QGIS API Documentation  3.23.0-Master (c716e02dd3)
qgsvaluerelationconfigdlg.cpp
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1 /***************************************************************************
2  qgsvaluerelationconfigdlg.cpp
3  --------------------------------------
4  Date : 5.1.2014
5  Copyright : (C) 2014 Matthias Kuhn
6  Email : matthias at opengis dot ch
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 
17 #include "qgsproject.h"
18 #include "qgsvectorlayer.h"
22 
24  : QgsEditorConfigWidget( vl, fieldIdx, parent )
25 {
26  setupUi( this );
27  mLayerName->setFilters( QgsMapLayerProxyModel::VectorLayer );
28  mKeyColumn->setLayer( mLayerName->currentLayer() );
29  mValueColumn->setLayer( mLayerName->currentLayer() );
30  mDescriptionExpression->setLayer( mLayerName->currentLayer() );
31  connect( mLayerName, &QgsMapLayerComboBox::layerChanged, mKeyColumn, &QgsFieldComboBox::setLayer );
32  connect( mLayerName, &QgsMapLayerComboBox::layerChanged, mValueColumn, &QgsFieldComboBox::setLayer );
33  connect( mLayerName, &QgsMapLayerComboBox::layerChanged, mDescriptionExpression, &QgsFieldExpressionWidget::setLayer );
34  connect( mLayerName, &QgsMapLayerComboBox::layerChanged, this, &QgsValueRelationConfigDlg::layerChanged );
35  connect( mEditExpression, &QAbstractButton::clicked, this, &QgsValueRelationConfigDlg::editExpression );
36 
37  mNofColumns->setMinimum( 1 );
38  mNofColumns->setMaximum( 10 );
39  mNofColumns->setValue( 1 );
40 
42  connect( mKeyColumn, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, &QgsEditorConfigWidget::changed );
43  connect( mValueColumn, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, &QgsEditorConfigWidget::changed );
44  connect( mDescriptionExpression, static_cast<void ( QgsFieldExpressionWidget::* )( const QString & )>( &QgsFieldExpressionWidget::fieldChanged ), this, &QgsEditorConfigWidget::changed );
45  connect( mAllowMulti, &QAbstractButton::toggled, this, &QgsEditorConfigWidget::changed );
46  connect( mAllowNull, &QAbstractButton::toggled, this, &QgsEditorConfigWidget::changed );
47  connect( mOrderByValue, &QAbstractButton::toggled, this, &QgsEditorConfigWidget::changed );
48  connect( mFilterExpression, &QTextEdit::textChanged, this, &QgsEditorConfigWidget::changed );
49  connect( mUseCompleter, &QAbstractButton::toggled, this, &QgsEditorConfigWidget::changed );
50  connect( mAllowMulti, &QAbstractButton::toggled, this, [ = ]( bool checked )
51  {
52  label_nofColumns->setEnabled( checked );
53  mNofColumns->setEnabled( checked );
54  }
55  );
56 
57  connect( mNofColumns, static_cast < void ( QSpinBox::* )( int ) > ( &QSpinBox::valueChanged ), this, &QgsEditorConfigWidget::changed );
58 
59  layerChanged();
60 }
61 
63 {
64  QVariantMap cfg;
65 
66  cfg.insert( QStringLiteral( "Layer" ), mLayerName->currentLayer() ? mLayerName->currentLayer()->id() : QString() );
67  cfg.insert( QStringLiteral( "LayerName" ), mLayerName->currentLayer() ? mLayerName->currentLayer()->name() : QString() );
68  cfg.insert( QStringLiteral( "LayerSource" ), mLayerName->currentLayer() ? mLayerName->currentLayer()->publicSource() : QString() );
69  cfg.insert( QStringLiteral( "LayerProviderName" ), ( mLayerName->currentLayer() && mLayerName->currentLayer()->dataProvider() ) ?
70  mLayerName->currentLayer()->providerType() :
71  QString() );
72  cfg.insert( QStringLiteral( "Key" ), mKeyColumn->currentField() );
73  cfg.insert( QStringLiteral( "Value" ), mValueColumn->currentField() );
74  cfg.insert( QStringLiteral( "Description" ), mDescriptionExpression->expression() );
75  cfg.insert( QStringLiteral( "AllowMulti" ), mAllowMulti->isChecked() );
76  cfg.insert( QStringLiteral( "NofColumns" ), mNofColumns->value() );
77  cfg.insert( QStringLiteral( "AllowNull" ), mAllowNull->isChecked() );
78  cfg.insert( QStringLiteral( "OrderByValue" ), mOrderByValue->isChecked() );
79  cfg.insert( QStringLiteral( "FilterExpression" ), mFilterExpression->toPlainText() );
80  cfg.insert( QStringLiteral( "UseCompleter" ), mUseCompleter->isChecked() );
81 
82  return cfg;
83 }
84 
85 void QgsValueRelationConfigDlg::setConfig( const QVariantMap &config )
86 {
88  mLayerName->setLayer( lyr );
89  mKeyColumn->setField( config.value( QStringLiteral( "Key" ) ).toString() );
90  mValueColumn->setField( config.value( QStringLiteral( "Value" ) ).toString() );
91  mDescriptionExpression->setField( config.value( QStringLiteral( "Description" ) ).toString() );
92  mAllowMulti->setChecked( config.value( QStringLiteral( "AllowMulti" ) ).toBool() );
93  mNofColumns->setValue( config.value( QStringLiteral( "NofColumns" ), 1 ).toInt() );
94  if ( !mAllowMulti->isChecked() )
95  {
96  label_nofColumns->setEnabled( false );
97  mNofColumns->setEnabled( false );
98  }
99  mAllowNull->setChecked( config.value( QStringLiteral( "AllowNull" ) ).toBool() );
100  mOrderByValue->setChecked( config.value( QStringLiteral( "OrderByValue" ) ).toBool() );
101  mFilterExpression->setPlainText( config.value( QStringLiteral( "FilterExpression" ) ).toString() );
102  mUseCompleter->setChecked( config.value( QStringLiteral( "UseCompleter" ) ).toBool() );
103 }
104 
105 void QgsValueRelationConfigDlg::layerChanged()
106 {
107  mFilterExpression->setEnabled( qobject_cast<QgsVectorLayer *>( mLayerName->currentLayer() ) );
108  mEditExpression->setEnabled( qobject_cast<QgsVectorLayer *>( mLayerName->currentLayer() ) );
109 }
110 
112 {
113  QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( mLayerName->currentLayer() );
114  if ( !vl )
115  return;
116 
120 
121  context.setHighlightedFunctions( QStringList() << QStringLiteral( "current_value" ) << QStringLiteral( "current_parent_value" ) );
122  context.setHighlightedVariables( QStringList() << QStringLiteral( "current_geometry" )
123  << QStringLiteral( "current_feature" )
124  << QStringLiteral( "form_mode" )
125  << QStringLiteral( "current_parent_geometry" )
126  << QStringLiteral( "current_parent_feature" ) );
127 
128  QgsExpressionBuilderDialog dlg( vl, mFilterExpression->toPlainText(), this, QStringLiteral( "generic" ), context );
129  dlg.setWindowTitle( tr( "Edit Filter Expression" ) );
130 
131  if ( dlg.exec() == QDialog::Accepted )
132  {
133  mFilterExpression->setText( dlg.expressionBuilder()->expressionText() );
134  }
135 }
This class should be subclassed for every configurable editor widget type.
void changed()
Emitted when the configuration of the widget is changed.
A generic dialog for building expression strings.
QgsExpressionBuilderWidget * expressionBuilder()
The builder widget that is used by the dialog.
QString expressionText()
Gets the expression string that has been set in the expression area.
static QgsExpressionContextScope * parentFormScope(const QgsFeature &formFeature=QgsFeature(), const QString &formMode=QString())
Creates a new scope which contains functions and variables from the current parent attribute form/tab...
static QgsExpressionContextScope * formScope(const QgsFeature &formFeature=QgsFeature(), const QString &formMode=QString())
Creates a new scope which contains functions and variables from the current attribute form/table form...
static QList< QgsExpressionContextScope * > globalProjectLayerScopes(const QgsMapLayer *layer)
Creates a list of three scopes: global, layer's project and layer.
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
void setHighlightedFunctions(const QStringList &names)
Sets the list of function names intended to be highlighted to the user.
void setHighlightedVariables(const QStringList &variableNames)
Sets the list of variable names within the context intended to be highlighted to the user.
void setLayer(QgsMapLayer *layer)
Sets the layer for which fields are listed in the combobox.
The QgsFieldExpressionWidget class reates a widget to choose fields and edit expressions It contains ...
void setLayer(QgsMapLayer *layer)
Sets the layer used to display the fields and expression.
void fieldChanged(const QString &fieldName)
Emitted when the currently selected field changes.
void layerChanged(QgsMapLayer *layer)
Emitted whenever the currently selected layer changes.
static QgsProject * instance()
Returns the QgsProject singleton instance.
Definition: qgsproject.cpp:470
QgsValueRelationConfigDlg(QgsVectorLayer *vl, int fieldIdx, QWidget *parent=nullptr)
void setConfig(const QVariantMap &config) override
Update the configuration widget to represent the given configuration.
QVariantMap config() override
Create a configuration from the current GUI state.
static QgsVectorLayer * resolveLayer(const QVariantMap &config, const QgsProject *project)
Returns the (possibly NULL) layer from the widget's config and project.
Represents a vector layer which manages a vector based data sets.