QGIS API Documentation  3.17.0-Master (8af46bc54f)
qgssymbolwidgetcontext.cpp
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1 /***************************************************************************
2  qgssymbolwidgetcontext.cpp
3  --------------------------
4  begin : September 2016
5  copyright : (C) 2016 by Nyall Dawson
6  email : nyall dot dawson at gmail dot com
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
15 #include "qgssymbolwidgetcontext.h"
16 #include "qgsmapcanvas.h"
17 #include "qgsmessagebar.h"
18 #include "qgsproject.h"
20 #include "qgstemporalcontroller.h"
21 
23  : mMapCanvas( other.mMapCanvas )
24  , mMessageBar( other.mMessageBar )
25  , mAdditionalScopes( other.mAdditionalScopes )
26 {
27  if ( other.mExpressionContext )
28  {
29  mExpressionContext.reset( new QgsExpressionContext( *other.mExpressionContext ) );
30  }
31 }
32 
34 {
35  mMapCanvas = other.mMapCanvas;
36  mMessageBar = other.mMessageBar;
37  mAdditionalScopes = other.mAdditionalScopes;
38  if ( other.mExpressionContext )
39  {
40  mExpressionContext.reset( new QgsExpressionContext( *other.mExpressionContext ) );
41  }
42  else
43  {
44  mExpressionContext.reset();
45  }
46  return *this;
47 }
48 
50 {
51  mMapCanvas = canvas;
52 }
53 
55 {
56  return mMapCanvas;
57 }
58 
60 {
61  mMessageBar = bar;
62 }
63 
65 {
66  return mMessageBar;
67 }
68 
70 {
71  if ( context )
72  mExpressionContext.reset( new QgsExpressionContext( *context ) );
73  else
74  mExpressionContext.reset();
75 }
76 
78 {
79  return mExpressionContext.get();
80 }
81 
82 void QgsSymbolWidgetContext::setAdditionalExpressionContextScopes( const QList<QgsExpressionContextScope> &scopes )
83 {
84  mAdditionalScopes = scopes;
85 }
86 
87 QList<QgsExpressionContextScope> QgsSymbolWidgetContext::additionalExpressionContextScopes() const
88 {
89  return mAdditionalScopes;
90 }
91 
92 QList<QgsExpressionContextScope *> QgsSymbolWidgetContext::globalProjectAtlasMapLayerScopes( const QgsMapLayer *layer ) const
93 {
94  QList<QgsExpressionContextScope *> scopes;
98  if ( mMapCanvas )
99  {
101  << mMapCanvas->defaultExpressionContextScope()
102  << new QgsExpressionContextScope( mMapCanvas->expressionContextScope() );
103 
104  if ( const QgsExpressionContextScopeGenerator *generator = dynamic_cast< const QgsExpressionContextScopeGenerator * >( mMapCanvas->temporalController() ) )
105  {
106  scopes << generator->createExpressionContextScope();
107  }
108  }
109  else
110  {
112  }
113  if ( layer )
114  scopes << QgsExpressionContextUtils::layerScope( layer );
115  return scopes;
116 }
QList< QgsExpressionContextScope * > globalProjectAtlasMapLayerScopes(const QgsMapLayer *layer) const
Returns list of scopes: global, project, atlas, map, layer.
Base class for all map layer types.
Definition: qgsmaplayer.h:83
QgsSymbolWidgetContext & operator=(const QgsSymbolWidgetContext &other)
const QgsTemporalController * temporalController() const
Gets access to the temporal controller that will be used to update the canvas temporal range...
A bar for displaying non-blocking messages to the user.
Definition: qgsmessagebar.h:60
static QgsExpressionContextScope * projectScope(const QgsProject *project)
Creates a new scope which contains variables and functions relating to a QGIS project.
static QgsExpressionContextScope * atlasScope(const QgsLayoutAtlas *atlas)
Creates a new scope which contains variables and functions relating to a QgsLayoutAtlas.
void setMapCanvas(QgsMapCanvas *canvas)
Sets the map canvas associated with the widget.
Map canvas is a class for displaying all GIS data types on a canvas.
Definition: qgsmapcanvas.h:84
QgsExpressionContextScope * defaultExpressionContextScope()
Creates a new scope which contains default variables and functions relating to the map canvas...
The QgsMapSettings class contains configuration for rendering of the map.
void setMessageBar(QgsMessageBar *bar)
Sets the message bar associated with the widget.
static QgsExpressionContextScope * globalScope()
Creates a new scope which contains variables and functions relating to the global QGIS context...
Contains settings which reflect the context in which a symbol (or renderer) widget is shown...
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
Single scope for storing variables and functions for use within a QgsExpressionContext.
void setAdditionalExpressionContextScopes(const QList< QgsExpressionContextScope > &scopes)
Sets a list of additional expression context scopes to show as available within the layer...
void setExpressionContext(QgsExpressionContext *context)
Sets the optional expression context used for the widget.
QgsSymbolWidgetContext()=default
Constructor for QgsSymbolWidgetContext.
const QgsMapSettings & mapSettings() const
Gets access to properties used for map rendering.
QgsMapCanvas * mapCanvas() const
Returns the map canvas associated with the widget.
QgsExpressionContext * expressionContext() const
Returns the expression context used for the widget, if set.
static QgsExpressionContextScope * mapSettingsScope(const QgsMapSettings &mapSettings)
Creates a new scope which contains variables and functions relating to a QgsMapSettings object...
QgsExpressionContextScope & expressionContextScope()
Returns a reference to the expression context scope for the map canvas.
Definition: qgsmapcanvas.h:644
Abstract interface for generating an expression context scope.
static QgsProject * instance()
Returns the QgsProject singleton instance.
Definition: qgsproject.cpp:469
QgsMessageBar * messageBar() const
Returns the message bar associated with the widget.
static QgsExpressionContextScope * layerScope(const QgsMapLayer *layer)
Creates a new scope which contains variables and functions relating to a QgsMapLayer.
QList< QgsExpressionContextScope > additionalExpressionContextScopes() const
Returns the list of additional expression context scopes to show as available within the layer...