qgsdataitem.h

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/***************************************************************************
                 qgsdataitem.h  - Items representing data
                             -------------------
    begin                : 2011-04-01
    copyright            : (C) 2011 Radim Blazek
    email                : radim dot blazek 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 QGSDATAITEM_H
#define QGSDATAITEM_H

#include "qgis.h"
#include "qgis_core.h"
#include <QFileSystemWatcher>
#include <QFutureWatcher>
#include <QIcon>
#include <QLibrary>
#include <QObject>
#include <QPixmap>
#include <QString>
#include <QTreeWidget>
#include <QVector>
#include <QDateTime>

#include "qgsmaplayer.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsmimedatautils.h"


class QgsDataProvider;
class QgsDataItem;
class QgsAnimatedIcon;

typedef QgsDataItem *dataItem_t( QString, QgsDataItem * ) SIP_SKIP;

class CORE_EXPORT QgsDataItem : public QObject
{

#ifdef SIP_RUN
    SIP_CONVERT_TO_SUBCLASS_CODE
    if ( qobject_cast<QgsLayerItem *>( sipCpp ) )
      sipType = sipType_QgsLayerItem;
    else if ( qobject_cast<QgsErrorItem *>( sipCpp ) )
      sipType = sipType_QgsErrorItem;
    else if ( qobject_cast<QgsDirectoryItem *>( sipCpp ) )
      sipType = sipType_QgsDirectoryItem;
    else if ( qobject_cast<QgsFavoritesItem *>( sipCpp ) )
      sipType = sipType_QgsFavoritesItem;
    else if ( qobject_cast<QgsZipItem *>( sipCpp ) )
      sipType = sipType_QgsZipItem;
    else if ( qobject_cast<QgsDataCollectionItem *>( sipCpp ) )
      sipType = sipType_QgsDataCollectionItem;
    else if ( qobject_cast<QgsProjectItem *>( sipCpp ) )
      sipType = sipType_QgsProjectItem;
    else
      sipType = 0;
    SIP_END
#endif

    Q_OBJECT

  public:
    enum Type
    {
      Collection,
      Directory,
      Layer,
      Error,
      Favorites, 
      Project, 
      Custom, 
    };

    Q_ENUM( Type );

    QgsDataItem( QgsDataItem::Type type, QgsDataItem *parent SIP_TRANSFERTHIS, const QString &name, const QString &path );
    ~QgsDataItem() override;

    bool hasChildren();

    int rowCount();

    virtual QVector<QgsDataItem *> createChildren() SIP_FACTORY;

    enum State
    {
      NotPopulated, 
      Populating,   
      Populated     
    };
    Q_ENUM( State );

    State state() const;

    virtual void setState( State state );

    virtual void addChildItem( QgsDataItem *child SIP_TRANSFER, bool refresh = false );

    virtual void deleteChildItem( QgsDataItem *child );

    virtual QgsDataItem *removeChildItem( QgsDataItem *child ) SIP_TRANSFERBACK;

    virtual bool equal( const QgsDataItem *other );

    virtual QWidget *paramWidget() SIP_FACTORY { return nullptr; }

    virtual QList<QAction *> actions( QWidget *parent );

    virtual QList<QMenu *> menus( QWidget *parent );

    virtual bool acceptDrop() { return false; }

    virtual bool handleDrop( const QMimeData * /*data*/, Qt::DropAction /*action*/ ) { return false; }

    virtual bool handleDoubleClick();

    virtual bool hasDragEnabled() const { return false; }

    virtual QgsMimeDataUtils::Uri mimeUri() const { return QgsMimeDataUtils::Uri(); }

    enum Capability
    {
      NoCapabilities    = 0,
      SetCrs            = 1 << 0, 
      Fertile           = 1 << 1, 
      Fast              = 1 << 2, 
      Collapse          = 1 << 3  
    };
    Q_DECLARE_FLAGS( Capabilities, Capability )

    
    virtual bool setCrs( const QgsCoordinateReferenceSystem &crs ) { Q_UNUSED( crs ); return false; }

    // ### QGIS 3 - rename to capabilities()
    virtual Capabilities capabilities2() const { return mCapabilities; }

    virtual void setCapabilities( Capabilities capabilities ) { mCapabilities = capabilities; }

    // static methods

    // Find child index in vector of items using '==' operator
    static int findItem( QVector<QgsDataItem *> items, QgsDataItem *item );

    // members

    Type type() const { return mType; }

    QgsDataItem *parent() const { return mParent; }

    void setParent( QgsDataItem *parent );
    QVector<QgsDataItem *> children() const { return mChildren; }
    virtual QIcon icon();

    QString name() const { return mName; }

    void setName( const QString &name );

    QString path() const { return mPath; }
    void setPath( const QString &path ) { mPath = path; }
    static QString pathComponent( const QString &component );

    virtual QVariant sortKey() const;

    void setSortKey( const QVariant &key );


    // Because QIcon (QPixmap) must not be used in outside the GUI thread, it is
    // not possible to set mIcon in constructor. Either use mIconName/setIconName()
    // or implement icon().
    void setIcon( const QIcon &icon ) { mIcon = icon; }
    void setIconName( const QString &iconName ) { mIconName = iconName; }

    void setToolTip( const QString &msg ) { mToolTip = msg; }
    QString toolTip() const { return mToolTip; }

    // deleteLater() items anc clear the vector
    static void deleteLater( QVector<QgsDataItem *> &items );

    void moveToThread( QThread *targetThread );

  protected:
    virtual void populate( const QVector<QgsDataItem *> &children );

    virtual void refresh( const QVector<QgsDataItem *> &children );

    bool deferredDelete() { return mDeferredDelete; }

    Type mType;
    Capabilities mCapabilities;
    QgsDataItem *mParent = nullptr;
    QVector<QgsDataItem *> mChildren; // easier to have it always
    State mState;
    QString mName;
    // Path is slash ('/') separated chain of item identifiers which are usually item names, but may be differen if it is
    // necessary to distinguish paths of two providers to the same source (e.g GRASS location and standard directory have the same
    // name but different paths). Identifiers in path must not contain '/' characters.
    // The path is used to identify item in tree.
    QString mPath;
    QString mToolTip;
    QString mIconName;
    QIcon mIcon;
    QMap<QString, QIcon> mIconMap;

    QVariant mSortKey;

  public slots:

    virtual void deleteLater();

    // Populate children using children vector created by createChildren()
    // \param foreground run createChildren in foreground
    virtual void populate( bool foreground = false );

    virtual void depopulate();

    virtual void refresh();

    virtual void refreshConnections();

    virtual void childrenCreated();

  signals:
    void beginInsertItems( QgsDataItem *parent, int first, int last );
    void endInsertItems();
    void beginRemoveItems( QgsDataItem *parent, int first, int last );
    void endRemoveItems();
    void dataChanged( QgsDataItem *item );
    void stateChanged( QgsDataItem *item, QgsDataItem::State oldState );

    void connectionsChanged();

  protected slots:

    void updateIcon();

  private:
    static QVector<QgsDataItem *> runCreateChildren( QgsDataItem *item );

    // Set to true if object has to be deleted when possible (nothing running in threads)
    bool mDeferredDelete;
    QFutureWatcher< QVector <QgsDataItem *> > *mFutureWatcher;
    // number of items currently in loading (populating) state
    static QgsAnimatedIcon *sPopulatingIcon;
};

Q_DECLARE_OPERATORS_FOR_FLAGS( QgsDataItem::Capabilities )


class CORE_EXPORT QgsLayerItem : public QgsDataItem
{
    Q_OBJECT

  public:
    enum LayerType
    {
      NoType,
      Vector,
      Raster,
      Point,
      Line,
      Polygon,
      TableLayer,
      Database,
      Table,
      Plugin     
    };

    Q_ENUM( LayerType );

    QgsLayerItem( QgsDataItem *parent, const QString &name, const QString &path, const QString &uri, LayerType layerType, const QString &providerKey );

    // --- reimplemented from QgsDataItem ---

    bool equal( const QgsDataItem *other ) override;

    bool hasDragEnabled() const override { return true; }

    QgsMimeDataUtils::Uri mimeUri() const override;

    // --- New virtual methods for layer item derived classes ---

    QgsMapLayer::LayerType mapLayerType() const;

    QString uri() const { return mUri; }

    QString providerKey() const { return mProviderKey; }

    QStringList supportedCrs() const { return mSupportedCRS; }

    QStringList supportedFormats() const { return mSupportFormats; }

    virtual QString comments() const { return QString(); }

    static QString layerTypeAsString( LayerType layerType );

    static QString iconName( LayerType layerType );

  protected:

    QString mProviderKey;
    QString mUri;
    LayerType mLayerType;
    QStringList mSupportedCRS;
    QStringList mSupportFormats;

  public:
    static QIcon iconPoint();
    static QIcon iconLine();
    static QIcon iconPolygon();
    static QIcon iconTable();
    static QIcon iconRaster();
    static QIcon iconDefault();

    virtual QString layerName() const { return name(); }
};


class CORE_EXPORT QgsDataCollectionItem : public QgsDataItem
{
    Q_OBJECT
  public:
    QgsDataCollectionItem( QgsDataItem *parent, const QString &name, const QString &path = QString() );
    ~QgsDataCollectionItem() override;

    void addChild( QgsDataItem *item SIP_TRANSFER ) { mChildren.append( item ); }

    static QIcon iconDir(); // shared icon: open/closed directory
    static QIcon iconDataCollection(); // default icon for data collection
};

class CORE_EXPORT QgsDirectoryItem : public QgsDataCollectionItem
{
    Q_OBJECT
  public:
    enum Column
    {
      Name,
      Size,
      Date,
      Permissions,
      Owner,
      Group,
      Type
    };

    QgsDirectoryItem( QgsDataItem *parent, const QString &name, const QString &path );

    QgsDirectoryItem( QgsDataItem *parent, const QString &name, const QString &dirPath, const QString &path );

    void setState( State state ) override;

    QVector<QgsDataItem *> createChildren() override;

    QString dirPath() const { return mDirPath; }
    bool equal( const QgsDataItem *other ) override;
    QIcon icon() override;
    QWidget *paramWidget() override SIP_FACTORY;

    static bool hiddenPath( const QString &path );

    QList<QAction *> actions( QWidget *parent ) override;


  public slots:
    void childrenCreated() override;
    void directoryChanged();

  protected:
    void init();
    QString mDirPath;

  private:
    QFileSystemWatcher *mFileSystemWatcher = nullptr;
    bool mRefreshLater;
    QDateTime mLastScan;
};

class CORE_EXPORT QgsProjectItem : public QgsDataItem
{
    Q_OBJECT
  public:

    QgsProjectItem( QgsDataItem *parent, const QString &name, const QString &path );

    bool hasDragEnabled() const override { return true; }

};

class CORE_EXPORT QgsErrorItem : public QgsDataItem
{
    Q_OBJECT
  public:

    QgsErrorItem( QgsDataItem *parent, const QString &error, const QString &path );

};


// ---------

class CORE_EXPORT QgsDirectoryParamWidget : public QTreeWidget
{
    Q_OBJECT

  public:
    QgsDirectoryParamWidget( const QString &path, QWidget *parent SIP_TRANSFERTHIS = nullptr );

  protected:
    void mousePressEvent( QMouseEvent *event ) override;

  public slots:
    void showHideColumn();
};

class CORE_EXPORT QgsFavoritesItem : public QgsDataCollectionItem
{
    Q_OBJECT
  public:

    QgsFavoritesItem( QgsDataItem *parent, const QString &name, const QString &path = QString() );

    QVector<QgsDataItem *> createChildren() override;

    void addDirectory( const QString &directory, const QString &name = QString() );

    void removeDirectory( QgsDirectoryItem *item );

    void renameFavorite( const QString &path, const QString &name );

    static QIcon iconFavorites();

    QVariant sortKey() const override;

  private:
    QVector<QgsDataItem *> createChildren( const QString &favDir, const QString &name );
};

class CORE_EXPORT QgsZipItem : public QgsDataCollectionItem
{
    Q_OBJECT

  protected:
    QString mFilePath;
    QString mVsiPrefix;
    QStringList mZipFileList;

  public:
    QgsZipItem( QgsDataItem *parent, const QString &name, const QString &path );
    QgsZipItem( QgsDataItem *parent, const QString &name, const QString &filePath, const QString &path );

    QVector<QgsDataItem *> createChildren() override;
    QStringList getZipFileList();

    static QVector<dataItem_t *> sDataItemPtr SIP_SKIP;
    static QStringList sProviderNames;

    static QString vsiPrefix( const QString &uri ) { return qgsVsiPrefix( uri ); }

    static QgsDataItem *itemFromPath( QgsDataItem *parent, const QString &path, const QString &name ) SIP_FACTORY;

    static QgsDataItem *itemFromPath( QgsDataItem *parent, const QString &filePath, const QString &name, const QString &path ) SIP_FACTORY SIP_PYNAME( itemFromFilePath );

    static QIcon iconZip();

  private:
    void init();
};


#ifndef SIP_RUN

class CORE_EXPORT QgsProjectHomeItem : public QgsDirectoryItem
{
    Q_OBJECT

  public:

    QgsProjectHomeItem( QgsDataItem *parent, const QString &name, const QString &dirPath, const QString &path );

    QIcon icon() override;
    QVariant sortKey() const override;

};

class CORE_EXPORT QgsFavoriteItem : public QgsDirectoryItem
{
    Q_OBJECT

  public:

    QgsFavoriteItem( QgsFavoritesItem *parent, const QString &name, const QString &dirPath, const QString &path );

    void rename( const QString &name );

  private:

    QgsFavoritesItem *mFavorites = nullptr;
};

#endif

#endif // QGSDATAITEM_H