qgsprocessingwidgetwrapper.h

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/***************************************************************************
                         qgsprocessingwidgetwrapper.h
                         ---------------------
    begin                : August 2018
    copyright            : (C) 2018 by Nyall Dawson
    email                : nyall dot dawson at gmail dot 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.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSPROCESSINGWIDGETWRAPPER_H
#define QGSPROCESSINGWIDGETWRAPPER_H
 
#include <QObject>
#include <QWidget>
#include <QPointer>
#include <memory>
#include "qgis_gui.h"
#include "qgis_sip.h"
#include "qgsprocessinggui.h"
#include "qgsvectorlayer.h"
 
class QgsProcessingParameterDefinition;
class QgsProcessingContext;
class QgsProcessingModelerParameterWidget;
class QgsProcessingModelAlgorithm;
class QLabel;
class QgsPropertyOverrideButton;
class QgsVectorLayer;
class QgsProcessingModelAlgorithm;
class QgsMapCanvas;
class QgsProcessingAlgorithm;
class QgsProcessingAbstractParameterDefinitionWidget;
class QgsMessageBar;
class QgsBrowserGuiModel;
 
class GUI_EXPORT QgsProcessingContextGenerator
{
  public:
 
    virtual QgsProcessingContext *processingContext() = 0;
 
    virtual ~QgsProcessingContextGenerator() = default;
};
 
class GUI_EXPORT QgsProcessingParametersGenerator
{
  public:
 
    enum class Flag : int
    {
      SkipDefaultValueParameters = 1 << 0, 
    };
    Q_DECLARE_FLAGS( Flags, Flag )
 
    
    virtual QVariantMap createProcessingParameters( QgsProcessingParametersGenerator::Flags flags = QgsProcessingParametersGenerator::Flags() ) = 0;
 
    virtual ~QgsProcessingParametersGenerator() = default;
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS( QgsProcessingParametersGenerator::Flags )
 
 
class GUI_EXPORT QgsProcessingParameterWidgetContext
{
  public:
 
    QgsProcessingParameterWidgetContext() = default;
 
    void setMapCanvas( QgsMapCanvas *canvas );
 
    QgsMapCanvas *mapCanvas() const;
 
    void setMessageBar( QgsMessageBar *bar );
 
    QgsMessageBar *messageBar() const;
 
    void setBrowserModel( QgsBrowserGuiModel *model );
 
    QgsBrowserGuiModel *browserModel() const;
 
    void setProject( QgsProject *project );
 
    QgsProject *project() const;
 
    QgsProcessingModelAlgorithm *model() const;
 
    void setModel( QgsProcessingModelAlgorithm *model );
 
    QString modelChildAlgorithmId() const;
 
    void setModelChildAlgorithmId( const QString &id );
 
    QgsMapLayer *activeLayer() const;
 
    void setActiveLayer( QgsMapLayer *layer );
 
  private:
 
    QgsProcessingModelAlgorithm *mModel = nullptr;
 
    QString mModelChildAlgorithmId;
 
    QgsMapCanvas *mMapCanvas = nullptr;
 
    QgsMessageBar *mMessageBar = nullptr;
 
    QgsProject *mProject = nullptr;
 
    QgsBrowserGuiModel *mBrowserModel = nullptr;
 
    QgsMapLayer *mActiveLayer = nullptr;
 
};
 
#ifndef SIP_RUN
class GUI_EXPORT QgsProcessingGuiUtils
{
  public:
 
    static QgsExpressionContext createExpressionContext( QgsProcessingContextGenerator *processingContextGenerator = nullptr,
        const QgsProcessingParameterWidgetContext &widgetContext = QgsProcessingParameterWidgetContext(),
        const QgsProcessingAlgorithm *algorithm = nullptr,
        const QgsVectorLayer *linkedLayer = nullptr );
 
 
};
#endif
 
class GUI_EXPORT QgsAbstractProcessingParameterWidgetWrapper : public QObject, public QgsExpressionContextGenerator
{
    Q_OBJECT
 
  public:
 
    QgsAbstractProcessingParameterWidgetWrapper( const QgsProcessingParameterDefinition *parameter = nullptr,
        QgsProcessingGui::WidgetType type = QgsProcessingGui::Standard, QObject *parent SIP_TRANSFERTHIS = nullptr );
 
    QgsProcessingGui::WidgetType type() const;
 
    virtual void setWidgetContext( const QgsProcessingParameterWidgetContext &context );
 
    const QgsProcessingParameterWidgetContext &widgetContext() const;
 
    QWidget *createWrappedWidget( QgsProcessingContext &context ) SIP_FACTORY;
 
    QLabel *createWrappedLabel() SIP_FACTORY;
 
    QWidget *wrappedWidget();
 
    QLabel *wrappedLabel();
 
    const QgsProcessingParameterDefinition *parameterDefinition() const;
 
    // TODO QGIS 4.0 -- remove
#ifdef SIP_RUN
    % Property( name = param, get = parameterDefinition )
#endif
 
    void setParameterValue( const QVariant &value, QgsProcessingContext &context );
 
    QVariant parameterValue() const;
 
    virtual QVariantMap customProperties() const;
 
    virtual void registerProcessingContextGenerator( QgsProcessingContextGenerator *generator );
 
    void registerProcessingParametersGenerator( QgsProcessingParametersGenerator *generator );
 
    virtual void postInitialize( const QList< QgsAbstractProcessingParameterWidgetWrapper * > &wrappers );
 
    virtual int stretch() const;
 
    QgsExpressionContext createExpressionContext() const override;
 
    virtual void setDialog( QDialog *dialog );
 
  signals:
 
    // TODO QGIS 4.0 - remove wrapper parameter - this is kept for compatibility with 3.x API,
    // yet can easily be retrieved by checking the sender()
 
    void widgetValueHasChanged( QgsAbstractProcessingParameterWidgetWrapper *wrapper );
 
  protected:
 
    virtual QWidget *createWidget() = 0 SIP_FACTORY;
 
    virtual QLabel *createLabel() SIP_FACTORY;
 
    virtual void setWidgetValue( const QVariant &value, QgsProcessingContext &context ) = 0;
 
    virtual QVariant widgetValue() const = 0;
 
    virtual const QgsVectorLayer *linkedVectorLayer() const;
 
  protected:
 
    QgsProcessingContextGenerator *mProcessingContextGenerator = nullptr;
    QgsProcessingParametersGenerator *mParametersGenerator = nullptr;
    QgsProcessingParameterWidgetContext mWidgetContext;
 
  private slots:
 
    void parentLayerChanged( QgsAbstractProcessingParameterWidgetWrapper *wrapper );
 
  private:
 
    QgsProcessingGui::WidgetType mType = QgsProcessingGui::Standard;
    const QgsProcessingParameterDefinition *mParameterDefinition = nullptr;
 
    void setDynamicParentLayerParameter( const QgsAbstractProcessingParameterWidgetWrapper *parentWrapper );
 
    QPointer< QWidget > mWidget;
    QPointer< QgsPropertyOverrideButton > mPropertyButton;
    QPointer< QLabel > mLabel;
    std::unique_ptr< QgsVectorLayer > mDynamicLayer;
 
    friend class TestProcessingGui;
 
};
 
 
class GUI_EXPORT QgsProcessingParameterWidgetFactoryInterface
{
 
  public:
 
    virtual ~QgsProcessingParameterWidgetFactoryInterface() = default;
 
    virtual QString parameterType() const = 0;
 
    virtual QgsAbstractProcessingParameterWidgetWrapper *createWidgetWrapper( const QgsProcessingParameterDefinition *parameter,
        QgsProcessingGui::WidgetType type ) = 0 SIP_FACTORY;
 
    virtual QgsProcessingModelerParameterWidget *createModelerWidgetWrapper( QgsProcessingModelAlgorithm *model,
        const QString &childId,
        const QgsProcessingParameterDefinition *parameter,
        QgsProcessingContext &context );
 
    virtual QgsProcessingAbstractParameterDefinitionWidget *createParameterDefinitionWidget(
      QgsProcessingContext &context,
      const QgsProcessingParameterWidgetContext &widgetContext,
      const QgsProcessingParameterDefinition *definition = nullptr,
      const QgsProcessingAlgorithm *algorithm = nullptr ) SIP_FACTORY;
 
  protected:
 
    virtual QStringList compatibleParameterTypes() const = 0;
 
    virtual QStringList compatibleOutputTypes() const = 0;
 
    virtual QList< int > compatibleDataTypes( const QgsProcessingParameterDefinition *parameter ) const;
 
    virtual QString modelerExpressionFormatString() const;
 
    virtual Qgis::ProcessingModelChildParameterSource defaultModelSource( const QgsProcessingParameterDefinition *parameter ) const;
 
};
 
class GUI_EXPORT QgsProcessingHiddenWidgetWrapper: public QgsAbstractProcessingParameterWidgetWrapper
{
    Q_OBJECT
  public:
 
    QgsProcessingHiddenWidgetWrapper( const QgsProcessingParameterDefinition *parameter = nullptr,
                                      QgsProcessingGui::WidgetType type = QgsProcessingGui::Standard,
                                      QObject *parent SIP_TRANSFERTHIS = nullptr );
 
    void setWidgetValue( const QVariant &value, QgsProcessingContext &context ) override;
    QVariant widgetValue() const override;
 
    const QgsVectorLayer *linkedVectorLayer() const override;
 
    void setLinkedVectorLayer( const QgsVectorLayer *layer );
 
  protected:
    QWidget *createWidget() override;
    QLabel *createLabel() override;
 
  private:
 
    QVariant mValue;
    QPointer < const QgsVectorLayer > mLayer;
 
};
 
#endif // QGSPROCESSINGWIDGETWRAPPER_H