QGIS API Documentation  2.15.0-Master (1f0fce7)
qgsenumerationwidgetwrapper.cpp
Go to the documentation of this file.
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 
22  : QgsEditorWidgetWrapper( vl, fieldIdx, editor, parent )
23  , mComboBox( nullptr )
24 {
25 }
26 
27 
29 {
31 
32  if ( mComboBox )
33  value = mComboBox->itemData( mComboBox->currentIndex() );
34 
35  return value;
36 }
37 
39 {
40  if ( mComboBox )
41  {
42  whileBlocking( mComboBox )->setCurrentIndex( -1 );
43  }
44 }
45 
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 
int fieldIdx() const
Access the field index.
void valueChanged()
Will call the value() method to determine the emitted value.
virtual void enumValues(int index, QStringList &enumList)
Returns the possible enum values of an attribute.
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.
void addItem(const QString &text, const QVariant &userData)
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.
QVariant itemData(int index, int role) const
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:332
int findData(const QVariant &data, int role, QFlags< Qt::MatchFlag > flags) const
void setValue(const QVariant &value) override
QgsVectorLayer * layer() const
Access the QgsVectorLayer, you are working on.
QgsVectorDataProvider * dataProvider()
Returns the data provider.
void showIndeterminateState() override
Sets the widget to display in an indeterminate "mixed value" state.
bool connect(const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)
QObject * parent() const
Represents a vector layer which manages a vector based data sets.
QgsEnumerationWidgetWrapper(QgsVectorLayer *vl, int fieldIdx, QWidget *editor=nullptr, QWidget *parent=nullptr)