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There is a newer version: 2.3.0
package cn.mapway.ui.client.widget.common;

import com.google.gwt.regexp.shared.RegExp;
import com.google.gwt.user.client.ui.TextBox;

/**
 * The type Text box ex.
 */
public class TextBoxEx extends TextBox implements IValidator {

    /**
     * Instantiates a new Text box ex.
     */
    public TextBoxEx() {
        setStyleName("gwtEx-TextBox");
    }

    /**
     * Sets place holder.
     *
     * @param placeholder the placeholder
     */
    public void setPlaceHolder(String placeholder) {
        this.getElement().setAttribute("placeholder", placeholder);
    }

    @Override
    public void setMessage(String msg) {
        this.msg = msg;
    }

    private String msg = "";
    /**
     * The Regex.
     */
    protected RegExp regex = null;
    private boolean required = false;

    @Override
    public String getMessage() {
        return msg;
    }

    @Override
    public void setPattern(String pattern) {
        if (pattern != null && pattern.length() > 0) {
            regex = RegExp.compile(pattern);
        } else {
            regex = null;
        }
    }

    @Override
    public void setRequired(boolean b) {
        required = b;
    }

    @Override
    public boolean isValidate() {
        String v = getValue();

        if (required) {

            if (minLength != null) {
                if (v == null || v.length() == 0 || v.length() < minLength) {
                    return false;
                }
            }
            if (maxLength != null) {
                if (v == null || v.length() == 0 || v.length() > maxLength) {
                    return false;
                }
            }

            if (v == null || v.length() == 0) {
                return false;
            } else {
                return regex == null ? true : regex.test(v);
            }
        } else {
            if (v == null || v.length() == 0) {
                return true;
            }

            if (minLength != null) {
                if (v.length() < minLength) {
                    return false;
                }
            }
            if (maxLength != null) {
                if (v.length() > maxLength) {
                    return false;
                }
            }
            return true;
        }
    }

    /**
     * The Min length.
     */
    Integer minLength = null;
    /**
     * The Max length.
     */
    Integer maxLength = null;


    /**
     * 设置最小长度
     *
     * @param minLength the min length
     */
    public void setMinLength(int minLength) {
        this.minLength = minLength;

    }

    /**
     * maxLength
     *
     * @param maxLength the maxLength
     */
    @Override
    public void setMaxLength(int maxLength) {
        this.maxLength = maxLength;
        super.setMaxLength(maxLength);
    }
}