jpanel Java向ScrollPane中嵌入的面板添加JLabel

Question

JScrollPane scrollPane = new JScrollPane(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
scrollPane.setBounds(23, 11, 603, 123);

contentPane.add(scrollPane);

JPanel panel = new JPanel();
JLabel[] labels=new JLabel[callout.getRedCount()]; //callout.getRedCount() = 8
panel.setLayout(null);
int x = 50;
int y = 50;
for (int i=0;i<callout.getRedCount();i++){ //callout.getRedCount() = 8
        labels[i]=new JLabel("Red" + i);
        labels[i].setBounds(x, y, 32, 32);
        panel.add(labels[i]);
        x += 150;
}
scrollPane.setViewportView(panel);

我试图将这些标签添加到嵌入在scrollPane中的面板中。标签显示正确，但最后几个超过面板大小时除外。scrollPane不会滚动。我尝试了各种不同的布局，但仍然没有结果。我是否遗漏了一些关于如何做到这一点的信息

Answer 1

好的，我用GridBagLayout做了这个

public static void main(String args[]){

    JFrame contentPane = new JFrame();

    JScrollPane scrollPane = new JScrollPane(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
    scrollPane.setBounds(23, 11, 50, 50);

    contentPane.add(scrollPane);

    JPanel panel = new JPanel();
    JLabel[] labels=new JLabel[8]; //callout.getRedCount() = 8
    panel.setLayout(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.insets = new Insets(0,10,0,0);
    int x = 50;
    int y = 50;
    for (int i=0;i<8;i++){ //callout.getRedCount() = 8
            labels[i]=new JLabel("Red" + i);
            gbc.gridx = i;
            panel.add(labels[i], gbc);
    }
    scrollPane.setViewportView(panel);
    contentPane.setSize(50,50);
    contentPane.setVisible(true);

}

您可以改变周围的值，这是非常粗糙的。希望这有帮助