ColumnWidthPropertyEditorWidget.java

/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2002-2013 Pentaho Corporation..  All rights reserved.
*/

package org.pentaho.pms.ui.concept.editor;

import java.math.BigDecimal;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Text;
import org.pentaho.pms.schema.concept.types.columnwidth.ColumnWidth;

public class ColumnWidthPropertyEditorWidget extends AbstractPropertyEditorWidget implements FocusListener,
    ISelectionChangedListener {

  // ~ Static fields/initializers ======================================================================================

  private static final Log logger = LogFactory.getLog(ColumnWidthPropertyEditorWidget.class);

  // ~ Instance fields =================================================================================================

  private ComboViewer typeComboViewer;

  private Text width;

  Label typeLabel;

  Combo type;

  Label widthLabel;

  // ~ Constructors ====================================================================================================

  public ColumnWidthPropertyEditorWidget(final Composite parent, final int style, final IConceptModel conceptModel,
      final String propertyId, final Map context) {
    super(parent, style, conceptModel, propertyId, context);
    refresh();
  }

  // ~ Methods =========================================================================================================

  protected void createContents(final Composite parent) {
    addDisposeListener(new DisposeListener() {
      public void widgetDisposed(DisposeEvent e) {
        ColumnWidthPropertyEditorWidget.this.widgetDisposed(e);
      }
    });
    typeLabel = new Label(parent, SWT.NONE);
    typeLabel.setText("Column Width Type:"); //$NON-NLS-1$

    type = new Combo(parent, SWT.READ_ONLY | SWT.BORDER);

    typeComboViewer = new ComboViewer(type);

    typeComboViewer.setContentProvider(new IStructuredContentProvider() {
      public Object[] getElements(final Object inputElement) {
        return (ColumnWidth[]) inputElement;
      }

      public void dispose() {
      }

      public void inputChanged(final Viewer viewer, final Object oldInput, final Object newInput) {
      }
    });

    typeComboViewer.setInput(ColumnWidth.types);

    typeComboViewer.setLabelProvider(new LabelProvider() {
      public Image getImage(final Object element) {
        // no images in this combo
        return null;
      }

      public String getText(final Object element) {
        return ((ColumnWidth) element).getDescription();
      }
    });

    FormData fdType = new FormData();
    fdType.left = new FormAttachment(typeLabel, 10);
    fdType.top = new FormAttachment(0, 0);
    type.setLayoutData(fdType);

    FormData fdTypeLabel = new FormData();
    fdTypeLabel.left = new FormAttachment(0, 0);
    fdTypeLabel.top = new FormAttachment(type, 0, SWT.CENTER);
    typeLabel.setLayoutData(fdTypeLabel);

    widthLabel = new Label(parent, SWT.NONE);
    widthLabel.setText("Column Width:"); //$NON-NLS-1$

    width = new Text(parent, SWT.BORDER | SWT.SINGLE | SWT.LEFT);

    // only allow digits
    width.addListener(SWT.Verify, new Listener() {
      public void handleEvent(final Event e) {
        String string = e.text;
        char[] chars = new char[string.length()];
        string.getChars(0, chars.length, chars, 0);
        for (int i = 0; i < chars.length; i++) {
          if (!(Character.isDigit(chars[i]))) {
            e.doit = false;
            return;
          }
        }
      }
    });

    //    width.setToolTipText(Messages.getString("ConceptPropertyColumnWidthWidget.USER_SELECT_PROPERTY_WIDTH", name)); //$NON-NLS-1$
    FormData fdWidth = new FormData();
    fdWidth.left = new FormAttachment(widthLabel, 10);
    fdWidth.right = new FormAttachment(100, 0);
    fdWidth.top = new FormAttachment(type, 10);
    width.setLayoutData(fdWidth);

    FormData fdWidthLabel = new FormData();
    fdWidthLabel.left = new FormAttachment(0, 0);
    fdWidthLabel.top = new FormAttachment(width, 0, SWT.CENTER);
    widthLabel.setLayoutData(fdWidthLabel);

    typeComboViewer.addSelectionChangedListener(this);
    width.addFocusListener(this);
  }

  protected void widgetDisposed(final DisposeEvent e) {
  }

  public Object getValue() {

    IStructuredSelection selection = (IStructuredSelection) typeComboViewer.getSelection();
    ColumnWidth columnWidth = (ColumnWidth) selection.getFirstElement();
    int widthType = columnWidth.getType();
    BigDecimal widthValue;
    try {
      widthValue = new BigDecimal(width.getText());
    } catch (Exception e) {
      widthValue = new BigDecimal(0);
    }
    return new ColumnWidth(widthType, widthValue);
  }

  protected void setValue(final Object value) {
    if (value instanceof ColumnWidth) {
      ColumnWidth columnWidth = (ColumnWidth) value;
      typeComboViewer.setSelection(new StructuredSelection(ColumnWidth.getType(columnWidth.getCode())));
      if (columnWidth.getWidth() != null) {
        width.setText(columnWidth.getWidth().toString());
      } else {
        width.setText("");
      }
    }
  }

  public String validate() {
    if (isEditable()) {
      try {
        new BigDecimal(width.getText());
      } catch (NumberFormatException e) {
        return String.format("%s is not a valid number.", PredefinedVsCustomPropertyHelper
            .getDescription(getPropertyId()));
      }
    }
    return null;
  }

  public void refresh() {
    refreshOverrideButton();
    typeComboViewer.removeSelectionChangedListener(this);
    width.setEnabled(isEditable());
    widthLabel.setEnabled(isEditable());
    typeLabel.setEnabled(isEditable());
    type.setEnabled(isEditable());
    setValue(getProperty().getValue());
    typeComboViewer.addSelectionChangedListener(this);
  }

  public void focusGained(FocusEvent arg0) {
    // TODO Auto-generated method stub

  }

  public void focusLost(FocusEvent arg0) {
    if (!getValue().equals(getProperty().getValue())) {
      putPropertyValue();
    }
  }

  public void selectionChanged(SelectionChangedEvent arg0) {
    putPropertyValue();
  }

  public void cleanup() {
    typeComboViewer.removeSelectionChangedListener(this);
    width.removeFocusListener(this);
  }

}