Example usage for javax.swing JFormattedTextField addCaretListener

Introduction

In this page you can find the example usage for javax.swing JFormattedTextField addCaretListener.

Prototype

public void addCaretListener(CaretListener listener) 

Source Link

Document

Adds a caret listener for notification of any changes to the caret.

Usage

From source file:Main.java

public static void main(String... args) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel contentPane = new JPanel();

    JFormattedTextField ftf = new JFormattedTextField(NumberFormat.getNumberInstance());
    ftf.setColumns(10);//www  .j a  v  a2 s. co m
    ftf.setFocusLostBehavior(JFormattedTextField.PERSIST);
    ftf.setValue(100);
    lastValidValue = "100";
    ftf.addCaretListener(e -> {
        System.out.println("Last Valid Value : " + lastValidValue);
        if (ftf.isEditValid()) {
            String latestValue = ftf.getText();
            System.out.println("Latest Value : " + latestValue);
            if (!(latestValue.equals(lastValidValue)))
                ftf.setBackground(Color.YELLOW.darker());
            else {
                lastValidValue = ftf.getText();
                ftf.setBackground(Color.WHITE);
            }
        } else {
            System.out.println("Invalid Edit Entered.");
        }
    });
    contentPane.add(ftf);
    frame.setContentPane(contentPane);
    frame.pack();
    frame.setVisible(true);
}

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