borrowdialog.java

本人写的一个简单VCD租赁系统

//************************************************
//BorrowDialog.java
//This class is used to create an GUI dialog for
//borrowing videos from the stock.
//Created by Xiaobin Lin               3/Dec/2004
//************************************************

package Main;

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import javax.swing.WindowConstants.*;
import java.awt.event.*;


public class BorrowDialog extends JDialog {
    
    //Constructor: automatically invoked when a new instance of BorrowDialog is created
    public BorrowDialog(Frame parent, boolean modal, MemberSet mSet, VideoSet vSet, LendingSet lSet) {
        super(parent, modal);
        memberSet = mSet;
        videoSet = vSet;
        lendingSet = lSet;
        tableHandlerMember = new TableHandler(memberSet);
        tableHandlerVideo = new TableHandler(videoSet);
        step = 1;
        rowSelected = -1;
        initComponents();
        setComponents();
    }
        
    // This method is called from within the constructor to
    // initialize the GUI for the borrow-video dialog.
    private void initComponents() {
        scrollPaneBorrow = new JScrollPane();
        tableBorrow = new JTable();
        buttonBack = new JButton();
        buttonNext = new JButton();
        buttonBorrow = new JButton();
        buttonCancel = new JButton();
        panelMessage = new JPanel();
        textAreaStep1 = new JTextArea();
        textAreaStep2 = new JTextArea();
        labelSteps = new JLabel();
        labelHints = new JLabel();
        textAreaHints = new JTextArea();
        labelTableName = new JLabel();

        getContentPane().setLayout(null);

        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setTitle("Borrow a Video");
        setModal(true);
        setName("dialogBorrow");
        setResizable(false);
        scrollPaneBorrow.setFont(new Font("Times New Roman", 0, 12));
        tableBorrow.setFont(new Font("Times New Roman", 0, 12));
        tableBorrow.setModel(tableHandlerMember);
        tableBorrow.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        ListSelectionModel rowSM = tableBorrow.getSelectionModel();
        rowSM.addListSelectionListener(new ListSelectionListener() {
            public void valueChanged(ListSelectionEvent e) {
                //Ignore extra messages.
                if (e.getValueIsAdjusting()) return;

                ListSelectionModel lsm = (ListSelectionModel)e.getSource();
                if (lsm.isSelectionEmpty()) {
                    if (step == 1){
                        buttonNext.setEnabled(false);
                    }else if (step == 2){
                        buttonBorrow.setEnabled(false);
                    }
                } else {
                    rowSelected = lsm.getMinSelectionIndex();
                    if (step == 1){
                        memberNo = memberSet.getMemberNo(rowSelected);
                        //check if the member is already in the lendingset database
                        int hasVideo = lendingSet.findMember(memberNo);
                        if (hasVideo == -1){ //the member hasn't borrowed
                            membershipClass = memberSet.getMembershipClass(rowSelected);
                            textAreaHints.setText("");
                            buttonNext.setEnabled(true);
                        }else{
                            textAreaHints.setText("This member has a\n video unreturned.");
                            buttonNext.setEnabled(false);
                        }
                    }else if (step == 2){
                        videoIndex = rowSelected;
                        //check if the video is already in the lendingset database
                        int beBorrowed = lendingSet.findVideo(videoIndex);
                        if (beBorrowed == -1){
                            videoLangClass = videoSet.getVideoLangClass(videoIndex);
                            if (membershipClass >= videoLangClass){//the member is allowed to borrow the video
                                textAreaHints.setText("");
                                buttonBorrow.setEnabled(true);
                            }else{
                                textAreaHints.setText("The member's\n membership-class is not\n enough for borrowing this\n video.");
                                buttonBorrow.setEnabled(false);
                            }
                        }else{
                            textAreaHints.setText("This video has already been\n lent out.");
                            buttonBorrow.setEnabled(false);
                        }
                    }
                }
            }
        });
        scrollPaneBorrow.setViewportView(tableBorrow);

        getContentPane().add(scrollPaneBorrow);
        scrollPaneBorrow.setBounds(180, 40, 380, 290);

        buttonBack.setFont(new Font("Times New Roman", 0, 12));
        buttonBack.setText("Back");
        buttonBack.setEnabled(false);
        buttonBack.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                buttonBackActionPerformed(evt);
            }
        });

        getContentPane().add(buttonBack);
        buttonBack.setBounds(200, 350, 80, 23);

        buttonNext.setFont(new Font("Times New Roman", 0, 12));
        buttonNext.setText("Next");
        buttonNext.setEnabled(false);
        buttonNext.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                buttonNextActionPerformed(evt);
            }
        });

        getContentPane().add(buttonNext);
        buttonNext.setBounds(290, 350, 80, 23);

        buttonBorrow.setFont(new Font("Times New Roman", 0, 12));
        buttonBorrow.setText("Borrow");
        buttonBorrow.setEnabled(false);
        buttonBorrow.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                buttonBorrowActionPerformed(evt);
            }
        });

        getContentPane().add(buttonBorrow);
        buttonBorrow.setBounds(380, 350, 80, 23);

        buttonCancel.setFont(new Font("Times New Roman", 0, 12));
        buttonCancel.setText("Cancel");
        buttonCancel.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                buttonCancelActionPerformed(evt);
            }
        });

        getContentPane().add(buttonCancel);
        buttonCancel.setBounds(470, 350, 80, 23);

        panelMessage.setLayout(null);

        panelMessage.setFont(new Font("Times New Roman", 0, 12));
        textAreaStep1.setEditable(false);
        textAreaStep1.setFont(new Font("Times New Roman", 1, 12));
        textAreaStep1.setFocusable(false);
        textAreaStep1.setOpaque(false);
        panelMessage.add(textAreaStep1);
        textAreaStep1.setBounds(10, 50, 160, 60);

        textAreaStep2.setEditable(false);
        textAreaStep2.setFont(new Font("Times New Roman", 0, 12));
        textAreaStep2.setFocusable(false);
        textAreaStep2.setOpaque(false);
        panelMessage.add(textAreaStep2);
        textAreaStep2.setBounds(10, 120, 160, 40);

        labelSteps.setFont(new Font("Times New Roman", 1, 14));
        labelSteps.setText("Steps");
        panelMessage.add(labelSteps);
        labelSteps.setBounds(10, 10, 40, 20);

        labelHints.setFont(new Font("Times New Roman", 1, 14));
        labelHints.setText("Hints");
        panelMessage.add(labelHints);
        labelHints.setBounds(10, 200, 40, 20);

        textAreaHints.setEditable(false);
        textAreaHints.setFont(new Font("Times New Roman", 1, 12));
        textAreaHints.setFocusable(false);
        textAreaHints.setOpaque(false);
        panelMessage.add(textAreaHints);
        textAreaHints.setBounds(10, 240, 160, 80);

        getContentPane().add(panelMessage);
        panelMessage.setBounds(0, 0, 180, 330);

        labelTableName.setFont(new Font("Times New Roman", 1, 14));
        labelTableName.setText("Member Table");
        getContentPane().add(labelTableName);
        labelTableName.setBounds(180, 10, 130, 20);

        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-570)/2, (screenSize.height-420)/2, 570, 420);
    }//the end of initComponents

        
    //this method set the states for components such as enabling a button
    //or disabling a button
    private void setComponents(){
        String textTableNames[] = {"Memble Tables", "Video Tables"};
        String textStep1 = "1. Choose a member from the\n    member table on the\n    right-hand side, then\n    click the Next button.";
        String textStep2[] = {"2. ...", "2. Choose the video you want\n    to borrow, then click the\n    Borrow button."};
        if (step == 1){
            buttonBack.setEnabled(false);
            buttonBorrow.setEnabled(false);
            buttonCancel.setEnabled(true);
                     
            textAreaStep1.setText(textStep1);
            textAreaStep1.setFont(new java.awt.Font("Times New Roman", 1, 12));
            textAreaStep2.setText(textStep2[0]);
            textAreaStep2.setFont(new java.awt.Font("Times New Roman", 0, 12));
        }else if(step == 2){
            buttonBack.setEnabled(true);
            buttonNext.setEnabled(false);
            buttonCancel.setEnabled(true);
            
            labelTableName.setText(textTableNames[1]);
            textAreaStep1.setFont(new java.awt.Font("Times New Roman", 0, 12));
            textAreaStep2.setText(textStep2[1]);
            textAreaStep2.setFont(new java.awt.Font("Times New Roman", 1, 12));
        }
    }
    
    //when borrow button is pressed
    private void buttonBorrowActionPerformed(ActionEvent evt) {
        Lending lending = new Lending(memberNo, videoIndex);
        lendingSet.addNewLending(lending);
        exitDialog();
    }

    //when back button is pressed
    private void buttonBackActionPerformed(ActionEvent evt) {
        step = 1;
        textAreaHints.setText("");
        setComponents();
        tableBorrow.setModel(tableHandlerMember);        
    }

    //when next button is pressed
    private void buttonNextActionPerformed(ActionEvent evt) {
        step = 2;
        setComponents();
        tableBorrow.setModel(tableHandlerVideo);
    }
    
    //when cancel button is pressed
    private void buttonCancelActionPerformed(ActionEvent evt) {
        exitDialog();
    }
    
    private void exitDialog(){
        setVisible(false);
        dispose();        
    }
    
     
    //Variables declaration - GUI-related
    private JButton buttonBack;
    private JButton buttonBorrow;
    private JButton buttonCancel;
    private JButton buttonNext;
    private JLabel labelHints;
    private JLabel labelSteps;
    private JLabel labelTableName;
    private JPanel panelMessage;
    private JScrollPane scrollPaneBorrow;
    private JTable tableBorrow;
    private JTextArea textAreaHints;
    private JTextArea textAreaStep1;
    private JTextArea textAreaStep2;
    //variables declaration - non-GUI-related
    private MemberSet memberSet;
    private VideoSet videoSet;
    private LendingSet lendingSet;
    private TableHandler tableHandlerMember;
    private TableHandler tableHandlerVideo;
    private int step;
    private int rowSelected;
    private int memberNo;
    private int membershipClass;
    private int videoIndex;
    private int videoLangClass;
}