QItemEditorFactory for QList.

[hickscorp]

Hello everyone,

i'm facing a problem for which i'm not finding any solution... i've tried pretty much everything, but i believe i may not understand something in the required logic here.
My project has reached a certain complexity point "code" speaking, and it's hard to provide all the relevant source code since everything depends on a lot of other stuff.

Basically, i have defined custom types:

// File is being Moc'ed.
 
namespace REA {
	class	IntList					: public QList<qint32>										{};
	class	UIntList				: public QList<quint32>										{};
	class	RgbList					: public QList<QRgb>										{};
	class	StringList				: public QStringList										{};
	class	CharList				: public QList<QChar>										{};
	class	RgbToUIntHash			: public QHash<QRgb,quint32>								{};
	class	StringToStringHash		: public QHash<QString,QString>								{};
	class	StringToImageHash		: public QHash<QString,QImage>								{};
// And a lot more types...
 
	// -------------------------------------	Rectangles				------------------------------------- //
	// Rectangle.
	class	Rect					: public QRect												{
	public:
		// Members.
		bool						isRelative;
		// Constructors.
		Rect	(QPoint const &p=QPoint(0,0), QSize const &s=QSize(0,0), bool r=false)
			: QRect(p, s), isRelative(r)														{};
		// QDataStream friend serialization stuff.
		friend QDataStream&			operator<<		(QDataStream& s, Rect const &r)				{ return s << *(QRect*)&r << r.isRelative; };
		friend QDataStream&			operator>>		(QDataStream& s, Rect &r)					{ return s >> *(QRect*)&r >> r.isRelative; };
	};
	// Float rectangle.
	class	RectF					: public QRectF												{
	public:
		// Members.
		bool						isRelative;
		// Constructors.
		RectF	(QPointF const &p=QPointF(0,0), QSizeF const &s=QSizeF(0,0), bool r=false)
			: QRectF(p, s), isRelative(r) {};
		// QDataStream friend serialization stuff.
		friend QDataStream&			operator<<		(QDataStream& s, RectF const &r)			{ return s << *(QRectF*)&r << r.isRelative; };
		friend QDataStream&			operator>>		(QDataStream& s, RectF &r)					{ return s >> *(QRectF*)&r >> r.isRelative; };
	};
// And a lot more custom types...
};
Q_DECLARE_METATYPE(REA::IntList);
Q_DECLARE_METATYPE(REA::UIntList);
Q_DECLARE_METATYPE(REA::RgbList);
Q_DECLARE_METATYPE(REA::StringList);
Q_DECLARE_METATYPE(REA::CharList);
Q_DECLARE_METATYPE(REA::RgbToUIntHash);
Q_DECLARE_METATYPE(REA::StringToStringHash);
Q_DECLARE_METATYPE(REA::StringToImageHash);
Q_DECLARE_METATYPE(REA::Rect);
Q_DECLARE_METATYPE(REA::RectF);
// And the same for any other type...

// File is being Moc'ed.

namespace REA {
	class	IntList					: public QList<qint32>										{};
	class	UIntList				: public QList<quint32>										{};
	class	RgbList					: public QList<QRgb>										{};
	class	StringList				: public QStringList										{};
	class	CharList				: public QList<QChar>										{};
	class	RgbToUIntHash			: public QHash<QRgb,quint32>								{};
	class	StringToStringHash		: public QHash<QString,QString>								{};
	class	StringToImageHash		: public QHash<QString,QImage>								{};
// And a lot more types...

	// -------------------------------------	Rectangles				------------------------------------- //
	// Rectangle.
	class	Rect					: public QRect												{
	public:
		// Members.
		bool						isRelative;
		// Constructors.
		Rect	(QPoint const &p=QPoint(0,0), QSize const &s=QSize(0,0), bool r=false)
			: QRect(p, s), isRelative(r)														{};
		// QDataStream friend serialization stuff.
		friend QDataStream&			operator<<		(QDataStream& s, Rect const &r)				{ return s << *(QRect*)&r << r.isRelative; };
		friend QDataStream&			operator>>		(QDataStream& s, Rect &r)					{ return s >> *(QRect*)&r >> r.isRelative; };
	};
	// Float rectangle.
	class	RectF					: public QRectF												{
	public:
		// Members.
		bool						isRelative;
		// Constructors.
		RectF	(QPointF const &p=QPointF(0,0), QSizeF const &s=QSizeF(0,0), bool r=false)
			: QRectF(p, s), isRelative(r) {};
		// QDataStream friend serialization stuff.
		friend QDataStream&			operator<<		(QDataStream& s, RectF const &r)			{ return s << *(QRectF*)&r << r.isRelative; };
		friend QDataStream&			operator>>		(QDataStream& s, RectF &r)					{ return s >> *(QRectF*)&r >> r.isRelative; };
	};
// And a lot more custom types...
};
Q_DECLARE_METATYPE(REA::IntList);
Q_DECLARE_METATYPE(REA::UIntList);
Q_DECLARE_METATYPE(REA::RgbList);
Q_DECLARE_METATYPE(REA::StringList);
Q_DECLARE_METATYPE(REA::CharList);
Q_DECLARE_METATYPE(REA::RgbToUIntHash);
Q_DECLARE_METATYPE(REA::StringToStringHash);
Q_DECLARE_METATYPE(REA::StringToImageHash);
Q_DECLARE_METATYPE(REA::Rect);
Q_DECLARE_METATYPE(REA::RectF);
// And the same for any other type...

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Then at runtime, i register everything:

#define RegisterStreamOperators(name)	qRegisterMetaTypeStreamOperators<name>(#name)
// Register lists / maps / hashes meta-types for streaming.
RegisterStreamOperators(REA::IntList);
RegisterStreamOperators(REA::UIntList);
RegisterStreamOperators(REA::RgbList);
RegisterStreamOperators(REA::StringList);
RegisterStreamOperators(REA::CharList);
RegisterStreamOperators(REA::RgbToUIntHash);
RegisterStreamOperators(REA::StringToStringHash);
RegisterStreamOperators(REA::StringToImageHash);
RegisterStreamOperators(REA::Rect);
RegisterStreamOperators(REA::RectF);
#undef RegisterStreamOperators

#define RegisterStreamOperators(name)	qRegisterMetaTypeStreamOperators<name>(#name)
// Register lists / maps / hashes meta-types for streaming.
RegisterStreamOperators(REA::IntList);
RegisterStreamOperators(REA::UIntList);
RegisterStreamOperators(REA::RgbList);
RegisterStreamOperators(REA::StringList);
RegisterStreamOperators(REA::CharList);
RegisterStreamOperators(REA::RgbToUIntHash);
RegisterStreamOperators(REA::StringToStringHash);
RegisterStreamOperators(REA::StringToImageHash);
RegisterStreamOperators(REA::Rect);
RegisterStreamOperators(REA::RectF);
#undef RegisterStreamOperators

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Then, i have this very special class called "Variable", which acts a very similar way as QVariant does (It actually uses a QVariant internally). The Variable class allows me to define an i/o direction for a value, a name, and defines streaming operators to save / load lists of variables.

Then on my GUI project, i have subclassed QItemEditorFactory to allow me to dynamically instantiate editors based on the type of variable being edited:

#include "CustomItemEditorFactory.h"
// Editor classes.
#include "REATypes.h"
// Basic types.
#include <QLineEdit>
// Custom types.
#include "WgtBoolEditor.h"
#include "WgtPointEditor.h"
#include "WgtPointFEditor.h"
#include "WgtSizeEditor.h"
#include "WgtSizeFEditor.h"
#include "WgtRectEditor.h"
#include "WgtRectFEditor.h"
#include "WgtWFNodeUidEditor.h"
#include "WgtMemberPicker.h"
 
using namespace REA;
 
CustomItemEditorFactory::CustomItemEditorFactory (const QItemEditorFactory* standardFactory)
: QItemEditorFactory(), _standardFactory(standardFactory) {
}
 
QWidget* CustomItemEditorFactory::createEditor (QVariant::Type type, QWidget* parent) const {
	switch (type) {
		case QVariant::String:										return new QLineEdit(parent);
		case QVariant::Bool:										return new WgtBoolEditor(parent);
		case QVariant::Point:										return new WgtPointEditor(parent);
		case QVariant::PointF:										return new WgtPointFEditor(parent);
		case QVariant::Size:										return new WgtSizeEditor(parent);
		case QVariant::SizeF:										return new WgtSizeEditor(parent);
		default:
			if	(type==qMetaTypeId<REA::Rect>())					return new WgtRectEditor(parent);
			else if	(type==qMetaTypeId<REA::RectF>())				return new WgtRectFEditor(parent);
			else if	(type==qMetaTypeId<REA::UniqueIdentifier>())	return new WgtWFNodeUidEditor(parent);
			else if	(type==qMetaTypeId<REA::MemberPath>())			return new WgtMemberPicker(parent);
			else													return _standardFactory->createEditor(type, parent);
	};
}
 
QByteArray CustomItemEditorFactory::valuePropertyName (QVariant::Type type) const {
	// Any custom type...
	if (	type==QVariant::Bool ||
			type==QVariant::Point || type==QVariant::PointF ||
			type==QVariant::Size || type==QVariant::SizeF ||
			type>=QVariant::UserType)
		return "value";
	else
		return _standardFactory->valuePropertyName(type);
}
 
void CustomItemEditorFactory::installAsStandardFactory () {
	QItemEditorFactory::setDefaultFactory(new CustomItemEditorFactory(QItemEditorFactory::defaultFactory()));
}

#include "CustomItemEditorFactory.h"
// Editor classes.
#include "REATypes.h"
// Basic types.
#include <QLineEdit>
// Custom types.
#include "WgtBoolEditor.h"
#include "WgtPointEditor.h"
#include "WgtPointFEditor.h"
#include "WgtSizeEditor.h"
#include "WgtSizeFEditor.h"
#include "WgtRectEditor.h"
#include "WgtRectFEditor.h"
#include "WgtWFNodeUidEditor.h"
#include "WgtMemberPicker.h"

using namespace REA;

CustomItemEditorFactory::CustomItemEditorFactory (const QItemEditorFactory* standardFactory)
: QItemEditorFactory(), _standardFactory(standardFactory) {
}

QWidget* CustomItemEditorFactory::createEditor (QVariant::Type type, QWidget* parent) const {
	switch (type) {
		case QVariant::String:										return new QLineEdit(parent);
		case QVariant::Bool:										return new WgtBoolEditor(parent);
		case QVariant::Point:										return new WgtPointEditor(parent);
		case QVariant::PointF:										return new WgtPointFEditor(parent);
		case QVariant::Size:										return new WgtSizeEditor(parent);
		case QVariant::SizeF:										return new WgtSizeEditor(parent);
		default:
			if	(type==qMetaTypeId<REA::Rect>())					return new WgtRectEditor(parent);
			else if	(type==qMetaTypeId<REA::RectF>())				return new WgtRectFEditor(parent);
			else if	(type==qMetaTypeId<REA::UniqueIdentifier>())	return new WgtWFNodeUidEditor(parent);
			else if	(type==qMetaTypeId<REA::MemberPath>())			return new WgtMemberPicker(parent);
			else													return _standardFactory->createEditor(type, parent);
	};
}

QByteArray CustomItemEditorFactory::valuePropertyName (QVariant::Type type) const {
	// Any custom type...
	if (	type==QVariant::Bool ||
			type==QVariant::Point || type==QVariant::PointF ||
			type==QVariant::Size || type==QVariant::SizeF ||
			type>=QVariant::UserType)
		return "value";
	else
		return _standardFactory->valuePropertyName(type);
}

void CustomItemEditorFactory::installAsStandardFactory () {
	QItemEditorFactory::setDefaultFactory(new CustomItemEditorFactory(QItemEditorFactory::defaultFactory()));
}

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All this works flawlessly, i have no problem doing something like:

WgtVariableEditor	*wgt	= new WgtVariableEditor(this, var);

WgtVariableEditor	*wgt	= new WgtVariableEditor(this, var);

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The Variable editor widget important part looks like that:

WgtVariableEditor::WgtVariableEditor (QWidget *parent, Variable const &var)
: QWidget(parent, 0), _widget(0), _variable(var) {
	// Create and set layout for this widget.
	QHBoxLayout	*lyt	= new QHBoxLayout(this);
	lyt->setSpacing(0);
	lyt->setMargin(0);
	setLayout(lyt);
 
	// Retrieve editor widget object.
	QItemEditorFactory const	*f	= QItemEditorFactory::defaultFactory();
 
	// Create the widget and store it's metaobject.
	_widget							= f->createEditor((QVariant::Type)_variable.value.userType(), this);
	lyt->addWidget(_widget);
 
	// Retrieve metaobject.
	QMetaObject const	*mo			= _widget->metaObject();
	// Retrieve value property name.
	QByteArray			vpName		= f->valuePropertyName((QVariant::Type)_variable.value.userType());
	// Set widget value.
	_widget->setProperty(vpName, _variable.value);
	// Get property index.
	int					pIndex		= mo->indexOfProperty(vpName);
	// Retrieve metamethod for notification signal.
	QMetaMethod			signal		= mo->property(pIndex).notifySignal();
	// Finally generate signal name.
	QString				sName		= QString("2%1").arg(signal.signature());
	connect(_widget, sName.toLatin1(), this, SLOT(onValueEdition()));
}

WgtVariableEditor::WgtVariableEditor (QWidget *parent, Variable const &var)
: QWidget(parent, 0), _widget(0), _variable(var) {
	// Create and set layout for this widget.
	QHBoxLayout	*lyt	= new QHBoxLayout(this);
	lyt->setSpacing(0);
	lyt->setMargin(0);
	setLayout(lyt);

	// Retrieve editor widget object.
	QItemEditorFactory const	*f	= QItemEditorFactory::defaultFactory();
	
	// Create the widget and store it's metaobject.
	_widget							= f->createEditor((QVariant::Type)_variable.value.userType(), this);
	lyt->addWidget(_widget);
	
	// Retrieve metaobject.
	QMetaObject const	*mo			= _widget->metaObject();
	// Retrieve value property name.
	QByteArray			vpName		= f->valuePropertyName((QVariant::Type)_variable.value.userType());
	// Set widget value.
	_widget->setProperty(vpName, _variable.value);
	// Get property index.
	int					pIndex		= mo->indexOfProperty(vpName);
	// Retrieve metamethod for notification signal.
	QMetaMethod			signal		= mo->property(pIndex).notifySignal();
	// Finally generate signal name.
	QString				sName		= QString("2%1").arg(signal.signature());
	connect(_widget, sName.toLatin1(), this, SLOT(onValueEdition()));
}

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Now, my problem is when it comes to editing lists and my QList-based custom types (REA::UIntList, REA::StringList, etc). i have no idea how to proceed. i first have created a template class (WgtListEditor), but Qt doesn't allow to subclass QObject (Nor QWidget, logic) in a template class...

i have tried then many and many other solutions... None of them works, and i got lost in the Qt editor logic.

Can someone please provide me with serious advices, and if possible with a diagram or some pseudo-code based on how my objects are made?

Thank you very much for your time, i appreciate any kind of help you could provide.
Pierre.

[EDIT]i notived my code was complettely messed up with the tabulations and everything... i recomend you switch to "plain" view of code, and copy paste into your favorite editor for a better anc clear view [/EDIT]

[hickscorp]

Bump... Anyone?