void QgsDataDefinedButton::showExpressionDialog()
{
QgsExpressionBuilderDialog d( const_cast<QgsVectorLayer*>( mVectorLayer ), getExpression() );
if ( d.exec() == QDialog::Accepted )
{
QString newExp = d.expressionText();
setExpression( d.expressionText().trimmed() );
bool hasExp = !newExp.isEmpty();
setUseExpression( hasExp );
setActive( hasExp );
updateGui();
}
activateWindow(); // reset focus to parent window
}
void QgsDataDefinedButton::showAssistant()
{
if ( !mAssistant.data() )
return;
if ( mAssistant->exec() == QDialog::Accepted )
{
QgsDataDefined dd = mAssistant->dataDefined();
setUseExpression( dd.useExpression() );
setActive( dd.isActive() );
if ( dd.isActive() && dd.useExpression() )
setExpression( dd.expressionString() );
else if ( dd.isActive() )
setField( dd.field() );
updateGui();
}
activateWindow(); // reset focus to parent window
}
void QgsDataDefinedButton::updateGui()
{
QString oldDef = mCurrentDefinition;
QString newDef( "" );
bool hasExp = !getExpression().isEmpty();
bool hasField = !getField().isEmpty();
if ( useExpression() && !hasExp )
{
setActive( false );
setUseExpression( false );
}
else if ( !useExpression() && !hasField )
{
setActive( false );
}
QIcon icon = mIconDataDefine;
QString deftip = tr( "undefined" );
if ( useExpression() && hasExp )
{
icon = isActive() ? mIconDataDefineExpressionOn : mIconDataDefineExpression;
newDef = deftip = getExpression();
QgsExpression exp( getExpression() );
if ( exp.hasParserError() )
{
setActive( false );
icon = mIconDataDefineExpressionError;
deftip = tr( "Parse error: %1" ).arg( exp.parserErrorString() );
newDef = "";
}
}
else if ( !useExpression() && hasField )
{
icon = isActive() ? mIconDataDefineOn : mIconDataDefine;
newDef = deftip = getField();
if ( !mFieldNameList.contains( getField() ) )
{
setActive( false );
icon = mIconDataDefineError;
deftip = tr( "'%1' field missing" ).arg( getField() );
newDef = "";
}
}
setIcon( icon );
// update and emit current definition
if ( newDef != oldDef )
{
mCurrentDefinition = newDef;
emit dataDefinedChanged( mCurrentDefinition );
}
// build full description for tool tip and popup dialog
mFullDescription = tr( "<b><u>Data defined override</u></b><br>" );
mFullDescription += tr( "<b>Active: </b>%1 <i>(ctrl|right-click toggles)</i><br>" ).arg( isActive() ? tr( "yes" ) : tr( "no" ) );
if ( !mUsageInfo.isEmpty() )
{
mFullDescription += tr( "<b>Usage:</b><br>%1<br>" ).arg( mUsageInfo );
}
if ( !mInputDescription.isEmpty() )
{
mFullDescription += tr( "<b>Expected input:</b><br>%1<br>" ).arg( mInputDescription );
}
if ( !mDataTypesString.isEmpty() )
{
mFullDescription += tr( "<b>Valid input types:</b><br>%1<br>" ).arg( mDataTypesString );
}
QString deftype( "" );
if ( deftip != tr( "undefined" ) )
{
deftype = QString( " (%1)" ).arg( useExpression() ? tr( "expression" ) : tr( "field" ) );
}
// truncate long expressions, or tool tip may be too wide for screen
if ( deftip.length() > 75 )
{
deftip.truncate( 75 );
deftip.append( "..." );
}
mFullDescription += tr( "<b>Current definition %1:</b><br>%2" ).arg( deftype ).arg( deftip );
setToolTip( mFullDescription );
}
void QgsDataDefinedButton::menuActionTriggered( QAction* action )
{
if ( action == mActionActive )
{
setActive( mActionActive->data().toBool() );
updateGui();
}
else if ( action == mActionDescription )
{
showDescriptionDialog();
}
else if ( action == mActionExpDialog )
{
showExpressionDialog();
}
else if ( action == mActionExpression )
{
setUseExpression( true );
setActive( true );
updateGui();
}
else if ( action == mActionCopyExpr )
{
QApplication::clipboard()->setText( getExpression() );
}
else if ( action == mActionPasteExpr )
{
QString exprString = QApplication::clipboard()->text();
if ( !exprString.isEmpty() )
{
setExpression( exprString );
setUseExpression( true );
setActive( true );
updateGui();
}
}
else if ( action == mActionClearExpr )
{
// only deactivate if defined expression is being used
if ( isActive() && useExpression() )
{
setUseExpression( false );
setActive( false );
}
setExpression( QString( "" ) );
updateGui();
}
else if ( mFieldsMenu->actions().contains( action ) ) // a field name clicked
{
if ( action->isEnabled() )
{
if ( getField() != action->text() )
{
setField( action->data().toString() );
}
setUseExpression( false );
setActive( true );
updateGui();
}
}
}
