动态添加 JPanel Swing

Question

您好，我想要以下用户界面：

当用户点击开始时，我想在这些元素下面动态添加JPanel。像这样的东西：

我能够在一个空的JFrame 中生成网格，但是当我尝试添加它时，当JFrame 中有更多元素时，它会出现，但非常小。

这是我尝试过的代码。 UITable 类创建按钮和输入文本

public UITable(){

    jfrm = new JFrame("Plants experiment");
    jfrm.setLayout(new FlowLayout());
    jfrm.setSize(1000, 1000);
    jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //JLabel titles for input texts
    JLabel jlab_plants = new JLabel(" Enter nº plants: ");
    JLabel jlab_time = new JLabel(" Enter evolution time: ");
    jlab_prueba = new JLabel("");

    //Input texts
    jtf_plants = new JTextField(10);
    jtf_plants.setActionCommand("numPlants");
    jtf_time = new JTextField(10);
    jtf_time.setActionCommand("time");

    //Buttons
    jbtnStart = new JButton("Start");

    //Add components
    jfrm.add(jlab_plants);
    jfrm.add(jtf_plants);
    jfrm.add(jlab_time);
    jfrm.add(jtf_time);
    jfrm.add(jbtnStart);
    jfrm.add(jlab_prueba);

    //Set visibility
    jfrm.setVisible(true);
}

动态添加网格：

@Override
public void actionPerformed(ActionEvent ae) {
    // ...
    this.view.jfrm.add(new Grid());
    this.view.jfrm.revalidate();
    this.view.jfrm.repaint();

}

这是 Grid 类：

public class Grid extends JPanel{
//Change Point to Plant in order to have a different color for each object
private List<Plant> fillCells;

public Grid() {
    //fillCells = new ArrayList<>(25);
    fillCells = PlantsControler.myPlants;
}

@Override
protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    System.out.println("Width: "+getWidth()+" Height: "+ getHeight());
----  //Returns Width: 10 Height: 10 ------
    g.clearRect(0, 0, getWidth(), getHeight());
    for (Plant fillCell : fillCells) {
        int cellX = 10 + (fillCell.getX() * 10);
        int cellY = 10 + (fillCell.getY() * 10);
        g.setColor(fillCell.getColor());
        g.fillRect(cellX, cellY, 10, 10);
    }
    g.setColor(Color.BLACK);
    g.drawRect(10, 10, 800, 500);

    for (int i = 10; i <= 800; i += 10) {
        g.drawLine(i, 10, i, 510);
    }

    for (int i = 10; i <= 500; i += 10) {
        g.drawLine(10, i, 810, i);
    }
}

public void fillCell(int x, int y, Color color) {
    fillCells.add(new Plant(x, y, color));
    repaint();
}

public void fillCell(Plant plant){
    fillCells.add(plant);
    repaint();
}
public void fillCell(){
    repaint();
}

public void clearGrid(){
    fillCells.clear();
}

提前致谢！！！

Answer 1

你可以试试下面的方法。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class DemoFrame extends JFrame {

    JTextField  field = new JTextField();

    public DemoFrame() {
        setLayout(new BorderLayout());
        JPanel controlsPane = new JPanel(new FlowLayout());
        controlsPane.add(new JLabel("I m a Label"));
        field.setPreferredSize(new Dimension(100,20));
        controlsPane.add(field);
        JButton button = new JButton("I am add drawPanel");
        controlsPane.add(button);
        button.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent paramActionEvent) {
                DemoFrame.this.add(new DrawPanel(), BorderLayout.CENTER);
                DemoFrame.this.revalidate();
            }
        });
        add(controlsPane,BorderLayout.NORTH);
    }

    public static void main(String[] args) {
        DemoFrame frame = new DemoFrame();
        frame.setVisible(true);
        frame.pack();
    }

    class DrawPanel extends JPanel {

        @Override
        protected void paintComponent(Graphics g) {
            // TODO Auto-generated method stub
            super.paintComponent(g);
            g.setColor(Color.BLUE);
            g.drawString(field.getText(), this.getWidth()/2, this.getHeight()/2);
        }
    }
}