Swing：将光标更改为等待光标 [英] Swing: Change cursor to wait cursor
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问题描述
另请参阅 Java Swing GUI沙漏。但是，提供的答案似乎不起作用。
See also Java Swing GUI hour glass. However the provided answer does not seem to work.
我有以下代码：
private void loadFileMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
int returnVal = fileChoser.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
try {
this.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
// do stuff
} finally {
this.setCursor(Cursor.getDefaultCursor());
}
}
}
当用户选择时调用菜单栏中的相应条目。但是光标永远不会改变。请注意，加载文件需要一个文件，因此光标的变化应该是可见的。
This is called when user selects the according entry in the menu bar. However the cursor never changes. Note that loading the file takes a file and hence a change in the cursor should be visible.
我做错了什么？
编辑：
此是顶级JFrame。
this is the top level JFrame.
编辑2：将解决方案移至单独的答案
推荐答案
首先制作一个SwingWorker课程：
First make a SwingWorker class:
private class FileLoader extends SwingWorker<String, Void> {
private final JFrame frame;
private final File file;
public SdfLoader(JFrame frame, File file) {
frame.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
this.frame = frame;
this.file = file;
}
@Override
public String doInBackground() throws IOException {
String result = null;
// read file and set result;
return result;
}
@Override
public void done() {
try {
String result = get();
//do stuff
} catch (ExecutionException | InterruptedException ex) {
// display error
JOptionPane.showMessageDialog(SdfViewer.this,
ioException.getMessage(),
"Error opening file",
JOptionPane.ERROR_MESSAGE);
} finally {
frame.setCursor(Cursor.getDefaultCursor());
}
}
}
然后致电它是这样的：
private void loadFileMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
int returnVal = fileChoser.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fileChoser.getSelectedFile();
logger.debug("Opening SD-File '{}'.", file.getAbsoluteFile());
FileLoader loader = new FileLoader(this, file);
loader.execute();
}
}
由@mKorbel编辑，请为此道歉我好hi_jack
EDIT made by @mKorbel, please apologize me for this hi_jack
-
我在这里找不到包含此代码的帖子（某事发生在underlaing数据库），
I can't found my posts with this code here (something happends with underlaing database),
使用此逻辑，
休息在我的在这里发表评论
rest is in my comment here
虚拟-1k错误，错误，错误，你的doInBackground（）缺失
publish（） - process（），已完成（ ）极为错误
设计，读取@trashgod回答的评论，如果可以使用
Runnable #Thread for FileIO，Socket或任何XxxStreams而不是黑色
基于洞关于Future和SwingWorker
virtual -1k wrong, wrong, wrong, your doInBackground() missing publish()-process(), done() is extremly wrong designed, read comments in answer by @trashgod, if is possible to use Runnable#Thread for FileIO, Socket or any XxxStreams instead of black hole based on Future and SwingWorker
- 请根据编辑删除线程中的此代码
。
import java.awt.*;
import java.awt.event.*;
import java.text.SimpleDateFormat;
import java.util.Random;
import javax.swing.*;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.table.*;
public class TableWithTimer implements ActionListener, Runnable {
private static final long serialVersionUID = 1L;
private JFrame frame = new JFrame();
private JScrollPane scroll = new JScrollPane();
private JTable myTable;
private JPanel buttonPanel = new JPanel();
private JButton startButton = new JButton("Start Thread to Update Table");
private JButton stopButton = new JButton("Stop Thread for Update Table");
private JButton newButton = new JButton("Load new Data to Table");
private int count = 0;
private int delay = 3;
private javax.swing.Timer timer = null;
private boolean runProcess;
private int row = 0;
private int column = 0;
private String value = "Amnd";
private int amndValue = 0;
private String valueAt = "";
private SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
private String[] head = {"One", "Two", "Three", "Four", "Five", "Six"};
private String[][] data = new String[25][6];
public TableWithTimer() {
myTable = new TableBackroundPaint0(data, head);
myTable.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
myTable.setRowSelectionAllowed(false);
myTable.setColumnSelectionAllowed(true);
//myTable.setCellSelectionEnabled(true);
myTable.setGridColor(Color.gray);
myTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
final TableCellRenderer cellRendener = myTable.getTableHeader().getDefaultRenderer();
myTable.getTableHeader().setDefaultRenderer(new TableCellRenderer() {
@Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
JLabel label = (JLabel) cellRendener.getTableCellRendererComponent(
table, value, isSelected, hasFocus, row, column);
label.setBackground(Color.orange);
label.setForeground(Color.darkGray);
label.setFont(new Font("SansSerif", Font.BOLD, 12));
label.setBorder(BorderFactory.createCompoundBorder(label.getBorder(),
BorderFactory.createEmptyBorder(0, 5, 0, 0)));
label.setHorizontalAlignment(SwingConstants.LEFT);
label.setHorizontalAlignment(SwingConstants.CENTER);
if ((label.getText().equals("First")) || (label.getText().equals("Second"))) {
label.setForeground(Color.red);
}
if ((label.getText().equals("Day")) || (label.getText().equals("Month")) || (label.getText().equals("Year"))) {
label.setForeground(Color.blue);
}
if ((label.getText().equals("Time"))) {
label.setForeground(Color.green);
}
return label;
}
});
TableColumnModel cm = myTable.getColumnModel();
for (int column1 = 0; column1 < cm.getColumnCount(); column1++) {
TableColumn colLeft1 = cm.getColumn(column1);
cm.getColumn(column1).setWidth(140);
cm.getColumn(column1).setPreferredWidth(140);
}
//myTable.setFillsViewportHeight(true); // apply paintComponent for whole Viewport
JButton cornerButtonTop = new JButton();
cornerButtonTop.setBackground(scroll.getViewport().getBackground());
JButton cornerButtonBottom = new JButton();
cornerButtonBottom.setOpaque(false);
scroll.setCorner(JScrollPane.UPPER_RIGHT_CORNER, cornerButtonTop);
scroll.setCorner(JScrollPane.LOWER_RIGHT_CORNER, cornerButtonBottom);
scroll.setViewportView(myTable);
scroll.setMinimumSize(new Dimension(600, 400));
scroll.setMaximumSize(new Dimension(900, 600));
scroll.setPreferredSize(new Dimension(850, 430));
frame.add(scroll, BorderLayout.CENTER);
buttonPanel.setLayout(new GridLayout(1, 4, 10, 10));
startButton.addActionListener(this);
startButton.setEnabled(false);
stopButton.addActionListener(this);
stopButton.setEnabled(false);
JButton hideButton = new JButton();
newButton.addActionListener(this);
newButton.setEnabled(false);
buttonPanel.add(startButton);
buttonPanel.add(stopButton);
buttonPanel.add(hideButton);
buttonPanel.add(newButton);
hideButton.setVisible(false);
frame.add(buttonPanel, BorderLayout.SOUTH);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocation(100, 100);
frame.pack();
frame.setVisible(true);
start();
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == startButton) {
runProcess = true;
new Thread(this).start();
myTable.requestFocus();
startButton.setEnabled(false);
stopButton.setEnabled(true);
} else if (e.getSource() == stopButton) {
scroll.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
runProcess = false;
startButton.setEnabled(true);
stopButton.setEnabled(false);
newButton.setEnabled(true);
} else if (e.getSource() == newButton) {
runProcess = false;
startButton.setEnabled(true);
stopButton.setEnabled(false);
newButton.setEnabled(false);
addNewData();
}
}
public void addNewData() {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
TableModel model = myTable.getModel();
for (int j = 0; j < model.getRowCount(); j++) {
int column = model.getColumnCount();
for (int i = 0; i < column; i++) {
model.setValueAt("Deleted", j, i);
}
}
startNewData();
}
});
}
private void start() {
scroll.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
timer = new javax.swing.Timer(delay * 100, updateCol());
timer.start();
}
private void startNewData() {
scroll.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
count = 0;
timer = new javax.swing.Timer(1500, updateCol());
timer.start();
}
@Override
public void run() {
scroll.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
count = 0;
Random random = new Random();
while (runProcess) {
row = random.nextInt(myTable.getRowCount());
column = random.nextInt(myTable.getColumnCount());
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
amndValue++;
valueAt = ((myTable.getValueAt(row, column)).toString());
if (!(valueAt.startsWith("A"))) {
count++;
if (count == ((25 * 6))) {
JOptionPane.showMessageDialog(myTable, " Update done ");
scroll.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
runProcess = false;
}
java.util.Date date = new java.util.Date();
String dateTime = sdf.format(date.getTime());
myTable.setValueAt((value + " " + String.valueOf(amndValue) + " at: " + dateTime), row, column);
//myTable.setValueAt(new Integer(1), row, column); // please uncoment for generate misstype error on EDT
myTable.changeSelection(row, column, false, false);
System.out.println("update cycle with value :"
+ (value + " " + String.valueOf(amndValue) + " at: " + dateTime) + ", table row :" + row
+ ", table column " + column);
}
} catch (Exception e) {
runProcess = false;
System.out.println("Error for update JTable cell");
e.printStackTrace();
}
}
});
try {
Thread.sleep(500);
} catch (Exception e) {
e.printStackTrace();
}
}
}
public Action updateCol() {
return new AbstractAction("text load action") {
private static final long serialVersionUID = 1L;
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("updating row " + (count + 1));
TableModel model = myTable.getModel();
int cols = model.getColumnCount();
int row = 0;
for (int j = 0; j < cols; j++) {
row = count;
myTable.changeSelection(row, 0, false, false);
timer.setDelay(200);
Object value = "row " + (count + 1) + " item " + (j + 1);
model.setValueAt(value, count, j);
}
count++;
if (count >= myTable.getRowCount()) {
myTable.changeSelection(0, 0, false, false);
timer.stop();
System.out.println("update cycle completed");
myTable.clearSelection();
startButton.setEnabled(true);
newButton.setEnabled(true);
scroll.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
}
}
};
}
public static void main(String args[]) {
try {
for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
System.out.println(info.getName());
if ("Nimbus".equals(info.getName())) {
UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (UnsupportedLookAndFeelException e) {
// handle exception
} catch (ClassNotFoundException e) {
// handle exception
} catch (InstantiationException e) {
// handle exception
} catch (IllegalAccessException e) {
// handle exception
}
TableWithTimer tableWithTimer = new TableWithTimer();
}
}
class TableBackroundPaint0 extends JTable {
private static final long serialVersionUID = 1L;
TableBackroundPaint0(Object[][] data, Object[] head) {
super(data, head);
setOpaque(false);
((JComponent) getDefaultRenderer(Object.class)).setOpaque(false);
}
@Override
public void paintComponent(Graphics g) {
Color background = new Color(168, 210, 241);
Color controlColor = new Color(230, 240, 230);
int width = getWidth();
int height = getHeight();
Graphics2D g2 = (Graphics2D) g;
Paint oldPaint = g2.getPaint();
g2.setPaint(new GradientPaint(0, 0, background, width, 0, controlColor));
g2.fillRect(0, 0, width, height);
g2.setPaint(oldPaint);
for (int row : getSelectedRows()) {
Rectangle start = getCellRect(row, 0, true);
Rectangle end = getCellRect(row, getColumnCount() - 1, true);
g2.setPaint(new GradientPaint(start.x, 0, controlColor, (int) ((end.x + end.width - start.x) * 1.25), 0, Color.orange));
g2.fillRect(start.x, start.y, end.x + end.width - start.x, start.height);
}
super.paintComponent(g);
}
}
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