[java-list] Dificuldades com JTable

Wed, 31 Oct 2001 12:26:49 -0800

Ola amigos,
 
    faco parte da lista a 1 semana e tenho gostado muito do nivel de discussao que tem aparecido aqui.
    Bom, pra comecar sou novo em programacao JAVA e SWING, mas tenho uma tarefa de desenvolver um programa. Eu utilizo o VAJAVA 3.02, JFC 3.02, e JDK 1.1.8
   
    Minha dificuldade eh que estou tentando trabalhar com um JTable e utilizo um model (MyTableModel) para cria-la mas nao tenho conseguido :
 
         - Adicionar uma linha com novas informacoes.
         - Alterar em tempo de criacao a largura das colunas.
    
    Tenho uma impressao que eu nao estou sabendo trabalhar com o modelo da Tabela. Sera que eh este o meu problema?
    Alguem saberia que codigo eu poderia utilizar para alterar estas informacoes na tabela ou algum codigo de modelo que poderia estar utilizando?
 
    Segue em anexo o codigo do modelo.
 
 
    Desde ja agradeco a atencao de todos...
    Um grande abraco...
    Jader Tenguam...
 
 
 
import java.util.Vector;
public class MyTableModel extends com.sun.java.swing.table.AbstractTableModel {
 final Object[][] data = {  
  {"01", "AMBOS", "Cliente zzz", "29/10/2001","20:30:00","Preview"}
 };
 final String[] columnNames = {
      "Coluna 1",
      "Coluna 2",
      "Coluna 3",
      "Coluna 4",
      "Coluna 5",
      "Coluna 6"};
 protected java.util.Vector dataVector;
 
}
/**
 * Coment�rio do construtor MyTableModel.
 */
public MyTableModel() {
 super();
}
  /**
  *  Add a row to the end of the model.  The new row will contain
  *  <b>null</b> values unless <i>rowData</i> is specified.  Notification
  *  of the row being added will be generated.
  *
  * @param   rowData          optional data of the row being added
  */
 public void addRow(Object[] rowData) {
  addRow(convertToVector(rowData));
 }
 /**
  *  Add a row to the end of the model.  The new row will contain
  *  <b>null</b> values unless <i>rowData</i> is specified.  Notification
  *  of the row being added will be generated.
  *
  * @param   rowData          optional data of the row being added
  */
 public void addRow(Vector rowData) {
  if (rowData == null) {
   rowData = new Vector(getColumnCount());
  }
  else {
   rowData.setSize(getColumnCount());
  }
 
  dataVector.addElement(rowData);
 
  // Generate notification
  newRowsAdded(new com.sun.java.swing.event.TableModelEvent(this, getRowCount()-1, getRowCount()-1,
        com.sun.java.swing.event.TableModelEvent.ALL_COLUMNS, com.sun.java.swing.event.TableModelEvent.INSERT));
 }
//
// Protected Methods
//
 
 /** Returns a Vector that contains the same objects as the array */
 protected static Vector convertToVector(Object[] anArray) {
  if (anArray == null)
   return null;
 
  Vector v = new Vector(anArray.length);
  for (int i=0; i < anArray.length; i++) {
   v.addElement(anArray[i]);
  }
  return v;
 }
 public Class getColumnClass(int c) {
  return getValueAt(0, c).getClass();
 }
 public int getColumnCount() {
  return columnNames.length;
 }
 public String getColumnName(int col) {
  return columnNames[col];
 }
 public int getRowCount() {
  return data.length;
 }
 public Object getValueAt(int row, int col) {
  return data[row][col];
 }
 /*
  * Don't need to implement this method unless your table's
  * editable.
  */
 public boolean isCellEditable(int row, int col) {
  //Note that the data/cell address is constant,
  //no matter where the cell appears onscreen.
  //if (col < 2) {
   return false;
  //} else {
  // return true;
  //}
 }
 /**
  *  This method will make sure the new rows have the correct number of columns.
  *  It does so using the setSize method in Vector which truncates Vectors
  *  which are too long, and appends nulls if they are too short.
  *  This method also sends out a tableChanged() notification message
  *  to all the listeners.
  *
  * @parameter event         This TableModelEvent describes where the
  *                          rows were added.  If <b>null</b> it assumes
  *                          all the rows were newly added.
  * @see #getDataVector()
  */
 public void newRowsAdded(com.sun.java.swing.event.TableModelEvent event) {
  int start = event.getFirstRow();
  int end = event.getLastRow();
  if (start < 0)
    start = 0;
  if (end < 0)
    end = getRowCount()-1;
 
  // Have to make sure all the new columns have the correct
  // number of columns
  for (int i = start; i < end; i++)
   ((Vector)dataVector.elementAt(i)).setSize(getColumnCount());
 
  // Now we send the notification
  fireTableChanged(event);
 }
 /*
  * Don't need to implement this method unless your table's
  * data can change.
  */
 public void setValueAt(Object value, int row, int col) {
  data[row][col] = value;
  fireTableCellUpdated(row, col);
 }
}

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