我正在努力添加多个 JPanel 集装箱到单个集装箱 JScrollPane 在JavaSwing中。我想要的输出是在一个屏幕上的基本面板上有一个滚动窗格 JFrame ，并使滚动窗格包含2个面板，目前。
基本上，就像滚动窗格可以将其视图设置为单个面板一样，我希望将其设置为两个面板。
这些面板上唯一存在的东西是在上面绘制的图形，不是吗 JComponent 示例。我看过其他类似的链接：javaswing：如何将多个jpanel添加到jscrollpane，但我没有得到想要的输出。这是我的最新尝试，它只显示滚动窗格边缘，而面板不可见（最小可复制）：
import javax.swing.*;
import java.awt.*;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
JFrame frame = new JFrame("Test"); //initialize frame
frame.setSize(500, 500);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel base = new JPanel(); //make base panel with SpringLayout
SpringLayout baseLayout = new SpringLayout();
base.setLayout(baseLayout);
JPanel panel1 = new JPanel() { //initialize JPanels
public void paintComponent(Graphics tool) {
super.paintComponent(tool);
tool.drawRect(50, 50, 100, 100);
}
};
JPanel panel2 = new JPanel() {
public void paintComponent(Graphics tool) {
super.paintComponent(tool);
tool.drawRect(75, 75, 50, 50);
}
};
Container cont = new Container(); //create a container to hold panels
SpringLayout contLayout = new SpringLayout();
cont.setLayout(contLayout);
contLayout.putConstraint(SpringLayout.WEST, panel1, 0, SpringLayout.WEST, cont);
contLayout.putConstraint(SpringLayout.NORTH, panel1, 0, SpringLayout.NORTH, cont);
cont.add(panel1); //add panel1 to top left corner of container
contLayout.putConstraint(SpringLayout.WEST, panel2, 0, SpringLayout.WEST, cont);
contLayout.putConstraint(SpringLayout.NORTH, panel2, 0, SpringLayout.NORTH, cont);
cont.add(panel2); //add panel2 to top left corner of container
cont.setPreferredSize(new Dimension(201, 201));
JScrollPane scroll = new JScrollPane(cont); //add container to scroll pane
scroll.setPreferredSize(new Dimension(200, 200));
baseLayout.putConstraint(SpringLayout.HORIZONTAL_CENTER, scroll, 0, SpringLayout.HORIZONTAL_CENTER, base);
baseLayout.putConstraint(SpringLayout.VERTICAL_CENTER, scroll, 0, SpringLayout.VERTICAL_CENTER, base);
base.add(scroll); //add scroll pane to center of base JPanel
frame.add(base);
frame.setVisible(true);
}
}
1条答案
按热度按时间6za6bjd01#
好的，我做了更多的实验，添加了这几行，现在两个面板都正确地显示在jscrollpane中：
不知道它为什么会起作用，如果有人能解释的话，那就太好了。以下是工作代码：