Add a context class for layouts

Stores information relating to the current context (such as
associated feature and layer) and rendering settings for a layout.

python/core/core_auto.sip

@@ -378,6 +378,7 @@
 %Include gps/qgsgpsdetector.sip
 %Include gps/qgsnmeaconnection.sip
 %Include gps/qgsgpsdconnection.sip
+%Include layout/qgslayoutcontext.sip
 %Include layout/qgslayoutitem.sip
 %Include layout/qgslayoutitemregistry.sip
 %Include layout/qgslayoutobject.sip

python/core/layout/qgslayoutcontext.sip

@@ -0,0 +1,111 @@
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/layout/qgslayoutcontext.h                                   *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
+ ************************************************************************/
+
+
+
+class QgsLayoutContext
+{
+%Docstring
+ Stores information relating to the current context and rendering settings for a layout.
+.. versionadded:: 3.0
+%End
+
+%TypeHeaderCode
+#include "qgslayoutcontext.h"
+%End
+  public:
+
+    enum Flag
+    {
+      FlagDebug,
+      FlagOutlineOnly,
+      FlagAntialiasing,
+      FlagUseAdvancedEffects,
+    };
+    typedef QFlags<QgsLayoutContext::Flag> Flags;
+
+
+    QgsLayoutContext();
+
+    void setFlags( const QgsLayoutContext::Flags flags );
+%Docstring
+ Sets the combination of ``flags`` that will be used for rendering the layout.
+.. seealso:: setFlag()
+.. seealso:: flags()
+.. seealso:: testFlag()
+%End
+
+    void setFlag( const QgsLayoutContext::Flag flag, const bool on = true );
+%Docstring
+ Enables or disables a particular rendering ``flag`` for the layout. Other existing
+ flags are not affected.
+.. seealso:: setFlags()
+.. seealso:: flags()
+.. seealso:: testFlag()
+%End
+
+    QgsLayoutContext::Flags flags() const;
+%Docstring
+ Returns the current combination of flags used for rendering the layout.
+.. seealso:: setFlags()
+.. seealso:: setFlag()
+.. seealso:: testFlag()
+ :rtype: QgsLayoutContext.Flags
+%End
+
+    bool testFlag( const Flag flag ) const;
+%Docstring
+ Check whether a particular rendering ``flag`` is enabled for the layout.
+.. seealso:: setFlags()
+.. seealso:: setFlag()
+.. seealso:: flags()
+ :rtype: bool
+%End
+
+    void setFeature( const QgsFeature &feature );
+%Docstring
+ Sets the current ``feature`` for evaluating the layout. This feature may
+ be used for altering an item's content and appearance for a report
+ or atlas layout.
+.. seealso:: feature()
+%End
+
+    QgsFeature feature() const;
+%Docstring
+ Returns the current feature for evaluating the layout. This feature may
+ be used for altering an item's content and appearance for a report
+ or atlas layout.
+.. seealso:: setFeature()
+ :rtype: QgsFeature
+%End
+
+    QgsVectorLayer *layer() const;
+%Docstring
+ Returns the vector layer associated with the layout's context.
+.. seealso:: setLayer()
+ :rtype: QgsVectorLayer
+%End
+
+    void setLayer( QgsVectorLayer *layer );
+%Docstring
+ Sets the vector ``layer`` associated with the layout's context.
+.. seealso:: layer()
+%End
+
+};
+
+
+
+
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/layout/qgslayoutcontext.h                                   *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
+ ************************************************************************/

src/core/CMakeLists.txt

@@ -350,6 +350,7 @@ SET(QGIS_CORE_SRCS
   dxf/qgsdxfpallabeling.cpp
 
   layout/qgslayout.cpp
+  layout/qgslayoutcontext.cpp
   layout/qgslayoutitem.cpp
   layout/qgslayoutitemregistry.cpp
   layout/qgslayoutmeasurement.cpp
@@ -671,6 +672,7 @@ SET(QGIS_CORE_MOC_HDRS
   gps/qgsgpsdconnection.h
 
   layout/qgslayout.h
+  layout/qgslayoutcontext.h
   layout/qgslayoutitem.h
   layout/qgslayoutitemregistry.h
   layout/qgslayoutobject.h

src/core/layout/qgslayoutcontext.cpp

@@ -0,0 +1,56 @@
+/***************************************************************************
+                             qgslayoutcontext.cpp
+                             --------------------
+    begin                : July 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.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "qgslayoutcontext.h"
+#include "qgsfeature.h"
+
+
+QgsLayoutContext::QgsLayoutContext()
+  : mFlags( FlagAntialiasing | FlagUseAdvancedEffects )
+{}
+
+void QgsLayoutContext::setFlags( const QgsLayoutContext::Flags flags )
+{
+  mFlags = flags;
+}
+
+void QgsLayoutContext::setFlag( const QgsLayoutContext::Flag flag, const bool on )
+{
+  if ( on )
+    mFlags |= flag;
+  else
+    mFlags &= ~flag;
+}
+
+QgsLayoutContext::Flags QgsLayoutContext::flags() const
+{
+  return mFlags;
+}
+
+bool QgsLayoutContext::testFlag( const QgsLayoutContext::Flag flag ) const
+{
+  return mFlags.testFlag( flag );
+}
+
+QgsVectorLayer *QgsLayoutContext::layer() const
+{
+  return mLayer;
+}
+
+void QgsLayoutContext::setLayer( QgsVectorLayer *layer )
+{
+  mLayer = layer;
+}

src/core/layout/qgslayoutcontext.h

@@ -0,0 +1,123 @@
+/***************************************************************************
+                             qgslayoutcontext.h
+                             -------------------
+    begin                : July 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 QGSLAYOUTCONTEXT_H
+#define QGSLAYOUTCONTEXT_H
+
+#include "qgis_core.h"
+#include "qgsfeature.h"
+#include "qgsvectorlayer.h"
+#include <QtGlobal>
+
+class QgsFeature;
+class QgsVectorLayer;
+
+/**
+ * \ingroup Layout
+ * \class QgsLayoutContext
+ * \brief Stores information relating to the current context and rendering settings for a layout.
+ * \since QGIS 3.0
+ */
+class CORE_EXPORT QgsLayoutContext
+{
+
+  public:
+
+    //! Flags for controlling how a layout is rendered
+    enum Flag
+    {
+      FlagDebug = 1 << 1,  //!< Debug/testing mode, items are drawn as solid rectangles.
+      FlagOutlineOnly = 1 << 2, //!< Render items as outlines only.
+      FlagAntialiasing = 1 << 3, //!< Use antialiasing when drawing items.
+      FlagUseAdvancedEffects = 1 << 4, //!< Enable advanced effects such as blend modes.
+    };
+    Q_DECLARE_FLAGS( Flags, Flag )
+
+    QgsLayoutContext();
+
+    /**
+     * Sets the combination of \a flags that will be used for rendering the layout.
+     * \see setFlag()
+     * \see flags()
+     * \see testFlag()
+     */
+    void setFlags( const QgsLayoutContext::Flags flags );
+
+    /**
+     * Enables or disables a particular rendering \a flag for the layout. Other existing
+     * flags are not affected.
+     * \see setFlags()
+     * \see flags()
+     * \see testFlag()
+     */
+    void setFlag( const QgsLayoutContext::Flag flag, const bool on = true );
+
+    /**
+     * Returns the current combination of flags used for rendering the layout.
+     * \see setFlags()
+     * \see setFlag()
+     * \see testFlag()
+     */
+    QgsLayoutContext::Flags flags() const;
+
+    /**
+     * Check whether a particular rendering \a flag is enabled for the layout.
+     * \see setFlags()
+     * \see setFlag()
+     * \see flags()
+     */
+    bool testFlag( const Flag flag ) const;
+
+    /**
+     * Sets the current \a feature for evaluating the layout. This feature may
+     * be used for altering an item's content and appearance for a report
+     * or atlas layout.
+     * \see feature()
+     */
+    void setFeature( const QgsFeature &feature ) { mFeature = feature; }
+
+    /**
+     * Returns the current feature for evaluating the layout. This feature may
+     * be used for altering an item's content and appearance for a report
+     * or atlas layout.
+     * \see setFeature()
+     */
+    QgsFeature feature() const { return mFeature; }
+
+    /**
+     * Returns the vector layer associated with the layout's context.
+     * \see setLayer()
+     */
+    QgsVectorLayer *layer() const;
+
+    /**
+     * Sets the vector \a layer associated with the layout's context.
+     * \see layer()
+     */
+    void setLayer( QgsVectorLayer *layer );
+
+  private:
+
+    Flags mFlags = 0;
+
+    QgsFeature mFeature;
+    QPointer< QgsVectorLayer > mLayer;
+
+};
+
+#endif //QGSLAYOUTCONTEXT_H
+
+
+

tests/src/core/CMakeLists.txt

@@ -127,6 +127,7 @@ SET(TESTS
  testqgslabelingengine.cpp
  testqgslayertree.cpp
  testqgslayout.cpp
+ testqgslayoutcontext.cpp
  testqgslayoutitem.cpp
  testqgslayoutobject.cpp
  testqgslayoutunits.cpp