100分：我怎么能做出Eclipse中这个控件的效果？

[allenchue]

我现在想要做一个GUI组件，要求是这样的：
它能构显示文字和图标，而且文字如果过长，会用省略号代替多余文字。它可以被选中，也就是类似JTable中单元格的效果，但要能显示图片，并且只能在水平方向上拉伸，而不能在数值方向上。

我发现在eclipse中build和update等过程中显示的对话框中有一个组件同我的要求很像，熟悉SWT的朋友谁知道这是用的什么widget吗？或者使用Swing能做出这样的效果吗？图见：http://freehost21.websamba.com/utarget/Eclipse_snap.jpg

谢谢。

[windpop]

直接看 Eclipse的源码呀。。。 org.eclipse.pde.ui 等里面有很多实例。

[allenchue]

我看了org.eclipse.update.ui包里的一些源码，头都大了，所以来问问的啊。我再去看看pde吧

恳请有人解答，多谢。一定要看看那张截图

[gtlang78]

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

import javax.swing.*;

public class ProgressList
{
private static class Progress {
String title;
String processInfo;
int progress;

public Progress(String title, int progress, String info)
{
processInfo = info;
this.progress = progress;
this.title = title;
}

public String getProcessInfo()
{
return processInfo;
}
public void setProcessInfo(String processInfo)
{
this.processInfo = processInfo;
}
public int getProgress()
{
return progress;
}
public void setProgress(int progress)
{
this.progress = progress;
}
public String getTitle()
{
return title;
}
public void setTitle(String title)
{
this.title = title;
}
}

private static class ProgressListCellRenderer extends JPanel
implements ListCellRenderer {

private JLabel titleIconLabel = new JLabel();
private JLabel titleLabel = new JLabel();
private JLabel progressInfoLabel = new JLabel();
private JLabel stopLabel = new JLabel();
private JProgressBar progressBar = new JProgressBar();
private Color unfocusedSelBackground = new Color(245, 245, 245);

private ProgressListCellRenderer() {
super(new BorderLayout(5, 0));

titleIconLabel.setIcon(new ImageIcon(ProgressList.class.getResource("imgs/titleIcon.png"))); //16x16 icon
stopLabel.setIcon(new ImageIcon(ProgressList.class.getResource("imgs/stopIcon.png"))); //16x16 icon

JPanel centerPane = new JPanel(new BorderLayout(0, 2));
centerPane.setOpaque(false);

centerPane.add(titleLabel, BorderLayout.NORTH);
centerPane.add(progressBar, BorderLayout.CENTER);
centerPane.add(progressInfoLabel, BorderLayout.SOUTH);
this.add(titleIconLabel, BorderLayout.WEST);
this.add(centerPane, BorderLayout.CENTER);
this.add(stopLabel, BorderLayout.EAST);

titleLabel.setFont(titleLabel.getFont().deriveFont(Font.BOLD));
titleIconLabel.setVerticalAlignment(JLabel.TOP);

this.setOpaque(true);
this.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 5));
}

public Component getListCellRendererComponent(
JList list, Object value, int index, boolean isSelected, boolean cellHasFocus)
{
Progress progress = (Progress) value;
progressBar.setValue(progress.getProgress());
titleLabel.setText(progress.getTitle());
progressInfoLabel.setText(progress.getProcessInfo());
this.revalidate();

if (isSelected) {
setBackground(list.getSelectionBackground());
titleLabel.setForeground(list.getSelectionForeground());
progressInfoLabel.setForeground(list.getSelectionForeground());
}
else {
setBackground(unfocusedSelBackground);
titleLabel.setForeground(list.getForeground());
progressInfoLabel.setForeground(list.getForeground());
}

return this;
}

protected void paintComponent(Graphics g)
{
((Graphics2D)g).setRenderingHint(
RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
super.paintComponent(g);
}
}

private static int n = 0;

public static void main(String[] args)
{
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}

final Random random = new Random();
final SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
final DefaultListModel model = new DefaultListModel();
final JList list = new JList(model);
list.setCellRenderer(new ProgressListCellRenderer());
list.setFixedCellWidth(100); /* important */

JButton btn = new JButton("Start");
btn.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
final Progress progress = new Progress("Test Progress - " + (n++), 0, " ");
model.addElement(progress);
new Thread() {
public void run()
{
while (true) {
try {
Thread.sleep(2000 + random.nextInt(200));
} catch (InterruptedException e) {
}
int t = progress.getProgress();
if (t >= 100) {
return;
}

SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
int t = progress.getProgress() + random.nextInt(20);
t = Math.min(t, 100);
progress.setProgress(t);
progress.setProcessInfo("Progress " + t + "% complete, current time is " + sdf.format(new Date()));
int i = model.indexOf(progress);
model.setElementAt(progress, i);

if (t >= 100) {
model.removeElement(progress);
}
}
});
}
}
}.start();
}
});
JPanel btnPane = new JPanel();
btnPane.add(btn);

JScrollPane sp = new JScrollPane(list);
JFrame f = new JFrame("Progress List Test");
f.getContentPane().add(sp, BorderLayout.CENTER);
f.getContentPane().add(btnPane, BorderLayout.SOUTH);
f.setSize(400, 400);
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}

[gtlang78]

用列表绘制器的方法实现按钮事件的相应比较麻烦，我用直接加入组件的方式重写了一遍

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

import javax.swing.*;

public class ProgressList extends JPanel implements Scrollable
{
public ProgressList()
{
super(null);
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
setBackground(Color.WHITE);
}

public Dimension getPreferredScrollableViewportSize()
{
return getPreferredSize();
}

public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction)
{
if (getComponentCount() > 0) {
Component c = getComponent(0);
return c.getHeight();
}
return 0;
}

public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction)
{
return orientation == SwingConstants.HORIZONTAL ? visibleRect.width : visibleRect.height;
}

public boolean getScrollableTracksViewportWidth()
{
return true;
}

public boolean getScrollableTracksViewportHeight()
{
return true;
}

private static class Progress extends JPanel {

private static final ImageIcon CANCEL_BTN_ICON = new ImageIcon(ProgressList.class.getResource("imgs/cancelIcon.png"));
private static final ImageIcon TITLE_ICON = new ImageIcon(ProgressList.class.getResource("imgs/titleIcon.png"));

private static final Color SELECTION_BG = UIManager.getColor("List.selectionBackground");
private static final Color SELECTION_FG = UIManager.getColor("List.selectionForeground");
private static final Color UNSELECTION_BG = new Color(245, 245, 245);
private static final Color UNSELECTION_FG = UIManager.getColor("List.foreground");


private JLabel titleIconLabel = new JLabel();
private JLabel titleLabel = new JLabel();
private JLabel progressInfoLabel = new JLabel();
private JButton cancelBtn = new JButton();
private JProgressBar progressBar = new JProgressBar();
private boolean selected;

private Progress(String title, int progress, String processInfo) {
super(new BorderLayout(5, 0));

titleLabel.setText(title);
progressBar.setValue(progress);
progressInfoLabel.setText(processInfo);

titleIconLabel.setIcon(TITLE_ICON);
cancelBtn.setIcon(CANCEL_BTN_ICON);

JToolBar cancelBtnPane = new JToolBar();
cancelBtnPane.setOpaque(false);
cancelBtnPane.setFloatable(false);
cancelBtnPane.setRollover(true);
cancelBtnPane.setLayout(new BoxLayout(cancelBtnPane, BoxLayout.X_AXIS));
cancelBtnPane.setBorder(null);
cancelBtnPane.add(cancelBtn);

cancelBtn.setContentAreaFilled(false);
cancelBtn.setEnabled(isCancelable());
cancelBtn.setMargin(new Insets(0,0,0,0));
cancelBtn.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
cancel();
}
});

JPanel centerPane = new JPanel(new BorderLayout(0, 2));
centerPane.setOpaque(false);

centerPane.add(titleLabel, BorderLayout.NORTH);
centerPane.add(progressBar, BorderLayout.CENTER);
centerPane.add(progressInfoLabel, BorderLayout.SOUTH);
this.add(titleIconLabel, BorderLayout.WEST);
this.add(centerPane, BorderLayout.CENTER);
this.add(cancelBtnPane, BorderLayout.EAST);

titleLabel.setFont(titleLabel.getFont().deriveFont(Font.BOLD));
titleIconLabel.setVerticalAlignment(JLabel.TOP);

this.setOpaque(true);
this.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 5));

this.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
setSelected(!isSelected());
}
});

setSelected(false);
}

public Dimension getMaximumSize()
{
Dimension d = getPreferredSize();
d.width = Integer.MAX_VALUE;

return d;
}

public void setSelected(boolean b)
{
this.selected = b;
if (b) {
setBackground(SELECTION_BG);
titleLabel.setForeground(SELECTION_FG);
progressInfoLabel.setForeground(SELECTION_FG);
}
else {
setBackground(UNSELECTION_BG);
titleLabel.setForeground(UNSELECTION_FG);
progressInfoLabel.setForeground(UNSELECTION_FG);
}
}

public boolean isSelected()
{
return selected;
}

protected void paintComponent(Graphics g)
{
((Graphics2D)g).setRenderingHint(
RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
GradientPaint gp = new GradientPaint(0, 0, getBackground().brighter(), 0, getHeight(), getBackground());

Graphics2D g2d = (Graphics2D) g;
g2d.setPaint(gp);
g2d.fillRect(0, 0, getWidth(), getHeight());
}

private void removeFromProgressList()
{
Container parent = getParent();
if (parent != null) {
parent.remove(this);
parent.validate();
parent.repaint();
}
}

public int getProgress()
{
return progressBar.getValue();
}

public void setProgress(final int progress)
{
if (SwingUtilities.isEventDispatchThread()) {
progressBar.setValue(progress);
if (progress >= 100) {
completed();
}
}
else {
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
progressBar.setValue(progress);
if (progress >= 100) {
completed();
}
}
});
}
}

public String getProgressInfo()
{
return progressInfoLabel.getText();
}

public void setProcessInfo(final String progressInfo)
{
if (SwingUtilities.isEventDispatchThread()) {
progressInfoLabel.setText(progressInfo);
}
else {
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
progressInfoLabel.setText(progressInfo);
}
});
}
}

protected boolean isCancelable()
{
return true;
}

protected void cancel()
{
removeFromProgressList();
}

protected void completed()
{
removeFromProgressList();
}
}

private static int n = 0;

public static void main(String[] args)
{
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
// UIManager.setLookAndFeel(new PlasticXPLookAndFeel());
} catch (Exception e) {
e.printStackTrace();
}

final Random random = new Random();
final SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
final ProgressList progressList = new ProgressList();

JButton btn = new JButton("Start");
btn.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
final Progress progress = new Progress("Test Progress - " + (n++), 0, " ");
progressList.add(progress);
progressList.revalidate();
progressList.getParent().repaint();

new Thread() {
public void run()
{
while (true) {
try {
Thread.sleep(2000 + random.nextInt(200));
} catch (InterruptedException e) {
}
int t = progress.getProgress();
if (t >= 100) {
return;
}

t += random.nextInt(20);
t = Math.min(t, 100);
progress.setProgress(t);
progress.setProcessInfo("Progress " + t + "% complete, current time is " + sdf.format(new Date()));
}
}
}.start();
}
});
JPanel btnPane = new JPanel();
btnPane.add(btn);

JScrollPane sp = new JScrollPane(progressList);
JFrame f = new JFrame("Progress List Test");
f.getContentPane().add(sp, BorderLayout.CENTER);
f.getContentPane().add(btnPane, BorderLayout.SOUTH);
f.setSize(400, 400);
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}

[allenchue]

万分万分感谢gtlang78！强人啊！这正是我想要的效果。
不过有一个问题：我若将ListCellRenderer中的stopLabel修改为JButton（使其带有停止功能），按钮是不能响应的，似乎它仅仅是paint了上去而并不带有按钮的功能。所有怎样才能使停止按钮能响应事件呢？

谢谢！

[allenchue]

感谢gtlang78，你的代码是可行的。
我修改了一下，去掉了List的背景色渐变处理，并使其仅能单一选取。

再次感谢。