Add hasDefaultValues method to QgsDataDefined, add some tests

python/core/qgsdatadefined.sip

@@ -24,6 +24,13 @@ class QgsDataDefined
                     const QString& field = QString() );
 
     ~QgsDataDefined();
+    
+    /**Returns whether the data defined container is set to all the default
+     * values, ie, disabled, with empty expression and no assigned field
+     * @returns true if data defined container is set to default values
+     * @note added in QGIS 2.7
+     */
+    bool hasDefaultValues() const;   
 
     bool isActive() const;
     void setActive( bool active );

src/core/qgsdatadefined.cpp

@@ -39,6 +39,11 @@ QgsDataDefined::~QgsDataDefined()
   delete mExpression;
 }
 
+bool QgsDataDefined::hasDefaultValues() const
+{
+  return ( !mActive && !mUseExpression && mExpressionString.isEmpty() && mField.isEmpty() );
+}
+
 void QgsDataDefined::setExpressionString( const QString &expr )
 {
   mExpressionString = expr;

src/core/qgsdatadefined.h

@@ -46,6 +46,13 @@ class CORE_EXPORT QgsDataDefined
 
     ~QgsDataDefined();
 
+    /**Returns whether the data defined container is set to all the default
+     * values, ie, disabled, with empty expression and no assigned field
+     * @returns true if data defined container is set to default values
+     * @note added in QGIS 2.7
+     */
+    bool hasDefaultValues() const;
+
     bool isActive() const { return mActive; }
     void setActive( bool active ) { mActive = active; }
 

tests/src/core/CMakeLists.txt

@@ -104,6 +104,7 @@ ADD_QGIS_TEST(vectorlayertest testqgsvectorlayer.cpp)
 ADD_QGIS_TEST(rulebasedrenderertest testqgsrulebasedrenderer.cpp)
 ADD_QGIS_TEST(ziplayertest testziplayer.cpp)
 ADD_QGIS_TEST(dataitemtest testqgsdataitem.cpp)
+ADD_QGIS_TEST(datadefined testqgsdatadefined.cpp)
 ADD_QGIS_TEST(composerobject testqgscomposerobject.cpp)
 ADD_QGIS_TEST(composerutils testqgscomposerutils.cpp)
 ADD_QGIS_TEST(compositiontest testqgscomposition.cpp)

tests/src/core/testqgsdatadefined.cpp

@@ -0,0 +1,114 @@
+/***************************************************************************
+     testqgsdatadefined.cpp
+     ----------------------
+    Date                 : November 2014
+    Copyright            : (C) 2014 Nyall Dawson
+    Email                : nyall dot dawson at gmail dot com
+ ***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+#include <QtTest>
+#include <QObject>
+#include <QString>
+#include <QStringList>
+#include <QSettings>
+
+#include <qgsdatadefined.h>
+
+/** \ingroup UnitTests
+ * Unit tests for QgsDataDefined
+ */
+class TestQgsDataDefined: public QObject
+{
+    Q_OBJECT;
+
+  private slots:
+    void initTestCase();// will be called before the first testfunction is executed.
+    void cleanupTestCase();// will be called after the last testfunction was executed.
+    void init();// will be called before each testfunction is executed.
+    void cleanup();// will be called after every testfunction.
+    void create();//test creating a data defined container
+    void gettersSetters(); //test getters and setters
+    void defaultValues(); //test hasDefaultValues method
+
+  private:
+};
+
+void TestQgsDataDefined::initTestCase()
+{
+
+}
+
+void TestQgsDataDefined::cleanupTestCase()
+{
+
+}
+
+void TestQgsDataDefined::init()
+{
+
+}
+
+void TestQgsDataDefined::cleanup()
+{
+
+}
+
+void TestQgsDataDefined::create()
+{
+  QgsDataDefined* dd = new QgsDataDefined( true, true, QString( "exp" ), QString( "field" ) );
+  QVERIFY( dd->isActive() );
+  QVERIFY( dd->useExpression() );
+  QCOMPARE( dd->expressionString(), QString( "exp" ) );
+  QCOMPARE( dd->field(), QString( "field" ) );
+  delete dd;
+}
+
+void TestQgsDataDefined::gettersSetters()
+{
+  QgsDataDefined dd;
+  dd.setActive( false );
+  QVERIFY( !dd.isActive() );
+  dd.setActive( true );
+  QVERIFY( dd.isActive() );
+
+  dd.setUseExpression( false );
+  QVERIFY( !dd.useExpression() );
+  dd.setUseExpression( true );
+  QVERIFY( dd.useExpression() );
+
+  dd.setExpressionString( QString( "expression" ) );
+  QCOMPARE( dd.expressionString(), QString( "expression" ) );
+
+  dd.setField( QString( "field" ) );
+  QCOMPARE( dd.field(), QString( "field" ) );
+}
+
+void TestQgsDataDefined::defaultValues()
+{
+  QgsDataDefined* dd = new QgsDataDefined();
+  QVERIFY( dd->hasDefaultValues() );
+  dd->setActive( true );
+  QVERIFY( !dd->hasDefaultValues() );
+  delete dd;
+  dd = new QgsDataDefined();
+  dd->setUseExpression( true );
+  QVERIFY( !dd->hasDefaultValues() );
+  delete dd;
+  dd = new QgsDataDefined();
+  dd->setExpressionString( QString( "expression" ) );
+  QVERIFY( !dd->hasDefaultValues() );
+  delete dd;
+  dd = new QgsDataDefined();
+  dd->setField( QString( "field" ) );
+  QVERIFY( !dd->hasDefaultValues() );
+  delete dd;
+}
+
+QTEST_MAIN( TestQgsDataDefined )
+#include "testqgsdatadefined.moc"