ComboWidget.java

package org.uva.student.calinwouter.qlqls.qls.widgets.question.boolwidgets;

import org.uva.student.calinwouter.qlqls.ql.model.StateWrapper;
import org.uva.student.calinwouter.qlqls.ql.gui.widgets.IWidget;
import org.uva.student.calinwouter.qlqls.ql.QLInterpreter;
import org.uva.student.calinwouter.qlqls.ql.model.VariableTable;
import org.uva.student.calinwouter.qlqls.ql.types.BooleanValue;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

public class ComboWidget implements IWidget {
    private final String questionIdentifier;
    private final QLInterpreter qlInterpreter;
    private final StateWrapper stateWrapper;
    private final JComboBox yesNoComboBox;

    public Component getWidgetComponent() {
        return yesNoComboBox;
    }

    public void resetValue() {
        yesNoComboBox.setSelectedIndex(-1);
    }

    private JComboBox createYesNoCombo(String[] comboValues) {
        return new JComboBox<String>(comboValues);
    }

    private void setComboValue(VariableTable variableTable) {
        final boolean isFirstSelected = yesNoComboBox.getSelectedIndex() == 0;
        final BooleanValue selectionBasedValue = new BooleanValue(isFirstSelected);
        variableTable.setVariable(questionIdentifier, selectionBasedValue);
    }

    private ItemListener createComboChangeListener() {
        return new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                VariableTable currentVariableTable = stateWrapper.getVariableTable();
                setComboValue(currentVariableTable);
                VariableTable newVariableTable = qlInterpreter.interpret(currentVariableTable);
                stateWrapper.setVariableTable(newVariableTable);
            }
        };
    }

    public ComboWidget(String questionIdentifier, QLInterpreter qlInterpreter, StateWrapper stateWrapper, String yesLabel, String noLabel) {
        this.questionIdentifier = questionIdentifier;
        this.qlInterpreter = qlInterpreter;
        this.stateWrapper = stateWrapper;
        this.yesNoComboBox = createYesNoCombo(new String[] { yesLabel, noLabel });
        resetValue();
        yesNoComboBox.addItemListener(createComboChangeListener());
    }
}