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juce_Value.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 By using JUCE, you agree to the terms of both the JUCE 5 End-User License
11 Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
12 27th April 2017).
13
14 End User License Agreement: www.juce.com/juce-5-licence
15 Privacy Policy: www.juce.com/juce-5-privacy-policy
16
17 Or: You may also use this code under the terms of the GPL v3 (see
18 www.gnu.org/licenses).
19
20 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
21 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
22 DISCLAIMED.
23
24 ==============================================================================
25*/
26
27 namespace juce
28{
29
30Value::ValueSource::ValueSource()
31{
32}
33
34Value::ValueSource::~ValueSource()
35{
36 cancelPendingUpdate();
37}
38
39 void Value::ValueSource::handleAsyncUpdate()
40{
41 sendChangeMessage (true);
42}
43
44 void Value::ValueSource::sendChangeMessage (const bool synchronous)
45{
46 const int numListeners = valuesWithListeners.size();
47
48 if (numListeners > 0)
49 {
50 if (synchronous)
51 {
52 const ReferenceCountedObjectPtr<ValueSource> localRef (this);
53
54 cancelPendingUpdate();
55
56 for (int i = numListeners; --i >= 0;)
57 if (Value* const v = valuesWithListeners[i])
58 v->callListeners();
59 }
60 else
61 {
62 triggerAsyncUpdate();
63 }
64 }
65}
66
67//==============================================================================
68 class SimpleValueSource : public Value::ValueSource
69{
70 public:
71 SimpleValueSource()
72 {
73 }
74
75 SimpleValueSource (const var& initialValue)
76 : value (initialValue)
77 {
78 }
79
80 var getValue() const override
81 {
82 return value;
83 }
84
85 void setValue (const var& newValue) override
86 {
87 if (! newValue.equalsWithSameType (value))
88 {
89 value = newValue;
90 sendChangeMessage (false);
91 }
92 }
93
94 private:
95 var value;
96
97 JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SimpleValueSource)
98};
99
100
101//==============================================================================
102 Value::Value() : value (new SimpleValueSource())
103{
104}
105
106 Value::Value (ValueSource* const v) : value (v)
107{
108 jassert (v != nullptr);
109}
110
111 Value::Value (const var& initialValue) : value (new SimpleValueSource (initialValue))
112{
113}
114
115 Value::Value (const Value& other) : value (other.value)
116{
117}
118
119 Value::Value (Value&& other) noexcept
120{
121 // moving a Value with listeners will lose those listeners, which
122 // probably isn't what you wanted to happen!
123 jassert (other.listeners.size() == 0);
124
125 other.removeFromListenerList();
126 value = std::move (other.value);
127}
128
129 Value& Value::operator= (Value&& other) noexcept
130{
131 // moving a Value with listeners will lose those listeners, which
132 // probably isn't what you wanted to happen!
133 jassert (other.listeners.size() == 0);
134
135 other.removeFromListenerList();
136 value = std::move (other.value);
137 return *this;
138}
139
140 Value::~Value()
141{
142 removeFromListenerList();
143}
144
145 void Value::removeFromListenerList()
146{
147 if (listeners.size() > 0 && value != nullptr) // may be nullptr after a move operation
148 value->valuesWithListeners.removeValue (this);
149}
150
151//==============================================================================
152 var Value::getValue() const
153{
154 return value->getValue();
155}
156
157Value::operator var() const
158{
159 return value->getValue();
160}
161
162 void Value::setValue (const var& newValue)
163{
164 value->setValue (newValue);
165}
166
167 String Value::toString() const
168{
169 return value->getValue().toString();
170}
171
172 Value& Value::operator= (const var& newValue)
173{
174 value->setValue (newValue);
175 return *this;
176}
177
178 void Value::referTo (const Value& valueToReferTo)
179{
180 if (valueToReferTo.value != value)
181 {
182 if (listeners.size() > 0)
183 {
184 value->valuesWithListeners.removeValue (this);
185 valueToReferTo.value->valuesWithListeners.add (this);
186 }
187
188 value = valueToReferTo.value;
189 callListeners();
190 }
191}
192
193 bool Value::refersToSameSourceAs (const Value& other) const
194{
195 return value == other.value;
196}
197
198 bool Value::operator== (const Value& other) const
199{
200 return value == other.value || value->getValue() == other.getValue();
201}
202
203 bool Value::operator!= (const Value& other) const
204{
205 return value != other.value && value->getValue() != other.getValue();
206}
207
208//==============================================================================
209 void Value::addListener (Value::Listener* listener)
210{
211 if (listener != nullptr)
212 {
213 if (listeners.size() == 0)
214 value->valuesWithListeners.add (this);
215
216 listeners.add (listener);
217 }
218}
219
220 void Value::removeListener (Value::Listener* listener)
221{
222 listeners.remove (listener);
223
224 if (listeners.size() == 0)
225 value->valuesWithListeners.removeValue (this);
226}
227
228 void Value::callListeners()
229{
230 if (listeners.size() > 0)
231 {
232 Value v (*this); // (create a copy in case this gets deleted by a callback)
233 listeners.call ([&] (Value::Listener& l) { l.valueChanged (v); });
234 }
235}
236
237OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const Value& value)
238{
239 return stream << value.toString();
240}
241
242} // namespace juce
juce::ReferenceCountedObjectPtr
Definition: juce_ReferenceCountedObject.h:247
juce::String
Definition: juce_String.h:39
juce::Value::Listener
Definition: juce_Value.h:139
juce::Value::Listener::valueChanged
virtual void valueChanged(Value &value)=0
juce::Value::ValueSource
Definition: juce_Value.h:180
juce::Value::ValueSource::sendChangeMessage
void sendChangeMessage(bool dispatchSynchronously)
Definition: juce_Value.cpp:44
juce::Value
Definition: juce_Value.h:52
juce::Value::operator==
bool operator==(const Value &other) const
Definition: juce_Value.cpp:198
juce::Value::setValue
void setValue(const var &newValue)
Definition: juce_Value.cpp:162
juce::Value::addListener
void addListener(Listener *listener)
Definition: juce_Value.cpp:209
juce::Value::removeListener
void removeListener(Listener *listener)
Definition: juce_Value.cpp:220
juce::Value::refersToSameSourceAs
bool refersToSameSourceAs(const Value &other) const
Definition: juce_Value.cpp:193
juce::Value::operator=
Value & operator=(const var &newValue)
Definition: juce_Value.cpp:172
juce::Value::referTo
void referTo(const Value &valueToReferTo)
Definition: juce_Value.cpp:178
juce::Value::~Value
~Value()
Definition: juce_Value.cpp:140
juce::Value::Value
Value()
Definition: juce_Value.cpp:102
juce::Value::getValue
var getValue() const
Definition: juce_Value.cpp:152
juce::Value::operator!=
bool operator!=(const Value &other) const
Definition: juce_Value.cpp:203
juce::Value::toString
String toString() const
Definition: juce_Value.cpp:167
juce::var
Definition: juce_Variant.h:42