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qgslayertreemodellegendnode.h
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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 "qgsrasterdataprovider.h" // for QgsImageFetcher dtor visibility
class QgsLayerTreeLayer;
class QgsLayerTreeModel;
class QgsLegendSettings;
class QgsMapSettings;
class QgsSymbol;
class QgsRenderContext;
/**
* \ingroup core
* The QgsLegendRendererItem class is abstract interface for legend items
* returned from QgsMapLayerLegend implementation.
*
* The objects are used in QgsLayerTreeModel. Custom implementations may offer additional interactivity
* and customized look.
*
* \since QGIS 2.6
*/
class CORE_EXPORT QgsLayerTreeModelLegendNode : public QObject
{
Q_OBJECT
public:
enum LegendNodeRoles
{
RuleKeyRole = Qt::UserRole, //!< Rule key of the node (QString)
ParentRuleKeyRole //!< Rule key of the parent legend node - for legends with tree hierarchy (QString). Added in 2.8
};
//! Returns pointer to the parent layer node
QgsLayerTreeLayer *layerNode() const { return mLayerNode; }
//! Returns pointer to model owning this legend node
QgsLayerTreeModel *model() const;
//! Returns item flags associated with the item. Default implementation returns Qt::ItemIsEnabled.
virtual Qt::ItemFlags flags() const;
//! Returns data associated with the item. Must be implemented in derived class.
virtual QVariant data( int role ) const = 0;
//! Sets some data associated with the item. Default implementation does nothing and returns FALSE.
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 bool isScaleOK( double scale ) const { Q_UNUSED( scale ); return true; }
/**
* Notification from model that information from associated map view has changed.
* Default implementation does nothing. */
virtual void invalidateMapBasedData() {}
struct ItemContext
{
//! Render context, if available
QgsRenderContext *context = nullptr;
//! Painter
QPainter *painter = nullptr;
//! Top-left corner of the legend item
QPointF point;
//! offset from the left side where label should start
double labelXOffset;
};
struct ItemMetrics
{
QSizeF symbolSize;
QSizeF labelSize;
};
/**
* Entry point called from QgsLegendRenderer to do the rendering.
* Default implementation calls drawSymbol() and drawSymbolText() methods.
*
* If ctx is NULLPTR, this is just first stage when preparing layout - without actual rendering.
*/
virtual ItemMetrics draw( const QgsLegendSettings &settings, ItemContext *ctx );
void draw( const QgsLegendSettings &settings, QJsonObject &json );
/**
* Draws symbol on the left side of the item
* \param settings Legend layout configuration
* \param ctx Context for rendering - may be NULLPTR if only doing layout without actual rendering
* \param itemHeight Minimal height of the legend item - used for correct positioning when rendering
* \returns Real size of the symbol (may be bigger than "normal" symbol size from settings)
*/
virtual QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const;
/**
* Draws label on the right side of the item
* \param settings Legend layout configuration
* \param ctx Context for rendering - may be NULLPTR if only doing layout without actual rendering
* \param symbolSize Real size of the associated symbol - used for correct positioning when rendering
* \returns Size of the label (may span multiple lines)
*/
virtual QSizeF drawSymbolText( const QgsLegendSettings &settings, ItemContext *ctx, QSizeF symbolSize ) const;
void drawSymbolText( const QgsLegendSettings &settings, QJsonObject &json ) const;
signals:
//! Emitted on internal data change so the layer tree model can forward the signal to views
void dataChanged();
protected:
//! Construct the node with pointer to its parent layer node
explicit QgsLayerTreeModelLegendNode( QgsLayerTreeLayer *nodeL, QObject *parent SIP_TRANSFERTHIS = nullptr );
//! Returns a temporary context or null if legendMapViewData are not valid
QgsRenderContext *createTemporaryRenderContext() const SIP_FACTORY;
protected:
QgsLayerTreeLayer *mLayerNode = nullptr;
bool mEmbeddedInParent;
QString mUserLabel;
};
#include "qgslegendsymbolitem.h"
#include "qgstextrenderer.h"
/**
* \ingroup core
* Implementation of legend node interface for displaying preview of vector symbols and their labels
* and allowing interaction with the symbol / renderer.
*
* \since QGIS 2.6
*/
class CORE_EXPORT QgsSymbolLegendNode : public QgsLayerTreeModelLegendNode
{
Q_OBJECT
public:
/**
* Constructor for QgsSymbolLegendNode.
* \param nodeLayer layer node
* \param item the legend symbol item
* \param parent attach a parent QObject to the legend node.
*/
QgsSymbolLegendNode( QgsLayerTreeLayer *nodeLayer, const QgsLegendSymbolItem &item, QObject *parent SIP_TRANSFERTHIS = nullptr );
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;
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;
/**
* Set the icon size
* \since QGIS 2.10
*/
void setIconSize( QSize sz ) { mIconSize = sz; }
//! \since QGIS 2.10
QSize iconSize() const { return mIconSize; }
/**
* Calculates the minimum icon size to prevent cropping. When evaluating
* the size for multiple icons it is more efficient to create a single
* render context in advance and use the variant which accepts a QgsRenderContext
* argument.
* \since QGIS 2.10
*/
QSize minimumIconSize() const;
/**
* Calculates the minimum icon size to prevent cropping. When evaluating
* the size for multiple icons it is more efficient to create a single
* render context in advance and call this method instead of minimumIconSize().
* \since QGIS 2.18
*/
QSize minimumIconSize( QgsRenderContext *context ) const;
/**
* Returns the symbol used by the legend node.
* \see setSymbol()
* \since QGIS 2.14
*/
const QgsSymbol *symbol() const;
/**
* Sets the \a symbol to be used by the legend node. The symbol change is also propagated
* to the associated vector layer's renderer.
* \param symbol new symbol for node. Ownership is transferred.
* \see symbol()
* \since QGIS 2.14
*/
void setSymbol( QgsSymbol *symbol SIP_TRANSFER );
/**
* Returns label of text to be shown on top of the symbol.
* \since QGIS 3.2
*/
QString textOnSymbolLabel() const { return mTextOnSymbolLabel; }
/**
* Sets label of text to be shown on top of the symbol.
* \since QGIS 3.2
*/
void setTextOnSymbolLabel( const QString &label ) { mTextOnSymbolLabel = label; }
/**
* Returns text format of the label to be shown on top of the symbol.
* \since QGIS 3.2
*/
QgsTextFormat textOnSymbolTextFormat() const { return mTextOnSymbolTextFormat; }
/**
* Sets format of text to be shown on top of the symbol.
* \since QGIS 3.2
*/
void setTextOnSymbolTextFormat( const QgsTextFormat &format ) { mTextOnSymbolTextFormat = format; }
public slots:
/**
* Checks all items belonging to the same layer as this node.
* \see uncheckAllItems()
* \see toggleAllItems()
* \since QGIS 2.14
*/
void checkAllItems();
/**
* Unchecks all items belonging to the same layer as this node.
* \see checkAllItems()
* \see toggleAllItems()
* \since QGIS 2.14
*/
void uncheckAllItems();
/**
* Toggle all items belonging to the same layer as this node.
* \see checkAllItems()
* \see uncheckAllItems()
* \since QGIS 3.6
*/
void toggleAllItems();
private:
void updateLabel();
private:
QgsLegendSymbolItem mItem;
mutable QPixmap mPixmap; // cached symbol preview
QString mLabel;
bool mSymbolUsesMapUnits;
QSize mIconSize;
QString mTextOnSymbolLabel;
QgsTextFormat mTextOnSymbolTextFormat;
// ident the symbol icon to make it look like a tree structure
static const int INDENT_SIZE = 20;
/**
* Sets all items belonging to the same layer as this node to the same check state.
* \param state check state
*/
void checkAll( bool state );
};
/**
* \ingroup core
* Implementation of legend node interface for displaying arbitrary label with icon.
*
* \since QGIS 2.6
*/
class CORE_EXPORT QgsSimpleLegendNode : public QgsLayerTreeModelLegendNode
{
Q_OBJECT
public:
/**
* Constructor for QgsSimpleLegendNode.
* \param nodeLayer layer node
* \param label label
* \param icon icon
* \param parent attach a parent QObject to the legend node.
* \param key the rule key
*/
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;
};
/**
* \ingroup core
* Implementation of legend node interface for displaying arbitrary raster image
*
* \since QGIS 2.6
*/
class CORE_EXPORT QgsImageLegendNode : public QgsLayerTreeModelLegendNode
{
Q_OBJECT
public:
/**
* Constructor for QgsImageLegendNode.
* \param nodeLayer layer node
* \param img the image
* \param parent attach a parent QObject to the legend node.
*/
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;
private:
QImage mImage;
};
/**
* \ingroup core
* Implementation of legend node interface for displaying raster legend entries
*
* \since QGIS 2.6
*/
class CORE_EXPORT QgsRasterSymbolLegendNode : public QgsLayerTreeModelLegendNode
{
Q_OBJECT
public:
/**
* Constructor for QgsRasterSymbolLegendNode.
* \param nodeLayer layer node
* \param color color
* \param label label
* \param parent attach a parent QObject to the legend node.
*/
QgsRasterSymbolLegendNode( QgsLayerTreeLayer *nodeLayer, const QColor &color, const QString &label, QObject *parent SIP_TRANSFERTHIS = nullptr );
QVariant data( int role ) const override;
QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const override;
private:
QColor mColor;
QString mLabel;
};
class QgsImageFetcher;
/**
* \ingroup core
* Implementation of legend node interface for displaying WMS legend entries
*
* \since QGIS 2.8
*/
class CORE_EXPORT QgsWmsLegendNode : public QgsLayerTreeModelLegendNode
{
Q_OBJECT
public:
/**
* Constructor for QgsWmsLegendNode.
* \param nodeLayer layer node
* \param parent attach a parent QObject to the legend node.
*/
QgsWmsLegendNode( QgsLayerTreeLayer *nodeLayer, QObject *parent SIP_TRANSFERTHIS = nullptr );
QVariant data( int role ) const override;
QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) 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;
};
/**
* \ingroup core
* Produces legend node with a marker symbol
* \since QGIS 3.0
*/
class CORE_EXPORT QgsDataDefinedSizeLegendNode : public QgsLayerTreeModelLegendNode
{
Q_OBJECT
public:
//! Construct the node using QgsDataDefinedSizeLegend as definition of the node's appearance
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;
};
#endif // QGSLAYERTREEMODELLEGENDNODE_H