path: root/src/declarative/util/qdeclarativelistmodel_p_p.h

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#ifndef QDECLARATIVELISTMODEL_P_P_H
#define QDECLARATIVELISTMODEL_P_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "private/qdeclarativelistmodel_p.h"
#include "private/qdeclarativeengine_p.h"
#include "private/qdeclarativeopenmetaobject_p.h"
#include "qdeclarative.h"

#include <private/qscriptdeclarativeclass_p.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)

class QDeclarativeOpenMetaObject;
class QScriptEngine;
class QDeclarativeListModelWorkerAgent;
struct ModelNode;
class FlatListScriptClass;
class FlatNodeData;

class FlatListModel
{
public:
    FlatListModel(QDeclarativeListModel *base);
    ~FlatListModel();

    QHash<int,QVariant> data(int index, const QList<int> &roles) const;
    QVariant data(int index, int role) const;

    QList<int> roles() const;
    QString toString(int role) const;

    int count() const;
    void clear();
    void remove(int index);
    bool append(const QScriptValue&);
    bool insert(int index, const QScriptValue&);
    QScriptValue get(int index) const;
    void set(int index, const QScriptValue&, QList<int> *roles);
    void setProperty(int index, const QString& property, const QVariant& value, QList<int> *roles);
    void move(int from, int to, int count);

private:    
    friend class QDeclarativeListModelWorkerAgent;
    friend class QDeclarativeListModel;
    friend class FlatListScriptClass;
    friend class FlatNodeData;

    bool addValue(const QScriptValue &value, QHash<int, QVariant> *row, QList<int> *roles);
    void insertedNode(int index);
    void removedNode(int index);
    void moveNodes(int from, int to, int n);

    QScriptEngine *m_scriptEngine;
    QHash<int, QString> m_roles;
    QHash<QString, int> m_strings;
    QList<QHash<int, QVariant> > m_values;
    QDeclarativeListModel *m_listModel;

    FlatListScriptClass *m_scriptClass;
    QList<FlatNodeData *> m_nodeData;
    QDeclarativeListModelWorkerAgent *m_parentAgent;
};


/*
    Created when get() is called on a FlatListModel. This allows changes to the
    object returned by get() to be tracked, and passed onto the model.
*/
class FlatListScriptClass : public QScriptDeclarativeClass
{
public:
    FlatListScriptClass(FlatListModel *model, QScriptEngine *seng);

    Value property(Object *, const Identifier &);
    void setProperty(Object *, const Identifier &name, const QScriptValue &);
    QScriptClass::QueryFlags queryProperty(Object *, const Identifier &, QScriptClass::QueryFlags flags);
    bool compare(Object *, Object *);

private:
    FlatListModel *m_model;
};

/*
    FlatNodeData and FlatNodeObjectData allow objects returned by get() to still
    point to the correct list index if move(), insert() or remove() are called.
*/
struct FlatNodeObjectData;
class FlatNodeData
{
public:
    FlatNodeData(int i)
        : index(i) {}

    ~FlatNodeData();

    void addData(FlatNodeObjectData *data);
    void removeData(FlatNodeObjectData *data);

    int index;

private:
    QSet<FlatNodeObjectData*> objects;
};

struct FlatNodeObjectData : public QScriptDeclarativeClass::Object
{
    FlatNodeObjectData(FlatNodeData *data) : nodeData(data) {
        nodeData->addData(this);
    }

    ~FlatNodeObjectData() {
        if (nodeData)
            nodeData->removeData(this);
    }

    FlatNodeData *nodeData;
};



class NestedListModel
{
public:
    NestedListModel(QDeclarativeListModel *base);
    ~NestedListModel();

    QHash<int,QVariant> data(int index, const QList<int> &roles, bool *hasNested = 0) const;
    QVariant data(int index, int role) const;

    QList<int> roles() const;
    QString toString(int role) const;

    int count() const;
    void clear();
    void remove(int index);
    bool append(const QScriptValue&);
    bool insert(int index, const QScriptValue&);
    QScriptValue get(int index) const;
    void set(int index, const QScriptValue&, QList<int> *roles);
    void setProperty(int index, const QString& property, const QVariant& value, QList<int> *role);
    void move(int from, int to, int count);

    QVariant valueForNode(ModelNode *, bool *hasNested = 0) const;
    void checkRoles() const;

    ModelNode *_root;
    bool m_ownsRoot;
    QDeclarativeListModel *m_listModel;

private:
    friend struct ModelNode;
    mutable QStringList roleStrings;
    mutable bool _rolesOk;
};


class ModelNodeMetaObject;
class ModelObject : public QObject
{
    Q_OBJECT
public:
    ModelObject(ModelNode *node, NestedListModel *model, QScriptEngine *seng);
    void setValue(const QByteArray &name, const QVariant &val);
    void setNodeUpdatesEnabled(bool enable);

    NestedListModel *m_model;
    ModelNode *m_node;

private:
    ModelNodeMetaObject *m_meta;
};

class ModelNodeMetaObject : public QDeclarativeOpenMetaObject
{
public:
    ModelNodeMetaObject(QScriptEngine *seng, ModelObject *object);

    bool m_enabled;

protected:
    void propertyWritten(int index);

private:
    QScriptEngine *m_seng;
    ModelObject *m_obj;
};


/*
    A ModelNode is created for each item in a NestedListModel.
*/
struct ModelNode
{
    ModelNode(NestedListModel *model);
    ~ModelNode();

    QList<QVariant> values;
    QHash<QString, ModelNode *> properties;

    void clear();

    QDeclarativeListModel *model(const NestedListModel *model) {
        if (!modelCache) { 
            modelCache = new QDeclarativeListModel;
            QDeclarativeEngine::setContextForObject(modelCache,QDeclarativeEngine::contextForObject(model->m_listModel));
            modelCache->m_nested->_root = this;  // ListModel defaults to nestable model

            for (int i=0; i<values.count(); ++i) {
                ModelNode *subNode = qvariant_cast<ModelNode *>(values.at(i));
                if (subNode)
                    subNode->m_model = modelCache->m_nested;
            }
        }
        return modelCache;
    }

    ModelObject *object(const NestedListModel *model) {
        if (!objectCache) {
            objectCache = new ModelObject(this, 
                    const_cast<NestedListModel*>(model), 
                    QDeclarativeEnginePrivate::getScriptEngine(qmlEngine(model->m_listModel)));
            QHash<QString, ModelNode *>::iterator it;
            for (it = properties.begin(); it != properties.end(); ++it) {
                objectCache->setValue(it.key().toUtf8(), model->valueForNode(*it));
            }
            objectCache->setNodeUpdatesEnabled(true);
        }
        return objectCache;
    }


    void setObjectValue(const QScriptValue& valuemap, bool writeToCache = true);
    void setListValue(const QScriptValue& valuelist);
    void setProperty(const QString& prop, const QVariant& val);
    void changedProperty(const QString &name) const;
    void updateListIndexes();
    static void dump(ModelNode *node, int ind);

    QDeclarativeListModel *modelCache;
    ModelObject *objectCache;
    bool isArray;

    NestedListModel *m_model;
    int listIndex;  // only used for top-level nodes within a list
};


QT_END_NAMESPACE

Q_DECLARE_METATYPE(ModelNode *)

QT_END_HEADER

#endif // QDECLARATIVELISTMODEL_P_P_H