PromptedTextBox.java

package com.gwt.ui.client;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.FocusEvent;
import com.google.gwt.event.dom.client.FocusHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.user.client.ui.TextBox;

public class PromptedTextBox extends TextBox implements KeyPressHandler, FocusHandler, ClickHandler {
    
    private String promptText;
    private String promptStyle;
    
    public PromptedTextBox(String promptText, String promptStyleName) {
        this.promptText = promptText;
        this.promptStyle = promptStyleName;
        this.addKeyPressHandler(this);
        this.addFocusHandler(this);
        this.addClickHandler(this);
        showPrompt();
        
    }
    
    public void showPrompt() {
        if (!("").equals(promptStyle))
            this.addStyleName(promptStyle);
        this.setText(this.promptText);
        
    }
    
    @Override
    public void onKeyPress(KeyPressEvent event) {
        if (promptText.equals(this.getText()) && !(event.getNativeEvent().getKeyCode() == KeyCodes.KEY_TAB)) {
            hidePrompt();
        }
        
    }
    
    public void hidePrompt() {
        this.setText("");
        if (!("").equals(promptStyle))
            this.removeStyleName(promptStyle);
    }
    
    @Override
    public void onFocus(FocusEvent arg0) {
        this.setCursorPos(0);
    }
    
    @Override
    public void onClick(ClickEvent arg0) {
        if (promptText.equals(this.getText()))
            hidePrompt();
    }

 
}