com.google.gwt.user.client.ui.HasVerticalAlignment.java Source code

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Here is the source code for com.google.gwt.user.client.ui.HasVerticalAlignment.java

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/*
 * Copyright 2008 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.user.client.ui;

/**
 * Characteristic interface which indicates that a widget has an associated
 * vertical alignment.
 * 
 * <h3>Use in UiBinder Templates</h3>
 * 
 * <p>
 * The names of the static members of {@link VerticalAlignmentConstant}, as well
 * as simple alignment names (<code>top</code>, <code>middle</code>,
 * <code>bottom</code>), can be used as values for a
 * <code>verticalAlignment</code> attribute of any widget that implements this
 * interface. (In fact, this will work for any widget method that takes a single
 * VerticalAlignmentConstant value.)
 * <p>
 * For example,
 * 
 * <pre>
 * &lt;g:VerticalPanel verticalAlignment='ALIGN_BOTTOM' />
 * &lt;g:VerticalPanel verticalAlignment='bottom' />
 * </pre>
 */
public interface HasVerticalAlignment {

    /**
     * Horizontal alignment constant.
     */
    public static class VerticalAlignmentConstant {
        private final String verticalAlignString;

        private VerticalAlignmentConstant(String verticalAlignString) {
            this.verticalAlignString = verticalAlignString;
        }

        /**
         * Gets the CSS 'vertical-align' string associated with this constant.
         * 
         * @return the CSS 'vertical-align' value
         */
        public String getVerticalAlignString() {
            return verticalAlignString;
        }
    }

    /**
     * Specifies that the widget's contents should be aligned to the bottom.
     */
    VerticalAlignmentConstant ALIGN_BOTTOM = new VerticalAlignmentConstant("bottom");

    /**
     * Specifies that the widget's contents should be aligned in the middle.
     */
    VerticalAlignmentConstant ALIGN_MIDDLE = new VerticalAlignmentConstant("middle");

    /**
     * Specifies that the widget's contents should be aligned to the top.
     */
    VerticalAlignmentConstant ALIGN_TOP = new VerticalAlignmentConstant("top");

    /**
     * Gets the vertical alignment.
     * 
     * @return the current vertical alignment.
     */
    VerticalAlignmentConstant getVerticalAlignment();

    /**
     * Sets the vertical alignment.
     * 
     * @param align the vertical alignment (
     *          {@link HasVerticalAlignment#ALIGN_TOP},
     *          {@link HasVerticalAlignment#ALIGN_MIDDLE}, or
     *          {@link HasVerticalAlignment#ALIGN_BOTTOM}).
     */
    void setVerticalAlignment(VerticalAlignmentConstant align);
}