qgslayertreemodellegendnode.h

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/***************************************************************************
  qgslayertreemodellegendnode.h
  --------------------------------------
  Date                 : August 2014
  Copyright            : (C) 2014 by Martin Dobias
  Email                : wonder dot sk at gmail dot com
 
  QgsWMSLegendNode     : Sandro Santilli < strk at keybit dot net >
 
 ***************************************************************************
 *                                                                         *
 *   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 QGSLAYERTREEMODELLEGENDNODE_H
#define QGSLAYERTREEMODELLEGENDNODE_H
 
#include <QIcon>
#include <QObject>
 
#include "qgis_core.h"
#include "qgis_sip.h"
 
#include "qgsexpressioncontext.h"
#include "qgslegendpatchshape.h"
#include "qgspallabeling.h"
 
class QgsLayerTreeLayer;
class QgsLayerTreeModel;
class QgsLegendSettings;
class QgsMapSettings;
class QgsSymbol;
class QgsRenderContext;
 
class CORE_EXPORT QgsLayerTreeModelLegendNode : public QObject
{
#ifdef SIP_RUN
#include "qgscolorramplegendnode.h"
#endif
 
#ifdef SIP_RUN
    SIP_CONVERT_TO_SUBCLASS_CODE
    if ( qobject_cast<QgsSymbolLegendNode *> ( sipCpp ) )
      sipType = sipType_QgsSymbolLegendNode;
    else if ( qobject_cast<QgsDataDefinedSizeLegendNode *> ( sipCpp ) )
      sipType = sipType_QgsDataDefinedSizeLegendNode;
    else if ( qobject_cast<QgsImageLegendNode *> ( sipCpp ) )
      sipType = sipType_QgsImageLegendNode;
    else if ( qobject_cast<QgsRasterSymbolLegendNode *> ( sipCpp ) )
      sipType = sipType_QgsRasterSymbolLegendNode;
    else if ( qobject_cast<QgsSimpleLegendNode *> ( sipCpp ) )
      sipType = sipType_QgsSimpleLegendNode;
    else if ( qobject_cast<QgsWmsLegendNode *> ( sipCpp ) )
      sipType = sipType_QgsWmsLegendNode;
    else if ( qobject_cast<QgsColorRampLegendNode *> ( sipCpp ) )
      sipType = sipType_QgsColorRampLegendNode;
    else
      sipType = 0;
    SIP_END
#endif
 
    Q_OBJECT
 
  public:
 
    enum LegendNodeRoles
    {
      RuleKeyRole = Qt::UserRole, 
      ParentRuleKeyRole, 
      NodeTypeRole, 
    };
 
    enum NodeTypes
    {
      SimpleLegend, 
      SymbolLegend, 
      RasterSymbolLegend, 
      ImageLegend, 
      WmsLegend, 
      DataDefinedSizeLegend, 
      EmbeddedWidget, 
      ColorRampLegend, 
    };
 
    QgsLayerTreeLayer *layerNode() const { return mLayerNode; }
 
    QgsLayerTreeModel *model() const;
 
    virtual Qt::ItemFlags flags() const;
 
    virtual QVariant data( int role ) const = 0;
 
    virtual bool setData( const QVariant &value, int role );
 
    virtual bool isEmbeddedInParent() const { return mEmbeddedInParent; }
    virtual void setEmbeddedInParent( bool embedded ) { mEmbeddedInParent = embedded; }
 
    virtual QString userLabel() const { return mUserLabel; }
    virtual void setUserLabel( const QString &userLabel ) { mUserLabel = userLabel; }
 
    virtual QSizeF userPatchSize() const;
 
    virtual void setUserPatchSize( QSizeF size );
 
    virtual void setColumnBreak( bool breakBeforeNode ) { mColumnBreakBeforeNode = breakBeforeNode; }
 
    virtual bool columnBreak() const { return mColumnBreakBeforeNode; }
 
    virtual bool isScaleOK( double scale ) const { Q_UNUSED( scale ) return true; }
 
    virtual void invalidateMapBasedData() {}
 
    struct ItemContext
    {
      Q_NOWARN_DEPRECATED_PUSH     //because of deprecated members
      ItemContext() = default;
      Q_NOWARN_DEPRECATED_POP
 
      QgsRenderContext *context = nullptr;
      QPainter *painter = nullptr;
 
      Q_DECL_DEPRECATED QPointF point;
 
      Q_DECL_DEPRECATED double labelXOffset = 0.0;
 
      double top = 0.0;
 
      double columnLeft = 0.0;
 
      double columnRight = 0.0;
 
      double maxSiblingSymbolWidth = 0.0;
 
      QgsLegendPatchShape patchShape;
 
      QSizeF patchSize;
    };
 
    struct ItemMetrics
    {
      QSizeF symbolSize;
      QSizeF labelSize;
    };
 
    virtual ItemMetrics draw( const QgsLegendSettings &settings, ItemContext *ctx );
 
    QJsonObject exportToJson( const QgsLegendSettings &settings, const QgsRenderContext &context );
 
    virtual QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const;
 
    virtual QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const;
 
    virtual QSizeF drawSymbolText( const QgsLegendSettings &settings, ItemContext *ctx, QSizeF symbolSize ) const;
 
  public slots:
 
    void checkAllItems();
 
    void uncheckAllItems();
 
    void toggleAllItems();
 
  signals:
    void dataChanged();
 
    void sizeChanged();
 
  protected:
    explicit QgsLayerTreeModelLegendNode( QgsLayerTreeLayer *nodeL, QObject *parent SIP_TRANSFERTHIS = nullptr );
 
    QgsRenderContext *createTemporaryRenderContext() const SIP_FACTORY;
 
  protected:
    QgsLayerTreeLayer *mLayerNode = nullptr;
    bool mEmbeddedInParent;
    QString mUserLabel;
    QgsLegendPatchShape mPatchShape;
    QSizeF mUserSize;
    bool mColumnBreakBeforeNode = false;
 
  private:
 
    void checkAll( bool state );
};
Q_DECLARE_METATYPE( QgsLayerTreeModelLegendNode::NodeTypes )
 
#include "qgslegendsymbolitem.h"
#include "qgstextformat.h"
 
class CORE_EXPORT QgsSymbolLegendNode : public QgsLayerTreeModelLegendNode
{
    Q_OBJECT
 
  public:
 
    static double MINIMUM_SIZE;
    static double MAXIMUM_SIZE;
 
    QgsSymbolLegendNode( QgsLayerTreeLayer *nodeLayer, const QgsLegendSymbolItem &item, QObject *parent SIP_TRANSFERTHIS = nullptr );
    ~QgsSymbolLegendNode();
 
    Qt::ItemFlags flags() const override;
    QVariant data( int role ) const override;
    bool setData( const QVariant &value, int role ) override;
 
    QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const override;
 
    QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const override;
 
    void setEmbeddedInParent( bool embedded ) override;
 
    void setUserLabel( const QString &userLabel ) override { mUserLabel = userLabel; updateLabel(); }
 
    bool isScaleOK( double scale ) const override { return mItem.isScaleOK( scale ); }
 
    void invalidateMapBasedData() override;
 
    void setIconSize( QSize sz ) { mIconSize = sz; }
    QSize iconSize() const { return mIconSize; }
 
    QSize minimumIconSize() const;
 
    QSize minimumIconSize( QgsRenderContext *context ) const;
 
    const QgsSymbol *symbol() const;
 
    void setSymbol( QgsSymbol *symbol SIP_TRANSFER );
 
    QString textOnSymbolLabel() const { return mTextOnSymbolLabel; }
 
    void setTextOnSymbolLabel( const QString &label ) { mTextOnSymbolLabel = label; }
 
    QgsTextFormat textOnSymbolTextFormat() const { return mTextOnSymbolTextFormat; }
 
    void setTextOnSymbolTextFormat( const QgsTextFormat &format ) { mTextOnSymbolTextFormat = format; }
 
    QString symbolLabel() const;
 
    QgsLegendPatchShape patchShape() const;
 
    void setPatchShape( const QgsLegendPatchShape &shape );
 
    QgsSymbol *customSymbol() const;
 
    void setCustomSymbol( QgsSymbol *symbol SIP_TRANSFER );
 
    QString evaluateLabel( const QgsExpressionContext &context = QgsExpressionContext(), const QString &label = QString() );
 
  private:
    void updateLabel();
 
  private:
    QgsLegendSymbolItem mItem;
    mutable QPixmap mPixmap; // cached symbol preview
    QString mLabel;
    bool mSymbolUsesMapUnits;
 
    QSize mIconSize;
 
    QString mTextOnSymbolLabel;
    QgsTextFormat mTextOnSymbolTextFormat;
 
    std::unique_ptr< QgsSymbol > mCustomSymbol;
 
    // ident the symbol icon to make it look like a tree structure
    static const int INDENT_SIZE = 20;
 
    QgsExpressionContextScope *createSymbolScope() const SIP_FACTORY;
 
};
 
 
class CORE_EXPORT QgsSimpleLegendNode : public QgsLayerTreeModelLegendNode
{
    Q_OBJECT
 
  public:
 
    QgsSimpleLegendNode( QgsLayerTreeLayer *nodeLayer, const QString &label, const QIcon &icon = QIcon(), QObject *parent SIP_TRANSFERTHIS = nullptr, const QString &key = QString() );
 
    QVariant data( int role ) const override;
 
  private:
    QString mLabel;
    QString mId;
    QIcon mIcon;
    QString mKey;
};
 
 
class CORE_EXPORT QgsImageLegendNode : public QgsLayerTreeModelLegendNode
{
    Q_OBJECT
 
  public:
 
    QgsImageLegendNode( QgsLayerTreeLayer *nodeLayer, const QImage &img, QObject *parent SIP_TRANSFERTHIS = nullptr );
 
    QVariant data( int role ) const override;
 
    QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const override;
 
    QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const override;
 
  private:
    QImage mImage;
};
 
class CORE_EXPORT QgsRasterSymbolLegendNode : public QgsLayerTreeModelLegendNode
{
    Q_OBJECT
 
  public:
 
    QgsRasterSymbolLegendNode( QgsLayerTreeLayer *nodeLayer, const QColor &color, const QString &label, QObject *parent SIP_TRANSFERTHIS = nullptr, bool isCheckable = false, const QString &ruleKey = QString() );
 
    Qt::ItemFlags flags() const override;
    QVariant data( int role ) const override;
    bool setData( const QVariant &value, int role ) override;
    QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const override;
    QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const override;
 
    QString ruleKey() const { return mRuleKey; }
 
    bool isCheckable() const { return mCheckable; }
 
  private:
    QColor mColor;
    QString mLabel;
    bool mCheckable = false;
    QString mRuleKey;
};
 
class QgsImageFetcher;
 
class CORE_EXPORT QgsWmsLegendNode : public QgsLayerTreeModelLegendNode
{
    Q_OBJECT
 
  public:
 
    QgsWmsLegendNode( QgsLayerTreeLayer *nodeLayer, QObject *parent SIP_TRANSFERTHIS = nullptr );
 
    ~QgsWmsLegendNode() override;
 
    QVariant data( int role ) const override;
 
    QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const override;
 
    QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const override;
 
    void invalidateMapBasedData() override;
 
  private slots:
 
    void getLegendGraphicFinished( const QImage & );
    void getLegendGraphicErrored( const QString & );
    void getLegendGraphicProgress( qint64, qint64 );
 
  private:
 
    // Lazily initializes mImage
    QImage getLegendGraphic() const;
 
    QImage renderMessage( const QString &msg ) const;
 
    QImage mImage;
 
    bool mValid;
 
    mutable std::unique_ptr<QgsImageFetcher> mFetcher;
};
 
 
class CORE_EXPORT QgsDataDefinedSizeLegendNode : public QgsLayerTreeModelLegendNode
{
    Q_OBJECT
 
  public:
    QgsDataDefinedSizeLegendNode( QgsLayerTreeLayer *nodeLayer, const QgsDataDefinedSizeLegend &settings, QObject *parent SIP_TRANSFERTHIS = nullptr );
    ~QgsDataDefinedSizeLegendNode() override;
 
    QVariant data( int role ) const override;
 
    ItemMetrics draw( const QgsLegendSettings &settings, ItemContext *ctx ) override;
 
  private:
    void cacheImage() const;
    QgsDataDefinedSizeLegend *mSettings = nullptr;
    mutable QImage mImage;
};
 
class CORE_EXPORT QgsVectorLabelLegendNode : public QgsLayerTreeModelLegendNode
{
    Q_OBJECT
  public:
 
    QgsVectorLabelLegendNode( QgsLayerTreeLayer *nodeLayer, const QgsPalLayerSettings &labelSettings, QObject *parent = nullptr );
    ~QgsVectorLabelLegendNode() override;
 
    QVariant data( int role ) const override;
 
    QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const override;
 
    QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const override;
 
  private:
    QgsPalLayerSettings mLabelSettings;
    QSizeF drawSymbol( const QgsLegendSettings &settings, const QgsRenderContext &renderContext, double xOffset = 0.0, double yOffset = 0.0 ) const;
    void textWidthHeight( double &width, double &height, QgsRenderContext &ctx, const QgsTextFormat &textFormat, const QStringList &textLines ) const;
};
 
 
#endif // QGSLAYERTREEMODELLEGENDNODE_H