- clean working copy for leaving SVN

juce/JUCE-3.1.1/modules/juce_data_structures/values/juce_Value.cpp

@@ -0,0 +1,237 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2013 - Raw Material Software Ltd.
+
+   Permission is granted to use this software under the terms of either:
+   a) the GPL v2 (or any later version)
+   b) the Affero GPL v3
+
+   Details of these licenses can be found at: www.gnu.org/licenses
+
+   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+   ------------------------------------------------------------------------------
+
+   To release a closed-source product which uses JUCE, commercial licenses are
+   available: visit www.juce.com for more information.
+
+  ==============================================================================
+*/
+
+Value::ValueSource::ValueSource()
+{
+}
+
+Value::ValueSource::~ValueSource()
+{
+    cancelPendingUpdate();
+}
+
+void Value::ValueSource::handleAsyncUpdate()
+{
+    sendChangeMessage (true);
+}
+
+void Value::ValueSource::sendChangeMessage (const bool synchronous)
+{
+    const int numListeners = valuesWithListeners.size();
+
+    if (numListeners > 0)
+    {
+        if (synchronous)
+        {
+            const ReferenceCountedObjectPtr<ValueSource> localRef (this);
+
+            cancelPendingUpdate();
+
+            for (int i = numListeners; --i >= 0;)
+                if (Value* const v = valuesWithListeners[i])
+                    v->callListeners();
+        }
+        else
+        {
+            triggerAsyncUpdate();
+        }
+    }
+}
+
+//==============================================================================
+class SimpleValueSource  : public Value::ValueSource
+{
+public:
+    SimpleValueSource()
+    {
+    }
+
+    SimpleValueSource (const var& initialValue)
+        : value (initialValue)
+    {
+    }
+
+    var getValue() const
+    {
+        return value;
+    }
+
+    void setValue (const var& newValue)
+    {
+        if (! newValue.equalsWithSameType (value))
+        {
+            value = newValue;
+            sendChangeMessage (false);
+        }
+    }
+
+private:
+    var value;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SimpleValueSource)
+};
+
+
+//==============================================================================
+Value::Value()  : value (new SimpleValueSource())
+{
+}
+
+Value::Value (ValueSource* const v)  : value (v)
+{
+    jassert (v != nullptr);
+}
+
+Value::Value (const var& initialValue)  : value (new SimpleValueSource (initialValue))
+{
+}
+
+Value::Value (const Value& other)  : value (other.value)
+{
+}
+
+#if JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS
+Value::Value (Value&& other) noexcept
+{
+    // moving a Value with listeners will lose those listeners, which
+    // probably isn't what you wanted to happen!
+    jassert (other.listeners.size() == 0);
+
+    other.removeFromListenerList();
+    value = static_cast<ReferenceCountedObjectPtr<ValueSource>&&> (other.value);
+}
+
+Value& Value::operator= (Value&& other) noexcept
+{
+    // moving a Value with listeners will lose those listeners, which
+    // probably isn't what you wanted to happen!
+    jassert (other.listeners.size() == 0);
+
+    other.removeFromListenerList();
+    value = static_cast<ReferenceCountedObjectPtr<ValueSource>&&> (other.value);
+    return *this;
+}
+#endif
+
+Value::~Value()
+{
+    removeFromListenerList();
+}
+
+void Value::removeFromListenerList()
+{
+    if (listeners.size() > 0 && value != nullptr) // may be nullptr after a move operation
+        value->valuesWithListeners.removeValue (this);
+}
+
+//==============================================================================
+var Value::getValue() const
+{
+    return value->getValue();
+}
+
+Value::operator var() const
+{
+    return value->getValue();
+}
+
+void Value::setValue (const var& newValue)
+{
+    value->setValue (newValue);
+}
+
+String Value::toString() const
+{
+    return value->getValue().toString();
+}
+
+Value& Value::operator= (const var& newValue)
+{
+    value->setValue (newValue);
+    return *this;
+}
+
+void Value::referTo (const Value& valueToReferTo)
+{
+    if (valueToReferTo.value != value)
+    {
+        if (listeners.size() > 0)
+        {
+            value->valuesWithListeners.removeValue (this);
+            valueToReferTo.value->valuesWithListeners.add (this);
+        }
+
+        value = valueToReferTo.value;
+        callListeners();
+    }
+}
+
+bool Value::refersToSameSourceAs (const Value& other) const
+{
+    return value == other.value;
+}
+
+bool Value::operator== (const Value& other) const
+{
+    return value == other.value || value->getValue() == other.getValue();
+}
+
+bool Value::operator!= (const Value& other) const
+{
+    return value != other.value && value->getValue() != other.getValue();
+}
+
+//==============================================================================
+void Value::addListener (ValueListener* const listener)
+{
+    if (listener != nullptr)
+    {
+        if (listeners.size() == 0)
+            value->valuesWithListeners.add (this);
+
+        listeners.add (listener);
+    }
+}
+
+void Value::removeListener (ValueListener* const listener)
+{
+    listeners.remove (listener);
+
+    if (listeners.size() == 0)
+        value->valuesWithListeners.removeValue (this);
+}
+
+void Value::callListeners()
+{
+    if (listeners.size() > 0)
+    {
+        Value v (*this); // (create a copy in case this gets deleted by a callback)
+        listeners.call (&ValueListener::valueChanged, v);
+    }
+}
+
+OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const Value& value)
+{
+    return stream << value.toString();
+}