以下是snapshot of my problem。在这里我按下了3号标签的关闭按钮，但它要求保存标签1的工作
以下是我的文件Tab.java
中的代码
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.Element;
public class Tab {
JTextArea textArea, linesTestarea;
JScrollPane scrollPane;
JTabbedPane tabbedPane;
JLabel label;
final JButton button = new JButton("x");;
boolean newFile;
String filename, filepath;
JPanel panel;
public Tab(JTabbedPane tabbedPane) {
this.tabbedPane = tabbedPane;
newFile = true;
filename = "untitled.txt";
}
public Tab addTab(boolean newBlankTab) {
textArea = new JTextArea();
setLineNumberProperty();
textArea.setFont(new Font("Serif", Font.PLAIN, StaticVariables.fontSize));
scrollPane = new JScrollPane();
tabbedPane.addTab(null, scrollPane);
tabbedPane.setSelectedIndex(tabbedPane.getTabCount() - 1);
tabbedPane.setTabComponentAt(tabbedPane.getTabCount() - 1,
addPaneltoTabs(new JPanel()));
tabbedPane.setBackgroundAt(tabbedPane.getSelectedIndex(),
Color.lightGray);
System.out.println("from add tab " + tabbedPane.getSelectedIndex());
filepath = new File(filename).getAbsolutePath();
if (newBlankTab)
StaticVariables.openedfiles.add(filepath);
textArea.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void removeUpdate(DocumentEvent arg0) {
linesTestarea.setText(showLineNumber(textArea));
setTabTitle();
if (StaticVariables.unsavedfiles.contains(getFilePath()) == false) {
StaticVariables.unsavedfiles.add(getFilePath());
}
}
@Override
public void insertUpdate(DocumentEvent arg0) {
linesTestarea.setText(showLineNumber(textArea));
if (StaticVariables.unsavedfiles.contains(getFilePath()) == false) {
setTabTitle();
StaticVariables.unsavedfiles.add(getFilePath());
}
}
@Override
public void changedUpdate(DocumentEvent arg0) {
linesTestarea.setText(showLineNumber(textArea));
setTabTitle();
if (StaticVariables.unsavedfiles.contains(getFilePath()) == false) {
StaticVariables.unsavedfiles.add(getFilePath());
}
}
});
scrollPane.setViewportView(textArea);
scrollPane.setRowHeaderView(linesTestarea);
return this;
}
public JPanel addPaneltoTabs(JPanel panel) {
panel.setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0));
panel.setOpaque(false);
filename = filename + tabbedPane.getSelectedIndex();
System.out.println("from label" + tabbedPane.getSelectedIndex());
label = new JLabel(filename);
label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));
panel.add(label);
setTabButtonProperty();
panel.add(button);
button.addMouseListener(new MouseAdapter() {
@Override
public void mouseEntered(MouseEvent e) {
System.out.println(button.getParent().getParent()
.getComponent(0));
button.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 1,
new Color(0.200f, 0.123f, 0.123f, .2f)));
button.setFont(StaticVariables.btnEnteredFont);
button.setForeground(Color.BLACK);
}
public void mouseExited(MouseEvent e) {
button.setBorder(BorderFactory.createEmptyBorder());
button.setFont(StaticVariables.btnExitedFont);
button.setForeground(Color.WHITE);
}
public void mouseClicked(MouseEvent e) {
if (StaticVariables.unsavedfiles.contains(getFilePath())) {
String activeFilename = new File(getFilePath()).getName();
int opt = JOptionPane.showOptionDialog(null, activeFilename
+ " is not saved", "Sodalime Save files alert",
JOptionPane.YES_NO_CANCEL_OPTION,
JOptionPane.QUESTION_MESSAGE, null,
(Object[]) obj(), null);
if (opt == 0) {
} else if (opt == 1) {
removeTabs();
} else {
Tab temp = StaticVariables.tablist.get(tabbedPane
.getSelectedIndex());
FileAction fa = new FileAction();
fa.FileSaveaction(temp);
removeTabs();
}
} else {
removeTabs();
}
}
});
return panel;
}
public void showTabList() {
JPanel tabPanel = new JPanel();
tabPanel.setSize(200, StaticVariables.tablist.size() * 10);
}
public String showLineNumber(JTextArea textArea) {
int caretPosition = textArea.getDocument().getLength();
Element root = textArea.getDocument().getDefaultRootElement();
String text = "1" + System.getProperty("line.separator");
for (int i = 2; i < root.getElementIndex(caretPosition) + 2; i++) {
text += i + System.getProperty("line.separator");
}
return text;
}
public void setTabButtonProperty() {
button.setOpaque(false);
button.setFocusPainted(false);
button.setContentAreaFilled(false);
button.setPreferredSize(new Dimension(20, 20));
button.setToolTipText("close this tab");
button.setFocusable(false);
button.setBorder(BorderFactory.createEmptyBorder());
button.setForeground(Color.WHITE);
}
public void setLineNumberProperty() {
Dimension d = new Dimension(20, textArea.getHeight());
linesTestarea = new JTextArea("1");
linesTestarea.setPreferredSize(d);
linesTestarea.setBorder(BorderFactory.createEmptyBorder(7, 0, 0, 1));
linesTestarea.setEditable(false);
linesTestarea.setFont(new Font("Serif", Font.ITALIC,
StaticVariables.fontSize));
linesTestarea.setForeground(StaticVariables.linesColor);
}
public Object obj() {
String options[] = { "Cancel", "close anyway", "Save and close" };
return options;
}
public void removeTabs() {
try {
StaticVariables.openedfiles.remove(tabbedPane.getSelectedIndex());
StaticVariables.tablist.remove(tabbedPane.getSelectedIndex());
tabbedPane.remove(tabbedPane.getSelectedIndex());
} catch (Exception ee) {
ee.printStackTrace();
}
}
public void setTabTitle() {
this.label.setFont(StaticVariables.tabUnsavedTitleFont);
}
public String getFilePath() {
return StaticVariables.openedfiles.get(tabbedPane.getSelectedIndex());
}
}
在附加的快照中，选中的选项卡是选项卡1，因此，由于方法getFilePath（），每当我按下关闭按钮时，它将返回所选选项卡的索引，而不是按钮实际关联的索引。那么如何使与3号标签相关联的按钮实际上关闭了3号标签？
StaticVariables类包含以下代码
public class StaticVariables {
public static int minWidth = GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width;
public static int minHeight = GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().height;
public static int menubarHeight = 150;
public static int initialXcoordinates = 0;
public static int initialYcoordinates = 0;
public static int fontSize = 18;
public static Color textareabgcolor = new Color(0.200f, 0.123f, 0.123f, .5f);
public static Color linesColor = new Color(0.123f, 0.123f, 0.123f, .5f);
public static ArrayList<Tab> tablist = new ArrayList<Tab>();
public static ArrayList<String> unsavedfiles = new ArrayList<String>();
public static ArrayList<String> openedfiles = new ArrayList<String>();
public static ArrayList<String> fromOpenfile = new ArrayList<String>();
public static Font btnEnteredFont = new Font("Times new Roman", Font.BOLD, 18);
public static Font btnExitedFont = new Font("Times new Roman", Font.PLAIN, 18);
public static Font tabUnsavedTitleFont = new Font("Times new Roman", Font.BOLD, 16);
public static Font tabSavedTitleFont = new Font("Times new Roman", Font.PLAIN, 16);
}
这个问题让我的步伐变得非常慢，所以如果有人需要完整的源代码就可以了LINK
答案 0 :(得分：0)
您错误地使用了JOptionPane。可以读取对话框选项创建参数详细信息here -
现在，当您选择了YES_NO_CANCEL_OPTION时，您传递的参数列表应为new String[]{ "Label For Yes Button", "Label For No Button", "Label For Cancel Button" }
将您的硬编码代码替换为JOptionPane常量，如下所示
if (opt == JOptionPane.CANCEL_OPTION) {
//Do nothing
} else if (opt == JOptionPane.NO_OPTION) {
removeTabs();
} else {
Tab temp = StaticVariables.tablist.get(tabbedPane.getSelectedIndex());
FileAction fa = new FileAction();
fa.FileSaveaction(temp);
removeTabs();
}
您仍将面临ArrayIndexOutOfBounds例外的问题。确保您的StaticVariables.tablist，StaticVariables.unsavedfiles，StaticVariables.openedfiles，StaticVariables.fromOpenfile与当前窗口状态一致。意味着它们应该包含正确的值，直到与它们对应的选项卡可见，并且当它们的选项卡不存在时不应该存在。