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 
23 namespace juce
24 {
25 
27 {
28 public:
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 
43 private:
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 
84 void ActionBroadcaster::sendActionMessage (const String& message) const
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
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.
ActionBroadcaster()
Creates an ActionBroadcaster.
The JUCE String class!
Definition: juce_String.h:42
void sendActionMessage(const String &message) const
Broadcasts a message to all the registered listeners.
void addActionListener(ActionListener *listener)
Adds a listener to the list.
void removeActionListener(ActionListener *listener)
Removes a listener from the list.
virtual ~ActionBroadcaster()
Destructor.
This class acts as a pointer which will automatically become null if the object to which it points is...
Automatically locks and unlocks a mutex object.
void removeAllActionListeners()
Removes all listeners from the list.
Manages a list of ActionListeners, and can send them messages.
Internal class used as the base class for all message objects.