exercise24_13chartcontroller.java

java程序设计导论（daniel liang著） 所有偶数课后习题答案

import javax.swing.table.*;
import java.util.*;
import javax.swing.event.*;
import javax.swing.*;
import java.awt.event.*;

public class Exercise24_13ChartController extends javax.swing.JPanel implements ActionListener {
  // Table selection model
  DefaultListSelectionModel listSelectionModel =
    new DefaultListSelectionModel();

  /** Creates new form Exercise24_13ChartController */
  public Exercise24_13ChartController() {
    initComponents();

    listSelectionModel.addListSelectionListener(
      new javax.swing.event.ListSelectionListener() {
      public void valueChanged(ListSelectionEvent e) {
        listSelectionModel_valueChanged(e);
      }
    });
  }

  /** This method is called from within the constructor to
   * initialize the form.
   * WARNING: Do NOT modify this code. The content of this method is
   * always regenerated by the Form Editor.
   */
  private void initComponents() {//GEN-BEGIN:initComponents
    tableModel = new MyTableModel();
    jPanel1 = new javax.swing.JPanel();
    jbtInsert = new javax.swing.JButton();
    jbtDelete = new javax.swing.JButton();
    jbtUpdate = new javax.swing.JButton();
    jScrollPane1 = new javax.swing.JScrollPane();
    jTable1 = new javax.swing.JTable();

    setLayout(new java.awt.BorderLayout());

    jbtInsert.setText("Insert");
    jbtInsert.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(java.awt.event.ActionEvent evt) {
        jbtInsertActionPerformed(evt);
      }
    });

    jPanel1.add(jbtInsert);

    jbtDelete.setText("Delete");
    jbtDelete.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(java.awt.event.ActionEvent evt) {
        jbtDeleteActionPerformed(evt);
      }
    });

    jPanel1.add(jbtDelete);

    jbtUpdate.setText("Update");
    jbtUpdate.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(java.awt.event.ActionEvent evt) {
        jbtUpdateActionPerformed(evt);
      }
    });

    jPanel1.add(jbtUpdate);

    add(jPanel1, java.awt.BorderLayout.NORTH);

    jTable1.setModel(new javax.swing.table.DefaultTableModel(
      new Object [][] {

      },
      new String [] {

      }
    ));
    jTable1.setModel(tableModel);
    jTable1.setSelectionModel(listSelectionModel);
    jScrollPane1.setViewportView(jTable1);

    add(jScrollPane1, java.awt.BorderLayout.CENTER);

  }//GEN-END:initComponents

  private void jbtUpdateActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jbtUpdateActionPerformed
    try {
      // Get the current row
      this.tableModelToChartModel();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }//GEN-LAST:event_jbtUpdateActionPerformed

  private void jbtDeleteActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jbtDeleteActionPerformed
    deleteRow();
  }//GEN-LAST:event_jbtDeleteActionPerformed

  private void tableModelToChartModel() {
    // Notify the change to the chart model
    int rowCount = tableModel.getRowCount();
    String[] dataName = new String[rowCount];
    double[] data = new double[rowCount];
    for (int i=0; i<rowCount; i++) {
      dataName[i] = (String)(tableModel.getValueAt(i, 0));
      data[i] = ((Double)(tableModel.getValueAt(i, 1))).doubleValue();
    }

    this.getChartModel().setChartData(dataName, data);
  }

  private void deleteRow() {
   // Remove the row in the table
    tableModel.removeRow(
      listSelectionModel.getLeadSelectionIndex());

    // Notify the change to the circle model
    int rowCount = tableModel.getRowCount();

    tableModelToChartModel();
  }

  /**Handle the selection in the table*/
  void listSelectionModel_valueChanged(ListSelectionEvent e) {
    int selectedRow = jTable1.getSelectedRow();
  }

  public void setChartModel(Exercise21_6ChartModel newChartModel) {
    chartModel = newChartModel;
    chartModelToTableModel();
    chartModel.addActionListener(this);
  }

  private void chartModelToTableModel() {
    String[] dataName = chartModel.getDataName();
    double[] data = chartModel.getData();

    Object[][] rows = new Object[dataName.length][2];

    for (int i=0; i<dataName.length; i++) {
      rows[i][0] = dataName[i];
      rows[i][1] = new Double(data[i]);
    }

    Object[] columnHeader = {"DataName", "Data"};
    tableModel.setDataVector(rows, columnHeader);
  }

  public Exercise21_6ChartModel getChartModel() {
    return chartModel;
  }

  private void jbtInsertActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jbtInsertActionPerformed
    tableModel.insertRow(listSelectionModel.getLeadSelectionIndex(),
      new Object[] {"", new Double(0)});
  }//GEN-LAST:event_jbtInsertActionPerformed

  public void actionPerformed(ActionEvent e) {
    /**@todo: Implement this java.awt.event.ActionListener method*/
    chartModelToTableModel();
    repaint();
  }

  // Variables declaration - do not modify//GEN-BEGIN:variables
  private MyTableModel tableModel;
  private javax.swing.JPanel jPanel1;
  private javax.swing.JScrollPane jScrollPane1;
  private javax.swing.JTable jTable1;
  private javax.swing.JButton jbtUpdate;
  private javax.swing.JButton jbtInsert;
  private javax.swing.JButton jbtDelete;
  // End of variables declaration//GEN-END:variables

  /** Holds value of property chartModel. */
  private Exercise21_6ChartModel chartModel;
}