java - 制作在 JPanel 上显示的网格布局

Question

我的任务是在 JPAnel 上创建检查板。为此，我尝试使用具有边框的 JPanel 填充父 JPanel，但由于某种原因，代码没有给出所需的结果，并且没有显示错误来调查原因。这是代码:

private static class GlassView extends JFrame {

        private static int width = 600;
        private static int height = 750;

        public GlassView() {
            this.setSize(width, height);
            this.setVisible(true);
            this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        }

        public static void workingFrame() {
            int cols = 0;
            int rows = 0;
            String frameName = "Bot World";

            WorkFrame workF = new WorkFrame(0, 0, frameName);
            wfFrame = workF.newFrame();
            wfFrame.setExtendedState(JFrame.MAXIMIZED_BOTH);
            wfFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            wfFrame.setVisible(true);

            JSplitPane splitPane = new JSplitPane();
            splitPane.setSize(width, height);
            splitPane.setDividerSize(0);
            splitPane.setDividerLocation(150);
            splitPane.setOrientation(JSplitPane.HORIZONTAL_SPLIT);

            JPanel panelLeft = createLftPanel();
            JPanel panelRight = createRightPanel();

            splitPane.setLeftComponent(panelLeft);
            splitPane.setRightComponent(panelRight);
            wfFrame.add(splitPane);
        }
    }

以下是需要检查的 panelRight 的代码:

public static JPanel createRightPanel() {
        JPanel panel = new JPanel();
        int rows = 100;
        int cols = 100;
        panel.setLayout(new GridLayout(rows, cols));
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                JPanel pane = new JPanel();
                pane.add(new JTextField("both"));
                pane.setBorder(BorderFactory.createLineBorder(Color.black));
                panel.add(new JButton(""));
            }
        }
        return panel;
    }

任何帮助将不胜感激。谢谢

Answer 1

好吧，我的(第二个)猜测是在调用

之后框架不会再次布局

wfFrame.setVisible(true);

对于我来说，下面的例子:

public class Framed {
    public static void workingFrame() {
        JFrame frame = new JFrame();
        frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        frame.getContentPane().add(createRightPanel(10, 10));

        frame.revalidate(); // <-- HERE
    }

    public static JPanel createRightPanel(int rows, int cols) {
        JPanel panel = new JPanel(new GridLayout(rows, cols));
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                JPanel pane = new JPanel();
                pane.setBackground((i+j)%2==0?Color.black:Color.white);
                panel.add(pane);
            }
        }
        return panel;
    }

    public static void main(String... none) throws Exception {
        workingFrame();
    }
}

显示棋盘格网格，但您是否删除了对

的调用

        frame.revalidate(); // <-- HERE

然后，网格不会显示(直到您对框架执行某些操作，使其再次布局)。不过，比调用 revalidate() 更好的方法可能是仅在添加所有组件后才调用 setVisible。