Question

我正在开发一个项目，我要求在单击按钮时，GridBagLayer中的对象移动到不同的位置。到目前为止，这是我的代码：

    import java.awt.GridBagConstraints;
    import java.awt.GridBagLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;

    import javax.swing.ImageIcon;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;

    public class main extends JFrame{
    private JButton button,littlebutton;
    private JLabel holdred1,holdred2;
    private ImageIcon red1,red2;

public main(){
//sets the layout
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
//sets the button
button = new JButton("Button");
c.gridx = 0;
c.gridy = 0;
add(button,c);
//sets the image
red1 = new ImageIcon(getClass().getResource("/images/redtile.png"));
red2 = new ImageIcon(getClass().getResource("/images/redtile.png"));
//puts it in the JLabel
holdred1 = new JLabel(red1);
c.gridx = 0;
c.gridy = 0;
add(holdred1, c);
holdred2 = new JLabel(red2);
c.gridx = 1;
c.gridy = 0;
add(holdred2, c);
littlebutton = new JButton("Click Me");
c.gridx = 0;
c.gridy = 0;
add(littlebutton,c);

event e = new event();
littlebutton.addActionListener(e);
}

public class event implements ActionListener {
    public void actionPerformed(ActionEvent e){
        //code goes here


    }
}
public static void main(String args[]){
    //displaying the window
    main gui = new main();
    gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    gui.setSize(575,575);
    gui.setVisible(true);
    gui.setTitle("Change Spot");
}
}

我对Grid Bag Layouts没有多少经验，所以我不知道如何做到这一点，提前谢谢！

问题是如何让按钮将gridx更改为1

Answer 1

在GridBagConstraints中，您可以指定元素在网格中的位置。你已经在这部分代码

中完成了这项工作

c.gridx = 0;
c.gridy = 0;
add(holdred1, c);
holdred2 = new JLabel(red2);
c.gridx = 1;
c.gridy = 0;
add(holdred2, c);
littlebutton = new JButton("Click Me");
c.gridx = 0;
c.gridy = 0;

但是您要告诉布局使用c.gridx = 0, c.gridy = 0将多个组件放在同一个网格中。每个组件都应该有自己的单元格空间，因此它们不会重叠。

我编辑了你的代码：

 setLayout(new GridBagLayout());
            GridBagConstraints c = new GridBagConstraints();
//sets the button
            button = new JButton("Button");
            c.gridx = 2;
            c.gridy = 2;
            add(button, c);
//sets the image
//            red1 = new ImageIcon(getClass().getResource("/images/redtile.png"));
//            red2 = new ImageIcon(getClass().getResource("/images/redtile.png"));
//puts it in the JLabel
            holdred1 = new JLabel("Red1");
            c.gridx = 1;
            c.gridy = 1;
            add(holdred1, c);
            holdred2 = new JLabel("Red2");
            c.gridx = 1;
            c.gridy = 2;
            add(holdred2, c);
            littlebutton = new JButton("Click Me");
            c.gridx = 2;
            c.gridy = 1;
            add(littlebutton, c);

            event e = new event();
            littlebutton.addActionListener(e);

我认为您希望标签位于按钮顶部，因此我将它们放在一边，以便您可以练习它。

另一个简单的提示，如果您希望组件在表格中占用多个单元格，则必须使用c.weightx = someValue, c.weighty = someValue。

看看：How to use GridBagLayout。

在Java

1 个答案: