问题
I have been trying to set the size of my JFrame to the exact same size of my screen (2256x1504). It also seems to take that size but when I display something the outcome is always bigger than intended.
public class Frame extends JFrame {
public Frame() {
JPanel p = new JPanel();
int width = 2256;
int height = 1504;
Dimension size = new Dimension(width,height);
p.setPreferredSize(size);
p.setMinimumSize(size);
p.setMaximumSize(size);
p.setSize(size);
this.setUndecorated(true);
this.setContentPane(p);
this.pack();
this.setResizable(false);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setAlwaysOnTop(true);
this.setVisible(true);
}
}
回答1:
int width = 2256;
int height = 1504;
Guessing your screen is 2556x1504. You give the frame this size. When we full screen a program (from default button OS gives in upper right corner of the window), it does not get screen's size. It takes screen's size - the height of the OS task bar. I do not know for other operating systems, but if you want to make an undecorated frame full screen in windows and involve the task bar, you have to use this:
public class Frame extends JFrame {
public Frame() {
JPanel p = new JPanel();
int width = 2256;
int height = 1504;
Dimension size = getScreenDimensionWithoutTaskbar(this);
p.setPreferredSize(size);
p.setMinimumSize(size);
p.setMaximumSize(size);
p.setSize(size);
this.setUndecorated(true);
this.setContentPane(p);
this.pack();
this.setResizable(false);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setAlwaysOnTop(true);
this.setVisible(true);
}
public static Dimension getScreenDimensionWithoutTaskbar(Frame frame) {
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
int width = screenSize.width;
int height = screenSize.height;
Insets screenInsets = Toolkit.getDefaultToolkit().getScreenInsets(frame.getGraphicsConfiguration());
int taskBarSize = screenInsets.bottom;
return new Dimension(width, height - taskBarSize);
}
public static void main(String[] args) {
new Frame();
}
}
回答2:
I have been trying to set the size of my JFrame to the exact same size of my screen (2256x1504).
Don't use magic numbers. Each computer can be using a screen with a different resolution. Let Swing determine the size. Use:
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
So the basic structure of the code would be:
JPanel panel = new JPanel();
add( panel );
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setAlwaysOnTop(true);
setUndecorated(true);
//setResizable(false); // not needed since the title bar is removed
setExtendedState(JFrame.MAXIMIZED_BOTH);
//pack(); // not needed since the frame will be the screen size
setVisible(true);
来源:https://stackoverflow.com/questions/60787057/jframe-doesnt-take-the-actual-screen-size