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Graphics, AWT, Swing I part<br />
offscreen and then displaying the entire screen at once. It is called double buffering<br />
because there are two drawing buffers and you switch between them. Use double<br />
buffering only if the above solution alone does not work. The following code snippet<br />
describes how to do it.<br />
Image offscreenImage;<br />
Graphics offscreenGraphics;<br />
offscreenImage = createImage(size().width, size().height);<br />
offscreenGraphics = offscreenImage.getGraphics();<br />
offscreenGraphics.drawImage(img, 10, 10, this);<br />
g.drawImage(offscreenImage, 0, 0, this);<br />
The following app works fine, but when I start it, I cannot close it using the X at<br />
the right top of the form...<br />
Please help me on the following. I'm just starting to use java (JDK1.3). The<br />
following app works fine, but when I start it, I cannot close it using the X<br />
at the right top of the form. What should I add to fix this problem? The<br />
source is shown below.<br />
import java.awt.*;<br />
import java.awt.event.*;<br />
public class MyApplication extends Frame{<br />
public static void main(String args[]){<br />
Frame f = new Frame("MyApp");<br />
f.setLayout(new FlowLayout());<br />
f.add(new Button("A"));<br />
f.setVisible(true);<br />
}<br />
}<br />
Answer: You should add a listener to handle the closing of the window when the X<br />
box gets clicked on.<br />
f.addWindowListener(new WindowAdapter(){<br />
public void windowClosing(WindowEvent evt){<br />
System.exit(0);<br />
}<br />
});<br />
Read on this, and other ways to do it, in the sections dealing with<br />
event handling, in whichever <strong>Java</strong> text you are using.<br />
How can I set a JFrame to be full screen at the start of a program? I want no<br />
borders, no titles and I just want to use the entire screen.<br />
Answer: Try using JWindow instead, that one can be customized to have no borders<br />
or titles... as for size, I think you can use<br />
setBounds(GraphicsEnvironment.getLocalGraphicsEnvironment().<br />
getDefaultScreenDevice().getDefaultConfiguration().getBounds());<br />
to fill out the entire screen.<br />
Why can not I mix AWT and Swing?<br />
file:///F|/350_t/350_tips/graphics-I.htm (2 of 6) [2002-02-27 21:18:07]