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qgsuniquevaluewidgetwrapper.cpp
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1 /***************************************************************************
2  qgsuniquevaluewidgetwrapper.cpp
3  --------------------------------------
4  Date : 5.1.2014
5  Copyright : (C) 2014 Matthias Kuhn
6  Email : matthias dot kuhn at gmx 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 
18 #include "qgsvectorlayer.h"
19 #include "qgsfilterlineedit.h"
20 
21 #include <QCompleter>
22 #include <QSettings>
23 
24 QgsUniqueValuesWidgetWrapper::QgsUniqueValuesWidgetWrapper( QgsVectorLayer* vl, int fieldIdx, QWidget* editor, QWidget* parent )
25  : QgsEditorWidgetWrapper( vl, fieldIdx, editor, parent )
26  , mComboBox( NULL )
27  , mLineEdit( NULL )
28 {
29 }
30 
32 {
33  QVariant value;
34 
35  if ( mComboBox )
36  value = mComboBox->itemData( mComboBox->currentIndex() );
37 
38  if ( mLineEdit )
39  {
40  if ( mLineEdit->text() == QSettings().value( "qgis/nullValue", "NULL" ).toString() )
41  value = QVariant( field().type() );
42  else
43  value = mLineEdit->text();
44  }
45 
46  return value;
47 }
48 
49 QWidget* QgsUniqueValuesWidgetWrapper::createWidget( QWidget* parent )
50 {
51  if ( config( "Editable" ).toBool() )
52  return new QgsFilterLineEdit( parent );
53  else
54  return new QComboBox( parent );
55 }
56 
58 {
59  mComboBox = qobject_cast<QComboBox*>( editor );
60  mLineEdit = qobject_cast<QLineEdit*>( editor );
61 
62  QStringList sValues;
63 
64  QList<QVariant> values;
65 
66  layer()->uniqueValues( fieldIdx(), values );
67 
68  Q_FOREACH ( QVariant v, values )
69  {
70  if ( mComboBox )
71  {
72  mComboBox->addItem( v.toString(), v );
73  }
74 
75  if ( mLineEdit )
76  {
77  sValues << v.toString();
78  }
79  }
80 
81  if ( mLineEdit )
82  {
83  QgsFilterLineEdit* fle = qobject_cast<QgsFilterLineEdit*>( editor );
84  if ( fle && !( field().type() == QVariant::Int || field().type() == QVariant::Double || field().type() == QVariant::LongLong || field().type() == QVariant::Date ) )
85  {
86  fle->setNullValue( QSettings().value( "qgis/nullValue", "NULL" ).toString() );
87  }
88 
89  QCompleter* c = new QCompleter( sValues );
90  c->setCompletionMode( QCompleter::PopupCompletion );
91  mLineEdit->setCompleter( c );
92 
93  connect( mLineEdit, SIGNAL( textChanged( QString ) ), this, SLOT( valueChanged( QString ) ) );
94  }
95 
96  if ( mComboBox )
97  {
98  connect( mComboBox, SIGNAL( currentIndexChanged( int ) ), this, SLOT( valueChanged() ) );
99  }
100 }
101 
102 void QgsUniqueValuesWidgetWrapper::setValue( const QVariant& value )
103 {
104  if ( mComboBox )
105  {
106  mComboBox->setCurrentIndex( mComboBox->findData( value ) );
107  }
108 
109  if ( mLineEdit )
110  {
111  if ( value.isNull() )
112  mLineEdit->setText( QSettings().value( "qgis/nullValue", "NULL" ).toString() );
113  else
114  mLineEdit->setText( value.toString() );
115  }
116 }
void valueChanged()
Will call the value() method to determine the emitted value.
void uniqueValues(int index, QList< QVariant > &uniqueValues, int limit=-1)
Returns unique values for column.
Manages an editor widget Widget and wrapper share the same parent.
QWidget * createWidget(QWidget *parent) override
This method should create a new widget with the provided parent.
QgsVectorLayer * layer()
Access the QgsVectorLayer, you are working on.
QgsField field()
Access the field.
void initWidget(QWidget *editor) override
This method should initialize the editor widget with runtime data.
QVariant value() override
Will be used to access the widget's value.
const QgsEditorWidgetConfig config()
Returns the whole config.
Lineedit with builtin clear button.
void setNullValue(QString nullValue)
QgsUniqueValuesWidgetWrapper(QgsVectorLayer *vl, int fieldIdx, QWidget *editor=0, QWidget *parent=0)
void setValue(const QVariant &value) override
int fieldIdx()
Access the field index.
Represents a vector layer which manages a vector based data sets.
QVariant::Type type() const
Gets variant type of the field as it will be retrieved from data source.
Definition: qgsfield.cpp:64