edu.caltech.ipac.firefly.ui.input.ListBoxInputField.java Source code

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Here is the source code for edu.caltech.ipac.firefly.ui.input.ListBoxInputField.java

Source

/*
 * License information at https://github.com/Caltech-IPAC/firefly/blob/master/License.txt
 */
package edu.caltech.ipac.firefly.ui.input;

import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.FocusWidget;
import com.google.gwt.user.client.ui.ListBox;
import edu.caltech.ipac.firefly.core.Preferences;
import edu.caltech.ipac.util.ComparisonUtil;
import edu.caltech.ipac.util.dd.EnumFieldDef;
import edu.caltech.ipac.util.dd.FieldDef;

import java.util.List;

/**
 * @author Trey Roby
 * $Id: ListBoxInputField.java,v 1.6 2011/04/27 20:55:34 roby Exp $
 */
public class ListBoxInputField extends InputField {

    private ListBox _listBox = new ListBox();
    private final FieldDef _fieldDef;
    private final List<EnumFieldDef.Item> _items;
    private int _selectedIdx;
    private FieldLabel _label = null;

    public ListBoxInputField(EnumFieldDef fieldDef) {
        _fieldDef = fieldDef;
        initWidget(_listBox);

        //list box setup
        _items = ((EnumFieldDef) _fieldDef).getEnumValues();
        for (EnumFieldDef.Item item : _items) {
            _listBox.addItem(item.getTitle());
        }
        _listBox.setTitle(_fieldDef.getShortDesc());
        reset();

        _listBox.addChangeHandler(new ChangeHandler() {
            public void onChange(ChangeEvent event) {
                _selectedIdx = _listBox.getSelectedIndex();
                ValueChangeEvent.fire(ListBoxInputField.this, _selectedIdx + "");
                updatePref();
            }
        });

        // label setup
    }

    public FieldDef getFieldDef() {
        return _fieldDef;
    }

    public FieldLabel getFieldLabel() {
        if (_label == null) {
            if (_fieldDef.isTextImmutable()) {
                _label = new HTMLImmutableLabel(_fieldDef.getLabel(), _fieldDef.getShortDesc());
            } else {
                _label = new HTMLFieldLabel(_fieldDef.getLabel(), _fieldDef.getShortDesc());
            }
        }
        return _label;
    }

    public FocusWidget getFocusWidget() {
        return _listBox;
    }

    public String getValue() {
        return _items.get(_selectedIdx).getName();
    }

    public void setValue(String v) {
        int cnt = 0;
        for (EnumFieldDef.Item item : _items) {
            if (v.equals(item.getName())) {
                int oldSelectedIdx = _selectedIdx;
                _selectedIdx = cnt;
                _listBox.setSelectedIndex(_selectedIdx);
                if (oldSelectedIdx != _selectedIdx) {
                    ValueChangeEvent.fire(ListBoxInputField.this, _selectedIdx + "");
                }
                updatePref();
            }
            cnt++;
        }
    }

    public void reset() {
        setValue(_fieldDef.getDefaultValueAsString());
    }

    public boolean validate() {
        return true;
    }

    private void updatePref() {
        if (_fieldDef.isUsingPreference()) {
            String value = getValue();
            String key = _fieldDef.getPreferenceKey();
            if (!ComparisonUtil.equals(value, Preferences.get(key))) {
                Preferences.set(key, value);
            }
        }
    }

    public void forceInvalid(String reason) {
    }

    public HandlerRegistration addValueChangeHandler(ValueChangeHandler<String> h) {
        return addHandler(h, ValueChangeEvent.getType());
    }

}