com.ibm.as400.vaccess.DBCellSelector Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jt400 Show documentation
The Open Source version of the IBM Toolbox for Java
The newest version!
///////////////////////////////////////////////////////////////////////////////
//                                                                             
// JTOpen (IBM Toolbox for Java - OSS version)                              
//                                                                             
// Filename: DBCellSelector.java
//                                                                             
// The source code contained herein is licensed under the IBM Public License   
// Version 1.0, which has been approved by the Open Source Initiative.         
// Copyright (C) 1997-2001 International Business Machines Corporation and     
// others. All rights reserved.                                                
//                                                                             
///////////////////////////////////////////////////////////////////////////////

package com.ibm.as400.vaccess;

import javax.swing.DefaultCellEditor;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import java.awt.Color;
import java.awt.Component;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;



/**
 * Used to be able to select cell text in non-updatable SQLResultSetTablePanes.
 * It is not intended to be a typical cell editor. It is only used for selecting cell data, not editing it.
**/
class DBCellSelector extends DefaultCellEditor
{
  private static final String copyright = "Copyright (C) 1997-2001 International Business Machines Corporation and others.";

  static final JTextField textField_ = new JTextField();

  static final JTextArea textArea_ = new JTextArea();
  static final JScrollPane scrollPane_ = new JScrollPane(textArea_);

  static
  {
    textField_.setEditable(true); // So we get a cursor. We add a KeyAdapter that consumes alphabetic characters.
    textArea_.setEditable(true);
    textField_.setBackground(Color.white); // For some reason, the default in JDK 1.3 is gray? or transparent?
    textArea_.setBackground(Color.white);
    textArea_.setLineWrap(false);
    
    KeyAdapter adapter = new KeyAdapter()
    {
      public void keyTyped(KeyEvent e)
      {
        if (e.getModifiers() == 0) // A typical copy/paste key should have modifiers; normal keys won't.
        {
          e.consume(); // Don't let the user type data into the cell.
        }
      }
    };
    
    textField_.addKeyListener(adapter);
    textArea_.addKeyListener(adapter);

    // The text in the cell scrolls automatically, so we don't need a horizontal bar.
    // Plus, the cell isn't big enough to hold both the scrollbar and the text.    
    scrollPane_.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
    // The scroll pane is only used for text areas which are only used for cells with multi-line values.
    // So we always want a vertical scrollbar.
    scrollPane_.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
  
    // Don't want headers or borders, since we are in a cell and don't have extra room for them.
    scrollPane_.setColumnHeader(null);
    scrollPane_.setRowHeader(null);
    scrollPane_.setViewportBorder(null);
  }

  
  /**
   * Calls the DefaultCellEditor constructor with a JTextField.
  **/
  public DBCellSelector()
  {
    super(textField_);
  }

  
  /**
   * Uses the superclass's default cell editor component unless the data value in the cell
   * contains a newline, in which case we use a JTextArea inside a JScrollPane.
  **/  
  public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column)
  {
    // If the text is only one line, then use the regular JTextField;
    // otherwise, use a JTextArea wrapped in a vertically scrollable JScrollPane.
    if (value == null) value = ""; // Swing doesn't like it if the value is null.
    Component c = super.getTableCellEditorComponent(table, value, isSelected, row, column);
    String s = value.toString();
    if (s.indexOf("\n") > -1)
    {
      textArea_.setText(s);
      c = scrollPane_;
    }
    return c;
  }
}