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class QgsFieldExpressionWidget : QWidget
{
%TypeHeaderCode
#include "qgsfieldexpressionwidget.h"
%End
public:
/**
* @brief QgsFieldExpressionWidget creates a widget with a combo box to display the fields and expression and a button to open the expression dialog
*/
explicit QgsFieldExpressionWidget( QWidget *parent /TransferThis/ = 0 );
//! define the title used in the expression dialog
void setExpressionDialogTitle( QString title );
//! return the title used for the expression dialog
const QString expressionDialogTitle();
//! setFilters allows fitering according to the type of field
void setFilters( QgsFieldProxyModel::Filters filters );
void setLeftHandButtonStyle( bool isLeft );
//! currently used filter on list of fields
QgsFieldProxyModel::Filters filters();
//! set the geometry calculator used in the expression dialog
void setGeomCalculator( const QgsDistanceArea &da );
/**
* @brief currentField returns the currently selected field or expression if allowed
* @param isExpression determines if the string returned is the name of a field or an expression
* @param isValid determines if the expression (or field) returned is valid
*/
QString currentField( bool *isExpression = 0, bool *isValid = 0 );
/**
* Return true if the current expression is valid
*/
bool isValidExpression( QString *expressionError = 0 );
bool isExpression();
/**
* Return the current text that is set in the expression area
*/
QString currentText();
//! Returns the currently used layer
QgsVectorLayer* layer();
signals:
//! the signal is emitted when the currently selected field changes
void fieldChanged( QString fieldName );
//! fieldChanged signal with indication of the validity of the expression
void fieldChanged( QString fieldName, bool isValid );
// void returnPressed();
public slots:
//! set the layer used to display the fields and expression
void setLayer( QgsVectorLayer* layer );
//! convenience slot to connect QgsMapLayerComboBox layer signal
void setLayer( QgsMapLayer* layer );
//! sets the current field or expression in the widget
void setField( const QString &fieldName );
protected slots:
//! open the expression dialog to edit the current or add a new expression
void editExpression();
//! when expression is edited by the user in the line edit, it will be checked for validity
void expressionEdited( const QString expression );
//! when expression has been edited (finished) it will be added to the model
void expressionEditingFinished();
void currentFieldChanged();
/**
* @brief updateLineEditStyle will re-style (color/font) the line edit depending on content and status
* @param expression if expression is given it will be evaluated for the given string, otherwise it takes
* current expression from the model
*/
void updateLineEditStyle( const QString expression = QString() );
bool isExpressionValid( const QString expressionStr );
protected:
void changeEvent( QEvent* event );
};
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