org.polymap.rhei.field.DateTimeFormField.java Source code

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Here is the source code for org.polymap.rhei.field.DateTimeFormField.java

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/* 
 * polymap.org
 * Copyright 2010, Falko Brutigam, and other contributors as indicated
 * by the @authors tag.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * $Id: $
 */
package org.polymap.rhei.field;

import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.DateTime;

import org.polymap.rhei.form.IFormToolkit;

/**
 * A date/time form field based on the {@link DateTime} widget.
 * <p> 
 * FIXME - Implementation depends on Locale.GERMANY.
 *
 * @author <a href="http://www.polymap.de">Falko Brutigam</a>
 * @version ($Revision$)
 */
public class DateTimeFormField implements IFormField {

    private static Log log = LogFactory.getLog(DateTimeFormField.class);

    private IFormFieldSite site;

    private DateTime datetime;

    private boolean enabled = true;

    private Date loadedValue;

    /** Special value representing a "null" as the propety value. */
    private Date nullValue;

    public void init(IFormFieldSite _site) {
        this.site = _site;

        // The DateTime field supports seconds only, so we need the current
        // time without the millis for the nullValue in order to make it
        // comparable to the result of the DateTime
        Calendar cal = Calendar.getInstance(Locale.GERMANY);
        cal.set(Calendar.MILLISECOND, 0);
        this.nullValue = cal.getTime();
    }

    public void dispose() {
        datetime.dispose();
    }

    public Control createControl(Composite parent, IFormToolkit toolkit) {
        datetime = toolkit.createDateTime(parent, new Date(), SWT.MEDIUM | SWT.DROP_DOWN);
        datetime.setEnabled(enabled);
        //        datetime.setBackground( enabled ? FormEditorToolkit.textBackground : FormEditorToolkit.textBackgroundDisabled );

        // selection(modify) listener
        datetime.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                Calendar cal = Calendar.getInstance(Locale.GERMANY);
                cal.set(datetime.getYear(), datetime.getMonth(), datetime.getDay(), datetime.getHours(),
                        datetime.getMinutes(), datetime.getSeconds());
                Date date = cal.getTime();
                log.info("widgetSelected(): test= " + date);

                site.fireEvent(DateTimeFormField.this, IFormFieldListener.VALUE_CHANGE,
                        loadedValue == null && date.equals(nullValue) ? null : date);
            }

        });
        // focus listener
        datetime.addFocusListener(new FocusListener() {
            public void focusLost(FocusEvent event) {
                //                datetime.setBackground( FormEditorToolkit.textBackground );
                site.fireEvent(DateTimeFormField.this, IFormFieldListener.FOCUS_LOST, null);
            }

            public void focusGained(FocusEvent event) {
                //                datetime.setBackground( FormEditorToolkit.textBackgroundFocused );
                site.fireEvent(DateTimeFormField.this, IFormFieldListener.FOCUS_GAINED, null);
            }
        });
        return datetime;
    }

    public IFormField setEnabled(boolean enabled) {
        this.enabled = enabled;
        if (datetime != null) {
            datetime.setEnabled(enabled);
            //            datetime.setBackground( enabled ? FormEditorToolkit.textBackground : FormEditorToolkit.textBackgroundDisabled );
        }
        return this;
    }

    public IFormField setValue(Object value) {
        Date date = (Date) value;
        Calendar cal = Calendar.getInstance(Locale.GERMANY);
        cal.setTime(date);

        // modify the orig value; otherwise millis may differ as DateTime field
        // does not support millis
        cal.set(Calendar.MILLISECOND, 0);
        date.setTime(cal.getTimeInMillis());

        datetime.setDate(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DATE));
        datetime.setTime(cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE), cal.get(Calendar.SECOND));

        // the above calls does not seem to fire events
        site.fireEvent(DateTimeFormField.this, IFormFieldListener.VALUE_CHANGE,
                loadedValue == null && date.equals(nullValue) ? null : date);
        return this;
    }

    public void load() throws Exception {
        assert datetime != null : "Control is null, call createControl() first.";

        if (site.getFieldValue() == null) {
            loadedValue = null;
            setValue(nullValue);

            //            // from the source of DateTime.setDate()
            //            datetime.setDate( 9996, 0, 1 );
            //            datetime.setTime( 0, 0, 0 );
        } else if (site.getFieldValue() instanceof Date) {
            loadedValue = (Date) site.getFieldValue();
            setValue(loadedValue);
        } else {
            log.warn("Unknown value type: " + site.getFieldValue());
        }
    }

    public void store() throws Exception {
        if (datetime.getYear() != 9996) {
            Calendar cal = Calendar.getInstance(Locale.GERMANY);
            cal.set(datetime.getYear(), datetime.getMonth(), datetime.getDay(), datetime.getHours(),
                    datetime.getMinutes(), datetime.getSeconds());
            site.setFieldValue(cal.getTime());
        }
    }

}