layout.java

有关j2me的很好的例子可以研究一下

/*
 * @(#)Layout.java	1.4 01/07/12
 * Copyright (c) 1999-2001 Sun Microsystems, Inc. All Rights Reserved.
 *
 * This software is the confidential and proprietary information of Sun
 * Microsystems, Inc. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Sun.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 */
package javax.microedition.lcdui;

/**
 * A Layout is a special class used to layout certain
 * types of screen components
 */
interface Layout {

    /**
     * Get the width of this Layout
     *
     * @return int The pixel width of this Layout
     */
    int getWidth();
    /**
     * Set the width of this Layout
     *
     * @param w The maximum allowable width for this Layout
     * @return int The height required to display this Layout
     *              given the maximum allowable width
     */
    int setWidth(int w); // sets height
    /**
     * Get the height of this Layout
     *
     * @return int The pixel height of this Layout
     */
    int getHeight();
    /**
     * Set the maximum allowable height for this Layout
     *
     * @param h The maximum height for this Layout
     */
    void setMaxHeight(int h);
    /**
     * Get the line height for this Layout
     *
     * @return int The line height in pixels for this Layout
     */
    int getLineHeight();
    /**
     * Paint this Layout
     *
     * @param g The Graphics context to paint to
     * @param eraseBgrnd A boolean flag to erase the background prior to
     *                      painting
     * @param inverted A boolean flag to paint the Layout in an inverted
     *                  color scheme
     */
    void paint(Graphics g, boolean eraseBgrnd, boolean inverted);
}