[英]Wrapping an editable JTextArea around a non-editable text in Java
I'm making a command prompt using Swing. 我正在使用Swing进行命令提示符。 I'm using an editable JTextArea for the input, but I don't want to area before the input to be editable (the
C:\\Windows\\system32>
). 我正在使用可编辑的JTextArea作为输入,但是我不想在输入可编辑之前放置区域(
C:\\Windows\\system32>
)。
The only method I know of that can do this is this: Make parts of a JTextArea non editable (not the whole JTextArea!) 我知道的唯一可以做到这一点的方法是: 使JTextArea的各个部分不可编辑(而不是整个JTextArea!)。
Are there any other ways? 还有其他方法吗?
Just the beginning
只是开始
Then you can do something like: 然后,您可以执行以下操作:
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
public class NavigationFilterPrefixWithBackspace extends NavigationFilter
{
private int prefixLength;
private Action deletePrevious;
public NavigationFilterPrefixWithBackspace(int prefixLength, JTextComponent component)
{
this.prefixLength = prefixLength;
deletePrevious = component.getActionMap().get("delete-previous");
component.getActionMap().put("delete-previous", new BackspaceAction());
component.setCaretPosition(prefixLength);
}
public void setDot(NavigationFilter.FilterBypass fb, int dot, Position.Bias bias)
{
fb.setDot(Math.max(dot, prefixLength), bias);
}
public void moveDot(NavigationFilter.FilterBypass fb, int dot, Position.Bias bias)
{
fb.moveDot(Math.max(dot, prefixLength), bias);
}
class BackspaceAction extends AbstractAction
{
public void actionPerformed(ActionEvent e)
{
JTextComponent component = (JTextComponent)e.getSource();
if (component.getCaretPosition() > prefixLength)
{
deletePrevious.actionPerformed( null );
}
}
}
public static void main(String args[]) throws Exception {
JTextField textField = new JTextField("Prefix_", 20);
textField.setNavigationFilter( new NavigationFilterPrefixWithBackspace(7, textField) );
JFrame frame = new JFrame("Navigation Filter Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(textField);
frame.pack();
frame.setLocationRelativeTo( null );
frame.setVisible(true);
}
}
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