bqalert.java

J2me唆哈的代码

/*
 * Created on 2005-9-21 by pcy
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package a.a.a.midp.lcdui;

import java.util.Timer;
import java.util.TimerTask;

import javax.microedition.lcdui.*;

import a.a.a.b.Resource;



public class BQAlert extends BQScreen {

    public static final long serialVersionUID=1;
    
    private BQDisplayable nextDisplayable;
    
    private static final Command OK =
        new Command(Resource.getString("Done"), Command.OK, 0);

    /**
     * Default spacing between elements of this Alert
     */
    private static final int CELL_SPACING = 6;

    /**
     * Number of pixels to scroll when using up/down keys
     */
    private static final int SCROLL_AMOUNT = 40;

    /**
     * The default timeout of all alerts
     */
    private static final int DEFAULT_TIMEOUT = 2000;

    /**
     * The type of this alert
     */
    private BQAlertType type;

    /**
     * The layout object for the alert text string
     */
    private String text;

    /**
     * The image of this alert
     */
    private BQImage image;

    /**
     * A reference to the original, mutable Image passed to setImage(). This
     * is only so getImage() can return the correct Image Object.
     */
    private BQImage mutableImage;

    /**
     * The activity indicator for this alert
     */
    private BQGauge indicator;

    /**
     * The timeout value of this alert
     */
    private int time;

    /**
     * The overall height of this alert
     */
    private int height;

    /**
     * A Timer which serves all Alert objects to schedule
     * their timout tasks
     */
    private static Timer timeoutTimer=new Timer();

    /**
     * A TimerTask which will be set to expire this Alert after
     * its timeout period has elapsed.
     */
    //private TimerTask timerTask;

    /**
     * The screen which the display will return to when this Alert
     * is completed
     */
    private BQDisplayable returnScreen;
    
    /**
     * The application's command listener
     */
    private BQCommandListener userCommandListener;
    
    public BQAlert(String title,
            String alertText,
            BQImage alertImage,
            BQAlertType alertType){
        
        super(title);
        this.time = DEFAULT_TIMEOUT;
        this.text = alertText;
        this.type = alertType;
        setImageImpl(alertImage);
        
    }

    public int getDefaultTimeout(){
        return DEFAULT_TIMEOUT;
    }
    
    public int getTimeout(){
        if ((height > super.getDisplayHeight()) || (getCommandCount() > 1)) {
                return Alert.FOREVER;
        } else {
                return time;
        }
    }
    
    public void setTimeout(int time){
        if (time <= 0 && time != Alert.FOREVER) {
            throw new IllegalArgumentException();
        }
        this.time = time;
    }
    
    public BQAlertType getType(){
        return type;
    }
    
    public void setType(BQAlertType type){
        this.type = type;
    }
    
    public String getString(){
        return text;
    }
    
    public void setString(String str){
        text = str;
    }
    
    public BQImage getImage(){
        
        if (mutableImage != null) {
            return mutableImage;
        } else {
            return image;
        }
    }
    
    public void setImage(BQImage img){
        setImageImpl(img);
    }
    
    public void setIndicator(BQGauge indicator){
    
        if (indicator == null) {
            if (this.indicator != null) {
                this.indicator.setOwner(null);
            }
        } else {
            if (!isConformantIndicator(indicator)) {
                throw new IllegalArgumentException("Gauge in wrong state");
            }
            indicator.setOwner(this);
        }
        if (this.indicator != null) {
            this.indicator.setOwner(null);
        }

        this.indicator = indicator;
    }
    
    public BQGauge getIndicator(){
        return indicator;
    }
    
    /*
    public void setCommandListener(BQCommandListener l){
        userCommandListener = l;
    }*/
    
    void setImageImpl(BQImage img) {
        if (img != null && img.isMutable()) {
            this.image = BQImage.createImage(img);   // use immutable copy of img
            this.mutableImage = img;
        } else { 
            this.image = img;
            this.mutableImage = null;        // Make sure to clear mutableImage
        }
    }
    
    void showNotify(){
    	if(this.getTimeout()!=Alert.FOREVER){
    		timeoutTimer.schedule(new TimerTask(){
    			public void run(){
    				dismiss();
    			}
    		},time);
    	}
    }
    
    void hideNotify(){
    	
    }
    
    boolean isConformantIndicator(BQGauge ind) {
        return ((ind.isInteractive() == false) &&
                (ind.getOwner() == null) &&
                (ind.getCommandCount() == 0) &&
                (ind.getItemCommandListener() == null) &&
                (ind.getLabel() == null) &&
                (ind.getMLayout() == Item.LAYOUT_DEFAULT) &&
                (ind.lockedWidth == -1) &&
                (ind.lockedHeight == -1));
    }

    
    private void dismiss(){
    	Display.getDisplay(null).setCurrent(nextDisplayable.shell);
    }
    
    public void setNextDisplayable(BQDisplayable d){
    	nextDisplayable=d;
    }
}