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Search widget wrapper for relation reference widget
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python/gui/editorwidgets/qgsrelationreferencesearchwidgetwrapper.sip
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| /** \ingroup gui | ||
| * \class QgsRelationReferenceSearchWidgetWrapper | ||
| * Wraps a relation reference search widget. | ||
| * \note Added in version 2.16 | ||
| */ | ||
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| class QgsRelationReferenceSearchWidgetWrapper : QgsSearchWidgetWrapper | ||
| { | ||
| %TypeHeaderCode | ||
| #include <qgsrelationreferencesearchwidgetwrapper.h> | ||
| %End | ||
| public: | ||
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| explicit QgsRelationReferenceSearchWidgetWrapper( QgsVectorLayer* vl, int fieldIdx, QgsMapCanvas* canvas, QWidget* parent = nullptr ); | ||
| bool applyDirectly(); | ||
| QString expression(); | ||
| bool valid() const; | ||
| QVariant value() const; | ||
| FilterFlags supportedFlags() const; | ||
| FilterFlags defaultFlags() const; | ||
| virtual QString createExpression( FilterFlags flags ) const; | ||
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| public slots: | ||
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| virtual void clearWidget(); | ||
| virtual void setEnabled( bool enabled ); | ||
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| protected: | ||
| QWidget* createWidget( QWidget* parent ); | ||
| void initWidget( QWidget* editor ); | ||
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| public slots: | ||
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| //! Called when current value of search widget changes | ||
| void onValueChanged( QVariant value ); | ||
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| protected slots: | ||
| void setExpression( QString exp ); | ||
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| }; | ||
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src/gui/editorwidgets/qgsrelationreferencesearchwidgetwrapper.cpp
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| /*************************************************************************** | ||
| qgsrelationreferencesearchwidgetwrapper.cpp | ||
| ------------------------------------------ | ||
| Date : 2016-05-25 | ||
| Copyright : (C) 2016 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. * | ||
| * * | ||
| ***************************************************************************/ | ||
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| #include "qgsrelationreferencesearchwidgetwrapper.h" | ||
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| #include "qgsfield.h" | ||
| #include "qgsmaplayerregistry.h" | ||
| #include "qgsvaluerelationwidgetfactory.h" | ||
| #include "qgsvectorlayer.h" | ||
| #include "qgsproject.h" | ||
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| #include <QSettings> | ||
| #include <QStringListModel> | ||
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| QgsRelationReferenceSearchWidgetWrapper::QgsRelationReferenceSearchWidgetWrapper( QgsVectorLayer* vl, int fieldIdx, QgsMapCanvas* canvas, QWidget* parent ) | ||
| : QgsSearchWidgetWrapper( vl, fieldIdx, parent ) | ||
| , mWidget( nullptr ) | ||
| , mLayer( nullptr ) | ||
| , mCanvas( canvas ) | ||
| { | ||
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| } | ||
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| bool QgsRelationReferenceSearchWidgetWrapper::applyDirectly() | ||
| { | ||
| return true; | ||
| } | ||
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| QString QgsRelationReferenceSearchWidgetWrapper::expression() | ||
| { | ||
| return mExpression; | ||
| } | ||
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| QVariant QgsRelationReferenceSearchWidgetWrapper::value() const | ||
| { | ||
| if ( mWidget ) | ||
| { | ||
| return mWidget->foreignKey(); | ||
| } | ||
| return QVariant(); | ||
| } | ||
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| QgsSearchWidgetWrapper::FilterFlags QgsRelationReferenceSearchWidgetWrapper::supportedFlags() const | ||
| { | ||
| return EqualTo | NotEqualTo | IsNull | IsNotNull; | ||
| } | ||
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| QgsSearchWidgetWrapper::FilterFlags QgsRelationReferenceSearchWidgetWrapper::defaultFlags() const | ||
| { | ||
| return EqualTo; | ||
| } | ||
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| QString QgsRelationReferenceSearchWidgetWrapper::createExpression( QgsSearchWidgetWrapper::FilterFlags flags ) const | ||
| { | ||
| QString fieldName = QgsExpression::quotedColumnRef( layer()->fields().at( mFieldIdx ).name() ); | ||
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| //clear any unsupported flags | ||
| flags &= supportedFlags(); | ||
| if ( flags & IsNull ) | ||
| return fieldName + " IS NULL"; | ||
| if ( flags & IsNotNull ) | ||
| return fieldName + " IS NOT NULL"; | ||
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| QVariant v = value(); | ||
| if ( !v.isValid() ) | ||
| return QString(); | ||
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| switch ( v.type() ) | ||
| { | ||
| case QVariant::Int: | ||
| case QVariant::UInt: | ||
| case QVariant::Double: | ||
| case QVariant::LongLong: | ||
| case QVariant::ULongLong: | ||
| { | ||
| if ( flags & EqualTo ) | ||
| return fieldName + '=' + v.toString(); | ||
| else if ( flags & NotEqualTo ) | ||
| return fieldName + "<>" + v.toString(); | ||
| break; | ||
| } | ||
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| default: | ||
| { | ||
| if ( flags & EqualTo ) | ||
| return fieldName + "='" + v.toString() + '\''; | ||
| else if ( flags & NotEqualTo ) | ||
| return fieldName + "<>'" + v.toString() + '\''; | ||
| break; | ||
| } | ||
| } | ||
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| return QString(); | ||
| } | ||
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| void QgsRelationReferenceSearchWidgetWrapper::clearWidget() | ||
| { | ||
| if ( mWidget ) | ||
| { | ||
| mWidget->showIndeterminateState(); | ||
| } | ||
| } | ||
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| void QgsRelationReferenceSearchWidgetWrapper::setEnabled( bool enabled ) | ||
| { | ||
| if ( mWidget ) | ||
| { | ||
| mWidget->setEnabled( enabled ); | ||
| } | ||
| } | ||
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| bool QgsRelationReferenceSearchWidgetWrapper::valid() const | ||
| { | ||
| return true; | ||
| } | ||
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| void QgsRelationReferenceSearchWidgetWrapper::onValueChanged( QVariant value ) | ||
| { | ||
| if ( !value.isValid() ) | ||
| { | ||
| clearExpression(); | ||
| emit valueCleared(); | ||
| } | ||
| else | ||
| { | ||
| QSettings settings; | ||
| setExpression( value.isNull() ? settings.value( "qgis/nullValue", "NULL" ).toString() : value.toString() ); | ||
| emit valueChanged(); | ||
| } | ||
| emit expressionChanged( mExpression ); | ||
| } | ||
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| void QgsRelationReferenceSearchWidgetWrapper::setExpression( QString exp ) | ||
| { | ||
| QSettings settings; | ||
| QString nullValue = settings.value( "qgis/nullValue", "NULL" ).toString(); | ||
| QString fieldName = layer()->fields().at( mFieldIdx ).name(); | ||
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| QString str; | ||
| if ( exp == nullValue ) | ||
| { | ||
| str = QString( "%1 IS NULL" ).arg( QgsExpression::quotedColumnRef( fieldName ) ); | ||
| } | ||
| else | ||
| { | ||
| str = QString( "%1 = '%3'" ) | ||
| .arg( QgsExpression::quotedColumnRef( fieldName ), | ||
| exp.replace( '\'', "''" ) | ||
| ); | ||
| } | ||
| mExpression = str; | ||
| } | ||
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| QWidget* QgsRelationReferenceSearchWidgetWrapper::createWidget( QWidget* parent ) | ||
| { | ||
| return new QgsRelationReferenceWidget( parent ); | ||
| } | ||
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| void QgsRelationReferenceSearchWidgetWrapper::initWidget( QWidget* editor ) | ||
| { | ||
| mWidget = qobject_cast<QgsRelationReferenceWidget*>( editor ); | ||
| if ( !mWidget ) | ||
| return; | ||
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| mWidget->setEditorContext( context(), mCanvas, nullptr ); | ||
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| mWidget->setEmbedForm( false ); | ||
| mWidget->setReadOnlySelector( false ); | ||
| mWidget->setAllowMapIdentification( config( "MapIdentification", false ).toBool() ); | ||
| mWidget->setOrderByValue( config( "OrderByValue", false ).toBool() ); | ||
| mWidget->setAllowAddFeatures( false ); | ||
| mWidget->setOpenFormButtonVisible( false ); | ||
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| QgsRelation relation = QgsProject::instance()->relationManager()->relation( config( "Relation" ).toString() ); | ||
| mWidget->setRelation( relation, false ); | ||
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| mWidget->showIndeterminateState(); | ||
| connect( mWidget, SIGNAL( foreignKeyChanged( QVariant ) ), this, SLOT( onValueChanged( QVariant ) ) ); | ||
| } | ||
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