qgslayoutitemregistry.h

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/***************************************************************************
                            qgslayoutitemregistry.h
                            ------------------------
    begin                : June 2017
    copyright            : (C) 2017 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 QGSLAYOUTITEMREGISTRY_H
#define QGSLAYOUTITEMREGISTRY_H

#include "qgis_core.h"
#include "qgis_sip.h"
#include "qgsapplication.h"
#include "qgspathresolver.h"
#include <QGraphicsItem> //for QGraphicsItem::UserType
#include <QIcon>
#include <functional>

#include "qgslayoutitem.h" // temporary

class QgsLayout;
class QgsLayoutView;
class QgsLayoutItem;
class QgsFillSymbol;
class QgsLayoutMultiFrame;

class CORE_EXPORT QgsLayoutItemAbstractMetadata
{
  public:

    QgsLayoutItemAbstractMetadata( int type, const QString &visibleName )
      : mType( type )
      , mVisibleName( visibleName )
    {}

    virtual ~QgsLayoutItemAbstractMetadata() = default;

    int type() const { return mType; }

    QString visibleName() const { return mVisibleName; }

    virtual QgsLayoutItem *createItem( QgsLayout *layout ) = 0 SIP_FACTORY;

    virtual void resolvePaths( QVariantMap &properties, const QgsPathResolver &pathResolver, bool saving )
    {
      Q_UNUSED( properties )
      Q_UNUSED( pathResolver )
      Q_UNUSED( saving )
    }

  private:

    int mType = -1;
    QString mVisibleName;
};

typedef std::function<QgsLayoutItem *( QgsLayout * )> QgsLayoutItemCreateFunc SIP_SKIP;

typedef std::function<void( QVariantMap &, const QgsPathResolver &, bool )> QgsLayoutItemPathResolverFunc SIP_SKIP;

#ifndef SIP_RUN

class CORE_EXPORT QgsLayoutItemMetadata : public QgsLayoutItemAbstractMetadata
{
  public:

    QgsLayoutItemMetadata( int type, const QString &visibleName,
                           const QgsLayoutItemCreateFunc &pfCreate,
                           const QgsLayoutItemPathResolverFunc &pfPathResolver = nullptr )
      : QgsLayoutItemAbstractMetadata( type, visibleName )
      , mCreateFunc( pfCreate )
      , mPathResolverFunc( pfPathResolver )
    {}

    QgsLayoutItemCreateFunc createFunction() const { return mCreateFunc; }

    QgsLayoutItemPathResolverFunc pathResolverFunction() const { return mPathResolverFunc; }

    QgsLayoutItem *createItem( QgsLayout *layout ) override { return mCreateFunc ? mCreateFunc( layout ) : nullptr; }

    void resolvePaths( QVariantMap &properties, const QgsPathResolver &pathResolver, bool saving ) override
    {
      if ( mPathResolverFunc )
        mPathResolverFunc( properties, pathResolver, saving );
    }

  protected:
    QgsLayoutItemCreateFunc mCreateFunc = nullptr;
    QgsLayoutItemPathResolverFunc mPathResolverFunc = nullptr;

};

#endif

class CORE_EXPORT QgsLayoutMultiFrameAbstractMetadata
{
  public:

    QgsLayoutMultiFrameAbstractMetadata( int type, const QString &visibleName )
      : mType( type )
      , mVisibleName( visibleName )
    {}

    virtual ~QgsLayoutMultiFrameAbstractMetadata() = default;

    int type() const { return mType; }

    virtual QIcon icon() const { return QgsApplication::getThemeIcon( QStringLiteral( "/mActionAddBasicRectangle.svg" ) ); }

    QString visibleName() const { return mVisibleName; }

    virtual QgsLayoutMultiFrame *createMultiFrame( QgsLayout *layout ) = 0 SIP_FACTORY;

    virtual void resolvePaths( QVariantMap &properties, const QgsPathResolver &pathResolver, bool saving )
    {
      Q_UNUSED( properties )
      Q_UNUSED( pathResolver )
      Q_UNUSED( saving )
    }

  private:

    int mType = -1;
    QString mVisibleName;
};

typedef std::function<QgsLayoutMultiFrame *( QgsLayout * )> QgsLayoutMultiFrameCreateFunc SIP_SKIP;

typedef std::function<void( QVariantMap &, const QgsPathResolver &, bool )> QgsLayoutMultiFramePathResolverFunc SIP_SKIP;

#ifndef SIP_RUN

class CORE_EXPORT QgsLayoutMultiFrameMetadata : public QgsLayoutMultiFrameAbstractMetadata
{
  public:

    QgsLayoutMultiFrameMetadata( int type, const QString &visibleName,
                                 const QgsLayoutMultiFrameCreateFunc &pfCreate,
                                 const QgsLayoutMultiFramePathResolverFunc &pfPathResolver = nullptr )
      : QgsLayoutMultiFrameAbstractMetadata( type, visibleName )
      , mCreateFunc( pfCreate )
      , mPathResolverFunc( pfPathResolver )
    {}

    QgsLayoutMultiFrameCreateFunc createFunction() const { return mCreateFunc; }

    QgsLayoutMultiFramePathResolverFunc pathResolverFunction() const { return mPathResolverFunc; }

    QgsLayoutMultiFrame *createMultiFrame( QgsLayout *layout ) override { return mCreateFunc ? mCreateFunc( layout ) : nullptr; }

    void resolvePaths( QVariantMap &properties, const QgsPathResolver &pathResolver, bool saving ) override
    {
      if ( mPathResolverFunc )
        mPathResolverFunc( properties, pathResolver, saving );
    }

  protected:
    QgsLayoutMultiFrameCreateFunc mCreateFunc = nullptr;
    QgsLayoutMultiFramePathResolverFunc mPathResolverFunc = nullptr;

};

#endif


class CORE_EXPORT QgsLayoutItemRegistry : public QObject
{
    Q_OBJECT

  public:

    enum ItemType
    {
      LayoutItem = QGraphicsItem::UserType + 100, 
      LayoutGroup, 

      // known item types

      // WARNING!!!! SIP CASTING OF QgsLayoutItem and QgsLayoutMultiFrame DEPENDS on these
      // values, and must be updated if any additional types are added

      LayoutPage, 
      LayoutMap, 
      LayoutPicture, 
      LayoutLabel, 
      LayoutLegend, 
      LayoutShape, 
      LayoutPolygon, 
      LayoutPolyline, 
      LayoutScaleBar, 
      LayoutFrame, 

      // known multi-frame types

      // WARNING!!!! SIP CASTING OF QgsLayoutItem and QgsLayoutMultiFrame DEPENDS on these
      // values, and must be updated if any additional types are added

      LayoutHtml, 
      LayoutAttributeTable, 
      LayoutTextTable, 

      Layout3DMap,  

      // item types provided by plugins
      PluginItem = LayoutTextTable + 10000, 
    };

    QgsLayoutItemRegistry( QObject *parent = nullptr );

    ~QgsLayoutItemRegistry() override;

    bool populate();

    QgsLayoutItemRegistry( const QgsLayoutItemRegistry &rh ) = delete;
    QgsLayoutItemRegistry &operator=( const QgsLayoutItemRegistry &rh ) = delete;

    QgsLayoutItemAbstractMetadata *itemMetadata( int type ) const;

    QgsLayoutMultiFrameAbstractMetadata *multiFrameMetadata( int type ) const;

    bool addLayoutItemType( QgsLayoutItemAbstractMetadata *metadata SIP_TRANSFER );

    bool addLayoutMultiFrameType( QgsLayoutMultiFrameAbstractMetadata *metadata SIP_TRANSFER );

    QgsLayoutItem *createItem( int type, QgsLayout *layout ) const SIP_FACTORY;

    QgsLayoutMultiFrame *createMultiFrame( int type, QgsLayout *layout ) const SIP_FACTORY;

    void resolvePaths( int type, QVariantMap &properties, const QgsPathResolver &pathResolver, bool saving ) const;

    QMap< int, QString> itemTypes() const;

  signals:

    void typeAdded( int type, const QString &name );

    void multiFrameTypeAdded( int type, const QString &name );

  private:
#ifdef SIP_RUN
    QgsLayoutItemRegistry( const QgsLayoutItemRegistry &rh );
#endif

    QMap<int, QgsLayoutItemAbstractMetadata *> mMetadata;
    QMap<int, QgsLayoutMultiFrameAbstractMetadata *> mMultiFrameMetadata;

};

#if 0
#ifndef SIP_RUN
//simple item for testing
#ifdef ANDROID
// For some reason, the Android NDK toolchain requires this to link properly.
// Note to self: Please try to remove this again once Qt ships their libs built with gcc-5
class CORE_EXPORT TestLayoutItem : public QgsLayoutItem
#else
class TestLayoutItem : public QgsLayoutItem
#endif
{
    Q_OBJECT

  public:

    TestLayoutItem( QgsLayout *layout );
    ~TestLayoutItem() = default;

    //implement pure virtual methods
    int type() const override { return QgsLayoutItemRegistry::LayoutItem + 1002; }
    void draw( QgsRenderContext &context, const QStyleOptionGraphicsItem *itemStyle = nullptr ) override;

  private:
    QColor mColor;
    QgsFillSymbol *mShapeStyleSymbol = nullptr;
};
#endif
#endif

#endif //QGSLAYOUTITEMREGISTRY_H