我正在尝试在我正在写的当前程序中实现一个功能,我想学习如何向下滚动到JTextArea中的特定文本.例如,让我说我有以下：
JTextArea area = new JTextArea(someReallyLongString);
someReallyLongString将表示一段或一段非常大的文本(垂直滚动条可以在其中显示).所以我想要做的是向下滚动到该文本区域内的特定文本.例如,让someReallyLongString在滚动条的中间附近包含单词“the”(意思是这个词不可见),我将如何向下滚动到那个特定的文本？
谢谢,任何帮助将会非常感激.
解决方法
这是一个非常基本的例子.这样就基本上走过文档来查找单词在文档中的位置,并确保文本被移动到可视区域.
它也突出了比赛
public class MoveToText {
public static void main(String[] args) {
new MoveToText();
}
public MoveToText() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new FindTextPane());
frame.setSize(400,400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class FindTextPane extends JPanel {
private JTextField findField;
private JButton findButton;
private JTextArea textArea;
private int pos = 0;
public FindTextPane() {
setLayout(new BorderLayout());
findButton = new JButton("Next");
findField = new JTextField("Java",10);
textArea = new JTextArea();
textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);
Reader reader = null;
try {
reader = new FileReader(new File("Java.txt"));
textArea.read(reader,null);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
reader.close();
} catch (Exception e) {
}
}
JPanel header = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
header.add(findField,gbc);
gbc.gridx++;
header.add(findButton,gbc);
add(header,BorderLayout.NORTH);
add(new JScrollPane(textArea));
findButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// Get the text to find...convert it to lower case for eaiser comparision
String find = findField.getText().toLowerCase();
// Focus the text area,otherwise the highlighting won't show up
textArea.requestFocusInWindow();
// Make sure we have a valid search term
if (find != null && find.length() > 0) {
Document document = textArea.getDocument();
int findLength = find.length();
try {
boolean found = false;
// Rest the search position if we're at the end of the document
if (pos + findLength > document.getLength()) {
pos = 0;
}
// While we haven't reached the end...
// "<=" Correction
while (pos + findLength <= document.getLength()) {
// Extract the text from teh docuemnt
String match = document.getText(pos,findLength).toLowerCase();
// Check to see if it matches or request
if (match.equals(find)) {
found = true;
break;
}
pos++;
}
// Did we find something...
if (found) {
// Get the rectangle of the where the text would be visible...
Rectangle viewRect = textArea.modelToView(pos);
// Scroll to make the rectangle visible
textArea.scrollRectToVisible(viewRect);
// Highlight the text
textArea.setCaretPosition(pos + findLength);
textArea.moveCaretPosition(pos);
// Move the search position beyond the current match
pos += findLength;
}
} catch (Exception exp) {
exp.printStackTrace();
}
}
}
});
}
}
}
