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当我试图在框架上添加多个组件时,显示白色框

swing java

Sergei Podlipaev · 技术社区 · 6 年前

我正在开发JAVA Swing应用程序。我试图在主jframe上添加2个jpanel。

我的主要JPanel课程:

public class DrawingPanel extends JPanel {
    //mouse variables here
    //Point mPt = new Point(0,0);

    public DrawingPanel() {
        setBackground(COLOURBACK);
        MyMouseListener ml = new MyMouseListener();
        addMouseListener(ml);
    }

    public Dimension getPreferredSize() {
    return new Dimension(width, height);
    }
....
....
....
}

当我在主框架上添加为唯一组件时,工作正常。但当我试图在框架上添加另一个JPanel时,我的绘图面板显示为小的白色框。

private void createAndShowGUI()
    {
        DrawingPanel panel = new DrawingPanel();


        JFrame frame = new JFrame("Hex Testing 4");
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        Container content = frame.getContentPane();
        JPanel aggregationFrame = new JPanel(new GridBagLayout());
        aggregationFrame.add(panel);
        aggregationFrame.add(new JLabel("Enter username:"));
        content.add(aggregationFrame);
        //this.add(panel);  -- cannot be done in a static context
        //for hexes in the FLAT orientation, the height of a 10x10 grid is 1.1764 * the width. (from h / (s+t))
        frame.setSize( (int)(SCRSIZE/1.23), SCRSIZE);
        frame.setResizable(false);
        frame.setLocationRelativeTo( null );
        frame.setVisible(true);
    }

看起来像这样

我试图添加GETAPYRESSIZE()方法来绘制面板,正如建议的那样。 JPanel appears as a small white box 问题,但效果不好。

你能帮我解决这个问题吗?

更新:

我已经改变了布局,现在我看到了一半的JPanel。我认为问题与JPanel和Jframe的固定大小有关。会调查的。

2 回复 | 直到 6 年前

MadProgrammer 6 年前

所以,我把你的断章取义的代码,拼凑成一个可运行的变体…没有问题。这表明问题出在你没有告诉我们的代码中。与其发布不完整代码的“片段”(这会引发更多问题),不如发布 Minimal, Complete, and Verifiable example 可以编译和运行,这说明了你所面临的问题。

一个运行和工作的例子…

import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Test {

  public static void main(String[] args) {
    new Test();
  }

  public Test() {
    EventQueue.invokeLater(new Runnable() {
      @Override
      public void run() {
        DrawingPanel panel = new DrawingPanel();

        JFrame frame = new JFrame("Hex Testing 4");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container content = frame.getContentPane();
        JPanel aggregationFrame = new JPanel(new GridBagLayout());
        aggregationFrame.add(panel);
        aggregationFrame.add(new JLabel("Enter username:"));
        content.add(aggregationFrame);
        //this.add(panel);  -- cannot be done in a static context
        //for hexes in the FLAT orientation, the height of a 10x10 grid is 1.1764 * the width. (from h / (s+t))
        frame.pack();
        //frame.setResizable(false);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
      }
    });
  }

  public class DrawingPanel extends JPanel {
    //mouse variables here
    //Point mPt = new Point(0,0);

    private int width = 200;
    private int height = 200;

    public DrawingPanel() {
      setBackground(Color.BLACK);
//    MyMouseListener ml = new MyMouseListener();
//    addMouseListener(ml);
    }

    public Dimension getPreferredSize() {
      return new Dimension(width, height);
    }
  }

}

Sergei Podlipaev 6 年前

问题是我的组件大小。好像它没有安装在主框架上,被切断了。我设置了动态帧大小,现在它工作得很好。