OpenShot Library | libopenshot-audio 0.2.0
juce_ChangeBroadcaster.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{
28 broadcastCallback.owner = this;
29}
30
34
36{
37 // Listeners can only be safely added when the event thread is locked
38 // You can use a MessageManagerLock if you need to call this from another thread.
39 JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED
40
41 changeListeners.add (listener);
42}
43
45{
46 // Listeners can only be safely removed when the event thread is locked
47 // You can use a MessageManagerLock if you need to call this from another thread.
48 JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED
49
50 changeListeners.remove (listener);
51}
52
54{
55 // Listeners can only be safely removed when the event thread is locked
56 // You can use a MessageManagerLock if you need to call this from another thread.
57 JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED
58
59 changeListeners.clear();
60}
61
63{
64 if (changeListeners.size() > 0)
65 broadcastCallback.triggerAsyncUpdate();
66}
67
69{
70 // This can only be called by the event thread.
71 JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED
72
73 broadcastCallback.cancelPendingUpdate();
74 callListeners();
75}
76
78{
79 broadcastCallback.handleUpdateNowIfNeeded();
80}
81
82void ChangeBroadcaster::callListeners()
83{
84 changeListeners.call ([this] (ChangeListener& l) { l.changeListenerCallback (this); });
85}
86
87//==============================================================================
88ChangeBroadcaster::ChangeBroadcasterCallback::ChangeBroadcasterCallback()
89 : owner (nullptr)
90{
91}
92
93void ChangeBroadcaster::ChangeBroadcasterCallback::handleAsyncUpdate()
94{
95 jassert (owner != nullptr);
96 owner->callListeners();
97}
98
99} // namespace juce
Holds a resizable array of primitive or copy-by-value objects.
Definition juce_Array.h:60
int size() const noexcept
Returns the current number of elements in the array.
Definition juce_Array.h:219
void remove(int indexToRemove)
Removes an element from the array.
Definition juce_Array.h:724
void add(const ElementType &newElement)
Appends a new element at the end of the array.
Definition juce_Array.h:375
void clear()
Removes all elements from the array.
Definition juce_Array.h:192
void sendChangeMessage()
Causes an asynchronous change message to be sent to all the registered listeners.
virtual ~ChangeBroadcaster()
Destructor.
ChangeBroadcaster() noexcept
Creates an ChangeBroadcaster.
void addChangeListener(ChangeListener *listener)
Registers a listener to receive change callbacks from this broadcaster.
void removeChangeListener(ChangeListener *listener)
Unregisters a listener from the list.
void removeAllChangeListeners()
Removes all listeners from the list.
void sendSynchronousChangeMessage()
Sends a synchronous change message to all the registered listeners.
void dispatchPendingMessages()
If a change message has been sent but not yet dispatched, this will call sendSynchronousChangeMessage...
Receives change event callbacks that are sent out by a ChangeBroadcaster.