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A GWT UI framework. This component is used as a part of OpenCms, an enterprise-ready, easy to use website content management system based on Java and XML technology. Offering a complete set of features, OpenCms helps content managers worldwide to create and maintain beautiful websites fast and efficiently.

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/*
 * This library is part of Geranium -
 * an open source UI library for GWT.
 *
 * Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)-
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * For further information about Alkacon Software, please see the
 * company website: http://www.alkacon.com
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package com.alkacon.geranium.client.ui.input;

import com.alkacon.geranium.client.ui.I_AutoHider;

/**
 * Basic interface for all widgets that can be used for form fields.
 */
public interface I_FormWidget {

    /**
     * Field type constants.

     * 
     */
    public enum FieldType {
        /** Field type constant for booleans (Java type: Boolean). */
        BOOLEAN,
        /** Field type constant for dates (Java type: Date). */
        DATE,
        /** Field type constant for numbers (Java type: Double). */
        NUMBER,
        /** Field type constant for strings (Java type: String). */
        STRING,
        /** Field type constant for lists of strings (Java type: List). */
        STRING_LIST
    }

    /**
     * Returns the "apparent value", i.e. either the real value if available, or else the ghost value if available, or null otherwise.

     *  
     * @return the apparent value 
     */
    String getApparentValue();

    /**
     * Returns the type of data this widget produces. 
     * @return the data type
     */
    FieldType getFieldType();

    /**
     * Gets the selected/entered value from the widget.

     * 
     * @return the value
     */
    Object getFormValue();

    /**
     * Gets the current value of the widget as a string.

     * 
     * @return the current value of the widget
     */
    String getFormValueAsString();

    /**
     * Returns true if this widget is enabled.

     * 
     * @return true if this widget is enabled
     */
    boolean isEnabled();

    /**
     * Resets the widget to its default state.
     */
    void reset();

    /**
     * Call this when auto hiding parents are shown.

     * 
     * @param autoHideParent the auto hide parent
     */
    void setAutoHideParent(I_AutoHider autoHideParent);

    /**
     * Enables or disables the widget.

     * 
     * @param enabled if true, the widget will be enabled, else disabled
     */
    void setEnabled(boolean enabled);

    /**
     * Sets the error message for this widget.

     * 
     * If the error message is null, no  error message will be displayed.
     * 
     * @param errorMessage an error message or null
     */
    void setErrorMessage(String errorMessage);

    /**
     * Sets the current value of the widget as a string.
     * 
     * @param value the new value of the widget 
     */
    void setFormValueAsString(String value);

}