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flightgear/utils/fgqcanvas/localprop.h

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//
// Copyright (C) 2017 James Turner zakalawe@mac.com
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program 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.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#ifndef LOCALPROP_H
#define LOCALPROP_H
#include <QByteArray>
#include <QVariant>
#include <QVector>
#include <QObject>
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#include <QDataStream>
struct NameIndexTuple
{
QByteArray name;
unsigned int index = 0;
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NameIndexTuple()
{}
NameIndexTuple(const char* nm, unsigned int idx) :
name(nm),
index(idx)
{}
NameIndexTuple(const QByteArray& bytes) :
name(bytes)
{
Q_ASSERT(bytes.indexOf('/') == -1);
if (bytes.endsWith(']')) {
int leftBracket = bytes.indexOf('[');
index = bytes.mid(leftBracket + 1, bytes.length() - (leftBracket + 2)).toInt();
name = bytes.left(leftBracket);
}
}
QByteArray toString() const
{
QByteArray p = name;
if (index > 0) {
p += '[' + QByteArray::number(index) + ']';
}
return p;
}
bool operator==(const NameIndexTuple& other) const
{
return (name == other.name) && (index == other.index);
}
bool operator<(const NameIndexTuple& other) const
{
if (name == other.name) {
return index < other.index;
}
return name < other.name;
}
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};
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QDataStream& operator<<(QDataStream& stream, const NameIndexTuple& nameIndex);
QDataStream& operator>>(QDataStream& stream, NameIndexTuple& nameIndex);
class LocalProp : public QObject
{
Q_OBJECT
public:
LocalProp(LocalProp* parent, const NameIndexTuple& ni);
virtual ~LocalProp();
void processChange(QJsonValue newValue);
const NameIndexTuple& id() const;
QByteArray path() const;
LocalProp* getOrCreateWithPath(const QByteArray& path);
LocalProp* childWithNameAndIndex(const NameIndexTuple& ni) const;
LocalProp* getOrCreateChildWithNameAndIndex(const NameIndexTuple& ni);
LocalProp* getOrCreateWithPath(const char* name);
LocalProp* getWithPath(const QByteArray& path) const;
LocalProp* getWithPath(const char* name) const;
QByteArray name() const;
unsigned int index() const;
/// position in the main FG propery tree. Normally
/// irrelevant but unfortunately necessary for correct
/// z-ordering of Canvas elements
unsigned int position() const
{
return _position;
}
void setPosition(unsigned int pos);
LocalProp* parent() const;
std::vector<LocalProp*> children() const
{ return _children; }
std::vector<QVariant> valuesOfChildren(const char* name) const;
std::vector<LocalProp*> childrenWithName(const char* name) const;
QVariant value() const;
QVariant value(const char* path, QVariant defaultValue) const;
void removeChild(LocalProp* prop);
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bool hasChild(const char* name) const;
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void changeValue(const char* path, QVariant value);
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void saveToStream(QDataStream& stream) const;
static LocalProp* restoreFromStream(QDataStream& stream, LocalProp *parent);
void recursiveNotifyRestored();
signals:
void valueChanged(QVariant val);
void childAdded(LocalProp* child);
void childRemoved(LocalProp* child);
private:
const NameIndexTuple _id;
const LocalProp* _parent;
std::vector<LocalProp*> _children;
QVariant _value;
unsigned int _position = 0;
};
#endif // LOCALPROP_H