package com.onaro.util.jfc;

import java.awt.Color;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;

import javax.swing.JTextField;

import org.apache.commons.lang3.StringUtils;

/**
 * This text field will disply a hint text (grayed out) while is empty and not being edited.
 * It could be used to help the user understand the information and format to enter the field
 * Get the text directly from the field and not the document (not supported).
 */
public class HintedJTextField extends JTextField implements FocusListener{
    private static final long serialVersionUID = 1L;
    private static final Color HINTED_COLOR = Color.gray.brighter();
    private String hint;
    private Color regularColor;

    public HintedJTextField(String hint) {
        super(hint);
        this.hint = hint;
        this.regularColor = this.getForeground();
        setForeground(HINTED_COLOR);
        addFocusListener(this);
    }

    public void focusGained(FocusEvent e) {
        if (hint.equals(super.getText()) && isFocusOwner()) {
            super.setText(null); 
            setForeground(regularColor);
        }
    }

    public void focusLost(FocusEvent e) {
        if (super.getText().length() < 1) {
            super.setText(hint);
            setForeground(HINTED_COLOR);
        }
    }

    public String getText() {
        String text = super.getText();
        return text.equals(hint) ? StringUtils.EMPTY : text; 
    }

    public void setText(String text){
        if(text.length() < 1){
            text = hint;
            setForeground(HINTED_COLOR);
        }else{
            setForeground(regularColor);
        }
        super.setText(text);
    }
}