spacer.java

J2me唆哈的代码

/*
 * @(#)Spacer.java	1.21 02/10/07 @(#)
 *
 * Copyright (c) 2002 Sun Microsystems, Inc.  All rights reserved.
 * PROPRIETARY/CONFIDENTIAL
 * Use is subject to license terms.
 */

package javax.microedition.lcdui;
import java.lang.IllegalArgumentException;

public class Spacer extends Item {

    public Spacer(int minWidth, int minHeight) {
        super(null);
        updateSizes(minWidth, minHeight);
    }

    public void setMinimumSize(int minWidth, int minHeight) {
        updateSizes(minWidth, minHeight);
    }

    public void addCommand(Command cmd) {
        throw new IllegalStateException();
    }

    public void setDefaultCommand(Command cmd) {
        throw new IllegalStateException();
    }

    public void setLabel(String label) { 
        throw new IllegalStateException();
    }

    // package private implementation

    int callMinimumWidth() {
        return width;
    }

    int callPreferredWidth(int h) {
        return width;
    }

    int callMinimumHeight() {
        return height;
    }


    int callPreferredHeight(int w) {
        return height;
    }

    boolean shouldSkipTraverse() {
        return true;
    }

    void callPaint(Graphics g, int w, int h) {
        /*
         * There's no reason to erase anything because Form will erase
         * any dirty region for us
         *
        g.setColor(Display.ERASE_COLOR);
	    g.fillRect(g.getClipX(), g.getClipY(),
                   g.getClipWidth(), g.getClipHeight());
        g.setColor(Display.FG_COLOR);
        */
    }


    private void updateSizes(int minW, int minH) {
        if (minW < 0 || minH < 0) {
             throw new IllegalArgumentException();
        }

        synchronized (Display.LCDUILock) {
            width  = minW;
            height = minH;
            //invalidate();
        }
    }

    /** The preferred (and minimum) width of this Spacer */
    private int width;

    /** The preferred (and minimum) height of this Spacer */
    private int height;

}