QGIS API Documentation  2.99.0-Master (37c43df)
qgsenumerationwidgetwrapper.cpp
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1 /***************************************************************************
2  qgsenumerationwidgetwrapper.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 "qgsvectordataprovider.h"
20 
21 QgsEnumerationWidgetWrapper::QgsEnumerationWidgetWrapper( QgsVectorLayer* vl, int fieldIdx, QWidget* editor, QWidget* parent )
22  : QgsEditorWidgetWrapper( vl, fieldIdx, editor, parent )
23  , mComboBox( nullptr )
24 {
25 }
26 
27 
29 {
30  QVariant value;
31 
32  if ( mComboBox )
33  value = mComboBox->currentData();
34 
35  return value;
36 }
37 
39 {
40  if ( mComboBox )
41  {
42  whileBlocking( mComboBox )->setCurrentIndex( -1 );
43  }
44 }
45 
46 QWidget* QgsEnumerationWidgetWrapper::createWidget( QWidget* parent )
47 {
48  return new QComboBox( parent );
49 }
50 
52 {
53  mComboBox = qobject_cast<QComboBox*>( editor );
54 
55  if ( mComboBox )
56  {
57  QStringList enumValues;
58  layer()->dataProvider()->enumValues( fieldIdx(), enumValues );
59 
60  Q_FOREACH ( const QString& s, enumValues )
61  {
62  mComboBox->addItem( s, s );
63  }
64  connect( mComboBox, SIGNAL( currentIndexChanged( int ) ), this, SLOT( valueChanged() ) );
65  }
66 }
67 
69 {
70  return mComboBox;
71 }
72 
74 {
75  if ( mComboBox )
76  {
77  mComboBox->setCurrentIndex( mComboBox->findData( value ) );
78  }
79 }
80 
void valueChanged()
Will call the value() method to determine the emitted value.
Manages an editor widget Widget and wrapper share the same parent.
void initWidget(QWidget *editor) override
This method should initialize the editor widget with runtime data.
bool valid() const override
Return true if the widget has been properly initialized.
QVariant value() const override
Will be used to access the widget&#39;s value.
QWidget * createWidget(QWidget *parent) override
This method should create a new widget with the provided parent.
QgsSignalBlocker< Object > whileBlocking(Object *object)
Temporarily blocks signals from a QObject while calling a single method from the object.
Definition: qgis.h:176
void setValue(const QVariant &value) override
virtual void enumValues(int index, QStringList &enumList) const
Returns the possible enum values of an attribute.
QgsVectorDataProvider * dataProvider()
Returns the data provider.
int fieldIdx() const
Access the field index.
QgsVectorLayer * layer() const
Access the QgsVectorLayer, you are working on.
void showIndeterminateState() override
Sets the widget to display in an indeterminate "mixed value" state.
Represents a vector layer which manages a vector based data sets.
QgsEnumerationWidgetWrapper(QgsVectorLayer *vl, int fieldIdx, QWidget *editor=nullptr, QWidget *parent=nullptr)