virtual ~ActionBroadcaster()
Destructor.
void removeAllActionListeners()
Removes all listeners from the list.
void sendActionMessage(const String &message) const
Broadcasts a message to all the registered listeners.
Interface class for delivery of events that are sent by an ActionBroadcaster.
virtual void actionListenerCallback(const String &message)=0
Overridden by your subclass to receive the callback.
Automatically locks and unlocks a mutex object.
Internal class used as the base class for all message objects.
The JUCE String class!
Definition: juce_String.h:43
This class acts as a pointer which will automatically become null if the object to which it points is...