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qgsvaluerelationwidgetwrapper.cpp
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qgsvaluerelationwidgetwrapper.cpp
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/***************************************************************************
qgsvaluerelationwidgetwrapper.cpp
--------------------------------------
Date : 5.1.2014
Copyright : (C) 2014 Matthias Kuhn
Email : matthias at opengis dot ch
***************************************************************************
* *
* 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 "qgsvaluerelationwidgetwrapper.h"
#include "qgis.h"
#include "qgsfields.h"
#include "qgsproject.h"
#include "qgsvaluerelationwidgetfactory.h"
#include "qgsvectorlayer.h"
#include "qgsfilterlineedit.h"
#include "qgsfeatureiterator.h"
#include "qgsvaluerelationfieldformatter.h"
#include <QStringListModel>
#include <QCompleter>
QgsValueRelationWidgetWrapper::QgsValueRelationWidgetWrapper( QgsVectorLayer *vl, int fieldIdx, QWidget *editor, QWidget *parent )
: QgsEditorWidgetWrapper( vl, fieldIdx, editor, parent )
{
}
QVariant QgsValueRelationWidgetWrapper::value() const
{
QVariant v;
if ( mComboBox )
{
int cbxIdx = mComboBox->currentIndex();
if ( cbxIdx > -1 )
{
v = mComboBox->currentData();
}
}
if ( mListWidget )
{
QStringList selection;
for ( int i = 0; i < mListWidget->count(); ++i )
{
QListWidgetItem *item = mListWidget->item( i );
if ( item->checkState() == Qt::Checked )
selection << item->data( Qt::UserRole ).toString();
}
v = selection.join( QStringLiteral( "," ) ).prepend( '{' ).append( '}' );
}
if ( mLineEdit )
{
Q_FOREACH ( const QgsValueRelationFieldFormatter::ValueRelationItem &item, mCache )
{
if ( item.value == mLineEdit->text() )
{
v = item.key;
break;
}
}
}
return v;
}
QWidget *QgsValueRelationWidgetWrapper::createWidget( QWidget *parent )
{
if ( config( QStringLiteral( "AllowMulti" ) ).toBool() )
{
return new QListWidget( parent );
}
else if ( config( QStringLiteral( "UseCompleter" ) ).toBool() )
{
return new QgsFilterLineEdit( parent );
}
{
return new QComboBox( parent );
}
}
void QgsValueRelationWidgetWrapper::initWidget( QWidget *editor )
{
mCache = QgsValueRelationFieldFormatter::createCache( config() );
mComboBox = qobject_cast<QComboBox *>( editor );
mListWidget = qobject_cast<QListWidget *>( editor );
mLineEdit = qobject_cast<QLineEdit *>( editor );
if ( mComboBox )
{
if ( config( QStringLiteral( "AllowNull" ) ).toBool() )
{
mComboBox->addItem( tr( "(no selection)" ), QVariant( field().type() ) );
}
Q_FOREACH ( const QgsValueRelationFieldFormatter::ValueRelationItem &element, mCache )
{
mComboBox->addItem( element.value, element.key );
}
connect( mComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ),
this, static_cast<void ( QgsEditorWidgetWrapper::* )()>( &QgsEditorWidgetWrapper::emitValueChanged ) );
}
else if ( mListWidget )
{
Q_FOREACH ( const QgsValueRelationFieldFormatter::ValueRelationItem &element, mCache )
{
QListWidgetItem *item = nullptr;
item = new QListWidgetItem( element.value );
item->setData( Qt::UserRole, element.key );
mListWidget->addItem( item );
}
connect( mListWidget, &QListWidget::itemChanged, this, static_cast<void ( QgsEditorWidgetWrapper::* )()>( &QgsEditorWidgetWrapper::emitValueChanged ) );
}
else if ( mLineEdit )
{
QStringList values;
values.reserve( mCache.size() );
Q_FOREACH ( const QgsValueRelationFieldFormatter::ValueRelationItem &i, mCache )
{
values << i.value;
}
QStringListModel *m = new QStringListModel( values, mLineEdit );
QCompleter *completer = new QCompleter( m, mLineEdit );
completer->setCaseSensitivity( Qt::CaseInsensitive );
mLineEdit->setCompleter( completer );
connect( mLineEdit, &QLineEdit::textChanged, this, [ = ]( const QString & value ) { emit valueChanged( value ); } );
}
}
bool QgsValueRelationWidgetWrapper::valid() const
{
return mListWidget || mLineEdit || mComboBox;
}
void QgsValueRelationWidgetWrapper::setValue( const QVariant &value )
{
if ( mListWidget )
{
QStringList checkList( QgsValueRelationFieldFormatter::valueToStringList( value ) );
for ( int i = 0; i < mListWidget->count(); ++i )
{
QListWidgetItem *item = mListWidget->item( i );
item->setCheckState( checkList.contains( item->data( Qt::UserRole ).toString() ) ? Qt::Checked : Qt::Unchecked );
}
}
else if ( mComboBox )
{
mComboBox->setCurrentIndex( mComboBox->findData( value ) );
}
else if ( mLineEdit )
{
Q_FOREACH ( QgsValueRelationFieldFormatter::ValueRelationItem i, mCache )
{
if ( i.key == value )
{
mLineEdit->setText( i.value );
break;
}
}
}
}
void QgsValueRelationWidgetWrapper::showIndeterminateState()
{
if ( mListWidget )
{
mListWidget->blockSignals( true );
for ( int i = 0; i < mListWidget->count(); ++i )
{
mListWidget->item( i )->setCheckState( Qt::PartiallyChecked );
}
mListWidget->blockSignals( false );
}
else if ( mComboBox )
{
whileBlocking( mComboBox )->setCurrentIndex( -1 );
}
else if ( mLineEdit )
{
whileBlocking( mLineEdit )->clear();
}
}
void QgsValueRelationWidgetWrapper::setEnabled( bool enabled )
{
if ( mEnabled == enabled )
return;
mEnabled = enabled;
if ( mListWidget )
{
for ( int i = 0; i < mListWidget->count(); ++i )
{
QListWidgetItem *item = mListWidget->item( i );
if ( enabled )
item->setFlags( item->flags() | Qt::ItemIsEnabled );
else
item->setFlags( item->flags() & ~Qt::ItemIsEnabled );
}
}
else
QgsEditorWidgetWrapper::setEnabled( enabled );
}