qgsqmlwidgetwrapper.h

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/***************************************************************************
  qgsqmlwidgetwrapper.h
 
 ---------------------
 begin                : 25.6.2018
 copyright            : (C) 2018 by Matthias Kuhn
 email                : matthias@opengis.ch
 ***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef QGSQMLWIDGETWRAPPER_H
#define QGSQMLWIDGETWRAPPER_H
 
#include "qgis_gui.h"
#include "qgis_sip.h"
#include "qgsattributeform.h"
#include "qgswidgetwrapper.h"
 
#include <QQuickWidget>
 
class QgsQmlAttributeFormBridge;

class GUI_EXPORT QgsQmlWidgetWrapper : public QgsWidgetWrapper
{
    Q_OBJECT
 
  public:
    QgsQmlWidgetWrapper( QgsVectorLayer *layer, QWidget *editor, QWidget *parent );
 
    bool valid() const override;
 
    QWidget *createWidget( QWidget *parent ) override;
 
    void initWidget( QWidget *editor ) override;

    void reinitWidget();

    void setQmlCode( const QString &qmlCode );
 
  public slots:
    void setFeature( const QgsFeature &feature ) override;
 
  private slots:
    void setQmlContext();
 
  private:
    QTemporaryFile mQmlFile;
    QString mQmlCode;
    QQuickWidget *mWidget = nullptr;
    QgsQmlAttributeFormBridge *mWidgetBridge = nullptr;
    QgsFeature mFeature;
    QgsFeature mFormFeature;
    bool mRequiresFormScope = false;
};
 
 
#ifndef SIP_RUN

class QgsQmlExpression : public QObject
{
    Q_OBJECT
 
  public:
    void setExpressionContext( const QgsExpressionContext &context );

    Q_INVOKABLE QVariant evaluate( const QString &expression ) const;
 
  private:
    QgsExpressionContext mExpressionContext;
};
 

class QgsQmlAttributeFormBridge : public QObject
{
    Q_OBJECT

    Q_PROPERTY( QgsVectorLayer *layer READ layer )
 
    
    Q_PROPERTY( bool editable READ editable NOTIFY editableChanged )
 
    
    Q_PROPERTY( QgsAttributeEditorContext context READ context NOTIFY contextChanged )
 
    
    Q_PROPERTY( QgsFeature currentFormFeature READ currentFormFeature NOTIFY currentFormFeatureChanged )
 
  public:
    QgsQmlAttributeFormBridge( QgsAttributeForm *form, QObject *parent = nullptr );
    ~QgsQmlAttributeFormBridge() override = default;

    bool editable() const;

    QgsVectorLayer *layer() const;

    QgsAttributeEditorContext context() const;

    void setContext( const QgsAttributeEditorContext &context );

    QgsFeature currentFormFeature() const;

    Q_INVOKABLE void changeGeometry( const QgsGeometry &geometry );

    Q_INVOKABLE void changeAttribute( const QString &field, const QVariant &value );

    Q_INVOKABLE QVariant attribute( const QString &field );
 
  signals:
    void editableChanged();

    void contextChanged();

    void currentFormFeatureChanged();
 
  private:
    QgsAttributeForm *mForm = nullptr;
    QgsAttributeEditorContext mContext;
};

#endif //SIP_RUN
 
#endif // QGSQMLWIDGETWRAPPER_H