Source Code : Editable Header Table Example

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Editable Header Table Example

 

// Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html

import java.awt.Component;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.EventObject;

import javax.swing.DefaultCellEditor;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.event.CellEditorListener;
import javax.swing.event.ChangeEvent;
import javax.swing.event.MouseInputListener;
import javax.swing.plaf.basic.BasicTableHeaderUI;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

/**
 * @version 1.0 08/22/99
 */
public class EditableHeaderTableExample extends JFrame {

  public EditableHeaderTableExample() {
    super("EditableHeader Example");

    JTable table = new JTable(7, 5);
    TableColumnModel columnModel = table.getColumnModel();
    table.setTableHeader(new EditableHeader(columnModel));

    JScrollPane pane = new JScrollPane(table);
    getContentPane().add(pane);
  }

  public static void main(String[] args) {
    EditableHeaderTableExample frame = new EditableHeaderTableExample();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    frame.setSize(300, 100);
    frame.setVisible(true);
  }
}

class EditableHeader extends JTableHeader implements CellEditorListener {
  public final int HEADER_ROW = -10;

  transient protected int editingColumn;

  transient protected TableCellEditor cellEditor;

  transient protected Component editorComp;

  public EditableHeader(TableColumnModel columnModel) {
    super(columnModel);
    setReorderingAllowed(false);
    cellEditor = null;
    recreateTableColumn(columnModel);
  }

  public void updateUI() {
    setUI(new EditableHeaderUI());
    resizeAndRepaint();
    invalidate();
  }

  protected void recreateTableColumn(TableColumnModel columnModel) {
    int n = columnModel.getColumnCount();
    EditableHeaderTableColumn[] newCols = new EditableHeaderTableColumn[n];
    TableColumn[] oldCols = new TableColumn[n];
    for (int i = 0; i < n; i++) {
      oldCols[i] = columnModel.getColumn(i);
      newCols[i] = new EditableHeaderTableColumn();
      newCols[i].copyValues(oldCols[i]);
    }
    for (int i = 0; i < n; i++) {
      columnModel.removeColumn(oldCols[i]);
    }
    for (int i = 0; i < n; i++) {
      columnModel.addColumn(newCols[i]);
    }
  }

  public boolean editCellAt(int index) {
    return editCellAt(index);
  }

  public boolean editCellAt(int index, EventObject e) {
    if (cellEditor != null && !cellEditor.stopCellEditing()) {
      return false;
    }
    if (!isCellEditable(index)) {
      return false;
    }
    TableCellEditor editor = getCellEditor(index);

    if (editor != null && editor.isCellEditable(e)) {
      editorComp = prepareEditor(editor, index);
      editorComp.setBounds(getHeaderRect(index));
      add(editorComp);
      editorComp.validate();
      setCellEditor(editor);
      setEditingColumn(index);
      editor.addCellEditorListener(this);

      return true;
    }
    return false;
  }

  public boolean isCellEditable(int index) {
    if (getReorderingAllowed()) {
      return false;
    }
    int columnIndex = columnModel.getColumn(index).getModelIndex();
    EditableHeaderTableColumn col = (EditableHeaderTableColumn) columnModel
        .getColumn(columnIndex);
    return col.isHeaderEditable();
  }

  public TableCellEditor getCellEditor(int index) {
    int columnIndex = columnModel.getColumn(index).getModelIndex();
    EditableHeaderTableColumn col = (EditableHeaderTableColumn) columnModel
        .getColumn(columnIndex);
    return col.getHeaderEditor();
  }

  public void setCellEditor(TableCellEditor newEditor) {
    TableCellEditor oldEditor = cellEditor;
    cellEditor = newEditor;

    // firePropertyChange

    if (oldEditor != null && oldEditor instanceof TableCellEditor) {
      ((TableCellEditor) oldEditor)
          .removeCellEditorListener((CellEditorListener) this);
    }
    if (newEditor != null && newEditor instanceof TableCellEditor) {
      ((TableCellEditor) newEditor)
          .addCellEditorListener((CellEditorListener) this);
    }
  }

  public Component prepareEditor(TableCellEditor editor, int index) {
    Object value = columnModel.getColumn(index).getHeaderValue();
    boolean isSelected = true;
    int row = HEADER_ROW;
    JTable table = getTable();
    Component comp = editor.getTableCellEditorComponent(table, value,
        isSelected, row, index);
    if (comp instanceof JComponent) {
      ((JComponent) comp).setNextFocusableComponent(this);
    }
    return comp;
  }

  public TableCellEditor getCellEditor() {
    return cellEditor;
  }

  public Component getEditorComponent() {
    return editorComp;
  }

  public void setEditingColumn(int aColumn) {
    editingColumn = aColumn;
  }

  public int getEditingColumn() {
    return editingColumn;
  }

  public void removeEditor() {
    TableCellEditor editor = getCellEditor();
    if (editor != null) {
      editor.removeCellEditorListener(this);

      requestFocus();
      remove(editorComp);

      int index = getEditingColumn();
      Rectangle cellRect = getHeaderRect(index);

      setCellEditor(null);
      setEditingColumn(-1);
      editorComp = null;

      repaint(cellRect);
    }
  }

  public boolean isEditing() {
    return (cellEditor == null) ? false : true;
  }

  //
  // CellEditorListener
  //
  public void editingStopped(ChangeEvent e) {
    TableCellEditor editor = getCellEditor();
    if (editor != null) {
      Object value = editor.getCellEditorValue();
      int index = getEditingColumn();
      columnModel.getColumn(index).setHeaderValue(value);
      removeEditor();
    }
  }

  public void editingCanceled(ChangeEvent e) {
    removeEditor();
  }

  //
  // public void setReorderingAllowed(boolean b) {
  //   reorderingAllowed = false;
  // }

}

class EditableHeaderUI extends BasicTableHeaderUI {

  protected MouseInputListener createMouseInputListener() {
    return new MouseInputHandler((EditableHeader) header);
  }

  public class MouseInputHandler extends BasicTableHeaderUI.MouseInputHandler {
    private Component dispatchComponent;

    protected EditableHeader header;

    public MouseInputHandler(EditableHeader header) {
      this.header = header;
    }

    private void setDispatchComponent(MouseEvent e) {
      Component editorComponent = header.getEditorComponent();
      Point p = e.getPoint();
      Point p2 = SwingUtilities.convertPoint(header, p, editorComponent);
      dispatchComponent = SwingUtilities.getDeepestComponentAt(
          editorComponent, p2.x, p2.y);
    }

    private boolean repostEvent(MouseEvent e) {
      if (dispatchComponent == null) {
        return false;
      }
      MouseEvent e2 = SwingUtilities.convertMouseEvent(header, e,
          dispatchComponent);
      dispatchComponent.dispatchEvent(e2);
      return true;
    }

    public void mousePressed(MouseEvent e) {
      if (!SwingUtilities.isLeftMouseButton(e)) {
        return;
      }
      super.mousePressed(e);

      if (header.getResizingColumn() == null) {
        Point p = e.getPoint();
        TableColumnModel columnModel = header.getColumnModel();
        int index = columnModel.getColumnIndexAtX(p.x);
        if (index != -1) {
          if (header.editCellAt(index, e)) {
            setDispatchComponent(e);
            repostEvent(e);
          }
        }
      }
    }

    public void mouseReleased(MouseEvent e) {
      super.mouseReleased(e);
      if (!SwingUtilities.isLeftMouseButton(e)) {
        return;
      }
      repostEvent(e);
      dispatchComponent = null;
    }

  }

}

class EditableHeaderTableColumn extends TableColumn {

  protected TableCellEditor headerEditor;

  protected boolean isHeaderEditable;

  public EditableHeaderTableColumn() {
    setHeaderEditor(createDefaultHeaderEditor());
    isHeaderEditable = true;
  }

  public void setHeaderEditor(TableCellEditor headerEditor) {
    this.headerEditor = headerEditor;
  }

  public TableCellEditor getHeaderEditor() {
    return headerEditor;
  }

  public void setHeaderEditable(boolean isEditable) {
    isHeaderEditable = isEditable;
  }

  public boolean isHeaderEditable() {
    return isHeaderEditable;
  }

  public void copyValues(TableColumn base) {
    modelIndex = base.getModelIndex();
    identifier = base.getIdentifier();
    width = base.getWidth();
    minWidth = base.getMinWidth();
    setPreferredWidth(base.getPreferredWidth());
    maxWidth = base.getMaxWidth();
    headerRenderer = base.getHeaderRenderer();
    headerValue = base.getHeaderValue();
    cellRenderer = base.getCellRenderer();
    cellEditor = base.getCellEditor();
    isResizable = base.getResizable();
  }

  protected TableCellEditor createDefaultHeaderEditor() {
    return new DefaultCellEditor(new JTextField());
  }

}

           
         
  

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