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juce_ValueTreeSynchroniser.cpp
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juce_ValueTreeSynchroniser.cpp
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/*
==============================================================================
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.
==============================================================================
*/
namespace ValueTreeSynchroniserHelpers
{
enum ChangeType
{
propertyChanged = 1,
fullSync = 2,
childAdded = 3,
childRemoved = 4,
childMoved = 5
};
static void getValueTreePath (ValueTree v, const ValueTree& topLevelTree, Array<int>& path)
{
while (v != topLevelTree)
{
ValueTree parent (v.getParent());
if (! parent.isValid())
break;
path.add (parent.indexOf (v));
v = parent;
}
}
static void writeHeader (MemoryOutputStream& stream, ChangeType type)
{
stream.writeByte ((char) type);
}
static void writeHeader (ValueTreeSynchroniser& target, MemoryOutputStream& stream,
ChangeType type, ValueTree v)
{
writeHeader (stream, type);
Array<int> path;
getValueTreePath (v, target.getRoot(), path);
stream.writeCompressedInt (path.size());
for (int i = path.size(); --i >= 0;)
stream.writeCompressedInt (path.getUnchecked(i));
}
static ValueTree readSubTreeLocation (MemoryInputStream& input, ValueTree v)
{
const int numLevels = input.readCompressedInt();
if (! isPositiveAndBelow (numLevels, 65536)) // sanity-check
return ValueTree();
for (int i = numLevels; --i >= 0;)
{
const int index = input.readCompressedInt();
if (! isPositiveAndBelow (index, v.getNumChildren()))
return ValueTree();
v = v.getChild (index);
}
return v;
}
}
ValueTreeSynchroniser::ValueTreeSynchroniser (const ValueTree& tree) : valueTree (tree)
{
valueTree.addListener (this);
}
ValueTreeSynchroniser::~ValueTreeSynchroniser()
{
valueTree.removeListener (this);
}
void ValueTreeSynchroniser::sendFullSyncCallback()
{
MemoryOutputStream m;
writeHeader (m, ValueTreeSynchroniserHelpers::fullSync);
valueTree.writeToStream (m);
stateChanged (m.getData(), m.getDataSize());
}
void ValueTreeSynchroniser::valueTreePropertyChanged (ValueTree& vt, const Identifier& property)
{
MemoryOutputStream m;
ValueTreeSynchroniserHelpers::writeHeader (*this, m, ValueTreeSynchroniserHelpers::propertyChanged, vt);
m.writeString (property.toString());
vt.getProperty (property).writeToStream (m);
stateChanged (m.getData(), m.getDataSize());
}
void ValueTreeSynchroniser::valueTreeChildAdded (ValueTree& parentTree, ValueTree& childTree)
{
const int index = parentTree.indexOf (childTree);
jassert (index >= 0);
MemoryOutputStream m;
ValueTreeSynchroniserHelpers::writeHeader (*this, m, ValueTreeSynchroniserHelpers::childAdded, parentTree);
m.writeCompressedInt (index);
childTree.writeToStream (m);
stateChanged (m.getData(), m.getDataSize());
}
void ValueTreeSynchroniser::valueTreeChildRemoved (ValueTree& parentTree, ValueTree&, int oldIndex)
{
MemoryOutputStream m;
ValueTreeSynchroniserHelpers::writeHeader (*this, m, ValueTreeSynchroniserHelpers::childRemoved, parentTree);
m.writeCompressedInt (oldIndex);
stateChanged (m.getData(), m.getDataSize());
}
void ValueTreeSynchroniser::valueTreeChildOrderChanged (ValueTree& parent, int oldIndex, int newIndex)
{
MemoryOutputStream m;
ValueTreeSynchroniserHelpers::writeHeader (*this, m, ValueTreeSynchroniserHelpers::childMoved, parent);
m.writeCompressedInt (oldIndex);
m.writeCompressedInt (newIndex);
stateChanged (m.getData(), m.getDataSize());
}
void ValueTreeSynchroniser::valueTreeParentChanged (ValueTree&) {} // (No action needed here)
bool ValueTreeSynchroniser::applyChange (ValueTree& root, const void* data, size_t dataSize, UndoManager* undoManager)
{
MemoryInputStream input (data, dataSize, false);
const ValueTreeSynchroniserHelpers::ChangeType type = (ValueTreeSynchroniserHelpers::ChangeType) input.readByte();
if (type == ValueTreeSynchroniserHelpers::fullSync)
{
root = ValueTree::readFromStream (input);
return true;
}
ValueTree v (ValueTreeSynchroniserHelpers::readSubTreeLocation (input, root));
if (! v.isValid())
return false;
switch (type)
{
case ValueTreeSynchroniserHelpers::propertyChanged:
{
Identifier property (input.readString());
v.setProperty (property, var::readFromStream (input), undoManager);
return true;
}
case ValueTreeSynchroniserHelpers::childAdded:
{
const int index = input.readCompressedInt();
v.addChild (ValueTree::readFromStream (input), index, undoManager);
return true;
}
case ValueTreeSynchroniserHelpers::childRemoved:
{
const int index = input.readCompressedInt();
if (isPositiveAndBelow (index, v.getNumChildren()))
{
v.removeChild (index, undoManager);
return true;
}
jassertfalse; // Either received some corrupt data, or the trees have drifted out of sync
break;
}
case ValueTreeSynchroniserHelpers::childMoved:
{
const int oldIndex = input.readCompressedInt();
const int newIndex = input.readCompressedInt();
if (isPositiveAndBelow (oldIndex, v.getNumChildren())
&& isPositiveAndBelow (newIndex, v.getNumChildren()))
{
v.moveChild (oldIndex, newIndex, undoManager);
return true;
}
jassertfalse; // Either received some corrupt data, or the trees have drifted out of sync
break;
}
default:
jassertfalse; // Seem to have received some corrupt data?
break;
}
return false;
}