JFrame 不采用实际的屏幕尺寸

2022-01-24 00:00:00 java swing jframe

我一直在尝试将 JFrame 的大小设置为与屏幕大小完全相同 (2256x1504).它似乎也采用了那个大小，但是当我展示某些东西时，结果总是比预期的要大.

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);
    }
}

推荐答案

int width = 2256;
int height = 1504;

猜测您的屏幕是 2556x1504.你给框架这个尺寸.当我们全屏显示程序时(从默认按钮 OS 在窗口右上角给出)，它不会获得屏幕大小.它需要屏幕的大小 - 操作系统任务栏的高度.其他操作系统我不知道，但是如果你想在windows中做一个不装饰的框架全屏并涉及到任务栏，你必须使用这个:

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();
    }


}

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