可能重复：
iframe over applet 闪烁
当我把iframe它放在小程序上时，它会闪烁并闪烁很多。
这就是我认为造成它的原因。
// Create a timer that will handle the canvas updates, effectively drawing it at the desired FPS
tickTimer = new javax.swing.Timer(1000/Constants.APPLET_FRAMERATE, new ActionListener() {
public void actionPerformed(ActionEvent e) {
update(AvatarClient.instance.getGraphics());
}
});
// Start the timer
tickTimer.start();
这是源代码：
package main;
import java.applet.Applet;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.MediaTracker;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javascript.JavascriptCommands;
import javax.swing.JOptionPane;
import javax.swing.Timer;
import client.GraphicsHandler;
import client.avatar.AvatarController;
import client.guiboxes.QuestionBox;
import client.moods.MoodController;
import client.rooms.RoomController;
import client.tools.StuffPreloader;
import networking.ConnectionHandler;
import networking.NetworkMessage;
import networking.NetworkingConstants;
import misc.Constants;
import misc.Language;
public class AvatarClient extends jApplet{
/**
*
*/
private static final long serialVersionUID = 3792036962966286054L;
public GraphicsHandler canvas;
public ConnectionHandler connection;
Timer tickTimer;
public MediaTracker mediaTracker;
public String userName = "a"; //$NON-NLS-1$
public String localizationFolder = "";
public static AvatarClient instance;
/* called when the Applet is loaded */
public void init() {
instance = this;
//setSize(new Dimension( Constants.APPLET_WIDTH, Constants.APPLET_HEIGHT ) );
// SET THE APPLET SIZE
// Get the applet parameters
userName = getParameter("userName"); //$NON-NLS-1$
String password = getParameter("password"); //$NON-NLS-1$
localizationFolder = getParameter("localization");
// Create a mediatracker for image loding
mediaTracker = new MediaTracker(this);
System.out.println("Jesper er sej!");
canvas = new GraphicsHandler(this);// Create a canvas, all the drawing is done within the canvas
canvas.setStatusMsg(Language.getString("AvatarClient.connectMessage")); // Apply a status message //$NON-NLS-1$
canvas.setPreferredSize(new Dimension(Constants.APPLET_WIDTH, Constants.APPLET_HEIGHT));
// Adjust the applet options as well ( THIS SHOULD REMOVE THE BLINKING )
setBackground(new java.awt.Color(229, 229, 229));
setMaximumSize(new java.awt.Dimension(Constants.APPLET_WIDTH, Constants.APPLET_HEIGHT));
setPreferredSize(new java.awt.Dimension(Constants.APPLET_WIDTH, Constants.APPLET_HEIGHT));
setSize(new java.awt.Dimension(Constants.APPLET_WIDTH, Constants.APPLET_HEIGHT ));
setLayout(null);
this.setIgnoreRepaint(true);
this.add(canvas);
validate();
// FINALLY, create a connection handler thread ( It tries to connect to the as the first thing it does )
connection= new ConnectionHandler(this, userName, password);
new Thread(connection).start();
// Create a timer that will handle the canvas updates, effectively drawing it at the desired FPS
tickTimer = new javax.swing.Timer(1000/Constants.APPLET_FRAMERATE, new ActionListener() {
public void actionPerformed(ActionEvent e) {
update(AvatarClient.instance.getGraphics());
}
});
// Start the timer
tickTimer.start();
// Add mouse and keyboard listeners to the canvas of this applet
canvas.addMouseListener(EventsHandler.getInstance());
canvas.addKeyListener(EventsHandler.getInstance());
canvas.addMouseMotionListener(EventsHandler.getInstance());
//System.out.println(canvas.);
//this.setFocusable(false);
new JavascriptCommands();
// Preload some of the gui elements
StuffPreloader.instance.loadStuff();
// TO OVERCOME THE SECURITY PROBLEMS FOR CALLING NEW NOTIFICATIONS FROM JS
Timer notif = new javax.swing.Timer(100, new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(newNotif) {
GraphicsHandler.instance.addQbox(notif_title, notif_text, QuestionBox.QUESTION_TIPBOX, 0);
newNotif = false;
}
}
});
// Start the timer
notif.start();
notif.setRepeats(true);
// Get focus to this applet
getFocusBack();
}
boolean newNotif = false;
String notif_text, notif_title;
// START AND WHEN USER RETURNS
public void start() {
//setSize(new Dimension( Constants.APPLET_WIDTH, Constants.APPLET_HEIGHT ) );
getFocusBack();
GraphicsHandler.instance.stepsToDraw = 30;
}
public void stop() {
//connection.closeConnection();
}
/* Applet termination */
public void destroy() {
tickTimer.stop(); // Stop the update timer
}
// OVERRIDE
public void update(Graphics g) {
canvas.update(g);
}
public void paint(Graphics g) {
//canvas.requestFocus(); // Try to get focus so the user doesnt have to click for chat input
}
public void showError(String message) {
JOptionPane.showMessageDialog(this,
"Error:\n\n" + message, //$NON-NLS-1$
"Error!", //$NON-NLS-1$
JOptionPane.ERROR_MESSAGE);
}
public void getFocusBack() {
canvas.requestFocus(); // Try to get focus so the user doesnt have to click for chat input
canvas.requestFocusInWindow();
}
/**************************
/** JAVASCRIPT COMMANDS
* *****************************/
public void changeRoom(int id) {
getFocusBack();
NetworkMessage msg = new NetworkMessage();
msg.add(NetworkingConstants.N_ROOMCHANGE);
msg.add((int)id); // REquest for data
msg.send(connection.out);
}
public void changeMood(int id) {
getFocusBack();
MoodController.instance.SetMoodByIndex(id);
}
public void nextMood() {
getFocusBack();
MoodController.instance.SetNextMood();
}
public void previousMood() {
getFocusBack();
MoodController.instance.SetPreviousMood();
}
public void openLogView() {
getFocusBack();
AvatarController.instance.outputLog();
}
public void refreshSidebar() {
RoomController.instance.updateSidebarInfo(true);
}
public void openWardrobe() {
getFocusBack();
// OPEN WARDROBE
NetworkMessage msg = new NetworkMessage();
msg.add(NetworkingConstants.N_WARDROBEUPDATE);
msg.add((short)-2);
msg.send(ConnectionHandler.instance.out);
}
public void notifyB() {
System.out.println("addnotification: ");
}
public void addNotification(String title, String text) {
getFocusBack();
notif_title = title;
notif_text = text;
newNotif = true;
//GraphicsHandler.instance.addQbox("This is a test message lores ipsum testing the line flow with a longer text, I wonder how it will work", QuestionBox.QUESTION_APARTMENT, 123); //$NON-NLS-1$ //$NON-NLS-2$
//GraphicsHandler.instance.addQbox(text, title, QuestionBox.QUESTION_TIPBOX, 0);
}
public void placeItem(int itemID) {
NetworkMessage msg = new NetworkMessage();
msg.add(NetworkingConstants.N_ITEMPLACEMENT);
msg.add((short)1); // Placing the item
msg.add((short)itemID);
msg.send(ConnectionHandler.instance.out);
}
public void forceFocus() {
Timer focusBack = new javax.swing.Timer(150, new ActionListener() {
public void actionPerformed(ActionEvent e) {
getFocusBack();
}
});
// Start the timer
focusBack.start();
focusBack.setRepeats(false);
}
}
但有可能以另一种方式实现吗？