如何将jscrollpane添加到jframe？ [英] how to add jscrollpane to jframe?

问题描述

我有以下源代码...有人可以给我一个如何将jscrollpane添加到jframe的建议吗？我尝试了几次将它添加到jframe但没有任何进展。它甚至没有显示。

I have following source code...Can someone please give me an advice how to add jscrollpane onto jframe? I tried several time to add it to jframe but without any progress. It is not even showing.

public class Form3 {
        JFrame jframe = new JFrame("Etiket print.");
        JPanel panel1 = new JPanel();
        JPanel panel2 = new JPanel();
        JPanel panel3 = new JPanel();
        JPanel panel4 = new JPanel();
        JScrollPane scrollFrame = new JScrollPane(panel2);
        Color myBlue1Color = new Color(168, 175, 247);
        Color myBlue2Color = new Color(139, 146, 255);



           public Form3(){
                jframe.setMinimumSize(new Dimension(1280, 1000));
                panel2.setLayout(new BoxLayout(panel2, BoxLayout.Y_AXIS));
                panel2.setAutoscrolls(true);
                jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                //---------------------------------Header
                panel1 = createSquareJPanel(Color.YELLOW, 600,200);
                panel3 = createSquareJPanel(Color.GREEN, 400,200);
                panel4 = createSquareJPanel(Color.white, 280,200);
                JPanel container = new JPanel();
                JPanel container1 = new JPanel();
                JPanel container2 = new JPanel();
                container.setLayout(new BoxLayout(container, BoxLayout.Y_AXIS));
                container1.setLayout(new BoxLayout(container1, BoxLayout.Y_AXIS));
                container2.setLayout(new BoxLayout(container2, BoxLayout.X_AXIS));


                container1.add(panel1);
                container2.add(container1);
                container2.add(panel3);
                container2.add(panel4);
                container.add(container2);
                container.add(panel2);

                {

                    for (int i=0; i<25; i++){

                        JPanel harnessPanel= new JPanel();
                        harnessPanel.setMinimumSize(new Dimension(1280, 70));
                        harnessPanel.setMaximumSize(new Dimension(1280, 70));
                        harnessPanel.setPreferredSize(new Dimension(1280, 70));
                        if(i%2==0) {
                            harnessPanel.setBackground(myBlue1Color);
                        }
                        else {
                            harnessPanel.setBackground(myBlue2Color);
                        }
                        panel2.add(harnessPanel);

                        harnessPanel.repaint();
                        harnessPanel.validate();
                    }
                    panel2.repaint();
                    panel2.validate();
                }
                jframe.add(scrollFrame);
                jframe.add(container);

                jframe.pack();
                jframe.setLocationRelativeTo(null);
                jframe.setVisible(true);

            }

            private JPanel createSquareJPanel(Color color, int size1, int size2)
            {
                JPanel tempPanel = new JPanel();
                tempPanel.setBackground(color);
                tempPanel.setMinimumSize(new Dimension(size1, size2));
                tempPanel.setMaximumSize(new Dimension(size1, size2));
                tempPanel.setPreferredSize(new Dimension(size1, size2));
                return tempPanel;
            }

            public static void main (String args[]){
                SwingUtilities.invokeLater(new Runnable() {
                    @Override
                    public void run() {
                        Form3 myF=new Form3();

                    }
                });
            };
        }

我的应用图片：

picture of my app:

实际状态：

actual state:

推荐答案

JFrame 默认情况下使用 BorderLayout 。它的默认位置（如果你没有指定）是 CENTER 。

JFrame uses a BorderLayout by default. It's default position (if you don't specify one) is CENTER.

BorderLayout 只允许一个组件占据其中任意一个5个可用位置。

BorderLayout will only allow one component to occupy any of it's 5 available positions.

所以当你这样做时......

So when you do...

jframe.add(scrollFrame);
jframe.add(container);

它将 scrollFrame 添加到中心位置并在添加容器时有效删除它（实际上并没有将其删除，但结果大致相同）。

It adds the scrollFrame to the center position and effectively removes it when you add container (it doesn't actually remove it, but the result is just about the same).

尝试提供位置约束。例如......

Try supplying a position constraint. For example...

jframe.add(scrollFrame);
jframe.add(container, BorderLayout.SOUTH);

参见如何使用BorderLayout 获取更多详细信息

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