每个ItemView类都会创建自己的项目类实例。 我想放置几个ItemView小部件，每个小部件用于Jpanel上的每个项目 要显示它们，我希望它们可以单击。
将其放在Main类中的configureUi方法上
this is what I get with the next code： 为什么小部件会这样显示而不是在第二张图片上显示
JPanel board = new JPanel();
DefaultListModel<ItemView> listModel = new DefaultListModel<>();
listModel.addElement(itemView);
listModel.addElement(itemView1);
//create the Jlist
JList<ItemView> itemsList = new JList<>(listModel);
board.add(itemsList);
我得到这个take a look和下一个代码 那就是我想要的样子，但是问题是那是不可点击的，我需要它是可点击的。
JPanel board = new JPanel();
Vector<ItemView> list = new Vector<>();
list.add(itemView);
list.add(itemView);
list.add(itemView1);
JList<ItemView> itemsList = new JList<>(list);
ListModel<ItemView> model = itemsList.getModel();
for (int i =0; i < itemsList.getModel().getSize(); i++){
ItemView itemView = itemsList.getModel().getElementAt(i);
board.add(itemView);
}
仅通过成为JList中的元素就不应单击吗？ 如何使其显示可单击的itemView小部件？
ITEMVIEW CLASS
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.font.TextAttribute;
import java.io.IOException;
import java.net.URL;
import java.text.AttributedString;
/** A special panel to display the detail of an item. */
@SuppressWarnings("serial")
public class ItemView extends JPanel{
double originalPrice = 25.00;
Item item = new Item("https://www.amazon.com/Cards-Against-Humanity-LLC-CAHUS/dp/B004S8F7QM/ref=br_asw_pdt-2?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=&pf_rd_r=5AKCTP4FR3Y4DQDMK62F&pf_rd_t=36701&pf_rd_p=da24e60a-b03f-4464-a877-3327db3bc407&pf_rd_i=desktop","Cards Against Humanity", originalPrice);
/** Interface to notify a click on the view page icon. */
public interface ClickListener {
/** Callback to be invoked when the view page icon is clicked. */
void clicked();
}
/** Directory for image files: src/image in Eclipse. */
private final static String IMAGE_DIR = "image/";
/** View-page clicking listener. */
private ClickListener listener;
/** Create a new instance. */
public ItemView() {
setPreferredSize(new Dimension(100, 160));
setBackground(new Color(249, 232, 239));
addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (isViewPageClicked(e.getX(), e.getY()) && listener != null) {
listener.clicked();
}
}
});
}
/** Set the view-page click listener. */
public void setClickListener(ClickListener listener) {
this.listener = listener;
}
/** Overridden here to display the details of the item. */
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Dimension dim = getSize();
//--
//-- WRITE YOUR CODE HERE!
//--
g.setColor(Color.black);
g.setFont(new Font("Dialog", Font.PLAIN, 12));
int x = 20, y = 30;
g.drawImage(getImage("view.png"),x,15, null);
y += 20;
/* this didnt work, the text never jump to the next line...*/
//g.drawString(item.toString(),x,y);
g.drawString("Name: " + item.getName(),x,y);
y += 20;
g.drawString("URL: " + item.getUrl(), x, y);
y += 20;
g.drawString("Price: " + item.getPrice(), x, y);
y += 20;
g.drawString("Change: " + item.getPriceChange()+ "%", x, y);
y += 20;
g.drawString("Added: " + item.getDate() + " ( $ "+ originalPrice +")", x, y);
}
/** Return true if the given screen coordinate is inside the viewPage icon. */
private boolean isViewPageClicked(int x, int y) {
//--
//-- WRITE YOUR CODE HERE
//--
if(x == 20 && y == 30){
return true;
}
else
return new Rectangle(20, 20, 30, 20).contains(x, y);
}
/** Return the image stored in the given file. */
public Image getImage(String file) {
try {
URL url = new URL(getClass().getResource(IMAGE_DIR), file);
return ImageIO.read(url);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
主要课程，我在这里有很多评论，因为我是初学者。
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Vector;
@SuppressWarnings("serial")
public class Main extends JFrame {
/** Default dimension of the dialog. */
private final static Dimension DEFAULT_SIZE = new Dimension(400, 600);
/** Special panel to display the watched item. */
private ItemView itemView;
/** Message bar to display various messages. */
private JLabel msgBar = new JLabel(" ");
/** Create a new dialog. */
public Main() {
this(DEFAULT_SIZE);
}
Item item = new Item();
/** Create a new dialog of the given screen dimension. */
public Main(Dimension dim) {
super("Price Watcher");
setSize(dim);
configureUI();
frameMenu();
makeControlPanel();
setLocationRelativeTo(null);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setVisible(true);
setResizable(true);
showMessage("Welcome!!");
}
/** Callback to be invoked when the refresh button is clicked.
* Find the current price of the watched item and display it
* along with a percentage price change. */
private void refreshButtonClicked(ActionEvent event) {
itemView.item.checkPrice();
repaint();
showMessage("Current Price: " + itemView.item.getPrice());
}
/** Callback to be invoked when the view-page icon is clicked.
* Launch a (default) web browser by supplying the URL of
* the item. */
private void viewPageClicked() {
try{
Desktop.getDesktop().browse(new URL(itemView.item.getUrl()).toURI());
}catch(Exception e){}
showMessage("View clicked!");
}
/** Configure UI. */
/*we create the itemview here, for the set item, but now we have to create more and manage them*/
private void configureUI() {
setLayout(new BorderLayout());
JPanel board = new JPanel();
board.setBackground(Color.white);
board.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createEmptyBorder(10,16,0,16),
BorderFactory.createLineBorder(Color.pink)));
board.setLayout(new GridLayout(3,1));
ItemView itemView1 = new ItemView();
itemView.setClickListener(this::viewPageClicked);
DefaultListModel<ItemView> listModel = new DefaultListModel<>();
listModel.addElement(itemView);
listModel.addElement(itemView1);
//create the list
JList<ItemView> itemsList = new JList<>(listModel);
board.add(itemsList);
add(new JScrollPane(itemsList));
/* Vector<ItemView> list = new Vector<>();
list.add(itemView);
list.add(itemView);
list.add(itemView1);
JList<ItemView> itemsList = new JList<>(list);
ListModel<ItemView> model = itemsList.getModel();
for (int i =0; i < itemsList.getModel().getSize(); i++){
ItemView itemView = itemsList.getModel().getElementAt(i);
board.add(itemView);
}*/
board.add(itemsList);
add(board, BorderLayout.CENTER);
msgBar.setBorder(BorderFactory.createEmptyBorder(10,16,10,0));
add(msgBar, BorderLayout.SOUTH);
}
/** Create a control panel consisting of a refresh button. which is inside the frame, not part of the frame en si*/
private JPanel makeControlPanel() {
JPanel panel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
//JButton allItems = new JButton(getImage("image/screen.png"));
//allItems.setPreferredSize(new Dimension(20,20));
//add.setPreferredSize(new Dimension(10, 10));
//panel.add(allItems);
///JButton refreshButton = new JButton("Refresh");
//refreshButton.setFocusPainted(false);
//refreshButton.addActionListener(this::refreshButtonClicked);
//panel.add(refreshButton);
return panel;
}
/** Show briefly the given string in the message bar. */
private void showMessage(String msg) {
msgBar.setText(msg);
new Thread(() -> {
try {
Thread.sleep(3 * 1000); // 3 seconds
} catch (InterruptedException e) {
}
if (msg.equals(msgBar.getText())) {
SwingUtilities.invokeLater(() -> msgBar.setText(" "));
}
}).start();
}
private void frameMenu(){
JMenuBar menuBar = new JMenuBar();
JMenu appMenu = new JMenu("App");
JMenu itemMenu = new JMenu("Item");
JMenu sortMenu = new JMenu("Sort");
JMenuItem myItem;
//appMenu.getAccessibleContext().setAccessibleDescription("The only menu in this program that has menu items");
myItem = new JMenuItem("About",getImage("image/info.png"));
appMenu.add(myItem);
myItem = new JMenuItem("Exit");
appMenu.add(myItem);
menuBar.add(appMenu);
//
myItem = new JMenuItem("Check prices", getImage("image/check0.png"));
myItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, ActionEvent.ALT_MASK));
itemMenu.add(myItem);
myItem = new JMenuItem("Add item",getImage("image/add.png"));
myItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, ActionEvent.ALT_MASK));
itemMenu.add(myItem);
itemMenu.addSeparator();
myItem = new JMenuItem("Search",getImage("image/search.png"));
myItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, ActionEvent.ALT_MASK));
itemMenu.add(myItem);
myItem = new JMenuItem("Select first",getImage("image/first.png"));
myItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F, ActionEvent.ALT_MASK));
itemMenu.add(myItem);
myItem = new JMenuItem("Select last",getImage("image/last.png"));
myItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_L, ActionEvent.ALT_MASK));
itemMenu.add(myItem);
itemMenu.addSeparator();
// NEW SUBMENU
//a submenu(add a menu to another menu like itemMenu)
JMenu selected = new JMenu("Selected");
myItem = new JMenuItem("Price",getImage("image/check.png"));
myItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P, ActionEvent.ALT_MASK));
selected.add(myItem);
myItem = new JMenuItem("View",getImage("image/link.png"));
myItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, ActionEvent.ALT_MASK));
selected.add(myItem);
myItem = new JMenuItem("Edit",getImage("image/edit.png"));
myItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E, ActionEvent.ALT_MASK));
selected.add(myItem);
myItem = new JMenuItem("Remove",getImage("image/delete.png"));
myItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_R, ActionEvent.ALT_MASK));
selected.add(myItem);
selected.addSeparator();
myItem = new JMenuItem("Copy name");
selected.add(myItem);
myItem = new JMenuItem("Copy url");
selected.add(myItem);
myItem = new JMenuItem("Copy item");
selected.add(myItem);
itemMenu.add(selected);
menuBar.add(itemMenu);
//add items in menu to group so only one can be selected at a time
ButtonGroup group = new ButtonGroup();
JRadioButtonMenuItem myItemR = new JRadioButtonMenuItem("Add oldest");
sortMenu.add(myItemR);
group.add(myItemR);
myItemR = new JRadioButtonMenuItem("Add newest");
sortMenu.add(myItemR);
group.add(myItemR);
sortMenu.addSeparator();
myItemR = new JRadioButtonMenuItem("Name ascending");
sortMenu.add(myItemR);
group.add(myItemR);
myItemR = new JRadioButtonMenuItem("Name descending");
sortMenu.add(myItemR);
group.add(myItemR);
sortMenu.addSeparator();
myItemR = new JRadioButtonMenuItem("Price Change (%)");
sortMenu.add(myItemR);
group.add(myItemR);
myItemR = new JRadioButtonMenuItem("Price low ($)");
sortMenu.add(myItemR);
group.add(myItemR);
myItemR = new JRadioButtonMenuItem("Price high ($)");
sortMenu.add(myItemR);
group.add(myItemR);
menuBar.add(sortMenu);
setJMenuBar(menuBar);
menuBar.add(sortMenu);
setJMenuBar(menuBar);
/*Create a JToolbar to the frame*/
JToolBar toolbar = new JToolBar();
toolbar.setPreferredSize(new Dimension(35, 30));
add(toolbar, BorderLayout.PAGE_START);
JButton refresh = new JButton(getImage("image/refresh.png"));
refresh.setPreferredSize(new Dimension(1,20));
refresh.setToolTipText("Check all prices");
toolbar.add(refresh);
refresh.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
// ----> /*I need to check for all items in the jlist...*/
itemView.item.checkPrice();
repaint();
showMessage("Current Price: " + itemView.item.getPrice()); }
});
JButton add = new JButton(getImage("image/add.png"));
add.setPreferredSize(new Dimension(20,20));
add.setToolTipText("Add an item");
toolbar.add(add);
add.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//JOptionPane.showMessageDialog(frame, "Calendar clicked");
}
});
JButton search = new JButton(getImage("image/search.png"));
search.setPreferredSize(new Dimension(20,20));
search.setToolTipText("Search items");
toolbar.add(search);
search.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//JOptionPane.showMessageDialog(frame, "Calendar clicked");
}
});
JButton selFirst = new JButton(getImage("image/first.png"));
selFirst.setPreferredSize(new Dimension(20,20));
selFirst.setToolTipText("Select first item");
toolbar.add(selFirst);
selFirst.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//JOptionPane.showMessageDialog(frame, "Calendar clicked");
}
});
JButton selectLast = new JButton(getImage("image/last.png"));
selectLast.setPreferredSize(new Dimension(20,20));
selectLast.setToolTipText("Select last item");
toolbar.add(selectLast);
selFirst.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//JOptionPane.showMessageDialog(frame, "Calendar clicked");
}
});
//separator
toolbar.addSeparator();
JButton check = new JButton(getImage("image/check.png"));
check.setPreferredSize(new Dimension(20,20));
check.setToolTipText("Check price of selected item");
toolbar.add(check);
check.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//JOptionPane.showMessageDialog(frame, "Calendar clicked");
}
});
JButton openLink = new JButton(getImage("image/link.png"));
openLink.setPreferredSize(new Dimension(20,20));
openLink.setToolTipText("View web page of selected item");
toolbar.add(openLink);
openLink.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//JOptionPane.showMessageDialog(frame, "Calendar clicked");
}
});
JButton edit = new JButton(getImage("image/edit.png"));
edit.setPreferredSize(new Dimension(20,20));
edit.setToolTipText("Edit selected item");
toolbar.add(edit);
edit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//JOptionPane.showMessageDialog(frame, "Calendar clicked");
}
});
JButton delete = new JButton(getImage("image/delete.png"));
delete.setPreferredSize(new Dimension(20,20));
delete.setToolTipText("Delete selected item");
toolbar.add(delete);
delete.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//JOptionPane.showMessageDialog(frame, "Calendar clicked");
}
});
toolbar.addSeparator();
JButton info = new JButton(getImage("image/info.png"));
info.setPreferredSize(new Dimension(20,20));
toolbar.add(info);
info.setToolTipText("Show app information");
info.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//JOptionPane.showMessageDialog(frame, "Calendar clicked");
}
});
}
public ImageIcon getImage(String file){
try {
return new ImageIcon(ImageIO.read(getClass().getResource(file)));
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public static void main(String[] args) {
new Main();
}
}
/*
* JButton delete = new JButton(getImage("image/add.png"));
delete.setPreferredSize(new Dimension(20,20));
try {
Image img = ImageIO.read(getClass().getResource("image/delete.png"));
delete.setIcon(new ImageIcon(img));
} catch (Exception ex) {
System.out.println(ex);
}
//add.setPreferredSize(new Dimension(10, 10));
toolbar.add(delete);*/
物品类别
package pricewatcher.HW2;
import java.text.DecimalFormat;
import java.util.Date;
public class Item {
private String url;
private String name;
private double price;
private double priceChange;//percentage
private Date date;
priceFinder pf = new priceFinder();
DecimalFormat formatter = new DecimalFormat("#0.00");
public Item(){
date = new Date();
}
/**
* Item constructor
* @param url link to the item
* @param name name of the item
* @param price price of item
* */
public Item(String url, String name, double price) {
this.url = url;
this.name = name;
this.price = price;
this.priceChange = 0.0;
this.date = new Date();
}
public String getUrl() {
return url;
}
public String getName() {
return name;
}
public double getPrice() {//current price
return Double.parseDouble(formatter.format(price));
}
public Date getDate() {
return date;
}
public double getprice() {
return price;
}
public double getPriceChange() {
return Double.parseDouble(formatter.format(priceChange));
}
public void setPrice(double price) {
this.price = price;
}
public void setPriceChange(double priceChange) {
this.priceChange = priceChange;
}
public void setDate(Date date) {
this.date = date;
}
public void setUrl(String url) {
this.url = url;
}
public void setName(String name) {
this.name = name;
}
/**
* checks the price and if there is a change in the price
* it then calculates the price difference
* */
public void checkPrice(){
double tmp = getPrice();//original price
setPrice(pf.simulatedPrice());// change the price
if (tmp != getPrice()){
double newPrice = tmp - getPrice();
double tmp2 = ( tmp + getPrice() ) / 2;
double j = (newPrice / tmp2) * 100;
setPriceChange(j);
}
}
/*
* String representation of the Item object*/
public String toString(){
return
"Name: " + getName() +
"\nUrl: " + getUrl()+
"\nPrice: $" + getPrice()+
"\nChange: " + formatter.format(getPriceChange()) + "%"+
"\nAdded: " + getDate();
}
}
价格查找器类
package pricewatcher.HW2;
import java.util.Random;
public class priceFinder {
public priceFinder(){
}
/**
* simulates a price for the fixed item
* */
public double simulatedPrice(){
Random random = new Random();
double simulatedPrice = random.nextInt(100);
return simulatedPrice;
}
}