QGIS API Documentation  3.18.1-Zürich (202f1bf7e5)
qgsattributeformlegacyinterface.cpp
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1 /***************************************************************************
2  qgsattributeformlegacyinterface.cpp
3  --------------------------------------
4  Date : 13.5.2014
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 "qgspythonrunner.h"
19 #include "qgsattributeform.h"
20 
21 #include <QString>
22 #include <QDateTime>
23 #include <QRegExp>
24 
25 QgsAttributeFormLegacyInterface::QgsAttributeFormLegacyInterface( const QString &function, const QString &pyFormName, QgsAttributeForm *form )
27  , mPyFunctionName( function )
28  , mPyFormVarName( pyFormName )
29 {
30  static int sLayerCounter = 0;
31  mPyLayerVarName = QStringLiteral( "_qgis_layer_%1_%2" ).arg( form->layer()->id() ).arg( sLayerCounter++ );
32  mPyLayerVarName.replace( QRegExp( "[^a-zA-Z0-9_]" ), QStringLiteral( "_" ) ); // clean identifier
33 
34  QString initLayer = QStringLiteral( "%1 = sip.wrapinstance( %2, qgis.core.QgsVectorLayer )" )
35  .arg( mPyLayerVarName )
36  .arg( ( quint64 ) form->layer() );
37 
38  QgsPythonRunner::run( initLayer );
39 }
40 
42 {
43  QString delLayer = QStringLiteral( "del %1" ).arg( mPyLayerVarName );
44  QgsPythonRunner::run( delLayer );
45 }
46 
48 {
49  QDialogButtonBox *buttonBox = form()->findChild<QDialogButtonBox *>();
50  if ( buttonBox )
51  {
52  // If the init function did not call disconnect, we do it here before reconnecting
53  // If it did call disconnect, then the call will just do nothing
54  QObject::disconnect( buttonBox, &QDialogButtonBox::accepted, form(), &QgsAttributeForm::save );
55  QObject::connect( buttonBox, &QDialogButtonBox::accepted, form(), &QgsAttributeForm::save );
56  }
57 
58  // Generate the unique ID of this feature. We used to use feature ID but some providers
59  // return a ID that is an invalid python variable when we have new unsaved features.
60  QDateTime dt = QDateTime::currentDateTime();
61  QString pyFeatureVarName = QStringLiteral( "_qgis_feature_%1" ).arg( dt.toString( QStringLiteral( "yyyyMMddhhmmsszzz" ) ) );
62  QString initFeature = QStringLiteral( "%1 = sip.wrapinstance( %2, qgis.core.QgsFeature )" )
63  .arg( pyFeatureVarName )
64  .arg( ( quint64 ) & form()->feature() );
65 
66  QgsPythonRunner::run( initFeature );
67 
68  QString expr = QStringLiteral( "%1( %2, %3, %4)" )
69  .arg( mPyFunctionName,
70  mPyFormVarName,
71  mPyLayerVarName,
72  pyFeatureVarName );
73 
74  QgsPythonRunner::run( expr );
75 
76  QString delFeature = QStringLiteral( "del %1" ).arg( pyFeatureVarName );
77  QgsPythonRunner::run( delFeature );
78 }
QgsAttributeFormLegacyInterface(const QString &function, const QString &pyFormName, QgsAttributeForm *form)
QgsVectorLayer * layer()
Returns the layer for which this form is shown.
bool save()
Save all the values from the editors to the layer.
QString id() const
Returns the layer's unique ID, which is used to access this layer from QgsProject.
static bool run(const QString &command, const QString &messageOnError=QString())
Execute a Python statement.