void TestQgsPaintEffectRegistry::fetchEffects()
{
QgsPaintEffectRegistry* registry = QgsApplication::paintEffectRegistry();
QStringList effects = registry->effects();
QVERIFY( effects.contains( "Dummy" ) );
QgsPaintEffectAbstractMetadata* metadata = registry->effectMetadata( QStringLiteral( "Dummy" ) );
QCOMPARE( metadata->name(), QString( "Dummy" ) );
//metadata for bad effect
metadata = registry->effectMetadata( QStringLiteral( "bad effect" ) );
QVERIFY( !metadata );
}
void QgsPaintEffectPropertiesWidget::effectTypeChanged()
{
QgsPaintEffect* effect = mEffect;
if ( !effect )
return;
QString newEffectType = mEffectTypeCombo->currentData().toString();
if ( effect->type() == newEffectType )
return;
// get creation function for new effect from registry
QgsPaintEffectRegistry* registry = QgsApplication::paintEffectRegistry();
QgsPaintEffectAbstractMetadata* am = registry->effectMetadata( newEffectType );
if ( !am ) // check whether the metadata is assigned
return;
// change effect to a new (with different type)
// base new effect on existing effect's properties
QgsPaintEffect* newEffect = am->createPaintEffect( effect->properties() );
if ( !newEffect )
return;
updateEffectWidget( newEffect );
emit changeEffect( newEffect );
mEffect = newEffect;
}
void QgsPaintEffectPropertiesWidget::updateEffectWidget( QgsPaintEffect* effect )
{
if ( !effect )
{
stackedWidget->setCurrentWidget( pageDummy );
return;
}
if ( stackedWidget->currentWidget() != pageDummy )
{
// stop updating from the original widget
disconnect( stackedWidget->currentWidget(), SIGNAL( changed() ), this, SLOT( emitSignalChanged() ) );
stackedWidget->removeWidget( stackedWidget->currentWidget() );
}
QgsPaintEffectRegistry* registry = QgsApplication::paintEffectRegistry();
QgsPaintEffectAbstractMetadata* am = registry->effectMetadata( effect->type() );
if ( am )
{
QgsPaintEffectWidget* w = am->createWidget();
if ( w )
{
w->setPaintEffect( effect );
stackedWidget->addWidget( w );
stackedWidget->setCurrentWidget( w );
// start receiving updates from widget
connect( w, SIGNAL( changed() ), this, SLOT( emitSignalChanged() ) );
return;
}
}
// When anything is not right
stackedWidget->setCurrentWidget( pageDummy );
}
void QgsPaintEffectPropertiesWidget::populateEffectTypes()
{
QgsPaintEffectRegistry* registry = QgsApplication::paintEffectRegistry();
QStringList types = registry->effects();
Q_FOREACH ( const QString& type, types )
{
//don't show stack effect
if ( type == QLatin1String( "effectStack" ) )
continue;
mEffectTypeCombo->addItem( registry->effectMetadata( type )->visibleName(), type );
}
}
static bool _initWidgetFunction( const QString& name, QgsPaintEffectWidgetFunc f )
{
QgsPaintEffectRegistry* registry = QgsApplication::paintEffectRegistry();
QgsPaintEffectAbstractMetadata* abstractMetadata = registry->effectMetadata( name );
if ( !abstractMetadata )
{
QgsDebugMsg( QString( "Failed to find paint effect entry in registry: %1" ).arg( name ) );
return false;
}
QgsPaintEffectMetadata* metadata = dynamic_cast<QgsPaintEffectMetadata*>( abstractMetadata );
if ( !metadata )
{
QgsDebugMsg( QString( "Failed to cast paint effect's metadata: " ) .arg( name ) );
return false;
}
metadata->setWidgetFunction( f );
return true;
}
