QGIS API Documentation  2.99.0-Master (01468d0)
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 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 
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 
27 {
28 }
29 
31 {
32  QVariant value;
33 
34  if ( mComboBox )
35  value = mComboBox->currentData();
36 
37  if ( mLineEdit )
38  {
39  if ( mLineEdit->text() == QgsApplication::nullRepresentation() )
40  value = QVariant( field().type() );
41  else
42  value = mLineEdit->text();
43  }
44 
45  return value;
46 }
47 
48 QWidget *QgsUniqueValuesWidgetWrapper::createWidget( QWidget *parent )
49 {
50  if ( config( QStringLiteral( "Editable" ) ).toBool() )
51  return new QgsFilterLineEdit( parent );
52  else
53  return new QComboBox( parent );
54 }
55 
57 {
58  mComboBox = qobject_cast<QComboBox *>( editor );
59  mLineEdit = qobject_cast<QLineEdit *>( editor );
60 
61  QStringList sValues;
62 
63  QSet< QVariant> values = layer()->uniqueValues( fieldIdx() );
64 
65  Q_FOREACH ( const QVariant &v, values )
66  {
67  if ( mComboBox )
68  {
69  mComboBox->addItem( v.toString(), v );
70  }
71 
72  if ( mLineEdit )
73  {
74  sValues << v.toString();
75  }
76  }
77 
78  if ( mLineEdit )
79  {
80  QgsFilterLineEdit *fle = qobject_cast<QgsFilterLineEdit *>( editor );
81  if ( fle && !( field().type() == QVariant::Int || field().type() == QVariant::Double || field().type() == QVariant::LongLong || field().type() == QVariant::Date ) )
82  {
84  }
85 
86  QCompleter *c = new QCompleter( sValues );
87  c->setCaseSensitivity( Qt::CaseInsensitive );
88  c->setCompletionMode( QCompleter::PopupCompletion );
89  mLineEdit->setCompleter( c );
90 
91  connect( mLineEdit, &QLineEdit::textChanged, this,
92  static_cast<void ( QgsEditorWidgetWrapper::* )( const QString & )>( &QgsEditorWidgetWrapper::valueChanged ) );
93  }
94 
95  if ( mComboBox )
96  {
97  connect( mComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ),
98  this, static_cast<void ( QgsEditorWidgetWrapper::* )()>( &QgsEditorWidgetWrapper::valueChanged ) );
99  }
100 }
101 
103 {
104  return mComboBox || mLineEdit;
105 }
106 
108 {
109  if ( mComboBox )
110  {
111  whileBlocking( mComboBox )->setCurrentIndex( -1 );
112  }
113  if ( mLineEdit )
114  {
115  whileBlocking( mLineEdit )->setText( QString() );
116  }
117 }
118 
120 {
121  if ( mComboBox )
122  {
123  mComboBox->setCurrentIndex( mComboBox->findData( value ) );
124  }
125 
126  if ( mLineEdit )
127  {
128  if ( value.isNull() )
129  mLineEdit->setText( QgsApplication::nullRepresentation() );
130  else
131  mLineEdit->setText( value.toString() );
132  }
133 }
void showIndeterminateState() override
Sets the widget to display in an indeterminate "mixed value" state.
void valueChanged()
Will call the value() method to determine the emitted value.
QgsField field() const
Access the field.
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.
QSet< QVariant > uniqueValues(int fieldIndex, int limit=-1) const override
Calculates a list of unique values contained within an attribute in the layer.
QVariantMap config() const
Returns the whole config.
void initWidget(QWidget *editor) override
This method should initialize the editor widget with runtime data.
QLineEdit subclass with built in support for clearing the widget&#39;s value and handling custom null val...
static QString nullRepresentation()
This string is used to represent the value NULL throughout QGIS.
void setValue(const QVariant &value) override
QgsUniqueValuesWidgetWrapper(QgsVectorLayer *vl, int fieldIdx, QWidget *editor=nullptr, QWidget *parent=nullptr)
QVariant value() const override
Will be used to access the widget&#39;s value.
QgsSignalBlocker< Object > whileBlocking(Object *object)
Temporarily blocks signals from a QObject while calling a single method from the object.
Definition: qgis.h:187
bool valid() const override
Return true if the widget has been properly initialized.
int fieldIdx() const
Access the field index.
void setNullValue(const QString &nullValue)
Sets the string representation for null values in the widget.
QgsVectorLayer * layer() const
Access the QgsVectorLayer, you are working on.
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:93